yaffs2: Make checkpoint block scanning skip bad blocks.
[yaffs2.git] / yaffs_guts.c
index d8ca648..df6cb00 100644 (file)
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2011 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
  * published by the Free Software Foundation.
  */
 
-const char *yaffs_guts_c_version =
-    "$Id: yaffs_guts.c,v 1.120 2010-03-15 23:10:34 charles Exp $";
-
 #include "yportenv.h"
 #include "yaffs_trace.h"
 
-#include "yaffsinterface.h"
 #include "yaffs_guts.h"
-#include "yaffs_tagsvalidity.h"
 #include "yaffs_getblockinfo.h"
-
 #include "yaffs_tagscompat.h"
-#ifndef CONFIG_YAFFS_USE_OWN_SORT
-#include "yaffs_qsort.h"
-#endif
 #include "yaffs_nand.h"
-
-#include "yaffs_checkptrw.h"
-
+#include "yaffs_yaffs1.h"
+#include "yaffs_yaffs2.h"
+#include "yaffs_bitmap.h"
+#include "yaffs_verify.h"
 #include "yaffs_nand.h"
 #include "yaffs_packedtags2.h"
+#include "yaffs_nameval.h"
+#include "yaffs_allocator.h"
+#include "yaffs_attribs.h"
+#include "yaffs_summary.h"
 
-
-#define YAFFS_PASSIVE_GC_CHUNKS 2
-#define YAFFS_SMALL_HOLE_THRESHOLD 3
+/* Note YAFFS_GC_GOOD_ENOUGH must be <= YAFFS_GC_PASSIVE_THRESHOLD */
+#define YAFFS_GC_GOOD_ENOUGH 2
+#define YAFFS_GC_PASSIVE_THRESHOLD 4
 
 #include "yaffs_ecc.h"
 
+/* Forward declarations */
 
-/* Robustification (if it ever comes about...) */
-static void yaffs_RetireBlock(yaffs_Device *dev, int blockInNAND);
-static void yaffs_HandleWriteChunkError(yaffs_Device *dev, int chunkInNAND,
-               int erasedOk);
-static void yaffs_HandleWriteChunkOk(yaffs_Device *dev, int chunkInNAND,
-                               const __u8 *data,
-                               const yaffs_ExtendedTags *tags);
-static void yaffs_HandleUpdateChunk(yaffs_Device *dev, int chunkInNAND,
-                               const yaffs_ExtendedTags *tags);
-
-/* Other local prototypes */
-static void yaffs_UpdateParent(yaffs_Object *obj);
-static int yaffs_UnlinkObject(yaffs_Object *obj);
-static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj);
-
-static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList);
-
-static int yaffs_WriteNewChunkWithTagsToNAND(yaffs_Device *dev,
-                                       const __u8 *buffer,
-                                       yaffs_ExtendedTags *tags,
-                                       int useReserve);
-static int yaffs_PutChunkIntoFile(yaffs_Object *in, int chunkInInode,
-                               int chunkInNAND, int inScan);
-
-static yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev, int number,
-                                       yaffs_ObjectType type);
-static void yaffs_AddObjectToDirectory(yaffs_Object *directory,
-                               yaffs_Object *obj);
-static int yaffs_UpdateObjectHeader(yaffs_Object *in, const YCHAR *name,
-                               int force, int isShrink, int shadows);
-static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj);
-static int yaffs_CheckStructures(void);
-static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level,
-                       int chunkOffset, int *limit);
-static int yaffs_DoGenericObjectDeletion(yaffs_Object *in);
-
-static yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device *dev, int blockNo);
-
-
-static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
-                               int chunkInNAND);
-
-static int yaffs_UnlinkWorker(yaffs_Object *obj);
-
-static int yaffs_TagsMatch(const yaffs_ExtendedTags *tags, int objectId,
-                       int chunkInObject);
-
-static int yaffs_AllocateChunk(yaffs_Device *dev, int useReserve,
-                               yaffs_BlockInfo **blockUsedPtr);
+static int yaffs_wr_data_obj(struct yaffs_obj *in, int inode_chunk,
+                            const u8 *buffer, int n_bytes, int use_reserve);
 
-static void yaffs_VerifyFreeChunks(yaffs_Device *dev);
 
-static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in);
-
-static void yaffs_VerifyDirectory(yaffs_Object *directory);
-#ifdef YAFFS_PARANOID
-static int yaffs_CheckFileSanity(yaffs_Object *in);
-#else
-#define yaffs_CheckFileSanity(in)
-#endif
-
-static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in);
-static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId);
-
-static void yaffs_InvalidateCheckpoint(yaffs_Device *dev);
-
-static int yaffs_FindChunkInFile(yaffs_Object *in, int chunkInInode,
-                               yaffs_ExtendedTags *tags);
-
-static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn,
-               unsigned pos);
-static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev,
-                                       yaffs_FileStructure *fStruct,
-                                       __u32 chunkId);
-
-static int yaffs_HandleHole(yaffs_Object *obj, loff_t newSize);
-static void yaffs_SkipRestOfBlock(yaffs_Device *dev);
-static int yaffs_VerifyChunkWritten(yaffs_Device *dev,
-                                       int chunkInNAND,
-                                       const __u8 *data,
-                                       yaffs_ExtendedTags *tags);
 
 /* Function to calculate chunk and offset */
 
-static void yaffs_AddrToChunk(yaffs_Device *dev, loff_t addr, int *chunkOut,
-               __u32 *offsetOut)
+void yaffs_addr_to_chunk(struct yaffs_dev *dev, loff_t addr,
+                               int *chunk_out, u32 *offset_out)
 {
        int chunk;
-       __u32 offset;
+       u32 offset;
 
-       chunk  = (__u32)(addr >> dev->chunkShift);
+       chunk = (u32) (addr >> dev->chunk_shift);
 
-       if (dev->chunkDiv == 1) {
+       if (dev->chunk_div == 1) {
                /* easy power of 2 case */
-               offset = (__u32)(addr & dev->chunkMask);
+               offset = (u32) (addr & dev->chunk_mask);
        } else {
                /* Non power-of-2 case */
 
-               loff_t chunkBase;
+               loff_t chunk_base;
 
-               chunk /= dev->chunkDiv;
+               chunk /= dev->chunk_div;
 
-               chunkBase = ((loff_t)chunk) * dev->nDataBytesPerChunk;
-               offset = (__u32)(addr - chunkBase);
+               chunk_base = ((loff_t) chunk) * dev->data_bytes_per_chunk;
+               offset = (u32) (addr - chunk_base);
        }
 
-       *chunkOut = chunk;
-       *offsetOut = offset;
+       *chunk_out = chunk;
+       *offset_out = offset;
 }
 
 /* Function to return the number of shifts for a power of 2 greater than or
@@ -156,129 +76,111 @@ static void yaffs_AddrToChunk(yaffs_Device *dev, loff_t addr, int *chunkOut,
  * be hellishly efficient.
  */
 
-static __u32 ShiftsGE(__u32 x)
+static inline u32 calc_shifts_ceiling(u32 x)
 {
-       int extraBits;
-       int nShifts;
+       int extra_bits;
+       int shifts;
 
-       nShifts = extraBits = 0;
+       shifts = extra_bits = 0;
 
        while (x > 1) {
                if (x & 1)
-                       extraBits++;
+                       extra_bits++;
                x >>= 1;
-               nShifts++;
+               shifts++;
        }
 
-       if (extraBits)
-               nShifts++;
+       if (extra_bits)
+               shifts++;
 
-       return nShifts;
+       return shifts;
 }
 
 /* Function to return the number of shifts to get a 1 in bit 0
  */
 
-static __u32 Shifts(__u32 x)
+static inline u32 calc_shifts(u32 x)
 {
-       int nShifts;
+       u32 shifts;
 
-       nShifts =  0;
+       shifts = 0;
 
        if (!x)
                return 0;
 
-       while (!(x&1)) {
+       while (!(x & 1)) {
                x >>= 1;
-               nShifts++;
+               shifts++;
        }
 
-       return nShifts;
+       return shifts;
 }
 
-
-
 /*
  * Temporary buffer manipulations.
  */
 
-static int yaffs_InitialiseTempBuffers(yaffs_Device *dev)
+static int yaffs_init_tmp_buffers(struct yaffs_dev *dev)
 {
        int i;
-       __u8 *buf = (__u8 *)1;
+       u8 *buf = (u8 *) 1;
 
-       memset(dev->tempBuffer, 0, sizeof(dev->tempBuffer));
+       memset(dev->temp_buffer, 0, sizeof(dev->temp_buffer));
 
        for (i = 0; buf && i < YAFFS_N_TEMP_BUFFERS; i++) {
-               dev->tempBuffer[i].line = 0;    /* not in use */
-               dev->tempBuffer[i].buffer = buf =
-                   YMALLOC_DMA(dev->param.totalBytesPerChunk);
+               dev->temp_buffer[i].in_use = 0;
+               buf = kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS);
+               dev->temp_buffer[i].buffer = buf;
        }
 
        return buf ? YAFFS_OK : YAFFS_FAIL;
 }
 
-__u8 *yaffs_GetTempBuffer(yaffs_Device *dev, int lineNo)
+u8 *yaffs_get_temp_buffer(struct yaffs_dev * dev)
 {
-       int i, j;
+       int i;
 
-       dev->tempInUse++;
-       if (dev->tempInUse > dev->maxTemp)
-               dev->maxTemp = dev->tempInUse;
+       dev->temp_in_use++;
+       if (dev->temp_in_use > dev->max_temp)
+               dev->max_temp = dev->temp_in_use;
 
        for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
-               if (dev->tempBuffer[i].line == 0) {
-                       dev->tempBuffer[i].line = lineNo;
-                       if ((i + 1) > dev->maxTemp) {
-                               dev->maxTemp = i + 1;
-                               for (j = 0; j <= i; j++)
-                                       dev->tempBuffer[j].maxLine =
-                                           dev->tempBuffer[j].line;
-                       }
-
-                       return dev->tempBuffer[i].buffer;
+               if (dev->temp_buffer[i].in_use == 0) {
+                       dev->temp_buffer[i].in_use = 1;
+                       return dev->temp_buffer[i].buffer;
                }
        }
 
-       T(YAFFS_TRACE_BUFFERS,
-         (TSTR("Out of temp buffers at line %d, other held by lines:"),
-          lineNo));
-       for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
-               T(YAFFS_TRACE_BUFFERS, (TSTR(" %d "), dev->tempBuffer[i].line));
-
-       T(YAFFS_TRACE_BUFFERS, (TSTR(" " TENDSTR)));
-
+       yaffs_trace(YAFFS_TRACE_BUFFERS, "Out of temp buffers");
        /*
         * If we got here then we have to allocate an unmanaged one
         * This is not good.
         */
 
-       dev->unmanagedTempAllocations++;
-       return YMALLOC(dev->nDataBytesPerChunk);
+       dev->unmanaged_buffer_allocs++;
+       return kmalloc(dev->data_bytes_per_chunk, GFP_NOFS);
 
 }
 
-void yaffs_ReleaseTempBuffer(yaffs_Device *dev, __u8 *buffer,
-                                   int lineNo)
+void yaffs_release_temp_buffer(struct yaffs_dev *dev, u8 *buffer)
 {
        int i;
 
-       dev->tempInUse--;
+       dev->temp_in_use--;
 
        for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
-               if (dev->tempBuffer[i].buffer == buffer) {
-                       dev->tempBuffer[i].line = 0;
+               if (dev->temp_buffer[i].buffer == buffer) {
+                       dev->temp_buffer[i].in_use = 0;
                        return;
                }
        }
 
        if (buffer) {
                /* assume it is an unmanaged one. */
-               T(YAFFS_TRACE_BUFFERS,
-                 (TSTR("Releasing unmanaged temp buffer in line %d" TENDSTR),
-                  lineNo));
-               YFREE(buffer);
-               dev->unmanagedTempDeallocations++;
+               yaffs_trace(YAFFS_TRACE_BUFFERS,
+                       "Releasing unmanaged temp buffer");
+               kfree(buffer);
+               dev->unmanaged_buffer_deallocs++;
        }
 
 }
@@ -286,7206 +188,4329 @@ void yaffs_ReleaseTempBuffer(yaffs_Device *dev, __u8 *buffer,
 /*
  * Determine if we have a managed buffer.
  */
-int yaffs_IsManagedTempBuffer(yaffs_Device *dev, const __u8 *buffer)
+int yaffs_is_managed_tmp_buffer(struct yaffs_dev *dev, const u8 *buffer)
 {
        int i;
 
        for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
-               if (dev->tempBuffer[i].buffer == buffer)
+               if (dev->temp_buffer[i].buffer == buffer)
                        return 1;
        }
 
-       for (i = 0; i < dev->param.nShortOpCaches; i++) {
-               if (dev->srCache[i].data == buffer)
+       for (i = 0; i < dev->param.n_caches; i++) {
+               if (dev->cache[i].data == buffer)
                        return 1;
        }
 
-       if (buffer == dev->checkpointBuffer)
+       if (buffer == dev->checkpt_buffer)
                return 1;
 
-       T(YAFFS_TRACE_ALWAYS,
-               (TSTR("yaffs: unmaged buffer detected.\n" TENDSTR)));
+       yaffs_trace(YAFFS_TRACE_ALWAYS,
+         "yaffs: unmaged buffer detected.");
        return 0;
 }
 
-
-
 /*
- * Chunk bitmap manipulations
+ * Functions for robustisizing TODO
+ *
  */
 
-static Y_INLINE __u8 *yaffs_BlockBits(yaffs_Device *dev, int blk)
+static void yaffs_handle_chunk_wr_ok(struct yaffs_dev *dev, int nand_chunk,
+                                    const u8 *data,
+                                    const struct yaffs_ext_tags *tags)
 {
-       if (blk < dev->internalStartBlock || blk > dev->internalEndBlock) {
-               T(YAFFS_TRACE_ERROR,
-                       (TSTR("**>> yaffs: BlockBits block %d is not valid" TENDSTR),
-                       blk));
-               YBUG();
-       }
-       return dev->chunkBits +
-               (dev->chunkBitmapStride * (blk - dev->internalStartBlock));
+       dev = dev;
+       nand_chunk = nand_chunk;
+       data = data;
+       tags = tags;
 }
 
-static Y_INLINE void yaffs_VerifyChunkBitId(yaffs_Device *dev, int blk, int chunk)
+static void yaffs_handle_chunk_update(struct yaffs_dev *dev, int nand_chunk,
+                                     const struct yaffs_ext_tags *tags)
 {
-       if (blk < dev->internalStartBlock || blk > dev->internalEndBlock ||
-                       chunk < 0 || chunk >= dev->param.nChunksPerBlock) {
-               T(YAFFS_TRACE_ERROR,
-               (TSTR("**>> yaffs: Chunk Id (%d:%d) invalid"TENDSTR),
-                       blk, chunk));
-               YBUG();
-       }
+       dev = dev;
+       nand_chunk = nand_chunk;
+       tags = tags;
 }
 
-static Y_INLINE void yaffs_ClearChunkBits(yaffs_Device *dev, int blk)
+void yaffs_handle_chunk_error(struct yaffs_dev *dev,
+                             struct yaffs_block_info *bi)
 {
-       __u8 *blkBits = yaffs_BlockBits(dev, blk);
+       if (!bi->gc_prioritise) {
+               bi->gc_prioritise = 1;
+               dev->has_pending_prioritised_gc = 1;
+               bi->chunk_error_strikes++;
+
+               if (bi->chunk_error_strikes > 3) {
+                       bi->needs_retiring = 1; /* Too many stikes, so retire */
+                       yaffs_trace(YAFFS_TRACE_ALWAYS,
+                               "yaffs: Block struck out");
 
-       memset(blkBits, 0, dev->chunkBitmapStride);
+               }
+       }
 }
 
-static Y_INLINE void yaffs_ClearChunkBit(yaffs_Device *dev, int blk, int chunk)
+static void yaffs_handle_chunk_wr_error(struct yaffs_dev *dev, int nand_chunk,
+                                       int erased_ok)
 {
-       __u8 *blkBits = yaffs_BlockBits(dev, blk);
+       int flash_block = nand_chunk / dev->param.chunks_per_block;
+       struct yaffs_block_info *bi = yaffs_get_block_info(dev, flash_block);
 
-       yaffs_VerifyChunkBitId(dev, blk, chunk);
+       yaffs_handle_chunk_error(dev, bi);
 
-       blkBits[chunk / 8] &= ~(1 << (chunk & 7));
-}
+       if (erased_ok) {
+               /* Was an actual write failure,
+                * so mark the block for retirement.*/
+               bi->needs_retiring = 1;
+               yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
+                 "**>> Block %d needs retiring", flash_block);
+       }
 
-static Y_INLINE void yaffs_SetChunkBit(yaffs_Device *dev, int blk, int chunk)
-{
-       __u8 *blkBits = yaffs_BlockBits(dev, blk);
+       /* Delete the chunk */
+       yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
+       yaffs_skip_rest_of_block(dev);
+}
 
-       yaffs_VerifyChunkBitId(dev, blk, chunk);
+/*
+ * Verification code
+ */
 
-       blkBits[chunk / 8] |= (1 << (chunk & 7));
-}
+/*
+ *  Simple hash function. Needs to have a reasonable spread
+ */
 
-static Y_INLINE int yaffs_CheckChunkBit(yaffs_Device *dev, int blk, int chunk)
+static inline int yaffs_hash_fn(int n)
 {
-       __u8 *blkBits = yaffs_BlockBits(dev, blk);
-       yaffs_VerifyChunkBitId(dev, blk, chunk);
-
-       return (blkBits[chunk / 8] & (1 << (chunk & 7))) ? 1 : 0;
+       if (n < 0)
+               n = -n;
+       return n % YAFFS_NOBJECT_BUCKETS;
 }
 
-static Y_INLINE int yaffs_StillSomeChunkBits(yaffs_Device *dev, int blk)
+/*
+ * Access functions to useful fake objects.
+ * Note that root might have a presence in NAND if permissions are set.
+ */
+
+struct yaffs_obj *yaffs_root(struct yaffs_dev *dev)
 {
-       __u8 *blkBits = yaffs_BlockBits(dev, blk);
-       int i;
-       for (i = 0; i < dev->chunkBitmapStride; i++) {
-               if (*blkBits)
-                       return 1;
-               blkBits++;
-       }
-       return 0;
+       return dev->root_dir;
 }
 
-static int yaffs_CountChunkBits(yaffs_Device *dev, int blk)
+struct yaffs_obj *yaffs_lost_n_found(struct yaffs_dev *dev)
 {
-       __u8 *blkBits = yaffs_BlockBits(dev, blk);
-       int i;
-       int n = 0;
-       for (i = 0; i < dev->chunkBitmapStride; i++) {
-               __u8 x = *blkBits;
-               while (x) {
-                       if (x & 1)
-                               n++;
-                       x >>= 1;
-               }
-
-               blkBits++;
-       }
-       return n;
+       return dev->lost_n_found;
 }
 
 /*
- * Verification code
+ *  Erased NAND checking functions
  */
 
-static int yaffs_SkipVerification(yaffs_Device *dev)
+int yaffs_check_ff(u8 *buffer, int n_bytes)
 {
-       dev=dev;
-       return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY | YAFFS_TRACE_VERIFY_FULL));
+       /* Horrible, slow implementation */
+       while (n_bytes--) {
+               if (*buffer != 0xff)
+                       return 0;
+               buffer++;
+       }
+       return 1;
 }
 
-static int yaffs_SkipFullVerification(yaffs_Device *dev)
+static int yaffs_check_chunk_erased(struct yaffs_dev *dev, int nand_chunk)
 {
-       dev=dev;
-       return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_FULL));
+       int retval = YAFFS_OK;
+       u8 *data = yaffs_get_temp_buffer(dev);
+       struct yaffs_ext_tags tags;
+       int result;
+
+       result = yaffs_rd_chunk_tags_nand(dev, nand_chunk, data, &tags);
+
+       if (tags.ecc_result > YAFFS_ECC_RESULT_NO_ERROR)
+               retval = YAFFS_FAIL;
+
+       if (!yaffs_check_ff(data, dev->data_bytes_per_chunk) ||
+               tags.chunk_used) {
+               yaffs_trace(YAFFS_TRACE_NANDACCESS,
+                       "Chunk %d not erased", nand_chunk);
+               retval = YAFFS_FAIL;
+       }
+
+       yaffs_release_temp_buffer(dev, data);
+
+       return retval;
+
 }
 
-static int yaffs_SkipNANDVerification(yaffs_Device *dev)
+static int yaffs_verify_chunk_written(struct yaffs_dev *dev,
+                                     int nand_chunk,
+                                     const u8 *data,
+                                     struct yaffs_ext_tags *tags)
 {
-       dev=dev;
-       return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_NAND));
+       int retval = YAFFS_OK;
+       struct yaffs_ext_tags temp_tags;
+       u8 *buffer = yaffs_get_temp_buffer(dev);
+       int result;
+
+       result = yaffs_rd_chunk_tags_nand(dev, nand_chunk, buffer, &temp_tags);
+       if (memcmp(buffer, data, dev->data_bytes_per_chunk) ||
+           temp_tags.obj_id != tags->obj_id ||
+           temp_tags.chunk_id != tags->chunk_id ||
+           temp_tags.n_bytes != tags->n_bytes)
+               retval = YAFFS_FAIL;
+
+       yaffs_release_temp_buffer(dev, buffer);
+
+       return retval;
 }
 
-static const char *blockStateName[] = {
-"Unknown",
-"Needs scanning",
-"Scanning",
-"Empty",
-"Allocating",
-"Full",
-"Dirty",
-"Checkpoint",
-"Collecting",
-"Dead"
-};
 
-static void yaffs_VerifyBlock(yaffs_Device *dev, yaffs_BlockInfo *bi, int n)
+int yaffs_check_alloc_available(struct yaffs_dev *dev, int n_chunks)
 {
-       int actuallyUsed;
-       int inUse;
+       int reserved_chunks;
+       int reserved_blocks = dev->param.n_reserved_blocks;
+       int checkpt_blocks;
 
-       if (yaffs_SkipVerification(dev))
-               return;
+       checkpt_blocks = yaffs_calc_checkpt_blocks_required(dev);
 
-       /* Report illegal runtime states */
-       if (bi->blockState >= YAFFS_NUMBER_OF_BLOCK_STATES)
-               T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has undefined state %d"TENDSTR), n, bi->blockState));
+       reserved_chunks =
+           (reserved_blocks + checkpt_blocks) * dev->param.chunks_per_block;
 
-       switch (bi->blockState) {
-       case YAFFS_BLOCK_STATE_UNKNOWN:
-       case YAFFS_BLOCK_STATE_SCANNING:
-       case YAFFS_BLOCK_STATE_NEEDS_SCANNING:
-               T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has bad run-state %s"TENDSTR),
-               n, blockStateName[bi->blockState]));
-       }
+       return (dev->n_free_chunks > (reserved_chunks + n_chunks));
+}
+
+static int yaffs_find_alloc_block(struct yaffs_dev *dev)
+{
+       int i;
+       struct yaffs_block_info *bi;
+
+       if (dev->n_erased_blocks < 1) {
+               /* Hoosterman we've got a problem.
+                * Can't get space to gc
+                */
+               yaffs_trace(YAFFS_TRACE_ERROR,
+                 "yaffs tragedy: no more erased blocks");
 
-       /* Check pages in use and soft deletions are legal */
+               return -1;
+       }
 
-       actuallyUsed = bi->pagesInUse - bi->softDeletions;
+       /* Find an empty block. */
 
-       if (bi->pagesInUse < 0 || bi->pagesInUse > dev->param.nChunksPerBlock ||
-          bi->softDeletions < 0 || bi->softDeletions > dev->param.nChunksPerBlock ||
-          actuallyUsed < 0 || actuallyUsed > dev->param.nChunksPerBlock)
-               T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has illegal values pagesInUsed %d softDeletions %d"TENDSTR),
-               n, bi->pagesInUse, bi->softDeletions));
+       for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
+               dev->alloc_block_finder++;
+               if (dev->alloc_block_finder < dev->internal_start_block
+                   || dev->alloc_block_finder > dev->internal_end_block) {
+                       dev->alloc_block_finder = dev->internal_start_block;
+               }
 
+               bi = yaffs_get_block_info(dev, dev->alloc_block_finder);
+
+               if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) {
+                       bi->block_state = YAFFS_BLOCK_STATE_ALLOCATING;
+                       dev->seq_number++;
+                       bi->seq_number = dev->seq_number;
+                       dev->n_erased_blocks--;
+                       yaffs_trace(YAFFS_TRACE_ALLOCATE,
+                         "Allocated block %d, seq  %d, %d left" ,
+                          dev->alloc_block_finder, dev->seq_number,
+                          dev->n_erased_blocks);
+                       return dev->alloc_block_finder;
+               }
+       }
 
-       /* Check chunk bitmap legal */
-       inUse = yaffs_CountChunkBits(dev, n);
-       if (inUse != bi->pagesInUse)
-               T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has inconsistent values pagesInUse %d counted chunk bits %d"TENDSTR),
-                       n, bi->pagesInUse, inUse));
+       yaffs_trace(YAFFS_TRACE_ALWAYS,
+               "yaffs tragedy: no more erased blocks, but there should have been %d",
+               dev->n_erased_blocks);
 
-       /* Check that the sequence number is valid.
-        * Ten million is legal, but is very unlikely
-        */
-       if (dev->param.isYaffs2 &&
-          (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING || bi->blockState == YAFFS_BLOCK_STATE_FULL) &&
-          (bi->sequenceNumber < YAFFS_LOWEST_SEQUENCE_NUMBER || bi->sequenceNumber > 10000000))
-               T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has suspect sequence number of %d"TENDSTR),
-               n, bi->sequenceNumber));
+       return -1;
 }
 
-static void yaffs_VerifyCollectedBlock(yaffs_Device *dev, yaffs_BlockInfo *bi,
-               int n)
+static int yaffs_alloc_chunk(struct yaffs_dev *dev, int use_reserver,
+                            struct yaffs_block_info **block_ptr)
 {
-       yaffs_VerifyBlock(dev, bi, n);
+       int ret_val;
+       struct yaffs_block_info *bi;
 
-       /* After collection the block should be in the erased state */
-       /* This will need to change if we do partial gc */
+       if (dev->alloc_block < 0) {
+               /* Get next block to allocate off */
+               dev->alloc_block = yaffs_find_alloc_block(dev);
+               dev->alloc_page = 0;
+       }
 
-       if (bi->blockState != YAFFS_BLOCK_STATE_COLLECTING &&
-                       bi->blockState != YAFFS_BLOCK_STATE_EMPTY) {
-               T(YAFFS_TRACE_ERROR, (TSTR("Block %d is in state %d after gc, should be erased"TENDSTR),
-                       n, bi->blockState));
+       if (!use_reserver && !yaffs_check_alloc_available(dev, 1)) {
+               /* No space unless we're allowed to use the reserve. */
+               return -1;
        }
-}
 
-static void yaffs_VerifyBlocks(yaffs_Device *dev)
-{
-       int i;
-       int nBlocksPerState[YAFFS_NUMBER_OF_BLOCK_STATES];
-       int nIllegalBlockStates = 0;
+       if (dev->n_erased_blocks < dev->param.n_reserved_blocks
+           && dev->alloc_page == 0)
+               yaffs_trace(YAFFS_TRACE_ALLOCATE, "Allocating reserve");
 
-       if (yaffs_SkipVerification(dev))
-               return;
+       /* Next page please.... */
+       if (dev->alloc_block >= 0) {
+               bi = yaffs_get_block_info(dev, dev->alloc_block);
 
-       memset(nBlocksPerState, 0, sizeof(nBlocksPerState));
+               ret_val = (dev->alloc_block * dev->param.chunks_per_block) +
+                   dev->alloc_page;
+               bi->pages_in_use++;
+               yaffs_set_chunk_bit(dev, dev->alloc_block, dev->alloc_page);
 
-       for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
-               yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, i);
-               yaffs_VerifyBlock(dev, bi, i);
+               dev->alloc_page++;
 
-               if (bi->blockState < YAFFS_NUMBER_OF_BLOCK_STATES)
-                       nBlocksPerState[bi->blockState]++;
-               else
-                       nIllegalBlockStates++;
-       }
+               dev->n_free_chunks--;
+
+               /* If the block is full set the state to full */
+               if (dev->alloc_page >= dev->param.chunks_per_block) {
+                       bi->block_state = YAFFS_BLOCK_STATE_FULL;
+                       dev->alloc_block = -1;
+               }
+
+               if (block_ptr)
+                       *block_ptr = bi;
 
-       T(YAFFS_TRACE_VERIFY, (TSTR(""TENDSTR)));
-       T(YAFFS_TRACE_VERIFY, (TSTR("Block summary"TENDSTR)));
+               return ret_val;
+       }
 
-       T(YAFFS_TRACE_VERIFY, (TSTR("%d blocks have illegal states"TENDSTR), nIllegalBlockStates));
-       if (nBlocksPerState[YAFFS_BLOCK_STATE_ALLOCATING] > 1)
-               T(YAFFS_TRACE_VERIFY, (TSTR("Too many allocating blocks"TENDSTR)));
+       yaffs_trace(YAFFS_TRACE_ERROR,
+               "!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!");
 
-       for (i = 0; i < YAFFS_NUMBER_OF_BLOCK_STATES; i++)
-               T(YAFFS_TRACE_VERIFY,
-                 (TSTR("%s %d blocks"TENDSTR),
-                 blockStateName[i], nBlocksPerState[i]));
+       return -1;
+}
 
-       if (dev->blocksInCheckpoint != nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT])
-               T(YAFFS_TRACE_VERIFY,
-                (TSTR("Checkpoint block count wrong dev %d count %d"TENDSTR),
-                dev->blocksInCheckpoint, nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT]));
+static int yaffs_get_erased_chunks(struct yaffs_dev *dev)
+{
+       int n;
 
-       if (dev->nErasedBlocks != nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY])
-               T(YAFFS_TRACE_VERIFY,
-                (TSTR("Erased block count wrong dev %d count %d"TENDSTR),
-                dev->nErasedBlocks, nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY]));
+       n = dev->n_erased_blocks * dev->param.chunks_per_block;
 
-       if (nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING] > 1)
-               T(YAFFS_TRACE_VERIFY,
-                (TSTR("Too many collecting blocks %d (max is 1)"TENDSTR),
-                nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING]));
+       if (dev->alloc_block > 0)
+               n += (dev->param.chunks_per_block - dev->alloc_page);
 
-       T(YAFFS_TRACE_VERIFY, (TSTR(""TENDSTR)));
+       return n;
 
 }
 
 /*
- * Verify the object header. oh must be valid, but obj and tags may be NULL in which
- * case those tests will not be performed.
+ * yaffs_skip_rest_of_block() skips over the rest of the allocation block
+ * if we don't want to write to it.
  */
-static void yaffs_VerifyObjectHeader(yaffs_Object *obj, yaffs_ObjectHeader *oh, yaffs_ExtendedTags *tags, int parentCheck)
+void yaffs_skip_rest_of_block(struct yaffs_dev *dev)
 {
-       if (obj && yaffs_SkipVerification(obj->myDev))
-               return;
+       struct yaffs_block_info *bi;
 
-       if (!(tags && obj && oh)) {
-               T(YAFFS_TRACE_VERIFY,
-                               (TSTR("Verifying object header tags %p obj %p oh %p"TENDSTR),
-                               tags, obj, oh));
-               return;
+       if (dev->alloc_block > 0) {
+               bi = yaffs_get_block_info(dev, dev->alloc_block);
+               if (bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING) {
+                       bi->block_state = YAFFS_BLOCK_STATE_FULL;
+                       dev->alloc_block = -1;
+               }
        }
+}
 
-       if (oh->type <= YAFFS_OBJECT_TYPE_UNKNOWN ||
-                       oh->type > YAFFS_OBJECT_TYPE_MAX)
-               T(YAFFS_TRACE_VERIFY,
-                       (TSTR("Obj %d header type is illegal value 0x%x"TENDSTR),
-                       tags->objectId, oh->type));
-
-       if (tags->objectId != obj->objectId)
-               T(YAFFS_TRACE_VERIFY,
-                       (TSTR("Obj %d header mismatch objectId %d"TENDSTR),
-                       tags->objectId, obj->objectId));
-
-
-       /*
-        * Check that the object's parent ids match if parentCheck requested.
-        *
-        * Tests do not apply to the root object.
-        */
+static int yaffs_write_new_chunk(struct yaffs_dev *dev,
+                                const u8 *data,
+                                struct yaffs_ext_tags *tags, int use_reserver)
+{
+       int attempts = 0;
+       int write_ok = 0;
+       int chunk;
 
