2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
4 * Copyright (C) 2002-2011 Aleph One Ltd.
5 * for Toby Churchill Ltd and Brightstar Engineering
7 * Created by Charles Manning <charles@aleph1.co.uk>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
14 #include "yaffs_guts.h"
15 #include "yaffs_trace.h"
16 #include "yaffs_yaffs2.h"
17 #include "yaffs_checkptrw.h"
18 #include "yaffs_bitmap.h"
19 #include "yaffs_nand.h"
20 #include "yaffs_getblockinfo.h"
21 #include "yaffs_verify.h"
22 #include "yaffs_attribs.h"
23 #include "yaffs_summary.h"
26 * Checkpoints are really no benefit on very small partitions.
28 * To save space on small partitions don't bother with checkpoints unless
29 * the partition is at least this big.
31 #define YAFFS_CHECKPOINT_MIN_BLOCKS 60
32 #define YAFFS_SMALL_HOLE_THRESHOLD 4
35 * Oldest Dirty Sequence Number handling.
38 /* yaffs_calc_oldest_dirty_seq()
39 * yaffs2_find_oldest_dirty_seq()
40 * Calculate the oldest dirty sequence number if we don't know it.
42 void yaffs_calc_oldest_dirty_seq(struct yaffs_dev *dev)
46 unsigned block_no = 0;
47 struct yaffs_block_info *b;
49 if (!dev->param.is_yaffs2)
52 /* Find the oldest dirty sequence number. */
53 seq = dev->seq_number + 1;
55 for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
56 if (b->block_state == YAFFS_BLOCK_STATE_FULL &&
57 (b->pages_in_use - b->soft_del_pages) <
58 dev->param.chunks_per_block &&
59 b->seq_number < seq) {
67 dev->oldest_dirty_seq = seq;
68 dev->oldest_dirty_block = block_no;
72 void yaffs2_find_oldest_dirty_seq(struct yaffs_dev *dev)
74 if (!dev->param.is_yaffs2)
77 if (!dev->oldest_dirty_seq)
78 yaffs_calc_oldest_dirty_seq(dev);
82 * yaffs_clear_oldest_dirty_seq()
83 * Called when a block is erased or marked bad. (ie. when its seq_number
84 * becomes invalid). If the value matches the oldest then we clear
85 * dev->oldest_dirty_seq to force its recomputation.
87 void yaffs2_clear_oldest_dirty_seq(struct yaffs_dev *dev,
88 struct yaffs_block_info *bi)
91 if (!dev->param.is_yaffs2)
94 if (!bi || bi->seq_number == dev->oldest_dirty_seq) {
95 dev->oldest_dirty_seq = 0;
96 dev->oldest_dirty_block = 0;
101 * yaffs2_update_oldest_dirty_seq()
102 * Update the oldest dirty sequence number whenever we dirty a block.
103 * Only do this if the oldest_dirty_seq is actually being tracked.
105 void yaffs2_update_oldest_dirty_seq(struct yaffs_dev *dev, unsigned block_no,
106 struct yaffs_block_info *bi)
108 if (!dev->param.is_yaffs2)
111 if (dev->oldest_dirty_seq) {
112 if (dev->oldest_dirty_seq > bi->seq_number) {
113 dev->oldest_dirty_seq = bi->seq_number;
114 dev->oldest_dirty_block = block_no;
119 int yaffs_block_ok_for_gc(struct yaffs_dev *dev, struct yaffs_block_info *bi)
122 if (!dev->param.is_yaffs2)
123 return 1; /* disqualification only applies to yaffs2. */
125 if (!bi->has_shrink_hdr)
126 return 1; /* can gc */
128 yaffs2_find_oldest_dirty_seq(dev);
130 /* Can't do gc of this block if there are any blocks older than this
131 * one that have discarded pages.
133 return (bi->seq_number <= dev->oldest_dirty_seq);
137 * yaffs2_find_refresh_block()
138 * periodically finds the oldest full block by sequence number for refreshing.
141 u32 yaffs2_find_refresh_block(struct yaffs_dev *dev)
146 struct yaffs_block_info *bi;
148 if (!dev->param.is_yaffs2)
152 * If refresh period < 10 then refreshing is disabled.
154 if (dev->param.refresh_period < 10)
160 if (dev->refresh_skip > dev->param.refresh_period)
161 dev->refresh_skip = dev->param.refresh_period;
163 if (dev->refresh_skip > 0)
167 * Refresh skip is now zero.
168 * We'll do a refresh this time around....
169 * Update the refresh skip and find the oldest block.
