/*
- * YAFFS: Yet another FFS. A NAND-flash specific file system.
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
*
- * Copyright (C) 2002 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>
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
- *
*/
- //yaffs_guts.c
-
-const char *yaffs_guts_c_version="$Id: yaffs_guts.c,v 1.16 2005-08-09 03:52:23 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"
+#include "yaffs_nand.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"
+
+/* Note YAFFS_GC_GOOD_ENOUGH must be <= YAFFS_GC_PASSIVE_THRESHOLD */
+#define YAFFS_GC_GOOD_ENOUGH 2
+#define YAFFS_GC_PASSIVE_THRESHOLD 4
-#ifdef CONFIG_YAFFS_WINCE
-void yfsd_LockYAFFS(BOOL fsLockOnly);
-void yfsd_UnlockYAFFS(BOOL fsLockOnly);
-#endif
-
-#define YAFFS_PASSIVE_GC_CHUNKS 2
-
-#if 0
-// Use Steven Hill's ECC struff instead
-// External functions for ECC on data
-void nand_calculate_ecc (const u_char *dat, u_char *ecc_code);
-int nand_correct_data (u_char *dat, u_char *read_ecc, u_char *calc_ecc);
-#define yaffs_ECCCalculate(data,ecc) nand_calculate_ecc(data,ecc)
-#define yaffs_ECCCorrect(data,read_ecc,calc_ecc) nand_correct_ecc(data,read_ecc,calc_ecc)
-#else
#include "yaffs_ecc.h"
-#endif
-
-#if 0
-// countBits is a quick way of counting the number of bits in a byte.
-// ie. countBits[n] holds the number of 1 bits in a byte with the value n.
-
-static const char yaffs_countBitsTable[256] =
-{
-0,1,1,2,1,2,2,3,1,2,2,3,2,3,3,4,
-1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,
-1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,
-2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
-1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,
-2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
-2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
-3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
-1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,
-2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
-2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
-3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
-2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
-3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
-3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
-4,5,5,6,5,6,6,7,5,6,6,7,6,7,7,8
-};
-
-static int yaffs_CountBits(__u8 x)
-{
- int retVal;
- retVal = yaffs_countBitsTable[x];
- return retVal;
-}
-
-#endif
-
-#if 0
-// Stuff using yea olde tags
-static void yaffs_LoadTagsIntoSpare(yaffs_Spare *sparePtr, yaffs_Tags *tagsPtr);
-static void yaffs_GetTagsFromSpare(yaffs_Device *dev, yaffs_Spare *sparePtr,yaffs_Tags *tagsPtr);
+/* Forward declarations */
-static int yaffs_ReadChunkTagsFromNAND(yaffs_Device *dev,int chunkInNAND, yaffs_Tags *tags, int *chunkDeleted);
-static int yaffs_TagsMatch(const yaffs_Tags *tags, int objectId, int chunkInObject, int chunkDeleted);
-#else
-#endif
+static int yaffs_wr_data_obj(struct yaffs_obj *in, int inode_chunk,
+ const u8 *buffer, int n_bytes, int use_reserve);
-// NAND access
-static Y_INLINE int yaffs_ReadChunkWithTagsFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *buffer, yaffs_ExtendedTags *tags);
-static Y_INLINE int yaffs_WriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND, const __u8 *data, yaffs_ExtendedTags *tags);
-static Y_INLINE int yaffs_MarkBlockBad(yaffs_Device *dev, int blockNo);
-static Y_INLINE int yaffs_QueryInitialBlockState(yaffs_Device *dev,int blockNo, yaffs_BlockState *state,unsigned *sequenceNumber);
-// Local prototypes
-static int yaffs_WriteNewChunkWithTagsToNAND(yaffs_Device *dev, const __u8 *buffer, yaffs_ExtendedTags *tags, int useReserve);
-#if 0
-static int yaffs_CheckObjectHashSanity(yaffs_Device *dev);
-#endif
-static int yaffs_PutChunkIntoFile(yaffs_Object *in,int chunkInInode, int chunkInNAND, int inScan);
+/* Function to calculate chunk and offset */
-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);
+void yaffs_addr_to_chunk(struct yaffs_dev *dev, loff_t addr,
+ int *chunk_out, u32 *offset_out)
+{
+ int chunk;
+ u32 offset;
-static yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device *dev,int blockNo);
+ chunk = (u32) (addr >> dev->chunk_shift);
-static __u8 *yaffs_GetTempBuffer(yaffs_Device *dev,int lineNo);
-static void yaffs_ReleaseTempBuffer(yaffs_Device *dev, __u8 *buffer, int lineNo);
+ if (dev->chunk_div == 1) {
+ /* easy power of 2 case */
+ offset = (u32) (addr & dev->chunk_mask);
+ } else {
+ /* Non power-of-2 case */
+ loff_t chunk_base;
-// Robustification (if it ever comes about...)
-static void yaffs_RetireBlock(yaffs_Device *dev,int blockInNAND);
-#if 0
-static void yaffs_HandleReadDataError(yaffs_Device *dev,int chunkInNAND);
-#endif
-static void yaffs_HandleWriteChunkError(yaffs_Device *dev,int chunkInNAND);
-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);
+ chunk /= dev->chunk_div;
-static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,int chunkInNAND);
+ chunk_base = ((loff_t) chunk) * dev->data_bytes_per_chunk;
+ offset = (u32) (addr - chunk_base);
+ }
-static int yaffs_UnlinkWorker(yaffs_Object *obj);
-static void yaffs_DestroyObject(yaffs_Object *obj);
+ *chunk_out = chunk;
+ *offset_out = offset;
+}
-#if 0
-static int yaffs_VerifyCompare(const __u8 *d0, const __u8 * d1, const yaffs_Spare *s0, const yaffs_Spare *s1,int dataSize);
-#endif
+/* Function to return the number of shifts for a power of 2 greater than or
+ * equal to the given number
+ * Note we don't try to cater for all possible numbers and this does not have to
+ * be hellishly efficient.
+ */
-static int yaffs_TagsMatch(const yaffs_ExtendedTags *tags, int objectId, int chunkInObject);
+static inline u32 calc_shifts_ceiling(u32 x)
+{
+ int extra_bits;
+ int shifts;
+ shifts = extra_bits = 0;
-loff_t yaffs_GetFileSize(yaffs_Object *obj);
+ while (x > 1) {
+ if (x & 1)
+ extra_bits++;
+ x >>= 1;
+ shifts++;
+ }
+ if (extra_bits)
+ shifts++;
-static int yaffs_AllocateChunk(yaffs_Device *dev,int useReserve);
+ return shifts;
+}
-static void yaffs_VerifyFreeChunks(yaffs_Device *dev);
+/* Function to return the number of shifts to get a 1 in bit 0
+ */
-#ifdef YAFFS_PARANOID
-static int yaffs_CheckFileSanity(yaffs_Object *in);
-#else
-#define yaffs_CheckFileSanity(in)
-#endif
+static inline u32 calc_shifts(u32 x)
+{
+ u32 shifts;
-static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in);
-static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId);
+ shifts = 0;
-static int yaffs_ReadChunkWithTagsFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *buffer, yaffs_ExtendedTags *tags)
-{
- chunkInNAND -= dev->chunkOffset;
-
- if(dev->readChunkWithTagsFromNAND)
- return dev->readChunkWithTagsFromNAND(dev,chunkInNAND,buffer,tags);
- else
- return yaffs_TagsCompatabilityReadChunkWithTagsFromNAND(dev,chunkInNAND,buffer,tags);
-}
+ if (!x)
+ return 0;
-static Y_INLINE int yaffs_WriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND, const __u8 *buffer, yaffs_ExtendedTags *tags)
-{
- chunkInNAND -= dev->chunkOffset;
-
- if(tags)
- {
- tags->sequenceNumber = dev->sequenceNumber;
- tags->chunkUsed = 1;
- if(!yaffs_ValidateTags(tags))
- {
- T(YAFFS_TRACE_ERROR,(TSTR("Writing uninitialised tags" TENDSTR)));
- YBUG();
- }
- T(YAFFS_TRACE_WRITE,(TSTR("Writing chunk %d tags %d %d"TENDSTR),chunkInNAND,tags->objectId,tags->chunkId));
- }
- else
- {
- T(YAFFS_TRACE_ERROR,(TSTR("Writing with no tags" TENDSTR)));
- YBUG();
+ while (!(x & 1)) {
+ x >>= 1;
+ shifts++;
}
- if(dev->writeChunkWithTagsToNAND)
- return dev->writeChunkWithTagsToNAND(dev,chunkInNAND,buffer,tags);
- else
- return yaffs_TagsCompatabilityWriteChunkWithTagsToNAND(dev,chunkInNAND,buffer,tags);
+ return shifts;
}
-static Y_INLINE int yaffs_MarkBlockBad(yaffs_Device *dev, int blockNo)
-{
- blockNo -= dev->blockOffset;
-
- if(dev->markNANDBlockBad)
- return dev->markNANDBlockBad(dev,blockNo);
- else
- return yaffs_TagsCompatabilityMarkNANDBlockBad(dev,blockNo);
-}
-static Y_INLINE int yaffs_QueryInitialBlockState(yaffs_Device *dev,int blockNo, yaffs_BlockState *state, unsigned *sequenceNumber)
-{
- blockNo -= dev->blockOffset;
-
- if(dev->queryNANDBlock)
- return dev->queryNANDBlock(dev,blockNo,state,sequenceNumber);
- else
- return yaffs_TagsCompatabilityQueryNANDBlock(dev,blockNo,state,sequenceNumber);
-}
+/*
+ * Temporary buffer manipulations.
+ */
-static int yaffs_EraseBlockInNAND(struct yaffs_DeviceStruct *dev,int blockInNAND)
+static int yaffs_init_tmp_buffers(struct yaffs_dev *dev)
{
- int result;
-
- blockInNAND -= dev->blockOffset;
+ int i;
+ u8 *buf = (u8 *) 1;
- dev->nBlockErasures++;
- result = dev->eraseBlockInNAND(dev,blockInNAND);
+ memset(dev->temp_buffer, 0, sizeof(dev->temp_buffer));
- if(!result)result = dev->eraseBlockInNAND(dev,blockInNAND); // If at first we don't succeed, try again *once*.
- return result;
-}
+ for (i = 0; buf && i < YAFFS_N_TEMP_BUFFERS; i++) {
+ dev->temp_buffer[i].in_use = 0;
+ buf = kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS);
+ dev->temp_buffer[i].buffer = buf;
+ }
-static int yaffs_InitialiseNAND(struct yaffs_DeviceStruct *dev)
-{
- return dev->initialiseNAND(dev);
+ return buf ? YAFFS_OK : YAFFS_FAIL;
}
+u8 *yaffs_get_temp_buffer(struct yaffs_dev * dev)
+{
+ int i;
+ dev->temp_in_use++;
+ if (dev->temp_in_use > dev->max_temp)
+ dev->max_temp = dev->temp_in_use;
-
-// Temporary buffer manipulations
-
-static __u8 *yaffs_GetTempBuffer(yaffs_Device *dev,int lineNo)
-{
- int i,j;
- 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;
+ for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
+ 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)));
-
- dev->unmanagedTempAllocations++;
- // Get an unmanaged one
- return YMALLOC(dev->nBytesPerChunk);
-
-
+ 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->unmanaged_buffer_allocs++;
+ return kmalloc(dev->data_bytes_per_chunk, GFP_NOFS);
+
}
-static void yaffs_ReleaseTempBuffer(yaffs_Device *dev, __u8 *buffer, int lineNo)
+void yaffs_release_temp_buffer(struct yaffs_dev *dev, u8 *buffer)
{
int i;
- for(i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
- {
- if(dev->tempBuffer[i].buffer == buffer)
- {
- dev->tempBuffer[i].line = 0;
+
+ dev->temp_in_use--;
+
+ for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
+ 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++;
+
+ if (buffer) {
+ /* assume it is an unmanaged one. */
+ yaffs_trace(YAFFS_TRACE_BUFFERS,
+ "Releasing unmanaged temp buffer");
+ kfree(buffer);
+ dev->unmanaged_buffer_deallocs++;
}
}
+/*
+ * Functions for robustisizing TODO
+ *
+ */
-// Chunk bitmap manipulations
-
-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_ClearChunkBits(yaffs_Device *dev,int blk)
+static void yaffs_handle_chunk_update(struct yaffs_dev *dev, int nand_chunk,
+ const struct yaffs_ext_tags *tags)
{
- __u8 *blkBits = yaffs_BlockBits(dev,blk);
-
- memset(blkBits,0,dev->chunkBitmapStride);
+ dev = dev;
+ nand_chunk = nand_chunk;
+ tags = tags;
}
-static Y_INLINE void yaffs_ClearChunkBit(yaffs_Device *dev,int blk,int chunk)
+void yaffs_handle_chunk_error(struct yaffs_dev *dev,
+ struct yaffs_block_info *bi)
{
- __u8 *blkBits = yaffs_BlockBits(dev,blk);
-
- blkBits[chunk/8] &= ~ (1<<(chunk & 7));
-}
+ if (!bi->gc_prioritise) {
+ bi->gc_prioritise = 1;
+ dev->has_pending_prioritised_gc = 1;
+ bi->chunk_error_strikes++;
-static Y_INLINE void yaffs_SetChunkBit(yaffs_Device *dev,int blk,int chunk)
-{
- __u8 *blkBits = yaffs_BlockBits(dev,blk);
+ if (bi->chunk_error_strikes > 3) {
+ bi->needs_retiring = 1; /* Too many stikes, so retire */
+ yaffs_trace(YAFFS_TRACE_ALWAYS,
+ "yaffs: Block struck out");
- blkBits[chunk/8] |= (1<<(chunk & 7));
+ }
+ }
}
-static Y_INLINE int yaffs_CheckChunkBit(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);
- return (blkBits[chunk/8] & (1<<(chunk & 7))) ? 1 :0;
-}
+ int flash_block = nand_chunk / dev->param.chunks_per_block;
+ struct yaffs_block_info *bi = yaffs_get_block_info(dev, flash_block);
-static Y_INLINE int yaffs_StillSomeChunkBits(yaffs_Device *dev,int blk)
-{
- __u8 *blkBits = yaffs_BlockBits(dev,blk);
- int i;
- for(i = 0; i < dev->chunkBitmapStride; i++)
- {
- if(*blkBits) return 1;
- blkBits++;
+ yaffs_handle_chunk_error(dev, bi);
+
+ 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);
}
- return 0;
+
+ /* Delete the chunk */
+ yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
+ yaffs_skip_rest_of_block(dev);
}
+/*
+ * Verification code
+ */
+
+/*
+ * Simple hash function. Needs to have a reasonable spread
+ */
-static Y_INLINE int yaffs_HashFunction(int n)
+static inline int yaffs_hash_fn(int n)
{
- return (n % YAFFS_NOBJECT_BUCKETS);
+ if (n < 0)
+ n = -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)
+struct yaffs_obj *yaffs_root(struct yaffs_dev *dev)
{
- return dev->rootDir;
+ return dev->root_dir;
}
-yaffs_Object *yaffs_LostNFound(yaffs_Device *dev)
+struct yaffs_obj *yaffs_lost_n_found(struct yaffs_dev *dev)
{
- return dev->lostNFoundDir;
+ return dev->lost_n_found;
}
+/*
+ * Erased NAND checking functions
+ */
-
-
-int yaffs_CheckFF(__u8 *buffer,int nBytes)
+int yaffs_check_ff(u8 *buffer, int n_bytes)
{
- //Horrible, slow implementation
- while(nBytes--)
- {
- if(*buffer != 0xFF) return 0;
+ /* Horrible, slow implementation */
+ while (n_bytes--) {
+ if (*buffer != 0xff)
+ return 0;
buffer++;
}
return 1;
}
-static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,int chunkInNAND)
+static int yaffs_check_chunk_erased(struct yaffs_dev *dev, int nand_chunk)
{
-
int retval = YAFFS_OK;
- __u8 *data = yaffs_GetTempBuffer(dev,__LINE__);
- yaffs_ExtendedTags tags;
+ u8 *data = yaffs_get_temp_buffer(dev);
+ struct yaffs_ext_tags tags;
+ int result;
-// NCB dev->readChunkWithTagsFromNAND(dev,chunkInNAND,data,&tags);
- yaffs_ReadChunkWithTagsFromNAND(dev,chunkInNAND,data,&tags);
-
- if(!yaffs_CheckFF(data,dev->nBytesPerChunk) || tags.chunkUsed)
- {
- T(YAFFS_TRACE_NANDACCESS,(TSTR("Chunk %d not erased" TENDSTR),chunkInNAND));
+ 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_ReleaseTempBuffer(dev,data,__LINE__);
-
+ yaffs_release_temp_buffer(dev, data);
+
return retval;
-
+
}
+static int yaffs_verify_chunk_written(struct yaffs_dev *dev,
+ int nand_chunk,
+ const u8 *data,
+ struct yaffs_ext_tags *tags)
+{
+ 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;
-#if 1
-static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev, const __u8 *data, yaffs_ExtendedTags *tags,int useReserve)
-{
- int chunk;
-
- int writeOk = 1;
- int attempts = 0;
-
-
-
- do{
- chunk = yaffs_AllocateChunk(dev,useReserve);
-
- if(chunk >= 0)
- {
-
- // First check this chunk is erased...
-#ifndef CONFIG_YAFFS_DISABLE_CHUNK_ERASED_CHECK
- writeOk = yaffs_CheckChunkErased(dev,chunk);
-#endif
- if(!writeOk)
- {
- T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs chunk %d was not erased" TENDSTR),chunk));
- }
- else
- {
- writeOk = yaffs_WriteChunkWithTagsToNAND(dev,chunk,data,tags);
- }
- attempts++;
-
- if(writeOk)
- {
- // Copy the data into the robustification buffer.
- // NB We do this at the end to prevent duplicates in the case of a write error.
- //Todo
- yaffs_HandleWriteChunkOk(dev,chunk,data,tags);
- }
- else
- {
- yaffs_HandleWriteChunkError(dev,chunk);
- }
- }
-
- } while(chunk >= 0 && ! writeOk);
-
- if(attempts > 1)
- {
- T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs write required %d attempts" TENDSTR),attempts));
- dev->nRetriedWrites+= (attempts - 1);
- }
-
+ yaffs_release_temp_buffer(dev, buffer);
-
- return chunk;
+ return retval;
}
-#endif
-///
-// Functions for robustisizing
-//
-//
-
-static void yaffs_RetireBlock(yaffs_Device *dev,int blockInNAND)
+int yaffs_check_alloc_available(struct yaffs_dev *dev, int n_chunks)
{
-
- yaffs_MarkBlockBad(dev,blockInNAND);
-
- yaffs_GetBlockInfo(dev,blockInNAND)->blockState = YAFFS_BLOCK_STATE_DEAD;
+ int reserved_chunks;
+ int reserved_blocks = dev->param.n_reserved_blocks;
+ int checkpt_blocks;
- dev->nRetiredBlocks++;
-}
+ checkpt_blocks = yaffs_calc_checkpt_blocks_required(dev);
+ reserved_chunks =
+ (reserved_blocks + checkpt_blocks) * dev->param.chunks_per_block;
-#if 0
-static int yaffs_RewriteBufferedBlock(yaffs_Device *dev)
-{
- dev->doingBufferedBlockRewrite = 1;
- //
- // Remove erased chunks
- // Rewrite existing chunks to a new block
- // Set current write block to the new block
-
- dev->doingBufferedBlockRewrite = 0;
-
- return 1;
+ return (dev->n_free_chunks > (reserved_chunks + n_chunks));
}
-
-static void yaffs_HandleReadDataError(yaffs_Device *dev,int chunkInNAND)
+static int yaffs_find_alloc_block(struct yaffs_dev *dev)
{
- int blockInNAND = chunkInNAND/dev->nChunksPerBlock;
+ int i;
+ struct yaffs_block_info *bi;
- // Mark the block for retirement
- yaffs_GetBlockInfo(dev,blockInNAND)->needsRetiring = 1;
- T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,(TSTR("**>>Block %d marked for retirement" TENDSTR),blockInNAND));
+ 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");
+ return -1;
+ }
- //TODO
- // Just do a garbage collection on the affected block then retire the block
- // NB recursion
-}
+ /* Find an empty block. */
+ 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;
+ }
-static void yaffs_CheckWrittenBlock(yaffs_Device *dev,int chunkInNAND)
-{
-}
+ 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;
+ }
+ }
-#endif
+ yaffs_trace(YAFFS_TRACE_ALWAYS,
+ "yaffs tragedy: no more erased blocks, but there should have been %d",
+ dev->n_erased_blocks);
-static void yaffs_HandleWriteChunkOk(yaffs_Device *dev,int chunkInNAND,const __u8 *data, const yaffs_ExtendedTags *tags)
-{
+ return -1;
}
-static void yaffs_HandleUpdateChunk(yaffs_Device *dev,int chunkInNAND, const yaffs_ExtendedTags *tags)
+static int yaffs_alloc_chunk(struct yaffs_dev *dev, int use_reserver,
+ struct yaffs_block_info **block_ptr)
{
-}
+ int ret_val;
+ struct yaffs_block_info *bi;
-static void yaffs_HandleWriteChunkError(yaffs_Device *dev,int chunkInNAND)
-{
- int blockInNAND = chunkInNAND/dev->nChunksPerBlock;
+ if (dev->alloc_block < 0) {
+ /* Get next block to allocate off */
+ dev->alloc_block = yaffs_find_alloc_block(dev);
+ dev->alloc_page = 0;
+ }
- // Mark the block for retirement
- yaffs_GetBlockInfo(dev,blockInNAND)->needsRetiring = 1;
- // Delete the chunk
- yaffs_DeleteChunk(dev,chunkInNAND,1,__LINE__);
-}
+ if (!use_reserver && !yaffs_check_alloc_available(dev, 1)) {
+ /* No space unless we're allowed to use the reserve. */
+ return -1;
+ }
+ if (dev->n_erased_blocks < dev->param.n_reserved_blocks
+ && dev->alloc_page == 0)
+ yaffs_trace(YAFFS_TRACE_ALLOCATE, "Allocating reserve");
+ /* Next page please.... */
+ if (dev->alloc_block >= 0) {
+ bi = yaffs_get_block_info(dev, dev->alloc_block);
-#if 0
-static int yaffs_VerifyCompare(const __u8 *d0, const __u8 * d1, const yaffs_Spare *s0, const yaffs_Spare *s1,int dataSize)
-{
+ 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);
+ dev->alloc_page++;
- if( memcmp(d0,d1,dataSize) != 0 ||
- s0->tagByte0 != s1->tagByte0 ||
- s0->tagByte1 != s1->tagByte1 ||
- s0->tagByte2 != s1->tagByte2 ||
- s0->tagByte3 != s1->tagByte3 ||
- s0->tagByte4 != s1->tagByte4 ||
- s0->tagByte5 != s1->tagByte5 ||
- s0->tagByte6 != s1->tagByte6 ||
- s0->tagByte7 != s1->tagByte7 ||
- s0->ecc1[0] != s1->ecc1[0] ||
- s0->ecc1[1] != s1->ecc1[1] ||
- s0->ecc1[2] != s1->ecc1[2] ||
- s0->ecc2[0] != s1->ecc2[0] ||
- s0->ecc2[1] != s1->ecc2[1] ||
- s0->ecc2[2] != s1->ecc2[2] )
- {
- return 0;
+ 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;
}
-
- return 1;
-}
-#endif
+ if (block_ptr)
+ *block_ptr = bi;
+
+ return ret_val;
+ }
+
+ yaffs_trace(YAFFS_TRACE_ERROR,
+ "!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!");
-///////////////////////// Object management //////////////////
-// List of spare objects
-// The list is hooked together using the first pointer
-// in the object
+ return -1;
+}
-// static yaffs_Object *yaffs_freeObjects = NULL;
+static int yaffs_get_erased_chunks(struct yaffs_dev *dev)
+{
+ int n;
-// static int yaffs_nFreeObjects;
+ n = dev->n_erased_blocks * dev->param.chunks_per_block;
-// static yaffs_ObjectList *yaffs_allocatedObjectList = NULL;
+ if (dev->alloc_block > 0)
+ n += (dev->param.chunks_per_block - dev->alloc_page);
-// static yaffs_ObjectBucket yaffs_objectBucket[YAFFS_NOBJECT_BUCKETS];
+ return n;
+}
-static __u16 yaffs_CalcNameSum(const YCHAR *name)
+/*
+ * yaffs_skip_rest_of_block() skips over the rest of the allocation block
+ * if we don't want to write to it.
+ */
+void yaffs_skip_rest_of_block(struct yaffs_dev *dev)
{
- __u16 sum = 0;
- __u16 i = 1;
-
- YUCHAR *bname = (YUCHAR *)name;
- if(bname)
- {
- while ((*bname) && (i <=YAFFS_MAX_NAME_LENGTH))
- {
+ struct yaffs_block_info *bi;
-#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
- sum += yaffs_toupper(*bname) * i;
-#else
- sum += (*bname) * i;
-#endif
- i++;
- bname++;
+ 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;
}
}
- return sum;
}
-static void yaffs_SetObjectName(yaffs_Object *obj, const YCHAR *name)
+static int yaffs_write_new_chunk(struct yaffs_dev *dev,
+ const u8 *data,
+ struct yaffs_ext_tags *tags, int use_reserver)
{
-#ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
- if(name && yaffs_strlen(name) <= YAFFS_SHORT_NAME_LENGTH)
- {
- yaffs_strcpy(obj->shortName,name);
- }
- else
- {
- obj->shortName[0]=_Y('\0');
- }
-#endif
- obj->sum = yaffs_CalcNameSum(name);
-}
+ int attempts = 0;
+ int write_ok = 0;
+ int chunk;
-#if 0
-void yaffs_CalcECC(const __u8 *data, yaffs_Spare *spare)
-{
- yaffs_ECCCalculate(data , spare->ecc1);
- yaffs_ECCCalculate(&data[256] , spare->ecc2);
-}
-#endif
+ yaffs2_checkpt_invalidate(dev);
+ do {
+ struct yaffs_block_info *bi = 0;
+ int erased_ok = 0;
-///////////////////////// TNODES ///////////////////////
+ chunk = yaffs_alloc_chunk(dev, use_reserver, &bi);
+ if (chunk < 0) {
+ /* no space */
+ break;
+ }
-// List of spare tnodes
-// The list is hooked together using the first pointer
-// in the tnode.
+ /* 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;
+
+ 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 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;
+ }
+ }
-//static yaffs_Tnode *yaffs_freeTnodes = NULL;
+ write_ok = yaffs_wr_chunk_tags_nand(dev, chunk, data, tags);
-// static int yaffs_nFreeTnodes;
+ if (!bi->skip_erased_check)
+ write_ok =
+ yaffs_verify_chunk_written(dev, chunk, data, tags);
-//static yaffs_TnodeList *yaffs_allocatedTnodeList = NULL;
+ 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;
+ }
+ bi->skip_erased_check = 1;
+ /* Copy the data into the robustification buffer */
+ yaffs_handle_chunk_wr_ok(dev, chunk, data, tags);
-// yaffs_CreateTnodes creates a bunch more tnodes and
-// adds them to the tnode free list.
-// Don't use this function directly
+ } while (write_ok != YAFFS_OK &&
+ (yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts));
-static int yaffs_CreateTnodes(yaffs_Device *dev,int nTnodes)
-{
- int i;
- yaffs_Tnode *newTnodes;
- yaffs_TnodeList *tnl;
-
- if(nTnodes < 1) return YAFFS_OK;
-
- // make these things
-
- newTnodes = YMALLOC(nTnodes * sizeof(yaffs_Tnode));
-
- if (!newTnodes)
- {
- T(YAFFS_TRACE_ERROR,(TSTR("yaffs: Could not allocate Tnodes"TENDSTR)));
- return YAFFS_FAIL;
- }
-
- // Hook them into the free list
- 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;
- 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)));
-
- }
- else
- {
- tnl->tnodes = newTnodes;
- tnl->next = dev->allocatedTnodeList;
- dev->allocatedTnodeList = tnl;
+ if (!write_ok)
+ chunk = -1;
+
+ if (attempts > 1) {
+ yaffs_trace(YAFFS_TRACE_ERROR,
+ "**>> yaffs write required %d attempts",
+ attempts);
+ dev->n_retried_writes += (attempts - 1);
}
+ return chunk;
+}
+
+/*
+ * Block retiring for handling a broken block.
+ */
- T(YAFFS_TRACE_ALLOCATE,(TSTR("yaffs: Tnodes added" TENDSTR)));
+static void yaffs_retire_block(struct yaffs_dev *dev, int flash_block)
+{
+ struct yaffs_block_info *bi = yaffs_get_block_info(dev, flash_block);
+ yaffs2_checkpt_invalidate(dev);
- return YAFFS_OK;
-}
+ 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;
-// GetTnode gets us a clean tnode. Tries to make allocate more if we run out
-static yaffs_Tnode *yaffs_GetTnode(yaffs_Device *dev)
-{
- yaffs_Tnode *tn = NULL;
-
- // 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)));
+ 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);
}
-#endif
- dev->freeTnodes = dev->freeTnodes->internal[0];
- dev->nFreeTnodes--;
- // zero out
- memset(tn,0,sizeof(yaffs_Tnode));
}
-
- return tn;
+ bi->block_state = YAFFS_BLOCK_STATE_DEAD;
+ bi->gc_prioritise = 0;
+ bi->needs_retiring = 0;
+
+ dev->n_retired_blocks++;
}
+/*---------------- Name handling functions ------------*/
-// FreeTnode frees up a tnode and puts it back on the free list
-static void yaffs_FreeTnode(yaffs_Device*dev, yaffs_Tnode *tn)
+static u16 yaffs_calc_name_sum(const YCHAR *name)
{
- if(tn)
- {
-#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++;
+ u16 sum = 0;
+ u16 i = 1;
+
+ if (!name)
+ return 0;
+
+ while ((*name) && i < (YAFFS_MAX_NAME_LENGTH / 2)) {
+
+ /* 0x1f mask is case insensitive */
+ sum += ((*name) & 0x1f) * i;
+ i++;
+ name++;
}
+ return sum;
+}
+
+void yaffs_set_obj_name(struct yaffs_obj *obj, const YCHAR * name)
+{
+ 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);
}
+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_DeinitialiseTnodes(yaffs_Device*dev)
+loff_t yaffs_max_file_size(struct yaffs_dev *dev)
{
- // Free the list of allocated tnodes
- yaffs_TnodeList *tmp;
-
- while(dev->allocatedTnodeList)
- {
- tmp = dev->allocatedTnodeList->next;
+ return ((loff_t) YAFFS_MAX_CHUNK_ID) * dev->data_bytes_per_chunk;
+}
+
+/*-------------------- TNODES -------------------
- YFREE(dev->allocatedTnodeList->tnodes);
- YFREE(dev->allocatedTnodeList);
- dev->allocatedTnodeList = tmp;
-
+ * 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)
+{
+ struct yaffs_tnode *tn = yaffs_alloc_raw_tnode(dev);
+
+ if (tn) {
+ memset(tn, 0, dev->tnode_size);
+ dev->n_tnodes++;
}
-
- dev->freeTnodes = NULL;
- dev->nFreeTnodes = 0;
+
+ dev->checkpoint_blocks_required = 0; /* force recalculation */
+
+ return tn;
}
-static void yaffs_InitialiseTnodes(yaffs_Device*dev)
+/* 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)
{
- dev->allocatedTnodeList = NULL;
- dev->freeTnodes = NULL;
- dev->nFreeTnodes = 0;
- dev->nTnodesCreated = 0;
+ 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;
}
-#if 0
-void yaffs_TnodeTest(yaffs_Device *dev)
+static 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;
- int i;
- int j;
- yaffs_Tnode *tn[1000];
-
- YINFO("Testing TNodes");
-
- for(j = 0; j < 50; j++)
- {
- for(i = 0; i < 1000; i++)
- {
- tn[i] = yaffs_GetTnode(dev);
- if(!tn[i])
- {
- YALERT("Getting tnode failed");
- }
- }
- for(i = 0; i < 1000; i+=3)
- {
- yaffs_FreeTnode(dev,tn[i]);
- tn[i] = NULL;
- }
-
+ pos &= YAFFS_TNODES_LEVEL0_MASK;
+ val >>= dev->chunk_grp_bits;
+
+ bit_in_map = pos * dev->tnode_width;
+ word_in_map = bit_in_map / 32;
+ bit_in_word = bit_in_map & (32 - 1);
+
+ mask = dev->tnode_mask << bit_in_word;
+
+ map[word_in_map] &= ~mask;
+ map[word_in_map] |= (mask & (val << bit_in_word));
+
+ 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));
}
}
-#endif
+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;
-////////////////// END OF TNODE MANIPULATION ///////////////////////////
+ pos &= YAFFS_TNODES_LEVEL0_MASK;
-/////////////// 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.