-       if (parentCheck && tags->objectId > 1 && !obj->parent)
-               T(YAFFS_TRACE_VERIFY,
-                       (TSTR("Obj %d header mismatch parentId %d obj->parent is NULL"TENDSTR),
-                       tags->objectId, oh->parentObjectId));
+       yaffs2_checkpt_invalidate(dev);
 
-       if (parentCheck && obj->parent &&
-                       oh->parentObjectId != obj->parent->objectId &&
-                       (oh->parentObjectId != YAFFS_OBJECTID_UNLINKED ||
-                       obj->parent->objectId != YAFFS_OBJECTID_DELETED))
-               T(YAFFS_TRACE_VERIFY,
-                       (TSTR("Obj %d header mismatch parentId %d parentObjectId %d"TENDSTR),
-                       tags->objectId, oh->parentObjectId, obj->parent->objectId));
+       do {
+               struct yaffs_block_info *bi = 0;
+               int erased_ok = 0;
 
-       if (tags->objectId > 1 && oh->name[0] == 0) /* Null name */
-               T(YAFFS_TRACE_VERIFY,
-                       (TSTR("Obj %d header name is NULL"TENDSTR),
-                       obj->objectId));
+               chunk = yaffs_alloc_chunk(dev, use_reserver, &bi);
+               if (chunk < 0) {
+                       /* no space */
+                       break;
+               }
 
-       if (tags->objectId > 1 && ((__u8)(oh->name[0])) == 0xff) /* Trashed name */
-               T(YAFFS_TRACE_VERIFY,
-                       (TSTR("Obj %d header name is 0xFF"TENDSTR),
-                       obj->objectId));
-}
+               /* First check this chunk is erased, if it needs
+                * checking.  The checking policy (unless forced
+                * always on) is as follows:
+                *
+                * Check the first page we try to write in a block.
+                * If the check passes then we don't need to check any
+                * more.        If the check fails, we check again...
+                * If the block has been erased, we don't need to check.
+                *
+                * However, if the block has been prioritised for gc,
+                * then we think there might be something odd about
+                * this block and stop using it.
+                *
+                * Rationale: We should only ever see chunks that have
+                * not been erased if there was a partially written
+                * chunk due to power loss.  This checking policy should
+                * catch that case with very few checks and thus save a
+                * lot of checks that are most likely not needed.
+                *
+                * Mods to the above
+                * If an erase check fails or the write fails we skip the
+                * rest of the block.
+                */
 
+               /* let's give it a try */
+               attempts++;
 
+               if (dev->param.always_check_erased)
+                       bi->skip_erased_check = 0;
 
-static int yaffs_VerifyTnodeWorker(yaffs_Object *obj, yaffs_Tnode *tn,
-                                       __u32 level, int chunkOffset)
-{
-       int i;
-       yaffs_Device *dev = obj->myDev;
-       int ok = 1;
+               if (!bi->skip_erased_check) {
+                       erased_ok = yaffs_check_chunk_erased(dev, chunk);
+                       if (erased_ok != YAFFS_OK) {
+                               yaffs_trace(YAFFS_TRACE_ERROR,
+                                 "**>> yaffs chunk %d was not erased",
+                                 chunk);
 
-       if (tn) {
-               if (level > 0) {
-
-                       for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++) {
-                               if (tn->internal[i]) {
-                                       ok = yaffs_VerifyTnodeWorker(obj,
-                                                       tn->internal[i],
-                                                       level - 1,
-                                                       (chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
-                               }
-                       }
-               } else if (level == 0) {
-                       yaffs_ExtendedTags tags;
-                       __u32 objectId = obj->objectId;
-
-                       chunkOffset <<=  YAFFS_TNODES_LEVEL0_BITS;
-
-                       for (i = 0; i < YAFFS_NTNODES_LEVEL0; i++) {
-                               __u32 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
-
-                               if (theChunk > 0) {
-                                       /* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),tags.objectId,tags.chunkId,theChunk)); */
-                                       yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL, &tags);
-                                       if (tags.objectId != objectId || tags.chunkId != chunkOffset) {
-                                               T(~0, (TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
-                                                       objectId, chunkOffset, theChunk,
-                                                       tags.objectId, tags.chunkId));
-                                       }
-                               }
-                               chunkOffset++;
+                               /* If not erased, delete this one,
+                                * skip rest of block and
+                                * try another chunk */
+                               yaffs_chunk_del(dev, chunk, 1, __LINE__);
+                               yaffs_skip_rest_of_block(dev);
+                               continue;
                        }
                }
-       }
 
-       return ok;
+               write_ok = yaffs_wr_chunk_tags_nand(dev, chunk, data, tags);
 
-}
+               if (!bi->skip_erased_check)
+                       write_ok =
+                           yaffs_verify_chunk_written(dev, chunk, data, tags);
 
+               if (write_ok != YAFFS_OK) {
+                       /* Clean up aborted write, skip to next block and
+                        * try another chunk */
+                       yaffs_handle_chunk_wr_error(dev, chunk, erased_ok);
+                       continue;
+               }
 
-static void yaffs_VerifyFile(yaffs_Object *obj)
-{
-       int requiredTallness;
-       int actualTallness;
-       __u32 lastChunk;
-       __u32 x;
-       __u32 i;
-       yaffs_Device *dev;
-       yaffs_ExtendedTags tags;
-       yaffs_Tnode *tn;
-       __u32 objectId;
+               bi->skip_erased_check = 1;
 
-       if (!obj)
-               return;
+               /* Copy the data into the robustification buffer */
+               yaffs_handle_chunk_wr_ok(dev, chunk, data, tags);
 
-       if (yaffs_SkipVerification(obj->myDev))
-               return;
+       } while (write_ok != YAFFS_OK &&
+                (yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts));
 
-       dev = obj->myDev;
-       objectId = obj->objectId;
+       if (!write_ok)
+               chunk = -1;
 
-       /* Check file size is consistent with tnode depth */
-       lastChunk =  obj->variant.fileVariant.fileSize / dev->nDataBytesPerChunk + 1;
-       x = lastChunk >> YAFFS_TNODES_LEVEL0_BITS;
-       requiredTallness = 0;
-       while (x > 0) {
-               x >>= YAFFS_TNODES_INTERNAL_BITS;
-               requiredTallness++;
+       if (attempts > 1) {
+               yaffs_trace(YAFFS_TRACE_ERROR,
+                       "**>> yaffs write required %d attempts",
+                       attempts);
+               dev->n_retried_writes += (attempts - 1);
        }
 
-       actualTallness = obj->variant.fileVariant.topLevel;
+       return chunk;
+}
 
-       /* Check that the chunks in the tnode tree are all correct.
-        * We do this by scanning through the tnode tree and
-        * checking the tags for every chunk match.
-        */
+/*
+ * Block retiring for handling a broken block.
+ */
 
-       if (yaffs_SkipNANDVerification(dev))
-               return;
+static void yaffs_retire_block(struct yaffs_dev *dev, int flash_block)
+{
+       struct yaffs_block_info *bi = yaffs_get_block_info(dev, flash_block);
 
-       for (i = 1; i <= lastChunk; i++) {
-               tn = yaffs_FindLevel0Tnode(dev, &obj->variant.fileVariant, i);
-
-               if (tn) {
-                       __u32 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
-                       if (theChunk > 0) {
-                               /* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),objectId,i,theChunk)); */
-                               yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL, &tags);
-                               if (tags.objectId != objectId || tags.chunkId != i) {
-                                       T(~0, (TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
-                                               objectId, i, theChunk,
-                                               tags.objectId, tags.chunkId));
-                               }
-                       }
+       yaffs2_checkpt_invalidate(dev);
+
+       yaffs2_clear_oldest_dirty_seq(dev, bi);
+
+       if (yaffs_mark_bad(dev, flash_block) != YAFFS_OK) {
+               if (yaffs_erase_block(dev, flash_block) != YAFFS_OK) {
+                       yaffs_trace(YAFFS_TRACE_ALWAYS,
+                               "yaffs: Failed to mark bad and erase block %d",
+                               flash_block);
+               } else {
+                       struct yaffs_ext_tags tags;
+                       int chunk_id =
+                           flash_block * dev->param.chunks_per_block;
+
+                       u8 *buffer = yaffs_get_temp_buffer(dev);
+
+                       memset(buffer, 0xff, dev->data_bytes_per_chunk);
+                       memset(&tags, 0, sizeof(tags));
+                       tags.seq_number = YAFFS_SEQUENCE_BAD_BLOCK;
+                       if (dev->param.write_chunk_tags_fn(dev, chunk_id -
+                                                          dev->chunk_offset,
+                                                          buffer,
+                                                          &tags) != YAFFS_OK)
+                               yaffs_trace(YAFFS_TRACE_ALWAYS,
+                                       "yaffs: Failed to write bad block marker to block %d",
+                                       flash_block);
+
+                       yaffs_release_temp_buffer(dev, buffer);
                }
        }
+
+       bi->block_state = YAFFS_BLOCK_STATE_DEAD;
+       bi->gc_prioritise = 0;
+       bi->needs_retiring = 0;
+
+       dev->n_retired_blocks++;
 }
 
+/*---------------- Name handling functions ------------*/
 
-static void yaffs_VerifyHardLink(yaffs_Object *obj)
+static u16 yaffs_calc_name_sum(const YCHAR *name)
 {
-       if (obj && yaffs_SkipVerification(obj->myDev))
-               return;
+       u16 sum = 0;
+       u16 i = 1;
+
+       if (!name)
+               return 0;
 
-       /* Verify sane equivalent object */
+       while ((*name) && i < (YAFFS_MAX_NAME_LENGTH / 2)) {
+
+               /* 0x1f mask is case insensitive */
+               sum += ((*name) & 0x1f) * i;
+               i++;
+               name++;
+       }
+       return sum;
 }
 
-static void yaffs_VerifySymlink(yaffs_Object *obj)
+void yaffs_set_obj_name(struct yaffs_obj *obj, const YCHAR * name)
 {
-       if (obj && yaffs_SkipVerification(obj->myDev))
-               return;
+       memset(obj->short_name, 0, sizeof(obj->short_name));
+       if (name &&
+               strnlen(name, YAFFS_SHORT_NAME_LENGTH + 1) <=
+               YAFFS_SHORT_NAME_LENGTH)
+               strcpy(obj->short_name, name);
+       else
+               obj->short_name[0] = _Y('\0');
+       obj->sum = yaffs_calc_name_sum(name);
+}
 
-       /* Verify symlink string */
+void yaffs_set_obj_name_from_oh(struct yaffs_obj *obj,
+                               const struct yaffs_obj_hdr *oh)
+{
+#ifdef CONFIG_YAFFS_AUTO_UNICODE
+       YCHAR tmp_name[YAFFS_MAX_NAME_LENGTH + 1];
+       memset(tmp_name, 0, sizeof(tmp_name));
+       yaffs_load_name_from_oh(obj->my_dev, tmp_name, oh->name,
+                               YAFFS_MAX_NAME_LENGTH + 1);
+       yaffs_set_obj_name(obj, tmp_name);
+#else
+       yaffs_set_obj_name(obj, oh->name);
+#endif
 }
 
-static void yaffs_VerifySpecial(yaffs_Object *obj)
+loff_t yaffs_max_file_size(struct yaffs_dev *dev)
 {
-       if (obj && yaffs_SkipVerification(obj->myDev))
-               return;
+       return ((loff_t) YAFFS_MAX_CHUNK_ID) * dev->data_bytes_per_chunk;
 }
 
-static void yaffs_VerifyObject(yaffs_Object *obj)
+/*-------------------- TNODES -------------------
+
+ * List of spare tnodes
+ * The list is hooked together using the first pointer
+ * in the tnode.
+ */
+
+struct yaffs_tnode *yaffs_get_tnode(struct yaffs_dev *dev)
 {
-       yaffs_Device *dev;
+       struct yaffs_tnode *tn = yaffs_alloc_raw_tnode(dev);
 
-       __u32 chunkMin;
-       __u32 chunkMax;
+       if (tn) {
+               memset(tn, 0, dev->tnode_size);
+               dev->n_tnodes++;
+       }
 
-       __u32 chunkIdOk;
-       __u32 chunkInRange;
-       __u32 chunkShouldNotBeDeleted;
-       __u32 chunkValid;
+       dev->checkpoint_blocks_required = 0;    /* force recalculation */
 
-       if (!obj)
-               return;
+       return tn;
+}
 
-       if (obj->beingCreated)
-               return;
+/* FreeTnode frees up a tnode and puts it back on the free list */
+static void yaffs_free_tnode(struct yaffs_dev *dev, struct yaffs_tnode *tn)
+{
+       yaffs_free_raw_tnode(dev, tn);
+       dev->n_tnodes--;
+       dev->checkpoint_blocks_required = 0;    /* force recalculation */
+}
+
+static void yaffs_deinit_tnodes_and_objs(struct yaffs_dev *dev)
+{
+       yaffs_deinit_raw_tnodes_and_objs(dev);
+       dev->n_obj = 0;
+       dev->n_tnodes = 0;
+}
 
-       dev = obj->myDev;
+void yaffs_load_tnode_0(struct yaffs_dev *dev, struct yaffs_tnode *tn,
+                       unsigned pos, unsigned val)
+{
+       u32 *map = (u32 *) tn;
+       u32 bit_in_map;
+       u32 bit_in_word;
+       u32 word_in_map;
+       u32 mask;
 
-       if (yaffs_SkipVerification(dev))
-               return;
+       pos &= YAFFS_TNODES_LEVEL0_MASK;
+       val >>= dev->chunk_grp_bits;
 
-       /* Check sane object header chunk */
+       bit_in_map = pos * dev->tnode_width;
+       word_in_map = bit_in_map / 32;
+       bit_in_word = bit_in_map & (32 - 1);
 
-       chunkMin = dev->internalStartBlock * dev->param.nChunksPerBlock;
-       chunkMax = (dev->internalEndBlock+1) * dev->param.nChunksPerBlock - 1;
+       mask = dev->tnode_mask << bit_in_word;
 
-       chunkInRange = (((unsigned)(obj->hdrChunk)) >= chunkMin && ((unsigned)(obj->hdrChunk)) <= chunkMax);
-       chunkIdOk = chunkInRange || (obj->hdrChunk == 0);
-       chunkValid = chunkInRange &&
-                       yaffs_CheckChunkBit(dev,
-                                       obj->hdrChunk / dev->param.nChunksPerBlock,
-                                       obj->hdrChunk % dev->param.nChunksPerBlock);
-       chunkShouldNotBeDeleted = chunkInRange && !chunkValid;
+       map[word_in_map] &= ~mask;
+       map[word_in_map] |= (mask & (val << bit_in_word));
 
-       if (!obj->fake &&
-                       (!chunkIdOk || chunkShouldNotBeDeleted)) {
-               T(YAFFS_TRACE_VERIFY,
-                       (TSTR("Obj %d has chunkId %d %s %s"TENDSTR),
-                       obj->objectId, obj->hdrChunk,
-                       chunkIdOk ? "" : ",out of range",
-                       chunkShouldNotBeDeleted ? ",marked as deleted" : ""));
+       if (dev->tnode_width > (32 - bit_in_word)) {
+               bit_in_word = (32 - bit_in_word);
+               word_in_map++;
+               mask =
+                   dev->tnode_mask >> bit_in_word;
+               map[word_in_map] &= ~mask;
+               map[word_in_map] |= (mask & (val >> bit_in_word));
        }
+}
 
-       if (chunkValid && !yaffs_SkipNANDVerification(dev)) {
-               yaffs_ExtendedTags tags;
-               yaffs_ObjectHeader *oh;
-               __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
+u32 yaffs_get_group_base(struct yaffs_dev *dev, struct yaffs_tnode *tn,
+                        unsigned pos)
+{
+       u32 *map = (u32 *) tn;
+       u32 bit_in_map;
+       u32 bit_in_word;
+       u32 word_in_map;
+       u32 val;
 
-               oh = (yaffs_ObjectHeader *)buffer;
+       pos &= YAFFS_TNODES_LEVEL0_MASK;
 
-               yaffs_ReadChunkWithTagsFromNAND(dev, obj->hdrChunk, buffer,
-                               &tags);
+       bit_in_map = pos * dev->tnode_width;
+       word_in_map = bit_in_map / 32;
+       bit_in_word = bit_in_map & (32 - 1);
 
-               yaffs_VerifyObjectHeader(obj, oh, &tags, 1);
+       val = map[word_in_map] >> bit_in_word;
 
-               yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
+       if (dev->tnode_width > (32 - bit_in_word)) {
+               bit_in_word = (32 - bit_in_word);
+               word_in_map++;
+               val |= (map[word_in_map] << bit_in_word);
        }
 
