2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
4 * Copyright (C) 2002-2010 Aleph One Ltd.
5 * for Toby Churchill Ltd and Brightstar Engineering
7 * Created by Charles Manning <charles@aleph1.co.uk>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
14 #include "yaffs_trace.h"
16 #include "yaffsinterface.h"
17 #include "yaffs_guts.h"
18 #include "yaffs_tagsvalidity.h"
19 #include "yaffs_getblockinfo.h"
21 #include "yaffs_tagscompat.h"
23 #include "yaffs_nand.h"
25 #include "yaffs_yaffs1.h"
26 #include "yaffs_yaffs2.h"
27 #include "yaffs_bitmap.h"
28 #include "yaffs_verify.h"
30 #include "yaffs_nand.h"
31 #include "yaffs_packedtags2.h"
33 #include "yaffs_nameval.h"
34 #include "yaffs_allocator.h"
36 /* Note YAFFS_GC_GOOD_ENOUGH must be <= YAFFS_GC_PASSIVE_THRESHOLD */
37 #define YAFFS_GC_GOOD_ENOUGH 2
38 #define YAFFS_GC_PASSIVE_THRESHOLD 4
40 #include "yaffs_ecc.h"
44 /* Robustification (if it ever comes about...) */
45 static void yaffs_retire_block(yaffs_dev_t *dev, int flash_block);
46 static void yaffs_handle_chunk_wr_error(yaffs_dev_t *dev, int nand_chunk,
48 static void yaffs_handle_chunk_wr_ok(yaffs_dev_t *dev, int nand_chunk,
50 const yaffs_ext_tags *tags);
51 static void yaffs_handle_chunk_update(yaffs_dev_t *dev, int nand_chunk,
52 const yaffs_ext_tags *tags);
54 /* Other local prototypes */
55 static void yaffs_update_parent(yaffs_obj_t *obj);
56 static int yaffs_unlink_obj(yaffs_obj_t *obj);
57 static int yaffs_obj_cache_dirty(yaffs_obj_t *obj);
59 static int yaffs_write_new_chunk(yaffs_dev_t *dev,
65 static yaffs_obj_t *yaffs_new_obj(yaffs_dev_t *dev, int number,
69 static int yaffs_apply_xattrib_mod(yaffs_obj_t *obj, char *buffer, yaffs_xattr_mod *xmod);
71 static void yaffs_remove_obj_from_dir(yaffs_obj_t *obj);
72 static int yaffs_check_structures(void);
73 static int yaffs_generic_obj_del(yaffs_obj_t *in);
75 static int yaffs_check_chunk_erased(struct yaffs_dev_s *dev,
78 static int yaffs_unlink_worker(yaffs_obj_t *obj);
80 static int yaffs_tags_match(const yaffs_ext_tags *tags, int obj_id,
83 static int yaffs_alloc_chunk(yaffs_dev_t *dev, int useReserve,
84 yaffs_block_info_t **blockUsedPtr);
86 static void yaffs_check_obj_details_loaded(yaffs_obj_t *in);
88 static void yaffs_invalidate_whole_cache(yaffs_obj_t *in);
89 static void yaffs_invalidate_chunk_cache(yaffs_obj_t *object, int chunk_id);
91 static int yaffs_find_chunk_in_file(yaffs_obj_t *in, int inode_chunk,
92 yaffs_ext_tags *tags);
94 static int yaffs_verify_chunk_written(yaffs_dev_t *dev,
97 yaffs_ext_tags *tags);
100 static void yaffs_load_name_from_oh(yaffs_dev_t *dev,YCHAR *name, const YCHAR *ohName, int bufferSize);
101 static void yaffs_load_oh_from_name(yaffs_dev_t *dev,YCHAR *ohName, const YCHAR *name);
104 /* Function to calculate chunk and offset */
106 static void yaffs_addr_to_chunk(yaffs_dev_t *dev, loff_t addr, int *chunkOut,
112 chunk = (__u32)(addr >> dev->chunk_shift);
114 if (dev->chunk_div == 1) {
115 /* easy power of 2 case */
116 offset = (__u32)(addr & dev->chunk_mask);
118 /* Non power-of-2 case */
122 chunk /= dev->chunk_div;
124 chunkBase = ((loff_t)chunk) * dev->data_bytes_per_chunk;
125 offset = (__u32)(addr - chunkBase);
132 /* Function to return the number of shifts for a power of 2 greater than or
133 * equal to the given number
134 * Note we don't try to cater for all possible numbers and this does not have to
135 * be hellishly efficient.
138 static __u32 ShiftsGE(__u32 x)
143 nShifts = extraBits = 0;
158 /* Function to return the number of shifts to get a 1 in bit 0
161 static __u32 Shifts(__u32 x)
181 * Temporary buffer manipulations.
184 static int yaffs_init_tmp_buffers(yaffs_dev_t *dev)
187 __u8 *buf = (__u8 *)1;
189 memset(dev->temp_buffer, 0, sizeof(dev->temp_buffer));
191 for (i = 0; buf && i < YAFFS_N_TEMP_BUFFERS; i++) {
192 dev->temp_buffer[i].line = 0; /* not in use */
193 dev->temp_buffer[i].buffer = buf =
194 YMALLOC_DMA(dev->param.total_bytes_per_chunk);
197 return buf ? YAFFS_OK : YAFFS_FAIL;
200 __u8 *yaffs_get_temp_buffer(yaffs_dev_t *dev, int line_no)
205 if (dev->temp_in_use > dev->max_temp)
206 dev->max_temp = dev->temp_in_use;
208 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
209 if (dev->temp_buffer[i].line == 0) {
210 dev->temp_buffer[i].line = line_no;
211 if ((i + 1) > dev->max_temp) {
212 dev->max_temp = i + 1;
213 for (j = 0; j <= i; j++)
214 dev->temp_buffer[j].max_line =
215 dev->temp_buffer[j].line;
218 return dev->temp_buffer[i].buffer;
222 T(YAFFS_TRACE_BUFFERS,
223 (TSTR("Out of temp buffers at line %d, other held by lines:"),
225 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
226 T(YAFFS_TRACE_BUFFERS, (TSTR(" %d "), dev->temp_buffer[i].line));
228 T(YAFFS_TRACE_BUFFERS, (TSTR(" " TENDSTR)));
231 * If we got here then we have to allocate an unmanaged one
235 dev->unmanaged_buffer_allocs++;
236 return YMALLOC(dev->data_bytes_per_chunk);
240 void yaffs_release_temp_buffer(yaffs_dev_t *dev, __u8 *buffer,
247 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
248 if (dev->temp_buffer[i].buffer == buffer) {
249 dev->temp_buffer[i].line = 0;
255 /* assume it is an unmanaged one. */
256 T(YAFFS_TRACE_BUFFERS,
257 (TSTR("Releasing unmanaged temp buffer in line %d" TENDSTR),
260 dev->unmanaged_buffer_deallocs++;
266 * Determine if we have a managed buffer.
268 int yaffs_is_managed_tmp_buffer(yaffs_dev_t *dev, const __u8 *buffer)
272 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
273 if (dev->temp_buffer[i].buffer == buffer)
277 for (i = 0; i < dev->param.n_caches; i++) {
278 if (dev->cache[i].data == buffer)
282 if (buffer == dev->checkpt_buffer)
285 T(YAFFS_TRACE_ALWAYS,
286 (TSTR("yaffs: unmaged buffer detected.\n" TENDSTR)));
298 * Simple hash function. Needs to have a reasonable spread
301 static Y_INLINE int yaffs_hash_fn(int n)
304 return n % YAFFS_NOBJECT_BUCKETS;
308 * Access functions to useful fake objects.
309 * Note that root might have a presence in NAND if permissions are set.
312 yaffs_obj_t *yaffs_root(yaffs_dev_t *dev)
314 return dev->root_dir;
317 yaffs_obj_t *yaffs_lost_n_found(yaffs_dev_t *dev)
319 return dev->lost_n_found;
324 * Erased NAND checking functions
327 int yaffs_check_ff(__u8 *buffer, int n_bytes)
329 /* Horrible, slow implementation */
338 static int yaffs_check_chunk_erased(struct yaffs_dev_s *dev,
341 int retval = YAFFS_OK;
342 __u8 *data = yaffs_get_temp_buffer(dev, __LINE__);
346 result = yaffs_rd_chunk_tags_nand(dev, nand_chunk, data, &tags);
348 if (tags.ecc_result > YAFFS_ECC_RESULT_NO_ERROR)
351 if (!yaffs_check_ff(data, dev->data_bytes_per_chunk) || tags.chunk_used) {
352 T(YAFFS_TRACE_NANDACCESS,
353 (TSTR("Chunk %d not erased" TENDSTR), nand_chunk));
357 yaffs_release_temp_buffer(dev, data, __LINE__);
364 static int yaffs_verify_chunk_written(yaffs_dev_t *dev,
367 yaffs_ext_tags *tags)
369 int retval = YAFFS_OK;
370 yaffs_ext_tags tempTags;
371 __u8 *buffer = yaffs_get_temp_buffer(dev,__LINE__);
374 result = yaffs_rd_chunk_tags_nand(dev,nand_chunk,buffer,&tempTags);
375 if(memcmp(buffer,data,dev->data_bytes_per_chunk) ||
376 tempTags.obj_id != tags->obj_id ||
377 tempTags.chunk_id != tags->chunk_id ||
378 tempTags.n_bytes != tags->n_bytes)
381 yaffs_release_temp_buffer(dev, buffer, __LINE__);
386 static int yaffs_write_new_chunk(struct yaffs_dev_s *dev,
388 yaffs_ext_tags *tags,
395 yaffs2_checkpt_invalidate(dev);
398 yaffs_block_info_t *bi = 0;
401 chunk = yaffs_alloc_chunk(dev, useReserve, &bi);
407 /* First check this chunk is erased, if it needs
408 * checking. The checking policy (unless forced
409 * always on) is as follows:
411 * Check the first page we try to write in a block.
412 * If the check passes then we don't need to check any
413 * more. If the check fails, we check again...
414 * If the block has been erased, we don't need to check.
416 * However, if the block has been prioritised for gc,
417 * then we think there might be something odd about
418 * this block and stop using it.
420 * Rationale: We should only ever see chunks that have
421 * not been erased if there was a partially written
422 * chunk due to power loss. This checking policy should
423 * catch that case with very few checks and thus save a
424 * lot of checks that are most likely not needed.
427 * If an erase check fails or the write fails we skip the
431 /* let's give it a try */
434 if(dev->param.always_check_erased)
435 bi->skip_erased_check = 0;
437 if (!bi->skip_erased_check) {
438 erasedOk = yaffs_check_chunk_erased(dev, chunk);
439 if (erasedOk != YAFFS_OK) {
441 (TSTR("**>> yaffs chunk %d was not erased"
444 /* If not erased, delete this one,
445 * skip rest of block and
446 * try another chunk */
447 yaffs_chunk_del(dev,chunk,1,__LINE__);
448 yaffs_skip_rest_of_block(dev);
453 writeOk = yaffs_wr_chunk_tags_nand(dev, chunk,
456 if(!bi->skip_erased_check)
457 writeOk = yaffs_verify_chunk_written(dev, chunk, data, tags);
459 if (writeOk != YAFFS_OK) {
460 /* Clean up aborted write, skip to next block and
461 * try another chunk */
462 yaffs_handle_chunk_wr_error(dev, chunk, erasedOk);
466 bi->skip_erased_check = 1;
468 /* Copy the data into the robustification buffer */
469 yaffs_handle_chunk_wr_ok(dev, chunk, data, tags);
471 } while (writeOk != YAFFS_OK &&
472 (yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts));
479 (TSTR("**>> yaffs write required %d attempts" TENDSTR),
482 dev->n_retired_writes += (attempts - 1);
491 * Block retiring for handling a broken block.
494 static void yaffs_retire_block(yaffs_dev_t *dev, int flash_block)
496 yaffs_block_info_t *bi = yaffs_get_block_info(dev, flash_block);
498 yaffs2_checkpt_invalidate(dev);
500 yaffs2_clear_oldest_dirty_seq(dev,bi);
502 if (yaffs_mark_bad(dev, flash_block) != YAFFS_OK) {
503 if (yaffs_erase_block(dev, flash_block) != YAFFS_OK) {
504 T(YAFFS_TRACE_ALWAYS, (TSTR(
505 "yaffs: Failed to mark bad and erase block %d"
506 TENDSTR), flash_block));
509 int chunk_id = flash_block * dev->param.chunks_per_block;
511 __u8 *buffer = yaffs_get_temp_buffer(dev, __LINE__);
513 memset(buffer, 0xff, dev->data_bytes_per_chunk);
514 yaffs_init_tags(&tags);
515 tags.seq_number = YAFFS_SEQUENCE_BAD_BLOCK;
516 if (dev->param.write_chunk_tags_fn(dev, chunk_id -
517 dev->chunk_offset, buffer, &tags) != YAFFS_OK)
518 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Failed to "
519 TCONT("write bad block marker to block %d")
520 TENDSTR), flash_block));
522 yaffs_release_temp_buffer(dev, buffer, __LINE__);
526 bi->block_state = YAFFS_BLOCK_STATE_DEAD;
527 bi->gc_prioritise = 0;
528 bi->needs_retiring = 0;
530 dev->n_retired_blocks++;
534 * Functions for robustisizing TODO
538 static void yaffs_handle_chunk_wr_ok(yaffs_dev_t *dev, int nand_chunk,
540 const yaffs_ext_tags *tags)
543 nand_chunk=nand_chunk;
548 static void yaffs_handle_chunk_update(yaffs_dev_t *dev, int nand_chunk,
549 const yaffs_ext_tags *tags)
552 nand_chunk=nand_chunk;
556 void yaffs_handle_chunk_error(yaffs_dev_t *dev, yaffs_block_info_t *bi)
558 if (!bi->gc_prioritise) {
559 bi->gc_prioritise = 1;
560 dev->has_pending_prioritised_gc = 1;
561 bi->chunk_error_strikes++;
563 if (bi->chunk_error_strikes > 3) {
564 bi->needs_retiring = 1; /* Too many stikes, so retire this */
565 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Block struck out" TENDSTR)));
571 static void yaffs_handle_chunk_wr_error(yaffs_dev_t *dev, int nand_chunk,
574 int flash_block = nand_chunk / dev->param.chunks_per_block;
575 yaffs_block_info_t *bi = yaffs_get_block_info(dev, flash_block);
577 yaffs_handle_chunk_error(dev, bi);
580 /* Was an actual write failure, so mark the block for retirement */
581 bi->needs_retiring = 1;
582 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
583 (TSTR("**>> Block %d needs retiring" TENDSTR), flash_block));
586 /* Delete the chunk */
587 yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
588 yaffs_skip_rest_of_block(dev);
592 /*---------------- Name handling functions ------------*/
594 static __u16 yaffs_calc_name_sum(const YCHAR *name)
599 const YUCHAR *bname = (const YUCHAR *) name;
601 while ((*bname) && (i < (YAFFS_MAX_NAME_LENGTH/2))) {
603 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
604 sum += yaffs_toupper(*bname) * i;
615 void yaffs_set_obj_name(yaffs_obj_t *obj, const YCHAR *name)
617 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
618 memset(obj->short_name, 0, sizeof(YCHAR) * (YAFFS_SHORT_NAME_LENGTH+1));
619 if (name && yaffs_strnlen(name,YAFFS_SHORT_NAME_LENGTH+1) <= YAFFS_SHORT_NAME_LENGTH)
620 yaffs_strcpy(obj->short_name, name);
622 obj->short_name[0] = _Y('\0');
624 obj->sum = yaffs_calc_name_sum(name);
627 void yaffs_set_obj_name_from_oh(yaffs_obj_t *obj, const yaffs_obj_header *oh)
629 #ifdef CONFIG_YAFFS_AUTO_UNICODE
630 YCHAR tmpName[YAFFS_MAX_NAME_LENGTH+1];
631 memset(tmpName,0,sizeof(tmpName));
632 yaffs_load_name_from_oh(obj->my_dev,tmpName,oh->name,YAFFS_MAX_NAME_LENGTH+1);
633 yaffs_set_obj_name(obj,tmpName);
635 yaffs_set_obj_name(obj,oh->name);
639 /*-------------------- TNODES -------------------
641 * List of spare tnodes
642 * The list is hooked together using the first pointer
647 yaffs_tnode_t *yaffs_get_tnode(yaffs_dev_t *dev)
649 yaffs_tnode_t *tn = yaffs_alloc_raw_tnode(dev);
651 memset(tn, 0, dev->tnode_size);
655 dev->checkpoint_blocks_required = 0; /* force recalculation*/
660 /* FreeTnode frees up a tnode and puts it back on the free list */
661 static void yaffs_free_tnode(yaffs_dev_t *dev, yaffs_tnode_t *tn)
663 yaffs_free_raw_tnode(dev,tn);
665 dev->checkpoint_blocks_required = 0; /* force recalculation*/
668 static void yaffs_deinit_tnodes_and_objs(yaffs_dev_t *dev)
670 yaffs_deinit_raw_tnodes_and_objs(dev);
676 void yaffs_load_tnode_0(yaffs_dev_t *dev, yaffs_tnode_t *tn, unsigned pos,
679 __u32 *map = (__u32 *)tn;
685 pos &= YAFFS_TNODES_LEVEL0_MASK;
686 val >>= dev->chunk_grp_bits;
688 bitInMap = pos * dev->tnode_width;
689 wordInMap = bitInMap / 32;
690 bitInWord = bitInMap & (32 - 1);
692 mask = dev->tnode_mask << bitInWord;
694 map[wordInMap] &= ~mask;
695 map[wordInMap] |= (mask & (val << bitInWord));
697 if (dev->tnode_width > (32 - bitInWord)) {
698 bitInWord = (32 - bitInWord);
700 mask = dev->tnode_mask >> (/*dev->tnode_width -*/ bitInWord);
701 map[wordInMap] &= ~mask;
702 map[wordInMap] |= (mask & (val >> bitInWord));
706 __u32 yaffs_get_group_base(yaffs_dev_t *dev, yaffs_tnode_t *tn,
709 __u32 *map = (__u32 *)tn;
715 pos &= YAFFS_TNODES_LEVEL0_MASK;
717 bitInMap = pos * dev->tnode_width;
718 wordInMap = bitInMap / 32;
719 bitInWord = bitInMap & (32 - 1);
721 val = map[wordInMap] >> bitInWord;
723 if (dev->tnode_width > (32 - bitInWord)) {
724 bitInWord = (32 - bitInWord);
726 val |= (map[wordInMap] << bitInWord);
729 val &= dev->tnode_mask;
730 val <<= dev->chunk_grp_bits;
735 /* ------------------- End of individual tnode manipulation -----------------*/
737 /* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
738 * The look up tree is represented by the top tnode and the number of top_level
739 * in the tree. 0 means only the level 0 tnode is in the tree.