+ bit_in_map = pos * dev->tnode_width;
+ word_in_map = bit_in_map / 32;
+ bit_in_word = bit_in_map & (32 - 1);
+ val = map[word_in_map] >> bit_in_word;
-// FindLevel0Tnode finds the level 0 tnode, if one exists.
-// Used when reading.....
-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;
-
- // Check sane level and chunk Id
- if(level < 0 || level > YAFFS_TNODES_MAX_LEVEL)
- {
-// char str[50];
-// sprintf(str,"Bad level %d",level);
-// YALERT(str);
- return NULL;
+ 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);
}
-
- if(chunkId > YAFFS_MAX_CHUNK_ID)
- {
-// char str[50];
-// sprintf(str,"Bad chunkId %d",chunkId);
-// YALERT(str);
+
+ val &= dev->tnode_mask;
+ val <<= dev->chunk_grp_bits;
+
+ 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 top_level
+ * in the tree. 0 means only the level 0 tnode is in the tree.
+ */
+
+/* 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)
+{
+ struct yaffs_tnode *tn = file_struct->top;
+ u32 i;
+ int required_depth;
+ int level = file_struct->top_level;
+
+ dev = dev;
+
+ /* Check sane level and chunk Id */
+ if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL)
return NULL;
- }
- // First check we're tall enough (ie enough topLevel)
-
- i = chunkId >> (/*dev->chunkGroupBits + */YAFFS_TNODES_LEVEL0_BITS);
- requiredTallness = 0;
- while(i)
- {
- i >>= YAFFS_TNODES_INTERNAL_BITS;
- requiredTallness++;
- }
-
-
- if(requiredTallness > fStruct->topLevel)
- {
- // Not tall enough, so we can't find it, return NULL.
+ if (chunk_id > YAFFS_MAX_CHUNK_ID)
return NULL;
+
+ /* First check we're tall enough (ie enough top_level) */
+
+ i = chunk_id >> YAFFS_TNODES_LEVEL0_BITS;
+ required_depth = 0;
+ while (i) {
+ i >>= YAFFS_TNODES_INTERNAL_BITS;
+ required_depth++;
}
-
-
- // Traverse down to level 0
- while (level > 0 && tn)
- {
- tn = tn->internal[(chunkId >>(/* dev->chunkGroupBits + */ YAFFS_TNODES_LEVEL0_BITS + (level-1) * YAFFS_TNODES_INTERNAL_BITS)) &
- YAFFS_TNODES_INTERNAL_MASK];
+
+ if (required_depth > file_struct->top_level)
+ return NULL; /* Not tall enough, so we can't find it */
+
+ /* 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 tn;
+
+ 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.
-//
-static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device *dev, yaffs_FileStructure *fStruct, __u32 chunkId)
+/* 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.
+ */
+
+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)
{
-
- yaffs_Tnode *tn;
-
- int requiredTallness;
+ int required_depth;
int i;
int l;
-
- __u32 x;
-
-
- //T((TSTR("AddOrFind topLevel=%d, chunk=%d"),fStruct->topLevel,chunkId));
-
- // Check sane level and page Id
- if(fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL)
- {
-// char str[50];
-// sprintf(str,"Bad level %d",fStruct->topLevel);
-// YALERT(str);
+ struct yaffs_tnode *tn;
+ u32 x;
+
+ /* Check sane level and page Id */
+ if (file_struct->top_level < 0 ||
+ file_struct->top_level > YAFFS_TNODES_MAX_LEVEL)
return NULL;
- }
-
- if(chunkId > YAFFS_MAX_CHUNK_ID)
- {
-// char str[50];
-// sprintf(str,"Bad chunkId %d",chunkId);
-// YALERT(str);
+
+ if (chunk_id > YAFFS_MAX_CHUNK_ID)
return NULL;
- }
-
- // First check we're tall enough (ie enough topLevel)
-
- x = chunkId >> (/*dev->chunkGroupBits + */YAFFS_TNODES_LEVEL0_BITS);
- requiredTallness = 0;
- while(x)
- {
+
+ /* First check we're tall enough (ie enough top_level) */
+
+ x = chunk_id >> YAFFS_TNODES_LEVEL0_BITS;
+ required_depth = 0;
+ while (x) {
x >>= YAFFS_TNODES_INTERNAL_BITS;
- requiredTallness++;
- }
-
- //T((TSTR(" required=%d"),requiredTallness));
-
-
- if(requiredTallness > fStruct->topLevel)
- {
- // Not tall enough,gotta make the tree taller
- for(i = fStruct->topLevel; i < requiredTallness; i++)
- {
- //T((TSTR(" add new top")));
-
- tn = yaffs_GetTnode(dev);
-
- if(tn)
- {
- tn->internal[0] = fStruct->top;
- fStruct->top = tn;
- }
- else
- {
- T(YAFFS_TRACE_ERROR,(TSTR("yaffs: no more tnodes" TENDSTR)));
- }
- }
-
- fStruct->topLevel = requiredTallness;
- }
-
-
- // Traverse down to level 0, adding anything we need
-
- l = fStruct->topLevel;
- tn = fStruct->top;
- while (l > 0 && tn)
- {
- x = (chunkId >> (/*dev->chunkGroupBits + */YAFFS_TNODES_LEVEL0_BITS + (l-1) * YAFFS_TNODES_INTERNAL_BITS)) &
- YAFFS_TNODES_INTERNAL_MASK;
-
- //T((TSTR(" [%d:%d]"),l,i));
-
- if(!tn->internal[x])
- {
- //T((TSTR(" added")));
-
- tn->internal[x] = yaffs_GetTnode(dev);
- }
-
- tn = tn->internal[x];
- l--;
-
- }
-
- //TSTR(TENDSTR)));
-
- 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->nChunksPerBlock,theChunk % dev->nChunksPerBlock))
- {
- yaffs_ReadChunkWithTagsFromNAND(dev,theChunk,NULL,tags);
- if(yaffs_TagsMatch(tags,objectId,chunkInInode))
- {
- // found it;
- return theChunk;
-
- }
- }
- theChunk++;
+ required_depth++;
}
- 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.
+ 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++) {
-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;
- }
- }
-
+ tn = yaffs_get_tnode(dev);
+
+ if (tn) {
+ tn->internal[0] = file_struct->top;
+ file_struct->top = tn;
+ file_struct->top_level++;
+ } else {
+ yaffs_trace(YAFFS_TRACE_ERROR,
+ "yaffs: no more tnodes");
+ return NULL;
}
- return (allDone) ? 1 : 0;
}
- else if(level == 0)
- {
- int hitLimit = 0;
-
- for(i = YAFFS_NTNODES_LEVEL0 -1; i >= 0 && !hitLimit; i--)
- {
- if(tn->level0[i])
- {
-
- chunkInInode = (chunkOffset << YAFFS_TNODES_LEVEL0_BITS ) + i;
-
- theChunk = tn->level0[i] << dev->chunkGroupBits;
-
- 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;
- }
- }
-
- }
-
- tn->level0[i] = 0;
- }
-
+ }
+
+ /* Traverse down to level 0, adding anything we need */
+
+ l = file_struct->top_level;
+ tn = file_struct->top;
+
+ if (l > 0) {
+ while (l > 0 && tn) {
+ x = (chunk_id >>
+ (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_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;
+
+ } 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;
+ }
}
- return (i < 0) ? 1 : 0;
-
+ 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);
}
-
}
-
- return 1;
-
-}
+ return tn;
+}
-static void yaffs_SoftDeleteChunk(yaffs_Device *dev, int chunk)
+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;
- yaffs_BlockInfo *theBlock;
-
- T(YAFFS_TRACE_DELETION,(TSTR("soft delete chunk %d" TENDSTR),chunk));
-
- theBlock = yaffs_GetBlockInfo(dev, chunk/dev->nChunksPerBlock);
- if(theBlock)
- {
- theBlock->softDeletions++;
- dev->nFreeChunks++;
- }
}
-// 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)
+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 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--)
- {
- if(tn->level0[i])
- {
- // Note this does not find the real chunk, only the chunk group.
- // We make an assumption that a chunk group is niot larger than a block.
- theChunk = (tn->level0[i] << dev->chunkGroupBits);
-
- yaffs_SoftDeleteChunk(dev,theChunk);
- tn->level0[i] = 0;
- }
-
+ int j;
+
+ 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 (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;
+ }
}
- return 1;
-
}
-
+ the_chunk++;
}
-
- return 1;
-
+ return -1;
}
+static int yaffs_find_chunk_in_file(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;
+ int ret_val = -1;
+ struct yaffs_dev *dev = in->my_dev;
+
+ if (!tags) {
+ /* Passed a NULL, so use our own tags space */
+ tags = &local_tags;
+ }
+
+ tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk);
+ if (!tn)
+ return ret_val;
-static void yaffs_SoftDeleteFile(yaffs_Object *obj)
+ the_chunk = yaffs_get_group_base(dev, tn, inode_chunk);
+
+ ret_val = yaffs_find_chunk_in_group(dev, the_chunk, tags, in->obj_id,
+ inode_chunk);
+ return ret_val;
+}
+
+static int yaffs_find_del_file_chunk(struct yaffs_obj *in, int inode_chunk,
+ struct yaffs_ext_tags *tags)
{
- 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;
- }
+ /* 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;
}
-}
+ tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk);
+ if (!tn)
+ return ret_val;
+ the_chunk = yaffs_get_group_base(dev, tn, inode_chunk);
+ ret_val = yaffs_find_chunk_in_group(dev, the_chunk, tags, in->obj_id,
+ inode_chunk);
-// 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.
+ /* Delete the entry in the filestructure (if found) */
+ if (ret_val != -1)
+ yaffs_load_tnode_0(dev, tn, inode_chunk, 0);
-// yaffs_PruneWorker should only be called by yaffs_PruneFileStructure()
+ return ret_val;
+}
-static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device *dev, yaffs_Tnode *tn, __u32 level, int del0)
+int yaffs_put_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
+ int nand_chunk, int in_scan)
{
- int i;
- int hasData;
-
- if(tn)
- {
- hasData = 0;
-
- for(i = 0; i < YAFFS_NTNODES_INTERNAL; i++)
- {
- if(tn->internal[i] && level > 0)
- {
- tn->internal[i] = yaffs_PruneWorker(dev,tn->internal[i],level - 1, ( i == 0) ? del0 : 1);
- }
-
- if(tn->internal[i])
- {
- hasData++;
- }
- }
-
- if(hasData == 0 && del0)
- {
- // Free and return NULL
-
- yaffs_FreeTnode(dev,tn);
- tn = NULL;
+ /* 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 (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 tn;
-
-}
+ tn = yaffs_add_find_tnode_0(dev,
+ &in->variant.file_variant,
+ inode_chunk, NULL);
+ if (!tn)
+ return YAFFS_FAIL;
-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 (!nand_chunk)
+ /* Dummy insert, bail now */
+ return YAFFS_OK;
+
+ existing_cunk = yaffs_get_group_base(dev, tn, inode_chunk);
+
+ 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 (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.
+ */
+
+ if (in_scan > 0) {
+ /* Only do this for forward scanning */
+ yaffs_rd_chunk_tags_nand(dev,
+ nand_chunk,
+ NULL, &new_tags);
+
+ /* Do a proper find */
+ existing_cunk =
+ yaffs_find_chunk_in_file(in, inode_chunk,
+ &existing_tags);
}
-
- if(!hasData)
- {
- fStruct->top = tn->internal[0];
- fStruct->topLevel--;
- yaffs_FreeTnode(dev,tn);
+
+ if (existing_cunk <= 0) {
+ /*Hoosterman - how did this happen? */
+
+ yaffs_trace(YAFFS_TRACE_ERROR,
+ "yaffs tragedy: existing chunk < 0 in scan"
+ );
+
}
- else
- {
- done = 1;
+
+ /* NB The deleted flags should be false, otherwise
+ * the chunks will not be loaded during a scan
+ */
+
+ if (in_scan > 0) {
+ new_serial = new_tags.serial_number;
+ existing_serial = existing_tags.serial_number;
+ }
+
+ 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;
}
}
+
}
-
- return YAFFS_OK;
-}
+ if (existing_cunk == 0)
+ in->n_data_chunks++;
+ yaffs_load_tnode_0(dev, tn, inode_chunk, nand_chunk);
+ return YAFFS_OK;
+}
+static void yaffs_soft_del_chunk(struct yaffs_dev *dev, int chunk)
+{
+ struct yaffs_block_info *the_block;
+ unsigned block_no;
-/////////////////////// End of File Structure functions. /////////////////
+ yaffs_trace(YAFFS_TRACE_DELETION, "soft delete chunk %d", chunk);
-// 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));
-
- if (!newObjects)
- {
- 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 list_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 = YMALLOC(sizeof(yaffs_ObjectList));
- if(!list)
- {
- T(YAFFS_TRACE_ALLOCATE,(TSTR("Could not add objects to management list" TENDSTR)));
- }
- else
- {
- list->objects = newObjects;
- list->next = dev->allocatedObjectList;
- dev->allocatedObjectList = list;
+ 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);
}
-
-
-
- return YAFFS_OK;
}
+/* 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.
+ */
-// AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out
-static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device *dev)
+static int yaffs_soft_del_worker(struct yaffs_obj *in, struct yaffs_tnode *tn,
+ u32 level, int chunk_offset)
{
- yaffs_Object *tn = NULL;
-
- // 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--;
-
- // Now sweeten it up...
-
- memset(tn,0,sizeof(yaffs_Object));
- tn->myDev = dev;
- tn->chunkId = -1;
- tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
- INIT_LIST_HEAD(&(tn->hardLinks));
- INIT_LIST_HEAD(&(tn->hashLink));
- INIT_LIST_HEAD(&tn->siblings);
-
- // 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);
+ int i;
+ int the_chunk;
+ int all_done = 1;
+ struct yaffs_dev *dev = in->my_dev;
+
+ 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;
}
-
- return tn;
+ /* 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 yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device *dev,int number,__u32 mode)
+static void yaffs_remove_obj_from_dir(struct yaffs_obj *obj)
{
+ struct yaffs_dev *dev = obj->my_dev;
+ struct yaffs_obj *parent;
- yaffs_Object *obj = yaffs_CreateNewObject(dev,number,YAFFS_OBJECT_TYPE_DIRECTORY);
- if(obj)
- {
- obj->fake = 1; // it is fake so it has 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->chunkId = 0; // Not a valid chunk.
- }
-
- return obj;
-
-}
+ yaffs_verify_obj_in_dir(obj);
+ parent = obj->parent;
+ yaffs_verify_dir(parent);
-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(!list_empty(&tn->hashLink))
- {
- list_del_init(&tn->hashLink);
- bucket = yaffs_HashFunction(tn->objectId);
- dev->objectBucket[bucket].count--;
- }
-
-}
+ if (dev && dev->param.remove_obj_fn)
+ dev->param.remove_obj_fn(obj);
+ list_del_init(&obj->siblings);
+ obj->parent = NULL;
-// FreeObject frees up a Object and puts it back on the free list
-static void yaffs_FreeObject(yaffs_Object *tn)
-{
+ yaffs_verify_dir(parent);
+}
- yaffs_Device *dev = tn->myDev;
-
-#ifdef __KERNEL__
- if(tn->myInode)
- {
- // We're still hooked up to a cached inode.
- // Don't delete now, but mark for later deletion
- tn->deferedFree = 1;
+void yaffs_add_obj_to_dir(struct yaffs_obj *directory, struct yaffs_obj *obj)
+{
+ if (!directory) {
+ yaffs_trace(YAFFS_TRACE_ALWAYS,
+ "tragedy: Trying to add an object to a null pointer directory"
+ );
+ BUG();
return;
}
-#endif
-
- yaffs_UnhashObject(tn);
-
- // Link into the free list.
- tn->siblings.next = (struct list_head *)(dev->freeObjects);
- dev->freeObjects = tn;
- dev->nFreeObjects++;
-}
-
-
-
-#ifdef __KERNEL__
+ if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
+ yaffs_trace(YAFFS_TRACE_ALWAYS,
+ "tragedy: Trying to add an object to a non-directory"
+ );
+ BUG();
+ }
-void yaffs_HandleDeferedFree(yaffs_Object *obj)
-{
- if(obj->deferedFree)
- {
- yaffs_FreeObject(obj);
+ if (obj->siblings.prev == NULL) {
+ /* Not initialised */
+ BUG();
}
-}
-#endif
+ yaffs_verify_dir(directory);
+ yaffs_remove_obj_from_dir(obj);
+ /* Now add it */
+ list_add(&obj->siblings, &directory->variant.dir_variant.children);
+ obj->parent = directory;
-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;
+ 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;
}
-
- dev->freeObjects = NULL;
- dev->nFreeObjects = 0;
+
+ yaffs_verify_dir(directory);
+ yaffs_verify_obj_in_dir(obj);
}
-static void yaffs_InitialiseObjects(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)
{
- int i;
-
- dev->allocatedObjectList = NULL;
- dev->freeObjects = NULL;
- dev->nFreeObjects = 0;
-
- for(i = 0; i < YAFFS_NOBJECT_BUCKETS; i++)
- {
- INIT_LIST_HEAD(&dev->objectBucket[i].list);
- dev->objectBucket[i].count = 0;
+ int unlink_op;
+ int del_op;
+ struct yaffs_obj *existing_target;
+
+ if (new_dir == NULL)
+ new_dir = obj->parent; /* use the old directory */
+
+ 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);
+
+ existing_target = yaffs_find_by_name(new_dir, new_name);
+
+ /* 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;
+ yaffs_set_obj_name(obj, new_name);
+ obj->dirty = 1;
+ yaffs_add_obj_to_dir(new_dir, obj);
+ if (unlink_op)
+ obj->unlinked = 1;
+ /* 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 YAFFS_FAIL;
+}
+/*------------------------ 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_FindNiceObjectBucket(yaffs_Device *dev)
+static int yaffs_obj_cache_dirty(struct yaffs_obj *obj)
{
- static int x = 0;
+ struct yaffs_dev *dev = obj->my_dev;
int i;
- int l = 999;
- int lowest = 999999;
+ struct yaffs_cache *cache;
+ int n_caches = obj->my_dev->param.n_caches;
-
- // First let's see if we can find one that's empty.
-
- for(i = 0; i < 10 && lowest > 0; i++)
- {
- x++;
- x %= YAFFS_NOBJECT_BUCKETS;
- if(dev->objectBucket[x].count < lowest)
- {
- lowest = dev->objectBucket[x].count;
- l = x;
- }
-
- }
-
- // If we didn't find an empty list, then try
- // looking a bit further for a short one
-
- for(i = 0; i < 10 && lowest > 3; i++)
- {
- x++;
- x %= YAFFS_NOBJECT_BUCKETS;
- if(dev->objectBucket[x].count < lowest)
- {
- lowest = dev->objectBucket[x].count;
- l = x;
- }
-
+ for (i = 0; i < n_caches; i++) {
+ cache = &dev->cache[i];
+ if (cache->object == obj && cache->dirty)
+ return 1;
}
-
- return l;
+
+ return 0;
}
-static int yaffs_CreateNewObjectNumber(yaffs_Device *dev)
+static void yaffs_flush_file_cache(struct yaffs_obj *obj)
{
- int bucket = yaffs_FindNiceObjectBucket(dev);
-
- // Now find an object value that has not already been taken
- // by scanning the list.
-
- int found = 0;
- struct list_head *i;
-
- __u32 n = (__u32)bucket;
+ struct yaffs_dev *dev = obj->my_dev;
+ int lowest = -99; /* Stop compiler whining. */
+ int i;
+ struct yaffs_cache *cache;
+ int chunk_written = 0;
+ int n_caches = obj->my_dev->param.n_caches;
- //yaffs_CheckObjectHashSanity();
-
- while(!found)
- {
- found = 1;
- n += YAFFS_NOBJECT_BUCKETS;
- if(1 ||dev->objectBucket[bucket].count > 0)
- {
- list_for_each(i,&dev->objectBucket[bucket].list)
- {
- // If there is already one in the list
- if(i && list_entry(i, yaffs_Object,hashLink)->objectId == n)
- {
- found = 0;
+ 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;
}
}
}
- }
-
- //T(("bucket %d count %d inode %d\n",bucket,yaffs_objectBucket[bucket].count,n);
-
- return n;
+
+ 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 void yaffs_HashObject(yaffs_Object *in)
+/*yaffs_flush_whole_cache(dev)
+ *
+ *
+ */
+
+void yaffs_flush_whole_cache(struct yaffs_dev *dev)
{
- int bucket = yaffs_HashFunction(in->objectId);
- yaffs_Device *dev = in->myDev;
-
- if(!list_empty(&in->hashLink))
- {
- //YINFO("!!!");
- }
+ struct yaffs_obj *obj;
+ int n_caches = dev->param.n_caches;
+ int i;
-
- list_add(&in->hashLink,&dev->objectBucket[bucket].list);
- dev->objectBucket[bucket].count++;
+ /* 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);
}
-yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device *dev,__u32 number)
+/* 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)
{
- int bucket = yaffs_HashFunction(number);
- struct list_head *i;
- yaffs_Object *in;
-
- list_for_each(i,&dev->objectBucket[bucket].list)
- {
- // Look if it is in the list
- if(i)
- {
- in = list_entry(i, yaffs_Object,hashLink);
- if(in->objectId == number)
- {
-#ifdef __KERNEL__
- // Don't tell the VFS about this one if it is defered free
- if(in->deferedFree)
- return NULL;
-#endif
-
- return in;
- }
+ 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];
}
}
-
return NULL;
}
-
-
-yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev,int number,yaffs_ObjectType type)
+static struct yaffs_cache *yaffs_grab_chunk_cache(struct yaffs_dev *dev)
{
-
- yaffs_Object *theObject;
+ struct yaffs_cache *cache;
+ struct yaffs_obj *the_obj;
+ int usage;
+ int i;
+ int pushout;
- if(number < 0)
- {
- number = yaffs_CreateNewObjectNumber(dev);
- }
-
- theObject = yaffs_AllocateEmptyObject(dev);
-
- 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];
+ if (dev->param.n_caches < 1)
+ return NULL;
-#else
+ /* Try find a non-dirty one... */
+
+ cache = yaffs_grab_chunk_worker(dev);
+
+ 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.
+ */
+
+ /* 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;
+ }
+ }
- 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 = yaffs_GetTnode(dev);
- break;
- case YAFFS_OBJECT_TYPE_DIRECTORY:
- INIT_LIST_HEAD(&theObject->variant.directoryVariant.children);
- break;
- case YAFFS_OBJECT_TYPE_SYMLINK:
- // No action required
- break;
- case YAFFS_OBJECT_TYPE_HARDLINK:
- // No action required
- break;
- case YAFFS_OBJECT_TYPE_SPECIAL:
- // No action required
- break;
- case YAFFS_OBJECT_TYPE_UNKNOWN:
- // todo this should not happen
- break;
+ if (!cache || cache->dirty) {
+ /* Flush and try again */
+ yaffs_flush_file_cache(the_obj);
+ cache = yaffs_grab_chunk_worker(dev);
}
}
-
- return theObject;
+ return cache;
}
-static yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device *dev, int number,yaffs_ObjectType type)
+/* Find a cached chunk */
+static struct yaffs_cache *yaffs_find_chunk_cache(const struct yaffs_obj *obj,
+ int chunk_id)
{
- yaffs_Object *theObject = NULL;
-
- if(number > 0)
- {
- theObject = yaffs_FindObjectByNumber(dev,number);
- }
-
- if(!theObject)
- {
- theObject = yaffs_CreateNewObject(dev,number,type);
- }
-
- return theObject;
+ struct yaffs_dev *dev = obj->my_dev;
+ int i;
+
+ if (dev->param.n_caches < 1)
+ return NULL;
+ 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];
+ }
+ }
+ return NULL;
}
-static YCHAR *yaffs_CloneString(const YCHAR *str)
+/* 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)
{
- YCHAR *newStr = NULL;
-
- if(str && *str)
- {
- newStr = YMALLOC((yaffs_strlen(str) + 1) * sizeof(YCHAR));
- yaffs_strcpy(newStr,str);
- }
-
- return newStr;
-
-}
-
-//
-// Mknod (create) a new object.
-// equivalentObject only has meaning for a hard link;
-// aliasString only has meaning for a sumlink.
-// 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;
-
- 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;
- }
-
- in = yaffs_CreateNewObject(dev,-1,type);
-
- if(in)
- {
- in->chunkId = -1;
- 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 = yaffs_CloneString(aliasString);
- break;
- case YAFFS_OBJECT_TYPE_HARDLINK:
- in->variant.hardLinkVariant.equivalentObject = equivalentObject;
- in->variant.hardLinkVariant.equivalentObjectId = equivalentObject->objectId;
- list_add(&in->hardLinks,&equivalentObject->hardLinks);
- break;
- case YAFFS_OBJECT_TYPE_FILE: // do nothing
- case YAFFS_OBJECT_TYPE_DIRECTORY: // do nothing
- case YAFFS_OBJECT_TYPE_SPECIAL: // do nothing
- case YAFFS_OBJECT_TYPE_UNKNOWN:
- break;
- }
+ int i;
- if(/*yaffs_GetNumberOfFreeChunks(dev) <= 0 || */
- yaffs_UpdateObjectHeader(in,name,0,0,0) < 0)
- {
- // Could not create the object header, fail the creation
- yaffs_DestroyObject(in);
- in = NULL;
- }
+ if (dev->param.n_caches < 1)
+ return;
+
+ 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;
+ dev->cache_last_use = 0;
}
-
- return in;
-}
+ dev->cache_last_use++;
+ cache->last_use = dev->cache_last_use;
-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);
+ if (is_write)
+ cache->dirty = 1;
}
-yaffs_Object *yaffs_MknodDirectory(yaffs_Object *parent,const YCHAR *name, __u32 mode, __u32 uid, __u32 gid)
+/* 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)
{
- return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY,parent,name,mode,uid,gid,NULL,NULL,0);
-}
+ struct yaffs_cache *cache;
-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);
-}
+ if (object->my_dev->param.n_caches > 0) {
+ cache = yaffs_find_chunk_cache(object, chunk_id);
-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);
+ if (cache)
+ cache->object = NULL;
+ }
}
-// NB yaffs_Link returns the object id of the equivalent object.
-yaffs_Object *yaffs_Link(yaffs_Object *parent, const YCHAR *name, yaffs_Object *equivalentObject)
+/* 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)
{
- // 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;
+ int i;
+ struct yaffs_dev *dev = in->my_dev;
+
+ 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;
+ }
}
-
}
-
-static int yaffs_ChangeObjectName(yaffs_Object *obj, yaffs_Object *newDir, const YCHAR *newName,int force,int shadows)
+static void yaffs_unhash_obj(struct yaffs_obj *obj)
{
- int unlinkOp;
- int deleteOp;
-
- yaffs_Object * existingTarget;
+ int bucket;
+ struct yaffs_dev *dev = obj->my_dev;
- if(newDir == NULL)
- {
- newDir = obj->parent; // use the old directory
- }
-
- if(newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
- {
- T(YAFFS_TRACE_ALWAYS,(TSTR("tragendy: yaffs_ChangeObjectName: newDir is not a directory"TENDSTR)));
- YBUG();
+ /* 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--;
}
+}
- // TODO: Do we need this different handling for YAFFS2 and YAFFS1??
- if(obj->myDev->isYaffs2)
- {
- unlinkOp = (newDir == obj->myDev->unlinkedDir);
+/* 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 (!obj) {
+ BUG();
+ return;
}
- 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.
- // Otherwise 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;
- }
+ 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 (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;
}
-
- return YAFFS_FAIL;
-}
+ yaffs_unhash_obj(obj);
+ yaffs_free_raw_obj(dev, obj);
+ dev->n_obj--;
+ dev->checkpoint_blocks_required = 0; /* force recalculation */
+}
-int yaffs_RenameObject(yaffs_Object *oldDir, const YCHAR *oldName, yaffs_Object *newDir, const YCHAR *newName)
+void yaffs_handle_defered_free(struct yaffs_obj *obj)
{
- yaffs_Object *obj;
- yaffs_Object *existingTarget;
- int force = 0;
-
-#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
-
- 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 &&
- !list_empty(&existingTarget->variant.directoryVariant.children))
- {
- // There is a target that is a non-empty directory, so we have to 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
- yaffs_ChangeObjectName(obj,newDir,newName,force,existingTarget->objectId);
- yaffs_Unlink(newDir,newName);
- }
-
-
- return yaffs_ChangeObjectName(obj,newDir,newName,force,0);
- }
- return YAFFS_FAIL;
+ if (obj->defered_free)
+ yaffs_free_obj(obj);
}
-
-#if 0
-
-static int yaffs_CheckObjectHashSanity(yaffs_Device *dev)
+static int yaffs_generic_obj_del(struct yaffs_obj *in)
{
- // Scan the buckets and check that the lists
- // have as many members as the count says there are
- int bucket;
- int countEm;
- struct list_head *j;
- int ok = YAFFS_OK;
-
- for(bucket = 0; bucket < YAFFS_NOBJECT_BUCKETS; bucket++)
- {
- countEm = 0;
-
- list_for_each(j,&dev->objectBucket[bucket].list)
- {
- countEm++;
- }
-
- if(countEm != dev->objectBucket[bucket].count)
- {
- T(YAFFS_TRACE_ERROR,(TSTR("Inode hash inconsistency" TENDSTR)));
- ok = YAFFS_FAIL;
- }
+ /* Iinvalidate the file's data in the cache, without flushing. */
+ yaffs_invalidate_whole_cache(in);
+
+ 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);
}
- return ok;
+ 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;
+
}
+static void yaffs_soft_del_file(struct yaffs_obj *obj)
+{
+ if (!obj->deleted ||
+ obj->variant_type != YAFFS_OBJECT_TYPE_FILE ||
+ obj->soft_del)
+ return;
+
+ 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;
+ }
+}
+
+/* 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.
+ */
-void yaffs_ObjectTest(yaffs_Device *dev)
+static struct yaffs_tnode *yaffs_prune_worker(struct yaffs_dev *dev,
+ struct yaffs_tnode *tn, u32 level,
+ int del0)
{
- yaffs_Object *in[1000];
- int inNo[1000];
- yaffs_Object *inold[1000];
int i;
- int j;
-
- memset(in,0,1000*sizeof(yaffs_Object *));
- memset(inold,0,1000*sizeof(yaffs_Object *));
-
- yaffs_CheckObjectHashSanity(dev);
-
- for(j = 0; j < 10; j++)
- {
- //T(("%d\n",j));
-
- for(i = 0; i < 1000; i++)
- {
- in[i] = yaffs_CreateNewObject(dev,-1,YAFFS_OBJECT_TYPE_FILE);
- if(!in[i])
- {
- YINFO("No more inodes");
- }
- else
- {
- inNo[i] = in[i]->objectId;
- }
- }
-
- for(i = 0; i < 1000; i++)
- {
- if(yaffs_FindObjectByNumber(dev,inNo[i]) != in[i])
- {
- //T(("Differnce in look up test\n"));
- }
- else
- {
- // T(("Look up ok\n"));
+ int has_data;
+
+ 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);
}
+
+ if (tn->internal[i])
+ has_data++;
}
-
- yaffs_CheckObjectHashSanity(dev);
-
- for(i = 0; i < 1000; i+=3)
- {
- yaffs_FreeObject(in[i]);
- in[i] = NULL;
+ } else {
+ int tnode_size_u32 = dev->tnode_size / sizeof(u32);
+ u32 *map = (u32 *) tn;
+
+ for (i = 0; !has_data && i < tnode_size_u32; i++) {
+ if (map[i])
+ has_data++;
}
-
-
- yaffs_CheckObjectHashSanity(dev);
}
-
-}
-
-#endif
-/////////////////////////// Block Management and Page Allocation ///////////////////
-
-
-static int yaffs_InitialiseBlocks(yaffs_Device *dev,int nBlocks)
-{
- dev->allocationBlock = -1; // force it to get a new one
- //Todo we're assuming the malloc will pass.
- dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
- // Set up dynamic blockinfo stuff.