-       /* Verify it has a parent */
-       if (obj && !obj->fake &&
-                       (!obj->parent || obj->parent->myDev != dev)) {
-               T(YAFFS_TRACE_VERIFY,
-                       (TSTR("Obj %d has parent pointer %p which does not look like an object"TENDSTR),
-                       obj->objectId, obj->parent));
-       }
-
-       /* Verify parent is a directory */
-       if (obj->parent && obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
-               T(YAFFS_TRACE_VERIFY,
-                       (TSTR("Obj %d's parent is not a directory (type %d)"TENDSTR),
-                       obj->objectId, obj->parent->variantType));
-       }
-
-       switch (obj->variantType) {
-       case YAFFS_OBJECT_TYPE_FILE:
-               yaffs_VerifyFile(obj);
-               break;
-       case YAFFS_OBJECT_TYPE_SYMLINK:
-               yaffs_VerifySymlink(obj);
-               break;
-       case YAFFS_OBJECT_TYPE_DIRECTORY:
-               yaffs_VerifyDirectory(obj);
-               break;
-       case YAFFS_OBJECT_TYPE_HARDLINK:
-               yaffs_VerifyHardLink(obj);
-               break;
-       case YAFFS_OBJECT_TYPE_SPECIAL:
-               yaffs_VerifySpecial(obj);
-               break;
-       case YAFFS_OBJECT_TYPE_UNKNOWN:
-       default:
-               T(YAFFS_TRACE_VERIFY,
-               (TSTR("Obj %d has illegaltype %d"TENDSTR),
-               obj->objectId, obj->variantType));
-               break;
-       }
-}
-
-static void yaffs_VerifyObjects(yaffs_Device *dev)
-{
-       yaffs_Object *obj;
-       int i;
-       struct ylist_head *lh;
-
-       if (yaffs_SkipVerification(dev))
-               return;
-
-       /* Iterate through the objects in each hash entry */
-
-       for (i = 0; i <  YAFFS_NOBJECT_BUCKETS; i++) {
-               ylist_for_each(lh, &dev->objectBucket[i].list) {
-                       if (lh) {
-                               obj = ylist_entry(lh, yaffs_Object, hashLink);
-                               yaffs_VerifyObject(obj);
-                       }
-               }
-       }
-}
-
-
-/*
- *  Simple hash function. Needs to have a reasonable spread
- */
-
-static Y_INLINE int yaffs_HashFunction(int n)
-{
-       n = abs(n);
-       return n % YAFFS_NOBJECT_BUCKETS;
-}
-
-/*
- * Access functions to useful fake objects.
- * Note that root might have a presence in NAND if permissions are set.
- */
-
-yaffs_Object *yaffs_Root(yaffs_Device *dev)
-{
-       return dev->rootDir;
-}
-
-yaffs_Object *yaffs_LostNFound(yaffs_Device *dev)
-{
-       return dev->lostNFoundDir;
-}
-
-
-/*
- *  Erased NAND checking functions
- */
-
-int yaffs_CheckFF(__u8 *buffer, int nBytes)
-{
-       /* Horrible, slow implementation */
-       while (nBytes--) {
-               if (*buffer != 0xFF)
-                       return 0;
-               buffer++;
-       }
-       return 1;
-}
-
-static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
-                               int chunkInNAND)
-{
-       int retval = YAFFS_OK;
-       __u8 *data = yaffs_GetTempBuffer(dev, __LINE__);
-       yaffs_ExtendedTags tags;
-       int result;
-
-       result = yaffs_ReadChunkWithTagsFromNAND(dev, chunkInNAND, data, &tags);
-
-       if (tags.eccResult > YAFFS_ECC_RESULT_NO_ERROR)
-               retval = YAFFS_FAIL;
-
-       if (!yaffs_CheckFF(data, dev->nDataBytesPerChunk) || tags.chunkUsed) {
-               T(YAFFS_TRACE_NANDACCESS,
-                 (TSTR("Chunk %d not erased" TENDSTR), chunkInNAND));
-               retval = YAFFS_FAIL;
-       }
-
-       yaffs_ReleaseTempBuffer(dev, data, __LINE__);
-
-       return retval;
-
-}
-
-
-static int yaffs_VerifyChunkWritten(yaffs_Device *dev,
-                                       int chunkInNAND,
-                                       const __u8 *data,
-                                       yaffs_ExtendedTags *tags)
-{
-       int retval = YAFFS_OK;
-       yaffs_ExtendedTags tempTags;
-       __u8 *buffer = yaffs_GetTempBuffer(dev,__LINE__);
-       int result;
-       
-       result = yaffs_ReadChunkWithTagsFromNAND(dev,chunkInNAND,buffer,&tempTags);
-       if(memcmp(buffer,data,dev->nDataBytesPerChunk) ||
-               tempTags.objectId != tags->objectId ||
-               tempTags.chunkId  != tags->chunkId ||
-               tempTags.byteCount != tags->byteCount)
-               retval = YAFFS_FAIL;
-
-       yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
-
-       return retval;
-}
-
-static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev,
-                                       const __u8 *data,
-                                       yaffs_ExtendedTags *tags,
-                                       int useReserve)
-{
-       int attempts = 0;
-       int writeOk = 0;
-       int chunk;
-
-       yaffs_InvalidateCheckpoint(dev);
-
-       do {
-               yaffs_BlockInfo *bi = 0;
-               int erasedOk = 0;
-
-               chunk = yaffs_AllocateChunk(dev, useReserve, &bi);
-               if (chunk < 0) {
-                       /* no space */
-                       break;
-               }
-
-               /* First check this chunk is erased, if it needs
-                * checking.  The checking policy (unless forced
-                * always on) is as follows:
-                *
-                * Check the first page we try to write in a block.
-                * If the check passes then we don't need to check any
-                * more.        If the check fails, we check again...
-                * If the block has been erased, we don't need to check.
-                *
-                * However, if the block has been prioritised for gc,
-                * then we think there might be something odd about
-                * this block and stop using it.
-                *
-                * Rationale: We should only ever see chunks that have
-                * not been erased if there was a partially written
-                * chunk due to power loss.  This checking policy should
-                * catch that case with very few checks and thus save a
-                * lot of checks that are most likely not needed.
-                *
-                * Mods to the above
-                * If an erase check fails or the write fails we skip the 
-                * rest of the block.
-                */
-
-               /* let's give it a try */
-               attempts++;
-
-#ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
-               bi->skipErasedCheck = 0;
-#endif
-               if (!bi->skipErasedCheck) {
-                       erasedOk = yaffs_CheckChunkErased(dev, chunk);
-                       if (erasedOk != YAFFS_OK) {
-                               T(YAFFS_TRACE_ERROR,
-                               (TSTR("**>> yaffs chunk %d was not erased"
-                               TENDSTR), chunk));
-
-                               /* If not erased, delete this one,
-                                * skip rest of block and
-                                * try another chunk */
-                                yaffs_DeleteChunk(dev,chunk,1,__LINE__);
-                                yaffs_SkipRestOfBlock(dev);
-                               continue;
-                       }
-               }
-
-               writeOk = yaffs_WriteChunkWithTagsToNAND(dev, chunk,
-                               data, tags);
-
-               if(!bi->skipErasedCheck)
-                       writeOk = yaffs_VerifyChunkWritten(dev, chunk, data, tags);
-
-               if (writeOk != YAFFS_OK) {
-                       /* Clean up aborted write, skip to next block and
-                        * try another chunk */
-                       yaffs_HandleWriteChunkError(dev, chunk, erasedOk);
-                       continue;
-               }
-
-               bi->skipErasedCheck = 1;
-
-               /* Copy the data into the robustification buffer */
-               yaffs_HandleWriteChunkOk(dev, chunk, data, tags);
-
-       } while (writeOk != YAFFS_OK &&
-               (yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts));
-
-       if (!writeOk)
-               chunk = -1;
-
-       if (attempts > 1) {
-               T(YAFFS_TRACE_ERROR,
-                       (TSTR("**>> yaffs write required %d attempts" TENDSTR),
-                       attempts));
-
-               dev->nRetriedWrites += (attempts - 1);
-       }
-
-       return chunk;
-}
-
-
-/*
- * Oldest Dirty Sequence Number handling.
- */
-/* yaffs_CalcOldestDirtySequence()
- * yaffs_FindOldestDirtySequence()
- * Calculate the oldest dirty sequence number if we don't know it.
- */
-static int yaffs_CalcOldestDirtySequence(yaffs_Device *dev)
-{
-       int i;
-       __u32 seq;
-       yaffs_BlockInfo *b;
-
-       if(!dev->param.isYaffs2)
-               return 0;
-
-       /* Find the oldest dirty sequence number. */
-       seq = dev->sequenceNumber;
-       b = dev->blockInfo;
-       for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
-               if (b->blockState == YAFFS_BLOCK_STATE_FULL &&
-                   (b->pagesInUse - b->softDeletions) < dev->param.nChunksPerBlock &&
-                   b->sequenceNumber < seq) 
-                               seq = b->sequenceNumber;
-               b++;
-       }
-       return seq;
-}
-
-
-static void yaffs_FindOldestDirtySequence(yaffs_Device *dev)
-{
-       if(dev->param.isYaffs2 && !dev->oldestDirtySequence)
-               dev->oldestDirtySequence = 
-                       yaffs_CalcOldestDirtySequence(dev);
-
-#if 0
-       if(!yaffs_SkipVerification(dev) &&
-               dev->oldestDirtySequence != yaffs_CalcOldestDirtySequence(dev))
-               YBUG();
-
-#endif
-}
-
-/*
- * yaffs_ClearOldestDirtySequence()
- * Called when a block is erased or marked bad. (ie. when its sequenceNumber
- * becomes invalid). If the value matches the oldest then we clear 
- * dev->oldestDirtySequence to force its recomputation.
- */
-static void yaffs_ClearOldestDirtySequence(yaffs_Device *dev, yaffs_BlockInfo *bi)
-{
-
-       if(!dev->param.isYaffs2)
-               return;
-
-       if(!bi || bi->sequenceNumber == dev->oldestDirtySequence)
-               dev->oldestDirtySequence = 0;
-}
-
-/*
- * yaffs_UpdateOldestDirtySequence()
- * Update the oldest dirty sequence number whenever we dirty a block.
- * Only do this if the oldestDirtySequence is actually being tracked.
- */
-static void yaffs_UpdateOldestDirtySequence(yaffs_Device *dev, yaffs_BlockInfo *bi)
-{
-       if(dev->param.isYaffs2 && dev->oldestDirtySequence){
-               if(dev->oldestDirtySequence > bi->sequenceNumber)
-                       dev->oldestDirtySequence = bi->sequenceNumber;
-       }
-}
-/*
- * Block retiring for handling a broken block.
- */
-
-static void yaffs_RetireBlock(yaffs_Device *dev, int blockInNAND)
-{
-       yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
-
-       yaffs_InvalidateCheckpoint(dev);
-       
-       yaffs_ClearOldestDirtySequence(dev,bi);
-
-       if (yaffs_MarkBlockBad(dev, blockInNAND) != YAFFS_OK) {
-               if (yaffs_EraseBlockInNAND(dev, blockInNAND) != YAFFS_OK) {
-                       T(YAFFS_TRACE_ALWAYS, (TSTR(
-                               "yaffs: Failed to mark bad and erase block %d"
-                               TENDSTR), blockInNAND));
-               } else {
-                       yaffs_ExtendedTags tags;
-                       int chunkId = blockInNAND * dev->param.nChunksPerBlock;
-
-                       __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
-
-                       memset(buffer, 0xff, dev->nDataBytesPerChunk);
-                       yaffs_InitialiseTags(&tags);
-                       tags.sequenceNumber = YAFFS_SEQUENCE_BAD_BLOCK;
-                       if (dev->param.writeChunkWithTagsToNAND(dev, chunkId -
-                               dev->chunkOffset, buffer, &tags) != YAFFS_OK)
-                               T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Failed to "
-                                       TCONT("write bad block marker to block %d")
-                                       TENDSTR), blockInNAND));
-
-                       yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
-               }
-       }
-
-       bi->blockState = YAFFS_BLOCK_STATE_DEAD;
-       bi->gcPrioritise = 0;
-       bi->needsRetiring = 0;
-
-       dev->nRetiredBlocks++;
-}
-
-/*
- * Functions for robustisizing TODO
- *
- */
-
-static void yaffs_HandleWriteChunkOk(yaffs_Device *dev, int chunkInNAND,
-                               const __u8 *data,
-                               const yaffs_ExtendedTags *tags)
-{
-       dev=dev;
-       chunkInNAND=chunkInNAND;
-       data=data;
-       tags=tags;
-}
-
-static void yaffs_HandleUpdateChunk(yaffs_Device *dev, int chunkInNAND,
-                               const yaffs_ExtendedTags *tags)
-{
-       dev=dev;
-       chunkInNAND=chunkInNAND;
-       tags=tags;
-}
-
-void yaffs_HandleChunkError(yaffs_Device *dev, yaffs_BlockInfo *bi)
-{
-       if (!bi->gcPrioritise) {
-               bi->gcPrioritise = 1;
-               dev->hasPendingPrioritisedGCs = 1;
-               bi->chunkErrorStrikes++;
-
-               if (bi->chunkErrorStrikes > 3) {
-                       bi->needsRetiring = 1; /* Too many stikes, so retire this */
-                       T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Block struck out" TENDSTR)));
-
-               }
-       }
-}
-
-static void yaffs_HandleWriteChunkError(yaffs_Device *dev, int chunkInNAND,
-               int erasedOk)
-{
-       int blockInNAND = chunkInNAND / dev->param.nChunksPerBlock;
-       yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
-
-       yaffs_HandleChunkError(dev, bi);
-
-       if (erasedOk) {
-               /* Was an actual write failure, so mark the block for retirement  */
-               bi->needsRetiring = 1;
-               T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
-                 (TSTR("**>> Block %d needs retiring" TENDSTR), blockInNAND));
-       }
-
-       /* Delete the chunk */
-       yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
-       yaffs_SkipRestOfBlock(dev);
-}
-
-
-/*---------------- Name handling functions ------------*/
-
-static __u16 yaffs_CalcNameSum(const YCHAR *name)
-{
-       __u16 sum = 0;
-       __u16 i = 1;
-
-       const YUCHAR *bname = (const YUCHAR *) name;
-       if (bname) {
-               while ((*bname) && (i < (YAFFS_MAX_NAME_LENGTH/2))) {
-
-#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
-                       sum += yaffs_toupper(*bname) * i;
-#else
-                       sum += (*bname) * i;
-#endif
-                       i++;
-                       bname++;
-               }
-       }
-       return sum;
-}
-
-static void yaffs_SetObjectName(yaffs_Object *obj, const YCHAR *name)
-{
-#ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
-       memset(obj->shortName, 0, sizeof(YCHAR) * (YAFFS_SHORT_NAME_LENGTH+1));
-       if (name && yaffs_strnlen(name,YAFFS_SHORT_NAME_LENGTH+1) <= YAFFS_SHORT_NAME_LENGTH)
-               yaffs_strcpy(obj->shortName, name);
-       else
-               obj->shortName[0] = _Y('\0');
-#endif
-       obj->sum = yaffs_CalcNameSum(name);
-}
-
-/*-------------------- TNODES -------------------
-
- * List of spare tnodes
- * The list is hooked together using the first pointer
- * in the tnode.
- */
-
-/* yaffs_CreateTnodes creates a bunch more tnodes and
- * adds them to the tnode free list.
- * Don't use this function directly
- */
-static Y_INLINE int yaffs_CalcTnodeSize(yaffs_Device *dev)
-{
-       int tnodeSize;
-       /* Calculate the tnode size in bytes for variable width tnode support.
-        * Must be a multiple of 32-bits  */
-       tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
-
-       if (tnodeSize < sizeof(yaffs_Tnode))
-               tnodeSize = sizeof(yaffs_Tnode);
-       return tnodeSize;
-}
-
-static int yaffs_CreateTnodes(yaffs_Device *dev, int nTnodes)
-{
-       int i;
-       int tnodeSize = yaffs_CalcTnodeSize(dev);
-       yaffs_Tnode *newTnodes;
-       __u8 *mem;
-       yaffs_Tnode *curr;
-       yaffs_Tnode *next;
-       yaffs_TnodeList *tnl;
-
-       if (nTnodes < 1)
-               return YAFFS_OK;
-
-
-       /* make these things */
-
-       newTnodes = YMALLOC(nTnodes * tnodeSize);
-       mem = (__u8 *)newTnodes;
-
-       if (!newTnodes) {
-               T(YAFFS_TRACE_ERROR,
-                       (TSTR("yaffs: Could not allocate Tnodes" TENDSTR)));
-               return YAFFS_FAIL;
-       }
-
-       /* Hook them into the free list */
-#if 0
-       for (i = 0; i < nTnodes - 1; i++) {
-               newTnodes[i].internal[0] = &newTnodes[i + 1];
-#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
-               newTnodes[i].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
-#endif
-       }
-
-       newTnodes[nTnodes - 1].internal[0] = dev->freeTnodes;
-#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
-       newTnodes[nTnodes - 1].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
-#endif
-       dev->freeTnodes = newTnodes;
-#else
-       /* New hookup for wide tnodes */
-       for (i = 0; i < nTnodes - 1; i++) {
-               curr = (yaffs_Tnode *) &mem[i * tnodeSize];
-               next = (yaffs_Tnode *) &mem[(i+1) * tnodeSize];
-               curr->internal[0] = next;
-       }
-
-       curr = (yaffs_Tnode *) &mem[(nTnodes - 1) * tnodeSize];
-       curr->internal[0] = dev->freeTnodes;
-       dev->freeTnodes = (yaffs_Tnode *)mem;
-
-#endif
-
-
-       dev->nFreeTnodes += nTnodes;
-       dev->nTnodesCreated += nTnodes;
-
-       /* Now add this bunch of tnodes to a list for freeing up.
-        * NB If we can't add this to the management list it isn't fatal
-        * but it just means we can't free this bunch of tnodes later.
-        */
-
-       tnl = YMALLOC(sizeof(yaffs_TnodeList));
-       if (!tnl) {
-               T(YAFFS_TRACE_ERROR,
-                 (TSTR
-                  ("yaffs: Could not add tnodes to management list" TENDSTR)));
-                  return YAFFS_FAIL;
-       } else {
-               tnl->tnodes = newTnodes;
-               tnl->next = dev->allocatedTnodeList;
-               dev->allocatedTnodeList = tnl;
-       }
-
-       T(YAFFS_TRACE_ALLOCATE, (TSTR("yaffs: Tnodes added" TENDSTR)));
-
-       return YAFFS_OK;
-}
-
-/* GetTnode gets us a clean tnode. Tries to make allocate more if we run out */
-
-static yaffs_Tnode *yaffs_GetTnodeRaw(yaffs_Device *dev)
-{
-       yaffs_Tnode *tn = NULL;
-
-#ifdef CONFIG_YAFFS_VALGRIND_TEST
-       tn = YMALLOC(yaffs_CalcTnodeSize(dev));
-       if(tn)
-               dev->nTnodesCreated++;
-#else
-       /* If there are none left make more */
-       if (!dev->freeTnodes)
-               yaffs_CreateTnodes(dev, YAFFS_ALLOCATION_NTNODES);
-
-       if (dev->freeTnodes) {
-               tn = dev->freeTnodes;
-#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
-               if (tn->internal[YAFFS_NTNODES_INTERNAL] != (void *)1) {
-                       /* Hoosterman, this thing looks like it isn't in the list */
-                       T(YAFFS_TRACE_ALWAYS,
-                         (TSTR("yaffs: Tnode list bug 1" TENDSTR)));
-               }
-#endif
-               dev->freeTnodes = dev->freeTnodes->internal[0];
-               dev->nFreeTnodes--;
-       }
-#endif
-       dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
-
-       return tn;
-}
-
-static yaffs_Tnode *yaffs_GetTnode(yaffs_Device *dev)
-{
-       yaffs_Tnode *tn = yaffs_GetTnodeRaw(dev);
-       int tnodeSize = yaffs_CalcTnodeSize(dev);
-
-       if (tn)
-               memset(tn, 0, tnodeSize);
-
-       return tn;
-}
-
-/* FreeTnode frees up a tnode and puts it back on the free list */
-static void yaffs_FreeTnode(yaffs_Device *dev, yaffs_Tnode *tn)
-{
-       if (tn) {
-#ifdef CONFIG_YAFFS_VALGRIND_TEST
-               YFREE(tn);
-               dev->nTnodesCreated--;
-#else
-#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
-               if (tn->internal[YAFFS_NTNODES_INTERNAL] != 0) {
-                       /* Hoosterman, this thing looks like it is already in the list */
-                       T(YAFFS_TRACE_ALWAYS,
-                         (TSTR("yaffs: Tnode list bug 2" TENDSTR)));
-               }
-               tn->internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
-#endif
-               tn->internal[0] = dev->freeTnodes;
-               dev->freeTnodes = tn;
-               dev->nFreeTnodes++;
-#endif
-       }
-       dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
-}
-
-static void yaffs_DeinitialiseTnodes(yaffs_Device *dev)
-{
-       /* Free the list of allocated tnodes */
-       yaffs_TnodeList *tmp;
-
-       while (dev->allocatedTnodeList) {
-               tmp = dev->allocatedTnodeList->next;
-
-               YFREE(dev->allocatedTnodeList->tnodes);
-               YFREE(dev->allocatedTnodeList);
-               dev->allocatedTnodeList = tmp;
-
-       }
-
-       dev->freeTnodes = NULL;
-       dev->nFreeTnodes = 0;
-       dev->nTnodesCreated = 0;
-}
-
-static void yaffs_InitialiseTnodes(yaffs_Device *dev)
-{
-       dev->allocatedTnodeList = NULL;
-       dev->freeTnodes = NULL;
-       dev->nFreeTnodes = 0;
-       dev->nTnodesCreated = 0;
-}
-
-
-void yaffs_LoadLevel0Tnode(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos,
-               unsigned val)
-{
-       __u32 *map = (__u32 *)tn;
-       __u32 bitInMap;
-       __u32 bitInWord;
-       __u32 wordInMap;
-       __u32 mask;
-
-       pos &= YAFFS_TNODES_LEVEL0_MASK;
-       val >>= dev->chunkGroupBits;
-
-       bitInMap = pos * dev->tnodeWidth;
-       wordInMap = bitInMap / 32;
-       bitInWord = bitInMap & (32 - 1);
-
-       mask = dev->tnodeMask << bitInWord;
-
-       map[wordInMap] &= ~mask;
-       map[wordInMap] |= (mask & (val << bitInWord));
-
-       if (dev->tnodeWidth > (32 - bitInWord)) {
-               bitInWord = (32 - bitInWord);
-               wordInMap++;;
-               mask = dev->tnodeMask >> (/*dev->tnodeWidth -*/ bitInWord);
-               map[wordInMap] &= ~mask;
-               map[wordInMap] |= (mask & (val >> bitInWord));
-       }
-}
-
-static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn,
-               unsigned pos)
-{
-       __u32 *map = (__u32 *)tn;
-       __u32 bitInMap;
-       __u32 bitInWord;
-       __u32 wordInMap;
-       __u32 val;
-
-       pos &= YAFFS_TNODES_LEVEL0_MASK;
-
-       bitInMap = pos * dev->tnodeWidth;
-       wordInMap = bitInMap / 32;
-       bitInWord = bitInMap & (32 - 1);
-
-       val = map[wordInMap] >> bitInWord;
-
-       if      (dev->tnodeWidth > (32 - bitInWord)) {
-               bitInWord = (32 - bitInWord);
-               wordInMap++;;
-               val |= (map[wordInMap] << bitInWord);
-       }
-
-       val &= dev->tnodeMask;
-       val <<= dev->chunkGroupBits;
-
-       return val;
-}
-
-/* ------------------- End of individual tnode manipulation -----------------*/
-
-/* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
- * The look up tree is represented by the top tnode and the number of topLevel
- * in the tree. 0 means only the level 0 tnode is in the tree.
- */
-
-/* FindLevel0Tnode finds the level 0 tnode, if one exists. */
-static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev,
-                                       yaffs_FileStructure *fStruct,
-                                       __u32 chunkId)
-{
-       yaffs_Tnode *tn = fStruct->top;
-       __u32 i;
-       int requiredTallness;
-       int level = fStruct->topLevel;
-
-       dev=dev;
-
-       /* Check sane level and chunk Id */
-       if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL)
-               return NULL;
-
-       if (chunkId > YAFFS_MAX_CHUNK_ID)
-               return NULL;
-
-       /* First check we're tall enough (ie enough topLevel) */
-
-       i = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
-       requiredTallness = 0;
-       while (i) {
-               i >>= YAFFS_TNODES_INTERNAL_BITS;
-               requiredTallness++;
-       }
-
-       if (requiredTallness > fStruct->topLevel)
-               return NULL; /* Not tall enough, so we can't find it */
-
-       /* Traverse down to level 0 */
-       while (level > 0 && tn) {
-               tn = tn->internal[(chunkId >>
-                       (YAFFS_TNODES_LEVEL0_BITS +
-                               (level - 1) *
-                               YAFFS_TNODES_INTERNAL_BITS)) &
-                       YAFFS_TNODES_INTERNAL_MASK];
-               level--;
-       }
-
-       return tn;
-}
-
-/* AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.
- * This happens in two steps:
- *  1. If the tree isn't tall enough, then make it taller.
- *  2. Scan down the tree towards the level 0 tnode adding tnodes if required.
- *
- * Used when modifying the tree.
- *
- *  If the tn argument is NULL, then a fresh tnode will be added otherwise the specified tn will
- *  be plugged into the ttree.
- */
-
-static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device *dev,
-                                       yaffs_FileStructure *fStruct,
-                                       __u32 chunkId,
-                                       yaffs_Tnode *passedTn)
-{
-       int requiredTallness;
-       int i;
-       int l;
-       yaffs_Tnode *tn;
-
-       __u32 x;
-
-
-       /* Check sane level and page Id */
-       if (fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL)
-               return NULL;
-
-       if (chunkId > YAFFS_MAX_CHUNK_ID)
-               return NULL;
-
-       /* First check we're tall enough (ie enough topLevel) */
-
-       x = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
-       requiredTallness = 0;
-       while (x) {
-               x >>= YAFFS_TNODES_INTERNAL_BITS;
-               requiredTallness++;
-       }
-
-
-       if (requiredTallness > fStruct->topLevel) {
-               /* Not tall enough, gotta make the tree taller */
-               for (i = fStruct->topLevel; i < requiredTallness; i++) {
-
-                       tn = yaffs_GetTnode(dev);
-
-                       if (tn) {
-                               tn->internal[0] = fStruct->top;
-                               fStruct->top = tn;
-                               fStruct->topLevel++;
-                       } else {
-                               T(YAFFS_TRACE_ERROR,
-                                       (TSTR("yaffs: no more tnodes" TENDSTR)));
-                               return NULL;
-                       }
-               }
-       }
-
-       /* Traverse down to level 0, adding anything we need */
-
-       l = fStruct->topLevel;
-       tn = fStruct->top;
-
-       if (l > 0) {
-               while (l > 0 && tn) {
-                       x = (chunkId >>
-                            (YAFFS_TNODES_LEVEL0_BITS +
-                             (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
-                           YAFFS_TNODES_INTERNAL_MASK;
-
-
-                       if ((l > 1) && !tn->internal[x]) {
-                               /* Add missing non-level-zero tnode */
-                               tn->internal[x] = yaffs_GetTnode(dev);
-                               if(!tn->internal[x])
-                                       return NULL;
-                       } else if (l == 1) {
-                               /* Looking from level 1 at level 0 */
-                               if (passedTn) {
-                                       /* If we already have one, then release it.*/
-                                       if (tn->internal[x])
-                                               yaffs_FreeTnode(dev, tn->internal[x]);
-                                       tn->internal[x] = passedTn;
-
-                               } else if (!tn->internal[x]) {
-                                       /* Don't have one, none passed in */
-                                       tn->internal[x] = yaffs_GetTnode(dev);
-                                       if(!tn->internal[x])
-                                               return NULL;
-                               }
-                       }
-
-                       tn = tn->internal[x];
-                       l--;
-               }
-       } else {
-               /* top is level 0 */
-               if (passedTn) {
-                       memcpy(tn, passedTn, (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
-                       yaffs_FreeTnode(dev, passedTn);
-               }
-       }
-
-       return tn;
-}
-
-static int yaffs_FindChunkInGroup(yaffs_Device *dev, int theChunk,
-                               yaffs_ExtendedTags *tags, int objectId,
-                               int chunkInInode)
-{
-       int j;
-
-       for (j = 0; theChunk && j < dev->chunkGroupSize; j++) {
-               if (yaffs_CheckChunkBit(dev, theChunk / dev->param.nChunksPerBlock,
-                               theChunk % dev->param.nChunksPerBlock)) {
-                       
-                       if(dev->chunkGroupSize == 1)
-                               return theChunk;
-                       else {
-                               yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL,
-                                                               tags);
-                               if (yaffs_TagsMatch(tags, objectId, chunkInInode)) {
-                                       /* found it; */
-                                       return theChunk;
-                               }
-                       }
-               }
-               theChunk++;
-       }
-       return -1;
-}
-
-
-/* DeleteWorker scans backwards through the tnode tree and deletes all the
- * chunks and tnodes in the file
- * Returns 1 if the tree was deleted.
- * Returns 0 if it stopped early due to hitting the limit and the delete is incomplete.
- */
-
-static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level,
-                             int chunkOffset, int *limit)
-{
-       int i;
-       int chunkInInode;
-       int theChunk;
-       yaffs_ExtendedTags tags;
-       int foundChunk;
-       yaffs_Device *dev = in->myDev;
-
-       int allDone = 1;
-
-       if (tn) {
-               if (level > 0) {
-                       for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
-                            i--) {
-                               if (tn->internal[i]) {
-                                       if (limit && (*limit) < 0) {
-                                               allDone = 0;
-                                       } else {
-                                               allDone =
-                                                       yaffs_DeleteWorker(in,
-                                                               tn->
-                                                               internal
-                                                               [i],
-                                                               level -
-                                                               1,
-                                                               (chunkOffset
-                                                                       <<
-                                                                       YAFFS_TNODES_INTERNAL_BITS)
-                                                               + i,
-                                                               limit);
-                                       }
-                                       if (allDone) {
-                                               yaffs_FreeTnode(dev,
-                                                               tn->
-                                                               internal[i]);
-                                               tn->internal[i] = NULL;
-                                       }
-                               }
-                       }
-                       return (allDone) ? 1 : 0;
-               } else if (level == 0) {
-                       int hitLimit = 0;
-
-                       for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0 && !hitLimit;
-                                       i--) {
-                               theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
-                               if (theChunk) {
-
-                                       chunkInInode = (chunkOffset <<
-                                               YAFFS_TNODES_LEVEL0_BITS) + i;
-
-                                       foundChunk =
-                                               yaffs_FindChunkInGroup(dev,
-                                                               theChunk,
-                                                               &tags,
-                                                               in->objectId,
-                                                               chunkInInode);
-
-                                       if (foundChunk > 0) {
-                                               yaffs_DeleteChunk(dev,
-                                                                 foundChunk, 1,
-                                                                 __LINE__);
-                                               in->nDataChunks--;
-                                               if (limit) {
-                                                       *limit = *limit - 1;
-                                                       if (*limit <= 0)
-                                                               hitLimit = 1;
-                                               }
-
-                                       }
-
-                                       yaffs_LoadLevel0Tnode(dev, tn, i, 0);
-                               }
-
-                       }
-                       return (i < 0) ? 1 : 0;
-
-               }
-
-       }
-
-       return 1;
-
-}
-
-static void yaffs_SoftDeleteChunk(yaffs_Device *dev, int chunk)
-{
-       yaffs_BlockInfo *theBlock;
-
-       T(YAFFS_TRACE_DELETION, (TSTR("soft delete chunk %d" TENDSTR), chunk));
-
-       theBlock = yaffs_GetBlockInfo(dev, chunk / dev->param.nChunksPerBlock);
-       if (theBlock) {
-               theBlock->softDeletions++;
-               dev->nFreeChunks++;
-               yaffs_UpdateOldestDirtySequence(dev,theBlock);
-       }
-}
-
-/* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
- * All soft deleting does is increment the block's softdelete count and pulls the chunk out
- * of the tnode.
- * Thus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
- */
-
-static int yaffs_SoftDeleteWorker(yaffs_Object *in, yaffs_Tnode *tn,
-                                 __u32 level, int chunkOffset)
-{
-       int i;
-       int theChunk;
-       int allDone = 1;
-       yaffs_Device *dev = in->myDev;
-
-       if (tn) {
-               if (level > 0) {
-
-                       for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
-                            i--) {
-                               if (tn->internal[i]) {
-                                       allDone =
-                                           yaffs_SoftDeleteWorker(in,
-                                                                  tn->
-                                                                  internal[i],
-                                                                  level - 1,
-                                                                  (chunkOffset
-                                                                   <<
-                                                                   YAFFS_TNODES_INTERNAL_BITS)
-                                                                  + i);
-                                       if (allDone) {
-                                               yaffs_FreeTnode(dev,
-                                                               tn->
-                                                               internal[i]);
-                                               tn->internal[i] = NULL;
-                                       } else {
-                                               /* Hoosterman... how could this happen? */
-                                       }
-                               }
-                       }
-                       return (allDone) ? 1 : 0;
-               } else if (level == 0) {
-
-                       for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
-                               theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
-                               if (theChunk) {
-                                       /* Note this does not find the real chunk, only the chunk group.
-                                        * We make an assumption that a chunk group is not larger than
-                                        * a block.
-                                        */
-                                       yaffs_SoftDeleteChunk(dev, theChunk);
-                                       yaffs_LoadLevel0Tnode(dev, tn, i, 0);
-                               }
-
-                       }
-                       return 1;
-
-               }
-
-       }
-
-       return 1;
-
-}
-
-static void yaffs_SoftDeleteFile(yaffs_Object *obj)
-{
-       if (obj->deleted &&
-           obj->variantType == YAFFS_OBJECT_TYPE_FILE && !obj->softDeleted) {
-               if (obj->nDataChunks <= 0) {
-                       /* Empty file with no duplicate object headers, just delete it immediately */
-                       yaffs_FreeTnode(obj->myDev,
-                                       obj->variant.fileVariant.top);
-                       obj->variant.fileVariant.top = NULL;
-                       T(YAFFS_TRACE_TRACING,
-                         (TSTR("yaffs: Deleting empty file %d" TENDSTR),
-                          obj->objectId));
-                       yaffs_DoGenericObjectDeletion(obj);
-               } else {
-                       yaffs_SoftDeleteWorker(obj,
-                                              obj->variant.fileVariant.top,
-                                              obj->variant.fileVariant.
-                                              topLevel, 0);
-                       obj->softDeleted = 1;
-               }
-       }
-}
-
-/* Pruning removes any part of the file structure tree that is beyond the
- * bounds of the file (ie that does not point to chunks).
- *
- * A file should only get pruned when its size is reduced.
- *
- * Before pruning, the chunks must be pulled from the tree and the
- * level 0 tnode entries must be zeroed out.
- * Could also use this for file deletion, but that's probably better handled
- * by a special case.
- *
- * This function is recursive. For levels > 0 the function is called again on
- * any sub-tree. For level == 0 we just check if the sub-tree has data.
- * If there is no data in a subtree then it is pruned.
- */
-
-static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device *dev, yaffs_Tnode *tn,
-                               __u32 level, int del0)
-{
-       int i;
-       int hasData;
-
-       if (tn) {
-               hasData = 0;
-
-               if(level > 0){
-                       for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
-                               if (tn->internal[i]) {
-                                       tn->internal[i] =
-                                               yaffs_PruneWorker(dev, tn->internal[i],
-                                                       level - 1,
-                                                       (i == 0) ? del0 : 1);
-                               }
-
-                               if (tn->internal[i])
-                                       hasData++;
-                       }
-               } else {
-                       int tnodeSize_u32 = yaffs_CalcTnodeSize(dev)/sizeof(__u32);
-                       __u32 *map = (__u32 *)tn;
-
-                        for(i = 0; !hasData && i < tnodeSize_u32; i++){
-                                if(map[i])
-                                        hasData++;
-                        }
-                }
-
-               if (hasData == 0 && del0) {
-                       /* Free and return NULL */
-
-                       yaffs_FreeTnode(dev, tn);
-                       tn = NULL;
-               }
-
-       }
-
-       return tn;
-
-}
-
-static int yaffs_PruneFileStructure(yaffs_Device *dev,
-                               yaffs_FileStructure *fStruct)
-{
-       int i;
-       int hasData;
-       int done = 0;
-       yaffs_Tnode *tn;
-
-       if (fStruct->topLevel > 0) {
-               fStruct->top =
-                   yaffs_PruneWorker(dev, fStruct->top, fStruct->topLevel, 0);
-
-               /* Now we have a tree with all the non-zero branches NULL but the height
-                * is the same as it was.
-                * Let's see if we can trim internal tnodes to shorten the tree.
-                * We can do this if only the 0th element in the tnode is in use
-                * (ie all the non-zero are NULL)
-                */
-
-               while (fStruct->topLevel && !done) {
-                       tn = fStruct->top;
-
-                       hasData = 0;
-                       for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
-                               if (tn->internal[i])
-                                       hasData++;
-                       }
-
-                       if (!hasData) {
-                               fStruct->top = tn->internal[0];
-                               fStruct->topLevel--;
-                               yaffs_FreeTnode(dev, tn);
-                       } else {
-                               done = 1;
-                       }
-               }
-       }
-
-       return YAFFS_OK;
-}
-
-/*-------------------- End of File Structure functions.-------------------*/
-
-/* yaffs_CreateFreeObjects creates a bunch more objects and
- * adds them to the object free list.
- */
-static int yaffs_CreateFreeObjects(yaffs_Device *dev, int nObjects)
-{
-       int i;
-       yaffs_Object *newObjects;
-       yaffs_ObjectList *list;
-
-       if (nObjects < 1)
-               return YAFFS_OK;
-
-       /* make these things */
-       newObjects = YMALLOC(nObjects * sizeof(yaffs_Object));
-       list = YMALLOC(sizeof(yaffs_ObjectList));
-
-       if (!newObjects || !list) {
-               if (newObjects){
-                       YFREE(newObjects);
-                       newObjects = NULL;
-               }
-               if (list){
-                       YFREE(list);
-                       list = NULL;
-               }
-               T(YAFFS_TRACE_ALLOCATE,
-                 (TSTR("yaffs: Could not allocate more objects" TENDSTR)));
-               return YAFFS_FAIL;
-       }
-
-       /* Hook them into the free list */
-       for (i = 0; i < nObjects - 1; i++) {
-               newObjects[i].siblings.next =
-                               (struct ylist_head *)(&newObjects[i + 1]);
-       }
-
-       newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects;
-       dev->freeObjects = newObjects;
-       dev->nFreeObjects += nObjects;
-       dev->nObjectsCreated += nObjects;
-
-       /* Now add this bunch of Objects to a list for freeing up. */
-
-       list->objects = newObjects;
-       list->next = dev->allocatedObjectList;
-       dev->allocatedObjectList = list;
-
-       return YAFFS_OK;
-}
-
-
-/* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */
-static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device *dev)
-{
-       yaffs_Object *tn = NULL;
-
-#ifdef CONFIG_YAFFS_VALGRIND_TEST
-       tn = YMALLOC(sizeof(yaffs_Object));
-       if(tn)
-               dev->nObjectsCreated++;
-#else
-       /* If there are none left make more */
-       if (!dev->freeObjects)
-               yaffs_CreateFreeObjects(dev, YAFFS_ALLOCATION_NOBJECTS);
-
-       if (dev->freeObjects) {
-               tn = dev->freeObjects;
-               dev->freeObjects =
-                       (yaffs_Object *) (dev->freeObjects->siblings.next);
-               dev->nFreeObjects--;
-       }
-#endif
-       if (tn) {
-               /* Now sweeten it up... */
-
-               memset(tn, 0, sizeof(yaffs_Object));
-               tn->beingCreated = 1;
-
-               tn->myDev = dev;
-               tn->hdrChunk = 0;
-               tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
-               YINIT_LIST_HEAD(&(tn->hardLinks));
-               YINIT_LIST_HEAD(&(tn->hashLink));
-               YINIT_LIST_HEAD(&tn->siblings);
-
-
-               /* Now make the directory sane */
-               if (dev->rootDir) {
-                       tn->parent = dev->rootDir;
-                       ylist_add(&(tn->siblings), &dev->rootDir->variant.directoryVariant.children);
-               }
-
-               /* Add it to the lost and found directory.
-                * NB Can't put root or lostNFound in lostNFound so
-                * check if lostNFound exists first
-                */
-               if (dev->lostNFoundDir)
-                       yaffs_AddObjectToDirectory(dev->lostNFoundDir, tn);
-
-               tn->beingCreated = 0;
-       }
-
-       dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
-
-       return tn;
-}
-
-static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device *dev, int number,
-                                              __u32 mode)
-{
-
-       yaffs_Object *obj =
-           yaffs_CreateNewObject(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
-       if (obj) {
-               obj->fake = 1;          /* it is fake so it might have no NAND presence... */
-               obj->renameAllowed = 0; /* ... and we're not allowed to rename it... */
-               obj->unlinkAllowed = 0; /* ... or unlink it */
-               obj->deleted = 0;
-               obj->unlinked = 0;
-               obj->yst_mode = mode;
-               obj->myDev = dev;
-               obj->hdrChunk = 0;      /* Not a valid chunk. */
-       }
-
-       return obj;
-
-}
-
-static void yaffs_UnhashObject(yaffs_Object *tn)
-{
-       int bucket;
-       yaffs_Device *dev = tn->myDev;
-
-       /* If it is still linked into the bucket list, free from the list */
-       if (!ylist_empty(&tn->hashLink)) {
-               ylist_del_init(&tn->hashLink);
-               bucket = yaffs_HashFunction(tn->objectId);
-               dev->objectBucket[bucket].count--;
-       }
-}
-
-/*  FreeObject frees up a Object and puts it back on the free list */
-static void yaffs_FreeObject(yaffs_Object *tn)
-{
-       yaffs_Device *dev = tn->myDev;
-
-       T(YAFFS_TRACE_OS, (TSTR("FreeObject %p inode %p"TENDSTR), tn, tn->myInode));
-
-       if (!tn)
-               YBUG();
-       if (tn->parent)
-               YBUG();
-       if (!ylist_empty(&tn->siblings))
-               YBUG();
-
-
-       if (tn->myInode) {
-               /* We're still hooked up to a cached inode.
-                * Don't delete now, but mark for later deletion
-                */
-               tn->deferedFree = 1;
-               return;
-       }
-
-       yaffs_UnhashObject(tn);
-
-#ifdef CONFIG_YAFFS_VALGRIND_TEST
-       YFREE(tn);
-       dev->nObjectsCreated--;
-       tn = NULL;
-#else
-       /* Link into the free list. */
-       tn->siblings.next = (struct ylist_head *)(dev->freeObjects);
-       dev->freeObjects = tn;
-       dev->nFreeObjects++;
-#endif
-       dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
-}
-
-
-void yaffs_HandleDeferedFree(yaffs_Object *obj)
-{
-       if (obj->deferedFree)
-               yaffs_FreeObject(obj);
-}
-
-
-static void yaffs_DeinitialiseObjects(yaffs_Device *dev)
-{
-       /* Free the list of allocated Objects */
-
-       yaffs_ObjectList *tmp;
-
-       while (dev->allocatedObjectList) {
-               tmp = dev->allocatedObjectList->next;
-               YFREE(dev->allocatedObjectList->objects);
-               YFREE(dev->allocatedObjectList);
-
-               dev->allocatedObjectList = tmp;
-       }
-
-       dev->freeObjects = NULL;
-       dev->nFreeObjects = 0;
-       dev->nObjectsCreated = 0;
-}
-
-static void yaffs_InitialiseObjects(yaffs_Device *dev)
-{
-       int i;
-
-       dev->allocatedObjectList = NULL;
-       dev->freeObjects = NULL;
-       dev->nFreeObjects = 0;
-
-       for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
-               YINIT_LIST_HEAD(&dev->objectBucket[i].list);
-               dev->objectBucket[i].count = 0;
-       }
-}
-
-static int yaffs_FindNiceObjectBucket(yaffs_Device *dev)
-{
-       int i;
-       int l = 999;
-       int lowest = 999999;
-
-
-       /* Search for the shortest list or one that
-        * isn't too long.
-        */
-
-       for (i = 0; i < 10 && lowest > 4; i++) {
-               dev->bucketFinder++;