742 /* FindLevel0Tnode finds the level 0 tnode, if one exists. */
743 yaffs_tnode_t *yaffs_find_tnode_0(yaffs_dev_t *dev,
744 yaffs_file_s *file_struct,
747 yaffs_tnode_t *tn = file_struct->top;
749 int requiredTallness;
750 int level = file_struct->top_level;
754 /* Check sane level and chunk Id */
755 if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL)
758 if (chunk_id > YAFFS_MAX_CHUNK_ID)
761 /* First check we're tall enough (ie enough top_level) */
763 i = chunk_id >> YAFFS_TNODES_LEVEL0_BITS;
764 requiredTallness = 0;
766 i >>= YAFFS_TNODES_INTERNAL_BITS;
770 if (requiredTallness > file_struct->top_level)
771 return NULL; /* Not tall enough, so we can't find it */
773 /* Traverse down to level 0 */
774 while (level > 0 && tn) {
775 tn = tn->internal[(chunk_id >>
776 (YAFFS_TNODES_LEVEL0_BITS +
778 YAFFS_TNODES_INTERNAL_BITS)) &
779 YAFFS_TNODES_INTERNAL_MASK];
786 /* AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.
787 * This happens in two steps:
788 * 1. If the tree isn't tall enough, then make it taller.
789 * 2. Scan down the tree towards the level 0 tnode adding tnodes if required.
791 * Used when modifying the tree.
793 * If the tn argument is NULL, then a fresh tnode will be added otherwise the specified tn will
794 * be plugged into the ttree.
797 yaffs_tnode_t *yaffs_add_find_tnode_0(yaffs_dev_t *dev,
798 yaffs_file_s *file_struct,
800 yaffs_tnode_t *passed_tn)
802 int requiredTallness;
810 /* Check sane level and page Id */
811 if (file_struct->top_level < 0 || file_struct->top_level > YAFFS_TNODES_MAX_LEVEL)
814 if (chunk_id > YAFFS_MAX_CHUNK_ID)
817 /* First check we're tall enough (ie enough top_level) */
819 x = chunk_id >> YAFFS_TNODES_LEVEL0_BITS;
820 requiredTallness = 0;
822 x >>= YAFFS_TNODES_INTERNAL_BITS;
827 if (requiredTallness > file_struct->top_level) {
828 /* Not tall enough, gotta make the tree taller */
829 for (i = file_struct->top_level; i < requiredTallness; i++) {
831 tn = yaffs_get_tnode(dev);
834 tn->internal[0] = file_struct->top;
835 file_struct->top = tn;
836 file_struct->top_level++;
839 (TSTR("yaffs: no more tnodes" TENDSTR)));
845 /* Traverse down to level 0, adding anything we need */
847 l = file_struct->top_level;
848 tn = file_struct->top;
851 while (l > 0 && tn) {
853 (YAFFS_TNODES_LEVEL0_BITS +
854 (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
855 YAFFS_TNODES_INTERNAL_MASK;
858 if ((l > 1) && !tn->internal[x]) {
859 /* Add missing non-level-zero tnode */
860 tn->internal[x] = yaffs_get_tnode(dev);
864 /* Looking from level 1 at level 0 */
866 /* If we already have one, then release it.*/
868 yaffs_free_tnode(dev, tn->internal[x]);
869 tn->internal[x] = passed_tn;
871 } else if (!tn->internal[x]) {
872 /* Don't have one, none passed in */
873 tn->internal[x] = yaffs_get_tnode(dev);
879 tn = tn->internal[x];
885 memcpy(tn, passed_tn, (dev->tnode_width * YAFFS_NTNODES_LEVEL0)/8);
886 yaffs_free_tnode(dev, passed_tn);
893 static int yaffs_find_chunk_in_group(yaffs_dev_t *dev, int theChunk,
894 yaffs_ext_tags *tags, int obj_id,
899 for (j = 0; theChunk && j < dev->chunk_grp_size; j++) {
900 if (yaffs_check_chunk_bit(dev, theChunk / dev->param.chunks_per_block,
901 theChunk % dev->param.chunks_per_block)) {
903 if(dev->chunk_grp_size == 1)
906 yaffs_rd_chunk_tags_nand(dev, theChunk, NULL,
908 if (yaffs_tags_match(tags, obj_id, inode_chunk)) {
920 /* Experimental code not being used yet. Might speed up file deletion */
921 /* DeleteWorker scans backwards through the tnode tree and deletes all the
922 * chunks and tnodes in the file.
923 * Returns 1 if the tree was deleted.
924 * Returns 0 if it stopped early due to hitting the limit and the delete is incomplete.
927 static int yaffs_del_worker(yaffs_obj_t *in, yaffs_tnode_t *tn, __u32 level,
928 int chunk_offset, int *limit)
935 yaffs_dev_t *dev = in->my_dev;
941 for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
943 if (tn->internal[i]) {
944 if (limit && (*limit) < 0) {
956 YAFFS_TNODES_INTERNAL_BITS)
961 yaffs_free_tnode(dev,
964 tn->internal[i] = NULL;
968 return (allDone) ? 1 : 0;
969 } else if (level == 0) {
972 for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0 && !hitLimit;
974 theChunk = yaffs_get_group_base(dev, tn, i);
977 inode_chunk = (chunk_offset <<
978 YAFFS_TNODES_LEVEL0_BITS) + i;
981 yaffs_find_chunk_in_group(dev,
987 if (foundChunk > 0) {
1000 yaffs_load_tnode_0(dev, tn, i, 0);
1004 return (i < 0) ? 1 : 0;
1016 static void yaffs_soft_del_chunk(yaffs_dev_t *dev, int chunk)
1018 yaffs_block_info_t *theBlock;
1021 T(YAFFS_TRACE_DELETION, (TSTR("soft delete chunk %d" TENDSTR), chunk));
1023 block_no = chunk / dev->param.chunks_per_block;
1024 theBlock = yaffs_get_block_info(dev, block_no);
1026 theBlock->soft_del_pages++;
1027 dev->n_free_chunks++;
1028 yaffs2_update_oldest_dirty_seq(dev, block_no, theBlock);
1032 /* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
1033 * All soft deleting does is increment the block's softdelete count and pulls the chunk out
1035 * Thus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
1038 static int yaffs_soft_del_worker(yaffs_obj_t *in, yaffs_tnode_t *tn,
1039 __u32 level, int chunk_offset)
1044 yaffs_dev_t *dev = in->my_dev;
1049 for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
1051 if (tn->internal[i]) {
1053 yaffs_soft_del_worker(in,
1059 YAFFS_TNODES_INTERNAL_BITS)
1062 yaffs_free_tnode(dev,
1065 tn->internal[i] = NULL;
1067 /* Hoosterman... how could this happen? */
1071 return (allDone) ? 1 : 0;
1072 } else if (level == 0) {
1074 for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
1075 theChunk = yaffs_get_group_base(dev, tn, i);
1077 /* Note this does not find the real chunk, only the chunk group.
1078 * We make an assumption that a chunk group is not larger than
1081 yaffs_soft_del_chunk(dev, theChunk);
1082 yaffs_load_tnode_0(dev, tn, i, 0);
1096 static void yaffs_soft_del_file(yaffs_obj_t *obj)
1099 obj->variant_type == YAFFS_OBJECT_TYPE_FILE && !obj->soft_del) {
1100 if (obj->n_data_chunks <= 0) {
1101 /* Empty file with no duplicate object headers, just delete it immediately */
1102 yaffs_free_tnode(obj->my_dev,
1103 obj->variant.file_variant.top);
1104 obj->variant.file_variant.top = NULL;
1105 T(YAFFS_TRACE_TRACING,
1106 (TSTR("yaffs: Deleting empty file %d" TENDSTR),
1108 yaffs_generic_obj_del(obj);
1110 yaffs_soft_del_worker(obj,
1111 obj->variant.file_variant.top,
1112 obj->variant.file_variant.
1119 /* Pruning removes any part of the file structure tree that is beyond the
1120 * bounds of the file (ie that does not point to chunks).
1122 * A file should only get pruned when its size is reduced.
1124 * Before pruning, the chunks must be pulled from the tree and the
1125 * level 0 tnode entries must be zeroed out.
1126 * Could also use this for file deletion, but that's probably better handled
1127 * by a special case.
1129 * This function is recursive. For levels > 0 the function is called again on
1130 * any sub-tree. For level == 0 we just check if the sub-tree has data.
1131 * If there is no data in a subtree then it is pruned.
1134 static yaffs_tnode_t *yaffs_prune_worker(yaffs_dev_t *dev, yaffs_tnode_t *tn,
1135 __u32 level, int del0)
1144 for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
1145 if (tn->internal[i]) {
1147 yaffs_prune_worker(dev, tn->internal[i],
1149 (i == 0) ? del0 : 1);
1152 if (tn->internal[i])
1156 int tnode_size_u32 = dev->tnode_size/sizeof(__u32);
1157 __u32 *map = (__u32 *)tn;
1159 for(i = 0; !hasData && i < tnode_size_u32; i++){
1165 if (hasData == 0 && del0) {
1166 /* Free and return NULL */
1168 yaffs_free_tnode(dev, tn);
1178 static int yaffs_prune_tree(yaffs_dev_t *dev,
1179 yaffs_file_s *file_struct)
1186 if (file_struct->top_level > 0) {
1188 yaffs_prune_worker(dev, file_struct->top, file_struct->top_level, 0);
1190 /* Now we have a tree with all the non-zero branches NULL but the height
1191 * is the same as it was.
1192 * Let's see if we can trim internal tnodes to shorten the tree.
1193 * We can do this if only the 0th element in the tnode is in use
1194 * (ie all the non-zero are NULL)
1197 while (file_struct->top_level && !done) {
1198 tn = file_struct->top;
1201 for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
1202 if (tn->internal[i])
1207 file_struct->top = tn->internal[0];
1208 file_struct->top_level--;
1209 yaffs_free_tnode(dev, tn);
1219 /*-------------------- End of File Structure functions.-------------------*/
1222 /* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */
1223 static yaffs_obj_t *yaffs_alloc_empty_obj(yaffs_dev_t *dev)
1225 yaffs_obj_t *obj = yaffs_alloc_raw_obj(dev);
1230 /* Now sweeten it up... */
1232 memset(obj, 0, sizeof(yaffs_obj_t));
1233 obj->being_created = 1;
1237 obj->variant_type = YAFFS_OBJECT_TYPE_UNKNOWN;
1238 YINIT_LIST_HEAD(&(obj->hard_links));
1239 YINIT_LIST_HEAD(&(obj->hash_link));
1240 YINIT_LIST_HEAD(&obj->siblings);
1243 /* Now make the directory sane */
1244 if (dev->root_dir) {
1245 obj->parent = dev->root_dir;
1246 ylist_add(&(obj->siblings), &dev->root_dir->variant.dir_variant.children);
1249 /* Add it to the lost and found directory.
1250 * NB Can't put root or lostNFound in lostNFound so
1251 * check if lostNFound exists first
1253 if (dev->lost_n_found)
1254 yaffs_add_obj_to_dir(dev->lost_n_found, obj);
1256 obj->being_created = 0;
1259 dev->checkpoint_blocks_required = 0; /* force recalculation*/
1264 static yaffs_obj_t *yaffs_create_fake_dir(yaffs_dev_t *dev, int number,
1269 yaffs_new_obj(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
1271 obj->fake = 1; /* it is fake so it might have no NAND presence... */
1272 obj->rename_allowed = 0; /* ... and we're not allowed to rename it... */
1273 obj->unlink_allowed = 0; /* ... or unlink it */
1276 obj->yst_mode = mode;
1278 obj->hdr_chunk = 0; /* Not a valid chunk. */
1285 static void yaffs_unhash_obj(yaffs_obj_t *obj)
1288 yaffs_dev_t *dev = obj->my_dev;
1290 /* If it is still linked into the bucket list, free from the list */
1291 if (!ylist_empty(&obj->hash_link)) {
1292 ylist_del_init(&obj->hash_link);
1293 bucket = yaffs_hash_fn(obj->obj_id);
1294 dev->obj_bucket[bucket].count--;
1298 /* FreeObject frees up a Object and puts it back on the free list */
1299 static void yaffs_free_obj(yaffs_obj_t *obj)
1301 yaffs_dev_t *dev = obj->my_dev;
1303 T(YAFFS_TRACE_OS, (TSTR("FreeObject %p inode %p"TENDSTR), obj, obj->my_inode));
1309 if (!ylist_empty(&obj->siblings))
1313 if (obj->my_inode) {
1314 /* We're still hooked up to a cached inode.
1315 * Don't delete now, but mark for later deletion
1317 obj->defered_free = 1;
1321 yaffs_unhash_obj(obj);
1323 yaffs_free_raw_obj(dev,obj);
1325 dev->checkpoint_blocks_required = 0; /* force recalculation*/
1329 void yaffs_handle_defered_free(yaffs_obj_t *obj)
1331 if (obj->defered_free)
1332 yaffs_free_obj(obj);
1335 static void yaffs_init_tnodes_and_objs(yaffs_dev_t *dev)
1342 yaffs_init_raw_tnodes_and_objs(dev);
1344 for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
1345 YINIT_LIST_HEAD(&dev->obj_bucket[i].list);
1346 dev->obj_bucket[i].count = 0;
1350 static int yaffs_find_nice_bucket(yaffs_dev_t *dev)
1354 int lowest = 999999;
1357 /* Search for the shortest list or one that
1361 for (i = 0; i < 10 && lowest > 4; i++) {
1362 dev->bucket_finder++;
1363 dev->bucket_finder %= YAFFS_NOBJECT_BUCKETS;
1364 if (dev->obj_bucket[dev->bucket_finder].count < lowest) {
1365 lowest = dev->obj_bucket[dev->bucket_finder].count;
1366 l = dev->bucket_finder;
1374 static int yaffs_new_obj_id(yaffs_dev_t *dev)
1376 int bucket = yaffs_find_nice_bucket(dev);
1378 /* Now find an object value that has not already been taken
1379 * by scanning the list.
1383 struct ylist_head *i;
1385 __u32 n = (__u32) bucket;
1387 /* yaffs_check_obj_hash_sane(); */
1391 n += YAFFS_NOBJECT_BUCKETS;
1392 if (1 || dev->obj_bucket[bucket].count > 0) {
1393 ylist_for_each(i, &dev->obj_bucket[bucket].list) {
1394 /* If there is already one in the list */
1395 if (i && ylist_entry(i, yaffs_obj_t,
1396 hash_link)->obj_id == n) {
1406 static void yaffs_hash_obj(yaffs_obj_t *in)
1408 int bucket = yaffs_hash_fn(in->obj_id);
1409 yaffs_dev_t *dev = in->my_dev;
1411 ylist_add(&in->hash_link, &dev->obj_bucket[bucket].list);
1412 dev->obj_bucket[bucket].count++;
1415 yaffs_obj_t *yaffs_find_by_number(yaffs_dev_t *dev, __u32 number)
1417 int bucket = yaffs_hash_fn(number);
1418 struct ylist_head *i;
1421 ylist_for_each(i, &dev->obj_bucket[bucket].list) {
1422 /* Look if it is in the list */
1424 in = ylist_entry(i, yaffs_obj_t, hash_link);
1425 if (in->obj_id == number) {
1427 /* Don't tell the VFS about this one if it is defered free */
1428 if (in->defered_free)
1439 yaffs_obj_t *yaffs_new_obj(yaffs_dev_t *dev, int number,
1440 yaffs_obj_type type)
1442 yaffs_obj_t *theObject=NULL;
1443 yaffs_tnode_t *tn = NULL;
1446 number = yaffs_new_obj_id(dev);
1448 if (type == YAFFS_OBJECT_TYPE_FILE) {
1449 tn = yaffs_get_tnode(dev);
1454 theObject = yaffs_alloc_empty_obj(dev);
1457 yaffs_free_tnode(dev,tn);
1463 theObject->fake = 0;
1464 theObject->rename_allowed = 1;
1465 theObject->unlink_allowed = 1;
1466 theObject->obj_id = number;
1467 yaffs_hash_obj(theObject);
1468 theObject->variant_type = type;
1469 #ifdef CONFIG_YAFFS_WINCE
1470 yfsd_win_file_time_now(theObject->win_atime);
1471 theObject->win_ctime[0] = theObject->win_mtime[0] =
1472 theObject->win_atime[0];
1473 theObject->win_ctime[1] = theObject->win_mtime[1] =
1474 theObject->win_atime[1];
1478 theObject->yst_atime = theObject->yst_mtime =
1479 theObject->yst_ctime = Y_CURRENT_TIME;
1482 case YAFFS_OBJECT_TYPE_FILE:
1483 theObject->variant.file_variant.file_size = 0;
1484 theObject->variant.file_variant.scanned_size = 0;
1485 theObject->variant.file_variant.shrink_size = 0xFFFFFFFF; /* max __u32 */
1486 theObject->variant.file_variant.top_level = 0;
1487 theObject->variant.file_variant.top = tn;
1489 case YAFFS_OBJECT_TYPE_DIRECTORY:
1490 YINIT_LIST_HEAD(&theObject->variant.dir_variant.
1492 YINIT_LIST_HEAD(&theObject->variant.dir_variant.
1495 case YAFFS_OBJECT_TYPE_SYMLINK:
1496 case YAFFS_OBJECT_TYPE_HARDLINK:
1497 case YAFFS_OBJECT_TYPE_SPECIAL:
1498 /* No action required */
1500 case YAFFS_OBJECT_TYPE_UNKNOWN:
1501 /* todo this should not happen */
1509 yaffs_obj_t *yaffs_find_or_create_by_number(yaffs_dev_t *dev,
1511 yaffs_obj_type type)
1513 yaffs_obj_t *theObject = NULL;
1516 theObject = yaffs_find_by_number(dev, number);
1519 theObject = yaffs_new_obj(dev, number, type);
1526 YCHAR *yaffs_clone_str(const YCHAR *str)
1528 YCHAR *newStr = NULL;
1534 len = yaffs_strnlen(str,YAFFS_MAX_ALIAS_LENGTH);
1535 newStr = YMALLOC((len + 1) * sizeof(YCHAR));
1537 yaffs_strncpy(newStr, str,len);
1545 * Mknod (create) a new object.