- dev->chunkBitmapStride = (dev->nChunksPerBlock+7)/8;
- dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks);
- if(dev->blockInfo && dev->chunkBits)
- {
- memset(dev->blockInfo,0,nBlocks * sizeof(yaffs_BlockInfo));
- memset(dev->chunkBits,0,dev->chunkBitmapStride * nBlocks);
- return YAFFS_OK;
+ if (has_data == 0 && del0) {
+ /* Free and return NULL */
+ yaffs_free_tnode(dev, tn);
+ tn = NULL;
}
-
- return YAFFS_FAIL;
-
+ return tn;
}
-static void yaffs_DeinitialiseBlocks(yaffs_Device *dev)
+static int yaffs_prune_tree(struct yaffs_dev *dev,
+ struct yaffs_file_var *file_struct)
{
- YFREE(dev->blockInfo);
- dev->blockInfo = NULL;
- YFREE(dev->chunkBits);
- dev->chunkBits = NULL;
-}
+ int i;
+ int has_data;
+ int done = 0;
+ struct yaffs_tnode *tn;
+ if (file_struct->top_level < 1)
+ return YAFFS_OK;
-static int yaffs_BlockNotDisqualifiedFromGC(yaffs_Device *dev, yaffs_BlockInfo *bi)
-{
- int i;
- __u32 seq;
- yaffs_BlockInfo *b;
-
- if(!dev->isYaffs2) return 1; // disqualification only applies to yaffs2.
-
- if(!bi->hasShrinkHeader) return 1; // can gc
+ file_struct->top =
+ yaffs_prune_worker(dev, file_struct->top, file_struct->top_level, 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)
+ */
- // Find the oldest dirty sequence number if we don't know it and save it
- // so we don't have to keep recomputing it.
- if(!dev->oldestDirtySequence)
- {
- seq = dev->sequenceNumber;
-
- for(i = dev->internalStartBlock; i <= dev->internalEndBlock; i++)
- {
- b = yaffs_GetBlockInfo(dev,i);
- if(b->blockState == YAFFS_BLOCK_STATE_FULL &&
- (b->pagesInUse - b->softDeletions )< dev->nChunksPerBlock &&
- b->sequenceNumber < seq)
- {
- seq = b->sequenceNumber;
- }
- }
- dev->oldestDirtySequence = seq;
- }
+ while (file_struct->top_level && !done) {
+ tn = file_struct->top;
+ has_data = 0;
+ for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
+ if (tn->internal[i])
+ has_data++;
+ }
- // 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);
-
-
- return 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;
}
-// FindDiretiestBlock is used to select the dirtiest block (or close enough)
-// for garbage collection.
-//
+/*-------------------- End of File Structure functions.-------------------*/
+/* 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);
+ if (!obj)
+ return obj;
-static int yaffs_FindBlockForGarbageCollection(yaffs_Device *dev,int aggressive)
-{
+ dev->n_obj++;
- int b = dev->currentDirtyChecker;
-
- int i;
- int iterations;
- int dirtiest = -1;
- int pagesInUse;
- yaffs_BlockInfo *bi;
- static int nonAggressiveSkip = 0;
+ /* Now sweeten it up... */
- // 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.
-
+ memset(obj, 0, sizeof(struct yaffs_obj));
+ obj->being_created = 1;
- nonAggressiveSkip--;
+ 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);
- if(!aggressive &&(nonAggressiveSkip > 0))
- {
- return -1;
+ /* 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);
}
- pagesInUse = (aggressive)? dev->nChunksPerBlock : YAFFS_PASSIVE_GC_CHUNKS + 1;
+ /* 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);
- 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 ; i++)
- {
- b++;
- if ( b < dev->internalStartBlock || b > dev->internalEndBlock)
- {
- b = dev->internalStartBlock;
- }
+ obj->being_created = 0;
- 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" TENDSTR),dirtiest,dev->nChunksPerBlock - pagesInUse));
- }
-
- dev->oldestDirtySequence = 0; // clear this
-
- if(dirtiest > 0)
- {
- nonAggressiveSkip = 4;
- }
+ dev->checkpoint_blocks_required = 0; /* force recalculation */
- return dirtiest;
+ return obj;
}
-
-static void yaffs_BlockBecameDirty(yaffs_Device *dev,int blockNo)
+static int yaffs_find_nice_bucket(struct yaffs_dev *dev)
{
- 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.
- bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
+ int i;
+ int l = 999;
+ int lowest = 999999;
- if(!bi->needsRetiring)
- {
- erasedOk = yaffs_EraseBlockInNAND(dev,blockNo);
- if(!erasedOk)
- {
- dev->nErasureFailures++;
- T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,(TSTR("**>> Erasure failed %d" TENDSTR),blockNo));
+ /* Search for the shortest list or one that
+ * isn't too long.
+ */
+
+ 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(erasedOk && (yaffs_traceMask & YAFFS_TRACE_ERASE))
- {
- int i;
- for(i = 0; i < dev->nChunksPerBlock; i++)
- {
- if(!yaffs_CheckChunkErased(dev,blockNo * dev->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;
- dev->nErasedBlocks++;
- bi->pagesInUse = 0;
- bi->softDeletions = 0;
- bi->hasShrinkHeader=0;
- yaffs_ClearChunkBits(dev,blockNo);
-
- T(YAFFS_TRACE_ERASE,(TSTR("Erased block %d" TENDSTR),blockNo));
- }
- else
- {
- dev->nFreeChunks -= dev->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));
- }
+ return l;
}
-#if 0
-static void yaffs_DumpBlockStats(yaffs_Device *dev)
+static int yaffs_new_obj_id(struct yaffs_dev *dev)
{
- int i,j;
- yaffs_BlockInfo *bi;
-
- for(i= dev->internalStartBlock; i <=dev->internalEndBlock; i++)
- {
- bi = yaffs_GetBlockInfo(dev,i);
- T(YAFFS_TRACE_ALLOCATE,(TSTR("%3d state %d shrink %d inuse %d/%d seq %d pages"),i,
- bi->blockState,bi->hasShrinkHeader,bi->pagesInUse,bi->softDeletions,bi->sequenceNumber));
-
- for(j = 0; j < dev->nChunksPerBlock; j++)
- {
- if(yaffs_CheckChunkBit(dev,i,j))
- {
- T(YAFFS_TRACE_ALLOCATE,(TSTR(" %d"),j));
+ int bucket = yaffs_find_nice_bucket(dev);
+ int found = 0;
+ struct list_head *i;
+ u32 n = (u32) bucket;
+
+ /* Now find an object value that has not already been taken
+ * by scanning the list.
+ */
+ 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;
+ }
}
}
- T(YAFFS_TRACE_ALLOCATE,(TSTR(" " TENDSTR)));
-
}
+ return n;
}
-#endif
-
-static int yaffs_FindBlockForAllocation(yaffs_Device *dev)
+static void yaffs_hash_obj(struct yaffs_obj *in)
{
- int i;
-
- yaffs_BlockInfo *bi;
-
-#if 0
- static int j = 0;
- j++;
- if(j < 0 || j > 100)
- {
- j = 0;
- yaffs_DumpBlockStats(dev);
- }
-
-#endif
-
- 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 eraased blocks" TENDSTR)));
+ int bucket = yaffs_hash_fn(in->obj_id);
+ struct yaffs_dev *dev = in->my_dev;
- 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;
+ list_add(&in->hash_link, &dev->obj_bucket[bucket].list);
+ dev->obj_bucket[bucket].count++;
+}
+
+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;
+
+ 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;
}
}
-
-
- T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs tragedy: no more eraased blocks, but there should have been %d" TENDSTR),dev->nErasedBlocks));
-
-
-
-
- return -1;
+ return NULL;
}
-
-// To determine if we have enough space we just look at the
-// number of erased blocks.
-
-static int yaffs_CheckSpaceForAllocation(yaffs_Device *dev)
+static struct yaffs_obj *yaffs_new_obj(struct yaffs_dev *dev, int number,
+ enum yaffs_obj_type type)
{
- int reservedChunks = (dev->nReservedBlocks * dev->nChunksPerBlock);
- return (dev->nFreeChunks > reservedChunks);
-}
+ struct yaffs_obj *the_obj = NULL;
+ struct yaffs_tnode *tn = NULL;
+ if (number < 0)
+ number = yaffs_new_obj_id(dev);
-static int yaffs_AllocateChunk(yaffs_Device *dev,int useReserve)
-{
- 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))
- {
- // Not enough space to allocate unless we're allowed to use the reserve.
- return -1;
+ if (type == YAFFS_OBJECT_TYPE_FILE) {
+ tn = yaffs_get_tnode(dev);
+ if (!tn)
+ return NULL;
}
- if(dev->nErasedBlocks < dev->nReservedBlocks && dev->allocationPage == 0)
- {
- T(YAFFS_TRACE_ALLOCATE,(TSTR("Allocating reserve" TENDSTR)));
+ the_obj = yaffs_alloc_empty_obj(dev);
+ if (!the_obj) {
+ if (tn)
+ yaffs_free_tnode(dev, tn);
+ return NULL;
}
-
- // Next page please....
- if(dev->allocationBlock >= 0)
- {
- bi = yaffs_GetBlockInfo(dev,dev->allocationBlock);
-
- retVal = (dev->allocationBlock * dev->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->nChunksPerBlock)
- {
- bi->blockState = YAFFS_BLOCK_STATE_FULL;
- dev->allocationBlock = -1;
- }
-
+ 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);
+
+ 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;
+}
+
+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;
- return retVal;
-
- }
- T(YAFFS_TRACE_ERROR,(TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
+ 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;
- return -1;
}
+static void yaffs_init_tnodes_and_objs(struct yaffs_dev *dev)
+{
+ int i;
+ 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;
+ }
+}
-static int yaffs_GetErasedChunks(yaffs_Device *dev)
+struct yaffs_obj *yaffs_find_or_create_by_number(struct yaffs_dev *dev,
+ int number,
+ enum yaffs_obj_type type)
{
- int n;
+ struct yaffs_obj *the_obj = NULL;
- n = dev->nErasedBlocks * dev->nChunksPerBlock;
+ if (number > 0)
+ the_obj = yaffs_find_by_number(dev, number);
- if(dev->allocationBlock> 0)
- {
- n += (dev->nChunksPerBlock - dev->allocationPage);
- }
+ if (!the_obj)
+ the_obj = yaffs_new_obj(dev, number, type);
- return n;
+ return the_obj;
}
-static int yaffs_GarbageCollectBlock(yaffs_Device *dev,int block)
+YCHAR *yaffs_clone_str(const YCHAR *str)
{
- int oldChunk;
- int newChunk;
- int chunkInBlock;
- int markNAND;
- int retVal = YAFFS_OK;
- int cleanups = 0;
- int i;
+ YCHAR *new_str = NULL;
+ int len;
- int chunksBefore = yaffs_GetErasedChunks(dev);
- int chunksAfter;
+ if (!str)
+ str = _Y("");
- yaffs_ExtendedTags tags;
-
- yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,block);
-
- yaffs_Object *object;
-
- bi->blockState = YAFFS_BLOCK_STATE_COLLECTING;
+ 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;
- T(YAFFS_TRACE_TRACING,(TSTR("Collecting block %d, in use %d, shrink %d, " TENDSTR),block,bi->pagesInUse,bi->hasShrinkHeader));
- //T(("Collecting block %d n %d bits %x\n",block, bi->pagesInUse, bi->pageBits));
-
- //yaffs_VerifyFreeChunks(dev);
+}
+/*
+ *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.
+ */
- bi->hasShrinkHeader = 0; // clear the flag so that the block can erase
-
- dev->nFreeChunks -= bi->softDeletions; // Take off the number of soft deleted entries because
- // they're going to get really deleted during GC.
+static void yaffs_update_parent(struct yaffs_obj *obj)
+{
+ struct yaffs_dev *dev;
- dev->isDoingGC = 1;
+ 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);
+ }
- if(!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 {
+ yaffs_update_oh(obj, NULL, 0, 0, 0, NULL);
}
- else
- {
+}
- __u8 *buffer = yaffs_GetTempBuffer(dev,__LINE__);
+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;
- for(chunkInBlock = 0,oldChunk = block * dev->nChunksPerBlock;
- chunkInBlock < dev->nChunksPerBlock && yaffs_StillSomeChunkBits(dev,block);
- chunkInBlock++, oldChunk++ )
- {
- if(yaffs_CheckChunkBit(dev,block,chunkInBlock))
- {
-
- // This page is in use and might need to be copied off
-
- markNAND = 1;
-
- //T(("copying page %x from %d to %d\n",mask,oldChunk,newChunk));
-
- yaffs_InitialiseTags(&tags);
-
- yaffs_ReadChunkWithTagsFromNAND(dev,oldChunk,buffer, &tags);
-
- object = yaffs_FindObjectByNumber(dev,tags.objectId);
-
- T(YAFFS_TRACE_GC_DETAIL,(TSTR("Collecting page %d, %d %d %d " TENDSTR),chunkInBlock,tags.objectId,tags.chunkId,tags.byteCount));
-
- if(!object)
- {
- T(YAFFS_TRACE_ERROR,(TSTR("page %d in gc has no object " TENDSTR),oldChunk));
- }
-
- if(object && object->deleted && tags.chunkId != 0)
- {
- // Data chunk in a 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.
-
- //yaffs_PutChunkIntoFile(object, tags.chunkId, 0,0);
- 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->chunkId = 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
- // We no longer want the shrinkHeader flag since its work is done
- // and if it is left in place it will mess up scanning.
- // Also, clear out any shadowing stuff
-
- yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *)buffer;
- oh->isShrink = 0;
- oh->shadowsObject = -1;
- tags.extraShadows = 0;
- tags.extraIsShrinkHeader = 0;
- }
+ yaffs_trace(YAFFS_TRACE_BACKGROUND, "Update dirty directories");
- 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->chunkId = newChunk;
- object->serial = tags.serialNumber;
- }
- else
- {
- // It's a data chunk
- yaffs_PutChunkIntoFile(object, tags.chunkId, newChunk,0);
- }
- }
- }
-
- yaffs_DeleteChunk(dev,oldChunk,markNAND,__LINE__);
-
- }
- }
+ while (!list_empty(&dev->dirty_dirs)) {
+ link = dev->dirty_dirs.next;
+ list_del_init(link);
- yaffs_ReleaseTempBuffer(dev,buffer,__LINE__);
+ 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);
- //yaffs_VerifyFreeChunks(dev);
+ yaffs_trace(YAFFS_TRACE_BACKGROUND, "Update directory %d",
+ obj->obj_id);
- // 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);
- }
+ 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 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)
+{
+ struct yaffs_obj *in;
+ YCHAR *str = NULL;
+ struct yaffs_dev *dev = parent->my_dev;
+
+ /* 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;
+
+ if (type == YAFFS_OBJECT_TYPE_SYMLINK) {
+ str = yaffs_clone_str(alias_str);
+ if (!str)
+ return NULL;
}
+ in = yaffs_new_obj(dev, -1, type);
+
+ if (!in) {
+ kfree(str);
+ return NULL;
}
- if(chunksBefore >= (chunksAfter = yaffs_GetErasedChunks(dev)))
- {
- T(YAFFS_TRACE_GC,(TSTR("gc did not increase free chunks before %d after %d" TENDSTR),chunksBefore,chunksAfter));
- }
-
-
- dev->isDoingGC = 0;
-
- //yaffs_VerifyFreeChunks(dev);
-
- return YAFFS_OK;
-}
+ in->hdr_chunk = 0;
+ in->valid = 1;
+ in->variant_type = type;
-#if 0
-static yaffs_Object *yaffs_FindDeletedUnlinkedFile(yaffs_Device *dev)
-{
- // find a file to delete
- struct list_head *i;
- yaffs_Object *l;
+ in->yst_mode = mode;
+ yaffs_attribs_init(in, gid, uid, rdev);
- //Scan the unlinked files looking for one to delete
- list_for_each(i,&dev->unlinkedDir->variant.directoryVariant.children)
- {
- if(i)
- {
- l = list_entry(i, yaffs_Object,siblings);
- if(l->deleted)
- {
- return l;
- }
- }
- }
- return NULL;
-}
+ in->n_data_chunks = 0;
+ yaffs_set_obj_name(in, name);
+ in->dirty = 1;
-static void yaffs_DoUnlinkedFileDeletion(yaffs_Device *dev)
-{
- // This does background deletion on unlinked files.. only deleted ones.
- // If we don't have a file we're working on then find one
- if(!dev->unlinkedDeletion && dev->nDeletedFiles > 0)
- {
- dev->unlinkedDeletion = yaffs_FindDeletedUnlinkedFile(dev);
- }
-
- // OK, we're working on a file...
- if(dev->unlinkedDeletion)
- {
- yaffs_Object *obj = dev->unlinkedDeletion;
- int delresult;
- int limit; // Number of chunks to delete in a file.
- // NB this can be exceeded, but not by much.
-
- limit = -1;
-
- delresult = yaffs_DeleteWorker(obj, obj->variant.fileVariant.top, obj->variant.fileVariant.topLevel, 0,&limit);
-
- if(obj->nDataChunks == 0)
- {
- // Done all the deleting of data chunks.
- // Now dump the header and clean up
- yaffs_FreeTnode(dev,obj->variant.fileVariant.top);
- obj->variant.fileVariant.top = NULL;
- yaffs_DoGenericObjectDeletion(obj);
- dev->nDeletedFiles--;
- dev->nUnlinkedFiles--;
- dev->nBackgroundDeletions++;
- dev->unlinkedDeletion = NULL;
- }
- }
-}
+ yaffs_add_obj_to_dir(parent, in);
-#endif
+ in->my_dev = parent->my_dev;
+ 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 (yaffs_update_oh(in, name, 0, 0, 0, NULL) < 0) {
+ /* Could not create the object header, fail */
+ yaffs_del_obj(in);
+ in = NULL;
+ }
-// 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 dirtier blocks.
-// Passive gc only inspects smaller areas and will only accept cleaner 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;
-
- //yaffs_VerifyFreeChunks(dev);
-
- if(dev->isDoingGC)
- {
- // Bail out so we don't get recursive gc
- return YAFFS_OK;
- }
+ if (in)
+ yaffs_update_parent(parent);
- // This loop should pass the first time.
- // We'll only see looping here if the erase of the collected block fails.
-
- do{
- maxTries++;
- if(dev->nErasedBlocks < dev->nReservedBlocks)
- {
- // We need a block soon...
- aggressive = 1;
- }
- else
- {
- // We're in no hurry
- aggressive = 0;
- }
-
- block = yaffs_FindBlockForGarbageCollection(dev,aggressive);
-
- if(block > 0)
- {
- dev->garbageCollections++;
- if(!aggressive)
- {
- dev->passiveGarbageCollections++;
- }
+ return in;
+}
- T(YAFFS_TRACE_GC,(TSTR("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),dev->nErasedBlocks,aggressive));
+struct yaffs_obj *yaffs_create_file(struct yaffs_obj *parent,
+ const YCHAR *name, u32 mode, u32 uid,
+ u32 gid)
+{
+ return yaffs_create_obj(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
+ uid, gid, NULL, NULL, 0);
+}
- gcOk = yaffs_GarbageCollectBlock(dev,block);
- }
+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);
+}
- if(dev->nErasedBlocks < (dev->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->nReservedBlocks) && (block > 0) && (maxTries < 2));
+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);
+}
- return aggressive ? gcOk: YAFFS_OK;
+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);
}
+/* 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);
-//////////////////////////// TAGS ///////////////////////////////////////
+ if (yaffs_create_obj(YAFFS_OBJECT_TYPE_HARDLINK,
+ parent, name, 0, 0, 0,
+ equiv_obj, NULL, 0))
+ return equiv_obj;
+ return NULL;
+}
-#if 0
-void yaffs_CalcTagsECC(yaffs_Tags *tags)
-{
- // Calculate an ecc
-
- unsigned char *b = ((yaffs_TagsUnion *)tags)->asBytes;
- unsigned i,j;
- unsigned ecc = 0;
- unsigned bit = 0;
- tags->ecc = 0;
-
- for(i = 0; i < 8; i++)
- {
- for(j = 1; j &0xff; j<<=1)
- {
- bit++;
- if(b[i] & j)
- {
- ecc ^= bit;
- }
- }
- }
-
- tags->ecc = ecc;
-
-
-}
+/*---------------------- Block Management and Page Allocation -------------*/
-int yaffs_CheckECCOnTags(yaffs_Tags *tags)
+static void yaffs_deinit_blocks(struct yaffs_dev *dev)
{
- unsigned ecc = tags->ecc;
-
- yaffs_CalcTagsECC(tags);
-
- ecc ^= tags->ecc;
-
- if(ecc && ecc <= 64)
- {
- // TODO: Handle the failure better. Retire?
- unsigned char *b = ((yaffs_TagsUnion *)tags)->asBytes;
-
- ecc--;
-
- b[ecc / 8] ^= (1 << (ecc & 7));
-
- // Now recvalc the ecc
- yaffs_CalcTagsECC(tags);
-
- return 1; // recovered error
- }
- else if(ecc)
- {
- // Wierd ecc failure value
- // TODO Need to do somethiong here
- return -1; //unrecovered error
- }
-
- return 0;
-}
+ if (dev->block_info_alt && dev->block_info)
+ vfree(dev->block_info);
+ else
+ kfree(dev->block_info);
-static void yaffs_LoadTagsIntoSpare(yaffs_Spare *sparePtr, yaffs_Tags *tagsPtr)
-{
- yaffs_TagsUnion *tu = (yaffs_TagsUnion *)tagsPtr;
-
- yaffs_CalcTagsECC(tagsPtr);
-
- sparePtr->tagByte0 = tu->asBytes[0];
- sparePtr->tagByte1 = tu->asBytes[1];
- sparePtr->tagByte2 = tu->asBytes[2];
- sparePtr->tagByte3 = tu->asBytes[3];
- sparePtr->tagByte4 = tu->asBytes[4];
- sparePtr->tagByte5 = tu->asBytes[5];
- sparePtr->tagByte6 = tu->asBytes[6];
- sparePtr->tagByte7 = tu->asBytes[7];
+ dev->block_info_alt = 0;
+
+ 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 void yaffs_GetTagsFromSpare(yaffs_Device *dev, yaffs_Spare *sparePtr,yaffs_Tags *tagsPtr)
+static int yaffs_init_blocks(struct yaffs_dev *dev)
{
- yaffs_TagsUnion *tu = (yaffs_TagsUnion *)tagsPtr;
- int result;
+ int n_blocks = dev->internal_end_block - dev->internal_start_block + 1;
- tu->asBytes[0]= sparePtr->tagByte0;
- tu->asBytes[1]= sparePtr->tagByte1;
- tu->asBytes[2]= sparePtr->tagByte2;
- tu->asBytes[3]= sparePtr->tagByte3;
- tu->asBytes[4]= sparePtr->tagByte4;
- tu->asBytes[5]= sparePtr->tagByte5;
- tu->asBytes[6]= sparePtr->tagByte6;
- tu->asBytes[7]= sparePtr->tagByte7;
-
- result = yaffs_CheckECCOnTags(tagsPtr);
- if(result> 0)
- {
- dev->tagsEccFixed++;
+ 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;
}
- else if(result <0)
- {
- dev->tagsEccUnfixed++;
+
+ 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;
-static void yaffs_SpareInitialise(yaffs_Spare *spare)
-{
- memset(spare,0xFF,sizeof(yaffs_Spare));
+
+ 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;
}
-#endif
-#if 0
-static int yaffs_WriteNewChunkWithTagsToNAND(yaffs_Device *dev, const __u8 *buffer, yaffs_ExtendedTags *tags, int useReserve)
+void yaffs_block_became_dirty(struct yaffs_dev *dev, int block_no)
{
- // NB There must be tags, data is optional
- // If there is data, then an ECC is calculated on it.
-
- yaffs_Spare spare;
-
- if(!tags)
- {
- return YAFFS_FAIL;
- }
-
- //yaffs_SpareInitialise(&spare);
-
- //if(!dev->useNANDECC && buffer)
- //{
- // yaffs_CalcECC(buffer,&spare);
- //}
-
- //yaffs_LoadTagsIntoSpare(&spare,tags);
-
- return yaffs_WriteNewChunkToNAND(dev,buffer,&spare,useReserve);
-
-}
-#endif
+ struct yaffs_block_info *bi = yaffs_get_block_info(dev, block_no);
+ int erased_ok = 0;
+ int i;
-static int yaffs_TagsMatch(const yaffs_ExtendedTags *tags, int objectId, int chunkInObject)
-{
- return ( tags->chunkId == chunkInObject &&
- tags->objectId == objectId &&
- !tags->chunkDeleted) ? 1 : 0;
-
-}
-
-/////////////////////////////////////////////////////////////////////////////////////////////////////////
-
-
-static int yaffs_FindChunkInFile(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;
- int retVal = -1;
-
- yaffs_Device *dev = in->myDev;
-
-
- if(!tags)
- {
- // Passed a NULL, so use our own tags space
- tags = &localTags;
- }
-
- tn = yaffs_FindLevel0Tnode(dev,&in->variant.fileVariant, chunkInInode);
-
- if(tn)
- {
- theChunk = tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] << dev->chunkGroupBits;
-
- retVal = yaffs_FindChunkInGroup(dev,theChunk,tags,in->objectId,chunkInInode);
- }
- return retVal;
-}
-
-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;
-
- yaffs_Device *dev = in->myDev;
- int retVal = -1;
-
- if(!tags)
- {
- // Passed a NULL, so use our own tags space
- tags = &localTags;
- }
-
- tn = yaffs_FindLevel0Tnode(dev,&in->variant.fileVariant, chunkInInode);
-
- if(tn)
- {
-
- theChunk = tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] << dev->chunkGroupBits;
-
- retVal = yaffs_FindChunkInGroup(dev,theChunk,tags,in->objectId,chunkInInode);
-
- // Delete the entry in the filestructure (if found)
- if(retVal != -1)
- {
- tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] = 0;
- }
- }
- else
- {
- //T(("No level 0 found for %d\n", chunkInInode));
- }
-
- if(retVal == -1)
- {
- //T(("Could not find %d to delete\n",chunkInInode));
- }
- return retVal;
-}
+ /* 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" : "");
-#ifdef YAFFS_PARANOID
+ yaffs2_clear_oldest_dirty_seq(dev, bi);
-static int yaffs_CheckFileSanity(yaffs_Object *in)
-{
- 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)
- {
- //T(("Object not a file\n"));
- return YAFFS_FAIL;
+ bi->block_state = YAFFS_BLOCK_STATE_DIRTY;
+
+ /* If this is the block being garbage collected then stop gc'ing */
+ if (block_no == dev->gc_block)
+ dev->gc_block = 0;
+
+ /* 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;
}
-
- objId = in->objectId;
- fSize = in->variant.fileVariant.fileSize;
- nChunks = (fSize + in->myDev->nBytesPerChunk -1)/in->myDev->nBytesPerChunk;
-
- for(chunk = 1; chunk <= nChunks; chunk++)
- {
- tn = yaffs_FindLevel0Tnode(in->myDev,&in->variant.fileVariant, chunk);
-
- if(tn)
- {
-
- theChunk = tn->level0[chunk & YAFFS_TNODES_LEVEL0_MASK] << in->myDev->chunkGroupBits;
-
- if(yaffs_CheckChunkBits(dev,theChunk/dev->nChunksPerBlock,theChunk%dev->nChunksPerBlock))
- {
-
-
- yaffs_ReadChunkTagsFromNAND(in->myDev,theChunk,tags,&chunkDeleted);
- if(yaffs_TagsMatch(tags,in->objectId,chunk,chunkDeleted))
- {
- // found it;
-
- }
- }
- else
- {
- //T(("File problem file [%d,%d] NAND %d tags[%d,%d]\n",
- // objId,chunk,theChunk,tags->chunkId,tags->objectId);
-
- failed = 1;
-
- }
-
- }
- else
- {
- //T(("No level 0 found for %d\n", chunk));
+
+ 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 failed ? YAFFS_FAIL : YAFFS_OK;
-}
-
-#endif
-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
- yaffs_Tnode *tn;
- yaffs_Device *dev = in->myDev;
- int existingChunk;
- yaffs_ExtendedTags existingTags;
- yaffs_ExtendedTags newTags;
- unsigned existingSerial, newSerial;
-
- 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();
+ /* 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);
+ }
}
-
- yaffs_DeleteChunk(dev,chunkInNAND,1,__LINE__);
- return YAFFS_OK;
}
-
- tn = yaffs_AddOrFindLevel0Tnode(dev,&in->variant.fileVariant, chunkInInode);
- if(!tn)
- {
- return YAFFS_FAIL;
+
+ 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;
}
- existingChunk = tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK];
-
- 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);
+ /* 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.
+ */
+
+ /* 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;
}
- if(existingChunk <=0)
- {
- //Hoosterman - how did this happen?
-
- T(YAFFS_TRACE_ERROR, (TSTR("yaffs tragedy: existing chunk < 0 in scan" TENDSTR)));
+ 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);
+ }
+
+ if (new_chunk < 0) {
+ ret_val = YAFFS_FAIL;
+ } else {
- }
+ /* Now fix up the Tnodes etc. */
-
- // NB The deleted flags should be false, otherwise the chunks will
- // not be loaded during a scan
-
- newSerial = newTags.serialNumber;
- existingSerial = existingTags.serialNumber;
-
- if( (inScan > 0) &&
- ( in->myDev->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__);
- }
- 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;
+ 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);
}
}
-
- }
-
- if(existingChunk == 0)
- {
- in->nDataChunks++;
}
-
- tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] = (chunkInNAND >> dev->chunkGroupBits);
-
- return YAFFS_OK;
+ if (ret_val == YAFFS_OK)
+ yaffs_chunk_del(dev, old_chunk, mark_flash, __LINE__);
+ return ret_val;
}
+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);
+ is_checkpt_block = (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT);
-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));
+ 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);
- memset(buffer,0,in->myDev->nBytesPerChunk); // get sane data if you read a hole
- return 0;
- }
+ /*yaffs_verify_free_chunks(dev); */
-}
+ if (bi->block_state == YAFFS_BLOCK_STATE_FULL)
+ bi->block_state = YAFFS_BLOCK_STATE_COLLECTING;
+ bi->has_shrink_hdr = 0; /* clear the flag so that the block can erase */
-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->nChunksPerBlock;
- page = chunkId % dev->nChunksPerBlock;
-
- bi = yaffs_GetBlockInfo(dev,block);
-
- T(YAFFS_TRACE_DELETION,(TSTR("line %d delete of chunk %d" TENDSTR),lyn,chunkId));
-
- if(markNAND &&
- bi->blockState != YAFFS_BLOCK_STATE_COLLECTING &&
- !dev->isYaffs2)
- {
-// yaffs_SpareInitialise(&spare);
+ dev->gc_disable = 1;
-#ifdef CONFIG_MTD_NAND_VERIFY_WRITE
+ yaffs_summary_gc(dev, block);
- //read data before write, to ensure correct ecc
- //if we're using MTD verification under Linux
- yaffs_ReadChunkFromNAND(dev,chunkId,NULL,&spare,0);
-#endif
+ if (is_checkpt_block || !yaffs_still_some_chunks(dev, block)) {
+ yaffs_trace(YAFFS_TRACE_TRACING,
+ "Collecting block %d that has no chunks in use",
+ block);
+ yaffs_block_became_dirty(dev, block);
+ } else {
- yaffs_InitialiseTags(&tags);
+ u8 *buffer = yaffs_get_temp_buffer(dev);
- tags.chunkDeleted = 1;
+ yaffs_verify_blk(dev, bi, block);
-
- 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++;
+ max_copies = (whole_block) ? dev->param.chunks_per_block : 5;
+ old_chunk = block * dev->param.chunks_per_block + dev->gc_chunk;
- 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);
- }
+ for (/* init already done */ ;
+ ret_val == YAFFS_OK &&
+ dev->gc_chunk < dev->param.chunks_per_block &&
+ (bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) &&
+ max_copies > 0;
+ dev->gc_chunk++, old_chunk++) {
+ if (yaffs_check_chunk_bit(dev, block, dev->gc_chunk)) {
+ /* Page is in use and might need to be copied */
+ max_copies--;
+ ret_val = yaffs_gc_process_chunk(dev, bi,
+ old_chunk, buffer);
+ }
+ }
+ yaffs_release_temp_buffer(dev, buffer);
+ }
+
+ yaffs_verify_collected_blk(dev, bi, block);
+
+ if (bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) {
+ /*
+ * The gc did not complete. Set block state back to FULL
+ * because checkpointing does not restore gc.
+ */
+ bi->block_state = YAFFS_BLOCK_STATE_FULL;
+ } else {
+ /* The gc completed. */
+ /* Do any required cleanups */
+ for (i = 0; i < dev->n_clean_ups; i++) {
+ /* Time to delete the file too */
+ struct yaffs_obj *object =
+ yaffs_find_by_number(dev, dev->gc_cleanup_list[i]);
+ if (object) {
+ yaffs_free_tnode(dev,
+ object->variant.file_variant.top);
+ object->variant.file_variant.top = NULL;
+ yaffs_trace(YAFFS_TRACE_GC,
+ "yaffs: About to finally delete object %d",
+ object->obj_id);
+ yaffs_generic_obj_del(object);
+ object->my_dev->n_deleted_files--;
+ }
+ }
+ chunks_after = yaffs_get_erased_chunks(dev);
+ if (chunks_before >= chunks_after)
+ yaffs_trace(YAFFS_TRACE_GC,
+ "gc did not increase free chunks before %d after %d",
+ chunks_before, chunks_after);
+ dev->gc_block = 0;
+ dev->gc_chunk = 0;
+ dev->n_clean_ups = 0;
}
- else
- {
- // T(("Bad news deleting chunk %d\n",chunkId));
- }
-
-}
+ dev->gc_disable = 0;
+ return ret_val;
+}
+/*
+ * find_gc_block() selects the dirtiest block (or close enough)
+ * for garbage collection.