-               dev->bucketFinder %= YAFFS_NOBJECT_BUCKETS;
-               if (dev->objectBucket[dev->bucketFinder].count < lowest) {
-                       lowest = dev->objectBucket[dev->bucketFinder].count;
-                       l = dev->bucketFinder;
-               }
-
-       }
-
-       return l;
-}
-
-static int yaffs_CreateNewObjectNumber(yaffs_Device *dev)
-{
-       int bucket = yaffs_FindNiceObjectBucket(dev);
-
-       /* Now find an object value that has not already been taken
-        * by scanning the list.
-        */
-
-       int found = 0;
-       struct ylist_head *i;
-
-       __u32 n = (__u32) bucket;
-
-       /* yaffs_CheckObjectHashSanity();  */
-
-       while (!found) {
-               found = 1;
-               n += YAFFS_NOBJECT_BUCKETS;
-               if (1 || dev->objectBucket[bucket].count > 0) {
-                       ylist_for_each(i, &dev->objectBucket[bucket].list) {
-                               /* If there is already one in the list */
-                               if (i && ylist_entry(i, yaffs_Object,
-                                               hashLink)->objectId == n) {
-                                       found = 0;
-                               }
-                       }
-               }
-       }
-
-       return n;
-}
-
-static void yaffs_HashObject(yaffs_Object *in)
-{
-       int bucket = yaffs_HashFunction(in->objectId);
-       yaffs_Device *dev = in->myDev;
-
-       ylist_add(&in->hashLink, &dev->objectBucket[bucket].list);
-       dev->objectBucket[bucket].count++;
-}
-
-yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device *dev, __u32 number)
-{
-       int bucket = yaffs_HashFunction(number);
-       struct ylist_head *i;
-       yaffs_Object *in;
-
-       ylist_for_each(i, &dev->objectBucket[bucket].list) {
-               /* Look if it is in the list */
-               if (i) {
-                       in = ylist_entry(i, yaffs_Object, hashLink);
-                       if (in->objectId == number) {
-
-                               /* Don't tell the VFS about this one if it is defered free */
-                               if (in->deferedFree)
-                                       return NULL;
-
-                               return in;
-                       }
-               }
-       }
-
-       return NULL;
-}
-
-yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev, int number,
-                                   yaffs_ObjectType type)
-{
-       yaffs_Object *theObject=NULL;
-       yaffs_Tnode *tn = NULL;
-
-       if (number < 0)
-               number = yaffs_CreateNewObjectNumber(dev);
-
-       if (type == YAFFS_OBJECT_TYPE_FILE) {
-               tn = yaffs_GetTnode(dev);
-               if (!tn)
-                       return NULL;
-       }
-
-       theObject = yaffs_AllocateEmptyObject(dev);
-       if (!theObject){
-               if(tn)
-                       yaffs_FreeTnode(dev,tn);
-               return NULL;
-       }
-
-
-       if (theObject) {
-               theObject->fake = 0;
-               theObject->renameAllowed = 1;
-               theObject->unlinkAllowed = 1;
-               theObject->objectId = number;
-               yaffs_HashObject(theObject);
-               theObject->variantType = type;
-#ifdef CONFIG_YAFFS_WINCE
-               yfsd_WinFileTimeNow(theObject->win_atime);
-               theObject->win_ctime[0] = theObject->win_mtime[0] =
-                   theObject->win_atime[0];
-               theObject->win_ctime[1] = theObject->win_mtime[1] =
-                   theObject->win_atime[1];
-
-#else
-
-               theObject->yst_atime = theObject->yst_mtime =
-                   theObject->yst_ctime = Y_CURRENT_TIME;
-#endif
-               switch (type) {
-               case YAFFS_OBJECT_TYPE_FILE:
-                       theObject->variant.fileVariant.fileSize = 0;
-                       theObject->variant.fileVariant.scannedFileSize = 0;
-                       theObject->variant.fileVariant.shrinkSize = 0xFFFFFFFF; /* max __u32 */
-                       theObject->variant.fileVariant.topLevel = 0;
-                       theObject->variant.fileVariant.top = tn;
-                       break;
-               case YAFFS_OBJECT_TYPE_DIRECTORY:
-                       YINIT_LIST_HEAD(&theObject->variant.directoryVariant.
-                                       children);
-                       YINIT_LIST_HEAD(&theObject->variant.directoryVariant.
-                                       dirty);
-                       break;
-               case YAFFS_OBJECT_TYPE_SYMLINK:
-               case YAFFS_OBJECT_TYPE_HARDLINK:
-               case YAFFS_OBJECT_TYPE_SPECIAL:
-                       /* No action required */
-                       break;
-               case YAFFS_OBJECT_TYPE_UNKNOWN:
-                       /* todo this should not happen */
-                       break;
-               }
-       }
-
-       return theObject;
-}
-
-static yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device *dev,
-                                                     int number,
-                                                     yaffs_ObjectType type)
-{
-       yaffs_Object *theObject = NULL;
-
-       if (number > 0)
-               theObject = yaffs_FindObjectByNumber(dev, number);
-
-       if (!theObject)
-               theObject = yaffs_CreateNewObject(dev, number, type);
-
-       return theObject;
-
-}
-
-
-static YCHAR *yaffs_CloneString(const YCHAR *str)
-{
-       YCHAR *newStr = NULL;
-       int len;
-
-       if (!str)
-               str = _Y("");
-
-       len = yaffs_strnlen(str,YAFFS_MAX_ALIAS_LENGTH);
-       newStr = YMALLOC((len + 1) * sizeof(YCHAR));
-       if (newStr){
-               yaffs_strncpy(newStr, str,len);
-               newStr[len] = 0;
-       }
-       return newStr;
-
-}
-
-/*
- * Mknod (create) a new object.
- * equivalentObject only has meaning for a hard link;
- * aliasString only has meaning for a symlink.
- * rdev only has meaning for devices (a subset of special objects)
- */
-
-static yaffs_Object *yaffs_MknodObject(yaffs_ObjectType type,
-                                      yaffs_Object *parent,
-                                      const YCHAR *name,
-                                      __u32 mode,
-                                      __u32 uid,
-                                      __u32 gid,
-                                      yaffs_Object *equivalentObject,
-                                      const YCHAR *aliasString, __u32 rdev)
-{
-       yaffs_Object *in;
-       YCHAR *str = NULL;
-
-       yaffs_Device *dev = parent->myDev;
-
-       /* Check if the entry exists. If it does then fail the call since we don't want a dup.*/
-       if (yaffs_FindObjectByName(parent, name))
-               return NULL;
-
-       if (type == YAFFS_OBJECT_TYPE_SYMLINK) {
-               str = yaffs_CloneString(aliasString);
-               if (!str)
-                       return NULL;
-       }
-
-       in = yaffs_CreateNewObject(dev, -1, type);
-
-       if (!in){
-               if(str)
-                       YFREE(str);
-               return NULL;
-       }
-
-
-
-
-
-       if (in) {
-               in->hdrChunk = 0;
-               in->valid = 1;
-               in->variantType = type;
-
-               in->yst_mode = mode;
-
-#ifdef CONFIG_YAFFS_WINCE
-               yfsd_WinFileTimeNow(in->win_atime);
-               in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
-               in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1];
-
-#else
-               in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME;
-
-               in->yst_rdev = rdev;
-               in->yst_uid = uid;
-               in->yst_gid = gid;
-#endif
-               in->nDataChunks = 0;
-
-               yaffs_SetObjectName(in, name);
-               in->dirty = 1;
-
-               yaffs_AddObjectToDirectory(parent, in);
-
-               in->myDev = parent->myDev;
-
-               switch (type) {
-               case YAFFS_OBJECT_TYPE_SYMLINK:
-                       in->variant.symLinkVariant.alias = str;
-                       break;
-               case YAFFS_OBJECT_TYPE_HARDLINK:
-                       in->variant.hardLinkVariant.equivalentObject =
-                               equivalentObject;
-                       in->variant.hardLinkVariant.equivalentObjectId =
-                               equivalentObject->objectId;
-                       ylist_add(&in->hardLinks, &equivalentObject->hardLinks);
-                       break;
-               case YAFFS_OBJECT_TYPE_FILE:
-               case YAFFS_OBJECT_TYPE_DIRECTORY:
-               case YAFFS_OBJECT_TYPE_SPECIAL:
-               case YAFFS_OBJECT_TYPE_UNKNOWN:
-                       /* do nothing */
-                       break;
-               }
-
-               if (yaffs_UpdateObjectHeader(in, name, 0, 0, 0) < 0) {
-                       /* Could not create the object header, fail the creation */
-                       yaffs_DeleteObject(in);
-                       in = NULL;
-               }
-
-               yaffs_UpdateParent(parent);
-       }
-
-       return in;
-}
-
-yaffs_Object *yaffs_MknodFile(yaffs_Object *parent, const YCHAR *name,
-                       __u32 mode, __u32 uid, __u32 gid)
-{
-       return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
-                               uid, gid, NULL, NULL, 0);
-}
-
-yaffs_Object *yaffs_MknodDirectory(yaffs_Object *parent, const YCHAR *name,
-                               __u32 mode, __u32 uid, __u32 gid)
-{
-       return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
-                                mode, uid, gid, NULL, NULL, 0);
-}
-
-yaffs_Object *yaffs_MknodSpecial(yaffs_Object *parent, const YCHAR *name,
-                               __u32 mode, __u32 uid, __u32 gid, __u32 rdev)
-{
-       return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
-                                uid, gid, NULL, NULL, rdev);
-}
-
-yaffs_Object *yaffs_MknodSymLink(yaffs_Object *parent, const YCHAR *name,
-                               __u32 mode, __u32 uid, __u32 gid,
-                               const YCHAR *alias)
-{
-       return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
-                               uid, gid, NULL, alias, 0);
-}
-
-/* yaffs_Link returns the object id of the equivalent object.*/
-yaffs_Object *yaffs_Link(yaffs_Object *parent, const YCHAR *name,
-                       yaffs_Object *equivalentObject)
-{
-       /* Get the real object in case we were fed a hard link as an equivalent object */
-       equivalentObject = yaffs_GetEquivalentObject(equivalentObject);
-
-       if (yaffs_MknodObject
-           (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0,
-            equivalentObject, NULL, 0)) {
-               return equivalentObject;
-       } else {
-               return NULL;
-       }
-
-}
-
-static int yaffs_ChangeObjectName(yaffs_Object *obj, yaffs_Object *newDir,
-                               const YCHAR *newName, int force, int shadows)
-{
-       int unlinkOp;
-       int deleteOp;
-
-       yaffs_Object *existingTarget;
-
-       if (newDir == NULL)
-               newDir = obj->parent;   /* use the old directory */
-
-       if (newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
-               T(YAFFS_TRACE_ALWAYS,
-                 (TSTR
-                  ("tragedy: yaffs_ChangeObjectName: newDir is not a directory"
-                   TENDSTR)));
-               YBUG();
-       }
-
-       /* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */
-       if (obj->myDev->param.isYaffs2)
-               unlinkOp = (newDir == obj->myDev->unlinkedDir);
-       else
-               unlinkOp = (newDir == obj->myDev->unlinkedDir
-                           && obj->variantType == YAFFS_OBJECT_TYPE_FILE);
-
-       deleteOp = (newDir == obj->myDev->deletedDir);
-
-       existingTarget = yaffs_FindObjectByName(newDir, newName);
-
-       /* If the object is a file going into the unlinked directory,
-        *   then it is OK to just stuff it in since duplicate names are allowed.
-        *   else only proceed if the new name does not exist and if we're putting
-        *   it into a directory.
-        */
-       if ((unlinkOp ||
-            deleteOp ||
-            force ||
-            (shadows > 0) ||
-            !existingTarget) &&
-           newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) {
-               yaffs_SetObjectName(obj, newName);
-               obj->dirty = 1;
-
-               yaffs_AddObjectToDirectory(newDir, obj);
-
-               if (unlinkOp)
-                       obj->unlinked = 1;
-
-               /* If it is a deletion then we mark it as a shrink for gc purposes. */
-               if (yaffs_UpdateObjectHeader(obj, newName, 0, deleteOp, shadows) >= 0)
-                       return YAFFS_OK;
-       }
-
-       return YAFFS_FAIL;
-}
-
-int yaffs_RenameObject(yaffs_Object *oldDir, const YCHAR *oldName,
-               yaffs_Object *newDir, const YCHAR *newName)
-{
-       yaffs_Object *obj = NULL;
-       yaffs_Object *existingTarget = NULL;
-       int force = 0;
-       int result;
-       yaffs_Device *dev;
-
-
-       if (!oldDir || oldDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
-               YBUG();
-       if (!newDir || newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
-               YBUG();
-
-       dev = oldDir->myDev;
-
-#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
-       /* Special case for case insemsitive systems (eg. WinCE).
-        * While look-up is case insensitive, the name isn't.
-        * Therefore we might want to change x.txt to X.txt
-       */
-       if (oldDir == newDir && yaffs_strcmp(oldName, newName) == 0)
-               force = 1;
-#endif
-
-       if(yaffs_strnlen(newName,YAFFS_MAX_NAME_LENGTH+1) > YAFFS_MAX_NAME_LENGTH)
-               /* ENAMETOOLONG */
-               return YAFFS_FAIL;
-
-       obj = yaffs_FindObjectByName(oldDir, oldName);
-
-       if (obj && obj->renameAllowed) {
-
-               /* Now do the handling for an existing target, if there is one */
-
-               existingTarget = yaffs_FindObjectByName(newDir, newName);
-               if (existingTarget &&
-                       existingTarget->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
-                       !ylist_empty(&existingTarget->variant.directoryVariant.children)) {
-                       /* There is a target that is a non-empty directory, so we fail */
-                       return YAFFS_FAIL;      /* EEXIST or ENOTEMPTY */
-               } else if (existingTarget && existingTarget != obj) {
-                       /* Nuke the target first, using shadowing,
-                        * but only if it isn't the same object.
-                        *
-                        * Note we must disable gc otherwise it can mess up the shadowing.
-                        *
-                        */
-                       dev->isDoingGC=1;
-                       yaffs_ChangeObjectName(obj, newDir, newName, force,
-                                               existingTarget->objectId);
-                       existingTarget->isShadowed = 1;
-                       yaffs_UnlinkObject(existingTarget);
-                       dev->isDoingGC=0;
-               }
-
-               result = yaffs_ChangeObjectName(obj, newDir, newName, 1, 0);
-
-               yaffs_UpdateParent(oldDir);
-               if(newDir != oldDir)
-                       yaffs_UpdateParent(newDir);
-               
-               return result;
-       }
-       return YAFFS_FAIL;
-}
-
-/*------------------------- Block Management and Page Allocation ----------------*/
-
-static int yaffs_InitialiseBlocks(yaffs_Device *dev)
-{
-       int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
-
-       dev->blockInfo = NULL;
-       dev->chunkBits = NULL;
-
-       dev->allocationBlock = -1;      /* force it to get a new one */
-
-       /* If the first allocation strategy fails, thry the alternate one */
-       dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
-       if (!dev->blockInfo) {
-               dev->blockInfo = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockInfo));
-               dev->blockInfoAlt = 1;
-       } else
-               dev->blockInfoAlt = 0;
-
-       if (dev->blockInfo) {
-               /* Set up dynamic blockinfo stuff. */
-               dev->chunkBitmapStride = (dev->param.nChunksPerBlock + 7) / 8; /* round up bytes */
-               dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks);
-               if (!dev->chunkBits) {
-                       dev->chunkBits = YMALLOC_ALT(dev->chunkBitmapStride * nBlocks);
-                       dev->chunkBitsAlt = 1;
-               } else
-                       dev->chunkBitsAlt = 0;
-       }
-
-       if (dev->blockInfo && dev->chunkBits) {
-               memset(dev->blockInfo, 0, nBlocks * sizeof(yaffs_BlockInfo));
-               memset(dev->chunkBits, 0, dev->chunkBitmapStride * nBlocks);
-               return YAFFS_OK;
-       }
-
-       return YAFFS_FAIL;
-}
-
-static void yaffs_DeinitialiseBlocks(yaffs_Device *dev)
-{
-       if (dev->blockInfoAlt && dev->blockInfo)
-               YFREE_ALT(dev->blockInfo);
-       else if (dev->blockInfo)
-               YFREE(dev->blockInfo);
-
-       dev->blockInfoAlt = 0;
-
-       dev->blockInfo = NULL;
-
-       if (dev->chunkBitsAlt && dev->chunkBits)
-               YFREE_ALT(dev->chunkBits);
-       else if (dev->chunkBits)
-               YFREE(dev->chunkBits);
-       dev->chunkBitsAlt = 0;
-       dev->chunkBits = NULL;
-}
-
-static int yaffs_BlockNotDisqualifiedFromGC(yaffs_Device *dev,
-                                       yaffs_BlockInfo *bi)
-{
-
-       if (!dev->param.isYaffs2)
-               return 1;       /* disqualification only applies to yaffs2. */
-
-       if (!bi->hasShrinkHeader)
-               return 1;       /* can gc */
-
-       yaffs_FindOldestDirtySequence(dev);
-
-       /* Can't do gc of this block if there are any blocks older than this one that have
-        * discarded pages.
-        */
-       return (bi->sequenceNumber <= dev->oldestDirtySequence);
-}
-
-/*
- * yaffs_FindRefreshBlock()
- * periodically finds the oldest full block by sequence number for refreshing.
- * Only for yaffs2.
- */
-static __u32 yaffs_FindRefreshBlock(yaffs_Device *dev)
-{
-       __u32 b ;
-
-       __u32 oldest = 0;
-       __u32 oldestSequence = 0;
-
-       yaffs_BlockInfo *bi;
-
-       /*
-        * If refresh period < 10 then refreshing is disabled.
-        */
-       if(dev->param.refreshPeriod < 10 ||
-               !dev->param.isYaffs2)
-               return oldest;
-
-        /*
-         * Fix broken values.
-         */
-        if(dev->refreshSkip > dev->param.refreshPeriod)
-                dev->refreshSkip = dev->param.refreshPeriod;
-
-       if(dev->refreshSkip > 0){
-               dev->refreshSkip--;
-               return oldest;
-       }
-
-       /*
-        * Refresh skip is now zero.
-        * We'll do a refresh this time around....
-        * Update the refresh skip and find the oldest block.
-        */
-       dev->refreshSkip = dev->param.refreshPeriod;
-       dev->refreshCount++;
-       bi = dev->blockInfo;
-       for (b = dev->internalStartBlock; b <=dev->internalEndBlock; b++){
-
-               if (bi->blockState == YAFFS_BLOCK_STATE_FULL){
-
-                       if(oldest < 1 ||
-                                bi->sequenceNumber < oldestSequence){
-                                oldest = b;
-                                oldestSequence = bi->sequenceNumber;
-                        }
-               }
-               bi++;
-       }
-
-       if (oldest > 0) {
-               T(YAFFS_TRACE_GC,
-                 (TSTR("GC refresh count %d selected block %d with sequenceNumber %d" TENDSTR),
-                  dev->refreshCount, oldest, oldestSequence));
-       }
-
-       return oldest;
-}
-
-/*
- * FindDiretiestBlock is used to select the dirtiest block (or close enough)
- * for garbage collection.
- */
-
-static int yaffs_FindBlockForGarbageCollection(yaffs_Device *dev,
-                                       int aggressive)
-{
-       int b = dev->currentDirtyChecker;
-
-       int i;
-       int iterations;
-       int dirtiest = -1;
-       int pagesInUse = 0;
-       int prioritised = 0;
-       yaffs_BlockInfo *bi;
-       int pendingPrioritisedExist = 0;
-
-       /* First let's see if we need to grab a prioritised block */
-       if (dev->hasPendingPrioritisedGCs) {
-               bi = dev->blockInfo;
-               for (i = dev->internalStartBlock; i < dev->internalEndBlock && !prioritised; i++) {
-
-                       if (bi->gcPrioritise) {
-                               pendingPrioritisedExist = 1;
-                               if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
-                                  yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
-                                       pagesInUse = (bi->pagesInUse - bi->softDeletions);
-                                       dirtiest = i;
-                                       prioritised = 1;
-                                       aggressive = 1; /* Fool the non-aggressive skip logiv below */
-                               }
-                       }
-                       bi++;
-               }
-
-               if (!pendingPrioritisedExist) /* None found, so we can clear this */
-                       dev->hasPendingPrioritisedGCs = 0;
-       }
-
-       /* If we're doing aggressive GC then we are happy to take a less-dirty block, and
-        * search harder.
-        * else (we're doing a leasurely gc), then we only bother to do this if the
-        * block has only a few pages in use.
-        */
-
-       dev->nonAggressiveSkip--;
-
-       if (!aggressive && (dev->nonAggressiveSkip > 0))
-               return -1;
-
-       if (!prioritised)
-               pagesInUse =
-                       (aggressive) ? dev->param.nChunksPerBlock : YAFFS_PASSIVE_GC_CHUNKS + 1;
-
-       if (aggressive)
-               iterations =
-                   dev->internalEndBlock - dev->internalStartBlock + 1;
-       else {
-               iterations =
-                   dev->internalEndBlock - dev->internalStartBlock + 1;
-               iterations = iterations / 16;
-               if (iterations > 200)
-                       iterations = 200;
-       }
-
-       for (i = 0; i <= iterations && pagesInUse > 0 && !prioritised; i++) {
-               b++;
-               if (b < dev->internalStartBlock || b > dev->internalEndBlock)
-                       b = dev->internalStartBlock;
-
-               if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
-                       T(YAFFS_TRACE_ERROR,
-                         (TSTR("**>> Block %d is not valid" TENDSTR), b));
-                       YBUG();
-               }
-
-               bi = yaffs_GetBlockInfo(dev, b);
-
-               if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
-                       (bi->pagesInUse - bi->softDeletions) < pagesInUse &&
-                               yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
-                       dirtiest = b;
-                       pagesInUse = (bi->pagesInUse - bi->softDeletions);
-               }
-       }
-
-       dev->currentDirtyChecker = b;
-
-       if (dirtiest > 0) {
-               T(YAFFS_TRACE_GC,
-                 (TSTR("GC Selected block %d with %d free, prioritised:%d" TENDSTR), dirtiest,
-                  dev->param.nChunksPerBlock - pagesInUse, prioritised));
-       }
-
-       if (dirtiest > 0)
-               dev->nonAggressiveSkip = 4;
-
-       return dirtiest;
-}
-
-static void yaffs_BlockBecameDirty(yaffs_Device *dev, int blockNo)
-{
-       yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockNo);
-
-       int erasedOk = 0;
-
-       /* If the block is still healthy erase it and mark as clean.
-        * If the block has had a data failure, then retire it.
-        */
-
-       T(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
-               (TSTR("yaffs_BlockBecameDirty block %d state %d %s"TENDSTR),
-               blockNo, bi->blockState, (bi->needsRetiring) ? "needs retiring" : ""));
-
-       yaffs_ClearOldestDirtySequence(dev,bi);
-
-       bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
-
-       if (!bi->needsRetiring) {
-               yaffs_InvalidateCheckpoint(dev);
-               erasedOk = yaffs_EraseBlockInNAND(dev, blockNo);
-               if (!erasedOk) {
-                       dev->nErasureFailures++;
-                       T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
-                         (TSTR("**>> Erasure failed %d" TENDSTR), blockNo));
-               }
-       }
-
-       if (erasedOk &&
-           ((yaffs_traceMask & YAFFS_TRACE_ERASE) || !yaffs_SkipVerification(dev))) {
-               int i;
-               for (i = 0; i < dev->param.nChunksPerBlock; i++) {
-                       if (!yaffs_CheckChunkErased
-                           (dev, blockNo * dev->param.nChunksPerBlock + i)) {
-                               T(YAFFS_TRACE_ERROR,
-                                 (TSTR
-                                  (">>Block %d erasure supposedly OK, but chunk %d not erased"
-                                   TENDSTR), blockNo, i));
-                       }
-               }
-       }
-
-       if (erasedOk) {
-               /* Clean it up... */
-               bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
-               bi->sequenceNumber = 0;
-               dev->nErasedBlocks++;
-               bi->pagesInUse = 0;
-               bi->softDeletions = 0;
-               bi->hasShrinkHeader = 0;
-               bi->skipErasedCheck = 1;  /* This is clean, so no need to check */
-               bi->gcPrioritise = 0;
-               yaffs_ClearChunkBits(dev, blockNo);
-
-               T(YAFFS_TRACE_ERASE,
-                 (TSTR("Erased block %d" TENDSTR), blockNo));
-       } else {
-               dev->nFreeChunks -= dev->param.nChunksPerBlock; /* We lost a block of free space */
-
-               yaffs_RetireBlock(dev, blockNo);
-               T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
-                 (TSTR("**>> Block %d retired" TENDSTR), blockNo));
-       }
-}
-
-static int yaffs_FindBlockForAllocation(yaffs_Device *dev)
-{
-       int i;
-
-       yaffs_BlockInfo *bi;
-
-       if (dev->nErasedBlocks < 1) {
-               /* Hoosterman we've got a problem.
-                * Can't get space to gc
-                */
-               T(YAFFS_TRACE_ERROR,
-                 (TSTR("yaffs tragedy: no more erased blocks" TENDSTR)));
-
-               return -1;
-       }
-
-       /* Find an empty block. */
-
-       for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
-               dev->allocationBlockFinder++;
-               if (dev->allocationBlockFinder < dev->internalStartBlock
-                   || dev->allocationBlockFinder > dev->internalEndBlock) {
-                       dev->allocationBlockFinder = dev->internalStartBlock;
-               }
-
-               bi = yaffs_GetBlockInfo(dev, dev->allocationBlockFinder);
-
-               if (bi->blockState == YAFFS_BLOCK_STATE_EMPTY) {
-                       bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING;
-                       dev->sequenceNumber++;
-                       bi->sequenceNumber = dev->sequenceNumber;
-                       dev->nErasedBlocks--;
-                       T(YAFFS_TRACE_ALLOCATE,
-                         (TSTR("Allocated block %d, seq  %d, %d left" TENDSTR),
-                          dev->allocationBlockFinder, dev->sequenceNumber,
-                          dev->nErasedBlocks));
-                       return dev->allocationBlockFinder;
-               }
-       }
-
-       T(YAFFS_TRACE_ALWAYS,
-         (TSTR
-          ("yaffs tragedy: no more erased blocks, but there should have been %d"
-           TENDSTR), dev->nErasedBlocks));
-
-       return -1;
-}
-
-
-
-static int yaffs_CalcCheckpointBlocksRequired(yaffs_Device *dev)
-{
-       if (!dev->nCheckpointBlocksRequired &&
-          dev->param.isYaffs2) {
-               /* Not a valid value so recalculate */
-               int nBytes = 0;
-               int nBlocks;
-               int devBlocks = (dev->param.endBlock - dev->param.startBlock + 1);
-               int tnodeSize = yaffs_CalcTnodeSize(dev);
-
-               nBytes += sizeof(yaffs_CheckpointValidity);
-               nBytes += sizeof(yaffs_CheckpointDevice);
-               nBytes += devBlocks * sizeof(yaffs_BlockInfo);
-               nBytes += devBlocks * dev->chunkBitmapStride;
-               nBytes += (sizeof(yaffs_CheckpointObject) + sizeof(__u32)) * (dev->nObjectsCreated - dev->nFreeObjects);
-               nBytes += (tnodeSize + sizeof(__u32)) * (dev->nTnodesCreated - dev->nFreeTnodes);
-               nBytes += sizeof(yaffs_CheckpointValidity);
-               nBytes += sizeof(__u32); /* checksum*/
-
-               /* Round up and add 2 blocks to allow for some bad blocks, so add 3 */
-
-               nBlocks = (nBytes/(dev->nDataBytesPerChunk * dev->param.nChunksPerBlock)) + 3;
-
-               dev->nCheckpointBlocksRequired = nBlocks;
-       }
-
-       return dev->nCheckpointBlocksRequired;
-}
-
-/*
- * Check if there's space to allocate...
- * Thinks.... do we need top make this ths same as yaffs_GetFreeChunks()?
- */
-static int yaffs_CheckSpaceForAllocation(yaffs_Device *dev, int nChunks)
-{
-       int reservedChunks;
-       int reservedBlocks = dev->param.nReservedBlocks;
-       int checkpointBlocks;
-
-       if (dev->param.isYaffs2) {
-               checkpointBlocks =  yaffs_CalcCheckpointBlocksRequired(dev) -
-                                   dev->blocksInCheckpoint;
-               if (checkpointBlocks < 0)
-                       checkpointBlocks = 0;
-       } else {
-               checkpointBlocks = 0;
-       }
-
-       reservedChunks = ((reservedBlocks + checkpointBlocks) * dev->param.nChunksPerBlock);
-
-       return (dev->nFreeChunks > (reservedChunks + nChunks));
-}
-
-static int yaffs_AllocateChunk(yaffs_Device *dev, int useReserve,
-               yaffs_BlockInfo **blockUsedPtr)
-{
-       int retVal;
-       yaffs_BlockInfo *bi;
-
-       if (dev->allocationBlock < 0) {
-               /* Get next block to allocate off */
-               dev->allocationBlock = yaffs_FindBlockForAllocation(dev);
-               dev->allocationPage = 0;
-       }
-
-       if (!useReserve && !yaffs_CheckSpaceForAllocation(dev, 1)) {
-               /* Not enough space to allocate unless we're allowed to use the reserve. */
-               return -1;
-       }
-
-       if (dev->nErasedBlocks < dev->param.nReservedBlocks
-                       && dev->allocationPage == 0) {
-               T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR)));
-       }
-
-       /* Next page please.... */
-       if (dev->allocationBlock >= 0) {
-               bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
-
-               retVal = (dev->allocationBlock * dev->param.nChunksPerBlock) +
-                       dev->allocationPage;
-               bi->pagesInUse++;
-               yaffs_SetChunkBit(dev, dev->allocationBlock,
-                               dev->allocationPage);
-
-               dev->allocationPage++;
-
-               dev->nFreeChunks--;
-
-               /* If the block is full set the state to full */
-               if (dev->allocationPage >= dev->param.nChunksPerBlock) {
-                       bi->blockState = YAFFS_BLOCK_STATE_FULL;
-                       dev->allocationBlock = -1;
-               }
-
-               if (blockUsedPtr)
-                       *blockUsedPtr = bi;
-
-               return retVal;
-       }
-
-       T(YAFFS_TRACE_ERROR,
-                       (TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
-
-       return -1;
-}
-
-static int yaffs_GetErasedChunks(yaffs_Device *dev)
-{
-       int n;
-
-       n = dev->nErasedBlocks * dev->param.nChunksPerBlock;
-
-       if (dev->allocationBlock > 0)
-               n += (dev->param.nChunksPerBlock - dev->allocationPage);
-
-       return n;
-
-}
-
-/*
- * yaffs_SkipRestOfBlock() skips over the rest of the allocation block
- * if we don't want to write to it.
- */
-static void yaffs_SkipRestOfBlock(yaffs_Device *dev)
-{
-       if(dev->allocationBlock > 0){
-               yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
-               if(bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING){
-                       bi->blockState = YAFFS_BLOCK_STATE_FULL;
-                       dev->allocationBlock = -1;
-               }
-       }
-}
-
-
-static int yaffs_GarbageCollectBlock(yaffs_Device *dev, int block,
-               int wholeBlock)
-{
-       int oldChunk;
-       int newChunk;
-       int markNAND;
-       int retVal = YAFFS_OK;
-       int cleanups = 0;
-       int i;
-       int isCheckpointBlock;
-       int matchingChunk;
-       int maxCopies;
-
-       int chunksBefore = yaffs_GetErasedChunks(dev);
-       int chunksAfter;
-
-       yaffs_ExtendedTags tags;
-
-       yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, block);
-
-       yaffs_Object *object;
-
-       isCheckpointBlock = (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT);
-
-
-       T(YAFFS_TRACE_TRACING,
-                       (TSTR("Collecting block %d, in use %d, shrink %d, wholeBlock %d" TENDSTR),
-                        block,
-                        bi->pagesInUse,
-                        bi->hasShrinkHeader,
-                        wholeBlock));
-
-       /*yaffs_VerifyFreeChunks(dev); */
-
-       if(bi->blockState == YAFFS_BLOCK_STATE_FULL)
-               bi->blockState = YAFFS_BLOCK_STATE_COLLECTING;
-       
-       bi->hasShrinkHeader = 0;        /* clear the flag so that the block can erase */
-
-       /* Take off the number of soft deleted entries because
-        * they're going to get really deleted during GC.
-        */
-       if(dev->gcChunk == 0) /* first time through for this block */
-               dev->nFreeChunks -= bi->softDeletions;
-
-       dev->isDoingGC = 1;
-
-       if (isCheckpointBlock ||
-                       !yaffs_StillSomeChunkBits(dev, block)) {
-               T(YAFFS_TRACE_TRACING,
-                               (TSTR
-                                ("Collecting block %d that has no chunks in use" TENDSTR),
-                                block));
-               yaffs_BlockBecameDirty(dev, block);
-       } else {
-
-               __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
-
-               yaffs_VerifyBlock(dev, bi, block);
-
-               maxCopies = (wholeBlock) ? dev->param.nChunksPerBlock : 10;
-               oldChunk = block * dev->param.nChunksPerBlock + dev->gcChunk;
-
-               for (/* init already done */;
-                    retVal == YAFFS_OK &&
-                    dev->gcChunk < dev->param.nChunksPerBlock &&
-                    (bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) &&
-                    maxCopies > 0;
-                    dev->gcChunk++, oldChunk++) {
-                       if (yaffs_CheckChunkBit(dev, block, dev->gcChunk)) {
-
-                               /* This page is in use and might need to be copied off */
-
-                               maxCopies--;
-
-                               markNAND = 1;
-
-                               yaffs_InitialiseTags(&tags);
-
-                               yaffs_ReadChunkWithTagsFromNAND(dev, oldChunk,
-                                                               buffer, &tags);
-
-                               object =
-                                   yaffs_FindObjectByNumber(dev,
-                                                            tags.objectId);
-
-                               T(YAFFS_TRACE_GC_DETAIL,
-                                 (TSTR
-                                  ("Collecting chunk in block %d, %d %d %d " TENDSTR),
-                                  dev->gcChunk, tags.objectId, tags.chunkId,
-                                  tags.byteCount));
-
-                               if (object && !yaffs_SkipVerification(dev)) {
-                                       if (tags.chunkId == 0)
-                                               matchingChunk = object->hdrChunk;
-                                       else if (object->softDeleted)
-                                               matchingChunk = oldChunk; /* Defeat the test */
-                                       else
-                                               matchingChunk = yaffs_FindChunkInFile(object, tags.chunkId, NULL);
-
-                                       if (oldChunk != matchingChunk)
-                                               T(YAFFS_TRACE_ERROR,
-                                                 (TSTR("gc: page in gc mismatch: %d %d %d %d"TENDSTR),
-                                                 oldChunk, matchingChunk, tags.objectId, tags.chunkId));
-
-                               }
-
-                               if (!object) {
-                                       T(YAFFS_TRACE_ERROR,
-                                         (TSTR
-                                          ("page %d in gc has no object: %d %d %d "
-                                           TENDSTR), oldChunk,
-                                           tags.objectId, tags.chunkId, tags.byteCount));
-                               }
-
-                               if (object &&
-                                   object->deleted &&
-                                   object->softDeleted &&
-                                   tags.chunkId != 0) {
-                                       /* Data chunk in a soft deleted file, throw it away
-                                        * It's a soft deleted data chunk,
-                                        * No need to copy this, just forget about it and
-                                        * fix up the object.
-                                        */
-
-                                       object->nDataChunks--;
-
-                                       if (object->nDataChunks <= 0) {
-                                               /* remeber to clean up the object */
-                                               dev->gcCleanupList[cleanups] =
-                                                   tags.objectId;
-                                               cleanups++;
-                                       }
-                                       markNAND = 0;
-                               } else if (0) {
-                                       /* Todo object && object->deleted && object->nDataChunks == 0 */
-                                       /* Deleted object header with no data chunks.
-                                        * Can be discarded and the file deleted.
-                                        */
-                                       object->hdrChunk = 0;
-                                       yaffs_FreeTnode(object->myDev,
-                                                       object->variant.
-                                                       fileVariant.top);
-                                       object->variant.fileVariant.top = NULL;
-                                       yaffs_DoGenericObjectDeletion(object);
-
-                               } else if (object) {
-                                       /* It's either a data chunk in a live file or
-                                        * an ObjectHeader, so we're interested in it.
-                                        * NB Need to keep the ObjectHeaders of deleted files
-                                        * until the whole file has been deleted off
-                                        */
-                                       tags.serialNumber++;
-
-                                       dev->nGCCopies++;
-
-                                       if (tags.chunkId == 0) {
-                                               /* It is an object Id,
-                                                * We need to nuke the shrinkheader flags first
-                                                * Also need to clean up shadowing.
-                                                * We no longer want the shrinkHeader flag since its work is done
-                                                * and if it is left in place it will mess up scanning.
-                                                */
-
-                                               yaffs_ObjectHeader *oh;
-                                               oh = (yaffs_ObjectHeader *)buffer;
-
-                                               oh->isShrink = 0;
-                                               tags.extraIsShrinkHeader = 0;
-
-                                               oh->shadowsObject = 0;
-                                               oh->inbandShadowsObject = 0;
-                                               tags.extraShadows = 0;
-
-                                               /* Update file size */
-                                               if(object->variantType == YAFFS_OBJECT_TYPE_FILE){
-                                                       oh->fileSize = object->variant.fileVariant.fileSize;
-                                                       tags.extraFileLength = oh->fileSize;
-                                               }
-
-                                               yaffs_VerifyObjectHeader(object, oh, &tags, 1);
-                                               newChunk =
-                                                   yaffs_WriteNewChunkWithTagsToNAND(dev,(__u8 *) oh, &tags, 1);
-                                       } else
-                                               newChunk =
-                                                   yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &tags, 1);
-
-                                       if (newChunk < 0) {
-                                               retVal = YAFFS_FAIL;
-                                       } else {
-
-                                               /* Ok, now fix up the Tnodes etc. */
-
-                                               if (tags.chunkId == 0) {
-                                                       /* It's a header */
-                                                       object->hdrChunk =  newChunk;
-                                                       object->serial =   tags.serialNumber;
-                                               } else {
-                                                       /* It's a data chunk */
-                                                       int ok;
-                                                       ok = yaffs_PutChunkIntoFile
-                                                           (object,
-                                                            tags.chunkId,
-                                                            newChunk, 0);
-                                               }
-                                       }
-                               }
-
-                               if (retVal == YAFFS_OK)
-                                       yaffs_DeleteChunk(dev, oldChunk, markNAND, __LINE__);
-
-                       }
-               }
-
-               yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
-
-
-               /* Do any required cleanups */
-               for (i = 0; i < cleanups; i++) {
-                       /* Time to delete the file too */
-                       object =
-                           yaffs_FindObjectByNumber(dev,
-                                                    dev->gcCleanupList[i]);
-                       if (object) {
-                               yaffs_FreeTnode(dev,
-                                               object->variant.fileVariant.
-                                               top);
-                               object->variant.fileVariant.top = NULL;
-                               T(YAFFS_TRACE_GC,
-                                 (TSTR
-                                  ("yaffs: About to finally delete object %d"
-                                   TENDSTR), object->objectId));
-                               yaffs_DoGenericObjectDeletion(object);
-                               object->myDev->nDeletedFiles--;
-                       }
-
-               }
-
-       }
-
-       yaffs_VerifyCollectedBlock(dev, bi, block);
-
-
-
-       /* If the gc completed then clear the current gcBlock so that we find another. */
-       if (bi->blockState != YAFFS_BLOCK_STATE_COLLECTING) {
-               chunksAfter = yaffs_GetErasedChunks(dev);
-               if (chunksBefore >= chunksAfter) {
-                       T(YAFFS_TRACE_GC,
-                         (TSTR
-                          ("gc did not increase free chunks before %d after %d"
-                           TENDSTR), chunksBefore, chunksAfter));
-               }
-               dev->gcBlock = -1;
-               dev->gcChunk = 0;
-       }
-
-       dev->isDoingGC = 0;
-
-       return retVal;
-}
-
-/* New garbage collector
- * If we're very low on erased blocks then we do aggressive garbage collection
- * otherwise we do "leasurely" garbage collection.
- * Aggressive gc looks further (whole array) and will accept less dirty blocks.
- * Passive gc only inspects smaller areas and will only accept more dirty blocks.
- *
- * The idea is to help clear out space in a more spread-out manner.
- * Dunno if it really does anything useful.
- */
-static int yaffs_CheckGarbageCollection(yaffs_Device *dev)
-{
-       int block;
-       int aggressive;
-       int gcOk = YAFFS_OK;
-       int maxTries = 0;
-
-       int checkpointBlockAdjust;
-
-       if(dev->param.gcControl &&
-               (dev->param.gcControl(dev) & 1) == 0)
-               return YAFFS_OK;
-
-       if (dev->isDoingGC) {
-               /* Bail out so we don't get recursive gc */
-               return YAFFS_OK;
-       }
-
-       /* This loop should pass the first time.
-        * We'll only see looping here if the erase of the collected block fails.
-        */
-
-       do {
-               maxTries++;
-
-               checkpointBlockAdjust = yaffs_CalcCheckpointBlocksRequired(dev) - dev->blocksInCheckpoint;
-               if (checkpointBlockAdjust < 0)
-                       checkpointBlockAdjust = 0;
-
-               /* If we need a block soon then do aggressive gc.*/
-               if (dev->nErasedBlocks < (dev->param.nReservedBlocks + checkpointBlockAdjust + 2))
-                       aggressive = 1;
-               else
-                       aggressive = 0;
-
-                /* If we don't already have a block being gc'd then see if we should start another */
-
-               if (dev->gcBlock < 1 && !aggressive) {
-                       dev->gcBlock = yaffs_FindRefreshBlock(dev);
-                       dev->gcChunk = 0;
-               }
-               if (dev->gcBlock < 1) {
-                       dev->gcBlock = yaffs_FindBlockForGarbageCollection(dev, aggressive);
-                       dev->gcChunk = 0;
-               }
-
-               block = dev->gcBlock;
-
-               if (block > 0) {
-                       dev->garbageCollections++;
-                       if (!aggressive)
-                               dev->passiveGarbageCollections++;
-
-                       T(YAFFS_TRACE_GC,
-                         (TSTR
-                          ("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),
-                          dev->nErasedBlocks, aggressive));
-
-                       gcOk = yaffs_GarbageCollectBlock(dev, block, aggressive);
-               }
-
-               if (dev->nErasedBlocks < (dev->param.nReservedBlocks) && block > 0) {
-                       T(YAFFS_TRACE_GC,
-                         (TSTR
-                          ("yaffs: GC !!!no reclaim!!! erasedBlocks %d after try %d block %d"
-                           TENDSTR), dev->nErasedBlocks, maxTries, block));
-               }
-       } while ((dev->nErasedBlocks < dev->param.nReservedBlocks) &&
-                (block > 0) &&
-                (maxTries < 2));
-
-       return aggressive ? gcOk : YAFFS_OK;
-}
-
-/*-------------------------  TAGS --------------------------------*/
-
-static int yaffs_TagsMatch(const yaffs_ExtendedTags *tags, int objectId,
-                          int chunkInObject)
-{
-       return (tags->chunkId == chunkInObject &&
-               tags->objectId == objectId && !tags->chunkDeleted) ? 1 : 0;
+       val &= dev->tnode_mask;
+       val <<= dev->chunk_grp_bits;
 