171 dev->refresh_skip = dev->param.refresh_period;
172 dev->refresh_count++;
173 bi = dev->block_info;
174 for (b = dev->internal_start_block; b <= dev->internal_end_block; b++) {
176 if (bi->block_state == YAFFS_BLOCK_STATE_FULL) {
178 if (oldest < 1 || bi->seq_number < oldest_seq) {
180 oldest_seq = bi->seq_number;
187 yaffs_trace(YAFFS_TRACE_GC,
188 "GC refresh count %d selected block %d with seq_number %d",
189 dev->refresh_count, oldest, oldest_seq);
195 int yaffs2_checkpt_required(struct yaffs_dev *dev)
199 if (!dev->param.is_yaffs2)
202 nblocks = dev->internal_end_block - dev->internal_start_block + 1;
204 return !dev->param.skip_checkpt_wr &&
205 !dev->read_only && (nblocks >= YAFFS_CHECKPOINT_MIN_BLOCKS);
208 int yaffs_calc_checkpt_blocks_required(struct yaffs_dev *dev)
215 if (!dev->param.is_yaffs2)
218 if (!dev->checkpoint_blocks_required && yaffs2_checkpt_required(dev)) {
219 /* Not a valid value so recalculate */
220 dev_blocks = dev->param.end_block - dev->param.start_block + 1;
221 n_bytes += sizeof(struct yaffs_checkpt_validity);
222 n_bytes += sizeof(struct yaffs_checkpt_dev);
223 n_bytes += dev_blocks * sizeof(struct yaffs_block_info);
224 n_bytes += dev_blocks * dev->chunk_bit_stride;
226 (sizeof(struct yaffs_checkpt_obj) + sizeof(u32)) *
228 n_bytes += (dev->tnode_size + sizeof(u32)) * dev->n_tnodes;
229 n_bytes += sizeof(struct yaffs_checkpt_validity);
230 n_bytes += sizeof(u32); /* checksum */
232 /* Round up and add 2 blocks to allow for some bad blocks,
237 (dev->data_bytes_per_chunk *
238 dev->param.chunks_per_block)) + 3;
240 dev->checkpoint_blocks_required = n_blocks;
243 retval = dev->checkpoint_blocks_required - dev->blocks_in_checkpt;
249 /*--------------------- Checkpointing --------------------*/
251 static int yaffs2_wr_checkpt_validity_marker(struct yaffs_dev *dev, int head)
253 struct yaffs_checkpt_validity cp;
255 memset(&cp, 0, sizeof(cp));
257 cp.struct_type = sizeof(cp);
258 cp.magic = YAFFS_MAGIC;
259 cp.version = YAFFS_CHECKPOINT_VERSION;
260 cp.head = (head) ? 1 : 0;
262 return (yaffs2_checkpt_wr(dev, &cp, sizeof(cp)) == sizeof(cp)) ? 1 : 0;
265 static int yaffs2_rd_checkpt_validity_marker(struct yaffs_dev *dev, int head)
267 struct yaffs_checkpt_validity cp;
270 ok = (yaffs2_checkpt_rd(dev, &cp, sizeof(cp)) == sizeof(cp));
273 ok = (cp.struct_type == sizeof(cp)) &&
274 (cp.magic == YAFFS_MAGIC) &&
275 (cp.version == YAFFS_CHECKPOINT_VERSION) &&
276 (cp.head == ((head) ? 1 : 0));
280 static void yaffs2_dev_to_checkpt_dev(struct yaffs_checkpt_dev *cp,
281 struct yaffs_dev *dev)
283 cp->n_erased_blocks = dev->n_erased_blocks;
284 cp->alloc_block = dev->alloc_block;
285 cp->alloc_page = dev->alloc_page;
286 cp->n_free_chunks = dev->n_free_chunks;
288 cp->n_deleted_files = dev->n_deleted_files;
289 cp->n_unlinked_files = dev->n_unlinked_files;
290 cp->n_bg_deletions = dev->n_bg_deletions;
291 cp->seq_number = dev->seq_number;
295 static void yaffs_checkpt_dev_to_dev(struct yaffs_dev *dev,
296 struct yaffs_checkpt_dev *cp)
298 dev->n_erased_blocks = cp->n_erased_blocks;
299 dev->alloc_block = cp->alloc_block;
300 dev->alloc_page = cp->alloc_page;
301 dev->n_free_chunks = cp->n_free_chunks;
303 dev->n_deleted_files = cp->n_deleted_files;
304 dev->n_unlinked_files = cp->n_unlinked_files;
305 dev->n_bg_deletions = cp->n_bg_deletions;
306 dev->seq_number = cp->seq_number;
309 static int yaffs2_wr_checkpt_dev(struct yaffs_dev *dev)
311 struct yaffs_checkpt_dev cp;
313 u32 n_blocks = dev->internal_end_block - dev->internal_start_block + 1;
316 /* Write device runtime values */
317 yaffs2_dev_to_checkpt_dev(&cp, dev);
318 cp.struct_type = sizeof(cp);
320 ok = (yaffs2_checkpt_wr(dev, &cp, sizeof(cp)) == sizeof(cp));
324 /* Write block info */
325 n_bytes = n_blocks * sizeof(struct yaffs_block_info);
326 ok = (yaffs2_checkpt_wr(dev, dev->block_info, n_bytes) == n_bytes);