+ */
-static int yaffs_WriteChunkDataToObject(yaffs_Object *in,int chunkInInode, const __u8 *buffer,int nBytes,int useReserve)
+static unsigned yaffs_find_gc_block(struct yaffs_dev *dev,
+ int aggressive, int background)
{
- // Find old chunk Need to do this to get serial number
- // Write new one and patch into tree.
- // Invalidate old tags.
+ int i;
+ int iterations;
+ unsigned selected = 0;
+ int prioritised = 0;
+ int prioritised_exist = 0;
+ struct yaffs_block_info *bi;
+ int threshold;
+
+ /* First let's see if we need to grab a prioritised block */
+ if (dev->has_pending_prioritised_gc && !aggressive) {
+ dev->gc_dirtiest = 0;
+ bi = dev->block_info;
+ for (i = dev->internal_start_block;
+ i <= dev->internal_end_block && !selected; i++) {
+
+ if (bi->gc_prioritise) {
+ prioritised_exist = 1;
+ if (bi->block_state == YAFFS_BLOCK_STATE_FULL &&
+ yaffs_block_ok_for_gc(dev, bi)) {
+ selected = i;
+ prioritised = 1;
+ }
+ }
+ bi++;
+ }
- int prevChunkId;
- yaffs_ExtendedTags prevTags;
-
- int newChunkId;
- yaffs_ExtendedTags newTags;
+ /*
+ * If there is a prioritised block and none was selected then
+ * this happened because there is at least one old dirty block
+ * gumming up the works. Let's gc the oldest dirty block.
+ */
+
+ if (prioritised_exist &&
+ !selected && dev->oldest_dirty_block > 0)
+ selected = dev->oldest_dirty_block;
+
+ if (!prioritised_exist) /* None found, so we can clear this */
+ dev->has_pending_prioritised_gc = 0;
+ }
+
+ /* If we're doing aggressive GC then we are happy to take a less-dirty
+ * block, and search harder.
+ * else (leasurely gc), then we only bother to do this if the
+ * block has only a few pages in use.
+ */
+
+ if (!selected) {
+ int pages_used;
+ int n_blocks =
+ dev->internal_end_block - dev->internal_start_block + 1;
+ if (aggressive) {
+ threshold = dev->param.chunks_per_block;
+ iterations = n_blocks;
+ } else {
+ int max_threshold;
+
+ if (background)
+ max_threshold = dev->param.chunks_per_block / 2;
+ else
+ max_threshold = dev->param.chunks_per_block / 8;
- yaffs_Device *dev = in->myDev;
+ if (max_threshold < YAFFS_GC_PASSIVE_THRESHOLD)
+ max_threshold = YAFFS_GC_PASSIVE_THRESHOLD;
- yaffs_CheckGarbageCollection(dev);
+ threshold = background ? (dev->gc_not_done + 2) * 2 : 0;
+ if (threshold < YAFFS_GC_PASSIVE_THRESHOLD)
+ threshold = YAFFS_GC_PASSIVE_THRESHOLD;
+ if (threshold > max_threshold)
+ threshold = max_threshold;
- // Get the previous chunk at this location in the file if it exists
- prevChunkId = yaffs_FindChunkInFile(in,chunkInInode,&prevTags);
-
- // 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;
-
-// yaffs_CalcTagsECC(&newTags);
+ iterations = n_blocks / 16 + 1;
+ if (iterations > 100)
+ iterations = 100;
+ }
- 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__);
-
+ for (i = 0;
+ i < iterations &&
+ (dev->gc_dirtiest < 1 ||
+ dev->gc_pages_in_use > YAFFS_GC_GOOD_ENOUGH);
+ i++) {
+ dev->gc_block_finder++;
+ if (dev->gc_block_finder < dev->internal_start_block ||
+ dev->gc_block_finder > dev->internal_end_block)
+ dev->gc_block_finder =
+ dev->internal_start_block;
+
+ bi = yaffs_get_block_info(dev, dev->gc_block_finder);
+
+ pages_used = bi->pages_in_use - bi->soft_del_pages;
+
+ if (bi->block_state == YAFFS_BLOCK_STATE_FULL &&
+ pages_used < dev->param.chunks_per_block &&
+ (dev->gc_dirtiest < 1 ||
+ pages_used < dev->gc_pages_in_use) &&
+ yaffs_block_ok_for_gc(dev, bi)) {
+ dev->gc_dirtiest = dev->gc_block_finder;
+ dev->gc_pages_in_use = pages_used;
+ }
}
-
- yaffs_CheckFileSanity(in);
- }
- return newChunkId;
+ if (dev->gc_dirtiest > 0 && dev->gc_pages_in_use <= threshold)
+ selected = dev->gc_dirtiest;
+ }
+
+ /*
+ * If nothing has been selected for a while, try the oldest dirty
+ * because that's gumming up the works.
+ */
+
+ if (!selected && dev->param.is_yaffs2 &&
+ dev->gc_not_done >= (background ? 10 : 20)) {
+ yaffs2_find_oldest_dirty_seq(dev);
+ if (dev->oldest_dirty_block > 0) {
+ selected = dev->oldest_dirty_block;
+ dev->gc_dirtiest = selected;
+ dev->oldest_dirty_gc_count++;
+ bi = yaffs_get_block_info(dev, selected);
+ dev->gc_pages_in_use =
+ bi->pages_in_use - bi->soft_del_pages;
+ } else {
+ dev->gc_not_done = 0;
+ }
+ }
+ if (selected) {
+ yaffs_trace(YAFFS_TRACE_GC,
+ "GC Selected block %d with %d free, prioritised:%d",
+ selected,
+ dev->param.chunks_per_block - dev->gc_pages_in_use,
+ prioritised);
+ dev->n_gc_blocks++;
+ if (background)
+ dev->bg_gcs++;
+ dev->gc_dirtiest = 0;
+ dev->gc_pages_in_use = 0;
+ dev->gc_not_done = 0;
+ if (dev->refresh_skip > 0)
+ dev->refresh_skip--;
+ } else {
+ dev->gc_not_done++;
+ yaffs_trace(YAFFS_TRACE_GC,
+ "GC none: finder %d skip %d threshold %d dirtiest %d using %d oldest %d%s",
+ dev->gc_block_finder, dev->gc_not_done, threshold,
+ dev->gc_dirtiest, dev->gc_pages_in_use,
+ dev->oldest_dirty_block, background ? " bg" : "");
+ }
+ return selected;
}
-
-// 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)
+/* 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 only accepts 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_check_gc(struct yaffs_dev *dev, int background)
{
+ int aggressive = 0;
+ int gc_ok = YAFFS_OK;
+ int max_tries = 0;
+ int min_erased;
+ int erased_chunks;
+ int checkpt_block_adjust;
- yaffs_BlockInfo *bi;
-
- yaffs_Device *dev = in->myDev;
-
- int prevChunkId;
- int retVal = 0;
-
- int newChunkId;
- yaffs_ExtendedTags newTags;
-
- __u8 *buffer = NULL;
- YCHAR oldName[YAFFS_MAX_NAME_LENGTH+1];
-
- // __u8 bufferOld[YAFFS_BYTES_PER_CHUNK];
-
- yaffs_ObjectHeader *oh = NULL;
- // yaffs_ObjectHeader *ohOld = (yaffs_ObjectHeader *)bufferOld;
+ if (dev->param.gc_control && (dev->param.gc_control(dev) & 1) == 0)
+ return YAFFS_OK;
-
- if(!in->fake || force)
- {
-
- yaffs_CheckGarbageCollection(dev);
-
- buffer = yaffs_GetTempBuffer(in->myDev,__LINE__);
- oh = (yaffs_ObjectHeader *)buffer;
-
- prevChunkId = in->chunkId;
-
- if(prevChunkId >= 0)
- {
- yaffs_ReadChunkWithTagsFromNAND(dev,prevChunkId,buffer,NULL);
- memcpy(oldName,oh->name,sizeof(oh->name));
- }
+ if (dev->gc_disable)
+ /* Bail out so we don't get recursive gc */
+ return YAFFS_OK;
- memset(buffer,0xFF,dev->nBytesPerChunk);
-
- // Header data
- oh->type = in->variantType;
-
- oh->yst_mode = in->yst_mode;
-
- // shadowing
- oh->shadowsObject = 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;
- }
-
- //oh->sum = in->sum;
- if(name && *name)
- {
- memset(oh->name,0,sizeof(oh->name));
- yaffs_strncpy(oh->name,name,YAFFS_MAX_NAME_LENGTH);
- }
- else if(prevChunkId)
- {
- memcpy(oh->name, oldName,sizeof(oh->name));
- }
- else
- {
- memset(oh->name,0,sizeof(oh->name));
- }
-
- oh->isShrink = isShrink;
-
- 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:
- yaffs_strncpy(oh->alias,in->variant.symLinkVariant.alias,YAFFS_MAX_ALIAS_LENGTH);
- oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
+ /* This loop should pass the first time.
+ * Only loops here if the collection does not increase space.
+ */
+
+ do {
+ max_tries++;
+
+ checkpt_block_adjust = yaffs_calc_checkpt_blocks_required(dev);
+
+ min_erased =
+ dev->param.n_reserved_blocks + checkpt_block_adjust + 1;
+ erased_chunks =
+ dev->n_erased_blocks * dev->param.chunks_per_block;
+
+ /* If we need a block soon then do aggressive gc. */
+ if (dev->n_erased_blocks < min_erased)
+ aggressive = 1;
+ else {
+ if (!background
+ && erased_chunks > (dev->n_free_chunks / 4))
break;
- }
- // Tags
- yaffs_InitialiseTags(&newTags);
- in->serial++;
- newTags.chunkId = 0;
- newTags.objectId = in->objectId;
- newTags.serialNumber = in->serial;
-
- // Add extra info for file header
-
- 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;
-
- // Create new chunk in NAND
- newChunkId = yaffs_WriteNewChunkWithTagsToNAND(dev,buffer,&newTags, (prevChunkId >= 0) ? 1 : 0 );
-
- if(newChunkId >= 0)
- {
-
- in->chunkId = newChunkId;
-
- if(prevChunkId >= 0)
- {
- yaffs_DeleteChunk(dev,prevChunkId,1,__LINE__);
- }
-
- in->dirty = 0;
-
- // If this was a shrink, then mark the block that the chunk lives on
- if(isShrink)
- {
- bi = yaffs_GetBlockInfo(in->myDev,newChunkId / in->myDev->nChunksPerBlock);
- bi->hasShrinkHeader = 1;
+ if (dev->gc_skip > 20)
+ dev->gc_skip = 20;
+ if (erased_chunks < dev->n_free_chunks / 2 ||
+ dev->gc_skip < 1 || background)
+ aggressive = 0;
+ else {
+ dev->gc_skip--;
+ break;
}
-
}
-
- retVal = newChunkId;
-
- }
-
- if(buffer)
- yaffs_ReleaseTempBuffer(dev,buffer,__LINE__);
-
- return retVal;
-}
+ dev->gc_skip = 5;
-/////////////////////// Short Operations Cache ////////////////////////////////
-// In many siturations 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.
-// There are a limited number (~10) of cache chunks per device so that we don't
-// need a very intelligent search.
-
+ /* If we don't already have a block being gc'd then see if we
+ * should start another */
+ if (dev->gc_block < 1 && !aggressive) {
+ dev->gc_block = yaffs2_find_refresh_block(dev);
+ dev->gc_chunk = 0;
+ dev->n_clean_ups = 0;
+ }
+ if (dev->gc_block < 1) {
+ dev->gc_block =
+ yaffs_find_gc_block(dev, aggressive, background);
+ dev->gc_chunk = 0;
+ dev->n_clean_ups = 0;
+ }
+ if (dev->gc_block > 0) {
+ dev->all_gcs++;
+ if (!aggressive)
+ dev->passive_gc_count++;
+ yaffs_trace(YAFFS_TRACE_GC,
+ "yaffs: GC n_erased_blocks %d aggressive %d",
+ dev->n_erased_blocks, aggressive);
-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 nBytes;
- int nCaches = obj->myDev->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(cache && !cache->locked)
- {
- //Write it out and free it up
-
-#if 0
- nBytes = cache->object->variant.fileVariant.fileSize - ((cache->chunkId -1) * YAFFS_BYTES_PER_CHUNK);
-
- if(nBytes > YAFFS_BYTES_PER_CHUNK)
- {
- nBytes= YAFFS_BYTES_PER_CHUNK;
- }
-#endif
- chunkWritten = yaffs_WriteChunkDataToObject(cache->object,
- cache->chunkId,
- cache->data,
- cache->nBytes,1);
-
- cache->dirty = 0;
- cache->object = NULL;
- }
-
- } while(cache && chunkWritten > 0);
-
- if(cache)
- {
- //Hoosterman, disk full while writing cache out.
- T(YAFFS_TRACE_ERROR, (TSTR("yaffs tragedy: no space during cache write" TENDSTR)));
+ gc_ok = yaffs_gc_block(dev, dev->gc_block, aggressive);
+ }
+ if (dev->n_erased_blocks < (dev->param.n_reserved_blocks) &&
+ dev->gc_block > 0) {
+ yaffs_trace(YAFFS_TRACE_GC,
+ "yaffs: GC !!!no reclaim!!! n_erased_blocks %d after try %d block %d",
+ dev->n_erased_blocks, max_tries,
+ dev->gc_block);
}
- }
-
-}
+ } while ((dev->n_erased_blocks < dev->param.n_reserved_blocks) &&
+ (dev->gc_block > 0) && (max_tries < 2));
+ return aggressive ? gc_ok : YAFFS_OK;
+}
-// Grab us a 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)
+/*
+ * yaffs_bg_gc()
+ * Garbage collects. Intended to be called from a background thread.
+ * Returns non-zero if at least half the free chunks are erased.
+ */
+int yaffs_bg_gc(struct yaffs_dev *dev, unsigned urgency)
{
- int i;
- int usage;
- int theOne;
-
- if(dev->nShortOpCaches > 0)
- {
- for(i = 0; i < dev->nShortOpCaches; i++)
- {
- if(!dev->srCache[i].object)
- {
- //T(("Grabbing empty %d\n",i));
-
- //printf("Grabbing empty %d\n",i);
-
- return &dev->srCache[i];
- }
- }
-
- return NULL;
-
- theOne = -1;
- usage = 0; // just to stop the compiler grizzling
-
- for(i = 0; i < dev->nShortOpCaches; i++)
- {
- if(!dev->srCache[i].dirty &&
- ((dev->srCache[i].lastUse < usage && theOne >= 0)||
- theOne < 0))
- {
- usage = dev->srCache[i].lastUse;
- theOne = i;
- }
- }
-
- //T(("Grabbing non-empty %d\n",theOne));
-
- //if(theOne >= 0) printf("Grabbed non-empty cache %d\n",theOne);
-
- return theOne >= 0 ? &dev->srCache[theOne] : NULL;
- }
- else
- {
- return NULL;
- }
-
+ int erased_chunks = dev->n_erased_blocks * dev->param.chunks_per_block;
+
+ yaffs_trace(YAFFS_TRACE_BACKGROUND, "Background gc %u", urgency);
+
+ yaffs_check_gc(dev, 1);
+ return erased_chunks > dev->n_free_chunks / 2;
}
+/*-------------------- Data file manipulation -----------------*/
-static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device *dev)
+static int yaffs_rd_data_obj(struct yaffs_obj *in, int inode_chunk, u8 * buffer)
{
- yaffs_ChunkCache *cache;
- yaffs_Object *theObj;
- int usage;
- int i;
- int pushout;
-
- if(dev->nShortOpCaches > 0)
- {
- // Try find a non-dirty one...
-
- cache = yaffs_GrabChunkCacheWorker(dev);
-
- 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.
-
- // With locking we can't assume we can use entry zero
-
-
- theObj = NULL;
- usage = -1;
- cache = NULL;
- pushout = -1;
-
- for(i = 0; i < dev->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(!cache || cache->dirty)
- {
-
- //printf("Dirty ");
- yaffs_FlushFilesChunkCache(theObj);
-
- // Try again
- cache = yaffs_GrabChunkCacheWorker(dev);
- }
- else
- {
- //printf(" pushout %d\n",pushout);
- }
-
- }
- return cache;
+ int nand_chunk = yaffs_find_chunk_in_file(in, inode_chunk, NULL);
+
+ if (nand_chunk >= 0)
+ return yaffs_rd_chunk_tags_nand(in->my_dev, nand_chunk,
+ buffer, NULL);
+ else {
+ yaffs_trace(YAFFS_TRACE_NANDACCESS,
+ "Chunk %d not found zero instead",
+ nand_chunk);
+ /* get sane (zero) data if you read a hole */
+ memset(buffer, 0, in->my_dev->data_bytes_per_chunk);
+ return 0;
}
- else
- return NULL;
}
-
-// Find a cached chunk
-static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object *obj, int chunkId)
+void yaffs_chunk_del(struct yaffs_dev *dev, int chunk_id, int mark_flash,
+ int lyn)
{
- yaffs_Device *dev = obj->myDev;
- int i;
- if(dev->nShortOpCaches > 0)
- {
- for(i = 0; i < dev->nShortOpCaches; i++)
- {
- if(dev->srCache[i].object == obj &&
- dev->srCache[i].chunkId == chunkId)
- {
- dev->cacheHits++;
-
- return &dev->srCache[i];
- }
+ int block;
+ int page;
+ struct yaffs_ext_tags tags;
+ struct yaffs_block_info *bi;
+
+ if (chunk_id <= 0)
+ return;
+
+ dev->n_deletions++;
+ block = chunk_id / dev->param.chunks_per_block;
+ page = chunk_id % dev->param.chunks_per_block;
+
+ if (!yaffs_check_chunk_bit(dev, block, page))
+ yaffs_trace(YAFFS_TRACE_VERIFY,
+ "Deleting invalid chunk %d", chunk_id);
+
+ bi = yaffs_get_block_info(dev, block);
+
+ yaffs2_update_oldest_dirty_seq(dev, block, bi);
+
+ yaffs_trace(YAFFS_TRACE_DELETION,
+ "line %d delete of chunk %d",
+ lyn, chunk_id);
+
+ if (!dev->param.is_yaffs2 && mark_flash &&
+ bi->block_state != YAFFS_BLOCK_STATE_COLLECTING) {
+
+ memset(&tags, 0, sizeof(tags));
+ tags.is_deleted = 1;
+ yaffs_wr_chunk_tags_nand(dev, chunk_id, NULL, &tags);
+ yaffs_handle_chunk_update(dev, chunk_id, &tags);
+ } else {
+ dev->n_unmarked_deletions++;
+ }
+
+ /* Pull out of the management area.
+ * If the whole block became dirty, this will kick off an erasure.
+ */
+ if (bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING ||
+ bi->block_state == YAFFS_BLOCK_STATE_FULL ||
+ bi->block_state == YAFFS_BLOCK_STATE_NEEDS_SCAN ||
+ bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) {
+ dev->n_free_chunks++;
+ yaffs_clear_chunk_bit(dev, block, page);
+ bi->pages_in_use--;
+
+ if (bi->pages_in_use == 0 &&
+ !bi->has_shrink_hdr &&
+ bi->block_state != YAFFS_BLOCK_STATE_ALLOCATING &&
+ bi->block_state != YAFFS_BLOCK_STATE_NEEDS_SCAN) {
+ yaffs_block_became_dirty(dev, block);
}
}
- return NULL;
}
-// Mark the chunk for the least recently used algorithym
-static void yaffs_UseChunkCache(yaffs_Device *dev, yaffs_ChunkCache *cache, int isAWrite)
+static int yaffs_wr_data_obj(struct yaffs_obj *in, int inode_chunk,
+ const u8 *buffer, int n_bytes, int use_reserve)
{
+ /* Find old chunk Need to do this to get serial number
+ * Write new one and patch into tree.
+ * Invalidate old tags.
+ */
- if(dev->nShortOpCaches > 0)
- {
- if( dev->srLastUse < 0 ||
- dev->srLastUse > 100000000)
- {
- // Reset the cache usages
- int i;
- for(i = 1; i < dev->nShortOpCaches; i++)
- {
- dev->srCache[i].lastUse = 0;
- }
- dev->srLastUse = 0;
- }
+ int prev_chunk_id;
+ struct yaffs_ext_tags prev_tags;
+ int new_chunk_id;
+ struct yaffs_ext_tags new_tags;
+ struct yaffs_dev *dev = in->my_dev;
- dev->srLastUse++;
-
- cache->lastUse = dev->srLastUse;
+ yaffs_check_gc(dev, 0);
- if(isAWrite)
- {
- cache->dirty = 1;
- }
- }
-}
+ /* 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.
+ */
+ prev_chunk_id = yaffs_find_chunk_in_file(in, inode_chunk, &prev_tags);
+ if (prev_chunk_id < 1 &&
+ !yaffs_put_chunk_in_file(in, inode_chunk, 0, 0))
+ return 0;
-// 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)
-{
- if(object->myDev->nShortOpCaches > 0)
- {
- yaffs_ChunkCache *cache = yaffs_FindChunkCache(object,chunkId);
+ /* Set up new tags */
+ memset(&new_tags, 0, sizeof(new_tags));
- if(cache)
- {
- cache->object = NULL;
- }
+ new_tags.chunk_id = inode_chunk;
+ new_tags.obj_id = in->obj_id;
+ new_tags.serial_number =
+ (prev_chunk_id > 0) ? prev_tags.serial_number + 1 : 1;
+ new_tags.n_bytes = n_bytes;
+
+ if (n_bytes < 1 || n_bytes > dev->param.total_bytes_per_chunk) {
+ yaffs_trace(YAFFS_TRACE_ERROR,
+ "Writing %d bytes to chunk!!!!!!!!!",
+ n_bytes);
+ BUG();
}
-}
+ new_chunk_id =
+ yaffs_write_new_chunk(dev, buffer, &new_tags, use_reserve);
-// Invalidate all the cache pages associated with this object
-// Do this whenever ther file is deleted or resized.
-static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in)
-{
- int i;
- yaffs_Device *dev = in->myDev;
-
- if(dev->nShortOpCaches > 0)
- {
- // Now invalidate it.
- for(i = 0; i < dev->nShortOpCaches; i++)
- {
- if(dev->srCache[i].object == in)
- {
- dev->srCache[i].object = NULL;
- }
- }
- }
-}
+ if (new_chunk_id > 0) {
+ yaffs_put_chunk_in_file(in, inode_chunk, new_chunk_id, 0);
+ if (prev_chunk_id > 0)
+ yaffs_chunk_del(dev, prev_chunk_id, 1, __LINE__);
+ yaffs_verify_file_sane(in);
+ }
+ return new_chunk_id;
+}
-///////////////////////// 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
-//
-// Curve-balls: the first chunk might also be the last chunk.
-int yaffs_ReadDataFromFile(yaffs_Object *in, __u8 * buffer, __u32 offset, int nBytes)
+static int yaffs_do_xattrib_mod(struct yaffs_obj *obj, int set,
+ const YCHAR *name, const void *value, int size,
+ int flags)
{
-
-
- int chunk;
- int start;
- int nToCopy;
- int n = nBytes;
- int nDone = 0;
- yaffs_ChunkCache *cache;
-
- yaffs_Device *dev;
-
- dev = in->myDev;
-
- while(n > 0)
- {
- chunk = offset / dev->nBytesPerChunk + 1; // The first chunk is 1
- start = offset % dev->nBytesPerChunk;
-
- // OK now check for the curveball where the start and end are in
- // the same chunk.
- if( (start + n) < dev->nBytesPerChunk)
- {
- nToCopy = n;
- }
- else
- {
- nToCopy = dev->nBytesPerChunk - start;
- }
-
- cache = yaffs_FindChunkCache(in,chunk);
-
- // If the chunk is already in the cache or it is less than a whole chunk
- // then use the cache (if there is caching)
- // else bypass the cache.
- if( cache || nToCopy != dev->nBytesPerChunk)
- {
- if(dev->nShortOpCaches > 0)
- {
-
- // If we can't find the data in the cache, then load it up.
-
- 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;
- }
-
- yaffs_UseChunkCache(dev,cache,0);
+ struct yaffs_xattr_mod xmod;
+ int result;
- cache->locked = 1;
+ xmod.set = set;
+ xmod.name = name;
+ xmod.data = value;
+ xmod.size = size;
+ xmod.flags = flags;
+ xmod.result = -ENOSPC;
-#ifdef CONFIG_YAFFS_WINCE
- yfsd_UnlockYAFFS(TRUE);
-#endif
- memcpy(buffer,&cache->data[start],nToCopy);
+ result = yaffs_update_oh(obj, NULL, 0, 0, 0, &xmod);
-#ifdef CONFIG_YAFFS_WINCE
- yfsd_LockYAFFS(TRUE);
-#endif
- cache->locked = 0;
- }
- else
- {
- // Read into the local buffer then copy...
-
- __u8 *localBuffer = yaffs_GetTempBuffer(dev,__LINE__);
- yaffs_ReadChunkDataFromObject(in,chunk,localBuffer);
-#ifdef CONFIG_YAFFS_WINCE
- yfsd_UnlockYAFFS(TRUE);
-#endif
- memcpy(buffer,&localBuffer[start],nToCopy);
+ if (result > 0)
+ return xmod.result;
+ else
+ return -ENOSPC;
+}
-#ifdef CONFIG_YAFFS_WINCE
- yfsd_LockYAFFS(TRUE);
-#endif
- yaffs_ReleaseTempBuffer(dev,localBuffer,__LINE__);
- }
+static int yaffs_apply_xattrib_mod(struct yaffs_obj *obj, char *buffer,
+ struct yaffs_xattr_mod *xmod)
+{
+ int retval = 0;
+ int x_offs = sizeof(struct yaffs_obj_hdr);
+ struct yaffs_dev *dev = obj->my_dev;
+ int x_size = dev->data_bytes_per_chunk - sizeof(struct yaffs_obj_hdr);
+ char *x_buffer = buffer + x_offs;
- }
+ if (xmod->set)
+ retval =
+ nval_set(x_buffer, x_size, xmod->name, xmod->data,
+ xmod->size, xmod->flags);
+ else
+ retval = nval_del(x_buffer, x_size, xmod->name);
+
+ obj->has_xattr = nval_hasvalues(x_buffer, x_size);
+ obj->xattr_known = 1;
+ xmod->result = retval;
+
+ return retval;
+}
+
+static int yaffs_do_xattrib_fetch(struct yaffs_obj *obj, const YCHAR *name,
+ void *value, int size)
+{
+ char *buffer = NULL;
+ int result;
+ struct yaffs_ext_tags tags;
+ struct yaffs_dev *dev = obj->my_dev;
+ int x_offs = sizeof(struct yaffs_obj_hdr);
+ int x_size = dev->data_bytes_per_chunk - sizeof(struct yaffs_obj_hdr);
+ char *x_buffer;
+ int retval = 0;
+
+ if (obj->hdr_chunk < 1)
+ return -ENODATA;
+
+ /* If we know that the object has no xattribs then don't do all the
+ * reading and parsing.
+ */
+ if (obj->xattr_known && !obj->has_xattr) {
+ if (name)
+ return -ENODATA;
else
- {
-#ifdef CONFIG_YAFFS_WINCE
- __u8 *localBuffer = yaffs_GetTempBuffer(dev,__LINE__);
-
- // Under WinCE can't do direct transfer. Need to use a local buffer.
- // This is because we otherwise screw up WinCE's memory mapper
- yaffs_ReadChunkDataFromObject(in,chunk,localBuffer);
-
-#ifdef CONFIG_YAFFS_WINCE
- yfsd_UnlockYAFFS(TRUE);
-#endif
- memcpy(buffer,localBuffer,dev->nBytesPerChunk);
+ return 0;
+ }
-#ifdef CONFIG_YAFFS_WINCE
- yfsd_LockYAFFS(TRUE);
- yaffs_ReleaseTempBuffer(dev,localBuffer,__LINE__);
-#endif
+ buffer = (char *)yaffs_get_temp_buffer(dev);
+ if (!buffer)
+ return -ENOMEM;
-#else
- // A full chunk. Read directly into the supplied buffer.
- yaffs_ReadChunkDataFromObject(in,chunk,buffer);
-#endif
+ result =
+ yaffs_rd_chunk_tags_nand(dev, obj->hdr_chunk, (u8 *) buffer, &tags);
+
+ if (result != YAFFS_OK)
+ retval = -ENOENT;
+ else {
+ x_buffer = buffer + x_offs;
+
+ if (!obj->xattr_known) {
+ obj->has_xattr = nval_hasvalues(x_buffer, x_size);
+ obj->xattr_known = 1;
}
-
- n -= nToCopy;
- offset += nToCopy;
- buffer += nToCopy;
- nDone += nToCopy;
-
+
+ if (name)
+ retval = nval_get(x_buffer, x_size, name, value, size);
+ else
+ retval = nval_list(x_buffer, x_size, value, size);
}
-
- return nDone;
+ yaffs_release_temp_buffer(dev, (u8 *) buffer);
+ return retval;
}
+int yaffs_set_xattrib(struct yaffs_obj *obj, const YCHAR * name,
+ const void *value, int size, int flags)
+{
+ return yaffs_do_xattrib_mod(obj, 1, name, value, size, flags);
+}
+int yaffs_remove_xattrib(struct yaffs_obj *obj, const YCHAR * name)
+{
+ return yaffs_do_xattrib_mod(obj, 0, name, NULL, 0, 0);
+}
-int yaffs_WriteDataToFile(yaffs_Object *in,const __u8 * buffer, __u32 offset, int nBytes, int writeThrough)
-{
-
- int chunk;
- int start;
- int nToCopy;
- int n = nBytes;
- int nDone = 0;
- int nToWriteBack;
- int startOfWrite = offset;
- int chunkWritten = 0;
- int nBytesRead;
-
- yaffs_Device *dev;
-
- dev = in->myDev;
-
-
- while(n > 0 && chunkWritten >= 0)
- {
- chunk = offset / dev->nBytesPerChunk + 1;
- start = offset % dev->nBytesPerChunk;
-
-
- // OK now check for the curveball where the start and end are in
- // the same chunk.
-
- if((start + n) < dev->nBytesPerChunk)
- {
- nToCopy = n;
-
- // 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.
-
- nBytesRead = in->variant.fileVariant.fileSize - ((chunk -1) * dev->nBytesPerChunk);
-
- if(nBytesRead > dev->nBytesPerChunk)
- {
- nBytesRead = dev->nBytesPerChunk;
- }
-
- nToWriteBack = (nBytesRead > (start + n)) ? nBytesRead : (start +n);
-
- }
- else
- {
- nToCopy = dev->nBytesPerChunk - start;
- nToWriteBack = dev->nBytesPerChunk;
- }
-
- if(nToCopy != dev->nBytesPerChunk)
- {
- // An incomplete start or end chunk (or maybe both start and end chunk)
- if(dev->nShortOpCaches > 0)
- {
- yaffs_ChunkCache *cache;
- // If we can't find the data in the cache, then load it up.
- cache = yaffs_FindChunkCache(in,chunk);
- if(!cache && yaffs_CheckSpaceForAllocation(in->myDev))
- {
- cache = yaffs_GrabChunkCache(in->myDev);
- cache->object = in;
- cache->chunkId = chunk;
- cache->dirty = 0;
- cache->locked = 0;
- yaffs_ReadChunkDataFromObject(in,chunk,cache->data);
- }
-
- if(cache)
- {
- yaffs_UseChunkCache(dev,cache,1);
- cache->locked = 1;
-#ifdef CONFIG_YAFFS_WINCE
- yfsd_UnlockYAFFS(TRUE);
-#endif
-
- memcpy(&cache->data[start],buffer,nToCopy);
+int yaffs_get_xattrib(struct yaffs_obj *obj, const YCHAR * name, void *value,
+ int size)
+{
+ return yaffs_do_xattrib_fetch(obj, name, value, size);
+}
-#ifdef CONFIG_YAFFS_WINCE
- yfsd_LockYAFFS(TRUE);
-#endif
- cache->locked = 0;
- cache->nBytes = nToWriteBack;
-
- if(writeThrough)
- {
- chunkWritten = yaffs_WriteChunkDataToObject(cache->object,
- cache->chunkId,
- cache->data,
- cache->nBytes,1);
- cache->dirty = 0;
- }
+int yaffs_list_xattrib(struct yaffs_obj *obj, char *buffer, int size)
+{
+ return yaffs_do_xattrib_fetch(obj, NULL, buffer, size);
+}
- }
- 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.