+       return val;
 }
 
+/* ------------------- End of individual tnode manipulation -----------------*/
 
-/*-------------------- Data file manipulation -----------------*/
+/* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
+ * The look up tree is represented by the top tnode and the number of top_level
+ * in the tree. 0 means only the level 0 tnode is in the tree.
+ */
 
-static int yaffs_FindChunkInFile(yaffs_Object *in, int chunkInInode,
-                                yaffs_ExtendedTags *tags)
+/* FindLevel0Tnode finds the level 0 tnode, if one exists. */
+struct yaffs_tnode *yaffs_find_tnode_0(struct yaffs_dev *dev,
+                                      struct yaffs_file_var *file_struct,
+                                      u32 chunk_id)
 {
-       /*Get the Tnode, then get the level 0 offset chunk offset */
-       yaffs_Tnode *tn;
-       int theChunk = -1;
-       yaffs_ExtendedTags localTags;
-       int retVal = -1;
+       struct yaffs_tnode *tn = file_struct->top;
+       u32 i;
+       int required_depth;
+       int level = file_struct->top_level;
 
-       yaffs_Device *dev = in->myDev;
+       dev = dev;
 
-       if (!tags) {
-               /* Passed a NULL, so use our own tags space */
-               tags = &localTags;
-       }
-
-       tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
-
-       if (tn) {
-               theChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
-
-               retVal =
-                   yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
-                                          chunkInInode);
-       }
-       return retVal;
-}
+       /* Check sane level and chunk Id */
+       if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL)
+               return NULL;
 
-static int yaffs_FindAndDeleteChunkInFile(yaffs_Object *in, int chunkInInode,
-                                         yaffs_ExtendedTags *tags)
-{
-       /* Get the Tnode, then get the level 0 offset chunk offset */
-       yaffs_Tnode *tn;
-       int theChunk = -1;
-       yaffs_ExtendedTags localTags;
+       if (chunk_id > YAFFS_MAX_CHUNK_ID)
+               return NULL;
 
-       yaffs_Device *dev = in->myDev;
-       int retVal = -1;
+       /* First check we're tall enough (ie enough top_level) */
 
-       if (!tags) {
-               /* Passed a NULL, so use our own tags space */
-               tags = &localTags;
+       i = chunk_id >> YAFFS_TNODES_LEVEL0_BITS;
+       required_depth = 0;
+       while (i) {
+               i >>= YAFFS_TNODES_INTERNAL_BITS;
+               required_depth++;
        }
 
-       tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
-
-       if (tn) {
-
-               theChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
+       if (required_depth > file_struct->top_level)
+               return NULL;    /* Not tall enough, so we can't find it */
 
-               retVal =
-                   yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
-                                          chunkInInode);
-
-               /* Delete the entry in the filestructure (if found) */
-               if (retVal != -1)
-                       yaffs_LoadLevel0Tnode(dev, tn, chunkInInode, 0);
+       /* Traverse down to level 0 */
+       while (level > 0 && tn) {
+               tn = tn->internal[(chunk_id >>
+                                  (YAFFS_TNODES_LEVEL0_BITS +
+                                   (level - 1) *
+                                   YAFFS_TNODES_INTERNAL_BITS)) &
+                                 YAFFS_TNODES_INTERNAL_MASK];
+               level--;
        }
 
-       return retVal;
+       return tn;
 }
 
-#ifdef YAFFS_PARANOID
+/* add_find_tnode_0 finds the level 0 tnode if it exists,
+ * otherwise first expands the tree.
+ * This happens in two steps:
+ *  1. If the tree isn't tall enough, then make it taller.
+ *  2. Scan down the tree towards the level 0 tnode adding tnodes if required.
+ *
+ * Used when modifying the tree.
+ *
+ *  If the tn argument is NULL, then a fresh tnode will be added otherwise the
+ *  specified tn will be plugged into the ttree.
+ */
 
-static int yaffs_CheckFileSanity(yaffs_Object *in)
+struct yaffs_tnode *yaffs_add_find_tnode_0(struct yaffs_dev *dev,
+                                          struct yaffs_file_var *file_struct,
+                                          u32 chunk_id,
+                                          struct yaffs_tnode *passed_tn)
 {
-       int chunk;
-       int nChunks;
-       int fSize;
-       int failed = 0;
-       int objId;
-       yaffs_Tnode *tn;
-       yaffs_Tags localTags;
-       yaffs_Tags *tags = &localTags;
-       int theChunk;
-       int chunkDeleted;
-
-       if (in->variantType != YAFFS_OBJECT_TYPE_FILE)
-               return YAFFS_FAIL;
-
-       objId = in->objectId;
-       fSize = in->variant.fileVariant.fileSize;
-       nChunks =
-           (fSize + in->myDev->nDataBytesPerChunk - 1) / in->myDev->nDataBytesPerChunk;
-
-       for (chunk = 1; chunk <= nChunks; chunk++) {
-               tn = yaffs_FindLevel0Tnode(in->myDev, &in->variant.fileVariant,
-                                          chunk);
-
-               if (tn) {
-
-                       theChunk = yaffs_GetChunkGroupBase(dev, tn, chunk);
-
-                       if (yaffs_CheckChunkBits
-                           (dev, theChunk / dev->param.nChunksPerBlock,
-                            theChunk % dev->param.nChunksPerBlock)) {
-
-                               yaffs_ReadChunkTagsFromNAND(in->myDev, theChunk,
-                                                           tags,
-                                                           &chunkDeleted);
-                               if (yaffs_TagsMatch
-                                   (tags, in->objectId, chunk, chunkDeleted)) {
-                                       /* found it; */
-
-                               }
-                       } else {
-
-                               failed = 1;
-                       }
-
-               } else {
-                       /* T(("No level 0 found for %d\n", chunk)); */
-               }
-       }
-
-       return failed ? YAFFS_FAIL : YAFFS_OK;
-}
-
-#endif
+       int required_depth;
+       int i;
+       int l;
+       struct yaffs_tnode *tn;
+       u32 x;
 
-static int yaffs_PutChunkIntoFile(yaffs_Object *in, int chunkInInode,
-                                 int chunkInNAND, int inScan)
-{
-       /* NB inScan is zero unless scanning.
-        * For forward scanning, inScan is > 0;
-        * for backward scanning inScan is < 0
-        *
-        * chunkInNAND = 0 is a dummy insert to make sure the tnodes are there.
-        */
+       /* Check sane level and page Id */
+       if (file_struct->top_level < 0 ||
+           file_struct->top_level > YAFFS_TNODES_MAX_LEVEL)
+               return NULL;
 
-       yaffs_Tnode *tn;
-       yaffs_Device *dev = in->myDev;
-       int existingChunk;
-       yaffs_ExtendedTags existingTags;
-       yaffs_ExtendedTags newTags;
-       unsigned existingSerial, newSerial;
+       if (chunk_id > YAFFS_MAX_CHUNK_ID)
+               return NULL;
 
-       if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
-               /* Just ignore an attempt at putting a chunk into a non-file during scanning
-                * If it is not during Scanning then something went wrong!
-                */
-               if (!inScan) {
-                       T(YAFFS_TRACE_ERROR,
-                         (TSTR
-                          ("yaffs tragedy:attempt to put data chunk into a non-file"
-                           TENDSTR)));
-                       YBUG();
-               }
+       /* First check we're tall enough (ie enough top_level) */
 
-               yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
-               return YAFFS_OK;
+       x = chunk_id >> YAFFS_TNODES_LEVEL0_BITS;
+       required_depth = 0;
+       while (x) {
+               x >>= YAFFS_TNODES_INTERNAL_BITS;
+               required_depth++;
        }
 
-       tn = yaffs_AddOrFindLevel0Tnode(dev,
-                                       &in->variant.fileVariant,
-                                       chunkInInode,
-                                       NULL);
-       if (!tn)
-               return YAFFS_FAIL;
-       
-       if(!chunkInNAND)
-               /* Dummy insert, bail now */
-               return YAFFS_OK;
-
-       existingChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
-
-       if (inScan != 0) {
-               /* If we're scanning then we need to test for duplicates
-                * NB This does not need to be efficient since it should only ever
-                * happen when the power fails during a write, then only one
-                * chunk should ever be affected.
-                *
-                * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO
-                * Update: For backward scanning we don't need to re-read tags so this is quite cheap.
-                */
-
-               if (existingChunk > 0) {
-                       /* NB Right now existing chunk will not be real chunkId if the device >= 32MB
-                        *    thus we have to do a FindChunkInFile to get the real chunk id.
-                        *
-                        * We have a duplicate now we need to decide which one to use:
-                        *
-                        * Backwards scanning YAFFS2: The old one is what we use, dump the new one.
-                        * Forward scanning YAFFS2: The new one is what we use, dump the old one.
-                        * YAFFS1: Get both sets of tags and compare serial numbers.
-                        */
-
-                       if (inScan > 0) {
-                               /* Only do this for forward scanning */
-                               yaffs_ReadChunkWithTagsFromNAND(dev,
-                                                               chunkInNAND,
-                                                               NULL, &newTags);
-
-                               /* Do a proper find */
-                               existingChunk =
-                                   yaffs_FindChunkInFile(in, chunkInInode,
-                                                         &existingTags);
-                       }
-
-                       if (existingChunk <= 0) {
-                               /*Hoosterman - how did this happen? */
-
-                               T(YAFFS_TRACE_ERROR,
-                                 (TSTR
-                                  ("yaffs tragedy: existing chunk < 0 in scan"
-                                   TENDSTR)));
-
-                       }
-
-                       /* NB The deleted flags should be false, otherwise the chunks will
-                        * not be loaded during a scan
-                        */
+       if (required_depth > file_struct->top_level) {
+               /* Not tall enough, gotta make the tree taller */
+               for (i = file_struct->top_level; i < required_depth; i++) {
 
-                       if (inScan > 0) {
-                               newSerial = newTags.serialNumber;
-                               existingSerial = existingTags.serialNumber;
-                       }
+                       tn = yaffs_get_tnode(dev);
 
-                       if ((inScan > 0) &&
-                           (in->myDev->param.isYaffs2 ||
-                            existingChunk <= 0 ||
-                            ((existingSerial + 1) & 3) == newSerial)) {
-                               /* Forward scanning.
-                                * Use new
-                                * Delete the old one and drop through to update the tnode
-                                */
-                               yaffs_DeleteChunk(dev, existingChunk, 1,
-                                                 __LINE__);
+                       if (tn) {
+                               tn->internal[0] = file_struct->top;
+                               file_struct->top = tn;
+                               file_struct->top_level++;
                        } else {
-                               /* Backward scanning or we want to use the existing one
-                                * Use existing.
-                                * Delete the new one and return early so that the tnode isn't changed
-                                */
-                               yaffs_DeleteChunk(dev, chunkInNAND, 1,
-                                                 __LINE__);
-                               return YAFFS_OK;
+                               yaffs_trace(YAFFS_TRACE_ERROR,
+                                       "yaffs: no more tnodes");
+                               return NULL;
                        }
                }
-
-       }
-
-       if (existingChunk == 0)
-               in->nDataChunks++;
-
-       yaffs_LoadLevel0Tnode(dev, tn, chunkInInode, chunkInNAND);
-
-       return YAFFS_OK;
-}
-
-static int yaffs_ReadChunkDataFromObject(yaffs_Object *in, int chunkInInode,
-                                       __u8 *buffer)
-{
-       int chunkInNAND = yaffs_FindChunkInFile(in, chunkInInode, NULL);
-
-       if (chunkInNAND >= 0)
-               return yaffs_ReadChunkWithTagsFromNAND(in->myDev, chunkInNAND,
-                                               buffer, NULL);
-       else {
-               T(YAFFS_TRACE_NANDACCESS,
-                 (TSTR("Chunk %d not found zero instead" TENDSTR),
-                  chunkInNAND));
-               /* get sane (zero) data if you read a hole */
-               memset(buffer, 0, in->myDev->nDataBytesPerChunk);
-               return 0;
-       }
-
-}
-
-void yaffs_DeleteChunk(yaffs_Device *dev, int chunkId, int markNAND, int lyn)
-{
-       int block;
-       int page;
-       yaffs_ExtendedTags tags;
-       yaffs_BlockInfo *bi;
-
-       if (chunkId <= 0)
-               return;
-
-       dev->nDeletions++;
-       block = chunkId / dev->param.nChunksPerBlock;
-       page = chunkId % dev->param.nChunksPerBlock;
-
-
-       if (!yaffs_CheckChunkBit(dev, block, page))
-               T(YAFFS_TRACE_VERIFY,
-                       (TSTR("Deleting invalid chunk %d"TENDSTR),
-                        chunkId));
-
-       bi = yaffs_GetBlockInfo(dev, block);
-       
-       yaffs_UpdateOldestDirtySequence(dev,bi);
-
-       T(YAFFS_TRACE_DELETION,
-         (TSTR("line %d delete of chunk %d" TENDSTR), lyn, chunkId));
-
-       if (markNAND &&
-           bi->blockState != YAFFS_BLOCK_STATE_COLLECTING && !dev->param.isYaffs2) {
-
-               yaffs_InitialiseTags(&tags);
-
-               tags.chunkDeleted = 1;
-
-               yaffs_WriteChunkWithTagsToNAND(dev, chunkId, NULL, &tags);
-               yaffs_HandleUpdateChunk(dev, chunkId, &tags);
-       } else {
-               dev->nUnmarkedDeletions++;
-       }
-
-       /* Pull out of the management area.
-        * If the whole block became dirty, this will kick off an erasure.
-        */
-       if (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING ||
-           bi->blockState == YAFFS_BLOCK_STATE_FULL ||
-           bi->blockState == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
-           bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) {
-               dev->nFreeChunks++;
-
-               yaffs_ClearChunkBit(dev, block, page);
-
-               bi->pagesInUse--;
-
-               if (bi->pagesInUse == 0 &&
-                   !bi->hasShrinkHeader &&
-                   bi->blockState != YAFFS_BLOCK_STATE_ALLOCATING &&
-                   bi->blockState != YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
-                       yaffs_BlockBecameDirty(dev, block);
-               }
-
-       }
-
-}
-
-static int yaffs_WriteChunkDataToObject(yaffs_Object *in, int chunkInInode,
-                                       const __u8 *buffer, int nBytes,
-                                       int useReserve)
-{
-       /* Find old chunk Need to do this to get serial number
-        * Write new one and patch into tree.
-        * Invalidate old tags.
-        */
-
-       int prevChunkId;
-       yaffs_ExtendedTags prevTags;
-
-       int newChunkId;
-       yaffs_ExtendedTags newTags;
-
-       yaffs_Device *dev = in->myDev;
-
-       yaffs_CheckGarbageCollection(dev);
-
-       /* Get the previous chunk at this location in the file if it exists.
-        * If it does not exist then put a zero into the tree. This creates
-        * the tnode now, rather than later when it is harder to clean up.
-        */
-       prevChunkId = yaffs_FindChunkInFile(in, chunkInInode, &prevTags);
-       if(prevChunkId < 1 &&
-               !yaffs_PutChunkIntoFile(in, chunkInInode, 0, 0))
-               return 0;
-
-       /* Set up new tags */
-       yaffs_InitialiseTags(&newTags);
-
-       newTags.chunkId = chunkInInode;
-       newTags.objectId = in->objectId;
-       newTags.serialNumber =
-           (prevChunkId > 0) ? prevTags.serialNumber + 1 : 1;
-       newTags.byteCount = nBytes;
-
-       if (nBytes < 1 || nBytes > dev->param.totalBytesPerChunk) {
-               T(YAFFS_TRACE_ERROR,
-               (TSTR("Writing %d bytes to chunk!!!!!!!!!" TENDSTR), nBytes));
-               YBUG();
-       }
-       
-               
-       newChunkId =
-           yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
-                                             useReserve);
-
-       if (newChunkId > 0) {
-               yaffs_PutChunkIntoFile(in, chunkInInode, newChunkId, 0);
-
-               if (prevChunkId > 0)
-                       yaffs_DeleteChunk(dev, prevChunkId, 1, __LINE__);
-
-               yaffs_CheckFileSanity(in);
        }
-       return newChunkId;
-
-}
-
-/* UpdateObjectHeader updates the header on NAND for an object.
- * If name is not NULL, then that new name is used.
- */
-int yaffs_UpdateObjectHeader(yaffs_Object *in, const YCHAR *name, int force,
-                            int isShrink, int shadows)
-{
-
-       yaffs_BlockInfo *bi;
-
-       yaffs_Device *dev = in->myDev;
-
-       int prevChunkId;
-       int retVal = 0;
-       int result = 0;
-
-       int newChunkId;
-       yaffs_ExtendedTags newTags;
-       yaffs_ExtendedTags oldTags;
-       YCHAR *alias = NULL;
-
-       __u8 *buffer = NULL;
-       YCHAR oldName[YAFFS_MAX_NAME_LENGTH + 1];
-
-       yaffs_ObjectHeader *oh = NULL;
-
-       yaffs_strcpy(oldName, _Y("silly old name"));
-
-
-       if (!in->fake ||
-               in == dev->rootDir || /* The rootDir should also be saved */
-               force) {
-
-               yaffs_CheckGarbageCollection(dev);
-               yaffs_CheckObjectDetailsLoaded(in);
-
-               buffer = yaffs_GetTempBuffer(in->myDev, __LINE__);
-               oh = (yaffs_ObjectHeader *) buffer;
-
-               prevChunkId = in->hdrChunk;
-
-               if (prevChunkId > 0) {
-                       result = yaffs_ReadChunkWithTagsFromNAND(dev, prevChunkId,
-                                                       buffer, &oldTags);
-
-                       yaffs_VerifyObjectHeader(in, oh, &oldTags, 0);
-
-                       memcpy(oldName, oh->name, sizeof(oh->name));
-               }
 
-               memset(buffer, 0xFF, dev->nDataBytesPerChunk);
-
-               oh->type = in->variantType;
-               oh->yst_mode = in->yst_mode;
-               oh->shadowsObject = oh->inbandShadowsObject = shadows;
-
-#ifdef CONFIG_YAFFS_WINCE
-               oh->win_atime[0] = in->win_atime[0];
-               oh->win_ctime[0] = in->win_ctime[0];
-               oh->win_mtime[0] = in->win_mtime[0];
-               oh->win_atime[1] = in->win_atime[1];
-               oh->win_ctime[1] = in->win_ctime[1];
-               oh->win_mtime[1] = in->win_mtime[1];
-#else
-               oh->yst_uid = in->yst_uid;
-               oh->yst_gid = in->yst_gid;
-               oh->yst_atime = in->yst_atime;
-               oh->yst_mtime = in->yst_mtime;
-               oh->yst_ctime = in->yst_ctime;
-               oh->yst_rdev = in->yst_rdev;
-#endif
-               if (in->parent)
-                       oh->parentObjectId = in->parent->objectId;
-               else
-                       oh->parentObjectId = 0;
-
-               if (name && *name) {
-                       memset(oh->name, 0, sizeof(oh->name));
-                       yaffs_strncpy(oh->name, name, YAFFS_MAX_NAME_LENGTH);
-               } else if (prevChunkId > 0)
-                       memcpy(oh->name, oldName, sizeof(oh->name));
-               else
-                       memset(oh->name, 0, sizeof(oh->name));
-
-               oh->isShrink = isShrink;
+       /* Traverse down to level 0, adding anything we need */
 
-               switch (in->variantType) {
-               case YAFFS_OBJECT_TYPE_UNKNOWN:
-                       /* Should not happen */
-                       break;
-               case YAFFS_OBJECT_TYPE_FILE:
-                       oh->fileSize =
-                           (oh->parentObjectId == YAFFS_OBJECTID_DELETED
-                            || oh->parentObjectId ==
-                            YAFFS_OBJECTID_UNLINKED) ? 0 : in->variant.
-                           fileVariant.fileSize;
-                       break;
-               case YAFFS_OBJECT_TYPE_HARDLINK:
-                       oh->equivalentObjectId =
-                           in->variant.hardLinkVariant.equivalentObjectId;
-                       break;
-               case YAFFS_OBJECT_TYPE_SPECIAL:
-                       /* Do nothing */
-                       break;
-               case YAFFS_OBJECT_TYPE_DIRECTORY:
-                       /* Do nothing */
-                       break;
-               case YAFFS_OBJECT_TYPE_SYMLINK:
-                       alias = in->variant.symLinkVariant.alias;
-                       if(!alias)
-                               alias = _Y("no alias");
-                       yaffs_strncpy(oh->alias,
-                                       alias,
-                                     YAFFS_MAX_ALIAS_LENGTH);
-                       oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
-                       break;
-               }
+       l = file_struct->top_level;
+       tn = file_struct->top;
 
-               /* Tags */
-               yaffs_InitialiseTags(&newTags);
-               in->serial++;
-               newTags.chunkId = 0;
-               newTags.objectId = in->objectId;
-               newTags.serialNumber = in->serial;
+       if (l > 0) {
+               while (l > 0 && tn) {
+                       x = (chunk_id >>
+                            (YAFFS_TNODES_LEVEL0_BITS +
+                             (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
+                           YAFFS_TNODES_INTERNAL_MASK;
 
-               /* Add extra info for file header */
+                       if ((l > 1) && !tn->internal[x]) {
+                               /* Add missing non-level-zero tnode */
+                               tn->internal[x] = yaffs_get_tnode(dev);
+                               if (!tn->internal[x])
+                                       return NULL;
+                       } else if (l == 1) {
+                               /* Looking from level 1 at level 0 */
+                               if (passed_tn) {
+                                       /* If we already have one, release it */
+                                       if (tn->internal[x])
+                                               yaffs_free_tnode(dev,
+                                                       tn->internal[x]);
+                                       tn->internal[x] = passed_tn;
 
-               newTags.extraHeaderInfoAvailable = 1;
-               newTags.extraParentObjectId = oh->parentObjectId;
-               newTags.extraFileLength = oh->fileSize;
-               newTags.extraIsShrinkHeader = oh->isShrink;
-               newTags.extraEquivalentObjectId = oh->equivalentObjectId;
-               newTags.extraShadows = (oh->shadowsObject > 0) ? 1 : 0;
-               newTags.extraObjectType = in->variantType;
+                               } else if (!tn->internal[x]) {
+                                       /* Don't have one, none passed in */
+                                       tn->internal[x] = yaffs_get_tnode(dev);
+                                       if (!tn->internal[x])
+                                               return NULL;
+                               }
+                       }
 
-               yaffs_VerifyObjectHeader(in, oh, &newTags, 1);
+                       tn = tn->internal[x];
+                       l--;
+               }
+       } else {
+               /* top is level 0 */
+               if (passed_tn) {
+                       memcpy(tn, passed_tn,
+                              (dev->tnode_width * YAFFS_NTNODES_LEVEL0) / 8);
+                       yaffs_free_tnode(dev, passed_tn);
+               }
+       }
 
-               /* Create new chunk in NAND */
-               newChunkId =
-                   yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
-                                                     (prevChunkId > 0) ? 1 : 0);
+       return tn;
+}
 
-               if (newChunkId >= 0) {
+static int yaffs_tags_match(const struct yaffs_ext_tags *tags, int obj_id,
+                           int chunk_obj)
+{
+       return (tags->chunk_id == chunk_obj &&
+               tags->obj_id == obj_id &&
+               !tags->is_deleted) ? 1 : 0;
 
-                       in->hdrChunk = newChunkId;
+}
 
-                       if (prevChunkId > 0) {
-                               yaffs_DeleteChunk(dev, prevChunkId, 1,
-                                                 __LINE__);
-                       }
+static int yaffs_find_chunk_in_group(struct yaffs_dev *dev, int the_chunk,
+                                       struct yaffs_ext_tags *tags, int obj_id,
+                                       int inode_chunk)
+{
+       int j;
 
-                       if (!yaffs_ObjectHasCachedWriteData(in))
-                               in->dirty = 0;
+       for (j = 0; the_chunk && j < dev->chunk_grp_size; j++) {
+               if (yaffs_check_chunk_bit
+                   (dev, the_chunk / dev->param.chunks_per_block,
+                    the_chunk % dev->param.chunks_per_block)) {
 
-                       /* If this was a shrink, then mark the block that the chunk lives on */
-                       if (isShrink) {
-                               bi = yaffs_GetBlockInfo(in->myDev,
-                                       newChunkId / in->myDev->param.nChunksPerBlock);
-                               bi->hasShrinkHeader = 1;
+                       if (dev->chunk_grp_size == 1)
+                               return the_chunk;
+                       else {
+                               yaffs_rd_chunk_tags_nand(dev, the_chunk, NULL,
+                                                        tags);
+                               if (yaffs_tags_match(tags,
+                                                       obj_id, inode_chunk)) {
+                                       /* found it; */
+                                       return the_chunk;
+                               }
                        }
-
                }
-
-               retVal = newChunkId;
-
+               the_chunk++;
        }
-
-       if (buffer)
-               yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
-
-       return retVal;
+       return -1;
 }
 
-/*------------------------ Short Operations Cache ----------------------------------------
- *   In many situations where there is no high level buffering (eg WinCE) a lot of
- *   reads might be short sequential reads, and a lot of writes may be short
- *   sequential writes. eg. scanning/writing a jpeg file.
- *   In these cases, a short read/write cache can provide a huge perfomance benefit
- *   with dumb-as-a-rock code.
- *   In Linux, the page cache provides read buffering aand the short op cache provides write
- *   buffering.
- *
- *   There are a limited number (~10) of cache chunks per device so that we don't
- *   need a very intelligent search.
- */
-
-static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj)
+static int yaffs_find_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
+                                   struct yaffs_ext_tags *tags)
 {
-       yaffs_Device *dev = obj->myDev;
-       int i;
-       yaffs_ChunkCache *cache;
-       int nCaches = obj->myDev->param.nShortOpCaches;
+       /*Get the Tnode, then get the level 0 offset chunk offset */
+       struct yaffs_tnode *tn;
+       int the_chunk = -1;
+       struct yaffs_ext_tags local_tags;
+       int ret_val = -1;
+       struct yaffs_dev *dev = in->my_dev;
 