330 /* Write chunk bits */
331 n_bytes = n_blocks * dev->chunk_bit_stride;
332 ok = (yaffs2_checkpt_wr(dev, dev->chunk_bits, n_bytes) == n_bytes);
337 static int yaffs2_rd_checkpt_dev(struct yaffs_dev *dev)
339 struct yaffs_checkpt_dev cp;
342 (dev->internal_end_block - dev->internal_start_block + 1);
345 ok = (yaffs2_checkpt_rd(dev, &cp, sizeof(cp)) == sizeof(cp));
349 if (cp.struct_type != sizeof(cp))
352 yaffs_checkpt_dev_to_dev(dev, &cp);
354 n_bytes = n_blocks * sizeof(struct yaffs_block_info);
356 ok = (yaffs2_checkpt_rd(dev, dev->block_info, n_bytes) == n_bytes);
361 n_bytes = n_blocks * dev->chunk_bit_stride;
363 ok = (yaffs2_checkpt_rd(dev, dev->chunk_bits, n_bytes) == n_bytes);
368 static void yaffs2_obj_checkpt_obj(struct yaffs_checkpt_obj *cp,
369 struct yaffs_obj *obj)
371 cp->obj_id = obj->obj_id;
372 cp->parent_id = (obj->parent) ? obj->parent->obj_id : 0;
373 cp->hdr_chunk = obj->hdr_chunk;
374 cp->variant_type = obj->variant_type;
375 cp->deleted = obj->deleted;
376 cp->soft_del = obj->soft_del;
377 cp->unlinked = obj->unlinked;
378 cp->fake = obj->fake;
379 cp->rename_allowed = obj->rename_allowed;
380 cp->unlink_allowed = obj->unlink_allowed;
381 cp->serial = obj->serial;
382 cp->n_data_chunks = obj->n_data_chunks;
384 if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE)
385 cp->size_or_equiv_obj = obj->variant.file_variant.file_size;
386 else if (obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK)
387 cp->size_or_equiv_obj = obj->variant.hardlink_variant.equiv_id;
390 static int yaffs2_checkpt_obj_to_obj(struct yaffs_obj *obj,
391 struct yaffs_checkpt_obj *cp)
393 struct yaffs_obj *parent;
395 if (obj->variant_type != cp->variant_type) {
396 yaffs_trace(YAFFS_TRACE_ERROR,
397 "Checkpoint read object %d type %d chunk %d does not match existing object type %d",
398 cp->obj_id, cp->variant_type, cp->hdr_chunk,
403 obj->obj_id = cp->obj_id;
406 parent = yaffs_find_or_create_by_number(obj->my_dev,
408 YAFFS_OBJECT_TYPE_DIRECTORY);
413 if (parent->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
414 yaffs_trace(YAFFS_TRACE_ALWAYS,
415 "Checkpoint read object %d parent %d type %d chunk %d Parent type, %d, not directory",
416 cp->obj_id, cp->parent_id,
417 cp->variant_type, cp->hdr_chunk,
418 parent->variant_type);
421 yaffs_add_obj_to_dir(parent, obj);
424 obj->hdr_chunk = cp->hdr_chunk;
425 obj->variant_type = cp->variant_type;
426 obj->deleted = cp->deleted;
427 obj->soft_del = cp->soft_del;
428 obj->unlinked = cp->unlinked;
429 obj->fake = cp->fake;
430 obj->rename_allowed = cp->rename_allowed;
431 obj->unlink_allowed = cp->unlink_allowed;
432 obj->serial = cp->serial;
433 obj->n_data_chunks = cp->n_data_chunks;
435 if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE) {
436 obj->variant.file_variant.file_size = cp->size_or_equiv_obj;
437 obj->variant.file_variant.stored_size = cp->size_or_equiv_obj;
438 } else if (obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) {
439 obj->variant.hardlink_variant.equiv_id = cp->size_or_equiv_obj;
441 if (obj->hdr_chunk > 0)
442 obj->lazy_loaded = 1;
446 static int yaffs2_checkpt_tnode_worker(struct yaffs_obj *in,
447 struct yaffs_tnode *tn, u32 level,
451 struct yaffs_dev *dev = in->my_dev;
459 for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++) {
460 if (!tn->internal[i])
462 ok = yaffs2_checkpt_tnode_worker(in,
466 YAFFS_TNODES_INTERNAL_BITS) + i);
472 base_offset = chunk_offset << YAFFS_TNODES_LEVEL0_BITS;
473 ok = (yaffs2_checkpt_wr(dev, &base_offset, sizeof(base_offset)) ==
474 sizeof(base_offset));
476 ok = (yaffs2_checkpt_wr(dev, tn, dev->tnode_size) ==
482 static int yaffs2_wr_checkpt_tnodes(struct yaffs_obj *obj)
487 if (obj->variant_type != YAFFS_OBJECT_TYPE_FILE)
490 ok = yaffs2_checkpt_tnode_worker(obj,
491 obj->variant.file_variant.top,
492 obj->variant.file_variant.