-
- __u8 *localBuffer = yaffs_GetTempBuffer(dev,__LINE__);
-
- yaffs_ReadChunkDataFromObject(in,chunk,localBuffer);
-
-#ifdef CONFIG_YAFFS_WINCE
- yfsd_UnlockYAFFS(TRUE);
-#endif
-
- memcpy(&localBuffer[start],buffer,nToCopy);
-
-#ifdef CONFIG_YAFFS_WINCE
- yfsd_LockYAFFS(TRUE);
-#endif
- chunkWritten = yaffs_WriteChunkDataToObject(in,chunk,localBuffer,nToWriteBack,0);
-
- yaffs_ReleaseTempBuffer(dev,localBuffer,__LINE__);
-
- //T(("Write with readback to chunk %d %d start %d copied %d wrote back %d\n",chunk,chunkWritten,start, nToCopy, nToWriteBack));
+static void yaffs_check_obj_details_loaded(struct yaffs_obj *in)
+{
+ u8 *buf;
+ struct yaffs_obj_hdr *oh;
+ struct yaffs_dev *dev;
+ struct yaffs_ext_tags tags;
+ int result;
+ int alloc_failed = 0;
+
+ if (!in || !in->lazy_loaded || in->hdr_chunk < 1)
+ return;
+
+ dev = in->my_dev;
+ in->lazy_loaded = 0;
+ buf = yaffs_get_temp_buffer(dev);
+
+ result = yaffs_rd_chunk_tags_nand(dev, in->hdr_chunk, buf, &tags);
+ oh = (struct yaffs_obj_hdr *)buf;
+
+ in->yst_mode = oh->yst_mode;
+ yaffs_load_attribs(in, oh);
+ yaffs_set_obj_name_from_oh(in, oh);
+
+ if (in->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) {
+ in->variant.symlink_variant.alias =
+ yaffs_clone_str(oh->alias);
+ if (!in->variant.symlink_variant.alias)
+ alloc_failed = 1; /* Not returned */
+ }
+ yaffs_release_temp_buffer(dev, buf);
+}
+
+static void yaffs_load_name_from_oh(struct yaffs_dev *dev, YCHAR *name,
+ const YCHAR *oh_name, int buff_size)
+{
+#ifdef CONFIG_YAFFS_AUTO_UNICODE
+ if (dev->param.auto_unicode) {
+ if (*oh_name) {
+ /* It is an ASCII name, do an ASCII to
+ * unicode conversion */
+ const char *ascii_oh_name = (const char *)oh_name;
+ int n = buff_size - 1;
+ while (n > 0 && *ascii_oh_name) {
+ *name = *ascii_oh_name;
+ name++;
+ ascii_oh_name++;
+ n--;
}
-
+ } else {
+ strncpy(name, oh_name + 1, buff_size - 1);
}
- else
- {
-
-#ifdef CONFIG_YAFFS_WINCE
- // Under WinCE can't do direct transfer. Need to use a local buffer.
- // This is because we otherwise screw up WinCE's memory mapper
- __u8 *localBuffer = yaffs_GetTempBuffer(dev,__LINE__);
-#ifdef CONFIG_YAFFS_WINCE
- yfsd_UnlockYAFFS(TRUE);
-#endif
- memcpy(localBuffer,buffer,dev->nBytesPerChunk);
-#ifdef CONFIG_YAFFS_WINCE
- yfsd_LockYAFFS(TRUE);
-#endif
- chunkWritten = yaffs_WriteChunkDataToObject(in,chunk,localBuffer,dev->nBytesPerChunk,0);
- yaffs_ReleaseTempBuffer(dev,localBuffer,__LINE__);
+ } else {
#else
- // A full chunk. Write directly from the supplied buffer.
- chunkWritten = yaffs_WriteChunkDataToObject(in,chunk,buffer,dev->nBytesPerChunk,0);
-#endif
- // Since we've overwritten the cached data, we better invalidate it.
- yaffs_InvalidateChunkCache(in,chunk);
- //T(("Write to chunk %d %d\n",chunk,chunkWritten));
- }
-
- if(chunkWritten >= 0)
- {
- n -= nToCopy;
- offset += nToCopy;
- buffer += nToCopy;
- nDone += nToCopy;
- }
-
- }
-
- // Update file object
-
- if((startOfWrite + nDone) > in->variant.fileVariant.fileSize)
+ dev = dev;
{
- in->variant.fileVariant.fileSize = (startOfWrite + nDone);
+#endif
+ strncpy(name, oh_name, buff_size - 1);
}
-
- in->dirty = 1;
-
- return nDone;
}
-static void yaffs_PruneResizedChunks(yaffs_Object *in, int newSize)
+static void yaffs_load_oh_from_name(struct yaffs_dev *dev, YCHAR *oh_name,
+ const YCHAR *name)
{
+#ifdef CONFIG_YAFFS_AUTO_UNICODE
- yaffs_Device *dev = in->myDev;
- int oldFileSize = in->variant.fileVariant.fileSize;
+ int is_ascii;
+ YCHAR *w;
-
- int lastDel = 1 + (oldFileSize-1)/dev->nBytesPerChunk;
-
- int startDel = 1 + (newSize + dev->nBytesPerChunk - 1)/
- dev->nBytesPerChunk;
- int i;
- int chunkId;
+ if (dev->param.auto_unicode) {
- // 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
-
- chunkId = yaffs_FindAndDeleteChunkInFile(in,i,NULL);
- if(chunkId > 0)
- {
- if(chunkId < (dev->internalStartBlock * dev->nChunksPerBlock) ||
- chunkId >= ((dev->internalEndBlock+1) * dev->nChunksPerBlock))
- {
- T(YAFFS_TRACE_ALWAYS,(TSTR("Found daft chunkId %d for %d"TENDSTR),chunkId,i));
- }
- else
- {
- in->nDataChunks--;
- yaffs_DeleteChunk(dev,chunkId,1,__LINE__);
+ is_ascii = 1;
+ w = name;
+
+ /* Figure out if the name will fit in ascii character set */
+ while (is_ascii && *w) {
+ if ((*w) & 0xff00)
+ is_ascii = 0;
+ w++;
+ }
+
+ if (is_ascii) {
+ /* It is an ASCII name, so convert unicode to ascii */
+ char *ascii_oh_name = (char *)oh_name;
+ int n = YAFFS_MAX_NAME_LENGTH - 1;
+ while (n > 0 && *name) {
+ *ascii_oh_name = *name;
+ name++;
+ ascii_oh_name++;
+ n--;
}
+ } else {
+ /* Unicode name, so save starting at the second YCHAR */
+ *oh_name = 0;
+ strncpy(oh_name + 1, name, YAFFS_MAX_NAME_LENGTH - 2);
}
+ } else {
+#else
+ dev = dev;
+ {
+#endif
+ strncpy(oh_name, name, YAFFS_MAX_NAME_LENGTH - 1);
}
-
}
-int yaffs_ResizeFile(yaffs_Object *in, int newSize)
+/* UpdateObjectHeader updates the header on NAND for an object.
+ * If name is not NULL, then that new name is used.
+ */
+int yaffs_update_oh(struct yaffs_obj *in, const YCHAR *name, int force,
+ int is_shrink, int shadows, struct yaffs_xattr_mod *xmod)
{
- int oldFileSize = in->variant.fileVariant.fileSize;
- int sizeOfPartialChunk;
- yaffs_Device *dev = in->myDev;
-
- sizeOfPartialChunk = newSize % dev->nBytesPerChunk;
-
+ struct yaffs_block_info *bi;
+ struct yaffs_dev *dev = in->my_dev;
+ int prev_chunk_id;
+ int ret_val = 0;
+ int result = 0;
+ int new_chunk_id;
+ struct yaffs_ext_tags new_tags;
+ struct yaffs_ext_tags old_tags;
+ const YCHAR *alias = NULL;
+ u8 *buffer = NULL;
+ YCHAR old_name[YAFFS_MAX_NAME_LENGTH + 1];
+ struct yaffs_obj_hdr *oh = NULL;
+ loff_t file_size = 0;
- yaffs_FlushFilesChunkCache(in);
- yaffs_InvalidateWholeChunkCache(in);
+ strcpy(old_name, _Y("silly old name"));
- yaffs_CheckGarbageCollection(dev);
-
- if(in->variantType != YAFFS_OBJECT_TYPE_FILE)
- {
- return yaffs_GetFileSize(in);
- }
-
- if(newSize == oldFileSize)
- {
- return oldFileSize;
- }
-
- if(newSize < oldFileSize)
- {
+ if (in->fake && in != dev->root_dir && !force && !xmod)
+ return ret_val;
- yaffs_PruneResizedChunks(in,newSize);
-
- if(sizeOfPartialChunk != 0)
- {
- int lastChunk = 1+ newSize/dev->nBytesPerChunk;
- __u8 *localBuffer = yaffs_GetTempBuffer(dev,__LINE__);
-
- // Got to read and rewrite the last chunk with its new size and zero pad
- yaffs_ReadChunkDataFromObject(in,lastChunk,localBuffer);
-
- memset(localBuffer + sizeOfPartialChunk,0, dev->nBytesPerChunk - sizeOfPartialChunk);
-
- yaffs_WriteChunkDataToObject(in,lastChunk,localBuffer,sizeOfPartialChunk,1);
-
- yaffs_ReleaseTempBuffer(dev,localBuffer,__LINE__);
- }
-
- in->variant.fileVariant.fileSize = newSize;
-
- yaffs_PruneFileStructure(dev,&in->variant.fileVariant);
- }
-
- // Write a new object header.
- // show we've shrunk the file, if need be
- // Do this only if the file is not in the deleted directories.
- if(in->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
- in->parent->objectId != YAFFS_OBJECTID_DELETED
- )
- {
- yaffs_UpdateObjectHeader(in,NULL, 0, (newSize < oldFileSize) ? 1 : 0 ,0);
- }
+ yaffs_check_gc(dev, 0);
+ yaffs_check_obj_details_loaded(in);
-
- return newSize;
-}
+ buffer = yaffs_get_temp_buffer(in->my_dev);
+ oh = (struct yaffs_obj_hdr *)buffer;
+ prev_chunk_id = in->hdr_chunk;
-loff_t yaffs_GetFileSize(yaffs_Object *obj)
-{
- obj = yaffs_GetEquivalentObject(obj);
-
- switch(obj->variantType)
- {
- case YAFFS_OBJECT_TYPE_FILE:
- return obj->variant.fileVariant.fileSize;
- case YAFFS_OBJECT_TYPE_SYMLINK:
- return yaffs_strlen(obj->variant.symLinkVariant.alias);
- default:
- return 0;
+ if (prev_chunk_id > 0) {
+ result = yaffs_rd_chunk_tags_nand(dev, prev_chunk_id,
+ buffer, &old_tags);
+
+ yaffs_verify_oh(in, oh, &old_tags, 0);
+ memcpy(old_name, oh->name, sizeof(oh->name));
+ memset(buffer, 0xff, sizeof(struct yaffs_obj_hdr));
+ } else {
+ memset(buffer, 0xff, dev->data_bytes_per_chunk);
}
-}
+ oh->type = in->variant_type;
+ oh->yst_mode = in->yst_mode;
+ oh->shadows_obj = oh->inband_shadowed_obj_id = shadows;
+ yaffs_load_attribs_oh(oh, in);
-// yaffs_FlushFile() updates the file's
-// objectId in NAND
+ if (in->parent)
+ oh->parent_obj_id = in->parent->obj_id;
+ else
+ oh->parent_obj_id = 0;
+
+ if (name && *name) {
+ memset(oh->name, 0, sizeof(oh->name));
+ yaffs_load_oh_from_name(dev, oh->name, name);
+ } else if (prev_chunk_id > 0) {
+ memcpy(oh->name, old_name, sizeof(oh->name));
+ } else {
+ memset(oh->name, 0, sizeof(oh->name));
+ }
+
+ oh->is_shrink = is_shrink;
+
+ switch (in->variant_type) {
+ case YAFFS_OBJECT_TYPE_UNKNOWN:
+ /* Should not happen */
+ break;
+ case YAFFS_OBJECT_TYPE_FILE:
+ if (oh->parent_obj_id != YAFFS_OBJECTID_DELETED &&
+ oh->parent_obj_id != YAFFS_OBJECTID_UNLINKED)
+ file_size = in->variant.file_variant.file_size;
+ yaffs_oh_size_load(oh, file_size);
+ break;
+ case YAFFS_OBJECT_TYPE_HARDLINK:
+ oh->equiv_id = in->variant.hardlink_variant.equiv_id;
+ 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.symlink_variant.alias;
+ if (!alias)
+ alias = _Y("no alias");
+ strncpy(oh->alias, alias, YAFFS_MAX_ALIAS_LENGTH);
+ oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
+ break;
+ }
+
+ /* process any xattrib modifications */
+ if (xmod)
+ yaffs_apply_xattrib_mod(in, (char *)buffer, xmod);
+
+ /* Tags */
+ memset(&new_tags, 0, sizeof(new_tags));
+ in->serial++;
+ new_tags.chunk_id = 0;
+ new_tags.obj_id = in->obj_id;
+ new_tags.serial_number = in->serial;
+
+ /* Add extra info for file header */
+ new_tags.extra_available = 1;
+ new_tags.extra_parent_id = oh->parent_obj_id;
+ new_tags.extra_file_size = file_size;
+ new_tags.extra_is_shrink = oh->is_shrink;
+ new_tags.extra_equiv_id = oh->equiv_id;
+ new_tags.extra_shadows = (oh->shadows_obj > 0) ? 1 : 0;
+ new_tags.extra_obj_type = in->variant_type;
+ yaffs_verify_oh(in, oh, &new_tags, 1);
+
+ /* Create new chunk in NAND */
+ new_chunk_id =
+ yaffs_write_new_chunk(dev, buffer, &new_tags,
+ (prev_chunk_id > 0) ? 1 : 0);
+
+ if (buffer)
+ yaffs_release_temp_buffer(dev, buffer);
+
+ if (new_chunk_id < 0)
+ return new_chunk_id;
+
+ in->hdr_chunk = new_chunk_id;
+
+ if (prev_chunk_id > 0)
+ yaffs_chunk_del(dev, prev_chunk_id, 1, __LINE__);
+
+ if (!yaffs_obj_cache_dirty(in))
+ in->dirty = 0;
+
+ /* If this was a shrink, then mark the block
+ * that the chunk lives on */
+ if (is_shrink) {
+ bi = yaffs_get_block_info(in->my_dev,
+ new_chunk_id /
+ in->my_dev->param.chunks_per_block);
+ bi->has_shrink_hdr = 1;
+ }
+
+
+ return new_chunk_id;
+}
+
+/*--------------------- 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
+ *
+ * Curve-balls: the first chunk might also be the last chunk.
+ */
-int yaffs_FlushFile(yaffs_Object *in, int updateTime)
+int yaffs_file_rd(struct yaffs_obj *in, u8 * buffer, loff_t offset, int n_bytes)
{
- int retVal;
- if(in->dirty)
- {
- //T(("flushing object header\n"));
-
- yaffs_FlushFilesChunkCache(in);
- if(updateTime)
- {
-#ifdef CONFIG_YAFFS_WINCE
- yfsd_WinFileTimeNow(in->win_mtime);
-#else
+ int chunk;
+ u32 start;
+ int n_copy;
+ int n = n_bytes;
+ int n_done = 0;
+ struct yaffs_cache *cache;
+ struct yaffs_dev *dev;
+
+ dev = in->my_dev;
+
+ while (n > 0) {
+ yaffs_addr_to_chunk(dev, offset, &chunk, &start);
+ chunk++;
+
+ /* OK now check for the curveball where the start and end are in
+ * the same chunk.
+ */
+ if ((start + n) < dev->data_bytes_per_chunk)
+ n_copy = n;
+ else
+ n_copy = dev->data_bytes_per_chunk - start;
- in->yst_mtime = Y_CURRENT_TIME;
+ cache = yaffs_find_chunk_cache(in, chunk);
-#endif
- }
+ /* 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 || n_copy != dev->data_bytes_per_chunk ||
+ dev->param.inband_tags) {
+ if (dev->param.n_caches > 0) {
- retVal = (yaffs_UpdateObjectHeader(in,NULL,0,0,0) >= 0)? YAFFS_OK : YAFFS_FAIL;
- }
- else
- {
- retVal = YAFFS_OK;
- }
-
- return retVal;
-
-}
+ /* If we can't find the data in the cache,
+ * then load it up. */
+ if (!cache) {
+ cache =
+ yaffs_grab_chunk_cache(in->my_dev);
+ cache->object = in;
+ cache->chunk_id = chunk;
+ cache->dirty = 0;
+ cache->locked = 0;
+ yaffs_rd_data_obj(in, chunk,
+ cache->data);
+ cache->n_bytes = 0;
+ }
-static int yaffs_DoGenericObjectDeletion(yaffs_Object *in)
-{
+ yaffs_use_cache(dev, cache, 0);
- // First off, invalidate the file's data in the cache, without flushing.
- yaffs_InvalidateWholeChunkCache(in);
+ cache->locked = 1;
- if(in->myDev->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,NULL,0,0);
+ memcpy(buffer, &cache->data[start], n_copy);
- }
+ cache->locked = 0;
+ } else {
+ /* Read into the local buffer then copy.. */
-
- yaffs_RemoveObjectFromDirectory(in);
- yaffs_DeleteChunk(in->myDev,in->chunkId,1,__LINE__);
- in->chunkId = -1;
-#if 0
-#ifdef __KERNEL__
- if(in->myInode)
- {
- in->myInode->u.generic_ip = NULL;
- in->myInode = 0;
- }
-#endif
-#endif
+ u8 *local_buffer =
+ yaffs_get_temp_buffer(dev);
+ yaffs_rd_data_obj(in, chunk, local_buffer);
- yaffs_FreeObject(in);
- return YAFFS_OK;
+ memcpy(buffer, &local_buffer[start], n_copy);
+ yaffs_release_temp_buffer(dev, local_buffer);
+ }
+ } else {
+ /* A full chunk. Read directly into the buffer. */
+ yaffs_rd_data_obj(in, chunk, buffer);
+ }
+ n -= n_copy;
+ offset += n_copy;
+ buffer += n_copy;
+ n_done += n_copy;
+ }
+ return n_done;
}
-// 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_UnlinkFile(yaffs_Object *in)
+int yaffs_do_file_wr(struct yaffs_obj *in, const u8 *buffer, loff_t offset,
+ int n_bytes, int write_through)
{
-#ifdef CONFIG_YAFFS_DISABLE_BACKGROUND_DELETION
+ int chunk;
+ u32 start;
+ int n_copy;
+ int n = n_bytes;
+ int n_done = 0;
+ int n_writeback;
+ loff_t start_write = offset;
+ int chunk_written = 0;
+ u32 n_bytes_read;
+ loff_t chunk_start;
+ struct yaffs_dev *dev;
+
+ dev = in->my_dev;
+
+ while (n > 0 && chunk_written >= 0) {
+ yaffs_addr_to_chunk(dev, offset, &chunk, &start);
+
+ if (((loff_t)chunk) *
+ dev->data_bytes_per_chunk + start != offset ||
+ start >= dev->data_bytes_per_chunk) {
+ yaffs_trace(YAFFS_TRACE_ERROR,
+ "AddrToChunk of offset %lld gives chunk %d start %d",
+ offset, chunk, start);
+ }
+ chunk++; /* File pos to chunk in file offset */
- // Delete the file data & tnodes
+ /* OK now check for the curveball where the start and end are in
+ * the same chunk.
+ */
- yaffs_DeleteWorker(in, in->variant.fileVariant.top, in->variant.fileVariant.topLevel, 0,NULL);
-
+ if ((start + n) < dev->data_bytes_per_chunk) {
+ n_copy = n;
- yaffs_FreeTnode(in->myDev,in->variant.fileVariant.top);
-
- return yaffs_DoGenericObjectDeletion(in);
-#else
- int retVal;
- int immediateDeletion=0;
+ /* Now 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.
+ */
- if(1)
- {
- //in->unlinked = 1;
- //in->myDev->nUnlinkedFiles++;
- //in->renameAllowed = 0;
-#ifdef __KERNEL__
- if(!in->myInode)
- {
- immediateDeletion = 1;
+ chunk_start = (((loff_t)(chunk - 1)) *
+ dev->data_bytes_per_chunk);
- }
-#else
- if(in->inUse <= 0)
- {
- immediateDeletion = 1;
+ if (chunk_start > in->variant.file_variant.file_size)
+ n_bytes_read = 0; /* Past end of file */
+ else
+ n_bytes_read =
+ in->variant.file_variant.file_size -
+ chunk_start;
+
+ if (n_bytes_read > dev->data_bytes_per_chunk)
+ n_bytes_read = dev->data_bytes_per_chunk;
+ n_writeback =
+ (n_bytes_read >
+ (start + n)) ? n_bytes_read : (start + n);
+
+ if (n_writeback < 0 ||
+ n_writeback > dev->data_bytes_per_chunk)
+ BUG();
+
+ } else {
+ n_copy = dev->data_bytes_per_chunk - start;
+ n_writeback = dev->data_bytes_per_chunk;
}
-#endif
- if(immediateDeletion)
- {
- retVal = yaffs_ChangeObjectName(in, in->myDev->deletedDir,NULL,0,0);
- T(YAFFS_TRACE_TRACING,(TSTR("yaffs: immediate deletion of file %d" TENDSTR),in->objectId));
- in->deleted=1;
- in->myDev->nDeletedFiles++;
- if( 0 && in->myDev->isYaffs2)
- {
- yaffs_ResizeFile(in,0);
+
+ if (n_copy != dev->data_bytes_per_chunk ||
+ dev->param.inband_tags) {
+ /* 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.n_caches > 0) {
+ struct yaffs_cache *cache;
+
+ /* If we can't find the data in the cache, then
+ * load the cache */
+ cache = yaffs_find_chunk_cache(in, chunk);
+
+ if (!cache &&
+ yaffs_check_alloc_available(dev, 1)) {
+ cache = yaffs_grab_chunk_cache(dev);
+ cache->object = in;
+ cache->chunk_id = chunk;
+ cache->dirty = 0;
+ cache->locked = 0;
+ yaffs_rd_data_obj(in, chunk,
+ cache->data);
+ } else if (cache &&
+ !cache->dirty &&
+ !yaffs_check_alloc_available(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_use_cache(dev, cache, 1);
+ cache->locked = 1;
+
+ memcpy(&cache->data[start], buffer,
+ n_copy);
+
+ cache->locked = 0;
+ cache->n_bytes = n_writeback;
+
+ if (write_through) {
+ chunk_written =
+ yaffs_wr_data_obj
+ (cache->object,
+ cache->chunk_id,
+ cache->data,
+ cache->n_bytes, 1);
+ cache->dirty = 0;
+ }
+ } else {
+ chunk_written = -1; /* fail write */
+ }
+ } else {
+ /* An incomplete start or end chunk (or maybe
+ * both start and end chunk). Read into the
+ * local buffer then copy over and write back.
+ */
+
+ u8 *local_buffer = yaffs_get_temp_buffer(dev);
+
+ yaffs_rd_data_obj(in, chunk, local_buffer);
+ memcpy(&local_buffer[start], buffer, n_copy);
+
+ chunk_written =
+ yaffs_wr_data_obj(in, chunk,
+ local_buffer,
+ n_writeback, 0);
+
+ yaffs_release_temp_buffer(dev, local_buffer);
}
- yaffs_SoftDeleteFile(in);
+ } else {
+ /* A full chunk. Write directly from the buffer. */
+
+ chunk_written =
+ yaffs_wr_data_obj(in, chunk, buffer,
+ dev->data_bytes_per_chunk, 0);
+
+ /* Since we've overwritten the cached data,
+ * we better invalidate it. */
+ yaffs_invalidate_chunk_cache(in, chunk);
}
- else
- {
- retVal = yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,NULL,0,0);
+
+ if (chunk_written >= 0) {
+ n -= n_copy;
+ offset += n_copy;
+ buffer += n_copy;
+ n_done += n_copy;
}
-
}
- return retVal;
-
-#endif
+ /* Update file object */
+
+ if ((start_write + n_done) > in->variant.file_variant.file_size)
+ in->variant.file_variant.file_size = (start_write + n_done);
+
+ in->dirty = 1;
+ return n_done;
}
-int yaffs_DeleteFile(yaffs_Object *in)
+int yaffs_wr_file(struct yaffs_obj *in, const u8 *buffer, loff_t offset,
+ int n_bytes, int write_through)
{
- int retVal = YAFFS_OK;
-
- if(in->nDataChunks > 0)
- {
- // Use soft deletion
- if(!in->unlinked)
- {
- retVal = yaffs_UnlinkFile(in);
- }
- if(retVal == YAFFS_OK &&
- in->unlinked &&
- !in->deleted)
- {
- in->deleted = 1;
- in->myDev->nDeletedFiles++;
- yaffs_SoftDeleteFile(in);
- }
- return in->deleted ? YAFFS_OK : YAFFS_FAIL;
- }
+ yaffs2_handle_hole(in, offset);
+ return yaffs_do_file_wr(in, buffer, offset, n_bytes, write_through);
+}
+
+/* ---------------------- File resizing stuff ------------------ */
+
+static void yaffs_prune_chunks(struct yaffs_obj *in, loff_t new_size)
+{
+
+ struct yaffs_dev *dev = in->my_dev;
+ loff_t old_size = in->variant.file_variant.file_size;
+ int i;
+ int chunk_id;
+ u32 dummy;
+ int last_del;
+ int start_del;
+
+ if (old_size > 0)
+ yaffs_addr_to_chunk(dev, old_size - 1, &last_del, &dummy);
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;
+ last_del = 0;
+
+ yaffs_addr_to_chunk(dev, new_size + dev->data_bytes_per_chunk - 1,
+ &start_del, &dummy);
+ last_del++;
+ start_del++;
+
+ /* Delete backwards so that we don't end up with holes if
+ * power is lost part-way through the operation.
+ */
+ for (i = last_del; i >= start_del; i--) {
+ /* NB this could be optimised somewhat,
+ * eg. could retrieve the tags and write them without
+ * using yaffs_chunk_del
+ */
+
+ chunk_id = yaffs_find_del_file_chunk(in, i, NULL);
+
+ if (chunk_id < 1)
+ continue;
+
+ if (chunk_id <
+ (dev->internal_start_block * dev->param.chunks_per_block) ||
+ chunk_id >=
+ ((dev->internal_end_block + 1) *
+ dev->param.chunks_per_block)) {
+ yaffs_trace(YAFFS_TRACE_ALWAYS,
+ "Found daft chunk_id %d for %d",
+ chunk_id, i);
+ } else {
+ in->n_data_chunks--;
+ yaffs_chunk_del(dev, chunk_id, 1, __LINE__);
+ }
}
}
-static int yaffs_DeleteDirectory(yaffs_Object *in)
+void yaffs_resize_file_down(struct yaffs_obj *obj, loff_t new_size)
{
- //First check that the directory is empty.
- if(list_empty(&in->variant.directoryVariant.children))
- {
- return yaffs_DoGenericObjectDeletion(in);
+ int new_full;
+ u32 new_partial;
+ struct yaffs_dev *dev = obj->my_dev;
+
+ yaffs_addr_to_chunk(dev, new_size, &new_full, &new_partial);
+
+ yaffs_prune_chunks(obj, new_size);
+
+ if (new_partial != 0) {
+ int last_chunk = 1 + new_full;
+ u8 *local_buffer = yaffs_get_temp_buffer(dev);
+
+ /* Rewrite the last chunk with its new size and zero pad */
+ yaffs_rd_data_obj(obj, last_chunk, local_buffer);
+ memset(local_buffer + new_partial, 0,
+ dev->data_bytes_per_chunk - new_partial);
+
+ yaffs_wr_data_obj(obj, last_chunk, local_buffer,
+ new_partial, 1);
+
+ yaffs_release_temp_buffer(dev, local_buffer);
}
-
- return YAFFS_FAIL;
-
+
+ obj->variant.file_variant.file_size = new_size;
+
+ yaffs_prune_tree(dev, &obj->variant.file_variant);
}
-static int yaffs_DeleteSymLink(yaffs_Object *in)
+int yaffs_resize_file(struct yaffs_obj *in, loff_t new_size)
{
- YFREE(in->variant.symLinkVariant.alias);
+ struct yaffs_dev *dev = in->my_dev;
+ loff_t old_size = in->variant.file_variant.file_size;
+
+ yaffs_flush_file_cache(in);
+ yaffs_invalidate_whole_cache(in);
+
+ yaffs_check_gc(dev, 0);
+
+ if (in->variant_type != YAFFS_OBJECT_TYPE_FILE)
+ return YAFFS_FAIL;
- return yaffs_DoGenericObjectDeletion(in);
+ if (new_size == old_size)
+ return YAFFS_OK;
+
+ if (new_size > old_size) {
+ yaffs2_handle_hole(in, new_size);
+ in->variant.file_variant.file_size = new_size;
+ } else {
+ /* new_size < old_size */
+ yaffs_resize_file_down(in, new_size);
+ }
+
+ /* 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->is_shadowed &&
+ in->parent->obj_id != YAFFS_OBJECTID_UNLINKED &&
+ in->parent->obj_id != YAFFS_OBJECTID_DELETED)
+ yaffs_update_oh(in, NULL, 0, 0, 0, NULL);
+
+ return YAFFS_OK;
}
-static int yaffs_DeleteHardLink(yaffs_Object *in)
+int yaffs_flush_file(struct yaffs_obj *in, int update_time, int data_sync)
{
- // remove this hardlink from the list assocaited with the equivalent
- // object
- list_del(&in->hardLinks);
- return yaffs_DoGenericObjectDeletion(in);
+ if (!in->dirty)
+ return YAFFS_OK;
+
+ yaffs_flush_file_cache(in);
+
+ if (data_sync)
+ return YAFFS_OK;
+
+ if (update_time)
+ yaffs_load_current_time(in, 0, 0);
+
+ return (yaffs_update_oh(in, NULL, 0, 0, 0, NULL) >= 0) ?
+ YAFFS_OK : YAFFS_FAIL;
}
-static void yaffs_DestroyObject(yaffs_Object *obj)
-{
- switch(obj->variantType)
- {
- case YAFFS_OBJECT_TYPE_FILE: yaffs_DeleteFile(obj); break;
- case YAFFS_OBJECT_TYPE_DIRECTORY: yaffs_DeleteDirectory(obj); break;
- case YAFFS_OBJECT_TYPE_SYMLINK: yaffs_DeleteSymLink(obj); break;
- case YAFFS_OBJECT_TYPE_HARDLINK: yaffs_DeleteHardLink(obj); break;
- case YAFFS_OBJECT_TYPE_SPECIAL: yaffs_DoGenericObjectDeletion(obj); break;
- case YAFFS_OBJECT_TYPE_UNKNOWN: break; // should not happen.
+/* yaffs_del_file 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_unlink_file_if_needed(struct yaffs_obj *in)
+{
+ int ret_val;
+ int del_now = 0;
+ struct yaffs_dev *dev = in->my_dev;
+
+ if (!in->my_inode)
+ del_now = 1;
+
+ if (del_now) {
+ ret_val =
+ yaffs_change_obj_name(in, in->my_dev->del_dir,
+ _Y("deleted"), 0, 0);
+ yaffs_trace(YAFFS_TRACE_TRACING,
+ "yaffs: immediate deletion of file %d",
+ in->obj_id);
+ in->deleted = 1;
+ in->my_dev->n_deleted_files++;
+ if (dev->param.disable_soft_del || dev->param.is_yaffs2)
+ yaffs_resize_file(in, 0);
+ yaffs_soft_del_file(in);
+ } else {
+ ret_val =
+ yaffs_change_obj_name(in, in->my_dev->unlinked_dir,
+ _Y("unlinked"), 0, 0);
+ }
+ return ret_val;
+}
+
+static int yaffs_del_file(struct yaffs_obj *in)
+{
+ int ret_val = YAFFS_OK;
+ int deleted; /* Need to cache value on stack if in is freed */
+ struct yaffs_dev *dev = in->my_dev;
+
+ if (dev->param.disable_soft_del || dev->param.is_yaffs2)
+ yaffs_resize_file(in, 0);
+
+ if (in->n_data_chunks > 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)
+ ret_val = yaffs_unlink_file_if_needed(in);
+
+ deleted = in->deleted;
+
+ if (ret_val == YAFFS_OK && in->unlinked && !in->deleted) {
+ in->deleted = 1;
+ deleted = 1;
+ in->my_dev->n_deleted_files++;
+ yaffs_soft_del_file(in);
+ }
+ return deleted ? YAFFS_OK : YAFFS_FAIL;
+ } else {
+ /* The file has no data chunks so we toss it immediately */
+ yaffs_free_tnode(in->my_dev, in->variant.file_variant.top);
+ in->variant.file_variant.top = NULL;
+ yaffs_generic_obj_del(in);
+
+ return YAFFS_OK;
}
}
+int yaffs_is_non_empty_dir(struct yaffs_obj *obj)
+{
+ return (obj &&
+ obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) &&
+ !(list_empty(&obj->variant.dir_variant.children));
+}
-static int yaffs_UnlinkWorker(yaffs_Object *obj)
+static int yaffs_del_dir(struct yaffs_obj *obj)
{
+ /* First check that the directory is empty. */
+ if (yaffs_is_non_empty_dir(obj))
+ return YAFFS_FAIL;
-
- if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
- {
- return yaffs_DeleteHardLink(obj);
- }
- else if(!list_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
- // - Unhook it from its parent directory (so that the rename can work)
- // - Rename the object to the hardlink's name.