1546 * equiv_obj only has meaning for a hard link;
1547 * aliasString only has meaning for a symlink.
1548 * rdev only has meaning for devices (a subset of special objects)
1551 static yaffs_obj_t *yaffs_create_obj(yaffs_obj_type type,
1552 yaffs_obj_t *parent,
1557 yaffs_obj_t *equiv_obj,
1558 const YCHAR *aliasString, __u32 rdev)
1563 yaffs_dev_t *dev = parent->my_dev;
1565 /* Check if the entry exists. If it does then fail the call since we don't want a dup.*/
1566 if (yaffs_find_by_name(parent, name))
1569 if (type == YAFFS_OBJECT_TYPE_SYMLINK) {
1570 str = yaffs_clone_str(aliasString);
1575 in = yaffs_new_obj(dev, -1, type);
1590 in->variant_type = type;
1592 in->yst_mode = mode;
1594 #ifdef CONFIG_YAFFS_WINCE
1595 yfsd_win_file_time_now(in->win_atime);
1596 in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
1597 in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1];
1600 in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME;
1602 in->yst_rdev = rdev;
1606 in->n_data_chunks = 0;
1608 yaffs_set_obj_name(in, name);
1611 yaffs_add_obj_to_dir(parent, in);
1613 in->my_dev = parent->my_dev;
1616 case YAFFS_OBJECT_TYPE_SYMLINK:
1617 in->variant.symlink_variant.alias = str;
1619 case YAFFS_OBJECT_TYPE_HARDLINK:
1620 in->variant.hardlink_variant.equiv_obj =
1622 in->variant.hardlink_variant.equiv_id =
1624 ylist_add(&in->hard_links, &equiv_obj->hard_links);
1626 case YAFFS_OBJECT_TYPE_FILE:
1627 case YAFFS_OBJECT_TYPE_DIRECTORY:
1628 case YAFFS_OBJECT_TYPE_SPECIAL:
1629 case YAFFS_OBJECT_TYPE_UNKNOWN:
1634 if (yaffs_update_oh(in, name, 0, 0, 0, NULL) < 0) {
1635 /* Could not create the object header, fail the creation */
1640 yaffs_update_parent(parent);
1646 yaffs_obj_t *yaffs_create_file(yaffs_obj_t *parent, const YCHAR *name,
1647 __u32 mode, __u32 uid, __u32 gid)
1649 return yaffs_create_obj(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
1650 uid, gid, NULL, NULL, 0);
1653 yaffs_obj_t *yaffs_create_dir(yaffs_obj_t *parent, const YCHAR *name,
1654 __u32 mode, __u32 uid, __u32 gid)
1656 return yaffs_create_obj(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
1657 mode, uid, gid, NULL, NULL, 0);
1660 yaffs_obj_t *yaffs_create_special(yaffs_obj_t *parent, const YCHAR *name,
1661 __u32 mode, __u32 uid, __u32 gid, __u32 rdev)
1663 return yaffs_create_obj(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
1664 uid, gid, NULL, NULL, rdev);
1667 yaffs_obj_t *yaffs_create_symlink(yaffs_obj_t *parent, const YCHAR *name,
1668 __u32 mode, __u32 uid, __u32 gid,
1671 return yaffs_create_obj(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
1672 uid, gid, NULL, alias, 0);
1675 /* yaffs_link_obj returns the object id of the equivalent object.*/
1676 yaffs_obj_t *yaffs_link_obj(yaffs_obj_t *parent, const YCHAR *name,
1677 yaffs_obj_t *equiv_obj)
1679 /* Get the real object in case we were fed a hard link as an equivalent object */
1680 equiv_obj = yaffs_get_equivalent_obj(equiv_obj);
1682 if (yaffs_create_obj
1683 (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0,
1684 equiv_obj, NULL, 0)) {
1692 static int yaffs_change_obj_name(yaffs_obj_t *obj, yaffs_obj_t *new_dir,
1693 const YCHAR *new_name, int force, int shadows)
1698 yaffs_obj_t *existingTarget;
1700 if (new_dir == NULL)
1701 new_dir = obj->parent; /* use the old directory */
1703 if (new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
1704 T(YAFFS_TRACE_ALWAYS,
1706 ("tragedy: yaffs_change_obj_name: new_dir is not a directory"
1711 /* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */
1712 if (obj->my_dev->param.is_yaffs2)
1713 unlinkOp = (new_dir == obj->my_dev->unlinked_dir);
1715 unlinkOp = (new_dir == obj->my_dev->unlinked_dir
1716 && obj->variant_type == YAFFS_OBJECT_TYPE_FILE);
1718 deleteOp = (new_dir == obj->my_dev->del_dir);
1720 existingTarget = yaffs_find_by_name(new_dir, new_name);
1722 /* If the object is a file going into the unlinked directory,
1723 * then it is OK to just stuff it in since duplicate names are allowed.
1724 * else only proceed if the new name does not exist and if we're putting
1725 * it into a directory.
1732 new_dir->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) {
1733 yaffs_set_obj_name(obj, new_name);
1736 yaffs_add_obj_to_dir(new_dir, obj);
1741 /* If it is a deletion then we mark it as a shrink for gc purposes. */
1742 if (yaffs_update_oh(obj, new_name, 0, deleteOp, shadows, NULL) >= 0)
1749 int yaffs_rename_obj(yaffs_obj_t *old_dir, const YCHAR *old_name,
1750 yaffs_obj_t *new_dir, const YCHAR *new_name)
1752 yaffs_obj_t *obj = NULL;
1753 yaffs_obj_t *existingTarget = NULL;
1759 if (!old_dir || old_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
1761 if (!new_dir || new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
1764 dev = old_dir->my_dev;
1766 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
1767 /* Special case for case insemsitive systems (eg. WinCE).
1768 * While look-up is case insensitive, the name isn't.
1769 * Therefore we might want to change x.txt to X.txt
1771 if (old_dir == new_dir && yaffs_strcmp(old_name, new_name) == 0)
1775 if(yaffs_strnlen(new_name,YAFFS_MAX_NAME_LENGTH+1) > YAFFS_MAX_NAME_LENGTH)
1779 obj = yaffs_find_by_name(old_dir, old_name);
1781 if (obj && obj->rename_allowed) {
1783 /* Now do the handling for an existing target, if there is one */
1785 existingTarget = yaffs_find_by_name(new_dir, new_name);
1786 if (existingTarget &&
1787 existingTarget->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY &&
1788 !ylist_empty(&existingTarget->variant.dir_variant.children)) {
1789 /* There is a target that is a non-empty directory, so we fail */
1790 return YAFFS_FAIL; /* EEXIST or ENOTEMPTY */
1791 } else if (existingTarget && existingTarget != obj) {
1792 /* Nuke the target first, using shadowing,
1793 * but only if it isn't the same object.
1795 * Note we must disable gc otherwise it can mess up the shadowing.
1799 yaffs_change_obj_name(obj, new_dir, new_name, force,
1800 existingTarget->obj_id);
1801 existingTarget->is_shadowed = 1;
1802 yaffs_unlink_obj(existingTarget);
1806 result = yaffs_change_obj_name(obj, new_dir, new_name, 1, 0);
1808 yaffs_update_parent(old_dir);
1809 if(new_dir != old_dir)
1810 yaffs_update_parent(new_dir);
1817 /*------------------------- Block Management and Page Allocation ----------------*/
1819 static int yaffs_init_blocks(yaffs_dev_t *dev)
1821 int nBlocks = dev->internal_end_block - dev->internal_start_block + 1;
1823 dev->block_info = NULL;
1824 dev->chunk_bits = NULL;
1826 dev->alloc_block = -1; /* force it to get a new one */
1828 /* If the first allocation strategy fails, thry the alternate one */
1829 dev->block_info = YMALLOC(nBlocks * sizeof(yaffs_block_info_t));
1830 if (!dev->block_info) {
1831 dev->block_info = YMALLOC_ALT(nBlocks * sizeof(yaffs_block_info_t));
1832 dev->block_info_alt = 1;
1834 dev->block_info_alt = 0;
1836 if (dev->block_info) {
1837 /* Set up dynamic blockinfo stuff. */
1838 dev->chunk_bit_stride = (dev->param.chunks_per_block + 7) / 8; /* round up bytes */
1839 dev->chunk_bits = YMALLOC(dev->chunk_bit_stride * nBlocks);
1840 if (!dev->chunk_bits) {
1841 dev->chunk_bits = YMALLOC_ALT(dev->chunk_bit_stride * nBlocks);
1842 dev->chunk_bits_alt = 1;
1844 dev->chunk_bits_alt = 0;
1847 if (dev->block_info && dev->chunk_bits) {
1848 memset(dev->block_info, 0, nBlocks * sizeof(yaffs_block_info_t));
1849 memset(dev->chunk_bits, 0, dev->chunk_bit_stride * nBlocks);
1856 static void yaffs_deinit_blocks(yaffs_dev_t *dev)
1858 if (dev->block_info_alt && dev->block_info)
1859 YFREE_ALT(dev->block_info);
1860 else if (dev->block_info)
1861 YFREE(dev->block_info);
1863 dev->block_info_alt = 0;
1865 dev->block_info = NULL;
1867 if (dev->chunk_bits_alt && dev->chunk_bits)
1868 YFREE_ALT(dev->chunk_bits);
1869 else if (dev->chunk_bits)
1870 YFREE(dev->chunk_bits);
1871 dev->chunk_bits_alt = 0;
1872 dev->chunk_bits = NULL;
1875 void yaffs_block_became_dirty(yaffs_dev_t *dev, int block_no)
1877 yaffs_block_info_t *bi = yaffs_get_block_info(dev, block_no);
1881 /* If the block is still healthy erase it and mark as clean.
1882 * If the block has had a data failure, then retire it.
1885 T(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
1886 (TSTR("yaffs_block_became_dirty block %d state %d %s"TENDSTR),
1887 block_no, bi->block_state, (bi->needs_retiring) ? "needs retiring" : ""));
1889 yaffs2_clear_oldest_dirty_seq(dev,bi);
1891 bi->block_state = YAFFS_BLOCK_STATE_DIRTY;
1893 /* If this is the block being garbage collected then stop gc'ing this block */
1894 if(block_no == dev->gc_block)
1897 /* If this block is currently the best candidate for gc then drop as a candidate */
1898 if(block_no == dev->gc_dirtiest){
1899 dev->gc_dirtiest = 0;
1900 dev->gc_pages_in_use = 0;
1903 if (!bi->needs_retiring) {
1904 yaffs2_checkpt_invalidate(dev);
1905 erasedOk = yaffs_erase_block(dev, block_no);
1907 dev->n_erase_failures++;
1908 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
1909 (TSTR("**>> Erasure failed %d" TENDSTR), block_no));
1914 ((yaffs_trace_mask & YAFFS_TRACE_ERASE) || !yaffs_skip_verification(dev))) {
1916 for (i = 0; i < dev->param.chunks_per_block; i++) {
1917 if (!yaffs_check_chunk_erased
1918 (dev, block_no * dev->param.chunks_per_block + i)) {
1919 T(YAFFS_TRACE_ERROR,
1921 (">>Block %d erasure supposedly OK, but chunk %d not erased"
1922 TENDSTR), block_no, i));
1928 /* Clean it up... */
1929 bi->block_state = YAFFS_BLOCK_STATE_EMPTY;
1931 dev->n_erased_blocks++;
1932 bi->pages_in_use = 0;
1933 bi->soft_del_pages = 0;
1934 bi->has_shrink_hdr = 0;
1935 bi->skip_erased_check = 1; /* This is clean, so no need to check */
1936 bi->gc_prioritise = 0;
1937 yaffs_clear_chunk_bits(dev, block_no);
1939 T(YAFFS_TRACE_ERASE,
1940 (TSTR("Erased block %d" TENDSTR), block_no));
1942 dev->n_free_chunks -= dev->param.chunks_per_block; /* We lost a block of free space */
1944 yaffs_retire_block(dev, block_no);
1945 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
1946 (TSTR("**>> Block %d retired" TENDSTR), block_no));
1950 static int yaffs_find_alloc_block(yaffs_dev_t *dev)
1954 yaffs_block_info_t *bi;
1956 if (dev->n_erased_blocks < 1) {
1957 /* Hoosterman we've got a problem.
1958 * Can't get space to gc
1960 T(YAFFS_TRACE_ERROR,
1961 (TSTR("yaffs tragedy: no more erased blocks" TENDSTR)));
1966 /* Find an empty block. */
1968 for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
1969 dev->alloc_block_finder++;
1970 if (dev->alloc_block_finder < dev->internal_start_block
1971 || dev->alloc_block_finder > dev->internal_end_block) {
1972 dev->alloc_block_finder = dev->internal_start_block;
1975 bi = yaffs_get_block_info(dev, dev->alloc_block_finder);
1977 if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) {
1978 bi->block_state = YAFFS_BLOCK_STATE_ALLOCATING;
1980 bi->seq_number = dev->seq_number;
1981 dev->n_erased_blocks--;
1982 T(YAFFS_TRACE_ALLOCATE,
1983 (TSTR("Allocated block %d, seq %d, %d left" TENDSTR),
1984 dev->alloc_block_finder, dev->seq_number,
1985 dev->n_erased_blocks));
1986 return dev->alloc_block_finder;
1990 T(YAFFS_TRACE_ALWAYS,
1992 ("yaffs tragedy: no more erased blocks, but there should have been %d"
1993 TENDSTR), dev->n_erased_blocks));
2000 * Check if there's space to allocate...
2001 * Thinks.... do we need top make this ths same as yaffs_get_free_chunks()?
2003 int yaffs_check_alloc_available(yaffs_dev_t *dev, int n_chunks)
2006 int reservedBlocks = dev->param.n_reserved_blocks;
2007 int checkpointBlocks;
2009 checkpointBlocks = yaffs_calc_checkpt_blocks_required(dev);
2011 reservedChunks = ((reservedBlocks + checkpointBlocks) * dev->param.chunks_per_block);
2013 return (dev->n_free_chunks > (reservedChunks + n_chunks));
2016 static int yaffs_alloc_chunk(yaffs_dev_t *dev, int useReserve,
2017 yaffs_block_info_t **blockUsedPtr)
2020 yaffs_block_info_t *bi;
2022 if (dev->alloc_block < 0) {
2023 /* Get next block to allocate off */
2024 dev->alloc_block = yaffs_find_alloc_block(dev);
2025 dev->alloc_page = 0;
2028 if (!useReserve && !yaffs_check_alloc_available(dev, 1)) {
2029 /* Not enough space to allocate unless we're allowed to use the reserve. */
2033 if (dev->n_erased_blocks < dev->param.n_reserved_blocks
2034 && dev->alloc_page == 0) {
2035 T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR)));
2038 /* Next page please.... */
2039 if (dev->alloc_block >= 0) {
2040 bi = yaffs_get_block_info(dev, dev->alloc_block);
2042 retVal = (dev->alloc_block * dev->param.chunks_per_block) +
2045 yaffs_set_chunk_bit(dev, dev->alloc_block,
2050 dev->n_free_chunks--;
2052 /* If the block is full set the state to full */
2053 if (dev->alloc_page >= dev->param.chunks_per_block) {
2054 bi->block_state = YAFFS_BLOCK_STATE_FULL;
2055 dev->alloc_block = -1;
2064 T(YAFFS_TRACE_ERROR,
2065 (TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
2070 static int yaffs_get_erased_chunks(yaffs_dev_t *dev)
2074 n = dev->n_erased_blocks * dev->param.chunks_per_block;
2076 if (dev->alloc_block > 0)
2077 n += (dev->param.chunks_per_block - dev->alloc_page);
2084 * yaffs_skip_rest_of_block() skips over the rest of the allocation block
2085 * if we don't want to write to it.
2087 void yaffs_skip_rest_of_block(yaffs_dev_t *dev)
2089 if(dev->alloc_block > 0){
2090 yaffs_block_info_t *bi = yaffs_get_block_info(dev, dev->alloc_block);
2091 if(bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING){
2092 bi->block_state = YAFFS_BLOCK_STATE_FULL;
2093 dev->alloc_block = -1;
2099 static int yaffs_gc_block(yaffs_dev_t *dev, int block,
2105 int retVal = YAFFS_OK;
2107 int isCheckpointBlock;
2111 int chunksBefore = yaffs_get_erased_chunks(dev);
2114 yaffs_ext_tags tags;
2116 yaffs_block_info_t *bi = yaffs_get_block_info(dev, block);
2118 yaffs_obj_t *object;
2120 isCheckpointBlock = (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT);
2123 T(YAFFS_TRACE_TRACING,
2124 (TSTR("Collecting block %d, in use %d, shrink %d, wholeBlock %d" TENDSTR),
2130 /*yaffs_verify_free_chunks(dev); */
2132 if(bi->block_state == YAFFS_BLOCK_STATE_FULL)
2133 bi->block_state = YAFFS_BLOCK_STATE_COLLECTING;
2135 bi->has_shrink_hdr = 0; /* clear the flag so that the block can erase */
2137 dev->gc_disable = 1;
2139 if (isCheckpointBlock ||
2140 !yaffs_still_some_chunks(dev, block)) {
2141 T(YAFFS_TRACE_TRACING,
2143 ("Collecting block %d that has no chunks in use" TENDSTR),
2145 yaffs_block_became_dirty(dev, block);
2148 __u8 *buffer = yaffs_get_temp_buffer(dev, __LINE__);
2150 yaffs_verify_blk(dev, bi, block);
2152 maxCopies = (wholeBlock) ? dev->param.chunks_per_block : 5;
2153 oldChunk = block * dev->param.chunks_per_block + dev->gc_chunk;
2155 for (/* init already done */;
2156 retVal == YAFFS_OK &&
2157 dev->gc_chunk < dev->param.chunks_per_block &&
2158 (bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) &&
2160 dev->gc_chunk++, oldChunk++) {
2161 if (yaffs_check_chunk_bit(dev, block, dev->gc_chunk)) {
2163 /* This page is in use and might need to be copied off */
2169 yaffs_init_tags(&tags);
2171 yaffs_rd_chunk_tags_nand(dev, oldChunk,
2175 yaffs_find_by_number(dev,
2178 T(YAFFS_TRACE_GC_DETAIL,
2180 ("Collecting chunk in block %d, %d %d %d " TENDSTR),
2181 dev->gc_chunk, tags.obj_id, tags.chunk_id,
2184 if (object && !yaffs_skip_verification(dev)) {
2185 if (tags.chunk_id == 0)
2186 matchingChunk = object->hdr_chunk;
2187 else if (object->soft_del)
2188 matchingChunk = oldChunk; /* Defeat the test */
2190 matchingChunk = yaffs_find_chunk_in_file(object, tags.chunk_id, NULL);
2192 if (oldChunk != matchingChunk)
2193 T(YAFFS_TRACE_ERROR,
2194 (TSTR("gc: page in gc mismatch: %d %d %d %d"TENDSTR),
2195 oldChunk, matchingChunk, tags.obj_id, tags.chunk_id));
2200 T(YAFFS_TRACE_ERROR,
2202 ("page %d in gc has no object: %d %d %d "
2204 tags.obj_id, tags.chunk_id, tags.n_bytes));
2210 tags.chunk_id != 0) {
2211 /* Data chunk in a soft deleted file, throw it away
2212 * It's a soft deleted data chunk,
2213 * No need to copy this, just forget about it and
2214 * fix up the object.
