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.
15 #include "yaffs_trace.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 #include "yaffs_attribs.h"
38 /* Note YAFFS_GC_GOOD_ENOUGH must be <= YAFFS_GC_PASSIVE_THRESHOLD */
39 #define YAFFS_GC_GOOD_ENOUGH 2
40 #define YAFFS_GC_PASSIVE_THRESHOLD 4
42 #include "yaffs_ecc.h"
44 /* Robustification (if it ever comes about...) */
45 static void yaffs_retire_block(struct yaffs_dev *dev, int flash_block);
46 static void yaffs_handle_chunk_wr_error(struct yaffs_dev *dev, int nand_chunk,
48 static void yaffs_handle_chunk_wr_ok(struct yaffs_dev *dev, int nand_chunk,
50 const struct yaffs_ext_tags *tags);
51 static void yaffs_handle_chunk_update(struct yaffs_dev *dev, int nand_chunk,
52 const struct yaffs_ext_tags *tags);
54 /* Other local prototypes */
55 static void yaffs_update_parent(struct yaffs_obj *obj);
56 static int yaffs_unlink_obj(struct yaffs_obj *obj);
57 static int yaffs_obj_cache_dirty(struct yaffs_obj *obj);
59 static int yaffs_write_new_chunk(struct yaffs_dev *dev,
61 struct yaffs_ext_tags *tags, int use_reserver);
63 static struct yaffs_obj *yaffs_new_obj(struct yaffs_dev *dev, int number,
64 enum yaffs_obj_type type);
66 static int yaffs_apply_xattrib_mod(struct yaffs_obj *obj, char *buffer,
67 struct yaffs_xattr_mod *xmod);
69 static void yaffs_remove_obj_from_dir(struct yaffs_obj *obj);
70 static int yaffs_generic_obj_del(struct yaffs_obj *in);
72 static int yaffs_check_chunk_erased(struct yaffs_dev *dev, int nand_chunk);
74 static int yaffs_unlink_worker(struct yaffs_obj *obj);
76 static int yaffs_tags_match(const struct yaffs_ext_tags *tags, int obj_id,
79 static int yaffs_alloc_chunk(struct yaffs_dev *dev, int use_reserver,
80 struct yaffs_block_info **block_ptr);
82 static void yaffs_check_obj_details_loaded(struct yaffs_obj *in);
84 static void yaffs_invalidate_whole_cache(struct yaffs_obj *in);
85 static void yaffs_invalidate_chunk_cache(struct yaffs_obj *object,
88 static int yaffs_find_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
89 struct yaffs_ext_tags *tags);
91 static int yaffs_verify_chunk_written(struct yaffs_dev *dev,
94 struct yaffs_ext_tags *tags);
96 static void yaffs_load_name_from_oh(struct yaffs_dev *dev, YCHAR * name,
97 const YCHAR * oh_name, int buff_size);
98 static void yaffs_load_oh_from_name(struct yaffs_dev *dev, YCHAR * oh_name,
101 /* Function to calculate chunk and offset */
103 static void yaffs_addr_to_chunk(struct yaffs_dev *dev, loff_t addr,
104 int *chunk_out, u32 * offset_out)
109 chunk = (u32) (addr >> dev->chunk_shift);
111 if (dev->chunk_div == 1) {
112 /* easy power of 2 case */
113 offset = (u32) (addr & dev->chunk_mask);
115 /* Non power-of-2 case */
119 chunk /= dev->chunk_div;
121 chunk_base = ((loff_t) chunk) * dev->data_bytes_per_chunk;
122 offset = (u32) (addr - chunk_base);
126 *offset_out = offset;
129 /* Function to return the number of shifts for a power of 2 greater than or
130 * equal to the given number
131 * Note we don't try to cater for all possible numbers and this does not have to
132 * be hellishly efficient.
135 static u32 calc_shifts_ceiling(u32 x)
140 shifts = extra_bits = 0;
155 /* Function to return the number of shifts to get a 1 in bit 0
158 static u32 calc_shifts(u32 x)
176 * Temporary buffer manipulations.
179 static int yaffs_init_tmp_buffers(struct yaffs_dev *dev)
184 memset(dev->temp_buffer, 0, sizeof(dev->temp_buffer));
186 for (i = 0; buf && i < YAFFS_N_TEMP_BUFFERS; i++) {
187 dev->temp_buffer[i].line = 0; /* not in use */
188 dev->temp_buffer[i].buffer = buf =
189 YMALLOC_DMA(dev->param.total_bytes_per_chunk);
192 return buf ? YAFFS_OK : YAFFS_FAIL;
195 u8 *yaffs_get_temp_buffer(struct yaffs_dev * dev, int line_no)
200 if (dev->temp_in_use > dev->max_temp)
201 dev->max_temp = dev->temp_in_use;
203 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
204 if (dev->temp_buffer[i].line == 0) {
205 dev->temp_buffer[i].line = line_no;
206 if ((i + 1) > dev->max_temp) {
207 dev->max_temp = i + 1;
208 for (j = 0; j <= i; j++)
209 dev->temp_buffer[j].max_line =
210 dev->temp_buffer[j].line;
213 return dev->temp_buffer[i].buffer;
217 T(YAFFS_TRACE_BUFFERS,
218 (TSTR("Out of temp buffers at line %d, other held by lines:"),
220 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
221 T(YAFFS_TRACE_BUFFERS,
222 (TSTR(" %d "), dev->temp_buffer[i].line));
224 T(YAFFS_TRACE_BUFFERS, (TSTR(" " TENDSTR)));
227 * If we got here then we have to allocate an unmanaged one
231 dev->unmanaged_buffer_allocs++;
232 return YMALLOC(dev->data_bytes_per_chunk);
236 void yaffs_release_temp_buffer(struct yaffs_dev *dev, u8 * buffer, int line_no)
242 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
243 if (dev->temp_buffer[i].buffer == buffer) {
244 dev->temp_buffer[i].line = 0;
250 /* assume it is an unmanaged one. */
251 T(YAFFS_TRACE_BUFFERS,
252 (TSTR("Releasing unmanaged temp buffer in line %d" TENDSTR),
255 dev->unmanaged_buffer_deallocs++;
261 * Determine if we have a managed buffer.
263 int yaffs_is_managed_tmp_buffer(struct yaffs_dev *dev, const u8 * buffer)
267 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
268 if (dev->temp_buffer[i].buffer == buffer)
272 for (i = 0; i < dev->param.n_caches; i++) {
273 if (dev->cache[i].data == buffer)
277 if (buffer == dev->checkpt_buffer)
280 T(YAFFS_TRACE_ALWAYS,
281 (TSTR("yaffs: unmaged buffer detected.\n" TENDSTR)));
290 * Simple hash function. Needs to have a reasonable spread
293 static Y_INLINE int yaffs_hash_fn(int n)
296 return n % YAFFS_NOBJECT_BUCKETS;
300 * Access functions to useful fake objects.
301 * Note that root might have a presence in NAND if permissions are set.
304 struct yaffs_obj *yaffs_root(struct yaffs_dev *dev)
306 return dev->root_dir;
309 struct yaffs_obj *yaffs_lost_n_found(struct yaffs_dev *dev)
311 return dev->lost_n_found;
315 * Erased NAND checking functions
318 int yaffs_check_ff(u8 * buffer, int n_bytes)
320 /* Horrible, slow implementation */
329 static int yaffs_check_chunk_erased(struct yaffs_dev *dev, int nand_chunk)
331 int retval = YAFFS_OK;
332 u8 *data = yaffs_get_temp_buffer(dev, __LINE__);
333 struct yaffs_ext_tags tags;
336 result = yaffs_rd_chunk_tags_nand(dev, nand_chunk, data, &tags);
338 if (tags.ecc_result > YAFFS_ECC_RESULT_NO_ERROR)
341 if (!yaffs_check_ff(data, dev->data_bytes_per_chunk) || tags.chunk_used) {
342 T(YAFFS_TRACE_NANDACCESS,
343 (TSTR("Chunk %d not erased" TENDSTR), nand_chunk));
347 yaffs_release_temp_buffer(dev, data, __LINE__);
353 static int yaffs_verify_chunk_written(struct yaffs_dev *dev,
356 struct yaffs_ext_tags *tags)
358 int retval = YAFFS_OK;
359 struct yaffs_ext_tags temp_tags;
360 u8 *buffer = yaffs_get_temp_buffer(dev, __LINE__);
363 result = yaffs_rd_chunk_tags_nand(dev, nand_chunk, buffer, &temp_tags);
364 if (memcmp(buffer, data, dev->data_bytes_per_chunk) ||
365 temp_tags.obj_id != tags->obj_id ||
366 temp_tags.chunk_id != tags->chunk_id ||
367 temp_tags.n_bytes != tags->n_bytes)
370 yaffs_release_temp_buffer(dev, buffer, __LINE__);
375 static int yaffs_write_new_chunk(struct yaffs_dev *dev,
377 struct yaffs_ext_tags *tags, int use_reserver)
383 yaffs2_checkpt_invalidate(dev);
386 struct yaffs_block_info *bi = 0;
389 chunk = yaffs_alloc_chunk(dev, use_reserver, &bi);
395 /* First check this chunk is erased, if it needs
396 * checking. The checking policy (unless forced
397 * always on) is as follows:
399 * Check the first page we try to write in a block.
400 * If the check passes then we don't need to check any
401 * more. If the check fails, we check again...
402 * If the block has been erased, we don't need to check.
404 * However, if the block has been prioritised for gc,
405 * then we think there might be something odd about
406 * this block and stop using it.
408 * Rationale: We should only ever see chunks that have
409 * not been erased if there was a partially written
410 * chunk due to power loss. This checking policy should
411 * catch that case with very few checks and thus save a
412 * lot of checks that are most likely not needed.
415 * If an erase check fails or the write fails we skip the
419 /* let's give it a try */
422 if (dev->param.always_check_erased)
423 bi->skip_erased_check = 0;
425 if (!bi->skip_erased_check) {
426 erased_ok = yaffs_check_chunk_erased(dev, chunk);
427 if (erased_ok != YAFFS_OK) {
429 (TSTR("**>> yaffs chunk %d was not erased"
432 /* If not erased, delete this one,
433 * skip rest of block and
434 * try another chunk */
435 yaffs_chunk_del(dev, chunk, 1, __LINE__);
436 yaffs_skip_rest_of_block(dev);
441 write_ok = yaffs_wr_chunk_tags_nand(dev, chunk, data, tags);
443 if (!bi->skip_erased_check)
445 yaffs_verify_chunk_written(dev, chunk, data, tags);
447 if (write_ok != YAFFS_OK) {
448 /* Clean up aborted write, skip to next block and
449 * try another chunk */
450 yaffs_handle_chunk_wr_error(dev, chunk, erased_ok);
454 bi->skip_erased_check = 1;
456 /* Copy the data into the robustification buffer */
457 yaffs_handle_chunk_wr_ok(dev, chunk, data, tags);
459 } while (write_ok != YAFFS_OK &&
460 (yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts));
467 (TSTR("**>> yaffs write required %d attempts" TENDSTR),
470 dev->n_retired_writes += (attempts - 1);
477 * Block retiring for handling a broken block.
480 static void yaffs_retire_block(struct yaffs_dev *dev, int flash_block)
482 struct yaffs_block_info *bi = yaffs_get_block_info(dev, flash_block);
484 yaffs2_checkpt_invalidate(dev);
486 yaffs2_clear_oldest_dirty_seq(dev, bi);
488 if (yaffs_mark_bad(dev, flash_block) != YAFFS_OK) {
489 if (yaffs_erase_block(dev, flash_block) != YAFFS_OK) {
490 T(YAFFS_TRACE_ALWAYS,
492 ("yaffs: Failed to mark bad and erase block %d"
493 TENDSTR), flash_block));
495 struct yaffs_ext_tags tags;
497 flash_block * dev->param.chunks_per_block;
499 u8 *buffer = yaffs_get_temp_buffer(dev, __LINE__);
501 memset(buffer, 0xff, dev->data_bytes_per_chunk);
502 yaffs_init_tags(&tags);
503 tags.seq_number = YAFFS_SEQUENCE_BAD_BLOCK;
504 if (dev->param.write_chunk_tags_fn(dev, chunk_id -
508 T(YAFFS_TRACE_ALWAYS,
511 TCONT("write bad block marker to block %d")
512 TENDSTR), flash_block));
514 yaffs_release_temp_buffer(dev, buffer, __LINE__);
518 bi->block_state = YAFFS_BLOCK_STATE_DEAD;
519 bi->gc_prioritise = 0;
520 bi->needs_retiring = 0;
522 dev->n_retired_blocks++;
526 * Functions for robustisizing TODO
530 static void yaffs_handle_chunk_wr_ok(struct yaffs_dev *dev, int nand_chunk,
532 const struct yaffs_ext_tags *tags)
535 nand_chunk = nand_chunk;
540 static void yaffs_handle_chunk_update(struct yaffs_dev *dev, int nand_chunk,
541 const struct yaffs_ext_tags *tags)
544 nand_chunk = nand_chunk;
548 void yaffs_handle_chunk_error(struct yaffs_dev *dev,
549 struct yaffs_block_info *bi)
551 if (!bi->gc_prioritise) {
552 bi->gc_prioritise = 1;
553 dev->has_pending_prioritised_gc = 1;
554 bi->chunk_error_strikes++;
556 if (bi->chunk_error_strikes > 3) {
557 bi->needs_retiring = 1; /* Too many stikes, so retire this */
558 T(YAFFS_TRACE_ALWAYS,
559 (TSTR("yaffs: Block struck out" TENDSTR)));
565 static void yaffs_handle_chunk_wr_error(struct yaffs_dev *dev, int nand_chunk,
568 int flash_block = nand_chunk / dev->param.chunks_per_block;
569 struct yaffs_block_info *bi = yaffs_get_block_info(dev, flash_block);
571 yaffs_handle_chunk_error(dev, bi);
574 /* Was an actual write failure, so mark the block for retirement */
575 bi->needs_retiring = 1;
576 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
577 (TSTR("**>> Block %d needs retiring" TENDSTR), flash_block));
580 /* Delete the chunk */
581 yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
582 yaffs_skip_rest_of_block(dev);
585 /*---------------- Name handling functions ------------*/
587 static u16 yaffs_calc_name_sum(const YCHAR * name)
592 const YUCHAR *bname = (const YUCHAR *)name;
594 while ((*bname) && (i < (YAFFS_MAX_NAME_LENGTH / 2))) {
596 /* 0x1f mask is case insensitive */
597 sum += ((*bname) & 0x1f) * i;
605 void yaffs_set_obj_name(struct yaffs_obj *obj, const YCHAR * name)
607 #ifndef CONFIG_YAFFS_NO_SHORT_NAMES
608 memset(obj->short_name, 0, sizeof(obj->short_name));
610 yaffs_strnlen(name, YAFFS_SHORT_NAME_LENGTH + 1) <=
611 YAFFS_SHORT_NAME_LENGTH)
612 yaffs_strcpy(obj->short_name, name);
614 obj->short_name[0] = _Y('\0');
616 obj->sum = yaffs_calc_name_sum(name);
619 void yaffs_set_obj_name_from_oh(struct yaffs_obj *obj,
620 const struct yaffs_obj_hdr *oh)
622 #ifdef CONFIG_YAFFS_AUTO_UNICODE
623 YCHAR tmp_name[YAFFS_MAX_NAME_LENGTH + 1];
624 memset(tmp_name, 0, sizeof(tmp_name));
625 yaffs_load_name_from_oh(obj->my_dev, tmp_name, oh->name,
626 YAFFS_MAX_NAME_LENGTH + 1);
627 yaffs_set_obj_name(obj, tmp_name);
629 yaffs_set_obj_name(obj, oh->name);
633 /*-------------------- TNODES -------------------
635 * List of spare tnodes
636 * The list is hooked together using the first pointer
640 struct yaffs_tnode *yaffs_get_tnode(struct yaffs_dev *dev)
642 struct yaffs_tnode *tn = yaffs_alloc_raw_tnode(dev);
644 memset(tn, 0, dev->tnode_size);
648 dev->checkpoint_blocks_required = 0; /* force recalculation */
653 /* FreeTnode frees up a tnode and puts it back on the free list */
654 static void yaffs_free_tnode(struct yaffs_dev *dev, struct yaffs_tnode *tn)
656 yaffs_free_raw_tnode(dev, tn);
658 dev->checkpoint_blocks_required = 0; /* force recalculation */
661 static void yaffs_deinit_tnodes_and_objs(struct yaffs_dev *dev)
663 yaffs_deinit_raw_tnodes_and_objs(dev);
668 void yaffs_load_tnode_0(struct yaffs_dev *dev, struct yaffs_tnode *tn,
669 unsigned pos, unsigned val)
671 u32 *map = (u32 *) tn;
677 pos &= YAFFS_TNODES_LEVEL0_MASK;
678 val >>= dev->chunk_grp_bits;
680 bit_in_map = pos * dev->tnode_width;
681 word_in_map = bit_in_map / 32;
682 bit_in_word = bit_in_map & (32 - 1);
684 mask = dev->tnode_mask << bit_in_word;
686 map[word_in_map] &= ~mask;
687 map[word_in_map] |= (mask & (val << bit_in_word));
689 if (dev->tnode_width > (32 - bit_in_word)) {
690 bit_in_word = (32 - bit_in_word);
693 dev->tnode_mask >> ( /*dev->tnode_width - */ bit_in_word);
694 map[word_in_map] &= ~mask;
695 map[word_in_map] |= (mask & (val >> bit_in_word));
699 u32 yaffs_get_group_base(struct yaffs_dev *dev, struct yaffs_tnode *tn,
702 u32 *map = (u32 *) tn;
708 pos &= YAFFS_TNODES_LEVEL0_MASK;
710 bit_in_map = pos * dev->tnode_width;
711 word_in_map = bit_in_map / 32;
712 bit_in_word = bit_in_map & (32 - 1);
714 val = map[word_in_map] >> bit_in_word;
716 if (dev->tnode_width > (32 - bit_in_word)) {
717 bit_in_word = (32 - bit_in_word);
719 val |= (map[word_in_map] << bit_in_word);
722 val &= dev->tnode_mask;
723 val <<= dev->chunk_grp_bits;
728 /* ------------------- End of individual tnode manipulation -----------------*/
730 /* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
731 * The look up tree is represented by the top tnode and the number of top_level
732 * in the tree. 0 means only the level 0 tnode is in the tree.