-       for (i = 0; i < nCaches; i++) {
-               cache = &dev->srCache[i];
-               if (cache->object == obj &&
-                   cache->dirty)
-                       return 1;
+       if (!tags) {
+               /* Passed a NULL, so use our own tags space */
+               tags = &local_tags;
        }
 
-       return 0;
-}
-
+       tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk);
 
-static void yaffs_FlushFilesChunkCache(yaffs_Object *obj)
-{
-       yaffs_Device *dev = obj->myDev;
-       int lowest = -99;       /* Stop compiler whining. */
-       int i;
-       yaffs_ChunkCache *cache;
-       int chunkWritten = 0;
-       int nCaches = obj->myDev->param.nShortOpCaches;
-
-       if (nCaches > 0) {
-               do {
-                       cache = NULL;
-
-                       /* Find the dirty cache for this object with the lowest chunk id. */
-                       for (i = 0; i < nCaches; i++) {
-                               if (dev->srCache[i].object == obj &&
-                                   dev->srCache[i].dirty) {
-                                       if (!cache
-                                           || dev->srCache[i].chunkId <
-                                           lowest) {
-                                               cache = &dev->srCache[i];
-                                               lowest = cache->chunkId;
-                                       }
-                               }
-                       }
+       if (!tn)
+               return ret_val;
 
-                       if (cache && !cache->locked) {
-                               /* Write it out and free it up */
-
-                               chunkWritten =
-                                   yaffs_WriteChunkDataToObject(cache->object,
-                                                                cache->chunkId,
-                                                                cache->data,
-                                                                cache->nBytes,
-                                                                1);
-                               cache->dirty = 0;
-                               cache->object = NULL;
-                       }
+       the_chunk = yaffs_get_group_base(dev, tn, inode_chunk);
 
-               } while (cache && chunkWritten > 0);
+       ret_val = yaffs_find_chunk_in_group(dev, the_chunk, tags, in->obj_id,
+                                             inode_chunk);
+       return ret_val;
+}
 
-               if (cache) {
-                       /* Hoosterman, disk full while writing cache out. */
-                       T(YAFFS_TRACE_ERROR,
-                         (TSTR("yaffs tragedy: no space during cache write" TENDSTR)));
+static int yaffs_find_del_file_chunk(struct yaffs_obj *in, int inode_chunk,
+                                    struct yaffs_ext_tags *tags)
+{
+       /* Get the Tnode, then get the level 0 offset chunk offset */
+       struct yaffs_tnode *tn;
+       int the_chunk = -1;
+       struct yaffs_ext_tags local_tags;
+       struct yaffs_dev *dev = in->my_dev;
+       int ret_val = -1;
 
-               }
+       if (!tags) {
+               /* Passed a NULL, so use our own tags space */
+               tags = &local_tags;
        }
 
-}
-
-/*yaffs_FlushEntireDeviceCache(dev)
- *
- *
- */
+       tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk);
 
-void yaffs_FlushEntireDeviceCache(yaffs_Device *dev)
-{
-       yaffs_Object *obj;
-       int nCaches = dev->param.nShortOpCaches;
-       int i;
+       if (!tn)
+               return ret_val;
 
-       /* Find a dirty object in the cache and flush it...
-        * until there are no further dirty objects.
-        */
-       do {
-               obj = NULL;
-               for (i = 0; i < nCaches && !obj; i++) {
-                       if (dev->srCache[i].object &&
-                           dev->srCache[i].dirty)
-                               obj = dev->srCache[i].object;
+       the_chunk = yaffs_get_group_base(dev, tn, inode_chunk);
 
-               }
-               if (obj)
-                       yaffs_FlushFilesChunkCache(obj);
+       ret_val = yaffs_find_chunk_in_group(dev, the_chunk, tags, in->obj_id,
+                                             inode_chunk);
 
-       } while (obj);
+       /* Delete the entry in the filestructure (if found) */
+       if (ret_val != -1)
+               yaffs_load_tnode_0(dev, tn, inode_chunk, 0);
 
+       return ret_val;
 }
 
-
-/* Grab us a cache chunk for use.
- * First look for an empty one.
- * Then look for the least recently used non-dirty one.
- * Then look for the least recently used dirty one...., flush and look again.
- */
-static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device *dev)
+int yaffs_put_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
+                           int nand_chunk, int in_scan)
 {
-       int i;
+       /* NB in_scan is zero unless scanning.
+        * For forward scanning, in_scan is > 0;
+        * for backward scanning in_scan is < 0
+        *
+        * nand_chunk = 0 is a dummy insert to make sure the tnodes are there.
+        */
+
+       struct yaffs_tnode *tn;
+       struct yaffs_dev *dev = in->my_dev;
+       int existing_cunk;
+       struct yaffs_ext_tags existing_tags;
+       struct yaffs_ext_tags new_tags;
+       unsigned existing_serial, new_serial;
 
-       if (dev->param.nShortOpCaches > 0) {
-               for (i = 0; i < dev->param.nShortOpCaches; i++) {
-                       if (!dev->srCache[i].object)
-                               return &dev->srCache[i];
+       if (in->variant_type != YAFFS_OBJECT_TYPE_FILE) {
+               /* Just ignore an attempt at putting a chunk into a non-file
+                * during scanning.
+                * If it is not during Scanning then something went wrong!
+                */
+               if (!in_scan) {
+                       yaffs_trace(YAFFS_TRACE_ERROR,
+                               "yaffs tragedy:attempt to put data chunk into a non-file"
+                               );
+                       BUG();
                }
+
+               yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
+               return YAFFS_OK;
        }
 
-       return NULL;
-}
+       tn = yaffs_add_find_tnode_0(dev,
+                                   &in->variant.file_variant,
+                                   inode_chunk, NULL);
+       if (!tn)
+               return YAFFS_FAIL;
 
-static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device *dev)
-{
-       yaffs_ChunkCache *cache;
-       yaffs_Object *theObj;
-       int usage;
-       int i;
-       int pushout;
+       if (!nand_chunk)
+               /* Dummy insert, bail now */
+               return YAFFS_OK;
 
-       if (dev->param.nShortOpCaches > 0) {
-               /* Try find a non-dirty one... */
+       existing_cunk = yaffs_get_group_base(dev, tn, inode_chunk);
 
-               cache = yaffs_GrabChunkCacheWorker(dev);
+       if (in_scan != 0) {
+               /* If we're scanning then we need to test for duplicates
+                * NB This does not need to be efficient since it should only
+                * happen when the power fails during a write, then only one
+                * chunk should ever be affected.
+                *
+                * Correction for YAFFS2: This could happen quite a lot and we
+                * need to think about efficiency! TODO
+                * Update: For backward scanning we don't need to re-read tags
+                * so this is quite cheap.
+                */
 
-               if (!cache) {
-                       /* They were all dirty, find the last recently used object and flush
-                        * its cache, then  find again.
-                        * NB what's here is not very accurate, we actually flush the object
-                        * the last recently used page.
+               if (existing_cunk > 0) {
+                       /* NB Right now existing chunk will not be real
+                        * chunk_id if the chunk group size > 1
+                        * thus we have to do a FindChunkInFile to get the
+                        * real chunk id.
+                        *
+                        * We have a duplicate now we need to decide which
+                        * one to use:
+                        *
+                        * Backwards scanning YAFFS2: The old one is what
+                        * we use, dump the new one.
+                        * YAFFS1: Get both sets of tags and compare serial
+                        * numbers.
                         */
 
-                       /* With locking we can't assume we can use entry zero */
-
-                       theObj = NULL;
-                       usage = -1;
-                       cache = NULL;
-                       pushout = -1;
-
-                       for (i = 0; i < dev->param.nShortOpCaches; i++) {
-                               if (dev->srCache[i].object &&
-                                   !dev->srCache[i].locked &&
-                                   (dev->srCache[i].lastUse < usage || !cache)) {
-                                       usage = dev->srCache[i].lastUse;
-                                       theObj = dev->srCache[i].object;
-                                       cache = &dev->srCache[i];
-                                       pushout = i;
-                               }
-                       }
+                       if (in_scan > 0) {
+                               /* Only do this for forward scanning */
+                               yaffs_rd_chunk_tags_nand(dev,
+                                                        nand_chunk,
+                                                        NULL, &new_tags);
 
-                       if (!cache || cache->dirty) {
-                               /* Flush and try again */
-                               yaffs_FlushFilesChunkCache(theObj);
-                               cache = yaffs_GrabChunkCacheWorker(dev);
+                               /* Do a proper find */
+                               existing_cunk =
+                                   yaffs_find_chunk_in_file(in, inode_chunk,
+                                                            &existing_tags);
                        }
 
-               }
-               return cache;
-       } else
-               return NULL;
-
-}
+                       if (existing_cunk <= 0) {
+                               /*Hoosterman - how did this happen? */
 
-/* Find a cached chunk */
-static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object *obj,
-                                             int chunkId)
-{
-       yaffs_Device *dev = obj->myDev;
-       int i;
-       if (dev->param.nShortOpCaches > 0) {
-               for (i = 0; i < dev->param.nShortOpCaches; i++) {
-                       if (dev->srCache[i].object == obj &&
-                           dev->srCache[i].chunkId == chunkId) {
-                               dev->cacheHits++;
+                               yaffs_trace(YAFFS_TRACE_ERROR,
+                                       "yaffs tragedy: existing chunk < 0 in scan"
+                                       );
 
-                               return &dev->srCache[i];
                        }
-               }
-       }
-       return NULL;
-}
 
-/* Mark the chunk for the least recently used algorithym */
-static void yaffs_UseChunkCache(yaffs_Device *dev, yaffs_ChunkCache *cache,
-                               int isAWrite)
-{
+                       /* NB The deleted flags should be false, otherwise
+                        * the chunks will not be loaded during a scan
+                        */
 
-       if (dev->param.nShortOpCaches > 0) {
-               if (dev->srLastUse < 0 || dev->srLastUse > 100000000) {
-                       /* Reset the cache usages */
-                       int i;
-                       for (i = 1; i < dev->param.nShortOpCaches; i++)
-                               dev->srCache[i].lastUse = 0;
+                       if (in_scan > 0) {
+                               new_serial = new_tags.serial_number;
+                               existing_serial = existing_tags.serial_number;
+                       }
 
-                       dev->srLastUse = 0;
+                       if ((in_scan > 0) &&
+                           (existing_cunk <= 0 ||
+                            ((existing_serial + 1) & 3) == new_serial)) {
+                               /* Forward scanning.
+                                * Use new
+                                * Delete the old one and drop through to
+                                * update the tnode
+                                */
+                               yaffs_chunk_del(dev, existing_cunk, 1,
+                                               __LINE__);
+                       } else {
+                               /* Backward scanning or we want to use the
+                                * existing one
+                                * Delete the new one and return early so that
+                                * the tnode isn't changed
+                                */
+                               yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
+                               return YAFFS_OK;
+                       }
                }
 
-               dev->srLastUse++;
+       }
 
-               cache->lastUse = dev->srLastUse;
+       if (existing_cunk == 0)
+               in->n_data_chunks++;
 
-               if (isAWrite)
-                       cache->dirty = 1;
-       }
+       yaffs_load_tnode_0(dev, tn, inode_chunk, nand_chunk);
+
+       return YAFFS_OK;
 }
 
-/* Invalidate a single cache page.
- * Do this when a whole page gets written,
- * ie the short cache for this page is no longer valid.
- */
-static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId)
+static void yaffs_soft_del_chunk(struct yaffs_dev *dev, int chunk)
 {
-       if (object->myDev->param.nShortOpCaches > 0) {
-               yaffs_ChunkCache *cache = yaffs_FindChunkCache(object, chunkId);
+       struct yaffs_block_info *the_block;
+       unsigned block_no;
 
-               if (cache)
-                       cache->object = NULL;
+       yaffs_trace(YAFFS_TRACE_DELETION, "soft delete chunk %d", chunk);
+
+       block_no = chunk / dev->param.chunks_per_block;
+       the_block = yaffs_get_block_info(dev, block_no);
+       if (the_block) {
+               the_block->soft_del_pages++;
+               dev->n_free_chunks++;
+               yaffs2_update_oldest_dirty_seq(dev, block_no, the_block);
        }
 }
 
-/* Invalidate all the cache pages associated with this object
- * Do this whenever ther file is deleted or resized.
+/* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all
+ * the chunks in the file.
+ * All soft deleting does is increment the block's softdelete count and pulls
+ * the chunk out of the tnode.
+ * Thus, essentially this is the same as DeleteWorker except that the chunks
+ * are soft deleted.
  */
-static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in)
+
+static int yaffs_soft_del_worker(struct yaffs_obj *in, struct yaffs_tnode *tn,
+                                u32 level, int chunk_offset)
 {
        int i;
-       yaffs_Device *dev = in->myDev;
+       int the_chunk;
+       int all_done = 1;
+       struct yaffs_dev *dev = in->my_dev;
 
-       if (dev->param.nShortOpCaches > 0) {
-               /* Invalidate it. */
-               for (i = 0; i < dev->param.nShortOpCaches; i++) {
-                       if (dev->srCache[i].object == in)
-                               dev->srCache[i].object = NULL;
+       if (!tn)
+               return 1;
+
+       if (level > 0) {
+               for (i = YAFFS_NTNODES_INTERNAL - 1;
+                       all_done && i >= 0;
+                       i--) {
+                       if (tn->internal[i]) {
+                               all_done =
+                                   yaffs_soft_del_worker(in,
+                                       tn->internal[i],
+                                       level - 1,
+                                       (chunk_offset <<
+                                       YAFFS_TNODES_INTERNAL_BITS)
+                                       + i);
+                               if (all_done) {
+                                       yaffs_free_tnode(dev,
+                                               tn->internal[i]);
+                                       tn->internal[i] = NULL;
+                               } else {
+                                       /* Can this happen? */
+                               }
+                       }
                }
+               return (all_done) ? 1 : 0;
        }
-}
-
-/*--------------------- Checkpointing --------------------*/
-
-
-static int yaffs_WriteCheckpointValidityMarker(yaffs_Device *dev, int head)
-{
-       yaffs_CheckpointValidity cp;
-
-       memset(&cp, 0, sizeof(cp));
-
-       cp.structType = sizeof(cp);
-       cp.magic = YAFFS_MAGIC;
-       cp.version = YAFFS_CHECKPOINT_VERSION;
-       cp.head = (head) ? 1 : 0;
 
-       return (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp)) ?
-               1 : 0;
+       /* level 0 */
+        for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
+               the_chunk = yaffs_get_group_base(dev, tn, i);
+               if (the_chunk) {
+                       yaffs_soft_del_chunk(dev, the_chunk);
+                       yaffs_load_tnode_0(dev, tn, i, 0);
+               }
+       }
+       return 1;
 }
 
-static int yaffs_ReadCheckpointValidityMarker(yaffs_Device *dev, int head)
+static void yaffs_remove_obj_from_dir(struct yaffs_obj *obj)
 {
-       yaffs_CheckpointValidity cp;
-       int ok;
-
-       ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
+       struct yaffs_dev *dev = obj->my_dev;
+       struct yaffs_obj *parent;
 
-       if (ok)
-               ok = (cp.structType == sizeof(cp)) &&
-                    (cp.magic == YAFFS_MAGIC) &&
-                    (cp.version == YAFFS_CHECKPOINT_VERSION) &&
-                    (cp.head == ((head) ? 1 : 0));
-       return ok ? 1 : 0;
-}
-
-static void yaffs_DeviceToCheckpointDevice(yaffs_CheckpointDevice *cp,
-                                          yaffs_Device *dev)
-{
-       cp->nErasedBlocks = dev->nErasedBlocks;
-       cp->allocationBlock = dev->allocationBlock;
-       cp->allocationPage = dev->allocationPage;
-       cp->nFreeChunks = dev->nFreeChunks;
+       yaffs_verify_obj_in_dir(obj);
+       parent = obj->parent;
 
-       cp->nDeletedFiles = dev->nDeletedFiles;
-       cp->nUnlinkedFiles = dev->nUnlinkedFiles;
-       cp->nBackgroundDeletions = dev->nBackgroundDeletions;
-       cp->sequenceNumber = dev->sequenceNumber;
+       yaffs_verify_dir(parent);
 
-}
+       if (dev && dev->param.remove_obj_fn)
+               dev->param.remove_obj_fn(obj);
 
-static void yaffs_CheckpointDeviceToDevice(yaffs_Device *dev,
-                                          yaffs_CheckpointDevice *cp)
-{
-       dev->nErasedBlocks = cp->nErasedBlocks;
-       dev->allocationBlock = cp->allocationBlock;
-       dev->allocationPage = cp->allocationPage;
-       dev->nFreeChunks = cp->nFreeChunks;
+       list_del_init(&obj->siblings);
+       obj->parent = NULL;
 
-       dev->nDeletedFiles = cp->nDeletedFiles;
-       dev->nUnlinkedFiles = cp->nUnlinkedFiles;
-       dev->nBackgroundDeletions = cp->nBackgroundDeletions;
-       dev->sequenceNumber = cp->sequenceNumber;
+       yaffs_verify_dir(parent);
 }
 
-
-static int yaffs_WriteCheckpointDevice(yaffs_Device *dev)
+void yaffs_add_obj_to_dir(struct yaffs_obj *directory, struct yaffs_obj *obj)
 {
-       yaffs_CheckpointDevice cp;
-       __u32 nBytes;
-       __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
+       if (!directory) {
+               yaffs_trace(YAFFS_TRACE_ALWAYS,
+                       "tragedy: Trying to add an object to a null pointer directory"
+                       );
+               BUG();
+               return;
+       }
+       if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
+               yaffs_trace(YAFFS_TRACE_ALWAYS,
+                       "tragedy: Trying to add an object to a non-directory"
+                       );
+               BUG();
+       }
 
-       int ok;
+       if (obj->siblings.prev == NULL) {
+               /* Not initialised */
+               BUG();
+       }
 
-       /* Write device runtime values*/
-       yaffs_DeviceToCheckpointDevice(&cp, dev);
-       cp.structType = sizeof(cp);
+       yaffs_verify_dir(directory);
 
-       ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
+       yaffs_remove_obj_from_dir(obj);
 
-       /* Write block info */
-       if (ok) {
-               nBytes = nBlocks * sizeof(yaffs_BlockInfo);
-               ok = (yaffs_CheckpointWrite(dev, dev->blockInfo, nBytes) == nBytes);
-       }
+       /* Now add it */
+       list_add(&obj->siblings, &directory->variant.dir_variant.children);
+       obj->parent = directory;
 
-       /* Write chunk bits */
-       if (ok) {
-               nBytes = nBlocks * dev->chunkBitmapStride;
-               ok = (yaffs_CheckpointWrite(dev, dev->chunkBits, nBytes) == nBytes);
+       if (directory == obj->my_dev->unlinked_dir
+           || directory == obj->my_dev->del_dir) {
+               obj->unlinked = 1;
+               obj->my_dev->n_unlinked_files++;
+               obj->rename_allowed = 0;
        }
-       return   ok ? 1 : 0;
 
+       yaffs_verify_dir(directory);
+       yaffs_verify_obj_in_dir(obj);
 }
 
-static int yaffs_ReadCheckpointDevice(yaffs_Device *dev)
+static int yaffs_change_obj_name(struct yaffs_obj *obj,
+                                struct yaffs_obj *new_dir,
+                                const YCHAR *new_name, int force, int shadows)
 {
-       yaffs_CheckpointDevice cp;
-       __u32 nBytes;
-       __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
-
-       int ok;
+       int unlink_op;
+       int del_op;
+       struct yaffs_obj *existing_target;
 
-       ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
-       if (!ok)
-               return 0;
+       if (new_dir == NULL)
+               new_dir = obj->parent;  /* use the old directory */
 
-       if (cp.structType != sizeof(cp))
-               return 0;
+       if (new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
+               yaffs_trace(YAFFS_TRACE_ALWAYS,
+                       "tragedy: yaffs_change_obj_name: new_dir is not a directory"
+                       );
+               BUG();
+       }
 
+       unlink_op = (new_dir == obj->my_dev->unlinked_dir);
+       del_op = (new_dir == obj->my_dev->del_dir);
 
-       yaffs_CheckpointDeviceToDevice(dev, &cp);
+       existing_target = yaffs_find_by_name(new_dir, new_name);
 
-       nBytes = nBlocks * sizeof(yaffs_BlockInfo);
+       /* If the object is a file going into the unlinked directory,
+        *   then it is OK to just stuff it in since duplicate names are OK.
+        *   else only proceed if the new name does not exist and we're putting
+        *   it into a directory.
+        */
+       if (!(unlink_op || del_op || force ||
+             shadows > 0 || !existing_target) ||
+             new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
+               return YAFFS_FAIL;
 
-       ok = (yaffs_CheckpointRead(dev, dev->blockInfo, nBytes) == nBytes);
+       yaffs_set_obj_name(obj, new_name);
+       obj->dirty = 1;
+       yaffs_add_obj_to_dir(new_dir, obj);
 
-       if (!ok)
-               return 0;
-       nBytes = nBlocks * dev->chunkBitmapStride;
+       if (unlink_op)
+               obj->unlinked = 1;
 
-       ok = (yaffs_CheckpointRead(dev, dev->chunkBits, nBytes) == nBytes);
+       /* If it is a deletion then we mark it as a shrink for gc  */
+       if (yaffs_update_oh(obj, new_name, 0, del_op, shadows, NULL) >= 0)
+               return YAFFS_OK;
 
-       return ok ? 1 : 0;
+       return YAFFS_FAIL;
 }
 
-static void yaffs_ObjectToCheckpointObject(yaffs_CheckpointObject *cp,
-                                          yaffs_Object *obj)
-{
-
-       cp->objectId = obj->objectId;
-       cp->parentId = (obj->parent) ? obj->parent->objectId : 0;
-       cp->hdrChunk = obj->hdrChunk;
-       cp->variantType = obj->variantType;
-       cp->deleted = obj->deleted;
-       cp->softDeleted = obj->softDeleted;
-       cp->unlinked = obj->unlinked;
-       cp->fake = obj->fake;
-       cp->renameAllowed = obj->renameAllowed;
-       cp->unlinkAllowed = obj->unlinkAllowed;
-       cp->serial = obj->serial;
-       cp->nDataChunks = obj->nDataChunks;
-
-       if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
-               cp->fileSizeOrEquivalentObjectId = obj->variant.fileVariant.fileSize;
-       else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
-               cp->fileSizeOrEquivalentObjectId = obj->variant.hardLinkVariant.equivalentObjectId;
-}
+/*------------------------ Short Operations Cache ------------------------------
+ *   In many situations where there is no high level buffering  a lot of
+ *   reads might be short sequential reads, and a lot of writes may be short
+ *   sequential writes. eg. scanning/writing a jpeg file.
+ *   In these cases, a short read/write cache can provide a huge perfomance
+ *   benefit with dumb-as-a-rock code.
+ *   In Linux, the page cache provides read buffering and the short op cache
+ *   provides write buffering.
+ *
+ *   There are a small number (~10) of cache chunks per device so that we don't
+ *   need a very intelligent search.
+ */
 
-static int yaffs_CheckpointObjectToObject(yaffs_Object *obj, yaffs_CheckpointObject *cp)
+static int yaffs_obj_cache_dirty(struct yaffs_obj *obj)
 {
+       struct yaffs_dev *dev = obj->my_dev;
+       int i;
+       struct yaffs_cache *cache;
+       int n_caches = obj->my_dev->param.n_caches;
 
-       yaffs_Object *parent;
-
-       if (obj->variantType != cp->variantType) {
-               T(YAFFS_TRACE_ERROR, (TSTR("Checkpoint read object %d type %d "
-                       TCONT("chunk %d does not match existing object type %d")
-                       TENDSTR), cp->objectId, cp->variantType, cp->hdrChunk,
-                       obj->variantType));
-               return 0;
+       for (i = 0; i < n_caches; i++) {
+               cache = &dev->cache[i];
+               if (cache->object == obj && cache->dirty)
+                       return 1;
        }
 
-       obj->objectId = cp->objectId;
-
-       if (cp->parentId)
-               parent = yaffs_FindOrCreateObjectByNumber(
-                                       obj->myDev,
-                                       cp->parentId,
-                                       YAFFS_OBJECT_TYPE_DIRECTORY);
-       else
-               parent = NULL;
-
-       if (parent) {
-               if (parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
-                       T(YAFFS_TRACE_ALWAYS, (TSTR("Checkpoint read object %d parent %d type %d"
-                               TCONT(" chunk %d Parent type, %d, not directory")
-                               TENDSTR),
-                               cp->objectId, cp->parentId, cp->variantType,
-                               cp->hdrChunk, parent->variantType));
-                       return 0;
-               }
-               yaffs_AddObjectToDirectory(parent, obj);
-       }
-
-       obj->hdrChunk = cp->hdrChunk;
-       obj->variantType = cp->variantType;
-       obj->deleted = cp->deleted;
-       obj->softDeleted = cp->softDeleted;
-       obj->unlinked = cp->unlinked;
-       obj->fake = cp->fake;
-       obj->renameAllowed = cp->renameAllowed;
-       obj->unlinkAllowed = cp->unlinkAllowed;
-       obj->serial = cp->serial;
-       obj->nDataChunks = cp->nDataChunks;
-
-       if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
-               obj->variant.fileVariant.fileSize = cp->fileSizeOrEquivalentObjectId;
-       else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
-               obj->variant.hardLinkVariant.equivalentObjectId = cp->fileSizeOrEquivalentObjectId;
-
-       if (obj->hdrChunk > 0)
-               obj->lazyLoaded = 1;
-       return 1;
+       return 0;
 }
 
-
-
-static int yaffs_CheckpointTnodeWorker(yaffs_Object *in, yaffs_Tnode *tn,
-                                       __u32 level, int chunkOffset)
+static void yaffs_flush_file_cache(struct yaffs_obj *obj)
 {
+       struct yaffs_dev *dev = obj->my_dev;
+       int lowest = -99;       /* Stop compiler whining. */
        int i;
-       yaffs_Device *dev = in->myDev;
-       int ok = 1;
-       int tnodeSize = yaffs_CalcTnodeSize(dev);
+       struct yaffs_cache *cache;
+       int chunk_written = 0;
+       int n_caches = obj->my_dev->param.n_caches;
 
-       if (tn) {
-               if (level > 0) {
-
-                       for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++) {
-                               if (tn->internal[i]) {
-                                       ok = yaffs_CheckpointTnodeWorker(in,
-                                                       tn->internal[i],
-                                                       level - 1,
-                                                       (chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
+       if (n_caches < 1)
+               return;
+       do {
+               cache = NULL;
+
+               /* Find the lowest dirty chunk for this object */
+               for (i = 0; i < n_caches; i++) {
+                       if (dev->cache[i].object == obj &&
+                           dev->cache[i].dirty) {
+                               if (!cache ||
+                                   dev->cache[i].chunk_id < lowest) {
+                                       cache = &dev->cache[i];
+                                       lowest = cache->chunk_id;
                                }
                        }
-               } else if (level == 0) {
-                       __u32 baseOffset = chunkOffset <<  YAFFS_TNODES_LEVEL0_BITS;
-                       ok = (yaffs_CheckpointWrite(dev, &baseOffset, sizeof(baseOffset)) == sizeof(baseOffset));
-                       if (ok)
-                               ok = (yaffs_CheckpointWrite(dev, tn, tnodeSize) == tnodeSize);
                }
-       }
 
-       return ok;
+               if (cache && !cache->locked) {
+                       /* Write it out and free it up */
+                       chunk_written =
+                           yaffs_wr_data_obj(cache->object,
+                                             cache->chunk_id,
+                                             cache->data,
+                                             cache->n_bytes, 1);
+                       cache->dirty = 0;
+                       cache->object = NULL;
+               }
+       } while (cache && chunk_written > 0);
 
+       if (cache)
+               /* Hoosterman, disk full while writing cache out. */
+               yaffs_trace(YAFFS_TRACE_ERROR,
+                       "yaffs tragedy: no space during cache write");
 }
 
-static int yaffs_WriteCheckpointTnodes(yaffs_Object *obj)
+/*yaffs_flush_whole_cache(dev)
+ *
+ *
+ */
+
+void yaffs_flush_whole_cache(struct yaffs_dev *dev)
 {
-       __u32 endMarker = ~0;
-       int ok = 1;
+       struct yaffs_obj *obj;
+       int n_caches = dev->param.n_caches;
+       int i;
 
-       if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
-               ok = yaffs_CheckpointTnodeWorker(obj,
-                                           obj->variant.fileVariant.top,
-                                           obj->variant.fileVariant.topLevel,
-                                           0);
-               if (ok)
-                       ok = (yaffs_CheckpointWrite(obj->myDev, &endMarker, sizeof(endMarker)) ==
-                               sizeof(endMarker));
-       }
+       /* Find a dirty object in the cache and flush it...
+        * until there are no further dirty objects.
+        */
+       do {
+               obj = NULL;
+               for (i = 0; i < n_caches && !obj; i++) {
+                       if (dev->cache[i].object && dev->cache[i].dirty)
+                               obj = dev->cache[i].object;
+               }
+               if (obj)
+                       yaffs_flush_file_cache(obj);
+       } while (obj);
 
-       return ok ? 1 : 0;
 }
 
-static int yaffs_ReadCheckpointTnodes(yaffs_Object *obj)
+/* Grab us a cache chunk for use.
+ * First look for an empty one.
+ * Then look for the least recently used non-dirty one.
+ * Then look for the least recently used dirty one...., flush and look again.
+ */
+static struct yaffs_cache *yaffs_grab_chunk_worker(struct yaffs_dev *dev)
 {
-       __u32 baseChunk;
-       int ok = 1;
-       yaffs_Device *dev = obj->myDev;
-       yaffs_FileStructure *fileStructPtr = &obj->variant.fileVariant;
-       yaffs_Tnode *tn;
-       int nread = 0;
-       int tnodeSize = yaffs_CalcTnodeSize(dev);
-
-       ok = (yaffs_CheckpointRead(dev, &baseChunk, sizeof(baseChunk)) == sizeof(baseChunk));
-
-       while (ok && (~baseChunk)) {
-               nread++;
-               /* Read level 0 tnode */
-
-
-               tn = yaffs_GetTnodeRaw(dev);
-               if (tn)
-                       ok = (yaffs_CheckpointRead(dev, tn, tnodeSize) == tnodeSize);
-               else
-                       ok = 0;
-
-               if (tn && ok)
-                       ok = yaffs_AddOrFindLevel0Tnode(dev,
-                                                       fileStructPtr,
-                                                       baseChunk,
-                                                       tn) ? 1 : 0;
-
-               if (ok)
-                       ok = (yaffs_CheckpointRead(dev, &baseChunk, sizeof(baseChunk)) == sizeof(baseChunk));
+       int i;
 
+       if (dev->param.n_caches > 0) {
+               for (i = 0; i < dev->param.n_caches; i++) {
+                       if (!dev->cache[i].object)
+                               return &dev->cache[i];
+               }
        }
-
-       T(YAFFS_TRACE_CHECKPOINT, (
-               TSTR("Checkpoint read tnodes %d records, last %d. ok %d" TENDSTR),
-               nread, baseChunk, ok));
-
-       return ok ? 1 : 0;
+       return NULL;
 }
 
-
-static int yaffs_WriteCheckpointObjects(yaffs_Device *dev)
+static struct yaffs_cache *yaffs_grab_chunk_cache(struct yaffs_dev *dev)
 {
-       yaffs_Object *obj;
-       yaffs_CheckpointObject cp;
+       struct yaffs_cache *cache;
+       struct yaffs_obj *the_obj;
+       int usage;
        int i;
-       int ok = 1;
-       struct ylist_head *lh;
-
+       int pushout;
 
-       /* Iterate through the objects in each hash entry,
-        * dumping them to the checkpointing stream.
-        */
+       if (dev->param.n_caches < 1)
+               return NULL;
 