495 ok = (yaffs2_checkpt_wr(obj->my_dev, &end_marker,
496 sizeof(end_marker)) == sizeof(end_marker));
501 static int yaffs2_rd_checkpt_tnodes(struct yaffs_obj *obj)
505 struct yaffs_dev *dev = obj->my_dev;
506 struct yaffs_file_var *file_stuct_ptr = &obj->variant.file_variant;
507 struct yaffs_tnode *tn;
510 ok = (yaffs2_checkpt_rd(dev, &base_chunk, sizeof(base_chunk)) ==
513 while (ok && (~base_chunk)) {
515 /* Read level 0 tnode */
517 tn = yaffs_get_tnode(dev);
519 ok = (yaffs2_checkpt_rd(dev, tn, dev->tnode_size) ==
525 ok = yaffs_add_find_tnode_0(dev,
527 base_chunk, tn) ? 1 : 0;
530 ok = (yaffs2_checkpt_rd
532 sizeof(base_chunk)) == sizeof(base_chunk));
535 yaffs_trace(YAFFS_TRACE_CHECKPOINT,
536 "Checkpoint read tnodes %d records, last %d. ok %d",
537 nread, base_chunk, ok);
542 static int yaffs2_wr_checkpt_objs(struct yaffs_dev *dev)
544 struct yaffs_obj *obj;
545 struct yaffs_checkpt_obj cp;
548 struct list_head *lh;
550 /* Iterate through the objects in each hash entry,
551 * dumping them to the checkpointing stream.
554 for (i = 0; ok && i < YAFFS_NOBJECT_BUCKETS; i++) {
555 list_for_each(lh, &dev->obj_bucket[i].list) {
556 obj = list_entry(lh, struct yaffs_obj, hash_link);
557 if (!obj->defered_free) {
558 yaffs2_obj_checkpt_obj(&cp, obj);
559 cp.struct_type = sizeof(cp);
561 yaffs_trace(YAFFS_TRACE_CHECKPOINT,
562 "Checkpoint write object %d parent %d type %d chunk %d obj addr %p",
563 cp.obj_id, cp.parent_id,
564 cp.variant_type, cp.hdr_chunk, obj);
566 ok = (yaffs2_checkpt_wr(dev, &cp,
567 sizeof(cp)) == sizeof(cp));
571 YAFFS_OBJECT_TYPE_FILE)
572 ok = yaffs2_wr_checkpt_tnodes(obj);
577 /* Dump end of list */
578 memset(&cp, 0xff, sizeof(struct yaffs_checkpt_obj));
579 cp.struct_type = sizeof(cp);
582 ok = (yaffs2_checkpt_wr(dev, &cp, sizeof(cp)) == sizeof(cp));
587 static int yaffs2_rd_checkpt_objs(struct yaffs_dev *dev)
589 struct yaffs_obj *obj;
590 struct yaffs_checkpt_obj cp;
593 LIST_HEAD(hard_list);
596 while (ok && !done) {
597 ok = (yaffs2_checkpt_rd(dev, &cp, sizeof(cp)) == sizeof(cp));
598 if (cp.struct_type != sizeof(cp)) {
599 yaffs_trace(YAFFS_TRACE_CHECKPOINT,
600 "struct size %d instead of %d ok %d",
601 cp.struct_type, (int)sizeof(cp), ok);
605 yaffs_trace(YAFFS_TRACE_CHECKPOINT,
606 "Checkpoint read object %d parent %d type %d chunk %d ",
607 cp.obj_id, cp.parent_id, cp.variant_type,
610 if (ok && cp.obj_id == ~0) {
614 yaffs_find_or_create_by_number(dev, cp.obj_id,
617 ok = yaffs2_checkpt_obj_to_obj(obj, &cp);
620 if (obj->variant_type ==
621 YAFFS_OBJECT_TYPE_FILE) {
622 ok = yaffs2_rd_checkpt_tnodes(obj);
623 } else if (obj->variant_type ==
624 YAFFS_OBJECT_TYPE_HARDLINK) {
625 list_add(&obj->hard_links, &hard_list);
634 yaffs_link_fixup(dev, &hard_list);
639 static int yaffs2_wr_checkpt_sum(struct yaffs_dev *dev)
644 yaffs2_get_checkpt_sum(dev, &checkpt_sum);
646 ok = (yaffs2_checkpt_wr(dev, &checkpt_sum, sizeof(checkpt_sum)) ==
647 sizeof(checkpt_sum));
655 static int yaffs2_rd_checkpt_sum(struct yaffs_dev *dev)
661 yaffs2_get_checkpt_sum(dev, &checkpt_sum0);
663 ok = (yaffs2_checkpt_rd(dev, &checkpt_sum1, sizeof(checkpt_sum1)) ==
664 sizeof(checkpt_sum1));