735 /* FindLevel0Tnode finds the level 0 tnode, if one exists. */
736 struct yaffs_tnode *yaffs_find_tnode_0(struct yaffs_dev *dev,
737 struct yaffs_file_var *file_struct,
740 struct yaffs_tnode *tn = file_struct->top;
743 int level = file_struct->top_level;
747 /* Check sane level and chunk Id */
748 if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL)
751 if (chunk_id > YAFFS_MAX_CHUNK_ID)
754 /* First check we're tall enough (ie enough top_level) */
756 i = chunk_id >> YAFFS_TNODES_LEVEL0_BITS;
759 i >>= YAFFS_TNODES_INTERNAL_BITS;
763 if (required_depth > file_struct->top_level)
764 return NULL; /* Not tall enough, so we can't find it */
766 /* Traverse down to level 0 */
767 while (level > 0 && tn) {
768 tn = tn->internal[(chunk_id >>
769 (YAFFS_TNODES_LEVEL0_BITS +
771 YAFFS_TNODES_INTERNAL_BITS)) &
772 YAFFS_TNODES_INTERNAL_MASK];
779 /* AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.
780 * This happens in two steps:
781 * 1. If the tree isn't tall enough, then make it taller.
782 * 2. Scan down the tree towards the level 0 tnode adding tnodes if required.
784 * Used when modifying the tree.
786 * If the tn argument is NULL, then a fresh tnode will be added otherwise the specified tn will
787 * be plugged into the ttree.
790 struct yaffs_tnode *yaffs_add_find_tnode_0(struct yaffs_dev *dev,
791 struct yaffs_file_var *file_struct,
793 struct yaffs_tnode *passed_tn)
798 struct yaffs_tnode *tn;
802 /* Check sane level and page Id */
803 if (file_struct->top_level < 0
804 || file_struct->top_level > YAFFS_TNODES_MAX_LEVEL)
807 if (chunk_id > YAFFS_MAX_CHUNK_ID)
810 /* First check we're tall enough (ie enough top_level) */
812 x = chunk_id >> YAFFS_TNODES_LEVEL0_BITS;
815 x >>= YAFFS_TNODES_INTERNAL_BITS;
819 if (required_depth > file_struct->top_level) {
820 /* Not tall enough, gotta make the tree taller */
821 for (i = file_struct->top_level; i < required_depth; i++) {
823 tn = yaffs_get_tnode(dev);
826 tn->internal[0] = file_struct->top;
827 file_struct->top = tn;
828 file_struct->top_level++;
831 (TSTR("yaffs: no more tnodes" TENDSTR)));
837 /* Traverse down to level 0, adding anything we need */
839 l = file_struct->top_level;
840 tn = file_struct->top;
843 while (l > 0 && tn) {
845 (YAFFS_TNODES_LEVEL0_BITS +
846 (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
847 YAFFS_TNODES_INTERNAL_MASK;
849 if ((l > 1) && !tn->internal[x]) {
850 /* Add missing non-level-zero tnode */
851 tn->internal[x] = yaffs_get_tnode(dev);
852 if (!tn->internal[x])
855 /* Looking from level 1 at level 0 */
857 /* If we already have one, then release it. */
859 yaffs_free_tnode(dev,
862 tn->internal[x] = passed_tn;
864 } else if (!tn->internal[x]) {
865 /* Don't have one, none passed in */
866 tn->internal[x] = yaffs_get_tnode(dev);
867 if (!tn->internal[x])
872 tn = tn->internal[x];
878 memcpy(tn, passed_tn,
879 (dev->tnode_width * YAFFS_NTNODES_LEVEL0) / 8);
880 yaffs_free_tnode(dev, passed_tn);
887 static int yaffs_find_chunk_in_group(struct yaffs_dev *dev, int the_chunk,
888 struct yaffs_ext_tags *tags, int obj_id,
893 for (j = 0; the_chunk && j < dev->chunk_grp_size; j++) {
894 if (yaffs_check_chunk_bit
895 (dev, the_chunk / dev->param.chunks_per_block,
896 the_chunk % dev->param.chunks_per_block)) {
898 if (dev->chunk_grp_size == 1)
901 yaffs_rd_chunk_tags_nand(dev, the_chunk, NULL,
903 if (yaffs_tags_match(tags, obj_id, inode_chunk)) {
914 static void yaffs_soft_del_chunk(struct yaffs_dev *dev, int chunk)
916 struct yaffs_block_info *the_block;
919 T(YAFFS_TRACE_DELETION, (TSTR("soft delete chunk %d" TENDSTR), chunk));
921 block_no = chunk / dev->param.chunks_per_block;
922 the_block = yaffs_get_block_info(dev, block_no);
924 the_block->soft_del_pages++;
925 dev->n_free_chunks++;
926 yaffs2_update_oldest_dirty_seq(dev, block_no, the_block);
930 /* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
931 * All soft deleting does is increment the block's softdelete count and pulls the chunk out
933 * Thus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
936 static int yaffs_soft_del_worker(struct yaffs_obj *in, struct yaffs_tnode *tn,
937 u32 level, int chunk_offset)
942 struct yaffs_dev *dev = in->my_dev;
947 for (i = YAFFS_NTNODES_INTERNAL - 1; all_done && i >= 0;
949 if (tn->internal[i]) {
951 yaffs_soft_del_worker(in,
957 YAFFS_TNODES_INTERNAL_BITS)
960 yaffs_free_tnode(dev,
963 tn->internal[i] = NULL;
965 /* Hoosterman... how could this happen? */
969 return (all_done) ? 1 : 0;
970 } else if (level == 0) {
972 for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
973 the_chunk = yaffs_get_group_base(dev, tn, i);
975 /* Note this does not find the real chunk, only the chunk group.
976 * We make an assumption that a chunk group is not larger than
979 yaffs_soft_del_chunk(dev, the_chunk);
980 yaffs_load_tnode_0(dev, tn, i, 0);
994 static void yaffs_soft_del_file(struct yaffs_obj *obj)
997 obj->variant_type == YAFFS_OBJECT_TYPE_FILE && !obj->soft_del) {
998 if (obj->n_data_chunks <= 0) {
999 /* Empty file with no duplicate object headers, just delete it immediately */
1000 yaffs_free_tnode(obj->my_dev,
1001 obj->variant.file_variant.top);
1002 obj->variant.file_variant.top = NULL;
1003 T(YAFFS_TRACE_TRACING,
1004 (TSTR("yaffs: Deleting empty file %d" TENDSTR),
1006 yaffs_generic_obj_del(obj);
1008 yaffs_soft_del_worker(obj,
1009 obj->variant.file_variant.top,
1011 file_variant.top_level, 0);
1017 /* Pruning removes any part of the file structure tree that is beyond the
1018 * bounds of the file (ie that does not point to chunks).
1020 * A file should only get pruned when its size is reduced.
1022 * Before pruning, the chunks must be pulled from the tree and the
1023 * level 0 tnode entries must be zeroed out.
1024 * Could also use this for file deletion, but that's probably better handled
1025 * by a special case.
1027 * This function is recursive. For levels > 0 the function is called again on
1028 * any sub-tree. For level == 0 we just check if the sub-tree has data.
1029 * If there is no data in a subtree then it is pruned.
1032 static struct yaffs_tnode *yaffs_prune_worker(struct yaffs_dev *dev,
1033 struct yaffs_tnode *tn, u32 level,
1043 for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
1044 if (tn->internal[i]) {
1046 yaffs_prune_worker(dev,
1053 if (tn->internal[i])
1057 int tnode_size_u32 = dev->tnode_size / sizeof(u32);
1058 u32 *map = (u32 *) tn;
1060 for (i = 0; !has_data && i < tnode_size_u32; i++) {
1066 if (has_data == 0 && del0) {
1067 /* Free and return NULL */
1069 yaffs_free_tnode(dev, tn);
1079 static int yaffs_prune_tree(struct yaffs_dev *dev,
1080 struct yaffs_file_var *file_struct)
1085 struct yaffs_tnode *tn;
1087 if (file_struct->top_level > 0) {
1089 yaffs_prune_worker(dev, file_struct->top,
1090 file_struct->top_level, 0);
1092 /* Now we have a tree with all the non-zero branches NULL but the height
1093 * is the same as it was.
1094 * Let's see if we can trim internal tnodes to shorten the tree.
1095 * We can do this if only the 0th element in the tnode is in use
1096 * (ie all the non-zero are NULL)
1099 while (file_struct->top_level && !done) {
1100 tn = file_struct->top;
1103 for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
1104 if (tn->internal[i])
1109 file_struct->top = tn->internal[0];
1110 file_struct->top_level--;
1111 yaffs_free_tnode(dev, tn);
1121 /*-------------------- End of File Structure functions.-------------------*/
1123 /* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */
1124 static struct yaffs_obj *yaffs_alloc_empty_obj(struct yaffs_dev *dev)
1126 struct yaffs_obj *obj = yaffs_alloc_raw_obj(dev);
1131 /* Now sweeten it up... */
1133 memset(obj, 0, sizeof(struct yaffs_obj));
1134 obj->being_created = 1;
1138 obj->variant_type = YAFFS_OBJECT_TYPE_UNKNOWN;
1139 INIT_LIST_HEAD(&(obj->hard_links));
1140 INIT_LIST_HEAD(&(obj->hash_link));
1141 INIT_LIST_HEAD(&obj->siblings);
1143 /* Now make the directory sane */
1144 if (dev->root_dir) {
1145 obj->parent = dev->root_dir;
1146 list_add(&(obj->siblings),
1147 &dev->root_dir->variant.dir_variant.children);
1150 /* Add it to the lost and found directory.
1151 * NB Can't put root or lost-n-found in lost-n-found so
1152 * check if lost-n-found exists first
1154 if (dev->lost_n_found)
1155 yaffs_add_obj_to_dir(dev->lost_n_found, obj);
1157 obj->being_created = 0;
1160 dev->checkpoint_blocks_required = 0; /* force recalculation */
1165 static struct yaffs_obj *yaffs_create_fake_dir(struct yaffs_dev *dev,
1166 int number, u32 mode)
1169 struct yaffs_obj *obj =
1170 yaffs_new_obj(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
1172 obj->fake = 1; /* it is fake so it might have no NAND presence... */
1173 obj->rename_allowed = 0; /* ... and we're not allowed to rename it... */
1174 obj->unlink_allowed = 0; /* ... or unlink it */
1177 obj->yst_mode = mode;
1179 obj->hdr_chunk = 0; /* Not a valid chunk. */
1186 static void yaffs_unhash_obj(struct yaffs_obj *obj)
1189 struct yaffs_dev *dev = obj->my_dev;
1191 /* If it is still linked into the bucket list, free from the list */
1192 if (!list_empty(&obj->hash_link)) {
1193 list_del_init(&obj->hash_link);
1194 bucket = yaffs_hash_fn(obj->obj_id);
1195 dev->obj_bucket[bucket].count--;
1199 /* FreeObject frees up a Object and puts it back on the free list */
1200 static void yaffs_free_obj(struct yaffs_obj *obj)
1202 struct yaffs_dev *dev = obj->my_dev;
1205 (TSTR("FreeObject %p inode %p" TENDSTR), obj, obj->my_inode));
1211 if (!list_empty(&obj->siblings))
1214 if (obj->my_inode) {
1215 /* We're still hooked up to a cached inode.
1216 * Don't delete now, but mark for later deletion
1218 obj->defered_free = 1;
1222 yaffs_unhash_obj(obj);
1224 yaffs_free_raw_obj(dev, obj);
1226 dev->checkpoint_blocks_required = 0; /* force recalculation */
1229 void yaffs_handle_defered_free(struct yaffs_obj *obj)
1231 if (obj->defered_free)
1232 yaffs_free_obj(obj);
1235 static void yaffs_init_tnodes_and_objs(struct yaffs_dev *dev)
1242 yaffs_init_raw_tnodes_and_objs(dev);
1244 for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
1245 INIT_LIST_HEAD(&dev->obj_bucket[i].list);
1246 dev->obj_bucket[i].count = 0;
1250 static int yaffs_find_nice_bucket(struct yaffs_dev *dev)
1254 int lowest = 999999;
1256 /* Search for the shortest list or one that
1260 for (i = 0; i < 10 && lowest > 4; i++) {
1261 dev->bucket_finder++;
1262 dev->bucket_finder %= YAFFS_NOBJECT_BUCKETS;
1263 if (dev->obj_bucket[dev->bucket_finder].count < lowest) {
1264 lowest = dev->obj_bucket[dev->bucket_finder].count;
1265 l = dev->bucket_finder;
1273 static int yaffs_new_obj_id(struct yaffs_dev *dev)
1275 int bucket = yaffs_find_nice_bucket(dev);
1277 /* Now find an object value that has not already been taken
1278 * by scanning the list.
1282 struct list_head *i;
1284 u32 n = (u32) bucket;
1286 /* yaffs_check_obj_hash_sane(); */
1290 n += YAFFS_NOBJECT_BUCKETS;
1291 if (1 || dev->obj_bucket[bucket].count > 0) {
1292 list_for_each(i, &dev->obj_bucket[bucket].list) {
1293 /* If there is already one in the list */
1294 if (i && list_entry(i, struct yaffs_obj,
1295 hash_link)->obj_id == n) {
1305 static void yaffs_hash_obj(struct yaffs_obj *in)
1307 int bucket = yaffs_hash_fn(in->obj_id);
1308 struct yaffs_dev *dev = in->my_dev;
1310 list_add(&in->hash_link, &dev->obj_bucket[bucket].list);
1311 dev->obj_bucket[bucket].count++;
1314 struct yaffs_obj *yaffs_find_by_number(struct yaffs_dev *dev, u32 number)
1316 int bucket = yaffs_hash_fn(number);
1317 struct list_head *i;
1318 struct yaffs_obj *in;
1320 list_for_each(i, &dev->obj_bucket[bucket].list) {
1321 /* Look if it is in the list */
1323 in = list_entry(i, struct yaffs_obj, hash_link);
1324 if (in->obj_id == number) {
1326 /* Don't tell the VFS about this one if it is defered free */
1327 if (in->defered_free)
1338 struct yaffs_obj *yaffs_new_obj(struct yaffs_dev *dev, int number,
1339 enum yaffs_obj_type type)
1341 struct yaffs_obj *the_obj = NULL;
1342 struct yaffs_tnode *tn = NULL;
1345 number = yaffs_new_obj_id(dev);
1347 if (type == YAFFS_OBJECT_TYPE_FILE) {
1348 tn = yaffs_get_tnode(dev);
1353 the_obj = yaffs_alloc_empty_obj(dev);
1356 yaffs_free_tnode(dev, tn);
1362 the_obj->rename_allowed = 1;
1363 the_obj->unlink_allowed = 1;
1364 the_obj->obj_id = number;
1365 yaffs_hash_obj(the_obj);
1366 the_obj->variant_type = type;
1367 yaffs_load_current_time(the_obj, 1, 1);
1370 case YAFFS_OBJECT_TYPE_FILE:
1371 the_obj->variant.file_variant.file_size = 0;
1372 the_obj->variant.file_variant.scanned_size = 0;
1373 the_obj->variant.file_variant.shrink_size = ~0; /* max */
1374 the_obj->variant.file_variant.top_level = 0;
1375 the_obj->variant.file_variant.top = tn;
1377 case YAFFS_OBJECT_TYPE_DIRECTORY:
1378 INIT_LIST_HEAD(&the_obj->variant.dir_variant.children);
1379 INIT_LIST_HEAD(&the_obj->variant.dir_variant.dirty);
1381 case YAFFS_OBJECT_TYPE_SYMLINK:
1382 case YAFFS_OBJECT_TYPE_HARDLINK:
1383 case YAFFS_OBJECT_TYPE_SPECIAL:
1384 /* No action required */
1386 case YAFFS_OBJECT_TYPE_UNKNOWN:
1387 /* todo this should not happen */
1395 struct yaffs_obj *yaffs_find_or_create_by_number(struct yaffs_dev *dev,
1397 enum yaffs_obj_type type)
1399 struct yaffs_obj *the_obj = NULL;
1402 the_obj = yaffs_find_by_number(dev, number);
1405 the_obj = yaffs_new_obj(dev, number, type);
1411 YCHAR *yaffs_clone_str(const YCHAR * str)
1413 YCHAR *new_str = NULL;
1419 len = yaffs_strnlen(str, YAFFS_MAX_ALIAS_LENGTH);
1420 new_str = YMALLOC((len + 1) * sizeof(YCHAR));
1422 yaffs_strncpy(new_str, str, len);
1430 * Mknod (create) a new object.