- // - Delete the hardlink
-
-
- yaffs_Object *hl;
- int retVal;
- YCHAR name[YAFFS_MAX_NAME_LENGTH+1];
-
- hl = list_entry(obj->hardLinks.next,yaffs_Object,hardLinks);
-
- list_del_init(&hl->hardLinks);
- list_del_init(&hl->siblings);
-
- yaffs_GetObjectName(hl,name,YAFFS_MAX_NAME_LENGTH+1);
-
- retVal = yaffs_ChangeObjectName(obj, hl->parent, name,0,0);
-
- if(retVal == YAFFS_OK)
- {
- retVal = yaffs_DoGenericObjectDeletion(hl);
- }
- return retVal;
-
- }
- else
- {
- switch(obj->variantType)
- {
- case YAFFS_OBJECT_TYPE_FILE:
- return yaffs_UnlinkFile(obj);
- break;
- case YAFFS_OBJECT_TYPE_DIRECTORY:
- return yaffs_DeleteDirectory(obj);
- break;
- case YAFFS_OBJECT_TYPE_SYMLINK:
- return yaffs_DeleteSymLink(obj);
- break;
- case YAFFS_OBJECT_TYPE_SPECIAL:
- return yaffs_DoGenericObjectDeletion(obj);
- break;
- case YAFFS_OBJECT_TYPE_HARDLINK:
- case YAFFS_OBJECT_TYPE_UNKNOWN:
- default:
- return YAFFS_FAIL;
- }
- }
+ return yaffs_generic_obj_del(obj);
}
-int yaffs_Unlink(yaffs_Object *dir, const YCHAR *name)
+static int yaffs_del_symlink(struct yaffs_obj *in)
{
- yaffs_Object *obj;
-
- obj = yaffs_FindObjectByName(dir,name);
-
- if(obj && obj->unlinkAllowed)
- {
- return yaffs_UnlinkWorker(obj);
- }
-
- return YAFFS_FAIL;
-
-}
+ kfree(in->variant.symlink_variant.alias);
+ in->variant.symlink_variant.alias = NULL;
-//////////////// Initialisation Scanning /////////////////
+ return yaffs_generic_obj_del(in);
+}
+static int yaffs_del_link(struct yaffs_obj *in)
+{
+ /* remove this hardlink from the list associated with the equivalent
+ * object
+ */
+ list_del_init(&in->hard_links);
+ return yaffs_generic_obj_del(in);
+}
-static void yaffs_HandleShadowedObject(yaffs_Device *dev, int objId, int backwardScanning)
+int yaffs_del_obj(struct yaffs_obj *obj)
{
- yaffs_Object *obj;
-
- if(!backwardScanning)
- {
- // Handle YAFFS1 forward scanning case
- // For YAFFS1 we always do the deletion
-
- }
- else
- { // Handle YAFFS2 case (backward scanning)
- // If the shadowed object exists then ignore.
- if(yaffs_FindObjectByNumber(dev,objId))
- {
- return;
- }
- }
-
- // Let's create it (if it does not exist) assuming it is a file so that it can do shrinking etc.
- // We put it in unlinked dir to be cleaned up after the scanning
- obj = yaffs_FindOrCreateObjectByNumber(dev,objId,YAFFS_OBJECT_TYPE_FILE);
- yaffs_AddObjectToDirectory(dev->unlinkedDir,obj);
- obj->variant.fileVariant.shrinkSize = 0;
- obj->valid = 1; // So that we don't read any other infor for this file
-
-}
-
-#if 0
-// For now we use the SmartMedia check.
-// We look at the blockStatus byte in the first two chunks
-// These must be 0xFF to pass as OK.
-// todo: this function needs to be modifyable foir different NAND types
-// and different chunk sizes. Suggest make this into a per-device configurable
-// function.
-static int yaffs_IsBlockBad(yaffs_Device *dev, int blk)
-{
- yaffsExtendedTags *tags;
-
- yaffs_ReadChunkFromNAND(dev,blk * dev->nChunksPerBlock,NULL,&tags,1);
-#if 1
- if(yaffs_CountBits(spare.blockStatus) < 7)
- {
- return 1;
- }
-#else
- if(spare.blockStatus != 0xFF)
- {
- return 1;
- }
-#endif
- yaffs_ReadChunkFromNAND(dev,blk * dev->nChunksPerBlock + 1,NULL,&spare,1);
+ int ret_val = -1;
-#if 1
- if(yaffs_CountBits(spare.blockStatus) < 7)
- {
- return 1;
- }
-#else
- if(spare.blockStatus != 0xFF)
- {
- return 1;
+ switch (obj->variant_type) {
+ case YAFFS_OBJECT_TYPE_FILE:
+ ret_val = yaffs_del_file(obj);
+ break;
+ case YAFFS_OBJECT_TYPE_DIRECTORY:
+ if (!list_empty(&obj->variant.dir_variant.dirty)) {
+ yaffs_trace(YAFFS_TRACE_BACKGROUND,
+ "Remove object %d from dirty directories",
+ obj->obj_id);
+ list_del_init(&obj->variant.dir_variant.dirty);
+ }
+ return yaffs_del_dir(obj);
+ break;
+ case YAFFS_OBJECT_TYPE_SYMLINK:
+ ret_val = yaffs_del_symlink(obj);
+ break;
+ case YAFFS_OBJECT_TYPE_HARDLINK:
+ ret_val = yaffs_del_link(obj);
+ break;
+ case YAFFS_OBJECT_TYPE_SPECIAL:
+ ret_val = yaffs_generic_obj_del(obj);
+ break;
+ case YAFFS_OBJECT_TYPE_UNKNOWN:
+ ret_val = 0;
+ break; /* should not happen. */
}
-#endif
-
- return 0;
-
+ return ret_val;
}
-#endif
+static int yaffs_unlink_worker(struct yaffs_obj *obj)
+{
+ int del_now = 0;
+ if (!obj)
+ return YAFFS_FAIL;
-typedef struct
-{
- int seq;
- int block;
-} yaffs_BlockIndex;
+ if (!obj->my_inode)
+ del_now = 1;
+ yaffs_update_parent(obj->parent);
+ if (obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) {
+ return yaffs_del_link(obj);
+ } else if (!list_empty(&obj->hard_links)) {
+ /* 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
+ * - Move it from its parent directory so that the rename works.
+ * - Rename the object to the hardlink's name.
+ * - Delete the hardlink
+ */
-static int yaffs_Scan(yaffs_Device *dev)
-{
- yaffs_ExtendedTags tags;
- int blk;
- int blockIterator;
- int startIterator;
- int endIterator;
- int nBlocksToScan = 0;
-
- int chunk;
- int c;
- int deleted;
- yaffs_BlockState state;
- yaffs_Object *hardList = NULL;
- yaffs_Object *hl;
- yaffs_BlockInfo *bi;
- int sequenceNumber;
- yaffs_ObjectHeader *oh;
- yaffs_Object *in;
- yaffs_Object *parent;
- int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
-
- __u8 *chunkData;
-
- yaffs_BlockIndex *blockIndex = NULL;
-
- T(YAFFS_TRACE_SCAN,(TSTR("yaffs_Scan starts intstartblk %d intendblk %d..." TENDSTR),dev->internalStartBlock,dev->internalEndBlock));
-
- chunkData = yaffs_GetTempBuffer(dev,__LINE__);
-
-
- dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
-
- if(dev->isYaffs2)
- {
- blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
- }
-
-
- // Scan all the blocks to determine their state
- for(blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++)
- {
- bi = yaffs_GetBlockInfo(dev,blk);
- yaffs_ClearChunkBits(dev,blk);
- bi->pagesInUse = 0;
- bi->softDeletions = 0;
-
- yaffs_QueryInitialBlockState(dev,blk,&state,&sequenceNumber);
-
- bi->blockState = state;
- bi->sequenceNumber = sequenceNumber;
-
- T(YAFFS_TRACE_SCAN_DEBUG,(TSTR("Block scanning block %d state %d seq %d" TENDSTR),blk,state,sequenceNumber));
-
- if(state == YAFFS_BLOCK_STATE_DEAD)
- {
- T(YAFFS_TRACE_BAD_BLOCKS,(TSTR("block %d is bad" TENDSTR),blk));
- }
- else if(state == YAFFS_BLOCK_STATE_EMPTY)
- {
- T(YAFFS_TRACE_SCAN_DEBUG,(TSTR("Block empty " TENDSTR)));
- dev->nErasedBlocks++;
- dev->nFreeChunks += dev->nChunksPerBlock;
- }
- else if(state == YAFFS_BLOCK_STATE_NEEDS_SCANNING)
- {
-
- // Determine the highest sequence number
- if( dev->isYaffs2 &&
- sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
- sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER)
- {
-
- blockIndex[nBlocksToScan].seq = sequenceNumber;
- blockIndex[nBlocksToScan].block = blk;
-
- nBlocksToScan++;
-
- if(sequenceNumber >= dev->sequenceNumber)
- {
- dev->sequenceNumber = sequenceNumber;
- }
- }
- else if(dev->isYaffs2)
- {
- // TODO: Nasty sequence number!
- T(YAFFS_TRACE_SCAN,(TSTR("Block scanning block %d has bad sequence number %d" TENDSTR),blk,sequenceNumber));
+ struct yaffs_obj *hl;
+ struct yaffs_obj *parent;
+ int ret_val;
+ YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
- }
- }
- }
-
- // Sort the blocks
- // Dungy old bubble sort for now...
- if(dev->isYaffs2)
- {
- yaffs_BlockIndex temp;
- int i;
- int j;
-
- for(i = 0; i < nBlocksToScan; i++)
- for(j = i+1; j < nBlocksToScan; j++)
- if(blockIndex[i].seq > blockIndex[j].seq)
- {
- temp = blockIndex[j];
- blockIndex[j] = blockIndex[i];
- blockIndex[i] = temp;
- }
- }
-
-
- // Now scan the blocks looking at the data.
- if(dev->isYaffs2)
- {
- startIterator = 0;
- endIterator = nBlocksToScan-1;
- T(YAFFS_TRACE_SCAN_DEBUG,(TSTR("%d blocks to be scanned" TENDSTR),nBlocksToScan));
- }
- else
- {
- startIterator = dev->internalStartBlock;
- endIterator = dev->internalEndBlock;
- }
-
- // For each block....
- for(blockIterator = startIterator; blockIterator <= endIterator; blockIterator++)
- {
-
- if(dev->isYaffs2)
- {
- // get the block to scan in the correct order
- blk = blockIndex[blockIterator].block;
- }
- else
- {
- blk = blockIterator;
- }
+ hl = list_entry(obj->hard_links.next, struct yaffs_obj,
+ hard_links);
+ yaffs_get_obj_name(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
+ parent = hl->parent;
- bi = yaffs_GetBlockInfo(dev,blk);
- state = bi->blockState;
-
- deleted = 0;
-
- // For each chunk in each block that needs scanning....
- for(c = 0; c < dev->nChunksPerBlock &&
- state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++)
- {
- // Read the tags and decide what to do
- chunk = blk * dev->nChunksPerBlock + c;
-
- yaffs_ReadChunkWithTagsFromNAND(dev,chunk,NULL,&tags);
-
- // Let's have a good look at this chunk...
-
-
- if(!dev->isYaffs2 && tags.chunkDeleted)
- {
- // YAFFS1 only...
- // A deleted chunk
- deleted++;
- dev->nFreeChunks ++;
- //T((" %d %d deleted\n",blk,c));
- }
- else if(!tags.chunkUsed)
- {
- // An unassigned chunk in the block
- // This means that either the block is empty or
- // this is the one being allocated from
-
- if(c == 0)
- {
- // We're looking at the first chunk in the block so the block is unused
- state = YAFFS_BLOCK_STATE_EMPTY;
- dev->nErasedBlocks++;
- }
- else
- {
- // this is the block being allocated from
- T(YAFFS_TRACE_SCAN,(TSTR(" Allocating from %d %d" TENDSTR),blk,c));
- state = YAFFS_BLOCK_STATE_ALLOCATING;
- dev->allocationBlock = blk;
- dev->allocationPage = c;
- dev->allocationBlockFinder = blk; // Set it to here to encourage the allocator to
- // go forth from here.
- //Yaffs2 sanity check:
- // This should be the one with the highest sequence number
- if(dev->isYaffs2 && (dev->sequenceNumber != bi->sequenceNumber))
- {
- T(YAFFS_TRACE_ALWAYS,
- (TSTR("yaffs: Allocation block %d was not highest sequence id: block seq = %d, dev seq = %d" TENDSTR),
- blk,bi->sequenceNumber,dev->sequenceNumber));
- }
- }
+ list_del_init(&hl->hard_links);
- dev->nFreeChunks += (dev->nChunksPerBlock - c);
- }
- else if(tags.chunkId > 0)
- {
- // chunkId > 0 so it is a data chunk...
- unsigned int endpos;
-
- yaffs_SetChunkBit(dev,blk,c);
- bi->pagesInUse++;
-
- in = yaffs_FindOrCreateObjectByNumber(dev,tags.objectId,YAFFS_OBJECT_TYPE_FILE);
- // PutChunkIntoFile checks for a clash (two data chunks with
- // the same chunkId).
- yaffs_PutChunkIntoFile(in,tags.chunkId,chunk,1);
- endpos = (tags.chunkId - 1)* dev->nBytesPerChunk + tags.byteCount;
- if(in->variantType == YAFFS_OBJECT_TYPE_FILE && in->variant.fileVariant.scannedFileSize <endpos)
- {
- in->variant.fileVariant.scannedFileSize = endpos;
- if(!dev->useHeaderFileSize)
- {
- in->variant.fileVariant.fileSize = in->variant.fileVariant.scannedFileSize;
- }
+ yaffs_add_obj_to_dir(obj->my_dev->unlinked_dir, hl);
- }
- //T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId));
- }
- else
- {
- // chunkId == 0, so it is an ObjectHeader.
- // Thus, we read in the object header and make the object
- yaffs_SetChunkBit(dev,blk,c);
- bi->pagesInUse++;
-
- yaffs_ReadChunkWithTagsFromNAND(dev,chunk,chunkData,NULL);
-
- oh = (yaffs_ObjectHeader *)chunkData;
-
- in = yaffs_FindObjectByNumber(dev,tags.objectId);
- if(in && in->variantType != oh->type)
- {
- // This should not happen, but somehow
- // Wev'e ended up with an objectId that has been reused but not yet
- // deleted, and worse still it has changed type. Delete the old object.
-
- yaffs_DestroyObject(in);
-
- in = 0;
- }
-
- in = yaffs_FindOrCreateObjectByNumber(dev,tags.objectId,oh->type);
-
- if(oh->shadowsObject > 0)
- {
- yaffs_HandleShadowedObject(dev,oh->shadowsObject,0);
- }
-
- if(in->valid)
- {
- // We have already filled this one. We have a duplicate and need to resolve it.
-
- unsigned existingSerial = in->serial;
- unsigned newSerial = tags.serialNumber;
-
- if( dev->isYaffs2 ||
- ((existingSerial+1) & 3) == newSerial)
- {
- // Use new one - destroy the exisiting one
- yaffs_DeleteChunk(dev,in->chunkId,1,__LINE__);
- in->valid = 0;
- }
- else
- {
- // Use existing - destroy this one.
- yaffs_DeleteChunk(dev,chunk,1,__LINE__);
- }
- }
-
- if(!in->valid &&
- (tags.objectId == YAFFS_OBJECTID_ROOT ||
- tags.objectId == YAFFS_OBJECTID_LOSTNFOUND))
- {
- // We only load some info, don't fiddle with directory structure
- in->valid = 1;
- in->variantType = oh->type;
-
- in->yst_mode = oh->yst_mode;
-#ifdef CONFIG_YAFFS_WINCE
- in->win_atime[0] = oh->win_atime[0];
- in->win_ctime[0] = oh->win_ctime[0];
- in->win_mtime[0] = oh->win_mtime[0];
- in->win_atime[1] = oh->win_atime[1];
- in->win_ctime[1] = oh->win_ctime[1];
- in->win_mtime[1] = oh->win_mtime[1];
-#else
- in->yst_uid = oh->yst_uid;
- in->yst_gid = oh->yst_gid;
- in->yst_atime = oh->yst_atime;
- in->yst_mtime = oh->yst_mtime;
- in->yst_ctime = oh->yst_ctime;
- in->yst_rdev = oh->yst_rdev;
-#endif
- in->chunkId = chunk;
+ ret_val = yaffs_change_obj_name(obj, parent, name, 0, 0);
- }
- else if(!in->valid)
- {
- // we need to load this info
-
- in->valid = 1;
- in->variantType = oh->type;
-
- in->yst_mode = oh->yst_mode;
-#ifdef CONFIG_YAFFS_WINCE
- in->win_atime[0] = oh->win_atime[0];
- in->win_ctime[0] = oh->win_ctime[0];
- in->win_mtime[0] = oh->win_mtime[0];
- in->win_atime[1] = oh->win_atime[1];
- in->win_ctime[1] = oh->win_ctime[1];
- in->win_mtime[1] = oh->win_mtime[1];
-#else
- in->yst_uid = oh->yst_uid;
- in->yst_gid = oh->yst_gid;
- in->yst_atime = oh->yst_atime;
- in->yst_mtime = oh->yst_mtime;
- in->yst_ctime = oh->yst_ctime;
- in->yst_rdev = oh->yst_rdev;
-#endif
- in->chunkId = chunk;
-
- yaffs_SetObjectName(in,oh->name);
- in->dirty = 0;
-
- // directory stuff...
- // hook up to parent
-
- parent = yaffs_FindOrCreateObjectByNumber(dev,oh->parentObjectId,YAFFS_OBJECT_TYPE_DIRECTORY);
- if(parent->variantType == YAFFS_OBJECT_TYPE_UNKNOWN)
- {
- // Set up as a directory
- parent->variantType = YAFFS_OBJECT_TYPE_DIRECTORY;
- INIT_LIST_HEAD(&parent->variant.directoryVariant.children);
- }
- else if(parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
- {
- // Hoosterman, another problem....
- // We're trying to use a non-directory as a directory
+ if (ret_val == YAFFS_OK)
+ ret_val = yaffs_generic_obj_del(hl);
- T(YAFFS_TRACE_ERROR, (TSTR("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found." TENDSTR)));
- parent = dev->lostNFoundDir;
- }
-
- yaffs_AddObjectToDirectory(parent,in);
-
- if(0 && (parent == dev->deletedDir ||
- parent == dev->unlinkedDir))
- {
- in->deleted = 1; // If it is unlinked at start up then it wants deleting
- dev->nDeletedFiles++;
- }
-
- // Note re hardlinks.
- // Since we might scan a hardlink before its equivalent object is scanned
- // we put them all in a list.
- // After scanning is complete, we should have all the objects, so we run through this
- // list and fix up all the chains.
-
- switch(in->variantType)
- {
- case YAFFS_OBJECT_TYPE_UNKNOWN: // Todo got a problem
- break;
- case YAFFS_OBJECT_TYPE_FILE:
- if(dev->isYaffs2 && oh->isShrink)
- {
- // Prune back the shrunken chunks
- yaffs_PruneResizedChunks(in,oh->fileSize);
- // Mark the block as having a shrinkHeader
- bi->hasShrinkHeader = 1;
- }
-
- if(dev->useHeaderFileSize)
-
- in->variant.fileVariant.fileSize = oh->fileSize;
-
- break;
- case YAFFS_OBJECT_TYPE_HARDLINK:
- in->variant.hardLinkVariant.equivalentObjectId = oh->equivalentObjectId;
- in->hardLinks.next = (struct list_head *)hardList;
- hardList = in;
- break;
- case YAFFS_OBJECT_TYPE_DIRECTORY: // Do nothing
- break;
- case YAFFS_OBJECT_TYPE_SPECIAL: // Do nothing
- break;
- case YAFFS_OBJECT_TYPE_SYMLINK: // Do nothing
- in->variant.symLinkVariant.alias = yaffs_CloneString(oh->alias);
- break;
- }
+ return ret_val;
- if(parent == dev->deletedDir)
- {
- yaffs_DestroyObject(in);
- bi->hasShrinkHeader = 1;
- }
- //T((" %d %d header %d \"%s\" type %d\n",blk,c,tags.objectId,oh->name,in->variantType));
- }
- }
- }
-
- if(state == YAFFS_BLOCK_STATE_NEEDS_SCANNING)
- {
- // If we got this far while scanning, then the block is fully allocated.
- state = YAFFS_BLOCK_STATE_FULL;
- }
-
- bi->blockState = state;
-
- // Now let's see if it was dirty
- if( bi->pagesInUse == 0 &&
- !bi->hasShrinkHeader &&
- bi->blockState == YAFFS_BLOCK_STATE_FULL)
- {
- yaffs_BlockBecameDirty(dev,blk);
- }
-
- }
-
- if(blockIndex)
- {
- YFREE(blockIndex);
- }
-
- // Ok, we've done all the scanning.
-
- // Fix up the hard link chains.
- // We should now have scanned all the objects, now it's time to add these
- // hardlinks.
- while(hardList)
- {
- hl = hardList;
- hardList = (yaffs_Object *)(hardList->hardLinks.next);
-
- in = yaffs_FindObjectByNumber(dev,hl->variant.hardLinkVariant.equivalentObjectId);
-
- if(in)
- {
- // Add the hardlink pointers
- hl->variant.hardLinkVariant.equivalentObject=in;
- list_add(&hl->hardLinks,&in->hardLinks);
- }
- else
- {
- //Todo Need to report/handle this better.
- // Got a problem... hardlink to a non-existant object
- hl->variant.hardLinkVariant.equivalentObject=NULL;
- INIT_LIST_HEAD(&hl->hardLinks);
-
+ } else if (del_now) {
+ switch (obj->variant_type) {
+ case YAFFS_OBJECT_TYPE_FILE:
+ return yaffs_del_file(obj);
+ break;
+ case YAFFS_OBJECT_TYPE_DIRECTORY:
+ list_del_init(&obj->variant.dir_variant.dirty);
+ return yaffs_del_dir(obj);
+ break;
+ case YAFFS_OBJECT_TYPE_SYMLINK:
+ return yaffs_del_symlink(obj);
+ break;
+ case YAFFS_OBJECT_TYPE_SPECIAL:
+ return yaffs_generic_obj_del(obj);
+ break;
+ case YAFFS_OBJECT_TYPE_HARDLINK:
+ case YAFFS_OBJECT_TYPE_UNKNOWN:
+ default:
+ return YAFFS_FAIL;
}
-
- }
-
- // Handle the unlinked files. Since they were left in an unlinked state we should
- // just delete them.
- {
- struct list_head *i;
- struct list_head *n;
-
- yaffs_Object *l;
- // Soft delete all the unlinked files
- list_for_each_safe(i,n,&dev->unlinkedDir->variant.directoryVariant.children)
- {
- if(i)
- {
- l = list_entry(i, yaffs_Object,siblings);
- yaffs_DestroyObject(l);
- }
- }
+ } else if (yaffs_is_non_empty_dir(obj)) {
+ return YAFFS_FAIL;
+ } else {
+ return yaffs_change_obj_name(obj, obj->my_dev->unlinked_dir,
+ _Y("unlinked"), 0, 0);
}
-
- yaffs_ReleaseTempBuffer(dev,chunkData,__LINE__);
+}
- T(YAFFS_TRACE_SCAN,(TSTR("yaffs_Scan ends" TENDSTR)));
+static int yaffs_unlink_obj(struct yaffs_obj *obj)
+{
+ if (obj && obj->unlink_allowed)
+ return yaffs_unlink_worker(obj);
- return YAFFS_OK;
+ return YAFFS_FAIL;
}
+int yaffs_unlinker(struct yaffs_obj *dir, const YCHAR *name)
+{
+ struct yaffs_obj *obj;
-static int yaffs_ScanBackwards(yaffs_Device *dev)
+ obj = yaffs_find_by_name(dir, name);
+ return yaffs_unlink_obj(obj);
+}
+
+/* Note:
+ * If old_name is NULL then we take old_dir as the object to be renamed.
+ */
+int yaffs_rename_obj(struct yaffs_obj *old_dir, const YCHAR *old_name,
+ struct yaffs_obj *new_dir, const YCHAR *new_name)
{
- yaffs_ExtendedTags tags;
- int blk;
- int blockIterator;
- int startIterator;
- int endIterator;
- int nBlocksToScan = 0;
-
- int chunk;
- int c;
- int deleted;
- yaffs_BlockState state;
- yaffs_Object *hardList = NULL;
- yaffs_Object *hl;
- yaffs_BlockInfo *bi;
- int sequenceNumber;
- yaffs_ObjectHeader *oh;
- yaffs_Object *in;
- yaffs_Object *parent;
- int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
-
- __u8 *chunkData;
-
- yaffs_BlockIndex *blockIndex = NULL;
-
-
- if(!dev->isYaffs2)
- {
- T(YAFFS_TRACE_SCAN,(TSTR("yaffs_ScanBackwards is only for YAFFS2!" TENDSTR)));
+ struct yaffs_obj *obj = NULL;
+ struct yaffs_obj *existing_target = NULL;
+ int force = 0;
+ int result;
+ struct yaffs_dev *dev;
+
+ if (!old_dir || old_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
+ BUG();
return YAFFS_FAIL;
}
-
- T(YAFFS_TRACE_SCAN,(TSTR("yaffs_ScanBackwards starts intstartblk %d intendblk %d..." TENDSTR),dev->internalStartBlock,dev->internalEndBlock));
-
- chunkData = yaffs_GetTempBuffer(dev,__LINE__);
-
-
- dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
-
- blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
-
-
- // Scan all the blocks to determine their state
- for(blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++)
- {
- bi = yaffs_GetBlockInfo(dev,blk);
- yaffs_ClearChunkBits(dev,blk);
- bi->pagesInUse = 0;
- bi->softDeletions = 0;
-
- yaffs_QueryInitialBlockState(dev,blk,&state,&sequenceNumber);
-
- bi->blockState = state;
- bi->sequenceNumber = sequenceNumber;
-
- T(YAFFS_TRACE_SCAN_DEBUG,(TSTR("Block scanning block %d state %d seq %d" TENDSTR),blk,state,sequenceNumber));
-
- if(state == YAFFS_BLOCK_STATE_DEAD)
- {
- T(YAFFS_TRACE_BAD_BLOCKS,(TSTR("block %d is bad" TENDSTR),blk));
- }
- else if(state == YAFFS_BLOCK_STATE_EMPTY)
- {
- T(YAFFS_TRACE_SCAN_DEBUG,(TSTR("Block empty " TENDSTR)));
- dev->nErasedBlocks++;
- dev->nFreeChunks += dev->nChunksPerBlock;
- }
- else if(state == YAFFS_BLOCK_STATE_NEEDS_SCANNING)
- {
-
- // Determine the highest sequence number
- if( dev->isYaffs2 &&
- sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
- sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER)
- {
-
- blockIndex[nBlocksToScan].seq = sequenceNumber;
- blockIndex[nBlocksToScan].block = blk;
-
- nBlocksToScan++;
-
- if(sequenceNumber >= dev->sequenceNumber)
- {
- dev->sequenceNumber = sequenceNumber;
- }
- }
- else if(dev->isYaffs2)
- {
- // TODO: Nasty sequence number!
- T(YAFFS_TRACE_SCAN,(TSTR("Block scanning block %d has bad sequence number %d" TENDSTR),blk,sequenceNumber));
-
- }
- }
+ if (!new_dir || new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
+ BUG();
+ return YAFFS_FAIL;
}
-
- // Sort the blocks
- // Dungy old bubble sort for now...
- {
- yaffs_BlockIndex temp;
- int i;
- int j;
-
- for(i = 0; i < nBlocksToScan; i++)
- for(j = i+1; j < nBlocksToScan; j++)
- if(blockIndex[i].seq > blockIndex[j].seq)
- {
- temp = blockIndex[j];
- blockIndex[j] = blockIndex[i];
- blockIndex[i] = temp;
- }
- }
-
-
- // Now scan the blocks looking at the data.
- startIterator = 0;
- endIterator = nBlocksToScan-1;
- T(YAFFS_TRACE_SCAN_DEBUG,(TSTR("%d blocks to be scanned" TENDSTR),nBlocksToScan));
-
-
- // For each block.... backwards
- for(blockIterator = endIterator; blockIterator >= startIterator; blockIterator--)
- {
-
- // get the block to scan in the correct order
- blk = blockIndex[blockIterator].block;
-
-
- bi = yaffs_GetBlockInfo(dev,blk);
- state = bi->blockState;
-
- deleted = 0;
-
- if( 0 && // Disable since this is redundant.
- state == YAFFS_BLOCK_STATE_NEEDS_SCANNING)
- {
- // Let's look at the first chunk in the block
- chunk = blk * dev->nChunksPerBlock;
-
- yaffs_ReadChunkWithTagsFromNAND(dev,chunk,NULL,&tags);
-
- // Let's have a good look at this chunk...
-
- if(!tags.chunkUsed)
- {
- // An unassigned chunk in the block
- // This means that either the block is empty or
- // this is the one being allocated from
-
- // We're looking at the first chunk in the block so the block is unused
- state = YAFFS_BLOCK_STATE_EMPTY;
- dev->nErasedBlocks++;
- dev->nFreeChunks += dev->nChunksPerBlock;
- }
-
- }
-
- // For each chunk in each block that needs scanning....
- for(c = dev->nChunksPerBlock-1; c >= 0 &&
- (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
- state == YAFFS_BLOCK_STATE_ALLOCATING); c--)
- {
- // Scan backwards...
- // Read the tags and decide what to do
- chunk = blk * dev->nChunksPerBlock + c;
-
- yaffs_ReadChunkWithTagsFromNAND(dev,chunk,NULL,&tags);
-
- // Let's have a good look at this chunk...
-
- if(!tags.chunkUsed)
- {
- // An unassigned chunk in the block
- // This means that either the block is empty or
- // this is the one being allocated from
-
- if(c == 0)
- {
- // We're looking at the first chunk in the block so the block is unused
- state = YAFFS_BLOCK_STATE_EMPTY;
- dev->nErasedBlocks++;
- }
- else
- {
- // this is the block being allocated from
- if(state == YAFFS_BLOCK_STATE_NEEDS_SCANNING)
- {
- T(YAFFS_TRACE_SCAN,(TSTR(" Allocating from %d %d" TENDSTR),blk,c));
- }
- state = YAFFS_BLOCK_STATE_ALLOCATING;
- dev->allocationBlock = blk;
- dev->allocationPage = c;
- dev->allocationBlockFinder = blk; // Set it to here to encourage the allocator to
- // go forth from here.
- //Yaffs2 sanity check:
- // This should be the one with the highest sequence number
- if(dev->isYaffs2 && (dev->sequenceNumber != bi->sequenceNumber))
- {
- T(YAFFS_TRACE_ALWAYS,
- (TSTR("yaffs: Allocation block %d was not highest sequence id: block seq = %d, dev seq = %d" TENDSTR),
- blk,bi->sequenceNumber,dev->sequenceNumber));
- }
- }
- dev->nFreeChunks ++;
- }
- else if(tags.chunkId > 0)
- {
- // chunkId > 0 so it is a data chunk...
- unsigned int endpos;
-
- __u32 chunkBase = (tags.chunkId - 1)* dev->nBytesPerChunk;
-
- yaffs_SetChunkBit(dev,blk,c);
- bi->pagesInUse++;
-
- in = yaffs_FindOrCreateObjectByNumber(dev,tags.objectId,YAFFS_OBJECT_TYPE_FILE);
- if(in->variantType == YAFFS_OBJECT_TYPE_FILE &&
- chunkBase < in->variant.fileVariant.shrinkSize)
- {
- // This has not been invalidated by a resize
- yaffs_PutChunkIntoFile(in,tags.chunkId,chunk,-1);
-
-
- // File size is calculated by looking at the data chunks if we have not
- // seen an object header yet. Stop this practice once we find an object header.