669 if (checkpt_sum0 != checkpt_sum1)
675 static int yaffs2_wr_checkpt_data(struct yaffs_dev *dev)
679 if (!yaffs2_checkpt_required(dev)) {
680 yaffs_trace(YAFFS_TRACE_CHECKPOINT,
681 "skipping checkpoint write");
686 ok = yaffs2_checkpt_open(dev, 1);
689 yaffs_trace(YAFFS_TRACE_CHECKPOINT,
690 "write checkpoint validity");
691 ok = yaffs2_wr_checkpt_validity_marker(dev, 1);
694 yaffs_trace(YAFFS_TRACE_CHECKPOINT,
695 "write checkpoint device");
696 ok = yaffs2_wr_checkpt_dev(dev);
699 yaffs_trace(YAFFS_TRACE_CHECKPOINT,
700 "write checkpoint objects");
701 ok = yaffs2_wr_checkpt_objs(dev);
704 yaffs_trace(YAFFS_TRACE_CHECKPOINT,
705 "write checkpoint validity");
706 ok = yaffs2_wr_checkpt_validity_marker(dev, 0);
710 ok = yaffs2_wr_checkpt_sum(dev);
712 if (!yaffs_checkpt_close(dev))
716 dev->is_checkpointed = 1;
718 dev->is_checkpointed = 0;
720 return dev->is_checkpointed;
723 static int yaffs2_rd_checkpt_data(struct yaffs_dev *dev)
727 if (!dev->param.is_yaffs2)
730 if (ok && dev->param.skip_checkpt_rd) {
731 yaffs_trace(YAFFS_TRACE_CHECKPOINT,
732 "skipping checkpoint read");
737 ok = yaffs2_checkpt_open(dev, 0); /* open for read */
740 yaffs_trace(YAFFS_TRACE_CHECKPOINT,
741 "read checkpoint validity");
742 ok = yaffs2_rd_checkpt_validity_marker(dev, 1);
745 yaffs_trace(YAFFS_TRACE_CHECKPOINT,
746 "read checkpoint device");
747 ok = yaffs2_rd_checkpt_dev(dev);
750 yaffs_trace(YAFFS_TRACE_CHECKPOINT,
751 "read checkpoint objects");
752 ok = yaffs2_rd_checkpt_objs(dev);
755 yaffs_trace(YAFFS_TRACE_CHECKPOINT,
756 "read checkpoint validity");
757 ok = yaffs2_rd_checkpt_validity_marker(dev, 0);
761 ok = yaffs2_rd_checkpt_sum(dev);
762 yaffs_trace(YAFFS_TRACE_CHECKPOINT,
763 "read checkpoint checksum %d", ok);
766 if (!yaffs_checkpt_close(dev))
770 dev->is_checkpointed = 1;
772 dev->is_checkpointed = 0;
777 void yaffs2_checkpt_invalidate(struct yaffs_dev *dev)
779 if (dev->is_checkpointed || dev->blocks_in_checkpt > 0) {
780 dev->is_checkpointed = 0;
781 yaffs2_checkpt_invalidate_stream(dev);
783 if (dev->param.sb_dirty_fn)
784 dev->param.sb_dirty_fn(dev);
787 int yaffs_checkpoint_save(struct yaffs_dev *dev)
789 yaffs_trace(YAFFS_TRACE_CHECKPOINT,
790 "save entry: is_checkpointed %d",
791 dev->is_checkpointed);
793 yaffs_verify_objects(dev);
794 yaffs_verify_blocks(dev);
795 yaffs_verify_free_chunks(dev);
797 if (!dev->is_checkpointed) {
798 yaffs2_checkpt_invalidate(dev);
799 yaffs2_wr_checkpt_data(dev);
802 yaffs_trace(YAFFS_TRACE_CHECKPOINT | YAFFS_TRACE_MOUNT,
803 "save exit: is_checkpointed %d",
804 dev->is_checkpointed);
806 return dev->is_checkpointed;
809 int yaffs2_checkpt_restore(struct yaffs_dev *dev)
813 yaffs_trace(YAFFS_TRACE_CHECKPOINT,
814 "restore entry: is_checkpointed %d",
815 dev->is_checkpointed);
817 retval = yaffs2_rd_checkpt_data(dev);
819 if (dev->is_checkpointed) {
820 yaffs_verify_objects(dev);
821 yaffs_verify_blocks(dev);
822 yaffs_verify_free_chunks(dev);
825 yaffs_trace(YAFFS_TRACE_CHECKPOINT,
826 "restore exit: is_checkpointed %d",
827 dev->is_checkpointed);
832 int yaffs2_handle_hole(struct yaffs_obj *obj, loff_t new_size)
834 /* if new_size > old_file_size.