1431 * equiv_obj only has meaning for a hard link;
1432 * alias_str only has meaning for a symlink.
1433 * rdev only has meaning for devices (a subset of special objects)
1436 static struct yaffs_obj *yaffs_create_obj(enum yaffs_obj_type type,
1437 struct yaffs_obj *parent,
1442 struct yaffs_obj *equiv_obj,
1443 const YCHAR * alias_str, u32 rdev)
1445 struct yaffs_obj *in;
1448 struct yaffs_dev *dev = parent->my_dev;
1450 /* Check if the entry exists. If it does then fail the call since we don't want a dup. */
1451 if (yaffs_find_by_name(parent, name))
1454 if (type == YAFFS_OBJECT_TYPE_SYMLINK) {
1455 str = yaffs_clone_str(alias_str);
1460 in = yaffs_new_obj(dev, -1, type);
1471 in->variant_type = type;
1473 in->yst_mode = mode;
1475 yaffs_attribs_init(in, gid, uid, rdev);
1477 in->n_data_chunks = 0;
1479 yaffs_set_obj_name(in, name);
1482 yaffs_add_obj_to_dir(parent, in);
1484 in->my_dev = parent->my_dev;
1487 case YAFFS_OBJECT_TYPE_SYMLINK:
1488 in->variant.symlink_variant.alias = str;
1490 case YAFFS_OBJECT_TYPE_HARDLINK:
1491 in->variant.hardlink_variant.equiv_obj = equiv_obj;
1492 in->variant.hardlink_variant.equiv_id =
1494 list_add(&in->hard_links, &equiv_obj->hard_links);
1496 case YAFFS_OBJECT_TYPE_FILE:
1497 case YAFFS_OBJECT_TYPE_DIRECTORY:
1498 case YAFFS_OBJECT_TYPE_SPECIAL:
1499 case YAFFS_OBJECT_TYPE_UNKNOWN:
1504 if (yaffs_update_oh(in, name, 0, 0, 0, NULL) < 0) {
1505 /* Could not create the object header, fail the creation */
1510 yaffs_update_parent(parent);
1516 struct yaffs_obj *yaffs_create_file(struct yaffs_obj *parent,
1517 const YCHAR * name, u32 mode, u32 uid,
1520 return yaffs_create_obj(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
1521 uid, gid, NULL, NULL, 0);
1524 struct yaffs_obj *yaffs_create_dir(struct yaffs_obj *parent, const YCHAR * name,
1525 u32 mode, u32 uid, u32 gid)
1527 return yaffs_create_obj(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
1528 mode, uid, gid, NULL, NULL, 0);
1531 struct yaffs_obj *yaffs_create_special(struct yaffs_obj *parent,
1532 const YCHAR * name, u32 mode, u32 uid,
1535 return yaffs_create_obj(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
1536 uid, gid, NULL, NULL, rdev);
1539 struct yaffs_obj *yaffs_create_symlink(struct yaffs_obj *parent,
1540 const YCHAR * name, u32 mode, u32 uid,
1541 u32 gid, const YCHAR * alias)
1543 return yaffs_create_obj(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
1544 uid, gid, NULL, alias, 0);
1547 /* yaffs_link_obj returns the object id of the equivalent object.*/
1548 struct yaffs_obj *yaffs_link_obj(struct yaffs_obj *parent, const YCHAR * name,
1549 struct yaffs_obj *equiv_obj)
1551 /* Get the real object in case we were fed a hard link as an equivalent object */
1552 equiv_obj = yaffs_get_equivalent_obj(equiv_obj);
1554 if (yaffs_create_obj
1555 (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0,
1556 equiv_obj, NULL, 0)) {
1564 static int yaffs_change_obj_name(struct yaffs_obj *obj,
1565 struct yaffs_obj *new_dir,
1566 const YCHAR * new_name, int force, int shadows)
1571 struct yaffs_obj *existing_target;
1573 if (new_dir == NULL)
1574 new_dir = obj->parent; /* use the old directory */
1576 if (new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
1577 T(YAFFS_TRACE_ALWAYS,
1579 ("tragedy: yaffs_change_obj_name: new_dir is not a directory"
1584 /* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */
1585 if (obj->my_dev->param.is_yaffs2)
1586 unlink_op = (new_dir == obj->my_dev->unlinked_dir);
1588 unlink_op = (new_dir == obj->my_dev->unlinked_dir
1589 && obj->variant_type == YAFFS_OBJECT_TYPE_FILE);
1591 del_op = (new_dir == obj->my_dev->del_dir);
1593 existing_target = yaffs_find_by_name(new_dir, new_name);
1595 /* If the object is a file going into the unlinked directory,
1596 * then it is OK to just stuff it in since duplicate names are allowed.
1597 * else only proceed if the new name does not exist and if we're putting
1598 * it into a directory.
1604 !existing_target) &&
1605 new_dir->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) {
1606 yaffs_set_obj_name(obj, new_name);
1609 yaffs_add_obj_to_dir(new_dir, obj);
1614 /* If it is a deletion then we mark it as a shrink for gc purposes. */
1615 if (yaffs_update_oh(obj, new_name, 0, del_op, shadows, NULL) >=
1623 int yaffs_rename_obj(struct yaffs_obj *old_dir, const YCHAR * old_name,
1624 struct yaffs_obj *new_dir, const YCHAR * new_name)
1626 struct yaffs_obj *obj = NULL;
1627 struct yaffs_obj *existing_target = NULL;
1630 struct yaffs_dev *dev;
1632 if (!old_dir || old_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
1634 if (!new_dir || new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
1637 dev = old_dir->my_dev;
1639 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
1640 /* Special case for case insemsitive systems.
1641 * While look-up is case insensitive, the name isn't.
1642 * Therefore we might want to change x.txt to X.txt
1644 if (old_dir == new_dir && yaffs_strcmp(old_name, new_name) == 0)
1648 if (yaffs_strnlen(new_name, YAFFS_MAX_NAME_LENGTH + 1) >
1649 YAFFS_MAX_NAME_LENGTH)
1653 obj = yaffs_find_by_name(old_dir, old_name);
1655 if (obj && obj->rename_allowed) {
1657 /* Now do the handling for an existing target, if there is one */
1659 existing_target = yaffs_find_by_name(new_dir, new_name);
1660 if (existing_target &&
1661 existing_target->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY
1662 && !list_empty(&existing_target->variant.dir_variant.
1664 /* There is a target that is a non-empty directory, so we fail */
1665 return YAFFS_FAIL; /* EEXIST or ENOTEMPTY */
1666 } else if (existing_target && existing_target != obj) {
1667 /* Nuke the target first, using shadowing,
1668 * but only if it isn't the same object.
1670 * Note we must disable gc otherwise it can mess up the shadowing.
1673 dev->gc_disable = 1;
1674 yaffs_change_obj_name(obj, new_dir, new_name, force,
1675 existing_target->obj_id);
1676 existing_target->is_shadowed = 1;
1677 yaffs_unlink_obj(existing_target);
1678 dev->gc_disable = 0;
1681 result = yaffs_change_obj_name(obj, new_dir, new_name, 1, 0);
1683 yaffs_update_parent(old_dir);
1684 if (new_dir != old_dir)
1685 yaffs_update_parent(new_dir);
1692 /*------------------------- Block Management and Page Allocation ----------------*/
1694 static int yaffs_init_blocks(struct yaffs_dev *dev)
1696 int n_blocks = dev->internal_end_block - dev->internal_start_block + 1;
1698 dev->block_info = NULL;
1699 dev->chunk_bits = NULL;
1701 dev->alloc_block = -1; /* force it to get a new one */
1703 /* If the first allocation strategy fails, thry the alternate one */
1704 dev->block_info = YMALLOC(n_blocks * sizeof(struct yaffs_block_info));
1705 if (!dev->block_info) {
1707 YMALLOC_ALT(n_blocks * sizeof(struct yaffs_block_info));
1708 dev->block_info_alt = 1;
1710 dev->block_info_alt = 0;
1713 if (dev->block_info) {
1714 /* Set up dynamic blockinfo stuff. */
1715 dev->chunk_bit_stride = (dev->param.chunks_per_block + 7) / 8; /* round up bytes */
1716 dev->chunk_bits = YMALLOC(dev->chunk_bit_stride * n_blocks);
1717 if (!dev->chunk_bits) {
1719 YMALLOC_ALT(dev->chunk_bit_stride * n_blocks);
1720 dev->chunk_bits_alt = 1;
1722 dev->chunk_bits_alt = 0;
1726 if (dev->block_info && dev->chunk_bits) {
1727 memset(dev->block_info, 0,
1728 n_blocks * sizeof(struct yaffs_block_info));
1729 memset(dev->chunk_bits, 0, dev->chunk_bit_stride * n_blocks);
1736 static void yaffs_deinit_blocks(struct yaffs_dev *dev)
1738 if (dev->block_info_alt && dev->block_info)
1739 YFREE_ALT(dev->block_info);
1740 else if (dev->block_info)
1741 YFREE(dev->block_info);
1743 dev->block_info_alt = 0;
1745 dev->block_info = NULL;
1747 if (dev->chunk_bits_alt && dev->chunk_bits)
1748 YFREE_ALT(dev->chunk_bits);
1749 else if (dev->chunk_bits)
1750 YFREE(dev->chunk_bits);
1751 dev->chunk_bits_alt = 0;
1752 dev->chunk_bits = NULL;
1755 void yaffs_block_became_dirty(struct yaffs_dev *dev, int block_no)
1757 struct yaffs_block_info *bi = yaffs_get_block_info(dev, block_no);
1761 /* If the block is still healthy erase it and mark as clean.
1762 * If the block has had a data failure, then retire it.
1765 T(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
1766 (TSTR("yaffs_block_became_dirty block %d state %d %s" TENDSTR),
1767 block_no, bi->block_state,
1768 (bi->needs_retiring) ? "needs retiring" : ""));
1770 yaffs2_clear_oldest_dirty_seq(dev, bi);
1772 bi->block_state = YAFFS_BLOCK_STATE_DIRTY;
1774 /* If this is the block being garbage collected then stop gc'ing this block */
1775 if (block_no == dev->gc_block)
1778 /* If this block is currently the best candidate for gc then drop as a candidate */
1779 if (block_no == dev->gc_dirtiest) {
1780 dev->gc_dirtiest = 0;
1781 dev->gc_pages_in_use = 0;
1784 if (!bi->needs_retiring) {
1785 yaffs2_checkpt_invalidate(dev);
1786 erased_ok = yaffs_erase_block(dev, block_no);
1788 dev->n_erase_failures++;
1789 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
1790 (TSTR("**>> Erasure failed %d" TENDSTR), block_no));
1795 ((yaffs_trace_mask & YAFFS_TRACE_ERASE)
1796 || !yaffs_skip_verification(dev))) {
1798 for (i = 0; i < dev->param.chunks_per_block; i++) {
1799 if (!yaffs_check_chunk_erased
1800 (dev, block_no * dev->param.chunks_per_block + i)) {
1801 T(YAFFS_TRACE_ERROR,
1803 (">>Block %d erasure supposedly OK, but chunk %d not erased"
1804 TENDSTR), block_no, i));
1810 /* Clean it up... */
1811 bi->block_state = YAFFS_BLOCK_STATE_EMPTY;
1813 dev->n_erased_blocks++;
1814 bi->pages_in_use = 0;
1815 bi->soft_del_pages = 0;
1816 bi->has_shrink_hdr = 0;
1817 bi->skip_erased_check = 1; /* This is clean, so no need to check */
1818 bi->gc_prioritise = 0;
1819 yaffs_clear_chunk_bits(dev, block_no);
1821 T(YAFFS_TRACE_ERASE,
1822 (TSTR("Erased block %d" TENDSTR), block_no));
1824 dev->n_free_chunks -= dev->param.chunks_per_block; /* We lost a block of free space */
1826 yaffs_retire_block(dev, block_no);
1827 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
1828 (TSTR("**>> Block %d retired" TENDSTR), block_no));
1832 static int yaffs_find_alloc_block(struct yaffs_dev *dev)
1836 struct yaffs_block_info *bi;
1838 if (dev->n_erased_blocks < 1) {
1839 /* Hoosterman we've got a problem.
1840 * Can't get space to gc
1842 T(YAFFS_TRACE_ERROR,
1843 (TSTR("yaffs tragedy: no more erased blocks" TENDSTR)));
1848 /* Find an empty block. */
1850 for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
1851 dev->alloc_block_finder++;
1852 if (dev->alloc_block_finder < dev->internal_start_block
1853 || dev->alloc_block_finder > dev->internal_end_block) {
1854 dev->alloc_block_finder = dev->internal_start_block;
1857 bi = yaffs_get_block_info(dev, dev->alloc_block_finder);
1859 if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) {
1860 bi->block_state = YAFFS_BLOCK_STATE_ALLOCATING;
1862 bi->seq_number = dev->seq_number;
1863 dev->n_erased_blocks--;
1864 T(YAFFS_TRACE_ALLOCATE,
1865 (TSTR("Allocated block %d, seq %d, %d left" TENDSTR),
1866 dev->alloc_block_finder, dev->seq_number,
1867 dev->n_erased_blocks));
1868 return dev->alloc_block_finder;
1872 T(YAFFS_TRACE_ALWAYS,
1874 ("yaffs tragedy: no more erased blocks, but there should have been %d"
1875 TENDSTR), dev->n_erased_blocks));
1881 * Check if there's space to allocate...
1882 * Thinks.... do we need top make this ths same as yaffs_get_free_chunks()?
1884 int yaffs_check_alloc_available(struct yaffs_dev *dev, int n_chunks)
1886 int reserved_chunks;
1887 int reserved_blocks = dev->param.n_reserved_blocks;
1890 checkpt_blocks = yaffs_calc_checkpt_blocks_required(dev);
1893 ((reserved_blocks + checkpt_blocks) * dev->param.chunks_per_block);
1895 return (dev->n_free_chunks > (reserved_chunks + n_chunks));
1898 static int yaffs_alloc_chunk(struct yaffs_dev *dev, int use_reserver,
1899 struct yaffs_block_info **block_ptr)
1902 struct yaffs_block_info *bi;
1904 if (dev->alloc_block < 0) {
1905 /* Get next block to allocate off */
1906 dev->alloc_block = yaffs_find_alloc_block(dev);
1907 dev->alloc_page = 0;
1910 if (!use_reserver && !yaffs_check_alloc_available(dev, 1)) {
1911 /* Not enough space to allocate unless we're allowed to use the reserve. */
1915 if (dev->n_erased_blocks < dev->param.n_reserved_blocks
1916 && dev->alloc_page == 0) {
1917 T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR)));
1920 /* Next page please.... */
1921 if (dev->alloc_block >= 0) {
1922 bi = yaffs_get_block_info(dev, dev->alloc_block);
1924 ret_val = (dev->alloc_block * dev->param.chunks_per_block) +
1927 yaffs_set_chunk_bit(dev, dev->alloc_block, dev->alloc_page);
1931 dev->n_free_chunks--;
1933 /* If the block is full set the state to full */
1934 if (dev->alloc_page >= dev->param.chunks_per_block) {
1935 bi->block_state = YAFFS_BLOCK_STATE_FULL;
1936 dev->alloc_block = -1;
1945 T(YAFFS_TRACE_ERROR,
1946 (TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
1951 static int yaffs_get_erased_chunks(struct yaffs_dev *dev)
1955 n = dev->n_erased_blocks * dev->param.chunks_per_block;
1957 if (dev->alloc_block > 0)
1958 n += (dev->param.chunks_per_block - dev->alloc_page);
1965 * yaffs_skip_rest_of_block() skips over the rest of the allocation block
1966 * if we don't want to write to it.