2217 /* Free chunks already includes softdeleted chunks.
2218 * How ever this chunk is going to soon be really deleted
2219 * which will increment free chunks.
2220 * We have to decrement free chunks so this works out properly.
2222 dev->n_free_chunks--;
2223 bi->soft_del_pages--;
2225 object->n_data_chunks--;
2227 if (object->n_data_chunks <= 0) {
2228 /* remeber to clean up the object */
2229 dev->gc_cleanup_list[dev->n_clean_ups] =
2235 /* Todo object && object->deleted && object->n_data_chunks == 0 */
2236 /* Deleted object header with no data chunks.
2237 * Can be discarded and the file deleted.
2239 object->hdr_chunk = 0;
2240 yaffs_free_tnode(object->my_dev,
2243 object->variant.file_variant.top = NULL;
2244 yaffs_generic_obj_del(object);
2246 } else if (object) {
2247 /* It's either a data chunk in a live file or
2248 * an ObjectHeader, so we're interested in it.
2249 * NB Need to keep the ObjectHeaders of deleted files
2250 * until the whole file has been deleted off
2252 tags.serial_number++;
2256 if (tags.chunk_id == 0) {
2257 /* It is an object Id,
2258 * We need to nuke the shrinkheader flags first
2259 * Also need to clean up shadowing.
2260 * We no longer want the shrinkHeader flag since its work is done
2261 * and if it is left in place it will mess up scanning.
2264 yaffs_obj_header *oh;
2265 oh = (yaffs_obj_header *)buffer;
2268 tags.extra_is_shrink = 0;
2270 oh->shadows_obj = 0;
2271 oh->inband_shadowed_obj_id = 0;
2272 tags.extra_shadows = 0;
2274 /* Update file size */
2275 if(object->variant_type == YAFFS_OBJECT_TYPE_FILE){
2276 oh->file_size = object->variant.file_variant.file_size;
2277 tags.extra_length = oh->file_size;
2280 yaffs_verify_oh(object, oh, &tags, 1);
2282 yaffs_write_new_chunk(dev,(__u8 *) oh, &tags, 1);
2285 yaffs_write_new_chunk(dev, buffer, &tags, 1);
2288 retVal = YAFFS_FAIL;
2291 /* Ok, now fix up the Tnodes etc. */
2293 if (tags.chunk_id == 0) {
2295 object->hdr_chunk = newChunk;
2296 object->serial = tags.serial_number;
2298 /* It's a data chunk */
2300 ok = yaffs_put_chunk_in_file
2308 if (retVal == YAFFS_OK)
2309 yaffs_chunk_del(dev, oldChunk, mark_flash, __LINE__);
2314 yaffs_release_temp_buffer(dev, buffer, __LINE__);
2320 yaffs_verify_collected_blk(dev, bi, block);
2324 if (bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) {
2326 * The gc did not complete. Set block state back to FULL
2327 * because checkpointing does not restore gc.
2329 bi->block_state = YAFFS_BLOCK_STATE_FULL;
2331 /* The gc completed. */
2332 /* Do any required cleanups */
2333 for (i = 0; i < dev->n_clean_ups; i++) {
2334 /* Time to delete the file too */
2336 yaffs_find_by_number(dev,
2337 dev->gc_cleanup_list[i]);
2339 yaffs_free_tnode(dev,
2340 object->variant.file_variant.
2342 object->variant.file_variant.top = NULL;
2345 ("yaffs: About to finally delete object %d"
2346 TENDSTR), object->obj_id));
2347 yaffs_generic_obj_del(object);
2348 object->my_dev->n_deleted_files--;
2354 chunksAfter = yaffs_get_erased_chunks(dev);
2355 if (chunksBefore >= chunksAfter) {
2358 ("gc did not increase free chunks before %d after %d"
2359 TENDSTR), chunksBefore, chunksAfter));
2363 dev->n_clean_ups = 0;
2366 dev->gc_disable = 0;
2372 * FindBlockForgarbageCollection is used to select the dirtiest block (or close enough)
2373 * for garbage collection.
2376 static unsigned yaffs_find_gc_block(yaffs_dev_t *dev,
2382 unsigned selected = 0;
2383 int prioritised = 0;
2384 int prioritisedExists = 0;
2385 yaffs_block_info_t *bi;
2388 /* First let's see if we need to grab a prioritised block */
2389 if (dev->has_pending_prioritised_gc && !aggressive) {
2390 dev->gc_dirtiest = 0;
2391 bi = dev->block_info;
2392 for (i = dev->internal_start_block;
2393 i <= dev->internal_end_block && !selected;
2396 if (bi->gc_prioritise) {
2397 prioritisedExists = 1;
2398 if (bi->block_state == YAFFS_BLOCK_STATE_FULL &&
2399 yaffs_block_ok_for_gc(dev, bi)) {
2408 * If there is a prioritised block and none was selected then
2409 * this happened because there is at least one old dirty block gumming
2410 * up the works. Let's gc the oldest dirty block.
2413 if(prioritisedExists &&
2415 dev->oldest_dirty_block > 0)
2416 selected = dev->oldest_dirty_block;
2418 if (!prioritisedExists) /* None found, so we can clear this */
2419 dev->has_pending_prioritised_gc = 0;
2422 /* If we're doing aggressive GC then we are happy to take a less-dirty block, and
2424 * else (we're doing a leasurely gc), then we only bother to do this if the
2425 * block has only a few pages in use.
2430 int nBlocks = dev->internal_end_block - dev->internal_start_block + 1;
2432 threshold = dev->param.chunks_per_block;
2433 iterations = nBlocks;
2438 maxThreshold = dev->param.chunks_per_block/2;
2440 maxThreshold = dev->param.chunks_per_block/8;
2442 if(maxThreshold < YAFFS_GC_PASSIVE_THRESHOLD)
2443 maxThreshold = YAFFS_GC_PASSIVE_THRESHOLD;
2445 threshold = background ?
2446 (dev->gc_not_done + 2) * 2 : 0;
2447 if(threshold <YAFFS_GC_PASSIVE_THRESHOLD)
2448 threshold = YAFFS_GC_PASSIVE_THRESHOLD;
2449 if(threshold > maxThreshold)
2450 threshold = maxThreshold;
2452 iterations = nBlocks / 16 + 1;
2453 if (iterations > 100)
2459 (dev->gc_dirtiest < 1 ||
2460 dev->gc_pages_in_use > YAFFS_GC_GOOD_ENOUGH);
2462 dev->gc_block_finder++;
2463 if (dev->gc_block_finder < dev->internal_start_block ||
2464 dev->gc_block_finder > dev->internal_end_block)
2465 dev->gc_block_finder = dev->internal_start_block;
2467 bi = yaffs_get_block_info(dev, dev->gc_block_finder);
2469 pagesUsed = bi->pages_in_use - bi->soft_del_pages;
2471 if (bi->block_state == YAFFS_BLOCK_STATE_FULL &&
2472 pagesUsed < dev->param.chunks_per_block &&
2473 (dev->gc_dirtiest < 1 || pagesUsed < dev->gc_pages_in_use) &&
2474 yaffs_block_ok_for_gc(dev, bi)) {
2475 dev->gc_dirtiest = dev->gc_block_finder;
2476 dev->gc_pages_in_use = pagesUsed;
2480 if(dev->gc_dirtiest > 0 && dev->gc_pages_in_use <= threshold)
2481 selected = dev->gc_dirtiest;
2485 * If nothing has been selected for a while, try selecting the oldest dirty
2486 * because that's gumming up the works.
2489 if(!selected && dev->param.is_yaffs2 &&
2490 dev->gc_not_done >= ( background ? 10 : 20)){
2491 yaffs2_find_oldest_dirty_seq(dev);
2492 if(dev->oldest_dirty_block > 0) {
2493 selected = dev->oldest_dirty_block;
2494 dev->gc_dirtiest = selected;
2495 dev->oldest_dirty_gc_count++;
2496 bi = yaffs_get_block_info(dev, selected);
2497 dev->gc_pages_in_use = bi->pages_in_use - bi->soft_del_pages;
2499 dev->gc_not_done = 0;
2504 (TSTR("GC Selected block %d with %d free, prioritised:%d" TENDSTR),
2506 dev->param.chunks_per_block - dev->gc_pages_in_use,
2513 dev->gc_dirtiest = 0;
2514 dev->gc_pages_in_use = 0;
2515 dev->gc_not_done = 0;
2516 if(dev->refresh_skip > 0)
2517 dev->refresh_skip--;
2521 (TSTR("GC none: finder %d skip %d threshold %d dirtiest %d using %d oldest %d%s" TENDSTR),
2522 dev->gc_block_finder, dev->gc_not_done,
2524 dev->gc_dirtiest, dev->gc_pages_in_use,
2525 dev->oldest_dirty_block,
2526 background ? " bg" : ""));
2532 /* New garbage collector
2533 * If we're very low on erased blocks then we do aggressive garbage collection
2534 * otherwise we do "leasurely" garbage collection.
2535 * Aggressive gc looks further (whole array) and will accept less dirty blocks.
2536 * Passive gc only inspects smaller areas and will only accept more dirty blocks.
2538 * The idea is to help clear out space in a more spread-out manner.
2539 * Dunno if it really does anything useful.
2541 static int yaffs_check_gc(yaffs_dev_t *dev, int background)
2544 int gcOk = YAFFS_OK;
2548 int checkpointBlockAdjust;
2550 if(dev->param.gc_control &&
2551 (dev->param.gc_control(dev) & 1) == 0)
2554 if (dev->gc_disable) {
2555 /* Bail out so we don't get recursive gc */
2559 /* This loop should pass the first time.
2560 * We'll only see looping here if the collection does not increase space.
2566 checkpointBlockAdjust = yaffs_calc_checkpt_blocks_required(dev);
2568 minErased = dev->param.n_reserved_blocks + checkpointBlockAdjust + 1;
2569 erasedChunks = dev->n_erased_blocks * dev->param.chunks_per_block;
2571 /* If we need a block soon then do aggressive gc.*/
2572 if (dev->n_erased_blocks < minErased)
2575 if(!background && erasedChunks > (dev->n_free_chunks / 4))
2578 if(dev->gc_skip > 20)
2580 if(erasedChunks < dev->n_free_chunks/2 ||
2592 /* If we don't already have a block being gc'd then see if we should start another */
2594 if (dev->gc_block < 1 && !aggressive) {
2595 dev->gc_block = yaffs2_find_refresh_block(dev);
2599 if (dev->gc_block < 1) {
2600 dev->gc_block = yaffs_find_gc_block(dev, aggressive, background);
2605 if (dev->gc_block > 0) {
2608 dev->passive_gc_count++;
2612 ("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),
2613 dev->n_erased_blocks, aggressive));
2615 gcOk = yaffs_gc_block(dev, dev->gc_block, aggressive);
2618 if (dev->n_erased_blocks < (dev->param.n_reserved_blocks) && dev->gc_block > 0) {
2621 ("yaffs: GC !!!no reclaim!!! erasedBlocks %d after try %d block %d"
2622 TENDSTR), dev->n_erased_blocks, maxTries, dev->gc_block));
2624 } while ((dev->n_erased_blocks < dev->param.n_reserved_blocks) &&
2625 (dev->gc_block > 0) &&
2628 return aggressive ? gcOk : YAFFS_OK;
2633 * Garbage collects. Intended to be called from a background thread.
2634 * Returns non-zero if at least half the free chunks are erased.
2636 int yaffs_bg_gc(yaffs_dev_t *dev, unsigned urgency)
2638 int erasedChunks = dev->n_erased_blocks * dev->param.chunks_per_block;
2640 T(YAFFS_TRACE_BACKGROUND, (TSTR("Background gc %u" TENDSTR),urgency));
2642 yaffs_check_gc(dev, 1);
2643 return erasedChunks > dev->n_free_chunks/2;
2646 /*------------------------- TAGS --------------------------------*/
2648 static int yaffs_tags_match(const yaffs_ext_tags *tags, int obj_id,
2651 return (tags->chunk_id == chunkInObject &&
2652 tags->obj_id == obj_id && !tags->is_deleted) ? 1 : 0;
2657 /*-------------------- Data file manipulation -----------------*/
2659 static int yaffs_find_chunk_in_file(yaffs_obj_t *in, int inode_chunk,
2660 yaffs_ext_tags *tags)
2662 /*Get the Tnode, then get the level 0 offset chunk offset */
2665 yaffs_ext_tags localTags;
2668 yaffs_dev_t *dev = in->my_dev;
2671 /* Passed a NULL, so use our own tags space */
2675 tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk);
2678 theChunk = yaffs_get_group_base(dev, tn, inode_chunk);
2681 yaffs_find_chunk_in_group(dev, theChunk, tags, in->obj_id,
2687 static int yaffs_find_del_file_chunk(yaffs_obj_t *in, int inode_chunk,
2688 yaffs_ext_tags *tags)
2690 /* Get the Tnode, then get the level 0 offset chunk offset */
2693 yaffs_ext_tags localTags;
2695 yaffs_dev_t *dev = in->my_dev;
2699 /* Passed a NULL, so use our own tags space */
2703 tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk);
2707 theChunk = yaffs_get_group_base(dev, tn, inode_chunk);
2710 yaffs_find_chunk_in_group(dev, theChunk, tags, in->obj_id,
2713 /* Delete the entry in the filestructure (if found) */
2715 yaffs_load_tnode_0(dev, tn, inode_chunk, 0);
2722 int yaffs_put_chunk_in_file(yaffs_obj_t *in, int inode_chunk,
2723 int nand_chunk, int in_scan)
2725 /* NB in_scan is zero unless scanning.
2726 * For forward scanning, in_scan is > 0;
2727 * for backward scanning in_scan is < 0
2729 * nand_chunk = 0 is a dummy insert to make sure the tnodes are there.
2733 yaffs_dev_t *dev = in->my_dev;
2735 yaffs_ext_tags existingTags;
2736 yaffs_ext_tags newTags;
2737 unsigned existingSerial, newSerial;
2739 if (in->variant_type != YAFFS_OBJECT_TYPE_FILE) {
2740 /* Just ignore an attempt at putting a chunk into a non-file during scanning
2741 * If it is not during Scanning then something went wrong!
2744 T(YAFFS_TRACE_ERROR,
2746 ("yaffs tragedy:attempt to put data chunk into a non-file"
2751 yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
2755 tn = yaffs_add_find_tnode_0(dev,
2756 &in->variant.file_variant,
2763 /* Dummy insert, bail now */
2766 existingChunk = yaffs_get_group_base(dev, tn, inode_chunk);
2769 /* If we're scanning then we need to test for duplicates
2770 * NB This does not need to be efficient since it should only ever
2771 * happen when the power fails during a write, then only one
2772 * chunk should ever be affected.
2774 * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO
2775 * Update: For backward scanning we don't need to re-read tags so this is quite cheap.
2778 if (existingChunk > 0) {
2779 /* NB Right now existing chunk will not be real chunk_id if the chunk group size > 1
2780 * thus we have to do a FindChunkInFile to get the real chunk id.
2782 * We have a duplicate now we need to decide which one to use:
2784 * Backwards scanning YAFFS2: The old one is what we use, dump the new one.
2785 * Forward scanning YAFFS2: The new one is what we use, dump the old one.
2786 * YAFFS1: Get both sets of tags and compare serial numbers.
2790 /* Only do this for forward scanning */
2791 yaffs_rd_chunk_tags_nand(dev,
2795 /* Do a proper find */
2797 yaffs_find_chunk_in_file(in, inode_chunk,
2801 if (existingChunk <= 0) {
2802 /*Hoosterman - how did this happen? */
2804 T(YAFFS_TRACE_ERROR,
2806 ("yaffs tragedy: existing chunk < 0 in scan"
2811 /* NB The deleted flags should be false, otherwise the chunks will
2812 * not be loaded during a scan
2816 newSerial = newTags.serial_number;
2817 existingSerial = existingTags.serial_number;
2820 if ((in_scan > 0) &&
2821 (existingChunk <= 0 ||
2822 ((existingSerial + 1) & 3) == newSerial)) {
2823 /* Forward scanning.