835 * We're going to be writing a hole.
836 * If the hole is small then write zeros otherwise write a start
839 loff_t old_file_size;
842 int result = YAFFS_OK;
843 struct yaffs_dev *dev = NULL;
844 u8 *local_buffer = NULL;
845 int small_increase_ok = 0;
850 if (obj->variant_type != YAFFS_OBJECT_TYPE_FILE)
855 /* Bail out if not yaffs2 mode */
856 if (!dev->param.is_yaffs2)
859 old_file_size = obj->variant.file_variant.file_size;
861 if (new_size <= old_file_size)
864 increase = new_size - old_file_size;
866 if (increase < YAFFS_SMALL_HOLE_THRESHOLD * dev->data_bytes_per_chunk &&
867 yaffs_check_alloc_available(dev, YAFFS_SMALL_HOLE_THRESHOLD + 1))
873 local_buffer = yaffs_get_temp_buffer(dev);
876 /* fill hole with zero bytes */
877 loff_t pos = old_file_size;
880 memset(local_buffer, 0, dev->data_bytes_per_chunk);
881 small_increase_ok = 1;
883 while (increase > 0 && small_increase_ok) {
884 this_write = increase;
885 if (this_write > dev->data_bytes_per_chunk)
886 this_write = dev->data_bytes_per_chunk;
888 yaffs_do_file_wr(obj, local_buffer, pos, this_write,
890 if (written == this_write) {
892 increase -= this_write;
894 small_increase_ok = 0;
898 yaffs_release_temp_buffer(dev, local_buffer);
900 /* If out of space then reverse any chunks we've added */
901 if (!small_increase_ok)
902 yaffs_resize_file_down(obj, old_file_size);
905 if (!small_increase_ok &&
907 obj->parent->obj_id != YAFFS_OBJECTID_UNLINKED &&
908 obj->parent->obj_id != YAFFS_OBJECTID_DELETED) {
909 /* Write a hole start header with the old file size */
910 yaffs_update_oh(obj, NULL, 0, 1, 0, NULL);
916 struct yaffs_block_index {
921 static int yaffs2_ybicmp(const void *a, const void *b)
923 int aseq = ((struct yaffs_block_index *)a)->seq;
924 int bseq = ((struct yaffs_block_index *)b)->seq;
925 int ablock = ((struct yaffs_block_index *)a)->block;
926 int bblock = ((struct yaffs_block_index *)b)->block;
929 return ablock - bblock;
934 static inline int yaffs2_scan_chunk(struct yaffs_dev *dev,
935 struct yaffs_block_info *bi,
936 int blk, int chunk_in_block,
939 struct list_head *hard_list,
940 int summary_available)
942 struct yaffs_obj_hdr *oh;
943 struct yaffs_obj *in;
944 struct yaffs_obj *parent;
949 struct yaffs_ext_tags tags;
951 int alloc_failed = 0;
952 int chunk = blk * dev->param.chunks_per_block + chunk_in_block;
953 struct yaffs_file_var *file_var;
954 struct yaffs_hardlink_var *hl_var;
955 struct yaffs_symlink_var *sl_var;
957 if (summary_available) {
958 result = yaffs_summary_fetch(dev, &tags, chunk_in_block);
959 tags.seq_number = bi->seq_number;
962 if (!summary_available || tags.obj_id == 0) {
963 result = yaffs_rd_chunk_tags_nand(dev, chunk, NULL, &tags);
969 /* Let's have a good look at this chunk... */
971 if (!tags.chunk_used) {
972 /* An unassigned chunk in the block.