1968 void yaffs_skip_rest_of_block(struct yaffs_dev *dev)
1970 if (dev->alloc_block > 0) {
1971 struct yaffs_block_info *bi =
1972 yaffs_get_block_info(dev, dev->alloc_block);
1973 if (bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING) {
1974 bi->block_state = YAFFS_BLOCK_STATE_FULL;
1975 dev->alloc_block = -1;
1980 static int yaffs_gc_block(struct yaffs_dev *dev, int block, int whole_block)
1985 int ret_val = YAFFS_OK;
1987 int is_checkpt_block;
1991 int chunks_before = yaffs_get_erased_chunks(dev);
1994 struct yaffs_ext_tags tags;
1996 struct yaffs_block_info *bi = yaffs_get_block_info(dev, block);
1998 struct yaffs_obj *object;
2000 is_checkpt_block = (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT);
2002 T(YAFFS_TRACE_TRACING,
2004 ("Collecting block %d, in use %d, shrink %d, whole_block %d"
2005 TENDSTR), block, bi->pages_in_use, bi->has_shrink_hdr,
2008 /*yaffs_verify_free_chunks(dev); */
2010 if (bi->block_state == YAFFS_BLOCK_STATE_FULL)
2011 bi->block_state = YAFFS_BLOCK_STATE_COLLECTING;
2013 bi->has_shrink_hdr = 0; /* clear the flag so that the block can erase */
2015 dev->gc_disable = 1;
2017 if (is_checkpt_block || !yaffs_still_some_chunks(dev, block)) {
2018 T(YAFFS_TRACE_TRACING,
2020 ("Collecting block %d that has no chunks in use" TENDSTR),
2022 yaffs_block_became_dirty(dev, block);
2025 u8 *buffer = yaffs_get_temp_buffer(dev, __LINE__);
2027 yaffs_verify_blk(dev, bi, block);
2029 max_copies = (whole_block) ? dev->param.chunks_per_block : 5;
2030 old_chunk = block * dev->param.chunks_per_block + dev->gc_chunk;
2032 for ( /* init already done */ ;
2033 ret_val == YAFFS_OK &&
2034 dev->gc_chunk < dev->param.chunks_per_block &&
2035 (bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) &&
2036 max_copies > 0; dev->gc_chunk++, old_chunk++) {
2037 if (yaffs_check_chunk_bit(dev, block, dev->gc_chunk)) {
2039 /* This page is in use and might need to be copied off */
2045 yaffs_init_tags(&tags);
2047 yaffs_rd_chunk_tags_nand(dev, old_chunk,
2050 object = yaffs_find_by_number(dev, tags.obj_id);
2052 T(YAFFS_TRACE_GC_DETAIL,
2054 ("Collecting chunk in block %d, %d %d %d "
2055 TENDSTR), dev->gc_chunk, tags.obj_id,
2056 tags.chunk_id, tags.n_bytes));
2058 if (object && !yaffs_skip_verification(dev)) {
2059 if (tags.chunk_id == 0)
2062 else if (object->soft_del)
2063 matching_chunk = old_chunk; /* Defeat the test */
2066 yaffs_find_chunk_in_file
2067 (object, tags.chunk_id,
2070 if (old_chunk != matching_chunk)
2071 T(YAFFS_TRACE_ERROR,
2073 ("gc: page in gc mismatch: %d %d %d %d"
2074 TENDSTR), old_chunk,
2075 matching_chunk, tags.obj_id,
2081 T(YAFFS_TRACE_ERROR,
2083 ("page %d in gc has no object: %d %d %d "
2084 TENDSTR), old_chunk,
2085 tags.obj_id, tags.chunk_id,
2091 object->soft_del && tags.chunk_id != 0) {
2092 /* Data chunk in a soft deleted file, throw it away
2093 * It's a soft deleted data chunk,
2094 * No need to copy this, just forget about it and
2095 * fix up the object.
2098 /* Free chunks already includes softdeleted chunks.
2099 * How ever this chunk is going to soon be really deleted
2100 * which will increment free chunks.
2101 * We have to decrement free chunks so this works out properly.
2103 dev->n_free_chunks--;
2104 bi->soft_del_pages--;
2106 object->n_data_chunks--;
2108 if (object->n_data_chunks <= 0) {
2109 /* remeber to clean up the object */
2110 dev->gc_cleanup_list[dev->
2117 /* Todo object && object->deleted && object->n_data_chunks == 0 */
2118 /* Deleted object header with no data chunks.
2119 * Can be discarded and the file deleted.
2121 object->hdr_chunk = 0;
2122 yaffs_free_tnode(object->my_dev,
2124 variant.file_variant.
2126 object->variant.file_variant.top = NULL;
2127 yaffs_generic_obj_del(object);
2129 } else if (object) {
2130 /* It's either a data chunk in a live file or
2131 * an ObjectHeader, so we're interested in it.
2132 * NB Need to keep the ObjectHeaders of deleted files
2133 * until the whole file has been deleted off
2135 tags.serial_number++;
2139 if (tags.chunk_id == 0) {
2140 /* It is an object Id,
2141 * We need to nuke the shrinkheader flags first
2142 * Also need to clean up shadowing.
2143 * We no longer want the shrink_header flag since its work is done
2144 * and if it is left in place it will mess up scanning.
2147 struct yaffs_obj_hdr *oh;
2148 oh = (struct yaffs_obj_hdr *)
2152 tags.extra_is_shrink = 0;
2154 oh->shadows_obj = 0;
2155 oh->inband_shadowed_obj_id = 0;
2156 tags.extra_shadows = 0;
2158 /* Update file size */
2159 if (object->variant_type ==
2160 YAFFS_OBJECT_TYPE_FILE) {
2169 yaffs_verify_oh(object, oh,
2172 yaffs_write_new_chunk(dev,
2179 yaffs_write_new_chunk(dev,
2185 if (new_chunk < 0) {
2186 ret_val = YAFFS_FAIL;
2189 /* Ok, now fix up the Tnodes etc. */
2191 if (tags.chunk_id == 0) {
2198 /* It's a data chunk */
2200 ok = yaffs_put_chunk_in_file(object, tags.chunk_id, new_chunk, 0);
2205 if (ret_val == YAFFS_OK)
2206 yaffs_chunk_del(dev, old_chunk,
2207 mark_flash, __LINE__);
2212 yaffs_release_temp_buffer(dev, buffer, __LINE__);
2216 yaffs_verify_collected_blk(dev, bi, block);
2218 if (bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) {
2220 * The gc did not complete. Set block state back to FULL
2221 * because checkpointing does not restore gc.
2223 bi->block_state = YAFFS_BLOCK_STATE_FULL;
2225 /* The gc completed. */
2226 /* Do any required cleanups */
2227 for (i = 0; i < dev->n_clean_ups; i++) {
2228 /* Time to delete the file too */
2230 yaffs_find_by_number(dev, dev->gc_cleanup_list[i]);
2232 yaffs_free_tnode(dev,
2235 object->variant.file_variant.top = NULL;
2238 ("yaffs: About to finally delete object %d"
2239 TENDSTR), object->obj_id));
2240 yaffs_generic_obj_del(object);
2241 object->my_dev->n_deleted_files--;
2246 chunks_after = yaffs_get_erased_chunks(dev);
2247 if (chunks_before >= chunks_after) {
2250 ("gc did not increase free chunks before %d after %d"
2251 TENDSTR), chunks_before, chunks_after));
2255 dev->n_clean_ups = 0;
2258 dev->gc_disable = 0;
2264 * FindBlockForgarbageCollection is used to select the dirtiest block (or close enough)
2265 * for garbage collection.
2268 static unsigned yaffs_find_gc_block(struct yaffs_dev *dev,
2269 int aggressive, int background)
2273 unsigned selected = 0;
2274 int prioritised = 0;
2275 int prioritised_exist = 0;
2276 struct yaffs_block_info *bi;
2279 /* First let's see if we need to grab a prioritised block */
2280 if (dev->has_pending_prioritised_gc && !aggressive) {
2281 dev->gc_dirtiest = 0;
2282 bi = dev->block_info;
2283 for (i = dev->internal_start_block;
2284 i <= dev->internal_end_block && !selected; i++) {
2286 if (bi->gc_prioritise) {
2287 prioritised_exist = 1;
2288 if (bi->block_state == YAFFS_BLOCK_STATE_FULL &&
2289 yaffs_block_ok_for_gc(dev, bi)) {
2298 * If there is a prioritised block and none was selected then
2299 * this happened because there is at least one old dirty block gumming
2300 * up the works. Let's gc the oldest dirty block.
2303 if (prioritised_exist &&
2304 !selected && dev->oldest_dirty_block > 0)
2305 selected = dev->oldest_dirty_block;
2307 if (!prioritised_exist) /* None found, so we can clear this */
2308 dev->has_pending_prioritised_gc = 0;
2311 /* If we're doing aggressive GC then we are happy to take a less-dirty block, and
2313 * else (we're doing a leasurely gc), then we only bother to do this if the
2314 * block has only a few pages in use.
2320 dev->internal_end_block - dev->internal_start_block + 1;
2322 threshold = dev->param.chunks_per_block;
2323 iterations = n_blocks;
2328 max_threshold = dev->param.chunks_per_block / 2;
2330 max_threshold = dev->param.chunks_per_block / 8;
2332 if (max_threshold < YAFFS_GC_PASSIVE_THRESHOLD)
2333 max_threshold = YAFFS_GC_PASSIVE_THRESHOLD;
2335 threshold = background ? (dev->gc_not_done + 2) * 2 : 0;
2336 if (threshold < YAFFS_GC_PASSIVE_THRESHOLD)
2337 threshold = YAFFS_GC_PASSIVE_THRESHOLD;
2338 if (threshold > max_threshold)
2339 threshold = max_threshold;
2341 iterations = n_blocks / 16 + 1;
2342 if (iterations > 100)
2348 (dev->gc_dirtiest < 1 ||
2349 dev->gc_pages_in_use > YAFFS_GC_GOOD_ENOUGH); i++) {
2350 dev->gc_block_finder++;
2351 if (dev->gc_block_finder < dev->internal_start_block ||
2352 dev->gc_block_finder > dev->internal_end_block)
2353 dev->gc_block_finder =
2354 dev->internal_start_block;
2356 bi = yaffs_get_block_info(dev, dev->gc_block_finder);
2358 pages_used = bi->pages_in_use - bi->soft_del_pages;
2360 if (bi->block_state == YAFFS_BLOCK_STATE_FULL &&
2361 pages_used < dev->param.chunks_per_block &&
2362 (dev->gc_dirtiest < 1
2363 || pages_used < dev->gc_pages_in_use)
2364 && yaffs_block_ok_for_gc(dev, bi)) {
2365 dev->gc_dirtiest = dev->gc_block_finder;
2366 dev->gc_pages_in_use = pages_used;
2370 if (dev->gc_dirtiest > 0 && dev->gc_pages_in_use <= threshold)
2371 selected = dev->gc_dirtiest;
2375 * If nothing has been selected for a while, try selecting the oldest dirty
2376 * because that's gumming up the works.
2379 if (!selected && dev->param.is_yaffs2 &&
2380 dev->gc_not_done >= (background ? 10 : 20)) {
2381 yaffs2_find_oldest_dirty_seq(dev);
2382 if (dev->oldest_dirty_block > 0) {
2383 selected = dev->oldest_dirty_block;
2384 dev->gc_dirtiest = selected;
2385 dev->oldest_dirty_gc_count++;
2386 bi = yaffs_get_block_info(dev, selected);
2387 dev->gc_pages_in_use =
2388 bi->pages_in_use - bi->soft_del_pages;
2390 dev->gc_not_done = 0;
2397 ("GC Selected block %d with %d free, prioritised:%d"
2399 dev->param.chunks_per_block - dev->gc_pages_in_use,
2406 dev->gc_dirtiest = 0;
2407 dev->gc_pages_in_use = 0;
2408 dev->gc_not_done = 0;
2409 if (dev->refresh_skip > 0)
2410 dev->refresh_skip--;
2415 ("GC none: finder %d skip %d threshold %d dirtiest %d using %d oldest %d%s"
2416 TENDSTR), dev->gc_block_finder, dev->gc_not_done, threshold,
2417 dev->gc_dirtiest, dev->gc_pages_in_use,
2418 dev->oldest_dirty_block, background ? " bg" : ""));
2424 /* New garbage collector
2425 * If we're very low on erased blocks then we do aggressive garbage collection
2426 * otherwise we do "leasurely" garbage collection.
2427 * Aggressive gc looks further (whole array) and will accept less dirty blocks.
2428 * Passive gc only inspects smaller areas and will only accept more dirty blocks.
2430 * The idea is to help clear out space in a more spread-out manner.
2431 * Dunno if it really does anything useful.
2433 static int yaffs_check_gc(struct yaffs_dev *dev, int background)
2436 int gc_ok = YAFFS_OK;
2440 int checkpt_block_adjust;
2442 if (dev->param.gc_control && (dev->param.gc_control(dev) & 1) == 0)
2445 if (dev->gc_disable) {
2446 /* Bail out so we don't get recursive gc */
2450 /* This loop should pass the first time.
2451 * We'll only see looping here if the collection does not increase space.
2457 checkpt_block_adjust = yaffs_calc_checkpt_blocks_required(dev);
2460 dev->param.n_reserved_blocks + checkpt_block_adjust + 1;
2462 dev->n_erased_blocks * dev->param.chunks_per_block;
2464 /* If we need a block soon then do aggressive gc. */
2465 if (dev->n_erased_blocks < min_erased)
2469 && erased_chunks > (dev->n_free_chunks / 4))
2472 if (dev->gc_skip > 20)
2474 if (erased_chunks < dev->n_free_chunks / 2 ||
2475 dev->gc_skip < 1 || background)
2485 /* If we don't already have a block being gc'd then see if we should start another */
2487 if (dev->gc_block < 1 && !aggressive) {
2488 dev->gc_block = yaffs2_find_refresh_block(dev);
2490 dev->n_clean_ups = 0;
2492 if (dev->gc_block < 1) {
2494 yaffs_find_gc_block(dev, aggressive, background);
2496 dev->n_clean_ups = 0;
2499 if (dev->gc_block > 0) {
2502 dev->passive_gc_count++;
2506 ("yaffs: GC n_erased_blocks %d aggressive %d"
2507 TENDSTR), dev->n_erased_blocks, aggressive));
2509 gc_ok = yaffs_gc_block(dev, dev->gc_block, aggressive);
2512 if (dev->n_erased_blocks < (dev->param.n_reserved_blocks)
2513 && dev->gc_block > 0) {
2516 ("yaffs: GC !!!no reclaim!!! n_erased_blocks %d after try %d block %d"
2517 TENDSTR), dev->n_erased_blocks, max_tries,
2520 } while ((dev->n_erased_blocks < dev->param.n_reserved_blocks) &&
2521 (dev->gc_block > 0) && (max_tries < 2));
2523 return aggressive ? gc_ok : YAFFS_OK;
2528 * Garbage collects. Intended to be called from a background thread.
2529 * Returns non-zero if at least half the free chunks are erased.
2531 int yaffs_bg_gc(struct yaffs_dev *dev, unsigned urgency)
2533 int erased_chunks = dev->n_erased_blocks * dev->param.chunks_per_block;
2535 T(YAFFS_TRACE_BACKGROUND, (TSTR("Background gc %u" TENDSTR), urgency));
2537 yaffs_check_gc(dev, 1);
2538 return erased_chunks > dev->n_free_chunks / 2;
2541 /*------------------------- TAGS --------------------------------*/
2543 static int yaffs_tags_match(const struct yaffs_ext_tags *tags, int obj_id,
2546 return (tags->chunk_id == chunk_obj &&
2547 tags->obj_id == obj_id && !tags->is_deleted) ? 1 : 0;
2551 /*-------------------- Data file manipulation -----------------*/
2553 static int yaffs_find_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
2554 struct yaffs_ext_tags *tags)
2556 /*Get the Tnode, then get the level 0 offset chunk offset */
2557 struct yaffs_tnode *tn;
2559 struct yaffs_ext_tags local_tags;
2562 struct yaffs_dev *dev = in->my_dev;
2565 /* Passed a NULL, so use our own tags space */
2569 tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk);
2572 the_chunk = yaffs_get_group_base(dev, tn, inode_chunk);
2575 yaffs_find_chunk_in_group(dev, the_chunk, tags, in->obj_id,
2581 static int yaffs_find_del_file_chunk(struct yaffs_obj *in, int inode_chunk,
2582 struct yaffs_ext_tags *tags)
2584 /* Get the Tnode, then get the level 0 offset chunk offset */
2585 struct yaffs_tnode *tn;
2587 struct yaffs_ext_tags local_tags;
2589 struct yaffs_dev *dev = in->my_dev;
2593 /* Passed a NULL, so use our own tags space */
2597 tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk);
2601 the_chunk = yaffs_get_group_base(dev, tn, inode_chunk);
2604 yaffs_find_chunk_in_group(dev, the_chunk, tags, in->obj_id,
2607 /* Delete the entry in the filestructure (if found) */
2609 yaffs_load_tnode_0(dev, tn, inode_chunk, 0);
2615 int yaffs_put_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
2616 int nand_chunk, int in_scan)
2618 /* NB in_scan is zero unless scanning.
2619 * For forward scanning, in_scan is > 0;
2620 * for backward scanning in_scan is < 0
2622 * nand_chunk = 0 is a dummy insert to make sure the tnodes are there.
2625 struct yaffs_tnode *tn;
2626 struct yaffs_dev *dev = in->my_dev;
2628 struct yaffs_ext_tags existing_tags;
2629 struct yaffs_ext_tags new_tags;
2630 unsigned existing_serial, new_serial;
2632 if (in->variant_type != YAFFS_OBJECT_TYPE_FILE) {
2633 /* Just ignore an attempt at putting a chunk into a non-file during scanning
2634 * If it is not during Scanning then something went wrong!
2637 T(YAFFS_TRACE_ERROR,
2639 ("yaffs tragedy:attempt to put data chunk into a non-file"
2644 yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
2648 tn = yaffs_add_find_tnode_0(dev,
2649 &in->variant.file_variant,
2655 /* Dummy insert, bail now */
2658 existing_cunk = yaffs_get_group_base(dev, tn, inode_chunk);
2661 /* If we're scanning then we need to test for duplicates
2662 * NB This does not need to be efficient since it should only ever
2663 * happen when the power fails during a write, then only one
2664 * chunk should ever be affected.
2666 * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO
2667 * Update: For backward scanning we don't need to re-read tags so this is quite cheap.
2670 if (existing_cunk > 0) {
2671 /* NB Right now existing chunk will not be real chunk_id if the chunk group size > 1
2672 * thus we have to do a FindChunkInFile to get the real chunk id.
2674 * We have a duplicate now we need to decide which one to use:
2676 * Backwards scanning YAFFS2: The old one is what we use, dump the new one.