2825 * Delete the old one and drop through to update the tnode
2827 yaffs_chunk_del(dev, existingChunk, 1,
2830 /* Backward scanning or we want to use the existing one
2832 * Delete the new one and return early so that the tnode isn't changed
2834 yaffs_chunk_del(dev, nand_chunk, 1,
2842 if (existingChunk == 0)
2843 in->n_data_chunks++;
2845 yaffs_load_tnode_0(dev, tn, inode_chunk, nand_chunk);
2850 static int yaffs_rd_data_obj(yaffs_obj_t *in, int inode_chunk,
2853 int nand_chunk = yaffs_find_chunk_in_file(in, inode_chunk, NULL);
2855 if (nand_chunk >= 0)
2856 return yaffs_rd_chunk_tags_nand(in->my_dev, nand_chunk,
2859 T(YAFFS_TRACE_NANDACCESS,
2860 (TSTR("Chunk %d not found zero instead" TENDSTR),
2862 /* get sane (zero) data if you read a hole */
2863 memset(buffer, 0, in->my_dev->data_bytes_per_chunk);
2869 void yaffs_chunk_del(yaffs_dev_t *dev, int chunk_id, int mark_flash, int lyn)
2873 yaffs_ext_tags tags;
2874 yaffs_block_info_t *bi;
2880 block = chunk_id / dev->param.chunks_per_block;
2881 page = chunk_id % dev->param.chunks_per_block;
2884 if (!yaffs_check_chunk_bit(dev, block, page))
2885 T(YAFFS_TRACE_VERIFY,
2886 (TSTR("Deleting invalid chunk %d"TENDSTR),
2889 bi = yaffs_get_block_info(dev, block);
2891 yaffs2_update_oldest_dirty_seq(dev, block, bi);
2893 T(YAFFS_TRACE_DELETION,
2894 (TSTR("line %d delete of chunk %d" TENDSTR), lyn, chunk_id));
2896 if (!dev->param.is_yaffs2 && mark_flash &&
2897 bi->block_state != YAFFS_BLOCK_STATE_COLLECTING) {
2899 yaffs_init_tags(&tags);
2901 tags.is_deleted = 1;
2903 yaffs_wr_chunk_tags_nand(dev, chunk_id, NULL, &tags);
2904 yaffs_handle_chunk_update(dev, chunk_id, &tags);
2906 dev->n_unmarked_deletions++;
2909 /* Pull out of the management area.
2910 * If the whole block became dirty, this will kick off an erasure.
2912 if (bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING ||
2913 bi->block_state == YAFFS_BLOCK_STATE_FULL ||
2914 bi->block_state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
2915 bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) {
2916 dev->n_free_chunks++;
2918 yaffs_clear_chunk_bit(dev, block, page);
2922 if (bi->pages_in_use == 0 &&
2923 !bi->has_shrink_hdr &&
2924 bi->block_state != YAFFS_BLOCK_STATE_ALLOCATING &&
2925 bi->block_state != YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
2926 yaffs_block_became_dirty(dev, block);
2933 static int yaffs_wr_data_obj(yaffs_obj_t *in, int inode_chunk,
2934 const __u8 *buffer, int n_bytes,
2937 /* Find old chunk Need to do this to get serial number
2938 * Write new one and patch into tree.
2939 * Invalidate old tags.
2943 yaffs_ext_tags prevTags;
2946 yaffs_ext_tags newTags;
2948 yaffs_dev_t *dev = in->my_dev;
2950 yaffs_check_gc(dev,0);
2952 /* Get the previous chunk at this location in the file if it exists.
2953 * If it does not exist then put a zero into the tree. This creates
2954 * the tnode now, rather than later when it is harder to clean up.
2956 prevChunkId = yaffs_find_chunk_in_file(in, inode_chunk, &prevTags);
2957 if(prevChunkId < 1 &&
2958 !yaffs_put_chunk_in_file(in, inode_chunk, 0, 0))
2961 /* Set up new tags */
2962 yaffs_init_tags(&newTags);
2964 newTags.chunk_id = inode_chunk;
2965 newTags.obj_id = in->obj_id;
2966 newTags.serial_number =
2967 (prevChunkId > 0) ? prevTags.serial_number + 1 : 1;
2968 newTags.n_bytes = n_bytes;
2970 if (n_bytes < 1 || n_bytes > dev->param.total_bytes_per_chunk) {
2971 T(YAFFS_TRACE_ERROR,
2972 (TSTR("Writing %d bytes to chunk!!!!!!!!!" TENDSTR), n_bytes));
2978 yaffs_write_new_chunk(dev, buffer, &newTags,
2981 if (newChunkId > 0) {
2982 yaffs_put_chunk_in_file(in, inode_chunk, newChunkId, 0);
2984 if (prevChunkId > 0)
2985 yaffs_chunk_del(dev, prevChunkId, 1, __LINE__);
2987 yaffs_verify_file_sane(in);
2993 /* UpdateObjectHeader updates the header on NAND for an object.
2994 * If name is not NULL, then that new name is used.
2996 int yaffs_update_oh(yaffs_obj_t *in, const YCHAR *name, int force,
2997 int is_shrink, int shadows, yaffs_xattr_mod *xmod)
3000 yaffs_block_info_t *bi;
3002 yaffs_dev_t *dev = in->my_dev;
3009 yaffs_ext_tags newTags;
3010 yaffs_ext_tags oldTags;
3011 const YCHAR *alias = NULL;
3013 __u8 *buffer = NULL;
3014 YCHAR old_name[YAFFS_MAX_NAME_LENGTH + 1];
3016 yaffs_obj_header *oh = NULL;
3018 yaffs_strcpy(old_name, _Y("silly old name"));
3022 in == dev->root_dir || /* The root_dir should also be saved */
3025 yaffs_check_gc(dev,0);
3026 yaffs_check_obj_details_loaded(in);
3028 buffer = yaffs_get_temp_buffer(in->my_dev, __LINE__);
3029 oh = (yaffs_obj_header *) buffer;
3031 prevChunkId = in->hdr_chunk;
3033 if (prevChunkId > 0) {
3034 result = yaffs_rd_chunk_tags_nand(dev, prevChunkId,
3037 yaffs_verify_oh(in, oh, &oldTags, 0);
3039 memcpy(old_name, oh->name, sizeof(oh->name));
3040 memset(buffer, 0xFF, sizeof(yaffs_obj_header));
3042 memset(buffer, 0xFF, dev->data_bytes_per_chunk);
3044 oh->type = in->variant_type;
3045 oh->yst_mode = in->yst_mode;
3046 oh->shadows_obj = oh->inband_shadowed_obj_id = shadows;
3048 #ifdef CONFIG_YAFFS_WINCE
3049 oh->win_atime[0] = in->win_atime[0];
3050 oh->win_ctime[0] = in->win_ctime[0];
3051 oh->win_mtime[0] = in->win_mtime[0];
3052 oh->win_atime[1] = in->win_atime[1];
3053 oh->win_ctime[1] = in->win_ctime[1];
3054 oh->win_mtime[1] = in->win_mtime[1];
3056 oh->yst_uid = in->yst_uid;
3057 oh->yst_gid = in->yst_gid;
3058 oh->yst_atime = in->yst_atime;
3059 oh->yst_mtime = in->yst_mtime;
3060 oh->yst_ctime = in->yst_ctime;
3061 oh->yst_rdev = in->yst_rdev;
3064 oh->parent_obj_id = in->parent->obj_id;
3066 oh->parent_obj_id = 0;
3068 if (name && *name) {
3069 memset(oh->name, 0, sizeof(oh->name));
3070 yaffs_load_oh_from_name(dev,oh->name,name);
3071 } else if (prevChunkId > 0)
3072 memcpy(oh->name, old_name, sizeof(oh->name));
3074 memset(oh->name, 0, sizeof(oh->name));
3076 oh->is_shrink = is_shrink;
3078 switch (in->variant_type) {
3079 case YAFFS_OBJECT_TYPE_UNKNOWN:
3080 /* Should not happen */
3082 case YAFFS_OBJECT_TYPE_FILE:
3084 (oh->parent_obj_id == YAFFS_OBJECTID_DELETED
3085 || oh->parent_obj_id ==
3086 YAFFS_OBJECTID_UNLINKED) ? 0 : in->variant.
3087 file_variant.file_size;
3089 case YAFFS_OBJECT_TYPE_HARDLINK:
3091 in->variant.hardlink_variant.equiv_id;
3093 case YAFFS_OBJECT_TYPE_SPECIAL:
3096 case YAFFS_OBJECT_TYPE_DIRECTORY:
3099 case YAFFS_OBJECT_TYPE_SYMLINK:
3100 alias = in->variant.symlink_variant.alias;
3102 alias = _Y("no alias");
3103 yaffs_strncpy(oh->alias,
3105 YAFFS_MAX_ALIAS_LENGTH);
3106 oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
3110 /* process any xattrib modifications */
3112 yaffs_apply_xattrib_mod(in, (char *)buffer, xmod);
3116 yaffs_init_tags(&newTags);
3118 newTags.chunk_id = 0;
3119 newTags.obj_id = in->obj_id;
3120 newTags.serial_number = in->serial;
3122 /* Add extra info for file header */
3124 newTags.extra_available = 1;
3125 newTags.extra_parent_id = oh->parent_obj_id;
3126 newTags.extra_length = oh->file_size;
3127 newTags.extra_is_shrink = oh->is_shrink;
3128 newTags.extra_equiv_id = oh->equiv_id;
3129 newTags.extra_shadows = (oh->shadows_obj > 0) ? 1 : 0;
3130 newTags.extra_obj_type = in->variant_type;
3132 yaffs_verify_oh(in, oh, &newTags, 1);
3134 /* Create new chunk in NAND */
3136 yaffs_write_new_chunk(dev, buffer, &newTags,
3137 (prevChunkId > 0) ? 1 : 0);
3139 if (newChunkId >= 0) {
3141 in->hdr_chunk = newChunkId;
3143 if (prevChunkId > 0) {
3144 yaffs_chunk_del(dev, prevChunkId, 1,
3148 if (!yaffs_obj_cache_dirty(in))
3151 /* If this was a shrink, then mark the block that the chunk lives on */
3153 bi = yaffs_get_block_info(in->my_dev,
3154 newChunkId / in->my_dev->param.chunks_per_block);
3155 bi->has_shrink_hdr = 1;
3160 retVal = newChunkId;
3165 yaffs_release_temp_buffer(dev, buffer, __LINE__);
3170 /*------------------------ Short Operations Cache ----------------------------------------
3171 * In many situations where there is no high level buffering (eg WinCE) a lot of
3172 * reads might be short sequential reads, and a lot of writes may be short
3173 * sequential writes. eg. scanning/writing a jpeg file.
3174 * In these cases, a short read/write cache can provide a huge perfomance benefit
3175 * with dumb-as-a-rock code.
3176 * In Linux, the page cache provides read buffering aand the short op cache provides write
3179 * There are a limited number (~10) of cache chunks per device so that we don't
3180 * need a very intelligent search.
3183 static int yaffs_obj_cache_dirty(yaffs_obj_t *obj)
3185 yaffs_dev_t *dev = obj->my_dev;
3187 yaffs_cache_t *cache;
3188 int nCaches = obj->my_dev->param.n_caches;
3190 for (i = 0; i < nCaches; i++) {
3191 cache = &dev->cache[i];
3192 if (cache->object == obj &&
3201 static void yaffs_flush_file_cache(yaffs_obj_t *obj)
3203 yaffs_dev_t *dev = obj->my_dev;
3204 int lowest = -99; /* Stop compiler whining. */
3206 yaffs_cache_t *cache;
3207 int chunkWritten = 0;
3208 int nCaches = obj->my_dev->param.n_caches;
3214 /* Find the dirty cache for this object with the lowest chunk id. */
3215 for (i = 0; i < nCaches; i++) {
3216 if (dev->cache[i].object == obj &&
3217 dev->cache[i].dirty) {
3219 || dev->cache[i].chunk_id <
3221 cache = &dev->cache[i];
3222 lowest = cache->chunk_id;
3227 if (cache && !cache->locked) {
3228 /* Write it out and free it up */
3231 yaffs_wr_data_obj(cache->object,
3237 cache->object = NULL;
3240 } while (cache && chunkWritten > 0);
3243 /* Hoosterman, disk full while writing cache out. */
3244 T(YAFFS_TRACE_ERROR,
3245 (TSTR("yaffs tragedy: no space during cache write" TENDSTR)));
3252 /*yaffs_flush_whole_cache(dev)
3257 void yaffs_flush_whole_cache(yaffs_dev_t *dev)
3260 int nCaches = dev->param.n_caches;
3263 /* Find a dirty object in the cache and flush it...
3264 * until there are no further dirty objects.
3268 for (i = 0; i < nCaches && !obj; i++) {
3269 if (dev->cache[i].object &&
3270 dev->cache[i].dirty)
3271 obj = dev->cache[i].object;
3275 yaffs_flush_file_cache(obj);
3282 /* Grab us a cache chunk for use.
3283 * First look for an empty one.
3284 * Then look for the least recently used non-dirty one.
3285 * Then look for the least recently used dirty one...., flush and look again.
3287 static yaffs_cache_t *yaffs_grab_chunk_worker(yaffs_dev_t *dev)
3291 if (dev->param.n_caches > 0) {
3292 for (i = 0; i < dev->param.n_caches; i++) {
3293 if (!dev->cache[i].object)
3294 return &dev->cache[i];
3301 static yaffs_cache_t *yaffs_grab_chunk_cache(yaffs_dev_t *dev)
3303 yaffs_cache_t *cache;
3304 yaffs_obj_t *theObj;
3309 if (dev->param.n_caches > 0) {
3310 /* Try find a non-dirty one... */
3312 cache = yaffs_grab_chunk_worker(dev);
3315 /* They were all dirty, find the last recently used object and flush
3316 * its cache, then find again.
3317 * NB what's here is not very accurate, we actually flush the object
3318 * the last recently used page.
3321 /* With locking we can't assume we can use entry zero */
3328 for (i = 0; i < dev->param.n_caches; i++) {
3329 if (dev->cache[i].object &&
3330 !dev->cache[i].locked &&
3331 (dev->cache[i].last_use < usage || !cache)) {
3332 usage = dev->cache[i].last_use;
3333 theObj = dev->cache[i].object;
3334 cache = &dev->cache[i];
3339 if (!cache || cache->dirty) {
3340 /* Flush and try again */
3341 yaffs_flush_file_cache(theObj);
3342 cache = yaffs_grab_chunk_worker(dev);
3352 /* Find a cached chunk */
3353 static yaffs_cache_t *yaffs_find_chunk_cache(const yaffs_obj_t *obj,
3356 yaffs_dev_t *dev = obj->my_dev;
3358 if (dev->param.n_caches > 0) {
3359 for (i = 0; i < dev->param.n_caches; i++) {
3360 if (dev->cache[i].object == obj &&
3361 dev->cache[i].chunk_id == chunk_id) {
3364 return &dev->cache[i];
3371 /* Mark the chunk for the least recently used algorithym */
3372 static void yaffs_use_cache(yaffs_dev_t *dev, yaffs_cache_t *cache,
3376 if (dev->param.n_caches > 0) {
3377 if (dev->cache_last_use < 0 || dev->cache_last_use > 100000000) {
3378 /* Reset the cache usages */
3380 for (i = 1; i < dev->param.n_caches; i++)
3381 dev->cache[i].last_use = 0;
3383 dev->cache_last_use = 0;
3386 dev->cache_last_use++;
3388 cache->last_use = dev->cache_last_use;
3395 /* Invalidate a single cache page.
3396 * Do this when a whole page gets written,
3397 * ie the short cache for this page is no longer valid.
3399 static void yaffs_invalidate_chunk_cache(yaffs_obj_t *object, int chunk_id)
3401 if (object->my_dev->param.n_caches > 0) {
3402 yaffs_cache_t *cache = yaffs_find_chunk_cache(object, chunk_id);
3405 cache->object = NULL;
3409 /* Invalidate all the cache pages associated with this object
3410 * Do this whenever ther file is deleted or resized.
3412 static void yaffs_invalidate_whole_cache(yaffs_obj_t *in)
3415 yaffs_dev_t *dev = in->my_dev;
3417 if (dev->param.n_caches > 0) {
3418 /* Invalidate it. */
3419 for (i = 0; i < dev->param.n_caches; i++) {
3420 if (dev->cache[i].object == in)
3421 dev->cache[i].object = NULL;
3427 /*--------------------- File read/write ------------------------
3428 * Read and write have very similar structures.
3429 * In general the read/write has three parts to it
3430 * An incomplete chunk to start with (if the read/write is not chunk-aligned)
3431 * Some complete chunks
3432 * An incomplete chunk to end off with
3434 * Curve-balls: the first chunk might also be the last chunk.
3437 int yaffs_file_rd(yaffs_obj_t *in, __u8 *buffer, loff_t offset,
3446 yaffs_cache_t *cache;
3453 /* chunk = offset / dev->data_bytes_per_chunk + 1; */
3454 /* start = offset % dev->data_bytes_per_chunk; */
3455 yaffs_addr_to_chunk(dev, offset, &chunk, &start);
3458 /* OK now check for the curveball where the start and end are in
3461 if ((start + n) < dev->data_bytes_per_chunk)
3464 nToCopy = dev->data_bytes_per_chunk - start;
3466 cache = yaffs_find_chunk_cache(in, chunk);
3468 /* If the chunk is already in the cache or it is less than a whole chunk
3469 * or we're using inband tags then use the cache (if there is caching)
3470 * else bypass the cache.
3472 if (cache || nToCopy != dev->data_bytes_per_chunk || dev->param.inband_tags) {
3473 if (dev->param.n_caches > 0) {
3475 /* If we can't find the data in the cache, then load it up. */
3478 cache = yaffs_grab_chunk_cache(in->my_dev);
3480 cache->chunk_id = chunk;
3483 yaffs_rd_data_obj(in, chunk,
3489 yaffs_use_cache(dev, cache, 0);
3494 memcpy(buffer, &cache->data[start], nToCopy);
3498 /* Read into the local buffer then copy..*/
3501 yaffs_get_temp_buffer(dev, __LINE__);
3502 yaffs_rd_data_obj(in, chunk,
3505 memcpy(buffer, &localBuffer[start], nToCopy);
3508 yaffs_release_temp_buffer(dev, localBuffer,
3514 /* A full chunk. Read directly into the supplied buffer. */
3515 yaffs_rd_data_obj(in, chunk, buffer);
3529 int yaffs_do_file_wr(yaffs_obj_t *in, const __u8 *buffer, loff_t offset,
3530 int n_bytes, int write_trhrough)
3539 int startOfWrite = offset;
3540 int chunkWritten = 0;
3548 while (n > 0 && chunkWritten >= 0) {
3549 yaffs_addr_to_chunk(dev, offset, &chunk, &start);
3551 if (chunk * dev->data_bytes_per_chunk + start != offset ||
3552 start >= dev->data_bytes_per_chunk) {
3553 T(YAFFS_TRACE_ERROR, (
3554 TSTR("AddrToChunk of offset %d gives chunk %d start %d"
3556 (int)offset, chunk, start));
3558 chunk++; /* File pos to chunk in file offset */
3560 /* OK now check for the curveball where the start and end are in
3564 if ((start + n) < dev->data_bytes_per_chunk) {
3567 /* Now folks, to calculate how many bytes to write back....