973 * If there are used chunks after this one, then
974 * it is a chunk that was skipped due to failing
975 * the erased check. Just skip it so that it can
977 * But, more typically, We get here when this is
978 * an unallocated chunk and his means that
979 * either the block is empty or this is the one
980 * being allocated from
984 /* This is a chunk that was skipped due
985 * to failing the erased check */
986 } else if (chunk_in_block == 0) {
987 /* We're looking at the first chunk in
988 * the block so the block is unused */
989 bi->block_state = YAFFS_BLOCK_STATE_EMPTY;
990 dev->n_erased_blocks++;
992 if (bi->block_state == YAFFS_BLOCK_STATE_NEEDS_SCAN ||
993 bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING) {
994 if (dev->seq_number == bi->seq_number) {
995 /* Allocating from this block*/
996 yaffs_trace(YAFFS_TRACE_SCAN,
997 " Allocating from %d %d",
998 blk, chunk_in_block);
1001 YAFFS_BLOCK_STATE_ALLOCATING;
1002 dev->alloc_block = blk;
1003 dev->alloc_page = chunk_in_block;
1004 dev->alloc_block_finder = blk;
1006 /* This is a partially written block
1007 * that is not the current
1010 yaffs_trace(YAFFS_TRACE_SCAN,
1011 "Partially written block %d detected. gc will fix this.",
1017 dev->n_free_chunks++;
1019 } else if (tags.ecc_result ==
1020 YAFFS_ECC_RESULT_UNFIXED) {
1021 yaffs_trace(YAFFS_TRACE_SCAN,
1022 " Unfixed ECC in chunk(%d:%d), chunk ignored",
1023 blk, chunk_in_block);
1024 dev->n_free_chunks++;
1025 } else if (tags.obj_id > YAFFS_MAX_OBJECT_ID ||
1026 tags.chunk_id > YAFFS_MAX_CHUNK_ID ||
1027 tags.obj_id == YAFFS_OBJECTID_SUMMARY ||
1028 (tags.chunk_id > 0 &&
1029 tags.n_bytes > dev->data_bytes_per_chunk) ||
1030 tags.seq_number != bi->seq_number) {
1031 yaffs_trace(YAFFS_TRACE_SCAN,
1032 "Chunk (%d:%d) with bad tags:obj = %d, chunk_id = %d, n_bytes = %d, ignored",
1033 blk, chunk_in_block, tags.obj_id,
1034 tags.chunk_id, tags.n_bytes);
1035 dev->n_free_chunks++;
1036 } else if (tags.chunk_id > 0) {
1037 /* chunk_id > 0 so it is a data chunk... */
1039 loff_t chunk_base = (tags.chunk_id - 1) *
1040 dev->data_bytes_per_chunk;
1044 yaffs_set_chunk_bit(dev, blk, chunk_in_block);
1047 in = yaffs_find_or_create_by_number(dev,
1049 YAFFS_OBJECT_TYPE_FILE);
1055 in->variant_type == YAFFS_OBJECT_TYPE_FILE &&
1056 chunk_base < in->variant.file_variant.shrink_size) {
1057 /* This has not been invalidated by
1059 if (!yaffs_put_chunk_in_file(in, tags.chunk_id,
1063 /* File size is calculated by looking at
1064 * the data chunks if we have not
1065 * seen an object header yet.
1066 * Stop this practice once we find an
1069 endpos = chunk_base + tags.n_bytes;
1072 in->variant.file_variant.stored_size < endpos) {
1073 in->variant.file_variant.
1074 stored_size = endpos;
1075 in->variant.file_variant.
1079 /* This chunk has been invalidated by a
1080 * resize, or a past file deletion
1081 * so delete the chunk*/
1082 yaffs_chunk_del(dev, chunk, 1, __LINE__);
1085 /* chunk_id == 0, so it is an ObjectHeader.
1086 * Thus, we read in the object header and make
1091 yaffs_set_chunk_bit(dev, blk, chunk_in_block);
1097 if (tags.extra_available) {
1098 in = yaffs_find_or_create_by_number(dev,
1100 tags.extra_obj_type);
1106 (!in->valid && dev->param.disable_lazy_load) ||
1107 tags.extra_shadows ||
1108 (!in->valid && (tags.obj_id == YAFFS_OBJECTID_ROOT ||
1109 tags.obj_id == YAFFS_OBJECTID_LOSTNFOUND))) {
1111 /* If we don't have valid info then we
1112 * need to read the chunk
1113 * TODO In future we can probably defer
1114 * reading the chunk and living with
1115 * invalid data until needed.
1118 result = yaffs_rd_chunk_tags_nand(dev,
1123 oh = (struct yaffs_obj_hdr *)chunk_data;
1125 if (dev->param.inband_tags) {
1126 /* Fix up the header if they got
1127 * corrupted by inband tags */
1129 oh->inband_shadowed_obj_id;
1131 oh->inband_is_shrink;
1135 in = yaffs_find_or_create_by_number(dev,
1136 tags.obj_id, oh->type);
1143 /* TODO Hoosterman we have a problem! */
1144 yaffs_trace(YAFFS_TRACE_ERROR,
1145 "yaffs tragedy: Could not make object for object %d at chunk %d during scan",
1146 tags.obj_id, chunk);
1151 /* We have already filled this one.