2677 * Forward scanning YAFFS2: The new one is what we use, dump the old one.
2678 * YAFFS1: Get both sets of tags and compare serial numbers.
2682 /* Only do this for forward scanning */
2683 yaffs_rd_chunk_tags_nand(dev,
2687 /* Do a proper find */
2689 yaffs_find_chunk_in_file(in, inode_chunk,
2693 if (existing_cunk <= 0) {
2694 /*Hoosterman - how did this happen? */
2696 T(YAFFS_TRACE_ERROR,
2698 ("yaffs tragedy: existing chunk < 0 in scan"
2703 /* NB The deleted flags should be false, otherwise the chunks will
2704 * not be loaded during a scan
2708 new_serial = new_tags.serial_number;
2709 existing_serial = existing_tags.serial_number;
2712 if ((in_scan > 0) &&
2713 (existing_cunk <= 0 ||
2714 ((existing_serial + 1) & 3) == new_serial)) {
2715 /* Forward scanning.
2717 * Delete the old one and drop through to update the tnode
2719 yaffs_chunk_del(dev, existing_cunk, 1,
2722 /* Backward scanning or we want to use the existing one
2724 * Delete the new one and return early so that the tnode isn't changed
2726 yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
2733 if (existing_cunk == 0)
2734 in->n_data_chunks++;
2736 yaffs_load_tnode_0(dev, tn, inode_chunk, nand_chunk);
2741 static int yaffs_rd_data_obj(struct yaffs_obj *in, int inode_chunk, u8 * buffer)
2743 int nand_chunk = yaffs_find_chunk_in_file(in, inode_chunk, NULL);
2745 if (nand_chunk >= 0)
2746 return yaffs_rd_chunk_tags_nand(in->my_dev, nand_chunk,
2749 T(YAFFS_TRACE_NANDACCESS,
2750 (TSTR("Chunk %d not found zero instead" TENDSTR),
2752 /* get sane (zero) data if you read a hole */
2753 memset(buffer, 0, in->my_dev->data_bytes_per_chunk);
2759 void yaffs_chunk_del(struct yaffs_dev *dev, int chunk_id, int mark_flash,
2764 struct yaffs_ext_tags tags;
2765 struct yaffs_block_info *bi;
2771 block = chunk_id / dev->param.chunks_per_block;
2772 page = chunk_id % dev->param.chunks_per_block;
2774 if (!yaffs_check_chunk_bit(dev, block, page))
2775 T(YAFFS_TRACE_VERIFY,
2776 (TSTR("Deleting invalid chunk %d" TENDSTR), chunk_id));
2778 bi = yaffs_get_block_info(dev, block);
2780 yaffs2_update_oldest_dirty_seq(dev, block, bi);
2782 T(YAFFS_TRACE_DELETION,
2783 (TSTR("line %d delete of chunk %d" TENDSTR), lyn, chunk_id));
2785 if (!dev->param.is_yaffs2 && mark_flash &&
2786 bi->block_state != YAFFS_BLOCK_STATE_COLLECTING) {
2788 yaffs_init_tags(&tags);
2790 tags.is_deleted = 1;
2792 yaffs_wr_chunk_tags_nand(dev, chunk_id, NULL, &tags);
2793 yaffs_handle_chunk_update(dev, chunk_id, &tags);
2795 dev->n_unmarked_deletions++;
2798 /* Pull out of the management area.
2799 * If the whole block became dirty, this will kick off an erasure.
2801 if (bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING ||
2802 bi->block_state == YAFFS_BLOCK_STATE_FULL ||
2803 bi->block_state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
2804 bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) {
2805 dev->n_free_chunks++;
2807 yaffs_clear_chunk_bit(dev, block, page);
2811 if (bi->pages_in_use == 0 &&
2812 !bi->has_shrink_hdr &&
2813 bi->block_state != YAFFS_BLOCK_STATE_ALLOCATING &&
2814 bi->block_state != YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
2815 yaffs_block_became_dirty(dev, block);
2822 static int yaffs_wr_data_obj(struct yaffs_obj *in, int inode_chunk,
2823 const u8 * buffer, int n_bytes, int use_reserve)
2825 /* Find old chunk Need to do this to get serial number
2826 * Write new one and patch into tree.
2827 * Invalidate old tags.
2831 struct yaffs_ext_tags prev_tags;
2834 struct yaffs_ext_tags new_tags;
2836 struct yaffs_dev *dev = in->my_dev;
2838 yaffs_check_gc(dev, 0);
2840 /* Get the previous chunk at this location in the file if it exists.
2841 * If it does not exist then put a zero into the tree. This creates
2842 * the tnode now, rather than later when it is harder to clean up.
2844 prev_chunk_id = yaffs_find_chunk_in_file(in, inode_chunk, &prev_tags);
2845 if (prev_chunk_id < 1 &&
2846 !yaffs_put_chunk_in_file(in, inode_chunk, 0, 0))
2849 /* Set up new tags */
2850 yaffs_init_tags(&new_tags);
2852 new_tags.chunk_id = inode_chunk;
2853 new_tags.obj_id = in->obj_id;
2854 new_tags.serial_number =
2855 (prev_chunk_id > 0) ? prev_tags.serial_number + 1 : 1;
2856 new_tags.n_bytes = n_bytes;
2858 if (n_bytes < 1 || n_bytes > dev->param.total_bytes_per_chunk) {
2859 T(YAFFS_TRACE_ERROR,
2860 (TSTR("Writing %d bytes to chunk!!!!!!!!!" TENDSTR),
2866 yaffs_write_new_chunk(dev, buffer, &new_tags, use_reserve);
2868 if (new_chunk_id > 0) {
2869 yaffs_put_chunk_in_file(in, inode_chunk, new_chunk_id, 0);
2871 if (prev_chunk_id > 0)
2872 yaffs_chunk_del(dev, prev_chunk_id, 1, __LINE__);
2874 yaffs_verify_file_sane(in);
2876 return new_chunk_id;
2880 /* UpdateObjectHeader updates the header on NAND for an object.
2881 * If name is not NULL, then that new name is used.
2883 int yaffs_update_oh(struct yaffs_obj *in, const YCHAR * name, int force,
2884 int is_shrink, int shadows, struct yaffs_xattr_mod *xmod)
2887 struct yaffs_block_info *bi;
2889 struct yaffs_dev *dev = in->my_dev;
2896 struct yaffs_ext_tags new_tags;
2897 struct yaffs_ext_tags old_tags;
2898 const YCHAR *alias = NULL;
2901 YCHAR old_name[YAFFS_MAX_NAME_LENGTH + 1];
2903 struct yaffs_obj_hdr *oh = NULL;
2905 yaffs_strcpy(old_name, _Y("silly old name"));
2907 if (!in->fake || in == dev->root_dir || /* The root_dir should also be saved */
2910 yaffs_check_gc(dev, 0);
2911 yaffs_check_obj_details_loaded(in);
2913 buffer = yaffs_get_temp_buffer(in->my_dev, __LINE__);
2914 oh = (struct yaffs_obj_hdr *)buffer;
2916 prev_chunk_id = in->hdr_chunk;
2918 if (prev_chunk_id > 0) {
2919 result = yaffs_rd_chunk_tags_nand(dev, prev_chunk_id,
2922 yaffs_verify_oh(in, oh, &old_tags, 0);
2924 memcpy(old_name, oh->name, sizeof(oh->name));
2925 memset(buffer, 0xFF, sizeof(struct yaffs_obj_hdr));
2927 memset(buffer, 0xFF, dev->data_bytes_per_chunk);
2930 oh->type = in->variant_type;
2931 oh->yst_mode = in->yst_mode;
2932 oh->shadows_obj = oh->inband_shadowed_obj_id = shadows;
2934 yaffs_load_attribs_oh(oh, in);
2937 oh->parent_obj_id = in->parent->obj_id;
2939 oh->parent_obj_id = 0;
2941 if (name && *name) {
2942 memset(oh->name, 0, sizeof(oh->name));
2943 yaffs_load_oh_from_name(dev, oh->name, name);
2944 } else if (prev_chunk_id > 0) {
2945 memcpy(oh->name, old_name, sizeof(oh->name));
2947 memset(oh->name, 0, sizeof(oh->name));
2950 oh->is_shrink = is_shrink;
2952 switch (in->variant_type) {
2953 case YAFFS_OBJECT_TYPE_UNKNOWN:
2954 /* Should not happen */
2956 case YAFFS_OBJECT_TYPE_FILE:
2958 (oh->parent_obj_id == YAFFS_OBJECTID_DELETED
2959 || oh->parent_obj_id ==
2960 YAFFS_OBJECTID_UNLINKED) ? 0 : in->
2961 variant.file_variant.file_size;
2963 case YAFFS_OBJECT_TYPE_HARDLINK:
2964 oh->equiv_id = in->variant.hardlink_variant.equiv_id;
2966 case YAFFS_OBJECT_TYPE_SPECIAL:
2969 case YAFFS_OBJECT_TYPE_DIRECTORY:
2972 case YAFFS_OBJECT_TYPE_SYMLINK:
2973 alias = in->variant.symlink_variant.alias;
2975 alias = _Y("no alias");
2976 yaffs_strncpy(oh->alias, alias, YAFFS_MAX_ALIAS_LENGTH);
2977 oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
2981 /* process any xattrib modifications */
2983 yaffs_apply_xattrib_mod(in, (char *)buffer, xmod);
2986 yaffs_init_tags(&new_tags);
2988 new_tags.chunk_id = 0;
2989 new_tags.obj_id = in->obj_id;
2990 new_tags.serial_number = in->serial;
2992 /* Add extra info for file header */
2994 new_tags.extra_available = 1;
2995 new_tags.extra_parent_id = oh->parent_obj_id;
2996 new_tags.extra_length = oh->file_size;
2997 new_tags.extra_is_shrink = oh->is_shrink;
2998 new_tags.extra_equiv_id = oh->equiv_id;
2999 new_tags.extra_shadows = (oh->shadows_obj > 0) ? 1 : 0;
3000 new_tags.extra_obj_type = in->variant_type;
3002 yaffs_verify_oh(in, oh, &new_tags, 1);
3004 /* Create new chunk in NAND */
3006 yaffs_write_new_chunk(dev, buffer, &new_tags,
3007 (prev_chunk_id > 0) ? 1 : 0);
3009 if (new_chunk_id >= 0) {
3011 in->hdr_chunk = new_chunk_id;
3013 if (prev_chunk_id > 0) {
3014 yaffs_chunk_del(dev, prev_chunk_id, 1,
3018 if (!yaffs_obj_cache_dirty(in))
3021 /* If this was a shrink, then mark the block that the chunk lives on */
3023 bi = yaffs_get_block_info(in->my_dev,
3027 bi->has_shrink_hdr = 1;
3032 ret_val = new_chunk_id;
3037 yaffs_release_temp_buffer(dev, buffer, __LINE__);
3042 /*------------------------ Short Operations Cache ----------------------------------------
3043 * In many situations where there is no high level buffering a lot of
3044 * reads might be short sequential reads, and a lot of writes may be short
3045 * sequential writes. eg. scanning/writing a jpeg file.
3046 * In these cases, a short read/write cache can provide a huge perfomance
3047 * benefit with dumb-as-a-rock code.
3048 * In Linux, the page cache provides read buffering and the short op cache
3049 * provides write buffering.
3051 * There are a limited number (~10) of cache chunks per device so that we don't
3052 * need a very intelligent search.
3055 static int yaffs_obj_cache_dirty(struct yaffs_obj *obj)
3057 struct yaffs_dev *dev = obj->my_dev;
3059 struct yaffs_cache *cache;
3060 int n_caches = obj->my_dev->param.n_caches;
3062 for (i = 0; i < n_caches; i++) {
3063 cache = &dev->cache[i];
3064 if (cache->object == obj && cache->dirty)
3071 static void yaffs_flush_file_cache(struct yaffs_obj *obj)
3073 struct yaffs_dev *dev = obj->my_dev;
3074 int lowest = -99; /* Stop compiler whining. */
3076 struct yaffs_cache *cache;
3077 int chunk_written = 0;
3078 int n_caches = obj->my_dev->param.n_caches;
3084 /* Find the dirty cache for this object with the lowest chunk id. */
3085 for (i = 0; i < n_caches; i++) {
3086 if (dev->cache[i].object == obj &&
3087 dev->cache[i].dirty) {
3089 || dev->cache[i].chunk_id <
3091 cache = &dev->cache[i];
3092 lowest = cache->chunk_id;
3097 if (cache && !cache->locked) {
3098 /* Write it out and free it up */
3101 yaffs_wr_data_obj(cache->object,
3106 cache->object = NULL;
3109 } while (cache && chunk_written > 0);
3112 /* Hoosterman, disk full while writing cache out. */
3113 T(YAFFS_TRACE_ERROR,
3115 ("yaffs tragedy: no space during cache write"
3123 /*yaffs_flush_whole_cache(dev)
3128 void yaffs_flush_whole_cache(struct yaffs_dev *dev)
3130 struct yaffs_obj *obj;
3131 int n_caches = dev->param.n_caches;
3134 /* Find a dirty object in the cache and flush it...
3135 * until there are no further dirty objects.
3139 for (i = 0; i < n_caches && !obj; i++) {
3140 if (dev->cache[i].object && dev->cache[i].dirty)
3141 obj = dev->cache[i].object;
3145 yaffs_flush_file_cache(obj);
3151 /* Grab us a cache chunk for use.
3152 * First look for an empty one.
3153 * Then look for the least recently used non-dirty one.
3154 * Then look for the least recently used dirty one...., flush and look again.
3156 static struct yaffs_cache *yaffs_grab_chunk_worker(struct yaffs_dev *dev)
3160 if (dev->param.n_caches > 0) {
3161 for (i = 0; i < dev->param.n_caches; i++) {
3162 if (!dev->cache[i].object)
3163 return &dev->cache[i];
3170 static struct yaffs_cache *yaffs_grab_chunk_cache(struct yaffs_dev *dev)
3172 struct yaffs_cache *cache;
3173 struct yaffs_obj *the_obj;
3178 if (dev->param.n_caches > 0) {
3179 /* Try find a non-dirty one... */
3181 cache = yaffs_grab_chunk_worker(dev);
3184 /* They were all dirty, find the last recently used object and flush
3185 * its cache, then find again.
3186 * NB what's here is not very accurate, we actually flush the object
3187 * the last recently used page.
3190 /* With locking we can't assume we can use entry zero */
3197 for (i = 0; i < dev->param.n_caches; i++) {
3198 if (dev->cache[i].object &&
3199 !dev->cache[i].locked &&
3200 (dev->cache[i].last_use < usage
3202 usage = dev->cache[i].last_use;
3203 the_obj = dev->cache[i].object;
3204 cache = &dev->cache[i];
3209 if (!cache || cache->dirty) {
3210 /* Flush and try again */
3211 yaffs_flush_file_cache(the_obj);
3212 cache = yaffs_grab_chunk_worker(dev);
3222 /* Find a cached chunk */
3223 static struct yaffs_cache *yaffs_find_chunk_cache(const struct yaffs_obj *obj,
3226 struct yaffs_dev *dev = obj->my_dev;
3228 if (dev->param.n_caches > 0) {
3229 for (i = 0; i < dev->param.n_caches; i++) {
3230 if (dev->cache[i].object == obj &&
3231 dev->cache[i].chunk_id == chunk_id) {
3234 return &dev->cache[i];
3241 /* Mark the chunk for the least recently used algorithym */
3242 static void yaffs_use_cache(struct yaffs_dev *dev, struct yaffs_cache *cache,
3246 if (dev->param.n_caches > 0) {
3247 if (dev->cache_last_use < 0 || dev->cache_last_use > 100000000) {
3248 /* Reset the cache usages */
3250 for (i = 1; i < dev->param.n_caches; i++)
3251 dev->cache[i].last_use = 0;
3253 dev->cache_last_use = 0;
3256 dev->cache_last_use++;
3258 cache->last_use = dev->cache_last_use;
3265 /* Invalidate a single cache page.
3266 * Do this when a whole page gets written,
3267 * ie the short cache for this page is no longer valid.
3269 static void yaffs_invalidate_chunk_cache(struct yaffs_obj *object, int chunk_id)
3271 if (object->my_dev->param.n_caches > 0) {
3272 struct yaffs_cache *cache =
3273 yaffs_find_chunk_cache(object, chunk_id);
3276 cache->object = NULL;
3280 /* Invalidate all the cache pages associated with this object
3281 * Do this whenever ther file is deleted or resized.
3283 static void yaffs_invalidate_whole_cache(struct yaffs_obj *in)
3286 struct yaffs_dev *dev = in->my_dev;
3288 if (dev->param.n_caches > 0) {
3289 /* Invalidate it. */
3290 for (i = 0; i < dev->param.n_caches; i++) {
3291 if (dev->cache[i].object == in)
3292 dev->cache[i].object = NULL;
3297 /*--------------------- File read/write ------------------------
3298 * Read and write have very similar structures.
3299 * In general the read/write has three parts to it
3300 * An incomplete chunk to start with (if the read/write is not chunk-aligned)
3301 * Some complete chunks
3302 * An incomplete chunk to end off with
3304 * Curve-balls: the first chunk might also be the last chunk.