3568 * If we're overwriting and not writing to then end of file then
3569 * we need to write back as much as was there before.
3572 chunkStart = ((chunk - 1) * dev->data_bytes_per_chunk);
3574 if (chunkStart > in->variant.file_variant.file_size)
3575 n_bytesRead = 0; /* Past end of file */
3577 n_bytesRead = in->variant.file_variant.file_size - chunkStart;
3579 if (n_bytesRead > dev->data_bytes_per_chunk)
3580 n_bytesRead = dev->data_bytes_per_chunk;
3584 (start + n)) ? n_bytesRead : (start + n);
3586 if (nToWriteBack < 0 || nToWriteBack > dev->data_bytes_per_chunk)
3590 nToCopy = dev->data_bytes_per_chunk - start;
3591 nToWriteBack = dev->data_bytes_per_chunk;
3594 if (nToCopy != dev->data_bytes_per_chunk || dev->param.inband_tags) {
3595 /* An incomplete start or end chunk (or maybe both start and end chunk),
3596 * or we're using inband tags, so we want to use the cache buffers.
3598 if (dev->param.n_caches > 0) {
3599 yaffs_cache_t *cache;
3600 /* If we can't find the data in the cache, then load the cache */
3601 cache = yaffs_find_chunk_cache(in, chunk);
3604 && yaffs_check_alloc_available(dev, 1)) {
3605 cache = yaffs_grab_chunk_cache(dev);
3607 cache->chunk_id = chunk;
3610 yaffs_rd_data_obj(in, chunk,
3614 !yaffs_check_alloc_available(dev, 1)) {
3615 /* Drop the cache if it was a read cache item and
3616 * no space check has been made for it.
3622 yaffs_use_cache(dev, cache, 1);
3626 memcpy(&cache->data[start], buffer,
3631 cache->n_bytes = nToWriteBack;
3633 if (write_trhrough) {
3638 cache->data, cache->n_bytes,
3644 chunkWritten = -1; /* fail the write */
3647 /* An incomplete start or end chunk (or maybe both start and end chunk)
3648 * Read into the local buffer then copy, then copy over and write back.
3652 yaffs_get_temp_buffer(dev, __LINE__);
3654 yaffs_rd_data_obj(in, chunk,
3659 memcpy(&localBuffer[start], buffer, nToCopy);
3662 yaffs_wr_data_obj(in, chunk,
3667 yaffs_release_temp_buffer(dev, localBuffer,
3673 /* A full chunk. Write directly from the supplied buffer. */
3678 yaffs_wr_data_obj(in, chunk, buffer,
3679 dev->data_bytes_per_chunk,
3682 /* Since we've overwritten the cached data, we better invalidate it. */
3683 yaffs_invalidate_chunk_cache(in, chunk);
3686 if (chunkWritten >= 0) {
3695 /* Update file object */
3697 if ((startOfWrite + nDone) > in->variant.file_variant.file_size)
3698 in->variant.file_variant.file_size = (startOfWrite + nDone);
3705 int yaffs_wr_file(yaffs_obj_t *in, const __u8 *buffer, loff_t offset,
3706 int n_bytes, int write_trhrough)
3708 yaffs2_handle_hole(in,offset);
3709 return yaffs_do_file_wr(in,buffer,offset,n_bytes,write_trhrough);
3714 /* ---------------------- File resizing stuff ------------------ */
3716 static void yaffs_prune_chunks(yaffs_obj_t *in, int new_size)
3719 yaffs_dev_t *dev = in->my_dev;
3720 int oldFileSize = in->variant.file_variant.file_size;
3722 int lastDel = 1 + (oldFileSize - 1) / dev->data_bytes_per_chunk;
3724 int startDel = 1 + (new_size + dev->data_bytes_per_chunk - 1) /
3725 dev->data_bytes_per_chunk;
3729 /* Delete backwards so that we don't end up with holes if
3730 * power is lost part-way through the operation.
3732 for (i = lastDel; i >= startDel; i--) {
3733 /* NB this could be optimised somewhat,
3734 * eg. could retrieve the tags and write them without
3735 * using yaffs_chunk_del
3738 chunk_id = yaffs_find_del_file_chunk(in, i, NULL);
3741 (dev->internal_start_block * dev->param.chunks_per_block)
3743 ((dev->internal_end_block +
3744 1) * dev->param.chunks_per_block)) {
3745 T(YAFFS_TRACE_ALWAYS,
3746 (TSTR("Found daft chunk_id %d for %d" TENDSTR),
3749 in->n_data_chunks--;
3750 yaffs_chunk_del(dev, chunk_id, 1, __LINE__);
3758 void yaffs_resize_file_down( yaffs_obj_t *obj, loff_t new_size)
3761 __u32 new_sizeOfPartialChunk;
3762 yaffs_dev_t *dev = obj->my_dev;
3764 yaffs_addr_to_chunk(dev, new_size, &newFullChunks, &new_sizeOfPartialChunk);
3766 yaffs_prune_chunks(obj, new_size);
3768 if (new_sizeOfPartialChunk != 0) {
3769 int lastChunk = 1 + newFullChunks;
3770 __u8 *localBuffer = yaffs_get_temp_buffer(dev, __LINE__);
3772 /* Got to read and rewrite the last chunk with its new size and zero pad */
3773 yaffs_rd_data_obj(obj, lastChunk, localBuffer);
3774 memset(localBuffer + new_sizeOfPartialChunk, 0,
3775 dev->data_bytes_per_chunk - new_sizeOfPartialChunk);
3777 yaffs_wr_data_obj(obj, lastChunk, localBuffer,
3778 new_sizeOfPartialChunk, 1);
3780 yaffs_release_temp_buffer(dev, localBuffer, __LINE__);
3783 obj->variant.file_variant.file_size = new_size;
3785 yaffs_prune_tree(dev, &obj->variant.file_variant);
3789 int yaffs_resize_file(yaffs_obj_t *in, loff_t new_size)
3791 yaffs_dev_t *dev = in->my_dev;
3792 int oldFileSize = in->variant.file_variant.file_size;
3794 yaffs_flush_file_cache(in);
3795 yaffs_invalidate_whole_cache(in);
3797 yaffs_check_gc(dev,0);
3799 if (in->variant_type != YAFFS_OBJECT_TYPE_FILE)
3802 if (new_size == oldFileSize)
3805 if(new_size > oldFileSize){
3806 yaffs2_handle_hole(in,new_size);
3807 in->variant.file_variant.file_size = new_size;
3809 /* new_size < oldFileSize */
3810 yaffs_resize_file_down(in, new_size);
3813 /* Write a new object header to reflect the resize.
3814 * show we've shrunk the file, if need be
3815 * Do this only if the file is not in the deleted directories
3816 * and is not shadowed.
3820 in->parent->obj_id != YAFFS_OBJECTID_UNLINKED &&
3821 in->parent->obj_id != YAFFS_OBJECTID_DELETED)
3822 yaffs_update_oh(in, NULL, 0, 0, 0, NULL);
3828 loff_t yaffs_get_file_size(yaffs_obj_t *obj)
3830 YCHAR *alias = NULL;
3831 obj = yaffs_get_equivalent_obj(obj);
3833 switch (obj->variant_type) {
3834 case YAFFS_OBJECT_TYPE_FILE:
3835 return obj->variant.file_variant.file_size;
3836 case YAFFS_OBJECT_TYPE_SYMLINK:
3837 alias = obj->variant.symlink_variant.alias;
3840 return yaffs_strnlen(alias,YAFFS_MAX_ALIAS_LENGTH);
3848 int yaffs_flush_file(yaffs_obj_t *in, int update_time, int data_sync)
3852 yaffs_flush_file_cache(in);
3853 if(data_sync) /* Only sync data */
3857 #ifdef CONFIG_YAFFS_WINCE
3858 yfsd_win_file_time_now(in->win_mtime);
3861 in->yst_mtime = Y_CURRENT_TIME;
3866 retVal = (yaffs_update_oh(in, NULL, 0, 0, 0, NULL) >=
3867 0) ? YAFFS_OK : YAFFS_FAIL;
3877 static int yaffs_generic_obj_del(yaffs_obj_t *in)
3880 /* First off, invalidate the file's data in the cache, without flushing. */
3881 yaffs_invalidate_whole_cache(in);
3883 if (in->my_dev->param.is_yaffs2 && (in->parent != in->my_dev->del_dir)) {
3884 /* Move to the unlinked directory so we have a record that it was deleted. */
3885 yaffs_change_obj_name(in, in->my_dev->del_dir, _Y("deleted"), 0, 0);
3889 yaffs_remove_obj_from_dir(in);
3890 yaffs_chunk_del(in->my_dev, in->hdr_chunk, 1, __LINE__);
3898 /* yaffs_del_file deletes the whole file data
3899 * and the inode associated with the file.
3900 * It does not delete the links associated with the file.
3902 static int yaffs_unlink_file_if_needed(yaffs_obj_t *in)
3906 int immediateDeletion = 0;
3907 yaffs_dev_t *dev = in->my_dev;
3910 immediateDeletion = 1;
3912 if (immediateDeletion) {
3914 yaffs_change_obj_name(in, in->my_dev->del_dir,
3915 _Y("deleted"), 0, 0);
3916 T(YAFFS_TRACE_TRACING,
3917 (TSTR("yaffs: immediate deletion of file %d" TENDSTR),
3920 in->my_dev->n_deleted_files++;
3921 if (dev->param.disable_soft_del || dev->param.is_yaffs2)
3922 yaffs_resize_file(in, 0);
3923 yaffs_soft_del_file(in);
3926 yaffs_change_obj_name(in, in->my_dev->unlinked_dir,
3927 _Y("unlinked"), 0, 0);
3934 int yaffs_del_file(yaffs_obj_t *in)
3936 int retVal = YAFFS_OK;
3937 int deleted; /* Need to cache value on stack if in is freed */
3938 yaffs_dev_t *dev = in->my_dev;
3940 if (dev->param.disable_soft_del || dev->param.is_yaffs2)
3941 yaffs_resize_file(in, 0);
3943 if (in->n_data_chunks > 0) {
3944 /* Use soft deletion if there is data in the file.
3945 * That won't be the case if it has been resized to zero.
3948 retVal = yaffs_unlink_file_if_needed(in);
3950 deleted = in->deleted;
3952 if (retVal == YAFFS_OK && in->unlinked && !in->deleted) {
3955 in->my_dev->n_deleted_files++;
3956 yaffs_soft_del_file(in);
3958 return deleted ? YAFFS_OK : YAFFS_FAIL;
3960 /* The file has no data chunks so we toss it immediately */
3961 yaffs_free_tnode(in->my_dev, in->variant.file_variant.top);
3962 in->variant.file_variant.top = NULL;
3963 yaffs_generic_obj_del(in);
3969 static int yaffs_is_non_empty_dir(yaffs_obj_t *obj)
3971 return (obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) &&
3972 !(ylist_empty(&obj->variant.dir_variant.children));
3975 static int yaffs_del_dir(yaffs_obj_t *obj)
3977 /* First check that the directory is empty. */
3978 if (yaffs_is_non_empty_dir(obj))
3981 return yaffs_generic_obj_del(obj);
3984 static int yaffs_del_symlink(yaffs_obj_t *in)
3986 if(in->variant.symlink_variant.alias)
3987 YFREE(in->variant.symlink_variant.alias);
3988 in->variant.symlink_variant.alias=NULL;
3990 return yaffs_generic_obj_del(in);
3993 static int yaffs_del_link(yaffs_obj_t *in)
3995 /* remove this hardlink from the list assocaited with the equivalent
3998 ylist_del_init(&in->hard_links);
3999 return yaffs_generic_obj_del(in);
4002 int yaffs_del_obj(yaffs_obj_t *obj)
4005 switch (obj->variant_type) {
4006 case YAFFS_OBJECT_TYPE_FILE:
4007 retVal = yaffs_del_file(obj);
4009 case YAFFS_OBJECT_TYPE_DIRECTORY:
4010 if(!ylist_empty(&obj->variant.dir_variant.dirty)){
4011 T(YAFFS_TRACE_BACKGROUND, (TSTR("Remove object %d from dirty directories" TENDSTR),obj->obj_id));
4012 ylist_del_init(&obj->variant.dir_variant.dirty);
4014 return yaffs_del_dir(obj);
4016 case YAFFS_OBJECT_TYPE_SYMLINK:
4017 retVal = yaffs_del_symlink(obj);
4019 case YAFFS_OBJECT_TYPE_HARDLINK:
4020 retVal = yaffs_del_link(obj);
4022 case YAFFS_OBJECT_TYPE_SPECIAL:
4023 retVal = yaffs_generic_obj_del(obj);
4025 case YAFFS_OBJECT_TYPE_UNKNOWN:
4027 break; /* should not happen. */
4033 static int yaffs_unlink_worker(yaffs_obj_t *obj)
4036 int immediateDeletion = 0;
4039 immediateDeletion = 1;
4042 yaffs_update_parent(obj->parent);
4044 if (obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) {
4045 return yaffs_del_link(obj);
4046 } else if (!ylist_empty(&obj->hard_links)) {
4047 /* Curve ball: We're unlinking an object that has a hardlink.
4049 * This problem arises because we are not strictly following
4050 * The Linux link/inode model.
4052 * We can't really delete the object.
4053 * Instead, we do the following:
4054 * - Select a hardlink.
4055 * - Unhook it from the hard links
4056 * - Move it from its parent directory (so that the rename can work)
4057 * - Rename the object to the hardlink's name.
4058 * - Delete the hardlink
4062 yaffs_obj_t *parent;
4064 YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
4066 hl = ylist_entry(obj->hard_links.next, yaffs_obj_t, hard_links);
4068 yaffs_get_obj_name(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
4069 parent = hl->parent;
4071 ylist_del_init(&hl->hard_links);
4073 yaffs_add_obj_to_dir(obj->my_dev->unlinked_dir, hl);
4075 retVal = yaffs_change_obj_name(obj,parent, name, 0, 0);
4077 if (retVal == YAFFS_OK)
4078 retVal = yaffs_generic_obj_del(hl);
4082 } else if (immediateDeletion) {
4083 switch (obj->variant_type) {
4084 case YAFFS_OBJECT_TYPE_FILE:
4085 return yaffs_del_file(obj);
4087 case YAFFS_OBJECT_TYPE_DIRECTORY:
4088 ylist_del_init(&obj->variant.dir_variant.dirty);
4089 return yaffs_del_dir(obj);
4091 case YAFFS_OBJECT_TYPE_SYMLINK:
4092 return yaffs_del_symlink(obj);
4094 case YAFFS_OBJECT_TYPE_SPECIAL:
4095 return yaffs_generic_obj_del(obj);
4097 case YAFFS_OBJECT_TYPE_HARDLINK:
4098 case YAFFS_OBJECT_TYPE_UNKNOWN:
4102 } else if(yaffs_is_non_empty_dir(obj))
4105 return yaffs_change_obj_name(obj, obj->my_dev->unlinked_dir,
4106 _Y("unlinked"), 0, 0);
4110 static int yaffs_unlink_obj(yaffs_obj_t *obj)
4113 if (obj && obj->unlink_allowed)
4114 return yaffs_unlink_worker(obj);
4119 int yaffs_unlinker(yaffs_obj_t *dir, const YCHAR *name)
4123 obj = yaffs_find_by_name(dir, name);
4124 return yaffs_unlink_obj(obj);
4127 /*----------------------- Initialisation Scanning ---------------------- */
4129 void yaffs_handle_shadowed_obj(yaffs_dev_t *dev, int obj_id,
4130 int backward_scanning)
4134 if (!backward_scanning) {
4135 /* Handle YAFFS1 forward scanning case
4136 * For YAFFS1 we always do the deletion
4140 /* Handle YAFFS2 case (backward scanning)
4141 * If the shadowed object exists then ignore.
4143 obj = yaffs_find_by_number(dev, obj_id);
4148 /* Let's create it (if it does not exist) assuming it is a file so that it can do shrinking etc.
4149 * We put it in unlinked dir to be cleaned up after the scanning
4152 yaffs_find_or_create_by_number(dev, obj_id,
4153 YAFFS_OBJECT_TYPE_FILE);
4156 obj->is_shadowed = 1;
4157 yaffs_add_obj_to_dir(dev->unlinked_dir, obj);
4158 obj->variant.file_variant.shrink_size = 0;
4159 obj->valid = 1; /* So that we don't read any other info for this file */
4164 void yaffs_link_fixup(yaffs_dev_t *dev, yaffs_obj_t *hard_list)
4171 hard_list = (yaffs_obj_t *) (hard_list->hard_links.next);
4173 in = yaffs_find_by_number(dev,
4174 hl->variant.hardlink_variant.
4178 /* Add the hardlink pointers */
4179 hl->variant.hardlink_variant.equiv_obj = in;
4180 ylist_add(&hl->hard_links, &in->hard_links);
4182 /* Todo Need to report/handle this better.
4183 * Got a problem... hardlink to a non-existant object
4185 hl->variant.hardlink_variant.equiv_obj = NULL;
4186 YINIT_LIST_HEAD(&hl->hard_links);
4193 static void yaffs_strip_deleted_objs(yaffs_dev_t *dev)
4196 * Sort out state of unlinked and deleted objects after scanning.
4198 struct ylist_head *i;
4199 struct ylist_head *n;
4205 /* Soft delete all the unlinked files */
4206 ylist_for_each_safe(i, n,
4207 &dev->unlinked_dir->variant.dir_variant.children) {
4209 l = ylist_entry(i, yaffs_obj_t, siblings);
4214 ylist_for_each_safe(i, n,
4215 &dev->del_dir->variant.dir_variant.children) {
4217 l = ylist_entry(i, yaffs_obj_t, siblings);
4225 * This code iterates through all the objects making sure that they are rooted.
4226 * Any unrooted objects are re-rooted in lost+found.
4227 * An object needs to be in one of:
4228 * - Directly under deleted, unlinked
4229 * - Directly or indirectly under root.
4232 * This code assumes that we don't ever change the current relationships between
4234 * root_dir->parent == unlinked_dir->parent == del_dir->parent == NULL
4235 * lostNfound->parent == root_dir
4237 * This fixes the problem where directories might have inadvertently been deleted
4238 * leaving the object "hanging" without being rooted in the directory tree.