- endpos = (tags.chunkId - 1)* dev->nBytesPerChunk + tags.byteCount;
- if(!in->valid && // have not got an object header yet
- in->variant.fileVariant.scannedFileSize <endpos)
- {
- in->variant.fileVariant.scannedFileSize = endpos;
- in->variant.fileVariant.fileSize = in->variant.fileVariant.scannedFileSize;
- }
+ dev = old_dir->my_dev;
- }
- else
- {
- // This chunk has been invalidated by a resize, so delete
- yaffs_DeleteChunk(dev,chunk,1,__LINE__);
-
-
- }
- //T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId));
- }
- else
- {
- // chunkId == 0, so it is an ObjectHeader.
- // Thus, we read in the object header and make the object
- yaffs_SetChunkBit(dev,blk,c);
- bi->pagesInUse++;
-
- oh = NULL;
- in = NULL;
-
- if(tags.extraHeaderInfoAvailable)
- {
- in = yaffs_FindOrCreateObjectByNumber(dev,tags.objectId,tags.extraObjectType);
- }
-
-
- if(!in || !in->valid)
- {
-
- // If we don't have valid info then we need to read the chunk
- // TODO In future we can probably defer reading the chunk and
- // living with invalid data until needed.
-
- yaffs_ReadChunkWithTagsFromNAND(dev,chunk,chunkData,NULL);
-
- oh = (yaffs_ObjectHeader *)chunkData;
-
- if(!in)
- in = yaffs_FindOrCreateObjectByNumber(dev,tags.objectId,oh->type);
-
- }
-
- if(!in)
- {
- // TODO Hoosterman we have a problem!
- T(YAFFS_TRACE_ERROR, (TSTR("yaffs tragedy: Could not make object for object %d at chunk %d during scan" TENDSTR),tags.objectId,chunk));
-
- }
-
- if(in->valid)
- {
- // We have already filled this one. We have a duplicate that will be discarded, but
- // we first have to suck out resize info if it is a file.
-
- if( (in->variantType == YAFFS_OBJECT_TYPE_FILE) &&
- ((oh && oh->type == YAFFS_OBJECT_TYPE_FILE) ||
- (tags.extraHeaderInfoAvailable && tags.extraObjectType == YAFFS_OBJECT_TYPE_FILE))
- )
- {
- __u32 thisSize = (oh) ? oh->fileSize : tags.extraFileLength;
- __u32 parentObjectId = (oh) ? oh->parentObjectId : tags.extraParentObjectId;
- unsigned isShrink = (oh) ? oh->isShrink : tags.extraIsShrinkHeader;
-
- // If it is deleted (unlinked at start also means deleted)
- // we treat the file size as being zeroed at this point.
- if(parentObjectId == YAFFS_OBJECTID_DELETED ||
- parentObjectId == YAFFS_OBJECTID_UNLINKED)
- {
- thisSize = 0;
- isShrink = 1;
- }
-
- if(isShrink &&
- in->variant.fileVariant.shrinkSize > thisSize)
- {
- in->variant.fileVariant.shrinkSize = thisSize;
- }
-
- if(isShrink)
- {
- bi->hasShrinkHeader = 1;
- }
-
- }
- // Use existing - destroy this one.
- yaffs_DeleteChunk(dev,chunk,1,__LINE__);
-
- }
-
- if(!in->valid &&
- (tags.objectId == YAFFS_OBJECTID_ROOT ||
- tags.objectId == YAFFS_OBJECTID_LOSTNFOUND))
- {
- // We only load some info, don't fiddle with directory structure
- in->valid = 1;
- in->variantType = oh->type;
-
- in->yst_mode = oh->yst_mode;
-#ifdef CONFIG_YAFFS_WINCE
- in->win_atime[0] = oh->win_atime[0];
- in->win_ctime[0] = oh->win_ctime[0];
- in->win_mtime[0] = oh->win_mtime[0];
- in->win_atime[1] = oh->win_atime[1];
- in->win_ctime[1] = oh->win_ctime[1];
- in->win_mtime[1] = oh->win_mtime[1];
-#else
- in->yst_uid = oh->yst_uid;
- in->yst_gid = oh->yst_gid;
- in->yst_atime = oh->yst_atime;
- in->yst_mtime = oh->yst_mtime;
- in->yst_ctime = oh->yst_ctime;
- in->yst_rdev = oh->yst_rdev;
-#endif
- in->chunkId = chunk;
-
- }
- else if(!in->valid)
- {
- // we need to load this info
-
- in->valid = 1;
- in->variantType = oh->type;
-
- in->yst_mode = oh->yst_mode;
-#ifdef CONFIG_YAFFS_WINCE
- in->win_atime[0] = oh->win_atime[0];
- in->win_ctime[0] = oh->win_ctime[0];
- in->win_mtime[0] = oh->win_mtime[0];
- in->win_atime[1] = oh->win_atime[1];
- in->win_ctime[1] = oh->win_ctime[1];
- in->win_mtime[1] = oh->win_mtime[1];
-#else
- in->yst_uid = oh->yst_uid;
- in->yst_gid = oh->yst_gid;
- in->yst_atime = oh->yst_atime;
- in->yst_mtime = oh->yst_mtime;
- in->yst_ctime = oh->yst_ctime;
- in->yst_rdev = oh->yst_rdev;
+#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
+ /* Special case for case insemsitive systems.
+ * While look-up is case insensitive, the name isn't.
+ * Therefore we might want to change x.txt to X.txt
+ */
+ if (old_dir == new_dir &&
+ old_name && new_name &&
+ strcmp(old_name, new_name) == 0)
+ force = 1;
#endif
- in->chunkId = chunk;
-
- if(oh->shadowsObject > 0)
- {
- yaffs_HandleShadowedObject(dev,oh->shadowsObject,1);
- }
+ if (strnlen(new_name, YAFFS_MAX_NAME_LENGTH + 1) >
+ YAFFS_MAX_NAME_LENGTH)
+ /* ENAMETOOLONG */
+ return YAFFS_FAIL;
- yaffs_SetObjectName(in,oh->name);
- in->dirty = 0;
-
- // directory stuff...
- // hook up to parent
-
- parent = yaffs_FindOrCreateObjectByNumber(dev,oh->parentObjectId,YAFFS_OBJECT_TYPE_DIRECTORY);
- if(parent->variantType == YAFFS_OBJECT_TYPE_UNKNOWN)
- {
- // Set up as a directory
- parent->variantType = YAFFS_OBJECT_TYPE_DIRECTORY;
- INIT_LIST_HEAD(&parent->variant.directoryVariant.children);
- }
- else if(parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
- {
- // Hoosterman, another problem....
- // We're trying to use a non-directory as a directory
+ if (old_name)
+ obj = yaffs_find_by_name(old_dir, old_name);
+ else{
+ obj = old_dir;
+ old_dir = obj->parent;
+ }
+
+ if (obj && obj->rename_allowed) {
+ /* Now handle an existing target, if there is one */
+ existing_target = yaffs_find_by_name(new_dir, new_name);
+ if (yaffs_is_non_empty_dir(existing_target)) {
+ return YAFFS_FAIL; /* ENOTEMPTY */
+ } else if (existing_target && existing_target != obj) {
+ /* Nuke the target first, using shadowing,
+ * but only if it isn't the same object.
+ *
+ * Note we must disable gc here otherwise it can mess
+ * up the shadowing.
+ *
+ */
+ dev->gc_disable = 1;
+ yaffs_change_obj_name(obj, new_dir, new_name, force,
+ existing_target->obj_id);
+ existing_target->is_shadowed = 1;
+ yaffs_unlink_obj(existing_target);
+ dev->gc_disable = 0;
+ }
- T(YAFFS_TRACE_ERROR, (TSTR("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found." TENDSTR)));
- parent = dev->lostNFoundDir;
- }
-
- yaffs_AddObjectToDirectory(parent,in);
+ result = yaffs_change_obj_name(obj, new_dir, new_name, 1, 0);
- if((parent == dev->deletedDir ||
- parent == dev->unlinkedDir))
- {
- in->deleted = 1; // If it is unlinked at start up then it wants deleting
- }
-
- if( oh->isShrink)
- {
- // Mark the block as having a shrinkHeader
- bi->hasShrinkHeader = 1;
- }
-
-
- // Note re hardlinks.
- // Since we might scan a hardlink before its equivalent object is scanned
- // we put them all in a list.
- // After scanning is complete, we should have all the objects, so we run through this
- // list and fix up all the chains.
-
- switch(in->variantType)
- {
- case YAFFS_OBJECT_TYPE_UNKNOWN: // Todo got a problem
- break;
- case YAFFS_OBJECT_TYPE_FILE:
-
-
- if(in->variant.fileVariant.scannedFileSize < oh->fileSize)
- {
- // This covers the case where the file size is > than where the data is
- // This will happen if the file is resized to be larger than its current
- // data extents.
- in->variant.fileVariant.fileSize = oh->fileSize;
- in->variant.fileVariant.scannedFileSize = in->variant.fileVariant.fileSize;
- }
-
- if(oh->isShrink &&
- in->variant.fileVariant.shrinkSize > oh->fileSize)
- {
- in->variant.fileVariant.shrinkSize = oh->fileSize;
- }
-
- break;
- case YAFFS_OBJECT_TYPE_HARDLINK:
- in->variant.hardLinkVariant.equivalentObjectId = oh->equivalentObjectId;
- in->hardLinks.next = (struct list_head *)hardList;
- hardList = in;
- break;
- case YAFFS_OBJECT_TYPE_DIRECTORY: // Do nothing
- break;
- case YAFFS_OBJECT_TYPE_SPECIAL: // Do nothing
- break;
- case YAFFS_OBJECT_TYPE_SYMLINK: // Do nothing
- in->variant.symLinkVariant.alias = yaffs_CloneString(oh->alias);
- break;
- }
+ yaffs_update_parent(old_dir);
+ if (new_dir != old_dir)
+ yaffs_update_parent(new_dir);
-#if 0
- if(parent == dev->deletedDir)
- {
- yaffs_DestroyObject(in);
- bi->hasShrinkHeader = 1;
- }
-#endif
- //T((" %d %d header %d \"%s\" type %d\n",blk,c,tags.objectId,oh->name,in->variantType));
- }
- }
- }
-
- if(state == YAFFS_BLOCK_STATE_NEEDS_SCANNING)
- {
- // If we got this far while scanning, then the block is fully allocated.
- state = YAFFS_BLOCK_STATE_FULL;
- }
-
- bi->blockState = state;
-
- // Now let's see if it was dirty
- if( bi->pagesInUse == 0 &&
- !bi->hasShrinkHeader &&
- bi->blockState == YAFFS_BLOCK_STATE_FULL)
- {
- yaffs_BlockBecameDirty(dev,blk);
- }
-
- }
-
- if(blockIndex)
- {
- YFREE(blockIndex);
- }
-
- // Ok, we've done all the scanning.
-
- // Fix up the hard link chains.
- // We should now have scanned all the objects, now it's time to add these
- // hardlinks.
- while(hardList)
- {
- hl = hardList;
- hardList = (yaffs_Object *)(hardList->hardLinks.next);
-
- in = yaffs_FindObjectByNumber(dev,hl->variant.hardLinkVariant.equivalentObjectId);
-
- if(in)
- {
- // Add the hardlink pointers
- hl->variant.hardLinkVariant.equivalentObject=in;
- list_add(&hl->hardLinks,&in->hardLinks);
- }
- else
- {
- //Todo Need to report/handle this better.
- // Got a problem... hardlink to a non-existant object
- hl->variant.hardLinkVariant.equivalentObject=NULL;
- INIT_LIST_HEAD(&hl->hardLinks);
-
- }
-
- }
-
- {
- struct list_head *i;
- struct list_head *n;
-
- yaffs_Object *l;
-
- // Soft delete all the unlinked files
- list_for_each_safe(i,n,&dev->unlinkedDir->variant.directoryVariant.children)
- {
- if(i)
- {
- l = list_entry(i, yaffs_Object,siblings);
- yaffs_DestroyObject(l);
- }
- }
-
- // Soft delete all the deletedDir files
- list_for_each_safe(i,n,&dev->deletedDir->variant.directoryVariant.children)
- {
- if(i)
- {
- l = list_entry(i, yaffs_Object,siblings);
- yaffs_DestroyObject(l);
-
- }
- }
+ return result;
}
-
- yaffs_ReleaseTempBuffer(dev,chunkData,__LINE__);
-
- T(YAFFS_TRACE_SCAN,(TSTR("yaffs_ScanBackwards ends" TENDSTR)));
-
- return YAFFS_OK;
+ return YAFFS_FAIL;
}
+/*----------------------- Initialisation Scanning ---------------------- */
+void yaffs_handle_shadowed_obj(struct yaffs_dev *dev, int obj_id,
+ int backward_scanning)
+{
+ struct yaffs_obj *obj;
-////////////////////////// Directory Functions /////////////////////////
+ if (backward_scanning) {
+ /* Handle YAFFS2 case (backward scanning)
+ * If the shadowed object exists then ignore.
+ */
+ obj = yaffs_find_by_number(dev, obj_id);
+ if (obj)
+ return;
+ }
+ /* Let's create it (if it does not exist) assuming it is a file so that
+ * it can do shrinking etc.
+ * We put it in unlinked dir to be cleaned up after the scanning
+ */
+ obj =
+ yaffs_find_or_create_by_number(dev, obj_id, YAFFS_OBJECT_TYPE_FILE);
+ if (!obj)
+ return;
+ obj->is_shadowed = 1;
+ yaffs_add_obj_to_dir(dev->unlinked_dir, obj);
+ obj->variant.file_variant.shrink_size = 0;
+ obj->valid = 1; /* So that we don't read any other info. */
+}
+
+void yaffs_link_fixup(struct yaffs_dev *dev, struct list_head *hard_list)
+{
+ struct list_head *lh;
+ struct list_head *save;
+ struct yaffs_obj *hl;
+ struct yaffs_obj *in;
+
+ list_for_each_safe(lh, save, hard_list) {
+ hl = list_entry(lh, struct yaffs_obj, hard_links);
+ in = yaffs_find_by_number(dev,
+ hl->variant.hardlink_variant.equiv_id);
+
+ if (in) {
+ /* Add the hardlink pointers */
+ hl->variant.hardlink_variant.equiv_obj = in;
+ list_add(&hl->hard_links, &in->hard_links);
+ } else {
+ /* Todo Need to report/handle this better.
+ * Got a problem... hardlink to a non-existant object
+ */
+ hl->variant.hardlink_variant.equiv_obj = NULL;
+ INIT_LIST_HEAD(&hl->hard_links);
+ }
+ }
+}
-static void yaffs_AddObjectToDirectory(yaffs_Object *directory, yaffs_Object *obj)
+static void yaffs_strip_deleted_objs(struct yaffs_dev *dev)
{
+ /*
+ * Sort out state of unlinked and deleted objects after scanning.
+ */
+ struct list_head *i;
+ struct list_head *n;
+ struct yaffs_obj *l;
- if(!directory)
- {
- T(YAFFS_TRACE_ALWAYS,(TSTR("tragedy: Trying to add an object to a null pointer directory" TENDSTR)));
- YBUG();
- }
- if(directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
- {
- T(YAFFS_TRACE_ALWAYS,(TSTR("tragedy: Trying to add an object to a non-directory" TENDSTR)));
- YBUG();
- }
+ if (dev->read_only)
+ return;
- if(obj->siblings.prev == NULL)
- {
- // Not initialised
- INIT_LIST_HEAD(&obj->siblings);
-
- }
- else if(!list_empty(&obj->siblings))
- {
- // If it is holed up somewhere else, un hook it
- list_del_init(&obj->siblings);
+ /* Soft delete all the unlinked files */
+ list_for_each_safe(i, n,
+ &dev->unlinked_dir->variant.dir_variant.children) {
+ l = list_entry(i, struct yaffs_obj, siblings);
+ yaffs_del_obj(l);
}
- // Now add it
- list_add(&obj->siblings,&directory->variant.directoryVariant.children);
- obj->parent = directory;
-
- if(directory == obj->myDev->unlinkedDir || directory == obj->myDev->deletedDir)
- {
- obj->unlinked = 1;
- obj->myDev->nUnlinkedFiles++;
- obj->renameAllowed = 0;
+
+ list_for_each_safe(i, n, &dev->del_dir->variant.dir_variant.children) {
+ l = list_entry(i, struct yaffs_obj, siblings);
+ yaffs_del_obj(l);
}
}
-static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj)
+/*
+ * This code iterates through all the objects making sure that they are rooted.
+ * Any unrooted objects are re-rooted in lost+found.
+ * An object needs to be in one of:
+ * - Directly under deleted, unlinked
+ * - Directly or indirectly under root.
+ *
+ * Note:
+ * This code assumes that we don't ever change the current relationships
+ * between directories:
+ * root_dir->parent == unlinked_dir->parent == del_dir->parent == NULL
+ * lost-n-found->parent == root_dir
+ *
+ * This fixes the problem where directories might have inadvertently been
+ * deleted leaving the object "hanging" without being rooted in the
+ * directory tree.
+ */
+
+static int yaffs_has_null_parent(struct yaffs_dev *dev, struct yaffs_obj *obj)
{
- list_del_init(&obj->siblings);
- obj->parent = NULL;
+ return (obj == dev->del_dir ||
+ obj == dev->unlinked_dir || obj == dev->root_dir);
}
-yaffs_Object *yaffs_FindObjectByName(yaffs_Object *directory,const YCHAR *name)
+static void yaffs_fix_hanging_objs(struct yaffs_dev *dev)
{
- int sum;
-
- struct list_head *i;
- YCHAR buffer[YAFFS_MAX_NAME_LENGTH+1];
-
- yaffs_Object *l;
-
- if(!name)
- {
- return NULL;
- }
+ struct yaffs_obj *obj;
+ struct yaffs_obj *parent;
+ int i;
+ struct list_head *lh;
+ struct list_head *n;
+ int depth_limit;
+ int hanging;
- if(!directory)
- {
- T(YAFFS_TRACE_ALWAYS,(TSTR("tragedy: yaffs_FindObjectByName: null pointer directory"TENDSTR)));
- YBUG();
- }
- if(directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
- {
- T(YAFFS_TRACE_ALWAYS,(TSTR("tragedy: yaffs_FindObjectByName: non-directory"TENDSTR)));
- YBUG();
- }
+ if (dev->read_only)
+ return;
- sum = yaffs_CalcNameSum(name);
-
- list_for_each(i,&directory->variant.directoryVariant.children)
- {
- if(i)
- {
- l = list_entry(i, yaffs_Object,siblings);
-
- // Special case for lost-n-found
- if(l->objectId == YAFFS_OBJECTID_LOSTNFOUND)
- {
- if(yaffs_strcmp(name,YAFFS_LOSTNFOUND_NAME) == 0)
- {
- return l;
+ /* Iterate through the objects in each hash entry,
+ * looking at each object.
+ * Make sure it is rooted.
+ */
+
+ for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
+ list_for_each_safe(lh, n, &dev->obj_bucket[i].list) {
+ obj = list_entry(lh, struct yaffs_obj, hash_link);
+ parent = obj->parent;
+
+ if (yaffs_has_null_parent(dev, obj)) {
+ /* These directories are not hanging */
+ hanging = 0;
+ } else if (!parent ||
+ parent->variant_type !=
+ YAFFS_OBJECT_TYPE_DIRECTORY) {
+ hanging = 1;
+ } else if (yaffs_has_null_parent(dev, parent)) {
+ hanging = 0;
+ } else {
+ /*
+ * Need to follow the parent chain to
+ * see if it is hanging.
+ */
+ hanging = 0;
+ depth_limit = 100;
+
+ while (parent != dev->root_dir &&
+ parent->parent &&
+ parent->parent->variant_type ==
+ YAFFS_OBJECT_TYPE_DIRECTORY &&
+ depth_limit > 0) {
+ parent = parent->parent;
+ depth_limit--;
}
+ if (parent != dev->root_dir)
+ hanging = 1;
+ }
+ if (hanging) {
+ yaffs_trace(YAFFS_TRACE_SCAN,
+ "Hanging object %d moved to lost and found",
+ obj->obj_id);
+ yaffs_add_obj_to_dir(dev->lost_n_found, obj);
}
- else if(yaffs_SumCompare(l->sum, sum)||
- l->chunkId <= 0) //LostnFound cunk called Objxxx
- {
- // Do a real check
- yaffs_GetObjectName(l,buffer,YAFFS_MAX_NAME_LENGTH);
- if(yaffs_strcmp(name,buffer) == 0)
- {
- return l;
- }
-
- }
}
}
-
- return NULL;
+}
+
+/*
+ * Delete directory contents for cleaning up lost and found.
+ */
+static void yaffs_del_dir_contents(struct yaffs_obj *dir)
+{
+ struct yaffs_obj *obj;
+ struct list_head *lh;
+ struct list_head *n;
+
+ if (dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
+ BUG();
+
+ list_for_each_safe(lh, n, &dir->variant.dir_variant.children) {
+ obj = list_entry(lh, struct yaffs_obj, siblings);
+ if (obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY)
+ yaffs_del_dir_contents(obj);
+ yaffs_trace(YAFFS_TRACE_SCAN,
+ "Deleting lost_found object %d",
+ obj->obj_id);
+ yaffs_unlink_obj(obj);
+ }
+}
+
+static void yaffs_empty_l_n_f(struct yaffs_dev *dev)
+{
+ yaffs_del_dir_contents(dev->lost_n_found);
}
-int yaffs_ApplyToDirectoryChildren(yaffs_Object *theDir,int (*fn)(yaffs_Object *))
+struct yaffs_obj *yaffs_find_by_name(struct yaffs_obj *directory,
+ const YCHAR *name)
{
- struct list_head *i;
- yaffs_Object *l;
-
+ int sum;
+ struct list_head *i;
+ YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
+ struct yaffs_obj *l;
- if(!theDir)
- {
- T(YAFFS_TRACE_ALWAYS,(TSTR("tragedy: yaffs_FindObjectByName: null pointer directory"TENDSTR)));
- YBUG();
+ if (!name)
+ return NULL;
+
+ if (!directory) {
+ yaffs_trace(YAFFS_TRACE_ALWAYS,
+ "tragedy: yaffs_find_by_name: null pointer directory"
+ );
+ BUG();
+ return NULL;
}
- if(theDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
- {
- T(YAFFS_TRACE_ALWAYS,(TSTR("tragedy: yaffs_FindObjectByName: non-directory"TENDSTR)));
- YBUG();
+ if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
+ yaffs_trace(YAFFS_TRACE_ALWAYS,
+ "tragedy: yaffs_find_by_name: non-directory"
+ );
+ BUG();
}
-
- list_for_each(i,&theDir->variant.directoryVariant.children)
- {
- if(i)
- {
- l = list_entry(i, yaffs_Object,siblings);
- if(l && !fn(l))
- {
- return YAFFS_FAIL;
- }
+
+ sum = yaffs_calc_name_sum(name);
+
+ list_for_each(i, &directory->variant.dir_variant.children) {
+ l = list_entry(i, struct yaffs_obj, siblings);
+
+ if (l->parent != directory)
+ BUG();
+
+ yaffs_check_obj_details_loaded(l);
+
+ /* Special case for lost-n-found */
+ if (l->obj_id == YAFFS_OBJECTID_LOSTNFOUND) {
+ if (!strcmp(name, YAFFS_LOSTNFOUND_NAME))
+ return l;
+ } else if (l->sum == sum || l->hdr_chunk <= 0) {
+ /* LostnFound chunk called Objxxx
+ * Do a real check
+ */
+ yaffs_get_obj_name(l, buffer,
+ YAFFS_MAX_NAME_LENGTH + 1);
+ if (!strncmp(name, buffer, YAFFS_MAX_NAME_LENGTH))
+ return l;
}
}
-
- return YAFFS_OK;
-
+ return NULL;
}
+/* GetEquivalentObject dereferences any hard links to get to the
+ * actual object.
+ */
-// GetEquivalentObject dereferences any hard links to get to the
-// actual object.
-
-yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object *obj)
+struct yaffs_obj *yaffs_get_equivalent_obj(struct yaffs_obj *obj)
{
- if(obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
- {
- // We want the object id of the equivalent object, not this one
- obj = obj->variant.hardLinkVariant.equivalentObject;
+ if (obj && obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) {
+ obj = obj->variant.hardlink_variant.equiv_obj;
+ yaffs_check_obj_details_loaded(obj);
}
return obj;
+}
+
+/*
+ * A note or two on object names.
+ * * If the object name is missing, we then make one up in the form objnnn
+ *
+ * * ASCII names are stored in the object header's name field from byte zero
+ * * Unicode names are historically stored starting from byte zero.
+ *
+ * Then there are automatic Unicode names...
+ * The purpose of these is to save names in a way that can be read as
+ * ASCII or Unicode names as appropriate, thus allowing a Unicode and ASCII
+ * system to share files.
+ *
+ * These automatic unicode are stored slightly differently...
+ * - If the name can fit in the ASCII character space then they are saved as
+ * ascii names as per above.
+ * - If the name needs Unicode then the name is saved in Unicode
+ * starting at oh->name[1].