3307 int yaffs_file_rd(struct yaffs_obj *in, u8 * buffer, loff_t offset, int n_bytes)
3315 struct yaffs_cache *cache;
3317 struct yaffs_dev *dev;
3322 /* chunk = offset / dev->data_bytes_per_chunk + 1; */
3323 /* start = offset % dev->data_bytes_per_chunk; */
3324 yaffs_addr_to_chunk(dev, offset, &chunk, &start);
3327 /* OK now check for the curveball where the start and end are in
3330 if ((start + n) < dev->data_bytes_per_chunk)
3333 n_copy = dev->data_bytes_per_chunk - start;
3335 cache = yaffs_find_chunk_cache(in, chunk);
3337 /* If the chunk is already in the cache or it is less than a whole chunk
3338 * or we're using inband tags then use the cache (if there is caching)
3339 * else bypass the cache.
3341 if (cache || n_copy != dev->data_bytes_per_chunk
3342 || dev->param.inband_tags) {
3343 if (dev->param.n_caches > 0) {
3345 /* If we can't find the data in the cache, then load it up. */
3349 yaffs_grab_chunk_cache(in->my_dev);
3351 cache->chunk_id = chunk;
3354 yaffs_rd_data_obj(in, chunk,
3359 yaffs_use_cache(dev, cache, 0);
3363 memcpy(buffer, &cache->data[start], n_copy);
3367 /* Read into the local buffer then copy.. */
3370 yaffs_get_temp_buffer(dev, __LINE__);
3371 yaffs_rd_data_obj(in, chunk, local_buffer);
3373 memcpy(buffer, &local_buffer[start], n_copy);
3375 yaffs_release_temp_buffer(dev, local_buffer,
3381 /* A full chunk. Read directly into the supplied buffer. */
3382 yaffs_rd_data_obj(in, chunk, buffer);
3396 int yaffs_do_file_wr(struct yaffs_obj *in, const u8 * buffer, loff_t offset,
3397 int n_bytes, int write_trhrough)
3406 int start_write = offset;
3407 int chunk_written = 0;
3411 struct yaffs_dev *dev;
3415 while (n > 0 && chunk_written >= 0) {
3416 yaffs_addr_to_chunk(dev, offset, &chunk, &start);
3418 if (chunk * dev->data_bytes_per_chunk + start != offset ||
3419 start >= dev->data_bytes_per_chunk) {
3420 T(YAFFS_TRACE_ERROR,
3422 ("AddrToChunk of offset %d gives chunk %d start %d"
3423 TENDSTR), (int)offset, chunk, start));
3425 chunk++; /* File pos to chunk in file offset */
3427 /* OK now check for the curveball where the start and end are in
3431 if ((start + n) < dev->data_bytes_per_chunk) {
3434 /* Now folks, to calculate how many bytes to write back....
3435 * If we're overwriting and not writing to then end of file then
3436 * we need to write back as much as was there before.
3439 chunk_start = ((chunk - 1) * dev->data_bytes_per_chunk);
3441 if (chunk_start > in->variant.file_variant.file_size)
3442 n_bytes_read = 0; /* Past end of file */
3445 in->variant.file_variant.file_size -
3448 if (n_bytes_read > dev->data_bytes_per_chunk)
3449 n_bytes_read = dev->data_bytes_per_chunk;
3453 (start + n)) ? n_bytes_read : (start + n);
3456 || n_writeback > dev->data_bytes_per_chunk)
3460 n_copy = dev->data_bytes_per_chunk - start;
3461 n_writeback = dev->data_bytes_per_chunk;
3464 if (n_copy != dev->data_bytes_per_chunk
3465 || dev->param.inband_tags) {
3466 /* An incomplete start or end chunk (or maybe both start and end chunk),
3467 * or we're using inband tags, so we want to use the cache buffers.
3469 if (dev->param.n_caches > 0) {
3470 struct yaffs_cache *cache;
3471 /* If we can't find the data in the cache, then load the cache */
3472 cache = yaffs_find_chunk_cache(in, chunk);
3475 && yaffs_check_alloc_available(dev, 1)) {
3476 cache = yaffs_grab_chunk_cache(dev);
3478 cache->chunk_id = chunk;
3481 yaffs_rd_data_obj(in, chunk,
3485 !yaffs_check_alloc_available(dev,
3487 /* Drop the cache if it was a read cache item and
3488 * no space check has been made for it.
3494 yaffs_use_cache(dev, cache, 1);
3497 memcpy(&cache->data[start], buffer,
3501 cache->n_bytes = n_writeback;
3503 if (write_trhrough) {
3514 chunk_written = -1; /* fail the write */
3517 /* An incomplete start or end chunk (or maybe both start and end chunk)
3518 * Read into the local buffer then copy, then copy over and write back.
3522 yaffs_get_temp_buffer(dev, __LINE__);
3524 yaffs_rd_data_obj(in, chunk, local_buffer);
3526 memcpy(&local_buffer[start], buffer, n_copy);
3529 yaffs_wr_data_obj(in, chunk,
3533 yaffs_release_temp_buffer(dev, local_buffer,
3539 /* A full chunk. Write directly from the supplied buffer. */
3542 yaffs_wr_data_obj(in, chunk, buffer,
3543 dev->data_bytes_per_chunk, 0);
3545 /* Since we've overwritten the cached data, we better invalidate it. */
3546 yaffs_invalidate_chunk_cache(in, chunk);
3549 if (chunk_written >= 0) {
3558 /* Update file object */
3560 if ((start_write + n_done) > in->variant.file_variant.file_size)
3561 in->variant.file_variant.file_size = (start_write + n_done);
3568 int yaffs_wr_file(struct yaffs_obj *in, const u8 * buffer, loff_t offset,
3569 int n_bytes, int write_trhrough)
3571 yaffs2_handle_hole(in, offset);
3572 return yaffs_do_file_wr(in, buffer, offset, n_bytes, write_trhrough);
3575 /* ---------------------- File resizing stuff ------------------ */
3577 static void yaffs_prune_chunks(struct yaffs_obj *in, int new_size)
3580 struct yaffs_dev *dev = in->my_dev;
3581 int old_size = in->variant.file_variant.file_size;
3583 int last_del = 1 + (old_size - 1) / dev->data_bytes_per_chunk;
3585 int start_del = 1 + (new_size + dev->data_bytes_per_chunk - 1) /
3586 dev->data_bytes_per_chunk;
3590 /* Delete backwards so that we don't end up with holes if
3591 * power is lost part-way through the operation.
3593 for (i = last_del; i >= start_del; i--) {
3594 /* NB this could be optimised somewhat,
3595 * eg. could retrieve the tags and write them without
3596 * using yaffs_chunk_del
3599 chunk_id = yaffs_find_del_file_chunk(in, i, NULL);
3602 (dev->internal_start_block *
3603 dev->param.chunks_per_block)
3605 ((dev->internal_end_block +
3606 1) * dev->param.chunks_per_block)) {
3607 T(YAFFS_TRACE_ALWAYS,
3609 ("Found daft chunk_id %d for %d" TENDSTR),
3612 in->n_data_chunks--;
3613 yaffs_chunk_del(dev, chunk_id, 1, __LINE__);
3620 void yaffs_resize_file_down(struct yaffs_obj *obj, loff_t new_size)
3624 struct yaffs_dev *dev = obj->my_dev;
3626 yaffs_addr_to_chunk(dev, new_size, &new_full, &new_partial);
3628 yaffs_prune_chunks(obj, new_size);
3630 if (new_partial != 0) {
3631 int last_chunk = 1 + new_full;
3632 u8 *local_buffer = yaffs_get_temp_buffer(dev, __LINE__);
3634 /* Got to read and rewrite the last chunk with its new size and zero pad */
3635 yaffs_rd_data_obj(obj, last_chunk, local_buffer);
3636 memset(local_buffer + new_partial, 0,
3637 dev->data_bytes_per_chunk - new_partial);
3639 yaffs_wr_data_obj(obj, last_chunk, local_buffer,
3642 yaffs_release_temp_buffer(dev, local_buffer, __LINE__);
3645 obj->variant.file_variant.file_size = new_size;
3647 yaffs_prune_tree(dev, &obj->variant.file_variant);
3650 int yaffs_resize_file(struct yaffs_obj *in, loff_t new_size)
3652 struct yaffs_dev *dev = in->my_dev;
3653 int old_size = in->variant.file_variant.file_size;
3655 yaffs_flush_file_cache(in);
3656 yaffs_invalidate_whole_cache(in);
3658 yaffs_check_gc(dev, 0);
3660 if (in->variant_type != YAFFS_OBJECT_TYPE_FILE)
3663 if (new_size == old_size)
3666 if (new_size > old_size) {
3667 yaffs2_handle_hole(in, new_size);
3668 in->variant.file_variant.file_size = new_size;
3670 /* new_size < old_size */
3671 yaffs_resize_file_down(in, new_size);
3674 /* Write a new object header to reflect the resize.
3675 * show we've shrunk the file, if need be
3676 * Do this only if the file is not in the deleted directories
3677 * and is not shadowed.
3681 in->parent->obj_id != YAFFS_OBJECTID_UNLINKED &&
3682 in->parent->obj_id != YAFFS_OBJECTID_DELETED)
3683 yaffs_update_oh(in, NULL, 0, 0, 0, NULL);
3688 int yaffs_flush_file(struct yaffs_obj *in, int update_time, int data_sync)
3692 yaffs_flush_file_cache(in);
3693 if (data_sync) /* Only sync data */
3697 yaffs_load_current_time(in, 0, 0);
3699 ret_val = (yaffs_update_oh(in, NULL, 0, 0, 0, NULL) >=
3700 0) ? YAFFS_OK : YAFFS_FAIL;
3710 static int yaffs_generic_obj_del(struct yaffs_obj *in)
3713 /* First off, invalidate the file's data in the cache, without flushing. */
3714 yaffs_invalidate_whole_cache(in);
3716 if (in->my_dev->param.is_yaffs2 && (in->parent != in->my_dev->del_dir)) {
3717 /* Move to the unlinked directory so we have a record that it was deleted. */
3718 yaffs_change_obj_name(in, in->my_dev->del_dir, _Y("deleted"), 0,
3723 yaffs_remove_obj_from_dir(in);
3724 yaffs_chunk_del(in->my_dev, in->hdr_chunk, 1, __LINE__);
3732 /* yaffs_del_file deletes the whole file data
3733 * and the inode associated with the file.
3734 * It does not delete the links associated with the file.
3736 static int yaffs_unlink_file_if_needed(struct yaffs_obj *in)
3741 struct yaffs_dev *dev = in->my_dev;
3748 yaffs_change_obj_name(in, in->my_dev->del_dir,
3749 _Y("deleted"), 0, 0);
3750 T(YAFFS_TRACE_TRACING,
3751 (TSTR("yaffs: immediate deletion of file %d" TENDSTR),
3754 in->my_dev->n_deleted_files++;
3755 if (dev->param.disable_soft_del || dev->param.is_yaffs2)
3756 yaffs_resize_file(in, 0);
3757 yaffs_soft_del_file(in);
3760 yaffs_change_obj_name(in, in->my_dev->unlinked_dir,
3761 _Y("unlinked"), 0, 0);
3767 int yaffs_del_file(struct yaffs_obj *in)
3769 int ret_val = YAFFS_OK;
3770 int deleted; /* Need to cache value on stack if in is freed */
3771 struct yaffs_dev *dev = in->my_dev;
3773 if (dev->param.disable_soft_del || dev->param.is_yaffs2)
3774 yaffs_resize_file(in, 0);
3776 if (in->n_data_chunks > 0) {
3777 /* Use soft deletion if there is data in the file.
3778 * That won't be the case if it has been resized to zero.
3781 ret_val = yaffs_unlink_file_if_needed(in);
3783 deleted = in->deleted;
3785 if (ret_val == YAFFS_OK && in->unlinked && !in->deleted) {
3788 in->my_dev->n_deleted_files++;
3789 yaffs_soft_del_file(in);
3791 return deleted ? YAFFS_OK : YAFFS_FAIL;
3793 /* The file has no data chunks so we toss it immediately */
3794 yaffs_free_tnode(in->my_dev, in->variant.file_variant.top);
3795 in->variant.file_variant.top = NULL;
3796 yaffs_generic_obj_del(in);
3802 static int yaffs_is_non_empty_dir(struct yaffs_obj *obj)
3804 return (obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) &&
3805 !(list_empty(&obj->variant.dir_variant.children));
3808 static int yaffs_del_dir(struct yaffs_obj *obj)
3810 /* First check that the directory is empty. */
3811 if (yaffs_is_non_empty_dir(obj))
3814 return yaffs_generic_obj_del(obj);
3817 static int yaffs_del_symlink(struct yaffs_obj *in)
3819 if (in->variant.symlink_variant.alias)
3820 YFREE(in->variant.symlink_variant.alias);
3821 in->variant.symlink_variant.alias = NULL;
3823 return yaffs_generic_obj_del(in);
3826 static int yaffs_del_link(struct yaffs_obj *in)
3828 /* remove this hardlink from the list assocaited with the equivalent
3831 list_del_init(&in->hard_links);
3832 return yaffs_generic_obj_del(in);
3835 int yaffs_del_obj(struct yaffs_obj *obj)
3838 switch (obj->variant_type) {
3839 case YAFFS_OBJECT_TYPE_FILE:
3840 ret_val = yaffs_del_file(obj);
3842 case YAFFS_OBJECT_TYPE_DIRECTORY:
3843 if (!list_empty(&obj->variant.dir_variant.dirty)) {
3844 T(YAFFS_TRACE_BACKGROUND,
3846 ("Remove object %d from dirty directories" TENDSTR),
3848 list_del_init(&obj->variant.dir_variant.dirty);
3850 return yaffs_del_dir(obj);
3852 case YAFFS_OBJECT_TYPE_SYMLINK:
3853 ret_val = yaffs_del_symlink(obj);
3855 case YAFFS_OBJECT_TYPE_HARDLINK:
3856 ret_val = yaffs_del_link(obj);
3858 case YAFFS_OBJECT_TYPE_SPECIAL:
3859 ret_val = yaffs_generic_obj_del(obj);
3861 case YAFFS_OBJECT_TYPE_UNKNOWN:
3863 break; /* should not happen. */
3869 static int yaffs_unlink_worker(struct yaffs_obj *obj)
3878 yaffs_update_parent(obj->parent);
3880 if (obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) {
3881 return yaffs_del_link(obj);
3882 } else if (!list_empty(&obj->hard_links)) {
3883 /* Curve ball: We're unlinking an object that has a hardlink.
3885 * This problem arises because we are not strictly following
3886 * The Linux link/inode model.
3888 * We can't really delete the object.
3889 * Instead, we do the following:
3890 * - Select a hardlink.
3891 * - Unhook it from the hard links
3892 * - Move it from its parent directory (so that the rename can work)
3893 * - Rename the object to the hardlink's name.
3894 * - Delete the hardlink
3897 struct yaffs_obj *hl;
3898 struct yaffs_obj *parent;
3900 YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
3902 hl = list_entry(obj->hard_links.next, struct yaffs_obj,
3905 yaffs_get_obj_name(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
3906 parent = hl->parent;
3908 list_del_init(&hl->hard_links);
3910 yaffs_add_obj_to_dir(obj->my_dev->unlinked_dir, hl);
3912 ret_val = yaffs_change_obj_name(obj, parent, name, 0, 0);
3914 if (ret_val == YAFFS_OK)
3915 ret_val = yaffs_generic_obj_del(hl);
3919 } else if (del_now) {
3920 switch (obj->variant_type) {
3921 case YAFFS_OBJECT_TYPE_FILE:
3922 return yaffs_del_file(obj);
3924 case YAFFS_OBJECT_TYPE_DIRECTORY:
3925 list_del_init(&obj->variant.dir_variant.dirty);
3926 return yaffs_del_dir(obj);
3928 case YAFFS_OBJECT_TYPE_SYMLINK:
3929 return yaffs_del_symlink(obj);
3931 case YAFFS_OBJECT_TYPE_SPECIAL:
3932 return yaffs_generic_obj_del(obj);
3934 case YAFFS_OBJECT_TYPE_HARDLINK:
3935 case YAFFS_OBJECT_TYPE_UNKNOWN:
3939 } else if (yaffs_is_non_empty_dir(obj)) {
3942 return yaffs_change_obj_name(obj, obj->my_dev->unlinked_dir,
3943 _Y("unlinked"), 0, 0);
3947 static int yaffs_unlink_obj(struct yaffs_obj *obj)
3950 if (obj && obj->unlink_allowed)
3951 return yaffs_unlink_worker(obj);
3957 int yaffs_unlinker(struct yaffs_obj *dir, const YCHAR * name)
3959 struct yaffs_obj *obj;
3961 obj = yaffs_find_by_name(dir, name);
3962 return yaffs_unlink_obj(obj);
3965 /*----------------------- Initialisation Scanning ---------------------- */
3967 void yaffs_handle_shadowed_obj(struct yaffs_dev *dev, int obj_id,
3968 int backward_scanning)
3970 struct yaffs_obj *obj;
3972 if (!backward_scanning) {
3973 /* Handle YAFFS1 forward scanning case
3974 * For YAFFS1 we always do the deletion
3978 /* Handle YAFFS2 case (backward scanning)
3979 * If the shadowed object exists then ignore.
3981 obj = yaffs_find_by_number(dev, obj_id);
3986 /* Let's create it (if it does not exist) assuming it is a file so that it can do shrinking etc.