4241 static int yaffs_has_null_parent(yaffs_dev_t *dev, yaffs_obj_t *obj)
4243 return (obj == dev->del_dir ||
4244 obj == dev->unlinked_dir||
4245 obj == dev->root_dir);
4248 static void yaffs_fix_hanging_objs(yaffs_dev_t *dev)
4251 yaffs_obj_t *parent;
4253 struct ylist_head *lh;
4254 struct ylist_head *n;
4261 /* Iterate through the objects in each hash entry,
4262 * looking at each object.
4263 * Make sure it is rooted.
4266 for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
4267 ylist_for_each_safe(lh, n, &dev->obj_bucket[i].list) {
4269 obj = ylist_entry(lh, yaffs_obj_t, hash_link);
4270 parent= obj->parent;
4272 if(yaffs_has_null_parent(dev,obj)){
4273 /* These directories are not hanging */
4276 else if(!parent || parent->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
4278 else if(yaffs_has_null_parent(dev,parent))
4282 * Need to follow the parent chain to see if it is hanging.
4287 while(parent != dev->root_dir &&
4289 parent->parent->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY &&
4291 parent = parent->parent;
4294 if(parent != dev->root_dir)
4299 (TSTR("Hanging object %d moved to lost and found" TENDSTR),
4301 yaffs_add_obj_to_dir(dev->lost_n_found,obj);
4310 * Delete directory contents for cleaning up lost and found.
4312 static void yaffs_del_dir_contents(yaffs_obj_t *dir)
4315 struct ylist_head *lh;
4316 struct ylist_head *n;
4318 if(dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
4321 ylist_for_each_safe(lh, n, &dir->variant.dir_variant.children) {
4323 obj = ylist_entry(lh, yaffs_obj_t, siblings);
4324 if(obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY)
4325 yaffs_del_dir_contents(obj);
4328 (TSTR("Deleting lost_found object %d" TENDSTR),
4331 /* Need to use UnlinkObject since Delete would not handle
4332 * hardlinked objects correctly.
4334 yaffs_unlink_obj(obj);
4340 static void yaffs_empty_l_n_f(yaffs_dev_t *dev)
4342 yaffs_del_dir_contents(dev->lost_n_found);
4345 static void yaffs_check_obj_details_loaded(yaffs_obj_t *in)
4348 yaffs_obj_header *oh;
4350 yaffs_ext_tags tags;
4352 int alloc_failed = 0;
4360 T(YAFFS_TRACE_SCAN, (TSTR("details for object %d %s loaded" TENDSTR),
4362 in->lazy_loaded ? "not yet" : "already"));
4365 if (in->lazy_loaded && in->hdr_chunk > 0) {
4366 in->lazy_loaded = 0;
4367 chunkData = yaffs_get_temp_buffer(dev, __LINE__);
4369 result = yaffs_rd_chunk_tags_nand(dev, in->hdr_chunk, chunkData, &tags);
4370 oh = (yaffs_obj_header *) chunkData;
4372 in->yst_mode = oh->yst_mode;
4373 #ifdef CONFIG_YAFFS_WINCE
4374 in->win_atime[0] = oh->win_atime[0];
4375 in->win_ctime[0] = oh->win_ctime[0];
4376 in->win_mtime[0] = oh->win_mtime[0];
4377 in->win_atime[1] = oh->win_atime[1];
4378 in->win_ctime[1] = oh->win_ctime[1];
4379 in->win_mtime[1] = oh->win_mtime[1];
4381 in->yst_uid = oh->yst_uid;
4382 in->yst_gid = oh->yst_gid;
4383 in->yst_atime = oh->yst_atime;
4384 in->yst_mtime = oh->yst_mtime;
4385 in->yst_ctime = oh->yst_ctime;
4386 in->yst_rdev = oh->yst_rdev;
4389 yaffs_set_obj_name_from_oh(in, oh);
4391 if (in->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) {
4392 in->variant.symlink_variant.alias =
4393 yaffs_clone_str(oh->alias);
4394 if (!in->variant.symlink_variant.alias)
4395 alloc_failed = 1; /* Not returned to caller */
4398 yaffs_release_temp_buffer(dev, chunkData, __LINE__);
4402 /*------------------------------ Directory Functions ----------------------------- */
4405 *yaffs_update_parent() handles fixing a directories mtime and ctime when a new
4406 * link (ie. name) is created or deleted in the directory.
4409 * create dir/a : update dir's mtime/ctime
4410 * rm dir/a: update dir's mtime/ctime
4411 * modify dir/a: don't update dir's mtimme/ctime
4413 * This can be handled immediately or defered. Defering helps reduce the number
4414 * of updates when many files in a directory are changed within a brief period.
4416 * If the directory updating is defered then yaffs_update_dirty_dirs must be
4417 * called periodically.
4420 static void yaffs_update_parent(yaffs_obj_t *obj)
4425 #ifndef CONFIG_YAFFS_WINCE
4429 obj->yst_mtime = obj->yst_ctime = Y_CURRENT_TIME;
4430 if(dev->param.defered_dir_update){
4431 struct ylist_head *link = &obj->variant.dir_variant.dirty;
4433 if(ylist_empty(link)){
4434 ylist_add(link,&dev->dirty_dirs);
4435 T(YAFFS_TRACE_BACKGROUND, (TSTR("Added object %d to dirty directories" TENDSTR),obj->obj_id));
4439 yaffs_update_oh(obj, NULL, 0, 0, 0, NULL);
4443 void yaffs_update_dirty_dirs(yaffs_dev_t *dev)
4445 struct ylist_head *link;
4448 yaffs_obj_variant *oV;
4450 T(YAFFS_TRACE_BACKGROUND, (TSTR("Update dirty directories" TENDSTR)));
4452 while(!ylist_empty(&dev->dirty_dirs)){
4453 link = dev->dirty_dirs.next;
4454 ylist_del_init(link);
4456 dS=ylist_entry(link,yaffs_dir_s,dirty);
4457 oV = ylist_entry(dS,yaffs_obj_variant,dir_variant);
4458 obj = ylist_entry(oV,yaffs_obj_t,variant);
4460 T(YAFFS_TRACE_BACKGROUND, (TSTR("Update directory %d" TENDSTR), obj->obj_id));
4463 yaffs_update_oh(obj, NULL, 0, 0, 0, NULL);
4467 static void yaffs_remove_obj_from_dir(yaffs_obj_t *obj)
4469 yaffs_dev_t *dev = obj->my_dev;
4470 yaffs_obj_t *parent;
4472 yaffs_verify_obj_in_dir(obj);
4473 parent = obj->parent;
4475 yaffs_verify_dir(parent);
4477 if (dev && dev->param.remove_obj_fn)
4478 dev->param.remove_obj_fn(obj);
4481 ylist_del_init(&obj->siblings);
4484 yaffs_verify_dir(parent);
4487 void yaffs_add_obj_to_dir(yaffs_obj_t *directory,
4491 T(YAFFS_TRACE_ALWAYS,
4493 ("tragedy: Trying to add an object to a null pointer directory"
4498 if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
4499 T(YAFFS_TRACE_ALWAYS,
4501 ("tragedy: Trying to add an object to a non-directory"
4506 if (obj->siblings.prev == NULL) {
4507 /* Not initialised */
4512 yaffs_verify_dir(directory);
4514 yaffs_remove_obj_from_dir(obj);
4518 ylist_add(&obj->siblings, &directory->variant.dir_variant.children);
4519 obj->parent = directory;
4521 if (directory == obj->my_dev->unlinked_dir
4522 || directory == obj->my_dev->del_dir) {
4524 obj->my_dev->n_unlinked_files++;
4525 obj->rename_allowed = 0;
4528 yaffs_verify_dir(directory);
4529 yaffs_verify_obj_in_dir(obj);
4532 yaffs_obj_t *yaffs_find_by_name(yaffs_obj_t *directory,
4537 struct ylist_head *i;
4538 YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
4546 T(YAFFS_TRACE_ALWAYS,
4548 ("tragedy: yaffs_find_by_name: null pointer directory"
4553 if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
4554 T(YAFFS_TRACE_ALWAYS,
4556 ("tragedy: yaffs_find_by_name: non-directory" TENDSTR)));
4560 sum = yaffs_calc_name_sum(name);
4562 ylist_for_each(i, &directory->variant.dir_variant.children) {
4564 l = ylist_entry(i, yaffs_obj_t, siblings);
4566 if (l->parent != directory)
4569 yaffs_check_obj_details_loaded(l);
4571 /* Special case for lost-n-found */
4572 if (l->obj_id == YAFFS_OBJECTID_LOSTNFOUND) {
4573 if (yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME) == 0)
4575 } else if (yaffs_sum_cmp(l->sum, sum) || l->hdr_chunk <= 0) {
4576 /* LostnFound chunk called Objxxx
4579 yaffs_get_obj_name(l, buffer,
4580 YAFFS_MAX_NAME_LENGTH + 1);
4581 if (yaffs_strncmp(name, buffer, YAFFS_MAX_NAME_LENGTH) == 0)
4592 int yaffs_ApplyToDirectoryChildren(yaffs_obj_t *the_dir,
4593 int (*fn) (yaffs_obj_t *))
4595 struct ylist_head *i;
4599 T(YAFFS_TRACE_ALWAYS,
4601 ("tragedy: yaffs_find_by_name: null pointer directory"
4606 if (the_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
4607 T(YAFFS_TRACE_ALWAYS,
4609 ("tragedy: yaffs_find_by_name: non-directory" TENDSTR)));
4614 ylist_for_each(i, &the_dir->variant.dir_variant.children) {
4616 l = ylist_entry(i, yaffs_obj_t, siblings);
4627 /* GetEquivalentObject dereferences any hard links to get to the
4631 yaffs_obj_t *yaffs_get_equivalent_obj(yaffs_obj_t *obj)
4633 if (obj && obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) {
4634 /* We want the object id of the equivalent object, not this one */
4635 obj = obj->variant.hardlink_variant.equiv_obj;
4636 yaffs_check_obj_details_loaded(obj);
4642 * A note or two on object names.
4643 * * If the object name is missing, we then make one up in the form objnnn
4645 * * ASCII names are stored in the object header's name field from byte zero
4646 * * Unicode names are historically stored starting from byte zero.
4648 * Then there are automatic Unicode names...
4649 * The purpose of these is to save names in a way that can be read as
4650 * ASCII or Unicode names as appropriate, thus allowing a Unicode and ASCII
4651 * system to share files.
4653 * These automatic unicode are stored slightly differently...
4654 * - If the name can fit in the ASCII character space then they are saved as
4655 * ascii names as per above.
4656 * - If the name needs Unicode then the name is saved in Unicode
4657 * starting at oh->name[1].
4660 static void yaffs_fix_null_name(yaffs_obj_t * obj,YCHAR * name, int buffer_size)
4662 /* Create an object name if we could not find one. */
4663 if(yaffs_strnlen(name,YAFFS_MAX_NAME_LENGTH) == 0){
4665 YCHAR numString[20];
4666 YCHAR *x = &numString[19];
4667 unsigned v = obj->obj_id;
4671 *x = '0' + (v % 10);
4674 /* make up a name */
4675 yaffs_strcpy(locName, YAFFS_LOSTNFOUND_PREFIX);
4676 yaffs_strcat(locName,x);
4677 yaffs_strncpy(name, locName, buffer_size - 1);
4681 static void yaffs_load_name_from_oh(yaffs_dev_t *dev,YCHAR *name, const YCHAR *ohName, int bufferSize)
4683 #ifdef CONFIG_YAFFS_AUTO_UNICODE
4684 if(dev->param.auto_unicode){
4686 /* It is an ASCII name, so do an ASCII to unicode conversion */
4687 const char *asciiOhName = (const char *)ohName;
4688 int n = bufferSize - 1;
4689 while(n > 0 && *asciiOhName){
4690 *name = *asciiOhName;
4696 yaffs_strncpy(name,ohName+1, bufferSize -1);
4699 yaffs_strncpy(name, ohName, bufferSize - 1);
4703 static void yaffs_load_oh_from_name(yaffs_dev_t *dev, YCHAR *ohName, const YCHAR *name)
4705 #ifdef CONFIG_YAFFS_AUTO_UNICODE
4710 if(dev->param.auto_unicode){
4715 /* Figure out if the name will fit in ascii character set */
4716 while(isAscii && *w){
4723 /* It is an ASCII name, so do a unicode to ascii conversion */
4724 char *asciiOhName = (char *)ohName;
4725 int n = YAFFS_MAX_NAME_LENGTH - 1;
4726 while(n > 0 && *name){
4727 *asciiOhName= *name;
4733 /* It is a unicode name, so save starting at the second YCHAR */
4735 yaffs_strncpy(ohName+1,name, YAFFS_MAX_NAME_LENGTH -2);
4740 yaffs_strncpy(ohName,name, YAFFS_MAX_NAME_LENGTH - 1);
4744 int yaffs_get_obj_name(yaffs_obj_t * obj, YCHAR * name, int buffer_size)
4746 memset(name, 0, buffer_size * sizeof(YCHAR));
4748 yaffs_check_obj_details_loaded(obj);
4750 if (obj->obj_id == YAFFS_OBJECTID_LOSTNFOUND) {
4751 yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffer_size - 1);
4753 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
4754 else if (obj->short_name[0]) {
4755 yaffs_strcpy(name, obj->short_name);
4758 else if(obj->hdr_chunk > 0) {
4760 __u8 *buffer = yaffs_get_temp_buffer(obj->my_dev, __LINE__);
4762 yaffs_obj_header *oh = (yaffs_obj_header *) buffer;
4764 memset(buffer, 0, obj->my_dev->data_bytes_per_chunk);
4766 if (obj->hdr_chunk > 0) {
4767 result = yaffs_rd_chunk_tags_nand(obj->my_dev,
4768 obj->hdr_chunk, buffer,
4771 yaffs_load_name_from_oh(obj->my_dev,name,oh->name,buffer_size);
4773 yaffs_release_temp_buffer(obj->my_dev, buffer, __LINE__);
4776 yaffs_fix_null_name(obj,name,buffer_size);
4778 return yaffs_strnlen(name,YAFFS_MAX_NAME_LENGTH);
4782 int yaffs_get_obj_length(yaffs_obj_t *obj)
4784 /* Dereference any hard linking */
4785 obj = yaffs_get_equivalent_obj(obj);
4787 if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE)
4788 return obj->variant.file_variant.file_size;
4789 if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK){
4790 if(!obj->variant.symlink_variant.alias)
4792 return yaffs_strnlen(obj->variant.symlink_variant.alias,YAFFS_MAX_ALIAS_LENGTH);
4794 /* Only a directory should drop through to here */
4795 return obj->my_dev->data_bytes_per_chunk;
4799 int yaffs_get_obj_link_count(yaffs_obj_t *obj)
4802 struct ylist_head *i;
4805 count++; /* the object itself */
4807 ylist_for_each(i, &obj->hard_links)
4808 count++; /* add the hard links; */
4813 int yaffs_get_obj_inode(yaffs_obj_t *obj)
4815 obj = yaffs_get_equivalent_obj(obj);
4820 unsigned yaffs_get_obj_type(yaffs_obj_t *obj)
4822 obj = yaffs_get_equivalent_obj(obj);
4824 switch (obj->variant_type) {
4825 case YAFFS_OBJECT_TYPE_FILE:
4828 case YAFFS_OBJECT_TYPE_DIRECTORY:
4831 case YAFFS_OBJECT_TYPE_SYMLINK:
4834 case YAFFS_OBJECT_TYPE_HARDLINK:
4837 case YAFFS_OBJECT_TYPE_SPECIAL:
4838 if (S_ISFIFO(obj->yst_mode))
4840 if (S_ISCHR(obj->yst_mode))
4842 if (S_ISBLK(obj->yst_mode))
4844 if (S_ISSOCK(obj->yst_mode))
4852 YCHAR *yaffs_get_symlink_alias(yaffs_obj_t *obj)
4854 obj = yaffs_get_equivalent_obj(obj);
4855 if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK)
4856 return yaffs_clone_str(obj->variant.symlink_variant.alias);
4858 return yaffs_clone_str(_Y(""));
4861 #ifndef CONFIG_YAFFS_WINCE
4863 int yaffs_set_attribs(yaffs_obj_t *obj, struct iattr *attr)
4865 unsigned int valid = attr->ia_valid;
4867 if (valid & ATTR_MODE)
4868 obj->yst_mode = attr->ia_mode;
4869 if (valid & ATTR_UID)
4870 obj->yst_uid = attr->ia_uid;
4871 if (valid & ATTR_GID)
4872 obj->yst_gid = attr->ia_gid;
4874 if (valid & ATTR_ATIME)
4875 obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
4876 if (valid & ATTR_CTIME)
4877 obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
4878 if (valid & ATTR_MTIME)
4879 obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
4881 if (valid & ATTR_SIZE)
4882 yaffs_resize_file(obj, attr->ia_size);
4884 yaffs_update_oh(obj, NULL, 1, 0, 0, NULL);
4889 int yaffs_get_attribs(yaffs_obj_t *obj, struct iattr *attr)
4891 unsigned int valid = 0;
4893 attr->ia_mode = obj->yst_mode;
4895 attr->ia_uid = obj->yst_uid;
4897 attr->ia_gid = obj->yst_gid;
4900 Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime;
4901 valid |= ATTR_ATIME;
4902 Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime;
4903 valid |= ATTR_CTIME;
4904 Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime;
4905 valid |= ATTR_MTIME;
4907 attr->ia_size = yaffs_get_file_size(obj);
4910 attr->ia_valid = valid;
4918 static int yaffs_do_xattrib_mod(yaffs_obj_t *obj, int set, const YCHAR *name, const void *value, int size, int flags)
4920 yaffs_xattr_mod xmod;
4929 xmod.result = -ENOSPC;
4931 result = yaffs_update_oh(obj, NULL, 0, 0, 0, &xmod);
4939 static int yaffs_apply_xattrib_mod(yaffs_obj_t *obj, char *buffer, yaffs_xattr_mod *xmod)
4942 int x_offs = sizeof(yaffs_obj_header);
4943 yaffs_dev_t *dev = obj->my_dev;
4944 int x_size = dev->data_bytes_per_chunk - sizeof(yaffs_obj_header);
4946 char * x_buffer = buffer + x_offs;
4949 retval = nval_set(x_buffer, x_size, xmod->name, xmod->data, xmod->size, xmod->flags);
4951 retval = nval_del(x_buffer, x_size, xmod->name);
4953 obj->has_xattr = nval_hasvalues(x_buffer, x_size);
4954 obj->xattr_known = 1;
4956 xmod->result = retval;
4961 static int yaffs_do_xattrib_fetch(yaffs_obj_t *obj, const YCHAR *name, void *value, int size)
4963 char *buffer = NULL;
4965 yaffs_ext_tags tags;
4966 yaffs_dev_t *dev = obj->my_dev;
4967 int x_offs = sizeof(yaffs_obj_header);
4968 int x_size = dev->data_bytes_per_chunk - sizeof(yaffs_obj_header);
4974 if(obj->hdr_chunk < 1)
4977 /* If we know that the object has no xattribs then don't do all the
4978 * reading and parsing.