-       for (i = 0; ok &&  i <  YAFFS_NOBJECT_BUCKETS; i++) {
-               ylist_for_each(lh, &dev->objectBucket[i].list) {
-                       if (lh) {
-                               obj = ylist_entry(lh, yaffs_Object, hashLink);
-                               if (!obj->deferedFree) {
-                                       yaffs_ObjectToCheckpointObject(&cp, obj);
-                                       cp.structType = sizeof(cp);
+       /* Try find a non-dirty one... */
 
-                                       T(YAFFS_TRACE_CHECKPOINT, (
-                                               TSTR("Checkpoint write object %d parent %d type %d chunk %d obj addr %p" TENDSTR),
-                                               cp.objectId, cp.parentId, cp.variantType, cp.hdrChunk, obj));
+       cache = yaffs_grab_chunk_worker(dev);
 
-                                       ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
+       if (!cache) {
+               /* They were all dirty, find the LRU object and flush
+                * its cache, then  find again.
+                * NB what's here is not very accurate,
+                * we actually flush the object with the LRU chunk.
+                */
 
-                                       if (ok && obj->variantType == YAFFS_OBJECT_TYPE_FILE)
-                                               ok = yaffs_WriteCheckpointTnodes(obj);
-                               }
+               /* With locking we can't assume we can use entry zero,
+                * Set the_obj to a valid pointer for Coverity. */
+               the_obj = dev->cache[0].object;
+               usage = -1;
+               cache = NULL;
+               pushout = -1;
+
+               for (i = 0; i < dev->param.n_caches; i++) {
+                       if (dev->cache[i].object &&
+                           !dev->cache[i].locked &&
+                           (dev->cache[i].last_use < usage ||
+                           !cache)) {
+                               usage = dev->cache[i].last_use;
+                               the_obj = dev->cache[i].object;
+                               cache = &dev->cache[i];
+                               pushout = i;
                        }
                }
-       }
-
-       /* Dump end of list */
-       memset(&cp, 0xFF, sizeof(yaffs_CheckpointObject));
-       cp.structType = sizeof(cp);
-
-       if (ok)
-               ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
 
-       return ok ? 1 : 0;
+               if (!cache || cache->dirty) {
+                       /* Flush and try again */
+                       yaffs_flush_file_cache(the_obj);
+                       cache = yaffs_grab_chunk_worker(dev);
+               }
+       }
+       return cache;
 }
 
-static int yaffs_ReadCheckpointObjects(yaffs_Device *dev)
+/* Find a cached chunk */
+static struct yaffs_cache *yaffs_find_chunk_cache(const struct yaffs_obj *obj,
+                                                 int chunk_id)
 {
-       yaffs_Object *obj;
-       yaffs_CheckpointObject cp;
-       int ok = 1;
-       int done = 0;
-       yaffs_Object *hardList = NULL;
-
-       while (ok && !done) {
-               ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
-               if (cp.structType != sizeof(cp)) {
-                       T(YAFFS_TRACE_CHECKPOINT, (TSTR("struct size %d instead of %d ok %d"TENDSTR),
-                               cp.structType, (int)sizeof(cp), ok));
-                       ok = 0;
-               }
+       struct yaffs_dev *dev = obj->my_dev;
+       int i;
 
-               T(YAFFS_TRACE_CHECKPOINT, (TSTR("Checkpoint read object %d parent %d type %d chunk %d " TENDSTR),
-                       cp.objectId, cp.parentId, cp.variantType, cp.hdrChunk));
+       if (dev->param.n_caches < 1)
+               return NULL;
 
-               if (ok && cp.objectId == ~0)
-                       done = 1;
-               else if (ok) {
-                       obj = yaffs_FindOrCreateObjectByNumber(dev, cp.objectId, cp.variantType);
-                       if (obj) {
-                               ok = yaffs_CheckpointObjectToObject(obj, &cp);
-                               if (!ok)
-                                       break;
-                               if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
-                                       ok = yaffs_ReadCheckpointTnodes(obj);
-                               } else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
-                                       obj->hardLinks.next =
-                                               (struct ylist_head *) hardList;
-                                       hardList = obj;
-                               }
-                       } else
-                               ok = 0;
+       for (i = 0; i < dev->param.n_caches; i++) {
+               if (dev->cache[i].object == obj &&
+                   dev->cache[i].chunk_id == chunk_id) {
+                       dev->cache_hits++;
+
+                       return &dev->cache[i];
                }
        }
-
-       if (ok)
-               yaffs_HardlinkFixup(dev, hardList);
-
-       return ok ? 1 : 0;
+       return NULL;
 }
 
-static int yaffs_WriteCheckpointSum(yaffs_Device *dev)
+/* Mark the chunk for the least recently used algorithym */
+static void yaffs_use_cache(struct yaffs_dev *dev, struct yaffs_cache *cache,
+                           int is_write)
 {
-       __u32 checkpointSum;
-       int ok;
+       int i;
 
-       yaffs_GetCheckpointSum(dev, &checkpointSum);
+       if (dev->param.n_caches < 1)
+               return;
 
-       ok = (yaffs_CheckpointWrite(dev, &checkpointSum, sizeof(checkpointSum)) == sizeof(checkpointSum));
+       if (dev->cache_last_use < 0 ||
+               dev->cache_last_use > 100000000) {
+               /* Reset the cache usages */
+               for (i = 1; i < dev->param.n_caches; i++)
+                       dev->cache[i].last_use = 0;
 
-       if (!ok)
-               return 0;
+               dev->cache_last_use = 0;
+       }
+       dev->cache_last_use++;
+       cache->last_use = dev->cache_last_use;
 
-       return 1;
+       if (is_write)
+               cache->dirty = 1;
 }
 
-static int yaffs_ReadCheckpointSum(yaffs_Device *dev)
+/* Invalidate a single cache page.
+ * Do this when a whole page gets written,
+ * ie the short cache for this page is no longer valid.
+ */
+static void yaffs_invalidate_chunk_cache(struct yaffs_obj *object, int chunk_id)
 {
-       __u32 checkpointSum0;
-       __u32 checkpointSum1;
-       int ok;
-
-       yaffs_GetCheckpointSum(dev, &checkpointSum0);
+       struct yaffs_cache *cache;
 
-       ok = (yaffs_CheckpointRead(dev, &checkpointSum1, sizeof(checkpointSum1)) == sizeof(checkpointSum1));
-
-       if (!ok)
-               return 0;
-
-       if (checkpointSum0 != checkpointSum1)
-               return 0;
+       if (object->my_dev->param.n_caches > 0) {
+               cache = yaffs_find_chunk_cache(object, chunk_id);
 
-       return 1;
+               if (cache)
+                       cache->object = NULL;
+       }
 }
 
-
-static int yaffs_WriteCheckpointData(yaffs_Device *dev)
+/* Invalidate all the cache pages associated with this object
+ * Do this whenever ther file is deleted or resized.
+ */
+static void yaffs_invalidate_whole_cache(struct yaffs_obj *in)
 {
-       int ok = 1;
-
-       if (dev->param.skipCheckpointWrite || !dev->param.isYaffs2) {
-               T(YAFFS_TRACE_CHECKPOINT, (TSTR("skipping checkpoint write" TENDSTR)));
-               ok = 0;
-       }
-
-       if (ok)
-               ok = yaffs_CheckpointOpen(dev, 1);
+       int i;
+       struct yaffs_dev *dev = in->my_dev;
 
-       if (ok) {
-               T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint validity" TENDSTR)));
-               ok = yaffs_WriteCheckpointValidityMarker(dev, 1);
-       }
-       if (ok) {
-               T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint device" TENDSTR)));
-               ok = yaffs_WriteCheckpointDevice(dev);
-       }
-       if (ok) {
-               T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint objects" TENDSTR)));
-               ok = yaffs_WriteCheckpointObjects(dev);
-       }
-       if (ok) {
-               T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint validity" TENDSTR)));
-               ok = yaffs_WriteCheckpointValidityMarker(dev, 0);
+       if (dev->param.n_caches > 0) {
+               /* Invalidate it. */
+               for (i = 0; i < dev->param.n_caches; i++) {
+                       if (dev->cache[i].object == in)
+                               dev->cache[i].object = NULL;
+               }
        }
-
-       if (ok)
-               ok = yaffs_WriteCheckpointSum(dev);
-
-       if (!yaffs_CheckpointClose(dev))
-               ok = 0;
-
-       if (ok)
-               dev->isCheckpointed = 1;
-       else
-               dev->isCheckpointed = 0;
-
-       return dev->isCheckpointed;
 }
 
-static int yaffs_ReadCheckpointData(yaffs_Device *dev)
+static void yaffs_unhash_obj(struct yaffs_obj *obj)
 {
-       int ok = 1;
+       int bucket;
+       struct yaffs_dev *dev = obj->my_dev;
 
-       if (dev->param.skipCheckpointRead || !dev->param.isYaffs2) {
-               T(YAFFS_TRACE_CHECKPOINT, (TSTR("skipping checkpoint read" TENDSTR)));
-               ok = 0;
+       /* If it is still linked into the bucket list, free from the list */
+       if (!list_empty(&obj->hash_link)) {
+               list_del_init(&obj->hash_link);
+               bucket = yaffs_hash_fn(obj->obj_id);
+               dev->obj_bucket[bucket].count--;
        }
+}
 
-       if (ok)
-               ok = yaffs_CheckpointOpen(dev, 0); /* open for read */
+/*  FreeObject frees up a Object and puts it back on the free list */
+static void yaffs_free_obj(struct yaffs_obj *obj)
+{
+       struct yaffs_dev *dev;
 
-       if (ok) {
-               T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint validity" TENDSTR)));
-               ok = yaffs_ReadCheckpointValidityMarker(dev, 1);
-       }
-       if (ok) {
-               T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint device" TENDSTR)));
-               ok = yaffs_ReadCheckpointDevice(dev);
-       }
-       if (ok) {
-               T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint objects" TENDSTR)));
-               ok = yaffs_ReadCheckpointObjects(dev);
-       }
-       if (ok) {
-               T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint validity" TENDSTR)));
-               ok = yaffs_ReadCheckpointValidityMarker(dev, 0);
+       if (!obj) {
+               BUG();
+               return;
        }
+       dev = obj->my_dev;
+       yaffs_trace(YAFFS_TRACE_OS, "FreeObject %p inode %p",
+               obj, obj->my_inode);
+       if (obj->parent)
+               BUG();
+       if (!list_empty(&obj->siblings))
+               BUG();
 
-       if (ok) {
-               ok = yaffs_ReadCheckpointSum(dev);
-               T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint checksum %d" TENDSTR), ok));
+       if (obj->my_inode) {
+               /* We're still hooked up to a cached inode.
+                * Don't delete now, but mark for later deletion
+                */
+               obj->defered_free = 1;
+               return;
        }
 
-       if (!yaffs_CheckpointClose(dev))
-               ok = 0;
-
-       if (ok)
-               dev->isCheckpointed = 1;
-       else
-               dev->isCheckpointed = 0;
-
-       return ok ? 1 : 0;
+       yaffs_unhash_obj(obj);
 
+       yaffs_free_raw_obj(dev, obj);
+       dev->n_obj--;
+       dev->checkpoint_blocks_required = 0;    /* force recalculation */
 }
 
-static void yaffs_InvalidateCheckpoint(yaffs_Device *dev)
+void yaffs_handle_defered_free(struct yaffs_obj *obj)
 {
-       if (dev->isCheckpointed ||
-                       dev->blocksInCheckpoint > 0) {
-               dev->isCheckpointed = 0;
-               yaffs_CheckpointInvalidateStream(dev);
-       }
-       if (dev->param.markSuperBlockDirty)
-               dev->param.markSuperBlockDirty(dev);
+       if (obj->defered_free)
+               yaffs_free_obj(obj);
 }
 
-
-int yaffs_CheckpointSave(yaffs_Device *dev)
+static int yaffs_generic_obj_del(struct yaffs_obj *in)
 {
+       /* Iinvalidate the file's data in the cache, without flushing. */
+       yaffs_invalidate_whole_cache(in);
 
-       T(YAFFS_TRACE_CHECKPOINT, (TSTR("save entry: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
-
-       yaffs_VerifyObjects(dev);
-       yaffs_VerifyBlocks(dev);
-       yaffs_VerifyFreeChunks(dev);
-
-       if (!dev->isCheckpointed) {
-               yaffs_InvalidateCheckpoint(dev);
-               yaffs_WriteCheckpointData(dev);
+       if (in->my_dev->param.is_yaffs2 && in->parent != in->my_dev->del_dir) {
+               /* Move to unlinked directory so we have a deletion record */
+               yaffs_change_obj_name(in, in->my_dev->del_dir, _Y("deleted"), 0,
+                                     0);
        }
 
-       T(YAFFS_TRACE_ALWAYS, (TSTR("save exit: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
+       yaffs_remove_obj_from_dir(in);
+       yaffs_chunk_del(in->my_dev, in->hdr_chunk, 1, __LINE__);
+       in->hdr_chunk = 0;
+
+       yaffs_free_obj(in);
+       return YAFFS_OK;
 
-       return dev->isCheckpointed;
 }
 
-int yaffs_CheckpointRestore(yaffs_Device *dev)
+static void yaffs_soft_del_file(struct yaffs_obj *obj)
 {
-       int retval;
-       T(YAFFS_TRACE_CHECKPOINT, (TSTR("restore entry: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
-
-       retval = yaffs_ReadCheckpointData(dev);
+       if (!obj->deleted ||
+           obj->variant_type != YAFFS_OBJECT_TYPE_FILE ||
+           obj->soft_del)
+               return;
 
-       if (dev->isCheckpointed) {
-               yaffs_VerifyObjects(dev);
-               yaffs_VerifyBlocks(dev);
-               yaffs_VerifyFreeChunks(dev);
+       if (obj->n_data_chunks <= 0) {
+               /* Empty file with no duplicate object headers,
+                * just delete it immediately */
+               yaffs_free_tnode(obj->my_dev, obj->variant.file_variant.top);
+               obj->variant.file_variant.top = NULL;
+               yaffs_trace(YAFFS_TRACE_TRACING,
+                       "yaffs: Deleting empty file %d",
+                       obj->obj_id);
+               yaffs_generic_obj_del(obj);
+       } else {
+               yaffs_soft_del_worker(obj,
+                                     obj->variant.file_variant.top,
+                                     obj->variant.
+                                     file_variant.top_level, 0);
+               obj->soft_del = 1;
        }
-
-       T(YAFFS_TRACE_CHECKPOINT, (TSTR("restore exit: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
-
-       return retval;
 }
 
-/*--------------------- File read/write ------------------------
- * Read and write have very similar structures.
- * In general the read/write has three parts to it
- * An incomplete chunk to start with (if the read/write is not chunk-aligned)
- * Some complete chunks
- * An incomplete chunk to end off with
+/* Pruning removes any part of the file structure tree that is beyond the
+ * bounds of the file (ie that does not point to chunks).
  *
- * Curve-balls: the first chunk might also be the last chunk.
+ * A file should only get pruned when its size is reduced.
+ *
+ * Before pruning, the chunks must be pulled from the tree and the
+ * level 0 tnode entries must be zeroed out.
+ * Could also use this for file deletion, but that's probably better handled
+ * by a special case.
+ *
+ * This function is recursive. For levels > 0 the function is called again on
+ * any sub-tree. For level == 0 we just check if the sub-tree has data.
+ * If there is no data in a subtree then it is pruned.
  */
 
-int yaffs_ReadDataFromFile(yaffs_Object *in, __u8 *buffer, loff_t offset,
-                       int nBytes)
+static struct yaffs_tnode *yaffs_prune_worker(struct yaffs_dev *dev,
+                                             struct yaffs_tnode *tn, u32 level,
+                                             int del0)
 {
+       int i;
+       int has_data;
 
-       int chunk;
-       __u32 start;
-       int nToCopy;
-       int n = nBytes;
-       int nDone = 0;
-       yaffs_ChunkCache *cache;
+       if (!tn)
+               return tn;
+
+       has_data = 0;
+
+       if (level > 0) {
+               for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
+                       if (tn->internal[i]) {
+                               tn->internal[i] =
+                                   yaffs_prune_worker(dev,
+                                               tn->internal[i],
+                                               level - 1,
+                                               (i == 0) ? del0 : 1);
+                       }
 
-       yaffs_Device *dev;
+                       if (tn->internal[i])
+                               has_data++;
+               }
+       } else {
+               int tnode_size_u32 = dev->tnode_size / sizeof(u32);
+               u32 *map = (u32 *) tn;
 
-       dev = in->myDev;
+               for (i = 0; !has_data && i < tnode_size_u32; i++) {
+                       if (map[i])
+                               has_data++;
+               }
+       }
 
-       while (n > 0) {
-               /* chunk = offset / dev->nDataBytesPerChunk + 1; */
-               /* start = offset % dev->nDataBytesPerChunk; */
-               yaffs_AddrToChunk(dev, offset, &chunk, &start);
-               chunk++;
+       if (has_data == 0 && del0) {
+               /* Free and return NULL */
+               yaffs_free_tnode(dev, tn);
+               tn = NULL;
+       }
+       return tn;
+}
 
-               /* OK now check for the curveball where the start and end are in
-                * the same chunk.
-                */
-               if ((start + n) < dev->nDataBytesPerChunk)
-                       nToCopy = n;
-               else
-                       nToCopy = dev->nDataBytesPerChunk - start;
+static int yaffs_prune_tree(struct yaffs_dev *dev,
+                           struct yaffs_file_var *file_struct)
+{
+       int i;
+       int has_data;
+       int done = 0;
+       struct yaffs_tnode *tn;
 
-               cache = yaffs_FindChunkCache(in, chunk);
+       if (file_struct->top_level < 1)
+               return YAFFS_OK;
 
-               /* If the chunk is already in the cache or it is less than a whole chunk
-                * or we're using inband tags then use the cache (if there is caching)
-                * else bypass the cache.
-                */
-               if (cache || nToCopy != dev->nDataBytesPerChunk || dev->param.inbandTags) {
-                       if (dev->param.nShortOpCaches > 0) {
+       file_struct->top =
+          yaffs_prune_worker(dev, file_struct->top, file_struct->top_level, 0);
 
-                               /* If we can't find the data in the cache, then load it up. */
+       /* Now we have a tree with all the non-zero branches NULL but
+        * the height is the same as it was.
+        * Let's see if we can trim internal tnodes to shorten the tree.
+        * We can do this if only the 0th element in the tnode is in use
+        * (ie all the non-zero are NULL)
+        */
 
-                               if (!cache) {
-                                       cache = yaffs_GrabChunkCache(in->myDev);
-                                       cache->object = in;
-                                       cache->chunkId = chunk;
-                                       cache->dirty = 0;
-                                       cache->locked = 0;
-                                       yaffs_ReadChunkDataFromObject(in, chunk,
-                                                                     cache->
-                                                                     data);
-                                       cache->nBytes = 0;
-                               }
+       while (file_struct->top_level && !done) {
+               tn = file_struct->top;
 
-                               yaffs_UseChunkCache(dev, cache, 0);
+               has_data = 0;
+               for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
+                       if (tn->internal[i])
+                               has_data++;
+               }
 
-                               cache->locked = 1;
+               if (!has_data) {
+                       file_struct->top = tn->internal[0];
+                       file_struct->top_level--;
+                       yaffs_free_tnode(dev, tn);
+               } else {
+                       done = 1;
+               }
+       }
 
+       return YAFFS_OK;
+}
 
-                               memcpy(buffer, &cache->data[start], nToCopy);
+/*-------------------- End of File Structure functions.-------------------*/
 
-                               cache->locked = 0;
-                       } else {
-                               /* Read into the local buffer then copy..*/
+/* alloc_empty_obj gets us a clean Object.*/
+static struct yaffs_obj *yaffs_alloc_empty_obj(struct yaffs_dev *dev)
+{
+       struct yaffs_obj *obj = yaffs_alloc_raw_obj(dev);
 
-                               __u8 *localBuffer =
-                                   yaffs_GetTempBuffer(dev, __LINE__);
-                               yaffs_ReadChunkDataFromObject(in, chunk,
-                                                             localBuffer);
+       if (!obj)
+               return obj;
 
-                               memcpy(buffer, &localBuffer[start], nToCopy);
+       dev->n_obj++;
 
+       /* Now sweeten it up... */
 
-                               yaffs_ReleaseTempBuffer(dev, localBuffer,
-                                                       __LINE__);
-                       }
+       memset(obj, 0, sizeof(struct yaffs_obj));
+       obj->being_created = 1;
 
-               } else {
+       obj->my_dev = dev;
+       obj->hdr_chunk = 0;
+       obj->variant_type = YAFFS_OBJECT_TYPE_UNKNOWN;
+       INIT_LIST_HEAD(&(obj->hard_links));
+       INIT_LIST_HEAD(&(obj->hash_link));
+       INIT_LIST_HEAD(&obj->siblings);
 
-                       /* A full chunk. Read directly into the supplied buffer. */
-                       yaffs_ReadChunkDataFromObject(in, chunk, buffer);
+       /* Now make the directory sane */
+       if (dev->root_dir) {
+               obj->parent = dev->root_dir;
+               list_add(&(obj->siblings),
+                        &dev->root_dir->variant.dir_variant.children);
+       }
 
-               }
+       /* Add it to the lost and found directory.
+        * NB Can't put root or lost-n-found in lost-n-found so
+        * check if lost-n-found exists first
+        */
+       if (dev->lost_n_found)
+               yaffs_add_obj_to_dir(dev->lost_n_found, obj);
 
-               n -= nToCopy;
-               offset += nToCopy;
-               buffer += nToCopy;
-               nDone += nToCopy;
+       obj->being_created = 0;
 
-       }
+       dev->checkpoint_blocks_required = 0;    /* force recalculation */
 
-       return nDone;
+       return obj;
 }
 
-int yaffs_DoWriteDataToFile(yaffs_Object *in, const __u8 *buffer, loff_t offset,
-                       int nBytes, int writeThrough)
+static int yaffs_find_nice_bucket(struct yaffs_dev *dev)
 {
+       int i;
+       int l = 999;
+       int lowest = 999999;
 
-       int chunk;
-       __u32 start;
-       int nToCopy;
-       int n = nBytes;
-       int nDone = 0;
-       int nToWriteBack;
-       int startOfWrite = offset;
-       int chunkWritten = 0;
-       __u32 nBytesRead;
-       __u32 chunkStart;
-
-       yaffs_Device *dev;
-
-       dev = in->myDev;
-
-       while (n > 0 && chunkWritten >= 0) {
-               /* chunk = offset / dev->nDataBytesPerChunk + 1; */
-               /* start = offset % dev->nDataBytesPerChunk; */
-               yaffs_AddrToChunk(dev, offset, &chunk, &start);
-
-               if (chunk * dev->nDataBytesPerChunk + start != offset ||
-                               start >= dev->nDataBytesPerChunk) {
-                       T(YAFFS_TRACE_ERROR, (
-                          TSTR("AddrToChunk of offset %d gives chunk %d start %d"
-                          TENDSTR),
-                          (int)offset, chunk, start));
-               }
-               chunk++;
+       /* Search for the shortest list or one that
+        * isn't too long.
+        */
 
-               /* OK now check for the curveball where the start and end are in
-                * the same chunk.
-                */
+       for (i = 0; i < 10 && lowest > 4; i++) {
+               dev->bucket_finder++;
+               dev->bucket_finder %= YAFFS_NOBJECT_BUCKETS;
+               if (dev->obj_bucket[dev->bucket_finder].count < lowest) {
+                       lowest = dev->obj_bucket[dev->bucket_finder].count;
+                       l = dev->bucket_finder;
+               }
+       }
 
-               if ((start + n) < dev->nDataBytesPerChunk) {
-                       nToCopy = n;
+       return l;
+}
 
-                       /* Now folks, to calculate how many bytes to write back....
-                        * If we're overwriting and not writing to then end of file then
-                        * we need to write back as much as was there before.
-                        */
+static int yaffs_new_obj_id(struct yaffs_dev *dev)
+{
+       int bucket = yaffs_find_nice_bucket(dev);
+       int found = 0;
+       struct list_head *i;
+       u32 n = (u32) bucket;
 
-                       chunkStart = ((chunk - 1) * dev->nDataBytesPerChunk);
+       /* Now find an object value that has not already been taken
+        * by scanning the list.
+        */
 
-                       if (chunkStart > in->variant.fileVariant.fileSize)
-                               nBytesRead = 0; /* Past end of file */
-                       else
-                               nBytesRead = in->variant.fileVariant.fileSize - chunkStart;
+       while (!found) {
+               found = 1;
+               n += YAFFS_NOBJECT_BUCKETS;
+               if (1 || dev->obj_bucket[bucket].count > 0) {
+                       list_for_each(i, &dev->obj_bucket[bucket].list) {
+                               /* If there is already one in the list */
+                               if (i && list_entry(i, struct yaffs_obj,
+                                                   hash_link)->obj_id == n) {
+                                       found = 0;
+                               }
+                       }
+               }
+       }
+       return n;
+}
 
-                       if (nBytesRead > dev->nDataBytesPerChunk)
-                               nBytesRead = dev->nDataBytesPerChunk;
+static void yaffs_hash_obj(struct yaffs_obj *in)
+{
+       int bucket = yaffs_hash_fn(in->obj_id);
+       struct yaffs_dev *dev = in->my_dev;
 
-                       nToWriteBack =
-                           (nBytesRead >
-                            (start + n)) ? nBytesRead : (start + n);
+       list_add(&in->hash_link, &dev->obj_bucket[bucket].list);
+       dev->obj_bucket[bucket].count++;
+}
 
-                       if (nToWriteBack < 0 || nToWriteBack > dev->nDataBytesPerChunk)
-                               YBUG();
+struct yaffs_obj *yaffs_find_by_number(struct yaffs_dev *dev, u32 number)
+{
+       int bucket = yaffs_hash_fn(number);
+       struct list_head *i;
+       struct yaffs_obj *in;
 
-               } else {
-                       nToCopy = dev->nDataBytesPerChunk - start;
-                       nToWriteBack = dev->nDataBytesPerChunk;
+       list_for_each(i, &dev->obj_bucket[bucket].list) {
+               /* Look if it is in the list */
+               in = list_entry(i, struct yaffs_obj, hash_link);
+               if (in->obj_id == number) {
+                       /* Don't show if it is defered free */
+                       if (in->defered_free)
+                               return NULL;
+                       return in;
                }
+       }
 
-               if (nToCopy != dev->nDataBytesPerChunk || dev->param.inbandTags) {
-                       /* An incomplete start or end chunk (or maybe both start and end chunk),
-                        * or we're using inband tags, so we want to use the cache buffers.
-                        */
-                       if (dev->param.nShortOpCaches > 0) {
-                               yaffs_ChunkCache *cache;
-                               /* If we can't find the data in the cache, then load the cache */
-                               cache = yaffs_FindChunkCache(in, chunk);
-
-                               if (!cache
-                                   && yaffs_CheckSpaceForAllocation(dev, 1)) {
-                                       cache = yaffs_GrabChunkCache(dev);
-                                       cache->object = in;
-                                       cache->chunkId = chunk;
-                                       cache->dirty = 0;
-                                       cache->locked = 0;
-                                       yaffs_ReadChunkDataFromObject(in, chunk,
-                                                                     cache->data);
-                               } else if (cache &&
-                                       !cache->dirty &&
-                                       !yaffs_CheckSpaceForAllocation(dev, 1)) {
-                                       /* Drop the cache if it was a read cache item and
-                                        * no space check has been made for it.
-                                        */
-                                        cache = NULL;
-                               }
-
-                               if (cache) {
-                                       yaffs_UseChunkCache(dev, cache, 1);
-                                       cache->locked = 1;
-
+       return NULL;
+}
 
-                                       memcpy(&cache->data[start], buffer,
-                                              nToCopy);
+struct yaffs_obj *yaffs_new_obj(struct yaffs_dev *dev, int number,
+                               enum yaffs_obj_type type)
+{
+       struct yaffs_obj *the_obj = NULL;
+       struct yaffs_tnode *tn = NULL;
 
+       if (number < 0)
+               number = yaffs_new_obj_id(dev);
 
-                                       cache->locked = 0;
-                                       cache->nBytes = nToWriteBack;
+       if (type == YAFFS_OBJECT_TYPE_FILE) {
+               tn = yaffs_get_tnode(dev);
+               if (!tn)
+                       return NULL;
+       }
 
-                                       if (writeThrough) {
-                                               chunkWritten =
-                                                   yaffs_WriteChunkDataToObject
-                                                   (cache->object,
-                                                    cache->chunkId,
-                                                    cache->data, cache->nBytes,
-                                                    1);
-                                               cache->dirty = 0;
-                                       }
+       the_obj = yaffs_alloc_empty_obj(dev);
+       if (!the_obj) {
+               if (tn)
+                       yaffs_free_tnode(dev, tn);
+               return NULL;
+       }
 
-                               } else {
-                                       chunkWritten = -1;      /* fail the write */
-                               }
-                       } else {
-                               /* An incomplete start or end chunk (or maybe both start and end chunk)
-                                * Read into the local buffer then copy, then copy over and write back.
-                                */
+       the_obj->fake = 0;
+       the_obj->rename_allowed = 1;
+       the_obj->unlink_allowed = 1;
+       the_obj->obj_id = number;
+       yaffs_hash_obj(the_obj);
+       the_obj->variant_type = type;
+       yaffs_load_current_time(the_obj, 1, 1);
 
-                               __u8 *localBuffer =
-                                   yaffs_GetTempBuffer(dev, __LINE__);
+       switch (type) {
+       case YAFFS_OBJECT_TYPE_FILE:
+               the_obj->variant.file_variant.file_size = 0;
+               the_obj->variant.file_variant.scanned_size = 0;
+               the_obj->variant.file_variant.shrink_size =
+                                               yaffs_max_file_size(dev);
+               the_obj->variant.file_variant.top_level = 0;
+               the_obj->variant.file_variant.top = tn;
+               break;
+       case YAFFS_OBJECT_TYPE_DIRECTORY:
+               INIT_LIST_HEAD(&the_obj->variant.dir_variant.children);
+               INIT_LIST_HEAD(&the_obj->variant.dir_variant.dirty);
+               break;
+       case YAFFS_OBJECT_TYPE_SYMLINK:
+       case YAFFS_OBJECT_TYPE_HARDLINK:
+       case YAFFS_OBJECT_TYPE_SPECIAL:
+               /* No action required */
+               break;
+       case YAFFS_OBJECT_TYPE_UNKNOWN:
+               /* todo this should not happen */
+               break;
+       }
+       return the_obj;
+}
 
-                               yaffs_ReadChunkDataFromObject(in, chunk,
-                                                             localBuffer);
+static struct yaffs_obj *yaffs_create_fake_dir(struct yaffs_dev *dev,
+                                              int number, u32 mode)
+{
 
+       struct yaffs_obj *obj =
+           yaffs_new_obj(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
 
+       if (!obj)
+               return NULL;
 
-                               memcpy(&localBuffer[start], buffer, nToCopy);
+       obj->fake = 1;  /* it is fake so it might not use NAND */
+       obj->rename_allowed = 0;
+       obj->unlink_allowed = 0;
+       obj->deleted = 0;
+       obj->unlinked = 0;
+       obj->yst_mode = mode;
+       obj->my_dev = dev;
+       obj->hdr_chunk = 0;     /* Not a valid chunk. */
+       return obj;
 
-                               chunkWritten =
-                                   yaffs_WriteChunkDataToObject(in, chunk,
-                                                                localBuffer,
-                                                                nToWriteBack,
-                                                                0);
+}
 
-                               yaffs_ReleaseTempBuffer(dev, localBuffer,
-                                                       __LINE__);
 
-                       }
+static void yaffs_init_tnodes_and_objs(struct yaffs_dev *dev)
+{
+       int i;
 
-               } else {
-                       /* A full chunk. Write directly from the supplied buffer. */
+       dev->n_obj = 0;
+       dev->n_tnodes = 0;
+       yaffs_init_raw_tnodes_and_objs(dev);
 
+       for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
+               INIT_LIST_HEAD(&dev->obj_bucket[i].list);
+               dev->obj_bucket[i].count = 0;
+       }
+}
 
+struct yaffs_obj *yaffs_find_or_create_by_number(struct yaffs_dev *dev,
+                                                int number,
+                                                enum yaffs_obj_type type)
+{
+       struct yaffs_obj *the_obj = NULL;
 
-                       chunkWritten =
-                           yaffs_WriteChunkDataToObject(in, chunk, buffer,
-                                                        dev->nDataBytesPerChunk,
-                                                        0);
+       if (number > 0)
+               the_obj = yaffs_find_by_number(dev, number);
 
-                       /* Since we've overwritten the cached data, we better invalidate it. */
-                       yaffs_InvalidateChunkCache(in, chunk);
-               }
+       if (!the_obj)
+               the_obj = yaffs_new_obj(dev, number, type);
 