3987 * We put it in unlinked dir to be cleaned up after the scanning
3990 yaffs_find_or_create_by_number(dev, obj_id, YAFFS_OBJECT_TYPE_FILE);
3993 obj->is_shadowed = 1;
3994 yaffs_add_obj_to_dir(dev->unlinked_dir, obj);
3995 obj->variant.file_variant.shrink_size = 0;
3996 obj->valid = 1; /* So that we don't read any other info for this file */
4000 void yaffs_link_fixup(struct yaffs_dev *dev, struct yaffs_obj *hard_list)
4002 struct yaffs_obj *hl;
4003 struct yaffs_obj *in;
4007 hard_list = (struct yaffs_obj *)(hard_list->hard_links.next);
4009 in = yaffs_find_by_number(dev,
4011 hardlink_variant.equiv_id);
4014 /* Add the hardlink pointers */
4015 hl->variant.hardlink_variant.equiv_obj = in;
4016 list_add(&hl->hard_links, &in->hard_links);
4018 /* Todo Need to report/handle this better.
4019 * Got a problem... hardlink to a non-existant object
4021 hl->variant.hardlink_variant.equiv_obj = NULL;
4022 INIT_LIST_HEAD(&hl->hard_links);
4028 static void yaffs_strip_deleted_objs(struct yaffs_dev *dev)
4031 * Sort out state of unlinked and deleted objects after scanning.
4033 struct list_head *i;
4034 struct list_head *n;
4035 struct yaffs_obj *l;
4040 /* Soft delete all the unlinked files */
4041 list_for_each_safe(i, n,
4042 &dev->unlinked_dir->variant.dir_variant.children) {
4044 l = list_entry(i, struct yaffs_obj, siblings);
4049 list_for_each_safe(i, n, &dev->del_dir->variant.dir_variant.children) {
4051 l = list_entry(i, struct yaffs_obj, siblings);
4059 * This code iterates through all the objects making sure that they are rooted.
4060 * Any unrooted objects are re-rooted in lost+found.
4061 * An object needs to be in one of:
4062 * - Directly under deleted, unlinked
4063 * - Directly or indirectly under root.
4066 * This code assumes that we don't ever change the current relationships between
4068 * root_dir->parent == unlinked_dir->parent == del_dir->parent == NULL
4069 * lost-n-found->parent == root_dir
4071 * This fixes the problem where directories might have inadvertently been deleted
4072 * leaving the object "hanging" without being rooted in the directory tree.
4075 static int yaffs_has_null_parent(struct yaffs_dev *dev, struct yaffs_obj *obj)
4077 return (obj == dev->del_dir ||
4078 obj == dev->unlinked_dir || obj == dev->root_dir);
4081 static void yaffs_fix_hanging_objs(struct yaffs_dev *dev)
4083 struct yaffs_obj *obj;
4084 struct yaffs_obj *parent;
4086 struct list_head *lh;
4087 struct list_head *n;
4094 /* Iterate through the objects in each hash entry,
4095 * looking at each object.
4096 * Make sure it is rooted.
4099 for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
4100 list_for_each_safe(lh, n, &dev->obj_bucket[i].list) {
4103 list_entry(lh, struct yaffs_obj, hash_link);
4104 parent = obj->parent;
4106 if (yaffs_has_null_parent(dev, obj)) {
4107 /* These directories are not hanging */
4110 || parent->variant_type !=
4111 YAFFS_OBJECT_TYPE_DIRECTORY) {
4113 } else if (yaffs_has_null_parent(dev, parent)) {
4117 * Need to follow the parent chain to see if it is hanging.
4122 while (parent != dev->root_dir &&
4124 parent->parent->variant_type ==
4125 YAFFS_OBJECT_TYPE_DIRECTORY
4126 && depth_limit > 0) {
4127 parent = parent->parent;
4130 if (parent != dev->root_dir)
4136 ("Hanging object %d moved to lost and found"
4137 TENDSTR), obj->obj_id));
4138 yaffs_add_obj_to_dir(dev->lost_n_found,
4147 * Delete directory contents for cleaning up lost and found.
4149 static void yaffs_del_dir_contents(struct yaffs_obj *dir)
4151 struct yaffs_obj *obj;
4152 struct list_head *lh;
4153 struct list_head *n;
4155 if (dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
4158 list_for_each_safe(lh, n, &dir->variant.dir_variant.children) {
4160 obj = list_entry(lh, struct yaffs_obj, siblings);
4161 if (obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY)
4162 yaffs_del_dir_contents(obj);
4165 (TSTR("Deleting lost_found object %d" TENDSTR),
4168 /* Need to use UnlinkObject since Delete would not handle
4169 * hardlinked objects correctly.
4171 yaffs_unlink_obj(obj);
4177 static void yaffs_empty_l_n_f(struct yaffs_dev *dev)
4179 yaffs_del_dir_contents(dev->lost_n_found);
4182 static void yaffs_check_obj_details_loaded(struct yaffs_obj *in)
4185 struct yaffs_obj_hdr *oh;
4186 struct yaffs_dev *dev;
4187 struct yaffs_ext_tags tags;
4189 int alloc_failed = 0;
4196 if (in->lazy_loaded && in->hdr_chunk > 0) {
4197 in->lazy_loaded = 0;
4198 chunk_data = yaffs_get_temp_buffer(dev, __LINE__);
4201 yaffs_rd_chunk_tags_nand(dev, in->hdr_chunk, chunk_data,
4203 oh = (struct yaffs_obj_hdr *)chunk_data;
4205 in->yst_mode = oh->yst_mode;
4206 yaffs_load_attribs(in, oh);
4207 yaffs_set_obj_name_from_oh(in, oh);
4209 if (in->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) {
4210 in->variant.symlink_variant.alias =
4211 yaffs_clone_str(oh->alias);
4212 if (!in->variant.symlink_variant.alias)
4213 alloc_failed = 1; /* Not returned to caller */
4216 yaffs_release_temp_buffer(dev, chunk_data, __LINE__);
4220 /*------------------------------ Directory Functions ----------------------------- */
4223 *yaffs_update_parent() handles fixing a directories mtime and ctime when a new
4224 * link (ie. name) is created or deleted in the directory.
4227 * create dir/a : update dir's mtime/ctime
4228 * rm dir/a: update dir's mtime/ctime
4229 * modify dir/a: don't update dir's mtimme/ctime
4231 * This can be handled immediately or defered. Defering helps reduce the number
4232 * of updates when many files in a directory are changed within a brief period.
4234 * If the directory updating is defered then yaffs_update_dirty_dirs must be
4235 * called periodically.
4238 static void yaffs_update_parent(struct yaffs_obj *obj)
4240 struct yaffs_dev *dev;
4245 yaffs_load_current_time(obj, 0, 1);
4246 if (dev->param.defered_dir_update) {
4247 struct list_head *link = &obj->variant.dir_variant.dirty;
4249 if (list_empty(link)) {
4250 list_add(link, &dev->dirty_dirs);
4251 T(YAFFS_TRACE_BACKGROUND,
4252 (TSTR("Added object %d to dirty directories" TENDSTR),
4257 yaffs_update_oh(obj, NULL, 0, 0, 0, NULL);
4261 void yaffs_update_dirty_dirs(struct yaffs_dev *dev)
4263 struct list_head *link;
4264 struct yaffs_obj *obj;
4265 struct yaffs_dir_var *d_s;
4266 union yaffs_obj_var *o_v;
4268 T(YAFFS_TRACE_BACKGROUND, (TSTR("Update dirty directories" TENDSTR)));
4270 while (!list_empty(&dev->dirty_dirs)) {
4271 link = dev->dirty_dirs.next;
4272 list_del_init(link);
4274 d_s = list_entry(link, struct yaffs_dir_var, dirty);
4275 o_v = list_entry(d_s, union yaffs_obj_var, dir_variant);
4276 obj = list_entry(o_v, struct yaffs_obj, variant);
4278 T(YAFFS_TRACE_BACKGROUND,
4279 (TSTR("Update directory %d" TENDSTR), obj->obj_id));
4282 yaffs_update_oh(obj, NULL, 0, 0, 0, NULL);
4286 static void yaffs_remove_obj_from_dir(struct yaffs_obj *obj)
4288 struct yaffs_dev *dev = obj->my_dev;
4289 struct yaffs_obj *parent;
4291 yaffs_verify_obj_in_dir(obj);
4292 parent = obj->parent;
4294 yaffs_verify_dir(parent);
4296 if (dev && dev->param.remove_obj_fn)
4297 dev->param.remove_obj_fn(obj);
4299 list_del_init(&obj->siblings);
4302 yaffs_verify_dir(parent);
4305 void yaffs_add_obj_to_dir(struct yaffs_obj *directory, struct yaffs_obj *obj)
4308 T(YAFFS_TRACE_ALWAYS,
4310 ("tragedy: Trying to add an object to a null pointer directory"
4315 if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
4316 T(YAFFS_TRACE_ALWAYS,
4318 ("tragedy: Trying to add an object to a non-directory"
4323 if (obj->siblings.prev == NULL) {
4324 /* Not initialised */
4328 yaffs_verify_dir(directory);
4330 yaffs_remove_obj_from_dir(obj);
4333 list_add(&obj->siblings, &directory->variant.dir_variant.children);
4334 obj->parent = directory;
4336 if (directory == obj->my_dev->unlinked_dir
4337 || directory == obj->my_dev->del_dir) {
4339 obj->my_dev->n_unlinked_files++;
4340 obj->rename_allowed = 0;
4343 yaffs_verify_dir(directory);
4344 yaffs_verify_obj_in_dir(obj);
4347 struct yaffs_obj *yaffs_find_by_name(struct yaffs_obj *directory,
4352 struct list_head *i;
4353 YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
4355 struct yaffs_obj *l;
4361 T(YAFFS_TRACE_ALWAYS,
4363 ("tragedy: yaffs_find_by_name: null pointer directory"
4368 if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
4369 T(YAFFS_TRACE_ALWAYS,
4370 (TSTR("tragedy: yaffs_find_by_name: non-directory" TENDSTR)));
4374 sum = yaffs_calc_name_sum(name);
4376 list_for_each(i, &directory->variant.dir_variant.children) {
4378 l = list_entry(i, struct yaffs_obj, siblings);
4380 if (l->parent != directory)
4383 yaffs_check_obj_details_loaded(l);
4385 /* Special case for lost-n-found */
4386 if (l->obj_id == YAFFS_OBJECTID_LOSTNFOUND) {
4387 if (!yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME))
4389 } else if (yaffs_sum_cmp(l->sum, sum)
4390 || l->hdr_chunk <= 0) {
4391 /* LostnFound chunk called Objxxx
4394 yaffs_get_obj_name(l, buffer,
4395 YAFFS_MAX_NAME_LENGTH + 1);
4397 (name, buffer, YAFFS_MAX_NAME_LENGTH) == 0)
4406 /* GetEquivalentObject dereferences any hard links to get to the
4410 struct yaffs_obj *yaffs_get_equivalent_obj(struct yaffs_obj *obj)
4412 if (obj && obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) {
4413 /* We want the object id of the equivalent object, not this one */
4414 obj = obj->variant.hardlink_variant.equiv_obj;
4415 yaffs_check_obj_details_loaded(obj);
4421 * A note or two on object names.
4422 * * If the object name is missing, we then make one up in the form objnnn
4424 * * ASCII names are stored in the object header's name field from byte zero
4425 * * Unicode names are historically stored starting from byte zero.
4427 * Then there are automatic Unicode names...
4428 * The purpose of these is to save names in a way that can be read as
4429 * ASCII or Unicode names as appropriate, thus allowing a Unicode and ASCII
4430 * system to share files.
4432 * These automatic unicode are stored slightly differently...
4433 * - If the name can fit in the ASCII character space then they are saved as
4434 * ascii names as per above.
4435 * - If the name needs Unicode then the name is saved in Unicode
4436 * starting at oh->name[1].
4439 static void yaffs_fix_null_name(struct yaffs_obj *obj, YCHAR * name,
4442 /* Create an object name if we could not find one. */
4443 if (yaffs_strnlen(name, YAFFS_MAX_NAME_LENGTH) == 0) {
4444 YCHAR local_name[20];
4445 YCHAR num_string[20];
4446 YCHAR *x = &num_string[19];
4447 unsigned v = obj->obj_id;
4451 *x = '0' + (v % 10);
4454 /* make up a name */
4455 yaffs_strcpy(local_name, YAFFS_LOSTNFOUND_PREFIX);
4456 yaffs_strcat(local_name, x);
4457 yaffs_strncpy(name, local_name, buffer_size - 1);
4461 static void yaffs_load_name_from_oh(struct yaffs_dev *dev, YCHAR * name,
4462 const YCHAR * oh_name, int buff_size)
4464 #ifdef CONFIG_YAFFS_AUTO_UNICODE
4465 if (dev->param.auto_unicode) {
4467 /* It is an ASCII name, so do an ASCII to unicode conversion */
4468 const char *ascii_oh_name = (const char *)oh_name;
4469 int n = buff_size - 1;
4470 while (n > 0 && *ascii_oh_name) {
4471 *name = *ascii_oh_name;
4477 yaffs_strncpy(name, oh_name + 1, buff_size - 1);
4483 yaffs_strncpy(name, oh_name, buff_size - 1);
4487 static void yaffs_load_oh_from_name(struct yaffs_dev *dev, YCHAR * oh_name,
4490 #ifdef CONFIG_YAFFS_AUTO_UNICODE
4495 if (dev->param.auto_unicode) {
4500 /* Figure out if the name will fit in ascii character set */
4501 while (is_ascii && *w) {
4508 /* It is an ASCII name, so do a unicode to ascii conversion */
4509 char *ascii_oh_name = (char *)oh_name;
4510 int n = YAFFS_MAX_NAME_LENGTH - 1;
4511 while (n > 0 && *name) {
4512 *ascii_oh_name = *name;
4518 /* It is a unicode name, so save starting at the second YCHAR */
4520 yaffs_strncpy(oh_name + 1, name,
4521 YAFFS_MAX_NAME_LENGTH - 2);
4527 yaffs_strncpy(oh_name, name, YAFFS_MAX_NAME_LENGTH - 1);
4532 int yaffs_get_obj_name(struct yaffs_obj *obj, YCHAR * name, int buffer_size)
4534 memset(name, 0, buffer_size * sizeof(YCHAR));
4536 yaffs_check_obj_details_loaded(obj);
4538 if (obj->obj_id == YAFFS_OBJECTID_LOSTNFOUND) {
4539 yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffer_size - 1);
4541 #ifndef CONFIG_YAFFS_NO_SHORT_NAMES
4542 else if (obj->short_name[0]) {
4543 yaffs_strcpy(name, obj->short_name);
4546 else if (obj->hdr_chunk > 0) {
4548 u8 *buffer = yaffs_get_temp_buffer(obj->my_dev, __LINE__);
4550 struct yaffs_obj_hdr *oh = (struct yaffs_obj_hdr *)buffer;
4552 memset(buffer, 0, obj->my_dev->data_bytes_per_chunk);
4554 if (obj->hdr_chunk > 0) {
4555 result = yaffs_rd_chunk_tags_nand(obj->my_dev,
4559 yaffs_load_name_from_oh(obj->my_dev, name, oh->name,
4562 yaffs_release_temp_buffer(obj->my_dev, buffer, __LINE__);
4565 yaffs_fix_null_name(obj, name, buffer_size);
4567 return yaffs_strnlen(name, YAFFS_MAX_NAME_LENGTH);
4570 int yaffs_get_obj_length(struct yaffs_obj *obj)
4572 /* Dereference any hard linking */
4573 obj = yaffs_get_equivalent_obj(obj);
4575 if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE)
4576 return obj->variant.file_variant.file_size;
4577 if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) {
4578 if (!obj->variant.symlink_variant.alias)
4580 return yaffs_strnlen(obj->variant.symlink_variant.alias,
4581 YAFFS_MAX_ALIAS_LENGTH);
4583 /* Only a directory should drop through to here */
4584 return obj->my_dev->data_bytes_per_chunk;
4588 int yaffs_get_obj_link_count(struct yaffs_obj *obj)
4591 struct list_head *i;
4594 count++; /* the object itself */
4596 list_for_each(i, &obj->hard_links)
4597 count++; /* add the hard links; */
4602 int yaffs_get_obj_inode(struct yaffs_obj *obj)
4604 obj = yaffs_get_equivalent_obj(obj);
4609 unsigned yaffs_get_obj_type(struct yaffs_obj *obj)
4611 obj = yaffs_get_equivalent_obj(obj);
4613 switch (obj->variant_type) {
4614 case YAFFS_OBJECT_TYPE_FILE:
4617 case YAFFS_OBJECT_TYPE_DIRECTORY:
4620 case YAFFS_OBJECT_TYPE_SYMLINK:
4623 case YAFFS_OBJECT_TYPE_HARDLINK:
4626 case YAFFS_OBJECT_TYPE_SPECIAL:
4627 if (S_ISFIFO(obj->yst_mode))
4629 if (S_ISCHR(obj->yst_mode))
4631 if (S_ISBLK(obj->yst_mode))
4633 if (S_ISSOCK(obj->yst_mode))
4641 YCHAR *yaffs_get_symlink_alias(struct yaffs_obj *obj)
4643 obj = yaffs_get_equivalent_obj(obj);
4644 if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK)
4645 return yaffs_clone_str(obj->variant.symlink_variant.alias);
4647 return yaffs_clone_str(_Y(""));
4650 static int yaffs_do_xattrib_mod(struct yaffs_obj *obj, int set,
4651 const YCHAR * name, const void *value, int size,
4654 struct yaffs_xattr_mod xmod;
4663 xmod.result = -ENOSPC;
4665 result = yaffs_update_oh(obj, NULL, 0, 0, 0, &xmod);
4673 static int yaffs_apply_xattrib_mod(struct yaffs_obj *obj, char *buffer,
4674 struct yaffs_xattr_mod *xmod)
4677 int x_offs = sizeof(struct yaffs_obj_hdr);
4678 struct yaffs_dev *dev = obj->my_dev;
4679 int x_size = dev->data_bytes_per_chunk - sizeof(struct yaffs_obj_hdr);
4681 char *x_buffer = buffer + x_offs;
4685 nval_set(x_buffer, x_size, xmod->name, xmod->data,
4686 xmod->size, xmod->flags);
4688 retval = nval_del(x_buffer, x_size, xmod->name);
4690 obj->has_xattr = nval_hasvalues(x_buffer, x_size);
4691 obj->xattr_known = 1;
4693 xmod->result = retval;
4698 static int yaffs_do_xattrib_fetch(struct yaffs_obj *obj, const YCHAR * name,
4699 void *value, int size)
4701 char *buffer = NULL;
4703 struct yaffs_ext_tags tags;
4704 struct yaffs_dev *dev = obj->my_dev;
4705 int x_offs = sizeof(struct yaffs_obj_hdr);
4706 int x_size = dev->data_bytes_per_chunk - sizeof(struct yaffs_obj_hdr);
4712 if (obj->hdr_chunk < 1)
4715 /* If we know that the object has no xattribs then don't do all the
4716 * reading and parsing.