4980 if(obj->xattr_known && !obj->has_xattr){
4987 buffer = (char *) yaffs_get_temp_buffer(dev, __LINE__);
4991 result = yaffs_rd_chunk_tags_nand(dev,obj->hdr_chunk, (__u8 *)buffer, &tags);
4993 if(result != YAFFS_OK)
4996 x_buffer = buffer + x_offs;
4998 if (!obj->xattr_known){
4999 obj->has_xattr = nval_hasvalues(x_buffer, x_size);
5000 obj->xattr_known = 1;
5004 retval = nval_get(x_buffer, x_size, name, value, size);
5006 retval = nval_list(x_buffer, x_size, value,size);
5008 yaffs_release_temp_buffer(dev,(__u8 *)buffer,__LINE__);
5012 int yaffs_set_xattrib(yaffs_obj_t *obj, const YCHAR *name, const void * value, int size, int flags)
5014 return yaffs_do_xattrib_mod(obj, 1, name, value, size, flags);
5017 int yaffs_remove_xattrib(yaffs_obj_t *obj, const YCHAR *name)
5019 return yaffs_do_xattrib_mod(obj, 0, name, NULL, 0, 0);
5022 int yaffs_get_xattrib(yaffs_obj_t *obj, const YCHAR *name, void *value, int size)
5024 return yaffs_do_xattrib_fetch(obj, name, value, size);
5027 int yaffs_list_xattrib(yaffs_obj_t *obj, char *buffer, int size)
5029 return yaffs_do_xattrib_fetch(obj, NULL, buffer,size);
5035 int yaffs_dump_obj(yaffs_obj_t *obj)
5039 yaffs_get_obj_name(obj, name, YAFFS_MAX_NAME_LENGTH + 1);
5041 T(YAFFS_TRACE_ALWAYS,
5043 ("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d"
5044 " chunk %d type %d size %d\n"
5045 TENDSTR), obj->obj_id, yaffs_get_obj_inode(obj), name,
5046 obj->dirty, obj->valid, obj->serial, obj->sum, obj->hdr_chunk,
5047 yaffs_get_obj_type(obj), yaffs_get_obj_length(obj)));
5053 /*---------------------------- Initialisation code -------------------------------------- */
5055 static int yaffs_cehck_dev_fns(const yaffs_dev_t *dev)
5058 /* Common functions, gotta have */
5059 if (!dev->param.erase_fn || !dev->param.initialise_flash_fn)
5062 #ifdef CONFIG_YAFFS_YAFFS2
5064 /* Can use the "with tags" style interface for yaffs1 or yaffs2 */
5065 if (dev->param.write_chunk_tags_fn &&
5066 dev->param.read_chunk_tags_fn &&
5067 !dev->param.write_chunk_fn &&
5068 !dev->param.read_chunk_fn &&
5069 dev->param.bad_block_fn &&
5070 dev->param.query_block_fn)
5074 /* Can use the "spare" style interface for yaffs1 */
5075 if (!dev->param.is_yaffs2 &&
5076 !dev->param.write_chunk_tags_fn &&
5077 !dev->param.read_chunk_tags_fn &&
5078 dev->param.write_chunk_fn &&
5079 dev->param.read_chunk_fn &&
5080 !dev->param.bad_block_fn &&
5081 !dev->param.query_block_fn)
5088 static int yaffs_create_initial_dir(yaffs_dev_t *dev)
5090 /* Initialise the unlinked, deleted, root and lost and found directories */
5092 dev->lost_n_found = dev->root_dir = NULL;
5093 dev->unlinked_dir = dev->del_dir = NULL;
5096 yaffs_create_fake_dir(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
5099 yaffs_create_fake_dir(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
5102 yaffs_create_fake_dir(dev, YAFFS_OBJECTID_ROOT,
5103 YAFFS_ROOT_MODE | S_IFDIR);
5105 yaffs_create_fake_dir(dev, YAFFS_OBJECTID_LOSTNFOUND,
5106 YAFFS_LOSTNFOUND_MODE | S_IFDIR);
5108 if (dev->lost_n_found && dev->root_dir && dev->unlinked_dir && dev->del_dir) {
5109 yaffs_add_obj_to_dir(dev->root_dir, dev->lost_n_found);
5116 int yaffs_guts_initialise(yaffs_dev_t *dev)
5118 int init_failed = 0;
5122 T(YAFFS_TRACE_TRACING, (TSTR("yaffs: yaffs_guts_initialise()" TENDSTR)));
5124 /* Check stuff that must be set */
5127 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Need a device" TENDSTR)));
5131 dev->internal_start_block = dev->param.start_block;
5132 dev->internal_end_block = dev->param.end_block;
5133 dev->block_offset = 0;
5134 dev->chunk_offset = 0;
5135 dev->n_free_chunks = 0;
5139 if (dev->param.start_block == 0) {
5140 dev->internal_start_block = dev->param.start_block + 1;
5141 dev->internal_end_block = dev->param.end_block + 1;
5142 dev->block_offset = 1;
5143 dev->chunk_offset = dev->param.chunks_per_block;
5146 /* Check geometry parameters. */
5148 if ((!dev->param.inband_tags && dev->param.is_yaffs2 && dev->param.total_bytes_per_chunk < 1024) ||
5149 (!dev->param.is_yaffs2 && dev->param.total_bytes_per_chunk < 512) ||
5150 (dev->param.inband_tags && !dev->param.is_yaffs2) ||
5151 dev->param.chunks_per_block < 2 ||
5152 dev->param.n_reserved_blocks < 2 ||
5153 dev->internal_start_block <= 0 ||
5154 dev->internal_end_block <= 0 ||
5155 dev->internal_end_block <= (dev->internal_start_block + dev->param.n_reserved_blocks + 2)) { /* otherwise it is too small */
5156 T(YAFFS_TRACE_ALWAYS,
5158 ("yaffs: NAND geometry problems: chunk size %d, type is yaffs%s, inband_tags %d "
5159 TENDSTR), dev->param.total_bytes_per_chunk, dev->param.is_yaffs2 ? "2" : "", dev->param.inband_tags));
5163 if (yaffs_init_nand(dev) != YAFFS_OK) {
5164 T(YAFFS_TRACE_ALWAYS,
5165 (TSTR("yaffs: InitialiseNAND failed" TENDSTR)));
5169 /* Sort out space for inband tags, if required */
5170 if (dev->param.inband_tags)
5171 dev->data_bytes_per_chunk = dev->param.total_bytes_per_chunk - sizeof(yaffs_PackedTags2TagsPart);
5173 dev->data_bytes_per_chunk = dev->param.total_bytes_per_chunk;
5175 /* Got the right mix of functions? */
5176 if (!yaffs_cehck_dev_fns(dev)) {
5177 /* Function missing */
5178 T(YAFFS_TRACE_ALWAYS,
5180 ("yaffs: device function(s) missing or wrong\n" TENDSTR)));
5185 /* This is really a compilation check. */
5186 if (!yaffs_check_structures()) {
5187 T(YAFFS_TRACE_ALWAYS,
5188 (TSTR("yaffs_check_structures failed\n" TENDSTR)));
5192 if (dev->is_mounted) {
5193 T(YAFFS_TRACE_ALWAYS,
5194 (TSTR("yaffs: device already mounted\n" TENDSTR)));
5198 /* Finished with most checks. One or two more checks happen later on too. */
5200 dev->is_mounted = 1;
5202 /* OK now calculate a few things for the device */
5205 * Calculate all the chunk size manipulation numbers:
5207 x = dev->data_bytes_per_chunk;
5208 /* We always use dev->chunk_shift and dev->chunk_div */
5209 dev->chunk_shift = Shifts(x);
5210 x >>= dev->chunk_shift;
5212 /* We only use chunk mask if chunk_div is 1 */
5213 dev->chunk_mask = (1<<dev->chunk_shift) - 1;
5216 * Calculate chunk_grp_bits.
5217 * We need to find the next power of 2 > than internal_end_block
5220 x = dev->param.chunks_per_block * (dev->internal_end_block + 1);
5224 /* Set up tnode width if wide tnodes are enabled. */
5225 if (!dev->param.wide_tnodes_disabled) {
5226 /* bits must be even so that we end up with 32-bit words */
5230 dev->tnode_width = 16;
5232 dev->tnode_width = bits;
5234 dev->tnode_width = 16;
5236 dev->tnode_mask = (1<<dev->tnode_width)-1;
5238 /* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
5239 * so if the bitwidth of the
5240 * chunk range we're using is greater than 16 we need
5241 * to figure out chunk shift and chunk_grp_size
5244 if (bits <= dev->tnode_width)
5245 dev->chunk_grp_bits = 0;
5247 dev->chunk_grp_bits = bits - dev->tnode_width;
5249 dev->tnode_size = (dev->tnode_width * YAFFS_NTNODES_LEVEL0)/8;
5250 if(dev->tnode_size < sizeof(yaffs_tnode_t))
5251 dev->tnode_size = sizeof(yaffs_tnode_t);
5253 dev->chunk_grp_size = 1 << dev->chunk_grp_bits;
5255 if (dev->param.chunks_per_block < dev->chunk_grp_size) {
5256 /* We have a problem because the soft delete won't work if
5257 * the chunk group size > chunks per block.
5258 * This can be remedied by using larger "virtual blocks".
5260 T(YAFFS_TRACE_ALWAYS,
5261 (TSTR("yaffs: chunk group too large\n" TENDSTR)));
5266 /* OK, we've finished verifying the device, lets continue with initialisation */
5268 /* More device initialisation */
5270 dev->passive_gc_count = 0;
5271 dev->oldest_dirty_gc_count = 0;
5273 dev->gc_block_finder = 0;
5274 dev->buffered_block = -1;
5275 dev->doing_buffered_block_rewrite = 0;
5276 dev->n_deleted_files = 0;
5277 dev->n_bg_deletions = 0;
5278 dev->n_unlinked_files = 0;
5279 dev->n_ecc_fixed = 0;
5280 dev->n_ecc_unfixed = 0;
5281 dev->n_tags_ecc_fixed = 0;
5282 dev->n_tags_ecc_unfixed = 0;
5283 dev->n_erase_failures = 0;
5284 dev->n_erased_blocks = 0;
5286 dev->has_pending_prioritised_gc = 1; /* Assume the worst for now, will get fixed on first GC */
5287 YINIT_LIST_HEAD(&dev->dirty_dirs);
5288 dev->oldest_dirty_seq = 0;
5289 dev->oldest_dirty_block = 0;
5291 /* Initialise temporary buffers and caches. */
5292 if (!yaffs_init_tmp_buffers(dev))
5296 dev->gc_cleanup_list = NULL;
5300 dev->param.n_caches > 0) {
5303 int cacheBytes = dev->param.n_caches * sizeof(yaffs_cache_t);
5305 if (dev->param.n_caches > YAFFS_MAX_SHORT_OP_CACHES)
5306 dev->param.n_caches = YAFFS_MAX_SHORT_OP_CACHES;
5308 dev->cache = YMALLOC(cacheBytes);
5310 buf = (__u8 *) dev->cache;
5313 memset(dev->cache, 0, cacheBytes);
5315 for (i = 0; i < dev->param.n_caches && buf; i++) {
5316 dev->cache[i].object = NULL;
5317 dev->cache[i].last_use = 0;
5318 dev->cache[i].dirty = 0;
5319 dev->cache[i].data = buf = YMALLOC_DMA(dev->param.total_bytes_per_chunk);
5324 dev->cache_last_use = 0;
5327 dev->cache_hits = 0;
5330 dev->gc_cleanup_list = YMALLOC(dev->param.chunks_per_block * sizeof(__u32));
5331 if (!dev->gc_cleanup_list)
5335 if (dev->param.is_yaffs2)
5336 dev->param.use_header_file_size = 1;
5338 if (!init_failed && !yaffs_init_blocks(dev))
5341 yaffs_init_tnodes_and_objs(dev);
5343 if (!init_failed && !yaffs_create_initial_dir(dev))
5348 /* Now scan the flash. */
5349 if (dev->param.is_yaffs2) {
5350 if (yaffs2_checkpt_restore(dev)) {
5351 yaffs_check_obj_details_loaded(dev->root_dir);
5352 T(YAFFS_TRACE_ALWAYS,
5353 (TSTR("yaffs: restored from checkpoint" TENDSTR)));
5356 /* Clean up the mess caused by an aborted checkpoint load
5357 * and scan backwards.
5359 yaffs_deinit_blocks(dev);
5361 yaffs_deinit_tnodes_and_objs(dev);
5363 dev->n_erased_blocks = 0;
5364 dev->n_free_chunks = 0;
5365 dev->alloc_block = -1;
5366 dev->alloc_page = -1;
5367 dev->n_deleted_files = 0;
5368 dev->n_unlinked_files = 0;
5369 dev->n_bg_deletions = 0;
5371 if (!init_failed && !yaffs_init_blocks(dev))
5374 yaffs_init_tnodes_and_objs(dev);
5376 if (!init_failed && !yaffs_create_initial_dir(dev))
5379 if (!init_failed && !yaffs2_scan_backwards(dev))
5382 } else if (!yaffs1_scan(dev))
5385 yaffs_strip_deleted_objs(dev);
5386 yaffs_fix_hanging_objs(dev);
5387 if(dev->param.empty_lost_n_found)
5388 yaffs_empty_l_n_f(dev);
5392 /* Clean up the mess */
5393 T(YAFFS_TRACE_TRACING,
5394 (TSTR("yaffs: yaffs_guts_initialise() aborted.\n" TENDSTR)));
5396 yaffs_deinitialise(dev);
5400 /* Zero out stats */
5401 dev->n_page_reads = 0;
5402 dev->n_page_writes = 0;
5403 dev->n_erasures = 0;
5404 dev->n_gc_copies = 0;
5405 dev->n_retired_writes = 0;
5407 dev->n_retired_blocks = 0;
5409 yaffs_verify_free_chunks(dev);
5410 yaffs_verify_blocks(dev);
5412 /* Clean up any aborted checkpoint data */
5413 if(!dev->is_checkpointed && dev->blocks_in_checkpt > 0)
5414 yaffs2_checkpt_invalidate(dev);
5416 T(YAFFS_TRACE_TRACING,
5417 (TSTR("yaffs: yaffs_guts_initialise() done.\n" TENDSTR)));
5422 void yaffs_deinitialise(yaffs_dev_t *dev)
5424 if (dev->is_mounted) {
5427 yaffs_deinit_blocks(dev);
5428 yaffs_deinit_tnodes_and_objs(dev);
5429 if (dev->param.n_caches > 0 &&
5432 for (i = 0; i < dev->param.n_caches; i++) {
5433 if (dev->cache[i].data)
5434 YFREE(dev->cache[i].data);
5435 dev->cache[i].data = NULL;
5442 YFREE(dev->gc_cleanup_list);
5444 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
5445 YFREE(dev->temp_buffer[i].buffer);
5447 dev->is_mounted = 0;
5449 if (dev->param.deinitialise_flash_fn)
5450 dev->param.deinitialise_flash_fn(dev);
5454 int yaffs_count_free_chunks(yaffs_dev_t *dev)
5459 yaffs_block_info_t *blk;
5461 blk = dev->block_info;
5462 for (b = dev->internal_start_block; b <= dev->internal_end_block; b++) {
5463 switch (blk->block_state) {
5464 case YAFFS_BLOCK_STATE_EMPTY:
5465 case YAFFS_BLOCK_STATE_ALLOCATING:
5466 case YAFFS_BLOCK_STATE_COLLECTING:
5467 case YAFFS_BLOCK_STATE_FULL:
5469 (dev->param.chunks_per_block - blk->pages_in_use +
5470 blk->soft_del_pages);
5481 int yaffs_get_n_free_chunks(yaffs_dev_t *dev)
5483 /* This is what we report to the outside world */
5486 int nDirtyCacheChunks;
5487 int blocksForCheckpoint;
5491 nFree = dev->n_free_chunks;
5493 nFree = yaffs_count_free_chunks(dev);
5496 nFree += dev->n_deleted_files;
5498 /* Now count the number of dirty chunks in the cache and subtract those */
5500 for (nDirtyCacheChunks = 0, i = 0; i < dev->param.n_caches; i++) {
5501 if (dev->cache[i].dirty)
5502 nDirtyCacheChunks++;
5505 nFree -= nDirtyCacheChunks;
5507 nFree -= ((dev->param.n_reserved_blocks + 1) * dev->param.chunks_per_block);
5509 /* Now we figure out how much to reserve for the checkpoint and report that... */
5510 blocksForCheckpoint = yaffs_calc_checkpt_blocks_required(dev);
5512 nFree -= (blocksForCheckpoint * dev->param.chunks_per_block);
5522 /*---------------------------------------- YAFFS test code ----------------------*/
5524 #define yaffs_check_struct(structure, syze, name) \
5526 if (sizeof(structure) != syze) { \
5527 T(YAFFS_TRACE_ALWAYS, (TSTR("%s should be %d but is %d\n" TENDSTR),\
5528 name, syze, (int) sizeof(structure))); \
5529 return YAFFS_FAIL; \
5533 static int yaffs_check_structures(void)
5535 /* yaffs_check_struct(yaffs_tags_t,8,"yaffs_tags_t"); */
5536 /* yaffs_check_struct(yaffs_tags_union_t,8,"yaffs_tags_union_t"); */
5537 /* yaffs_check_struct(yaffs_spare,16,"yaffs_spare"); */
5538 /* yaffs_check_struct(yaffs_tnode_t, 2 * YAFFS_NTNODES_LEVEL0, "yaffs_tnode_t"); */
5540 #ifndef CONFIG_YAFFS_WINCE
5541 yaffs_check_struct(yaffs_obj_header, 512, "yaffs_obj_header");