+ */
+static void yaffs_fix_null_name(struct yaffs_obj *obj, YCHAR *name,
+ int buffer_size)
+{
+ /* Create an object name if we could not find one. */
+ if (strnlen(name, YAFFS_MAX_NAME_LENGTH) == 0) {
+ YCHAR local_name[20];
+ YCHAR num_string[20];
+ YCHAR *x = &num_string[19];
+ unsigned v = obj->obj_id;
+ num_string[19] = 0;
+ while (v > 0) {
+ x--;
+ *x = '0' + (v % 10);
+ v /= 10;
+ }
+ /* make up a name */
+ strcpy(local_name, YAFFS_LOSTNFOUND_PREFIX);
+ strcat(local_name, x);
+ strncpy(name, local_name, buffer_size - 1);
+ }
}
-int yaffs_GetObjectName(yaffs_Object *obj,YCHAR *name,int buffSize)
+int yaffs_get_obj_name(struct yaffs_obj *obj, YCHAR *name, int buffer_size)
{
- memset(name,0,buffSize * sizeof(YCHAR));
-
- if(obj->objectId == YAFFS_OBJECTID_LOSTNFOUND)
- {
- yaffs_strncpy(name,YAFFS_LOSTNFOUND_NAME,buffSize - 1);
- }
- else if(obj->chunkId <= 0)
- {
- YCHAR locName[20];
- // make up a name
- yaffs_sprintf(locName,_Y("%s%d"),YAFFS_LOSTNFOUND_PREFIX,obj->objectId);
- yaffs_strncpy(name,locName,buffSize - 1);
+ memset(name, 0, buffer_size * sizeof(YCHAR));
+ yaffs_check_obj_details_loaded(obj);
+ if (obj->obj_id == YAFFS_OBJECTID_LOSTNFOUND) {
+ strncpy(name, YAFFS_LOSTNFOUND_NAME, buffer_size - 1);
+ } else if (obj->short_name[0]) {
+ strcpy(name, obj->short_name);
+ } else if (obj->hdr_chunk > 0) {
+ int result;
+ u8 *buffer = yaffs_get_temp_buffer(obj->my_dev);
- }
-#ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
- else if(obj->shortName[0])
- {
- yaffs_strcpy(name,obj->shortName);
- }
-#endif
- else
- {
- __u8 *buffer = yaffs_GetTempBuffer(obj->myDev,__LINE__);
-
- yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *)buffer;
-
- memset(buffer,0,obj->myDev->nBytesPerChunk);
-
- if(obj->chunkId >= 0)
- {
- yaffs_ReadChunkWithTagsFromNAND(obj->myDev,obj->chunkId,buffer,NULL);
+ struct yaffs_obj_hdr *oh = (struct yaffs_obj_hdr *)buffer;
+
+ memset(buffer, 0, obj->my_dev->data_bytes_per_chunk);
+
+ if (obj->hdr_chunk > 0) {
+ result = yaffs_rd_chunk_tags_nand(obj->my_dev,
+ obj->hdr_chunk,
+ buffer, NULL);
}
- yaffs_strncpy(name,oh->name,buffSize - 1);
+ yaffs_load_name_from_oh(obj->my_dev, name, oh->name,
+ buffer_size);
- yaffs_ReleaseTempBuffer(obj->myDev,buffer,__LINE__);
+ yaffs_release_temp_buffer(obj->my_dev, buffer);
}
-
- return yaffs_strlen(name);
+
+ yaffs_fix_null_name(obj, name, buffer_size);
+
+ return strnlen(name, YAFFS_MAX_NAME_LENGTH);
}
-int yaffs_GetObjectFileLength(yaffs_Object *obj)
+loff_t yaffs_get_obj_length(struct yaffs_obj *obj)
{
-
- // Dereference any hard linking
- obj = yaffs_GetEquivalentObject(obj);
-
- if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
- {
- return obj->variant.fileVariant.fileSize;
- }
- if(obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
- {
- return yaffs_strlen(obj->variant.symLinkVariant.alias);
+ /* Dereference any hard linking */
+ obj = yaffs_get_equivalent_obj(obj);
+
+ if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE)
+ return obj->variant.file_variant.file_size;
+ if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) {
+ if (!obj->variant.symlink_variant.alias)
+ return 0;
+ return strnlen(obj->variant.symlink_variant.alias,
+ YAFFS_MAX_ALIAS_LENGTH);
+ } else {
+ /* Only a directory should drop through to here */
+ return obj->my_dev->data_bytes_per_chunk;
}
- else
- {
- // Only a directory should drop through to here
- return obj->myDev->nBytesPerChunk;
- }
}
-int yaffs_GetObjectLinkCount(yaffs_Object *obj)
+int yaffs_get_obj_link_count(struct yaffs_obj *obj)
{
- int count = 0;
+ int count = 0;
struct list_head *i;
-
- if(!obj->unlinked)
- {
- count++; // the object itself
- }
- list_for_each(i,&obj->hardLinks)
- {
- count++; // add the hard links;
- }
+
+ if (!obj->unlinked)
+ count++; /* the object itself */
+
+ list_for_each(i, &obj->hard_links)
+ count++; /* add the hard links; */
+
return count;
-
}
-
-int yaffs_GetObjectInode(yaffs_Object *obj)
+int yaffs_get_obj_inode(struct yaffs_obj *obj)
{
- obj = yaffs_GetEquivalentObject(obj);
-
- return obj->objectId;
+ obj = yaffs_get_equivalent_obj(obj);
+
+ return obj->obj_id;
}
-unsigned yaffs_GetObjectType(yaffs_Object *obj)
+unsigned yaffs_get_obj_type(struct yaffs_obj *obj)
{
- obj = yaffs_GetEquivalentObject(obj);
-
- switch(obj->variantType)
- {
- case YAFFS_OBJECT_TYPE_FILE: return DT_REG; break;
- case YAFFS_OBJECT_TYPE_DIRECTORY: return DT_DIR; break;
- case YAFFS_OBJECT_TYPE_SYMLINK: return DT_LNK; break;
- case YAFFS_OBJECT_TYPE_HARDLINK: return DT_REG; break;
- case YAFFS_OBJECT_TYPE_SPECIAL:
- if(S_ISFIFO(obj->yst_mode)) return DT_FIFO;
- if(S_ISCHR(obj->yst_mode)) return DT_CHR;
- if(S_ISBLK(obj->yst_mode)) return DT_BLK;
- if(S_ISSOCK(obj->yst_mode)) return DT_SOCK;
- default: return DT_REG; break;
+ obj = yaffs_get_equivalent_obj(obj);
+
+ switch (obj->variant_type) {
+ case YAFFS_OBJECT_TYPE_FILE:
+ return DT_REG;
+ break;
+ case YAFFS_OBJECT_TYPE_DIRECTORY:
+ return DT_DIR;
+ break;
+ case YAFFS_OBJECT_TYPE_SYMLINK:
+ return DT_LNK;
+ break;
+ case YAFFS_OBJECT_TYPE_HARDLINK:
+ return DT_REG;
+ break;
+ case YAFFS_OBJECT_TYPE_SPECIAL:
+ if (S_ISFIFO(obj->yst_mode))
+ return DT_FIFO;
+ if (S_ISCHR(obj->yst_mode))
+ return DT_CHR;
+ if (S_ISBLK(obj->yst_mode))
+ return DT_BLK;
+ if (S_ISSOCK(obj->yst_mode))
+ return DT_SOCK;
+ return DT_REG;
+ break;
+ default:
+ return DT_REG;
+ break;
}
}
-YCHAR *yaffs_GetSymlinkAlias(yaffs_Object *obj)
+YCHAR *yaffs_get_symlink_alias(struct yaffs_obj *obj)
{
- obj = yaffs_GetEquivalentObject(obj);
- if(obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
- {
- return yaffs_CloneString(obj->variant.symLinkVariant.alias);
- }
+ obj = yaffs_get_equivalent_obj(obj);
+ if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK)
+ return yaffs_clone_str(obj->variant.symlink_variant.alias);
else
- {
- return yaffs_CloneString(_Y(""));
- }
+ return yaffs_clone_str(_Y(""));
}
-#ifndef CONFIG_YAFFS_WINCE
+/*--------------------------- Initialisation code -------------------------- */
-int yaffs_SetAttributes(yaffs_Object *obj, struct iattr *attr)
+static int yaffs_check_dev_fns(const struct yaffs_dev *dev)
{
- unsigned int valid = attr->ia_valid;
-
- if(valid & ATTR_MODE) obj->yst_mode = attr->ia_mode;
- if(valid & ATTR_UID) obj->yst_uid = attr->ia_uid;
- if(valid & ATTR_GID) obj->yst_gid = attr->ia_gid;
-
- if(valid & ATTR_ATIME) obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
- if(valid & ATTR_CTIME) obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
- if(valid & ATTR_MTIME) obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
-
- if(valid & ATTR_SIZE) yaffs_ResizeFile(obj,attr->ia_size);
-
- yaffs_UpdateObjectHeader(obj,NULL,1,0,0);
-
- return YAFFS_OK;
-
-}
-int yaffs_GetAttributes(yaffs_Object *obj, struct iattr *attr)
-{
- unsigned int valid = 0;
-
- attr->ia_mode = obj->yst_mode; valid |= ATTR_MODE;
- attr->ia_uid = obj->yst_uid; valid |= ATTR_UID;
- attr->ia_gid = obj->yst_gid; valid |= ATTR_GID;
-
- Y_TIME_CONVERT(attr->ia_atime)= obj->yst_atime; valid |= ATTR_ATIME;
- Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime; valid |= ATTR_CTIME;
- Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime; valid |= ATTR_MTIME;
-
- attr->ia_size = yaffs_GetFileSize(obj); valid |= ATTR_SIZE;
-
- attr->ia_valid = valid;
-
- return YAFFS_OK;
-
-}
-
-#endif
-
-int yaffs_DumpObject(yaffs_Object *obj)
-{
-// __u8 buffer[YAFFS_BYTES_PER_CHUNK];
- YCHAR name[257];
-// yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *)buffer;
-
-// memset(buffer,0,YAFFS_BYTES_PER_CHUNK);
-
-// if(obj->chunkId >= 0)
-// {
-// yaffs_ReadChunkFromNAND(obj->myDev,obj->chunkId,buffer,NULL);
-// }
-
- yaffs_GetObjectName(obj,name,256);
-
- T(YAFFS_TRACE_ALWAYS,(TSTR("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d chunk %d type %d size %d\n" TENDSTR),
- obj->objectId,yaffs_GetObjectInode(obj), name, obj->dirty, obj->valid, obj->serial,
- obj->sum, obj->chunkId, yaffs_GetObjectType(obj), yaffs_GetObjectFileLength(obj)));
-
-#if 0
- YPRINTF(("Object %d \"%s\"\n dirty %d valid %d serial %d sum %d chunk %d\n",
- obj->objectId, oh->name, obj->dirty, obj->valid, obj->serial,
- obj->sum, obj->chunkId));
- switch(obj->variantType)
- {
- case YAFFS_OBJECT_TYPE_FILE:
- YPRINTF((" FILE length %d\n",obj->variant.fileVariant.fileSize));
- break;
- case YAFFS_OBJECT_TYPE_DIRECTORY:
- YPRINTF((" DIRECTORY\n"));
- break;
- case YAFFS_OBJECT_TYPE_HARDLINK: //todo
- case YAFFS_OBJECT_TYPE_SYMLINK:
- case YAFFS_OBJECT_TYPE_UNKNOWN:
- default:
- }
-#endif
-
- return YAFFS_OK;
-}
+ /* Common functions, gotta have */
+ if (!dev->param.erase_fn || !dev->param.initialise_flash_fn)
+ return 0;
+ /* Can use the "with tags" style interface for yaffs1 or yaffs2 */
+ if (dev->param.write_chunk_tags_fn &&
+ dev->param.read_chunk_tags_fn &&
+ !dev->param.write_chunk_fn &&
+ !dev->param.read_chunk_fn &&
+ dev->param.bad_block_fn && dev->param.query_block_fn)
+ return 1;
-///////////////////////// Initialisation code ///////////////////////////
+ /* Can use the "spare" style interface for yaffs1 */
+ if (!dev->param.is_yaffs2 &&
+ !dev->param.write_chunk_tags_fn &&
+ !dev->param.read_chunk_tags_fn &&
+ dev->param.write_chunk_fn &&
+ dev->param.read_chunk_fn &&
+ !dev->param.bad_block_fn && !dev->param.query_block_fn)
+ return 1;
+ return 0; /* bad */
+}
-static int yaffs_CheckDevFunctions(const yaffs_Device *dev)
+static int yaffs_create_initial_dir(struct yaffs_dev *dev)
{
+ /* Initialise the unlinked, deleted, root and lost+found directories */
+ dev->lost_n_found = dev->root_dir = NULL;
+ dev->unlinked_dir = dev->del_dir = NULL;
+ dev->unlinked_dir =
+ yaffs_create_fake_dir(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
+ dev->del_dir =
+ yaffs_create_fake_dir(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
+ dev->root_dir =
+ yaffs_create_fake_dir(dev, YAFFS_OBJECTID_ROOT,
+ YAFFS_ROOT_MODE | S_IFDIR);
+ dev->lost_n_found =
+ yaffs_create_fake_dir(dev, YAFFS_OBJECTID_LOSTNFOUND,
+ YAFFS_LOSTNFOUND_MODE | S_IFDIR);
- // Common functions, gotta have
- if(!dev->eraseBlockInNAND ||
- !dev->initialiseNAND) return 0;
-
-#ifdef CONFIG_YAFFS_YAFFS2
-
- // Can use the "with tags" style interface for yaffs1 or yaffs2
- if(dev->writeChunkWithTagsToNAND &&
- dev->readChunkWithTagsFromNAND &&
- !dev->writeChunkToNAND &&
- !dev->readChunkFromNAND &&
- dev->markNANDBlockBad &&
- dev->queryNANDBlock) return 1;
-#endif
-
- // Can use the "spare" style interface for yaffs1
- if(!dev->isYaffs2 &&
- !dev->writeChunkWithTagsToNAND &&
- !dev->readChunkWithTagsFromNAND &&
- dev->writeChunkToNAND &&
- dev->readChunkFromNAND &&
- !dev->markNANDBlockBad &&
- !dev->queryNANDBlock) return 1;
-
- return 0; // bad
+ if (dev->lost_n_found && dev->root_dir && dev->unlinked_dir
+ && dev->del_dir) {
+ yaffs_add_obj_to_dir(dev->root_dir, dev->lost_n_found);
+ return YAFFS_OK;
+ }
+ return YAFFS_FAIL;
}
-
-int yaffs_GutsInitialise(yaffs_Device *dev)
+int yaffs_guts_initialise(struct yaffs_dev *dev)
{
+ int init_failed = 0;
unsigned x;
int bits;
- int extraBits;
- int nBlocks;
- T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: yaffs_GutsInitialise()" TENDSTR)));
- // Check stuff that must be set
+ yaffs_trace(YAFFS_TRACE_TRACING, "yaffs: yaffs_guts_initialise()");
- if(!dev)
- {
- T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: Need a device" TENDSTR)));
- return YAFFS_FAIL;
- }
-
- dev->internalStartBlock = dev->startBlock;
- dev->internalEndBlock = dev->endBlock;
- dev->blockOffset = 0;
- dev->chunkOffset = 0;
- dev->nFreeChunks = 0;
-
- if(dev->startBlock == 0)
- {
- dev->internalStartBlock = dev->startBlock + 1;
- dev->internalEndBlock = dev->endBlock + 1;
- dev->blockOffset = 1;
- dev->chunkOffset = dev->nChunksPerBlock;
- }
-
- // Check geometry parameters.
-
- if( (dev->isYaffs2 && dev->nBytesPerChunk <1024) ||
- (!dev->isYaffs2 && dev->nBytesPerChunk !=512) ||
- dev->nChunksPerBlock < 2 ||
- dev->nReservedBlocks < 2 ||
- dev->internalStartBlock <= 0 ||
- dev->internalEndBlock <= 0 ||
- dev->internalEndBlock <= (dev->internalStartBlock + dev->nReservedBlocks + 2) // otherwise it is too small
- )
- {
- T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: NAND geometry problems: chunk size %d, type is yaffs%s " TENDSTR),
- dev->nBytesPerChunk, dev->isYaffs2 ? "2" : ""));
+ /* Check stuff that must be set */
+
+ if (!dev) {
+ yaffs_trace(YAFFS_TRACE_ALWAYS,
+ "yaffs: Need a device"
+ );
return YAFFS_FAIL;
}
- if(yaffs_InitialiseNAND(dev) != YAFFS_OK)
- {
- T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: InitialiseNAND failed" TENDSTR)));
+ if (dev->is_mounted) {
+ yaffs_trace(YAFFS_TRACE_ALWAYS, "device already mounted");
return YAFFS_FAIL;
}
- // Got the right mix of functions?
- //
- if(!yaffs_CheckDevFunctions(dev))
- {
- //Function missing
- T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: device function(s) missing or wrong\n" TENDSTR)));
-
+ dev->internal_start_block = dev->param.start_block;
+ dev->internal_end_block = dev->param.end_block;
+ dev->block_offset = 0;
+ dev->chunk_offset = 0;
+ dev->n_free_chunks = 0;
+
+ dev->gc_block = 0;
+
+ if (dev->param.start_block == 0) {
+ dev->internal_start_block = dev->param.start_block + 1;
+ dev->internal_end_block = dev->param.end_block + 1;
+ dev->block_offset = 1;
+ dev->chunk_offset = dev->param.chunks_per_block;
+ }
+
+ /* Check geometry parameters. */
+
+ if ((!dev->param.inband_tags && dev->param.is_yaffs2 &&
+ dev->param.total_bytes_per_chunk < 1024) ||
+ (!dev->param.is_yaffs2 &&
+ dev->param.total_bytes_per_chunk < 512) ||
+ (dev->param.inband_tags && !dev->param.is_yaffs2) ||
+ dev->param.chunks_per_block < 2 ||
+ dev->param.n_reserved_blocks < 2 ||
+ dev->internal_start_block <= 0 ||
+ dev->internal_end_block <= 0 ||
+ dev->internal_end_block <=
+ (dev->internal_start_block + dev->param.n_reserved_blocks + 2)
+ ) {
+ /* otherwise it is too small */
+ yaffs_trace(YAFFS_TRACE_ALWAYS,
+ "NAND geometry problems: chunk size %d, type is yaffs%s, inband_tags %d ",
+ dev->param.total_bytes_per_chunk,
+ dev->param.is_yaffs2 ? "2" : "",
+ dev->param.inband_tags);
return YAFFS_FAIL;
}
- // This is really a compilation check.
- if(!yaffs_CheckStructures())
- {
- T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs_CheckStructures failed\n" TENDSTR)));
+ if (yaffs_init_nand(dev) != YAFFS_OK) {
+ yaffs_trace(YAFFS_TRACE_ALWAYS, "InitialiseNAND failed");
return YAFFS_FAIL;
}
- if(dev->isMounted)
- {
- T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: device already mounted\n" TENDSTR)));
+ /* Sort out space for inband tags, if required */
+ if (dev->param.inband_tags)
+ dev->data_bytes_per_chunk =
+ dev->param.total_bytes_per_chunk -
+ sizeof(struct yaffs_packed_tags2_tags_only);
+ else
+ dev->data_bytes_per_chunk = dev->param.total_bytes_per_chunk;
+
+ /* Got the right mix of functions? */
+ if (!yaffs_check_dev_fns(dev)) {
+ /* Function missing */
+ yaffs_trace(YAFFS_TRACE_ALWAYS,
+ "device function(s) missing or wrong");
+
return YAFFS_FAIL;
}
- //
- //
- // Finished with most checks. One or two more checks happen later on too.
- //
+ /* Finished with most checks. Further checks happen later on too. */
- dev->isMounted = 1;
+ dev->is_mounted = 1;
+ /* OK now calculate a few things for the device */
- nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
+ /*
+ * Calculate all the chunk size manipulation numbers:
+ */
+ x = dev->data_bytes_per_chunk;
+ /* We always use dev->chunk_shift and dev->chunk_div */
+ dev->chunk_shift = calc_shifts(x);
+ x >>= dev->chunk_shift;
+ dev->chunk_div = x;
+ /* We only use chunk mask if chunk_div is 1 */
+ dev->chunk_mask = (1 << dev->chunk_shift) - 1;
+ /*
+ * Calculate chunk_grp_bits.
+ * We need to find the next power of 2 > than internal_end_block
+ */
+ x = dev->param.chunks_per_block * (dev->internal_end_block + 1);
- // OK now calculate a few things for the device
- // Calculate chunkGroupBits.
- // We need to find the next power of 2 > than internalEndBlock
-
- x = dev->nChunksPerBlock * (dev->internalEndBlock+1);
-
- for(bits = extraBits = 0; x > 1; bits++)
- {
- if(x & 1) extraBits++;
- x >>= 1;
- }
+ bits = calc_shifts_ceiling(x);
- if(extraBits > 0) bits++;
-
-
- // Level0 Tnodes are 16 bits, so if the bitwidth of the
- // chunk range we're using is greater than 16 we need
- // to figure out chunk shift and chunkGroupSize
- if(bits <= 16)
- {
- dev->chunkGroupBits = 0;
+ /* Set up tnode width if wide tnodes are enabled. */
+ if (!dev->param.wide_tnodes_disabled) {
+ /* bits must be even so that we end up with 32-bit words */
+ if (bits & 1)
+ bits++;
+ if (bits < 16)
+ dev->tnode_width = 16;
+ else
+ dev->tnode_width = bits;
+ } else {
+ dev->tnode_width = 16;
}
+
+ dev->tnode_mask = (1 << dev->tnode_width) - 1;
+
+ /* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
+ * so if the bitwidth of the
+ * chunk range we're using is greater than 16 we need
+ * to figure out chunk shift and chunk_grp_size
+ */
+
+ if (bits <= dev->tnode_width)
+ dev->chunk_grp_bits = 0;
else
- {
- dev->chunkGroupBits = bits - 16;
- }
-
- dev->chunkGroupSize = 1 << dev->chunkGroupBits;
+ dev->chunk_grp_bits = bits - dev->tnode_width;
+
+ dev->tnode_size = (dev->tnode_width * YAFFS_NTNODES_LEVEL0) / 8;
+ if (dev->tnode_size < sizeof(struct yaffs_tnode))
+ dev->tnode_size = sizeof(struct yaffs_tnode);
+
+ dev->chunk_grp_size = 1 << dev->chunk_grp_bits;
+
+ if (dev->param.chunks_per_block < dev->chunk_grp_size) {
+ /* We have a problem because the soft delete won't work if
+ * the chunk group size > chunks per block.
+ * This can be remedied by using larger "virtual blocks".
+ */
+ yaffs_trace(YAFFS_TRACE_ALWAYS, "chunk group too large");
- if(dev->nChunksPerBlock < dev->chunkGroupSize)
- {
- // We have a problem because the soft delete won't work if
- // the chunk group size > chunks per block.
- // This can be remedied by using larger "virtual blocks".
- T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: chunk group too large\n" TENDSTR)));
-
return YAFFS_FAIL;
}
-
- // OK, we've finished verifying the device, lets continue with initialisation
-
- // More device initialisation
- dev->garbageCollections = 0;
- dev->passiveGarbageCollections = 0;
- dev->currentDirtyChecker = 0;
- dev->bufferedBlock = -1;
- dev->doingBufferedBlockRewrite = 0;
- dev->nDeletedFiles = 0;
- dev->nBackgroundDeletions=0;
- dev->nUnlinkedFiles = 0;
- dev->eccFixed=0;
- dev->eccUnfixed=0;
- dev->tagsEccFixed=0;
- dev->tagsEccUnfixed=0;
- dev->nErasureFailures = 0;
- dev->nErasedBlocks = 0;
- dev->isDoingGC = 0;
-
- //dev->localBuffer = YMALLOC(dev->nBytesPerChunk);
- // Initialise temporary buffers
- {
+ /* Finished verifying the device, continue with initialisation */
+
+ /* More device initialisation */
+ dev->all_gcs = 0;
+ dev->passive_gc_count = 0;
+ dev->oldest_dirty_gc_count = 0;
+ dev->bg_gcs = 0;
+ dev->gc_block_finder = 0;
+ dev->buffered_block = -1;
+ dev->doing_buffered_block_rewrite = 0;
+ dev->n_deleted_files = 0;
+ dev->n_bg_deletions = 0;
+ dev->n_unlinked_files = 0;
+ dev->n_ecc_fixed = 0;
+ dev->n_ecc_unfixed = 0;
+ dev->n_tags_ecc_fixed = 0;
+ dev->n_tags_ecc_unfixed = 0;
+ dev->n_erase_failures = 0;
+ dev->n_erased_blocks = 0;
+ dev->gc_disable = 0;
+ dev->has_pending_prioritised_gc = 1;
+ /* Assume the worst for now, will get fixed on first GC */
+ INIT_LIST_HEAD(&dev->dirty_dirs);
+ dev->oldest_dirty_seq = 0;
+ dev->oldest_dirty_block = 0;
+
+ /* Initialise temporary buffers and caches. */
+ if (!yaffs_init_tmp_buffers(dev))
+ init_failed = 1;
+
+ dev->cache = NULL;
+ dev->gc_cleanup_list = NULL;
+
+ if (!init_failed && dev->param.n_caches > 0) {
int i;
- for(i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
- {
- dev->tempBuffer[i].line = 0; // not in use
- dev->tempBuffer[i].buffer = YMALLOC(dev->nBytesPerChunk);
+ void *buf;
+ int cache_bytes =
+ dev->param.n_caches * sizeof(struct yaffs_cache);
+
+ if (dev->param.n_caches > YAFFS_MAX_SHORT_OP_CACHES)
+ dev->param.n_caches = YAFFS_MAX_SHORT_OP_CACHES;
+
+ dev->cache = kmalloc(cache_bytes, GFP_NOFS);
+
+ buf = (u8 *) dev->cache;
+
+ if (dev->cache)
+ memset(dev->cache, 0, cache_bytes);
+
+ for (i = 0; i < dev->param.n_caches && buf; i++) {
+ dev->cache[i].object = NULL;
+ dev->cache[i].last_use = 0;
+ dev->cache[i].dirty = 0;
+ dev->cache[i].data = buf =
+ kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS);
}
+ if (!buf)
+ init_failed = 1;
+
+ dev->cache_last_use = 0;
}
-
-
- yaffs_InitialiseBlocks(dev,nBlocks);
-
- yaffs_InitialiseTnodes(dev);
+ dev->cache_hits = 0;
- yaffs_InitialiseObjects(dev);
-
- dev->gcCleanupList = YMALLOC(dev->nChunksPerBlock * sizeof(__u32));
-
- if(dev->nShortOpCaches > 0)
- {
- int i;
-
- if(dev->nShortOpCaches > YAFFS_MAX_SHORT_OP_CACHES)
- {
- dev->nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES;
- }
-
- dev->srCache = YMALLOC( dev->nShortOpCaches * sizeof(yaffs_ChunkCache));
-
- for(i=0; i < dev->nShortOpCaches; i++)
- {
- dev->srCache[i].object = NULL;
- dev->srCache[i].lastUse = 0;
- dev->srCache[i].dirty = 0;
- dev->srCache[i].data = YMALLOC(dev->nBytesPerChunk);
+ if (!init_failed) {
+ dev->gc_cleanup_list =
+ kmalloc(dev->param.chunks_per_block * sizeof(u32),
+ GFP_NOFS);
+ if (!dev->gc_cleanup_list)
+ init_failed = 1;
+ }
+
+ if (dev->param.is_yaffs2)
+ dev->param.use_header_file_size = 1;
+
+ if (!init_failed && !yaffs_init_blocks(dev))
+ init_failed = 1;
+
+ yaffs_init_tnodes_and_objs(dev);
+
+ if (!init_failed && !yaffs_create_initial_dir(dev))
+ init_failed = 1;
+
+ if (!init_failed && dev->param.is_yaffs2 &&
+ !dev->param.disable_summary &&
+ !yaffs_summary_init(dev))
+ init_failed = 1;
+
+ if (!init_failed) {
+ /* Now scan the flash. */
+ if (dev->param.is_yaffs2) {
+ if (yaffs2_checkpt_restore(dev)) {
+ yaffs_check_obj_details_loaded(dev->root_dir);
+ yaffs_trace(YAFFS_TRACE_CHECKPOINT |
+ YAFFS_TRACE_MOUNT,
+ "yaffs: restored from checkpoint"
+ );
+ } else {
+
+ /* Clean up the mess caused by an aborted
+ * checkpoint load then scan backwards.
+ */
+ yaffs_deinit_blocks(dev);
+
+ yaffs_deinit_tnodes_and_objs(dev);
+
+ dev->n_erased_blocks = 0;
+ dev->n_free_chunks = 0;
+ dev->alloc_block = -1;
+ dev->alloc_page = -1;
+ dev->n_deleted_files = 0;
+ dev->n_unlinked_files = 0;
+ dev->n_bg_deletions = 0;
+
+ if (!init_failed && !yaffs_init_blocks(dev))
+ init_failed = 1;
+
+ yaffs_init_tnodes_and_objs(dev);
+
+ if (!init_failed
+ && !yaffs_create_initial_dir(dev))
+ init_failed = 1;
+
+ if (!init_failed && !yaffs2_scan_backwards(dev))
+ init_failed = 1;
+ }
+ } else if (!yaffs1_scan(dev)) {
+ init_failed = 1;
}
- dev->srLastUse = 0;
- }
-
- dev->cacheHits = 0;
-
-
- // Initialise the unlinked, root and lost and found directories
- dev->lostNFoundDir = dev->rootDir = dev->unlinkedDir = dev->deletedDir = NULL;
-
- dev->unlinkedDir = yaffs_CreateFakeDirectory(dev,YAFFS_OBJECTID_UNLINKED, S_IFDIR);
- dev->deletedDir = yaffs_CreateFakeDirectory(dev,YAFFS_OBJECTID_DELETED, S_IFDIR);
-
- dev->rootDir = yaffs_CreateFakeDirectory(dev,YAFFS_OBJECTID_ROOT,YAFFS_ROOT_MODE | S_IFDIR);
- dev->lostNFoundDir = yaffs_CreateFakeDirectory(dev,YAFFS_OBJECTID_LOSTNFOUND,YAFFS_LOSTNFOUND_MODE | S_IFDIR);
- yaffs_AddObjectToDirectory(dev->rootDir,dev->lostNFoundDir);
-
- if(dev->isYaffs2)
- {
- dev->useHeaderFileSize = 1;
+
+ yaffs_strip_deleted_objs(dev);
+ yaffs_fix_hanging_objs(dev);
+ if (dev->param.empty_lost_n_found)
+ yaffs_empty_l_n_f(dev);
}
-
- // Now scan the flash.
-
- if(dev->isYaffs2)
- yaffs_ScanBackwards(dev);
- else
- yaffs_Scan(dev);
-
- // Zero out stats
- dev->nPageReads = 0;
- dev->nPageWrites = 0;
- dev->nBlockErasures = 0;
- dev->nGCCopies = 0;
- dev->nRetriedWrites = 0;
-
- dev->nRetiredBlocks = 0;
-
- yaffs_VerifyFreeChunks(dev);
-
- T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: yaffs_GutsInitialise() done.\n" TENDSTR)));
+
+ if (init_failed) {
+ /* Clean up the mess */
+ yaffs_trace(YAFFS_TRACE_TRACING,
+ "yaffs: yaffs_guts_initialise() aborted.");
+
+ yaffs_deinitialise(dev);
+ return YAFFS_FAIL;
+ }
+
+ /* Zero out stats */
+ dev->n_page_reads = 0;
+ dev->n_page_writes = 0;
+ dev->n_erasures = 0;
+ dev->n_gc_copies = 0;
+ dev->n_retried_writes = 0;
+
+ dev->n_retired_blocks = 0;
+
+ yaffs_verify_free_chunks(dev);
+ yaffs_verify_blocks(dev);
+
+ /* Clean up any aborted checkpoint data */
+ if (!dev->is_checkpointed && dev->blocks_in_checkpt > 0)
+ yaffs2_checkpt_invalidate(dev);
+
+ yaffs_trace(YAFFS_TRACE_TRACING,
+ "yaffs: yaffs_guts_initialise() done.");
return YAFFS_OK;
-
}
-void yaffs_Deinitialise(yaffs_Device *dev)
+void yaffs_deinitialise(struct yaffs_dev *dev)
{
- if(dev->isMounted)
- {
+ if (dev->is_mounted) {
int i;
-
- yaffs_DeinitialiseBlocks(dev);
- yaffs_DeinitialiseTnodes(dev);
- yaffs_DeinitialiseObjects(dev);
- if(dev->nShortOpCaches > 0)
- {
-
- for(i=0; i < dev->nShortOpCaches; i++)
- {
- YFREE(dev->srCache[i].data);
+
+ yaffs_deinit_blocks(dev);
+ yaffs_deinit_tnodes_and_objs(dev);
+ yaffs_summary_deinit(dev);
+
+ if (dev->param.n_caches > 0 && dev->cache) {
+
+ for (i = 0; i < dev->param.n_caches; i++) {
+ kfree(dev->cache[i].data);
+ dev->cache[i].data = NULL;
}
- YFREE(dev->srCache);
+ kfree(dev->cache);
+ dev->cache = NULL;
}
- YFREE(dev->gcCleanupList);
+ kfree(dev->gc_cleanup_list);
- for(i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
- {
- YFREE(dev->tempBuffer[i].buffer);
- }
-
- dev->isMounted = 0;
+ for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
+ kfree(dev->temp_buffer[i].buffer);
+
+ dev->is_mounted = 0;
+
+ if (dev->param.deinitialise_flash_fn)
+ dev->param.deinitialise_flash_fn(dev);
}
-
}
-#if 0
-
-int yaffs_GetNumberOfFreeChunks(yaffs_Device *dev)
+int yaffs_count_free_chunks(struct yaffs_dev *dev)
{
- int nFree = dev->nFreeChunks - (dev->nChunksPerBlock * YAFFS_RESERVED_BLOCKS);
-
- struct list_head *i;
- yaffs_Object *l;
-
-
- // To the free chunks add the chunks that are in the deleted unlinked files.
- list_for_each(i,&dev->deletedDir->variant.directoryVariant.children)
- {
- l = list_entry(i, yaffs_Object,siblings);
- if(l->deleted)
- {
- nFree++;
- nFree += l->nDataChunks;
+ int n_free = 0;
+ int b;
+ struct yaffs_block_info *blk;
+
+ blk = dev->block_info;
+ for (b = dev->internal_start_block; b <= dev->internal_end_block; b++) {
+ switch (blk->block_state) {
+ case YAFFS_BLOCK_STATE_EMPTY:
+ case YAFFS_BLOCK_STATE_ALLOCATING:
+ case YAFFS_BLOCK_STATE_COLLECTING:
+ case YAFFS_BLOCK_STATE_FULL:
+ n_free +=
+ (dev->param.chunks_per_block - blk->pages_in_use +
+ blk->soft_del_pages);
+ break;
+ default:
+ break;
}
+ blk++;
}
-
-
- // printf("___________ nFreeChunks is %d nFree is %d\n",dev->nFreeChunks,nFree);
-
- if(nFree < 0) nFree = 0;
-
- return nFree;
-
+ return n_free;
}
-#endif
-
-static int yaffs_CountFreeChunks(yaffs_Device *dev)
+int yaffs_get_n_free_chunks(struct yaffs_dev *dev)
{
- int nFree;
- int b;
+ /* This is what we report to the outside world */
+ int n_free;
+ int n_dirty_caches;
+ int blocks_for_checkpt;
+ int i;
- yaffs_BlockInfo *blk;
+ n_free = dev->n_free_chunks;
+ n_free += dev->n_deleted_files;
-
- for(nFree = 0, b = dev->internalStartBlock; b <= dev->internalEndBlock; b++)
- {
- blk = yaffs_GetBlockInfo(dev,b);
-
- switch(blk->blockState)
- {
- case YAFFS_BLOCK_STATE_EMPTY:
- case YAFFS_BLOCK_STATE_ALLOCATING:
- case YAFFS_BLOCK_STATE_COLLECTING:
- case YAFFS_BLOCK_STATE_FULL: nFree += (dev->nChunksPerBlock - blk->pagesInUse + blk->softDeletions); break;
- default: break;
- }
+ /* Now count and subtract the number of dirty chunks in the cache. */
+ for (n_dirty_caches = 0, i = 0; i < dev->param.n_caches; i++) {
+ if (dev->cache[i].dirty)
+ n_dirty_caches++;
}
-
- return nFree;
-}
-
+ n_free -= n_dirty_caches;
-int yaffs_GetNumberOfFreeChunks(yaffs_Device *dev)
-{
- // This is what we report to the outside world
+ n_free -=
+ ((dev->param.n_reserved_blocks + 1) * dev->param.chunks_per_block);
- int nFree;
- int nDirtyCacheChunks;
-
-#if 1
- nFree = dev->nFreeChunks;
-#else
- nFree = yaffs_CountFreeChunks(dev);
-#endif
-
- // Now count the number of dirty chunks in the cache and subtract those
-
- {
- int i;
- for( nDirtyCacheChunks = 0,i = 0; i < dev->nShortOpCaches; i++)
- {
- if(dev->srCache[i].dirty) nDirtyCacheChunks++;
- }
- }
-
- nFree -= nDirtyCacheChunks;
-
- nFree -= ((dev->nReservedBlocks + 1) * dev->nChunksPerBlock);
-
- if(nFree < 0) nFree = 0;
+ /* Now figure checkpoint space and report that... */
+ blocks_for_checkpt = yaffs_calc_checkpt_blocks_required(dev);
- return nFree;
-
-}
+ n_free -= (blocks_for_checkpt * dev->param.chunks_per_block);
-static int yaffs_freeVerificationFailures;
+ if (n_free < 0)
+ n_free = 0;
-static void yaffs_VerifyFreeChunks(yaffs_Device *dev)
-{
- int counted = yaffs_CountFreeChunks(dev);
-
- int difference = dev->nFreeChunks - counted;
-
- if(difference)
- {
- T(YAFFS_TRACE_ALWAYS,(TSTR("Freechunks verification failure %d %d %d" TENDSTR),dev->nFreeChunks,counted,difference));
- yaffs_freeVerificationFailures++;
- }
+ return n_free;
}
-/////////////////// YAFFS test code //////////////////////////////////
-
-#define yaffs_CheckStruct(structure,syze, name) \
- if(sizeof(structure) != syze) \
- { \
- T(YAFFS_TRACE_ALWAYS,(TSTR("%s should be %d but is %d\n" TENDSTR),name,syze,sizeof(structure))); \
- return YAFFS_FAIL; \
- }
-
-
-static int yaffs_CheckStructures(void)
+/*\
+ * Marshalling functions to get loff_t file sizes into aand out of
+ * object headers.
+ */
+void yaffs_oh_size_load(struct yaffs_obj_hdr *oh, loff_t fsize)
{
-// yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags")
-// yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion")
-// yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare")
-#ifndef CONFIG_YAFFS_TNODE_LIST_DEBUG
- yaffs_CheckStruct(yaffs_Tnode,2* YAFFS_NTNODES_LEVEL0,"yaffs_Tnode")
-#endif
- yaffs_CheckStruct(yaffs_ObjectHeader,512,"yaffs_ObjectHeader")
-
-
- return YAFFS_OK;
+ oh->file_size_low = (fsize & 0xFFFFFFFF);
+ oh->file_size_high = ((fsize >> 32) & 0xFFFFFFFF);
}
-#if 0
-void yaffs_GutsTest(yaffs_Device *dev)
+loff_t yaffs_oh_to_size(struct yaffs_obj_hdr *oh)
{
-
- if(yaffs_CheckStructures() != YAFFS_OK)
- {
- T(YAFFS_TRACE_ALWAYS,(TSTR("One or more structures malformed-- aborting\n" TENDSTR)));
- return;
- }
-
- yaffs_TnodeTest(dev);
- yaffs_ObjectTest(dev);
-}
-#endif
+ loff_t retval;
+ if (~(oh->file_size_high))
+ retval = (((loff_t) oh->file_size_high) << 32) |
+ (((loff_t) oh->file_size_low) & 0xFFFFFFFF);
+ else
+ retval = (loff_t) oh->file_size_low;
+ return retval;
+}
projects / yaffs2.git / blobdiff