4718 if (obj->xattr_known && !obj->has_xattr) {
4725 buffer = (char *)yaffs_get_temp_buffer(dev, __LINE__);
4730 yaffs_rd_chunk_tags_nand(dev, obj->hdr_chunk, (u8 *) buffer, &tags);
4732 if (result != YAFFS_OK)
4735 x_buffer = buffer + x_offs;
4737 if (!obj->xattr_known) {
4738 obj->has_xattr = nval_hasvalues(x_buffer, x_size);
4739 obj->xattr_known = 1;
4743 retval = nval_get(x_buffer, x_size, name, value, size);
4745 retval = nval_list(x_buffer, x_size, value, size);
4747 yaffs_release_temp_buffer(dev, (u8 *) buffer, __LINE__);
4751 int yaffs_set_xattrib(struct yaffs_obj *obj, const YCHAR * name,
4752 const void *value, int size, int flags)
4754 return yaffs_do_xattrib_mod(obj, 1, name, value, size, flags);
4757 int yaffs_remove_xattrib(struct yaffs_obj *obj, const YCHAR * name)
4759 return yaffs_do_xattrib_mod(obj, 0, name, NULL, 0, 0);
4762 int yaffs_get_xattrib(struct yaffs_obj *obj, const YCHAR * name, void *value,
4765 return yaffs_do_xattrib_fetch(obj, name, value, size);
4768 int yaffs_list_xattrib(struct yaffs_obj *obj, char *buffer, int size)
4770 return yaffs_do_xattrib_fetch(obj, NULL, buffer, size);
4773 /*---------------------------- Initialisation code -------------------------------------- */
4775 static int yaffs_check_dev_fns(const struct yaffs_dev *dev)
4778 /* Common functions, gotta have */
4779 if (!dev->param.erase_fn || !dev->param.initialise_flash_fn)
4782 #ifdef CONFIG_YAFFS_YAFFS2
4784 /* Can use the "with tags" style interface for yaffs1 or yaffs2 */
4785 if (dev->param.write_chunk_tags_fn &&
4786 dev->param.read_chunk_tags_fn &&
4787 !dev->param.write_chunk_fn &&
4788 !dev->param.read_chunk_fn &&
4789 dev->param.bad_block_fn && dev->param.query_block_fn)
4793 /* Can use the "spare" style interface for yaffs1 */
4794 if (!dev->param.is_yaffs2 &&
4795 !dev->param.write_chunk_tags_fn &&
4796 !dev->param.read_chunk_tags_fn &&
4797 dev->param.write_chunk_fn &&
4798 dev->param.read_chunk_fn &&
4799 !dev->param.bad_block_fn && !dev->param.query_block_fn)
4805 static int yaffs_create_initial_dir(struct yaffs_dev *dev)
4807 /* Initialise the unlinked, deleted, root and lost and found directories */
4809 dev->lost_n_found = dev->root_dir = NULL;
4810 dev->unlinked_dir = dev->del_dir = NULL;
4813 yaffs_create_fake_dir(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
4816 yaffs_create_fake_dir(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
4819 yaffs_create_fake_dir(dev, YAFFS_OBJECTID_ROOT,
4820 YAFFS_ROOT_MODE | S_IFDIR);
4822 yaffs_create_fake_dir(dev, YAFFS_OBJECTID_LOSTNFOUND,
4823 YAFFS_LOSTNFOUND_MODE | S_IFDIR);
4825 if (dev->lost_n_found && dev->root_dir && dev->unlinked_dir
4827 yaffs_add_obj_to_dir(dev->root_dir, dev->lost_n_found);
4834 int yaffs_guts_initialise(struct yaffs_dev *dev)
4836 int init_failed = 0;
4840 T(YAFFS_TRACE_TRACING,
4841 (TSTR("yaffs: yaffs_guts_initialise()" TENDSTR)));
4843 /* Check stuff that must be set */
4846 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Need a device" TENDSTR)));
4850 dev->internal_start_block = dev->param.start_block;
4851 dev->internal_end_block = dev->param.end_block;
4852 dev->block_offset = 0;
4853 dev->chunk_offset = 0;
4854 dev->n_free_chunks = 0;
4858 if (dev->param.start_block == 0) {
4859 dev->internal_start_block = dev->param.start_block + 1;
4860 dev->internal_end_block = dev->param.end_block + 1;
4861 dev->block_offset = 1;
4862 dev->chunk_offset = dev->param.chunks_per_block;
4865 /* Check geometry parameters. */
4867 if ((!dev->param.inband_tags && dev->param.is_yaffs2 && dev->param.total_bytes_per_chunk < 1024) || (!dev->param.is_yaffs2 && dev->param.total_bytes_per_chunk < 512) || (dev->param.inband_tags && !dev->param.is_yaffs2) || dev->param.chunks_per_block < 2 || dev->param.n_reserved_blocks < 2 || dev->internal_start_block <= 0 || dev->internal_end_block <= 0 || dev->internal_end_block <= (dev->internal_start_block + dev->param.n_reserved_blocks + 2)) { /* otherwise it is too small */
4868 T(YAFFS_TRACE_ALWAYS,
4870 ("yaffs: NAND geometry problems: chunk size %d, type is yaffs%s, inband_tags %d "
4871 TENDSTR), dev->param.total_bytes_per_chunk,
4872 dev->param.is_yaffs2 ? "2" : "", dev->param.inband_tags));
4876 if (yaffs_init_nand(dev) != YAFFS_OK) {
4877 T(YAFFS_TRACE_ALWAYS,
4878 (TSTR("yaffs: InitialiseNAND failed" TENDSTR)));
4882 /* Sort out space for inband tags, if required */
4883 if (dev->param.inband_tags)
4884 dev->data_bytes_per_chunk =
4885 dev->param.total_bytes_per_chunk -
4886 sizeof(struct yaffs_packed_tags2_tags_only);
4888 dev->data_bytes_per_chunk = dev->param.total_bytes_per_chunk;
4890 /* Got the right mix of functions? */
4891 if (!yaffs_check_dev_fns(dev)) {
4892 /* Function missing */
4893 T(YAFFS_TRACE_ALWAYS,
4895 ("yaffs: device function(s) missing or wrong\n" TENDSTR)));
4900 if (dev->is_mounted) {
4901 T(YAFFS_TRACE_ALWAYS,
4902 (TSTR("yaffs: device already mounted\n" TENDSTR)));
4906 /* Finished with most checks. One or two more checks happen later on too. */
4908 dev->is_mounted = 1;
4910 /* OK now calculate a few things for the device */
4913 * Calculate all the chunk size manipulation numbers:
4915 x = dev->data_bytes_per_chunk;
4916 /* We always use dev->chunk_shift and dev->chunk_div */
4917 dev->chunk_shift = calc_shifts(x);
4918 x >>= dev->chunk_shift;
4920 /* We only use chunk mask if chunk_div is 1 */
4921 dev->chunk_mask = (1 << dev->chunk_shift) - 1;
4924 * Calculate chunk_grp_bits.
4925 * We need to find the next power of 2 > than internal_end_block
4928 x = dev->param.chunks_per_block * (dev->internal_end_block + 1);
4930 bits = calc_shifts_ceiling(x);
4932 /* Set up tnode width if wide tnodes are enabled. */
4933 if (!dev->param.wide_tnodes_disabled) {
4934 /* bits must be even so that we end up with 32-bit words */
4938 dev->tnode_width = 16;
4940 dev->tnode_width = bits;
4942 dev->tnode_width = 16;
4945 dev->tnode_mask = (1 << dev->tnode_width) - 1;
4947 /* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
4948 * so if the bitwidth of the
4949 * chunk range we're using is greater than 16 we need
4950 * to figure out chunk shift and chunk_grp_size
4953 if (bits <= dev->tnode_width)
4954 dev->chunk_grp_bits = 0;
4956 dev->chunk_grp_bits = bits - dev->tnode_width;
4958 dev->tnode_size = (dev->tnode_width * YAFFS_NTNODES_LEVEL0) / 8;
4959 if (dev->tnode_size < sizeof(struct yaffs_tnode))
4960 dev->tnode_size = sizeof(struct yaffs_tnode);
4962 dev->chunk_grp_size = 1 << dev->chunk_grp_bits;
4964 if (dev->param.chunks_per_block < dev->chunk_grp_size) {
4965 /* We have a problem because the soft delete won't work if
4966 * the chunk group size > chunks per block.
4967 * This can be remedied by using larger "virtual blocks".
4969 T(YAFFS_TRACE_ALWAYS,
4970 (TSTR("yaffs: chunk group too large\n" TENDSTR)));
4975 /* OK, we've finished verifying the device, lets continue with initialisation */
4977 /* More device initialisation */
4979 dev->passive_gc_count = 0;
4980 dev->oldest_dirty_gc_count = 0;
4982 dev->gc_block_finder = 0;
4983 dev->buffered_block = -1;
4984 dev->doing_buffered_block_rewrite = 0;
4985 dev->n_deleted_files = 0;
4986 dev->n_bg_deletions = 0;
4987 dev->n_unlinked_files = 0;
4988 dev->n_ecc_fixed = 0;
4989 dev->n_ecc_unfixed = 0;
4990 dev->n_tags_ecc_fixed = 0;
4991 dev->n_tags_ecc_unfixed = 0;
4992 dev->n_erase_failures = 0;
4993 dev->n_erased_blocks = 0;
4994 dev->gc_disable = 0;
4995 dev->has_pending_prioritised_gc = 1; /* Assume the worst for now, will get fixed on first GC */
4996 INIT_LIST_HEAD(&dev->dirty_dirs);
4997 dev->oldest_dirty_seq = 0;
4998 dev->oldest_dirty_block = 0;
5000 /* Initialise temporary buffers and caches. */
5001 if (!yaffs_init_tmp_buffers(dev))
5005 dev->gc_cleanup_list = NULL;
5007 if (!init_failed && dev->param.n_caches > 0) {
5011 dev->param.n_caches * sizeof(struct yaffs_cache);
5013 if (dev->param.n_caches > YAFFS_MAX_SHORT_OP_CACHES)
5014 dev->param.n_caches = YAFFS_MAX_SHORT_OP_CACHES;
5016 dev->cache = YMALLOC(cache_bytes);
5018 buf = (u8 *) dev->cache;
5021 memset(dev->cache, 0, cache_bytes);
5023 for (i = 0; i < dev->param.n_caches && buf; i++) {
5024 dev->cache[i].object = NULL;
5025 dev->cache[i].last_use = 0;
5026 dev->cache[i].dirty = 0;
5027 dev->cache[i].data = buf =
5028 YMALLOC_DMA(dev->param.total_bytes_per_chunk);
5033 dev->cache_last_use = 0;
5036 dev->cache_hits = 0;
5039 dev->gc_cleanup_list =
5040 YMALLOC(dev->param.chunks_per_block * sizeof(u32));
5041 if (!dev->gc_cleanup_list)
5045 if (dev->param.is_yaffs2)
5046 dev->param.use_header_file_size = 1;
5048 if (!init_failed && !yaffs_init_blocks(dev))
5051 yaffs_init_tnodes_and_objs(dev);
5053 if (!init_failed && !yaffs_create_initial_dir(dev))
5057 /* Now scan the flash. */
5058 if (dev->param.is_yaffs2) {
5059 if (yaffs2_checkpt_restore(dev)) {
5060 yaffs_check_obj_details_loaded(dev->root_dir);
5061 T(YAFFS_TRACE_CHECKPOINT | YAFFS_TRACE_MOUNT,
5063 ("yaffs: restored from checkpoint"
5067 /* Clean up the mess caused by an aborted checkpoint load
5068 * and scan backwards.
5070 yaffs_deinit_blocks(dev);
5072 yaffs_deinit_tnodes_and_objs(dev);
5074 dev->n_erased_blocks = 0;
5075 dev->n_free_chunks = 0;
5076 dev->alloc_block = -1;
5077 dev->alloc_page = -1;
5078 dev->n_deleted_files = 0;
5079 dev->n_unlinked_files = 0;
5080 dev->n_bg_deletions = 0;
5082 if (!init_failed && !yaffs_init_blocks(dev))
5085 yaffs_init_tnodes_and_objs(dev);
5088 && !yaffs_create_initial_dir(dev))
5091 if (!init_failed && !yaffs2_scan_backwards(dev))
5094 } else if (!yaffs1_scan(dev)) {
5098 yaffs_strip_deleted_objs(dev);
5099 yaffs_fix_hanging_objs(dev);
5100 if (dev->param.empty_lost_n_found)
5101 yaffs_empty_l_n_f(dev);
5105 /* Clean up the mess */
5106 T(YAFFS_TRACE_TRACING,
5107 (TSTR("yaffs: yaffs_guts_initialise() aborted.\n" TENDSTR)));
5109 yaffs_deinitialise(dev);
5113 /* Zero out stats */
5114 dev->n_page_reads = 0;
5115 dev->n_page_writes = 0;
5116 dev->n_erasures = 0;
5117 dev->n_gc_copies = 0;
5118 dev->n_retired_writes = 0;
5120 dev->n_retired_blocks = 0;
5122 yaffs_verify_free_chunks(dev);
5123 yaffs_verify_blocks(dev);
5125 /* Clean up any aborted checkpoint data */
5126 if (!dev->is_checkpointed && dev->blocks_in_checkpt > 0)
5127 yaffs2_checkpt_invalidate(dev);
5129 T(YAFFS_TRACE_TRACING,
5130 (TSTR("yaffs: yaffs_guts_initialise() done.\n" TENDSTR)));
5135 void yaffs_deinitialise(struct yaffs_dev *dev)
5137 if (dev->is_mounted) {
5140 yaffs_deinit_blocks(dev);
5141 yaffs_deinit_tnodes_and_objs(dev);
5142 if (dev->param.n_caches > 0 && dev->cache) {
5144 for (i = 0; i < dev->param.n_caches; i++) {
5145 if (dev->cache[i].data)
5146 YFREE(dev->cache[i].data);
5147 dev->cache[i].data = NULL;
5154 YFREE(dev->gc_cleanup_list);
5156 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
5157 YFREE(dev->temp_buffer[i].buffer);
5159 dev->is_mounted = 0;
5161 if (dev->param.deinitialise_flash_fn)
5162 dev->param.deinitialise_flash_fn(dev);
5166 int yaffs_count_free_chunks(struct yaffs_dev *dev)
5171 struct yaffs_block_info *blk;
5173 blk = dev->block_info;
5174 for (b = dev->internal_start_block; b <= dev->internal_end_block; b++) {
5175 switch (blk->block_state) {
5176 case YAFFS_BLOCK_STATE_EMPTY:
5177 case YAFFS_BLOCK_STATE_ALLOCATING:
5178 case YAFFS_BLOCK_STATE_COLLECTING:
5179 case YAFFS_BLOCK_STATE_FULL:
5181 (dev->param.chunks_per_block - blk->pages_in_use +
5182 blk->soft_del_pages);
5193 int yaffs_get_n_free_chunks(struct yaffs_dev *dev)
5195 /* This is what we report to the outside world */
5199 int blocks_for_checkpt;
5202 n_free = dev->n_free_chunks;
5203 n_free += dev->n_deleted_files;
5205 /* Now count the number of dirty chunks in the cache and subtract those */
5207 for (n_dirty_caches = 0, i = 0; i < dev->param.n_caches; i++) {
5208 if (dev->cache[i].dirty)
5212 n_free -= n_dirty_caches;
5215 ((dev->param.n_reserved_blocks + 1) * dev->param.chunks_per_block);
5217 /* Now we figure out how much to reserve for the checkpoint and report that... */
5218 blocks_for_checkpt = yaffs_calc_checkpt_blocks_required(dev);
5220 n_free -= (blocks_for_checkpt * dev->param.chunks_per_block);