-               if (chunkWritten >= 0) {
-                       n -= nToCopy;
-                       offset += nToCopy;
-                       buffer += nToCopy;
-                       nDone += nToCopy;
-               }
+       return the_obj;
 
-       }
+}
 
-       /* Update file object */
+YCHAR *yaffs_clone_str(const YCHAR *str)
+{
+       YCHAR *new_str = NULL;
+       int len;
 
-       if ((startOfWrite + nDone) > in->variant.fileVariant.fileSize)
-               in->variant.fileVariant.fileSize = (startOfWrite + nDone);
+       if (!str)
+               str = _Y("");
 
-       in->dirty = 1;
+       len = strnlen(str, YAFFS_MAX_ALIAS_LENGTH);
+       new_str = kmalloc((len + 1) * sizeof(YCHAR), GFP_NOFS);
+       if (new_str) {
+               strncpy(new_str, str, len);
+               new_str[len] = 0;
+       }
+       return new_str;
 
-       return nDone;
 }
+/*
+ *yaffs_update_parent() handles fixing a directories mtime and ctime when a new
+ * link (ie. name) is created or deleted in the directory.
+ *
+ * ie.
+ *   create dir/a : update dir's mtime/ctime
+ *   rm dir/a:   update dir's mtime/ctime
+ *   modify dir/a: don't update dir's mtimme/ctime
+ *
+ * This can be handled immediately or defered. Defering helps reduce the number
+ * of updates when many files in a directory are changed within a brief period.
+ *
+ * If the directory updating is defered then yaffs_update_dirty_dirs must be
+ * called periodically.
+ */
 
-int yaffs_WriteDataToFile(yaffs_Object *in, const __u8 *buffer, loff_t offset,
-                       int nBytes, int writeThrough)
+static void yaffs_update_parent(struct yaffs_obj *obj)
 {
-       yaffs_HandleHole(in,offset);
-       return yaffs_DoWriteDataToFile(in,buffer,offset,nBytes,writeThrough);
-}
-
+       struct yaffs_dev *dev;
 
+       if (!obj)
+               return;
+       dev = obj->my_dev;
+       obj->dirty = 1;
+       yaffs_load_current_time(obj, 0, 1);
+       if (dev->param.defered_dir_update) {
+               struct list_head *link = &obj->variant.dir_variant.dirty;
+
+               if (list_empty(link)) {
+                       list_add(link, &dev->dirty_dirs);
+                       yaffs_trace(YAFFS_TRACE_BACKGROUND,
+                         "Added object %d to dirty directories",
+                          obj->obj_id);
+               }
 
-/* ---------------------- File resizing stuff ------------------ */
+       } else {
+               yaffs_update_oh(obj, NULL, 0, 0, 0, NULL);
+       }
+}
 
-static void yaffs_PruneResizedChunks(yaffs_Object *in, int newSize)
+void yaffs_update_dirty_dirs(struct yaffs_dev *dev)
 {
+       struct list_head *link;
+       struct yaffs_obj *obj;
+       struct yaffs_dir_var *d_s;
+       union yaffs_obj_var *o_v;
 
-       yaffs_Device *dev = in->myDev;
-       int oldFileSize = in->variant.fileVariant.fileSize;
+       yaffs_trace(YAFFS_TRACE_BACKGROUND, "Update dirty directories");
 
-       int lastDel = 1 + (oldFileSize - 1) / dev->nDataBytesPerChunk;
+       while (!list_empty(&dev->dirty_dirs)) {
+               link = dev->dirty_dirs.next;
+               list_del_init(link);
 
-       int startDel = 1 + (newSize + dev->nDataBytesPerChunk - 1) /
-           dev->nDataBytesPerChunk;
-       int i;
-       int chunkId;
+               d_s = list_entry(link, struct yaffs_dir_var, dirty);
+               o_v = list_entry(d_s, union yaffs_obj_var, dir_variant);
+               obj = list_entry(o_v, struct yaffs_obj, variant);
 
-       /* Delete backwards so that we don't end up with holes if
-        * power is lost part-way through the operation.
-        */
-       for (i = lastDel; i >= startDel; i--) {
-               /* NB this could be optimised somewhat,
-                * eg. could retrieve the tags and write them without
-                * using yaffs_DeleteChunk
-                */
+               yaffs_trace(YAFFS_TRACE_BACKGROUND, "Update directory %d",
+                       obj->obj_id);
 
-               chunkId = yaffs_FindAndDeleteChunkInFile(in, i, NULL);
-               if (chunkId > 0) {
-                       if (chunkId <
-                           (dev->internalStartBlock * dev->param.nChunksPerBlock)
-                           || chunkId >=
-                           ((dev->internalEndBlock +
-                             1) * dev->param.nChunksPerBlock)) {
-                               T(YAFFS_TRACE_ALWAYS,
-                                 (TSTR("Found daft chunkId %d for %d" TENDSTR),
-                                  chunkId, i));
-                       } else {
-                               in->nDataChunks--;
-                               yaffs_DeleteChunk(dev, chunkId, 1, __LINE__);
-                       }
-               }
+               if (obj->dirty)
+                       yaffs_update_oh(obj, NULL, 0, 0, 0, NULL);
        }
-
 }
 
+/*
+ * Mknod (create) a new object.
+ * equiv_obj only has meaning for a hard link;
+ * alias_str only has meaning for a symlink.
+ * rdev only has meaning for devices (a subset of special objects)
+ */
 
-static void yaffs_ResizeDown( yaffs_Object *obj, loff_t newSize)
+static struct yaffs_obj *yaffs_create_obj(enum yaffs_obj_type type,
+                                         struct yaffs_obj *parent,
+                                         const YCHAR *name,
+                                         u32 mode,
+                                         u32 uid,
+                                         u32 gid,
+                                         struct yaffs_obj *equiv_obj,
+                                         const YCHAR *alias_str, u32 rdev)
 {
-       int newFullChunks;
-       __u32 newSizeOfPartialChunk;
-       yaffs_Device *dev = obj->myDev;
-
-       yaffs_AddrToChunk(dev, newSize, &newFullChunks, &newSizeOfPartialChunk);
-
-       yaffs_PruneResizedChunks(obj, newSize);
-
-       if (newSizeOfPartialChunk != 0) {
-               int lastChunk = 1 + newFullChunks;
-               __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
-
-               /* Got to read and rewrite the last chunk with its new size and zero pad */
-               yaffs_ReadChunkDataFromObject(obj, lastChunk, localBuffer);
-               memset(localBuffer + newSizeOfPartialChunk, 0,
-                       dev->nDataBytesPerChunk - newSizeOfPartialChunk);
+       struct yaffs_obj *in;
+       YCHAR *str = NULL;
+       struct yaffs_dev *dev = parent->my_dev;
 
-               yaffs_WriteChunkDataToObject(obj, lastChunk, localBuffer,
-                                            newSizeOfPartialChunk, 1);
+       /* Check if the entry exists.
+        * If it does then fail the call since we don't want a dup. */
+       if (yaffs_find_by_name(parent, name))
+               return NULL;
 
-               yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
+       if (type == YAFFS_OBJECT_TYPE_SYMLINK) {
+               str = yaffs_clone_str(alias_str);
+               if (!str)
+                       return NULL;
        }
 
-       obj->variant.fileVariant.fileSize = newSize;
-
-       yaffs_PruneFileStructure(dev, &obj->variant.fileVariant);
-}
+       in = yaffs_new_obj(dev, -1, type);
 
+       if (!in) {
+               kfree(str);
+               return NULL;
+       }
 
-static int yaffs_HandleHole(yaffs_Object *obj, loff_t newSize)
-{
-       /* if newsSize > oldFileSize.
-        * We're going to be writing a hole.
-        * If the hole is small then write zeros otherwise write a start of hole marker.
-        */
-               
-
-       loff_t oldFileSize;
-       int increase;
-       int smallHole   ;
-       int result = YAFFS_OK;
-       yaffs_Device *dev = NULL;
-
-       __u8 *localBuffer = NULL;
-       
-       int smallIncreaseOk = 0;
-       
-       if(!obj)
-               return YAFFS_FAIL;
+       in->hdr_chunk = 0;
+       in->valid = 1;
+       in->variant_type = type;
 
-       if(obj->variantType != YAFFS_OBJECT_TYPE_FILE)
-               return YAFFS_FAIL;
-       
-       dev = obj->myDev;
-       
-       /* Bail out if not yaffs2 mode */
-       if(!dev->param.isYaffs2)
-               return YAFFS_OK;
+       in->yst_mode = mode;
 
-       oldFileSize = obj->variant.fileVariant.fileSize;
+       yaffs_attribs_init(in, gid, uid, rdev);
 
-       if (newSize <= oldFileSize)
-               return YAFFS_OK;
+       in->n_data_chunks = 0;
 
-       increase = newSize - oldFileSize;
+       yaffs_set_obj_name(in, name);
+       in->dirty = 1;
 
-       if(increase < YAFFS_SMALL_HOLE_THRESHOLD * dev->nDataBytesPerChunk &&
-               yaffs_CheckSpaceForAllocation(dev, YAFFS_SMALL_HOLE_THRESHOLD + 1))
-               smallHole = 1;
-       else
-               smallHole = 0;
-
-       if(smallHole)
-               localBuffer= yaffs_GetTempBuffer(dev, __LINE__);
-       
-       if(localBuffer){
-               /* fill hole with zero bytes */
-               int pos = oldFileSize;
-               int thisWrite;
-               int written;
-               memset(localBuffer,0,dev->nDataBytesPerChunk);
-               smallIncreaseOk = 1;
-
-               while(increase > 0 && smallIncreaseOk){
-                       thisWrite = increase;
-                       if(thisWrite > dev->nDataBytesPerChunk)
-                               thisWrite = dev->nDataBytesPerChunk;
-                       written = yaffs_DoWriteDataToFile(obj,localBuffer,pos,thisWrite,0);
-                       if(written == thisWrite){
-                               pos += thisWrite;
-                               increase -= thisWrite;
-                       } else
-                               smallIncreaseOk = 0;
-               }
+       yaffs_add_obj_to_dir(parent, in);
 
-               yaffs_ReleaseTempBuffer(dev,localBuffer,__LINE__);
+       in->my_dev = parent->my_dev;
 
-               /* If we were out of space then reverse any chunks we've added */               
-               if(!smallIncreaseOk)
-                       yaffs_ResizeDown(obj, oldFileSize);
+       switch (type) {
+       case YAFFS_OBJECT_TYPE_SYMLINK:
+               in->variant.symlink_variant.alias = str;
+               break;
+       case YAFFS_OBJECT_TYPE_HARDLINK:
+               in->variant.hardlink_variant.equiv_obj = equiv_obj;
+               in->variant.hardlink_variant.equiv_id = equiv_obj->obj_id;
+               list_add(&in->hard_links, &equiv_obj->hard_links);
+               break;
+       case YAFFS_OBJECT_TYPE_FILE:
+       case YAFFS_OBJECT_TYPE_DIRECTORY:
+       case YAFFS_OBJECT_TYPE_SPECIAL:
+       case YAFFS_OBJECT_TYPE_UNKNOWN:
+               /* do nothing */
+               break;
        }
-       
-       if (!smallIncreaseOk &&
-               obj->parent &&
-               obj->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
-               obj->parent->objectId != YAFFS_OBJECTID_DELETED){
-               /* Write a hole start header with the old file size */
-               yaffs_UpdateObjectHeader(obj, NULL, 0,1,0);
+
+       if (yaffs_update_oh(in, name, 0, 0, 0, NULL) < 0) {
+               /* Could not create the object header, fail */
+               yaffs_del_obj(in);
+               in = NULL;
        }
 
-       return result;
+       if (in)
+               yaffs_update_parent(parent);
 
+       return in;
 }
 
-int yaffs_ResizeFile(yaffs_Object *in, loff_t newSize)
+struct yaffs_obj *yaffs_create_file(struct yaffs_obj *parent,
+                                   const YCHAR *name, u32 mode, u32 uid,
+                                   u32 gid)
 {
-       yaffs_Device *dev = in->myDev;
-       int oldFileSize = in->variant.fileVariant.fileSize;
+       return yaffs_create_obj(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
+                               uid, gid, NULL, NULL, 0);
+}
 
-       yaffs_FlushFilesChunkCache(in);
-       yaffs_InvalidateWholeChunkCache(in);
+struct yaffs_obj *yaffs_create_dir(struct yaffs_obj *parent, const YCHAR *name,
+                                  u32 mode, u32 uid, u32 gid)
+{
+       return yaffs_create_obj(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
+                               mode, uid, gid, NULL, NULL, 0);
+}
 
-       yaffs_CheckGarbageCollection(dev);
+struct yaffs_obj *yaffs_create_special(struct yaffs_obj *parent,
+                                      const YCHAR *name, u32 mode, u32 uid,
+                                      u32 gid, u32 rdev)
+{
+       return yaffs_create_obj(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
+                               uid, gid, NULL, NULL, rdev);
+}
 
-       if (in->variantType != YAFFS_OBJECT_TYPE_FILE)
-               return YAFFS_FAIL;
+struct yaffs_obj *yaffs_create_symlink(struct yaffs_obj *parent,
+                                      const YCHAR *name, u32 mode, u32 uid,
+                                      u32 gid, const YCHAR *alias)
+{
+       return yaffs_create_obj(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
+                               uid, gid, NULL, alias, 0);
+}
 
-       if (newSize == oldFileSize)
-               return YAFFS_OK;
-               
-       if(newSize > oldFileSize){
-               yaffs_HandleHole(in,newSize);
-               in->variant.fileVariant.fileSize = newSize;
-       } else {
-               /* newSize < oldFileSize */ 
-               yaffs_ResizeDown(in, newSize);
-       } 
+/* yaffs_link_obj returns the object id of the equivalent object.*/
+struct yaffs_obj *yaffs_link_obj(struct yaffs_obj *parent, const YCHAR * name,
+                                struct yaffs_obj *equiv_obj)
+{
+       /* Get the real object in case we were fed a hard link obj */
+       equiv_obj = yaffs_get_equivalent_obj(equiv_obj);
 
-       /* Write a new object header to reflect the resize.
-        * show we've shrunk the file, if need be
-        * Do this only if the file is not in the deleted directories
-        * and is not shadowed.
-        */
-       if (in->parent &&
-           !in->isShadowed &&
-           in->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
-           in->parent->objectId != YAFFS_OBJECTID_DELETED)
-               yaffs_UpdateObjectHeader(in, NULL, 0,0,0);
+       if (yaffs_create_obj(YAFFS_OBJECT_TYPE_HARDLINK,
+                       parent, name, 0, 0, 0,
+                       equiv_obj, NULL, 0))
+               return equiv_obj;
 
+       return NULL;
 
-       return YAFFS_OK;
 }
 
-loff_t yaffs_GetFileSize(yaffs_Object *obj)
-{
-       YCHAR *alias = NULL;
-       obj = yaffs_GetEquivalentObject(obj);
-
-       switch (obj->variantType) {
-       case YAFFS_OBJECT_TYPE_FILE:
-               return obj->variant.fileVariant.fileSize;
-       case YAFFS_OBJECT_TYPE_SYMLINK:
-               alias = obj->variant.symLinkVariant.alias;
-               if(!alias)
-                       return 0;
-               return yaffs_strnlen(alias,YAFFS_MAX_ALIAS_LENGTH);
-       default:
-               return 0;
-       }
-}
 
 
+/*---------------------- Block Management and Page Allocation -------------*/
 
-int yaffs_FlushFile(yaffs_Object *in, int updateTime, int dataSync)
+static void yaffs_deinit_blocks(struct yaffs_dev *dev)
 {
-       int retVal;
-       if (in->dirty) {
-               yaffs_FlushFilesChunkCache(in);
-               if(dataSync) /* Only sync data */
-                       retVal=YAFFS_OK;
-               else {
-                       if (updateTime) {
-#ifdef CONFIG_YAFFS_WINCE
-                               yfsd_WinFileTimeNow(in->win_mtime);
-#else
-
-                               in->yst_mtime = Y_CURRENT_TIME;
-
-#endif
-                       }
+       if (dev->block_info_alt && dev->block_info)
+               vfree(dev->block_info);
+       else
+               kfree(dev->block_info);
 
-                       retVal = (yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0) >=
-                               0) ? YAFFS_OK : YAFFS_FAIL;
-               }
-       } else {
-               retVal = YAFFS_OK;
-       }
+       dev->block_info_alt = 0;
 
-       return retVal;
+       dev->block_info = NULL;
 
+       if (dev->chunk_bits_alt && dev->chunk_bits)
+               vfree(dev->chunk_bits);
+       else
+               kfree(dev->chunk_bits);
+       dev->chunk_bits_alt = 0;
+       dev->chunk_bits = NULL;
 }
 
-static int yaffs_DoGenericObjectDeletion(yaffs_Object *in)
+static int yaffs_init_blocks(struct yaffs_dev *dev)
 {
+       int n_blocks = dev->internal_end_block - dev->internal_start_block + 1;
 
-       /* First off, invalidate the file's data in the cache, without flushing. */
-       yaffs_InvalidateWholeChunkCache(in);
+       dev->block_info = NULL;
+       dev->chunk_bits = NULL;
+       dev->alloc_block = -1;  /* force it to get a new one */
+
+       /* If the first allocation strategy fails, thry the alternate one */
+       dev->block_info =
+               kmalloc(n_blocks * sizeof(struct yaffs_block_info), GFP_NOFS);
+       if (!dev->block_info) {
+               dev->block_info =
+                   vmalloc(n_blocks * sizeof(struct yaffs_block_info));
+               dev->block_info_alt = 1;
+       } else {
+               dev->block_info_alt = 0;
+       }
 
-       if (in->myDev->param.isYaffs2 && (in->parent != in->myDev->deletedDir)) {
-               /* Move to the unlinked directory so we have a record that it was deleted. */
-               yaffs_ChangeObjectName(in, in->myDev->deletedDir, _Y("deleted"), 0, 0);
+       if (!dev->block_info)
+               goto alloc_error;
 
+       /* Set up dynamic blockinfo stuff. Round up bytes. */
+       dev->chunk_bit_stride = (dev->param.chunks_per_block + 7) / 8;
+       dev->chunk_bits =
+               kmalloc(dev->chunk_bit_stride * n_blocks, GFP_NOFS);
+       if (!dev->chunk_bits) {
+               dev->chunk_bits =
+                   vmalloc(dev->chunk_bit_stride * n_blocks);
+               dev->chunk_bits_alt = 1;
+       } else {
+               dev->chunk_bits_alt = 0;
        }
+       if (!dev->chunk_bits)
+               goto alloc_error;
 
-       yaffs_RemoveObjectFromDirectory(in);
-       yaffs_DeleteChunk(in->myDev, in->hdrChunk, 1, __LINE__);
-       in->hdrChunk = 0;
 
-       yaffs_FreeObject(in);
+       memset(dev->block_info, 0, n_blocks * sizeof(struct yaffs_block_info));
+       memset(dev->chunk_bits, 0, dev->chunk_bit_stride * n_blocks);
        return YAFFS_OK;
 
+alloc_error:
+       yaffs_deinit_blocks(dev);
+       return YAFFS_FAIL;
 }
 
-/* yaffs_DeleteFile deletes the whole file data
- * and the inode associated with the file.
- * It does not delete the links associated with the file.
- */
-static int yaffs_UnlinkFileIfNeeded(yaffs_Object *in)
-{
-
-       int retVal;
-       int immediateDeletion = 0;
 
-       if (!in->myInode)
-               immediateDeletion = 1;
+void yaffs_block_became_dirty(struct yaffs_dev *dev, int block_no)
+{
+       struct yaffs_block_info *bi = yaffs_get_block_info(dev, block_no);
+       int erased_ok = 0;
+       int i;
 
-       if (immediateDeletion) {
-               retVal =
-                   yaffs_ChangeObjectName(in, in->myDev->deletedDir,
-                                          _Y("deleted"), 0, 0);
-               T(YAFFS_TRACE_TRACING,
-                 (TSTR("yaffs: immediate deletion of file %d" TENDSTR),
-                  in->objectId));
-               in->deleted = 1;
-               in->myDev->nDeletedFiles++;
-               if (1 || in->myDev->param.isYaffs2)
-                       yaffs_ResizeFile(in, 0);
-               yaffs_SoftDeleteFile(in);
-       } else {
-               retVal =
-                   yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,
-                                          _Y("unlinked"), 0, 0);
-       }
+       /* If the block is still healthy erase it and mark as clean.
+        * If the block has had a data failure, then retire it.
+        */
 
+       yaffs_trace(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
+               "yaffs_block_became_dirty block %d state %d %s",
+               block_no, bi->block_state,
+               (bi->needs_retiring) ? "needs retiring" : "");
 
-       return retVal;
-}
+       yaffs2_clear_oldest_dirty_seq(dev, bi);
 
-int yaffs_DeleteFile(yaffs_Object *in)
-{
-       int retVal = YAFFS_OK;
-       int deleted = in->deleted;
+       bi->block_state = YAFFS_BLOCK_STATE_DIRTY;
 
-       yaffs_ResizeFile(in, 0);
+       /* If this is the block being garbage collected then stop gc'ing */
+       if (block_no == dev->gc_block)
+               dev->gc_block = 0;
 
-       if (in->nDataChunks > 0) {
-               /* Use soft deletion if there is data in the file.
-                * That won't be the case if it has been resized to zero.
-                */
-               if (!in->unlinked)
-                       retVal = yaffs_UnlinkFileIfNeeded(in);
+       /* If this block is currently the best candidate for gc
+        * then drop as a candidate */
+       if (block_no == dev->gc_dirtiest) {
+               dev->gc_dirtiest = 0;
+               dev->gc_pages_in_use = 0;
+       }
 
-               if (retVal == YAFFS_OK && in->unlinked && !in->deleted) {
-                       in->deleted = 1;
-                       deleted = 1;
-                       in->myDev->nDeletedFiles++;
-                       yaffs_SoftDeleteFile(in);
+       if (!bi->needs_retiring) {
+               yaffs2_checkpt_invalidate(dev);
+               erased_ok = yaffs_erase_block(dev, block_no);
+               if (!erased_ok) {
+                       dev->n_erase_failures++;
+                       yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
+                         "**>> Erasure failed %d", block_no);
                }
-               return deleted ? YAFFS_OK : YAFFS_FAIL;
-       } else {
-               /* The file has no data chunks so we toss it immediately */
-               yaffs_FreeTnode(in->myDev, in->variant.fileVariant.top);
-               in->variant.fileVariant.top = NULL;
-               yaffs_DoGenericObjectDeletion(in);
+       }
 
-               return YAFFS_OK;
+       /* Verify erasure if needed */
+       if (erased_ok &&
+           ((yaffs_trace_mask & YAFFS_TRACE_ERASE) ||
+            !yaffs_skip_verification(dev))) {
+               for (i = 0; i < dev->param.chunks_per_block; i++) {
+                       if (!yaffs_check_chunk_erased(dev,
+                               block_no * dev->param.chunks_per_block + i)) {
+                               yaffs_trace(YAFFS_TRACE_ERROR,
+                                       ">>Block %d erasure supposedly OK, but chunk %d not erased",
+                                       block_no, i);
+                       }
+               }
        }
-}
 
-static int yaffs_IsNonEmptyDirectory(yaffs_Object *obj)
-{
-       return (obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) &&
-               !(ylist_empty(&obj->variant.directoryVariant.children));
-}
+       if (!erased_ok) {
+               /* We lost a block of free space */
+               dev->n_free_chunks -= dev->param.chunks_per_block;
+               yaffs_retire_block(dev, block_no);
+               yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
+                       "**>> Block %d retired", block_no);
+               return;
+       }
 
-static int yaffs_DeleteDirectory(yaffs_Object *obj)
-{
-       /* First check that the directory is empty. */
-       if (yaffs_IsNonEmptyDirectory(obj))
-               return YAFFS_FAIL;
+       /* Clean it up... */
+       bi->block_state = YAFFS_BLOCK_STATE_EMPTY;
+       bi->seq_number = 0;
+       dev->n_erased_blocks++;
+       bi->pages_in_use = 0;
+       bi->soft_del_pages = 0;
+       bi->has_shrink_hdr = 0;
+       bi->skip_erased_check = 1;      /* Clean, so no need to check */
+       bi->gc_prioritise = 0;
+       bi->has_summary = 0;
+
+       yaffs_clear_chunk_bits(dev, block_no);
+
+       yaffs_trace(YAFFS_TRACE_ERASE, "Erased block %d", block_no);
+}
+
+static inline int yaffs_gc_process_chunk(struct yaffs_dev *dev,
+                                       struct yaffs_block_info *bi,
+                                       int old_chunk, u8 *buffer)
+{
+       int new_chunk;
+       int mark_flash = 1;
+       struct yaffs_ext_tags tags;
+       struct yaffs_obj *object;
+       int matching_chunk;
+       int ret_val = YAFFS_OK;
+
+       memset(&tags, 0, sizeof(tags));
+       yaffs_rd_chunk_tags_nand(dev, old_chunk,
+                                buffer, &tags);
+       object = yaffs_find_by_number(dev, tags.obj_id);
+
+       yaffs_trace(YAFFS_TRACE_GC_DETAIL,
+               "Collecting chunk in block %d, %d %d %d ",
+               dev->gc_chunk, tags.obj_id,
+               tags.chunk_id, tags.n_bytes);
+
+       if (object && !yaffs_skip_verification(dev)) {
+               if (tags.chunk_id == 0)
+                       matching_chunk =
+                           object->hdr_chunk;
+               else if (object->soft_del)
+                       /* Defeat the test */
+                       matching_chunk = old_chunk;
+               else
+                       matching_chunk =
+                           yaffs_find_chunk_in_file
+                           (object, tags.chunk_id,
+                            NULL);
+
+               if (old_chunk != matching_chunk)
+                       yaffs_trace(YAFFS_TRACE_ERROR,
+                               "gc: page in gc mismatch: %d %d %d %d",
+                               old_chunk,
+                               matching_chunk,
+                               tags.obj_id,
+                               tags.chunk_id);
+       }
+
+       if (!object) {
+               yaffs_trace(YAFFS_TRACE_ERROR,
+                       "page %d in gc has no object: %d %d %d ",
+                       old_chunk,
+                       tags.obj_id, tags.chunk_id,
+                       tags.n_bytes);
+       }
+
+       if (object &&
+           object->deleted &&
+           object->soft_del && tags.chunk_id != 0) {
+               /* Data chunk in a soft deleted file,
+                * throw it away.
+                * It's a soft deleted data chunk,
+                * No need to copy this, just forget
+                * about it and fix up the object.
+                */
 
-       return yaffs_DoGenericObjectDeletion(obj);
-}
+               /* Free chunks already includes
+                * softdeleted chunks, how ever this
+                * chunk is going to soon be really
+                * deleted which will increment free
+                * chunks. We have to decrement free
+                * chunks so this works out properly.
+                */
+               dev->n_free_chunks--;
+               bi->soft_del_pages--;
+
+               object->n_data_chunks--;
+               if (object->n_data_chunks <= 0) {
+                       /* remeber to clean up obj */
+                       dev->gc_cleanup_list[dev->n_clean_ups] = tags.obj_id;
+                       dev->n_clean_ups++;
+               }
+               mark_flash = 0;
+       } else if (object) {
+               /* It's either a data chunk in a live
+                * file or an ObjectHeader, so we're
+                * interested in it.
+                * NB Need to keep the ObjectHeaders of
+                * deleted files until the whole file
+                * has been deleted off
+                */
+               tags.serial_number++;
+               dev->n_gc_copies++;
+
+               if (tags.chunk_id == 0) {
+                       /* It is an object Id,
+                        * We need to nuke the
+                        * shrinkheader flags since its
+                        * work is done.
+                        * Also need to clean up
+                        * shadowing.
+                        */
+                       struct yaffs_obj_hdr *oh;
+                       oh = (struct yaffs_obj_hdr *) buffer;
+
+                       oh->is_shrink = 0;
+                       tags.extra_is_shrink = 0;
+                       oh->shadows_obj = 0;
+                       oh->inband_shadowed_obj_id = 0;
+                       tags.extra_shadows = 0;
+
+                       /* Update file size */
+                       if (object->variant_type == YAFFS_OBJECT_TYPE_FILE) {
+                               yaffs_oh_size_load(oh,
+                                   object->variant.file_variant.file_size);
+                               tags.extra_file_size =
+                                   object->variant.file_variant.file_size;
+                       }
 
-static int yaffs_DeleteSymLink(yaffs_Object *in)
-{
-       if(in->variant.symLinkVariant.alias)
-               YFREE(in->variant.symLinkVariant.alias);
-       in->variant.symLinkVariant.alias=NULL;
+                       yaffs_verify_oh(object, oh, &tags, 1);
+                       new_chunk =
+                           yaffs_write_new_chunk(dev, (u8 *) oh, &tags, 1);
+               } else {
+                       new_chunk =
+                           yaffs_write_new_chunk(dev, buffer, &tags, 1);
+               }
 
-       return yaffs_DoGenericObjectDeletion(in);
-}
+               if (new_chunk < 0) {
+                       ret_val = YAFFS_FAIL;
+               } else {
 
-static int yaffs_DeleteHardLink(yaffs_Object *in)
-{
-       /* remove this hardlink from the list assocaited with the equivalent
-        * object
-        */
-       ylist_del_init(&in->hardLinks);
-       return yaffs_DoGenericObjectDeletion(in);
-}
+                       /* Now fix up the Tnodes etc. */
 
-int yaffs_DeleteObject(yaffs_Object *obj)
-{
-int retVal = -1;
-       switch (obj->variantType) {
-       case YAFFS_OBJECT_TYPE_FILE:
-               retVal = yaffs_DeleteFile(obj);
-               break;
-       case YAFFS_OBJECT_TYPE_DIRECTORY:
-               if(!ylist_empty(&obj->variant.directoryVariant.dirty)){
-                       T(YAFFS_TRACE_BACKGROUND, (TSTR("Remove object %d from dirty directories" TENDSTR),obj->objectId));
-                       ylist_del_init(&obj->variant.directoryVariant.dirty);
+                       if (tags.chunk_id == 0) {
+                               /* It's a header */
+                               object->hdr_chunk = new_chunk;
+                               object->serial = tags.serial_number;
+                       } else {
+                               /* It's a data chunk */
+                               yaffs_put_chunk_in_file(object, tags.chunk_id,
+                                                       new_chunk, 0);
+                       }
                }
-               return yaffs_DeleteDirectory(obj);
-               break;
-       case YAFFS_OBJECT_TYPE_SYMLINK:
-               retVal = yaffs_DeleteSymLink(obj);
-               break;
-       case YAFFS_OBJECT_TYPE_HARDLINK:
-               retVal = yaffs_DeleteHardLink(obj);
-               break;
-       case YAFFS_OBJECT_TYPE_SPECIAL:
-               retVal = yaffs_DoGenericObjectDeletion(obj);
-               break;
-       case YAFFS_OBJECT_TYPE_UNKNOWN:
-               retVal = 0;
-               break;          /* should not happen. */
        }
-
-       return retVal;
+       if (ret_val == YAFFS_OK)
+               yaffs_chunk_del(dev, old_chunk, mark_flash, __LINE__);
+       return ret_val;
 }
 
-static int yaffs_UnlinkWorker(yaffs_Object *obj)
+static int yaffs_gc_block(struct yaffs_dev *dev, int block, int whole_block)
 {
+       int old_chunk;
+       int ret_val = YAFFS_OK;
+       int i;
+       int is_checkpt_block;
+       int max_copies;
+       int chunks_before = yaffs_get_erased_chunks(dev);
+       int chunks_after;
+       struct yaffs_block_info *bi = yaffs_get_block_info(dev, block);
 
-       int immediateDeletion = 0;
-
-       if (!obj->myInode)
-               immediateDeletion = 1;
+       is_checkpt_block = (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT);
 
-       if(obj)
-               yaffs_UpdateParent(obj->parent);
+       yaffs_trace(YAFFS_TRACE_TRACING,
+               "Collecting block %d, in use %d, shrink %d, whole_block %d",
+               block, bi->pages_in_use, bi->has_shrink_hdr,
+               whole_block);
 
-       if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
-               return yaffs_DeleteHardLink(obj);
-       } else if (!ylist_empty(&obj->hardLinks)) {
-               /* Curve ball: We're unlinking an object that has a hardlink.
-                *
-                * This problem arises because we are not strictly following
-                * The Linux link/inode model.
-                *
-                * We can't really delete the object.
-                * Instead, we do the following:
-                * - Select a hardlink.
-                * - Unhook it from the hard links