1152 * We have a duplicate that will be
1153 * discarded, but we first have to suck
1154 * out resize info if it is a file.
1156 if ((in->variant_type == YAFFS_OBJECT_TYPE_FILE) &&
1157 ((oh && oh->type == YAFFS_OBJECT_TYPE_FILE) ||
1158 (tags.extra_available &&
1159 tags.extra_obj_type == YAFFS_OBJECT_TYPE_FILE)
1161 loff_t this_size = (oh) ?
1162 yaffs_oh_to_size(oh) :
1163 tags.extra_file_size;
1164 u32 parent_obj_id = (oh) ?
1166 tags.extra_parent_id;
1170 tags.extra_is_shrink;
1172 /* If it is deleted (unlinked
1173 * at start also means deleted)
1174 * we treat the file size as
1175 * being zeroed at this point.
1177 if (parent_obj_id == YAFFS_OBJECTID_DELETED ||
1178 parent_obj_id == YAFFS_OBJECTID_UNLINKED) {
1184 in->variant.file_variant.shrink_size >
1186 in->variant.file_variant.shrink_size =
1190 bi->has_shrink_hdr = 1;
1192 /* Use existing - destroy this one. */
1193 yaffs_chunk_del(dev, chunk, 1, __LINE__);
1196 if (!in->valid && in->variant_type !=
1197 (oh ? oh->type : tags.extra_obj_type)) {
1198 yaffs_trace(YAFFS_TRACE_ERROR,
1199 "yaffs tragedy: Bad type, %d != %d, for object %d at chunk %d during scan",
1200 oh ? oh->type : tags.extra_obj_type,
1201 in->variant_type, tags.obj_id,
1203 in = yaffs_retype_obj(in, oh ? oh->type : tags.extra_obj_type);
1207 (tags.obj_id == YAFFS_OBJECTID_ROOT ||
1208 tags.obj_id == YAFFS_OBJECTID_LOSTNFOUND)) {
1209 /* We only load some info, don't fiddle
1210 * with directory structure */
1214 in->yst_mode = oh->yst_mode;
1215 yaffs_load_attribs(in, oh);
1216 in->lazy_loaded = 0;
1218 in->lazy_loaded = 1;
1220 in->hdr_chunk = chunk;
1222 } else if (!in->valid) {
1223 /* we need to load this info */
1225 in->hdr_chunk = chunk;
1227 in->variant_type = oh->type;
1228 in->yst_mode = oh->yst_mode;
1229 yaffs_load_attribs(in, oh);
1231 if (oh->shadows_obj > 0)
1232 yaffs_handle_shadowed_obj(dev,
1233 oh->shadows_obj, 1);
1235 yaffs_set_obj_name_from_oh(in, oh);
1236 parent = yaffs_find_or_create_by_number(dev,
1238 YAFFS_OBJECT_TYPE_DIRECTORY);
1239 file_size = yaffs_oh_to_size(oh);
1240 is_shrink = oh->is_shrink;
1241 equiv_id = oh->equiv_id;
1243 in->variant_type = tags.extra_obj_type;
1244 parent = yaffs_find_or_create_by_number(dev,
1245 tags.extra_parent_id,
1246 YAFFS_OBJECT_TYPE_DIRECTORY);
1247 file_size = tags.extra_file_size;
1248 is_shrink = tags.extra_is_shrink;
1249 equiv_id = tags.extra_equiv_id;
1250 in->lazy_loaded = 1;
1257 /* directory stuff...
1262 parent->variant_type == YAFFS_OBJECT_TYPE_UNKNOWN) {
1263 /* Set up as a directory */
1264 parent->variant_type =
1265 YAFFS_OBJECT_TYPE_DIRECTORY;
1266 INIT_LIST_HEAD(&parent->
1267 variant.dir_variant.children);
1268 } else if (!parent ||
1269 parent->variant_type !=
1270 YAFFS_OBJECT_TYPE_DIRECTORY) {
1271 /* Hoosterman, another problem....
1272 * Trying to use a non-directory as a directory
1275 yaffs_trace(YAFFS_TRACE_ERROR,
1276 "yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
1278 parent = dev->lost_n_found;
1280 yaffs_add_obj_to_dir(parent, in);
1282 is_unlinked = (parent == dev->del_dir) ||
1283 (parent == dev->unlinked_dir);
1286 /* Mark the block */
1287 bi->has_shrink_hdr = 1;
1289 /* Note re hardlinks.
1290 * Since we might scan a hardlink before its equivalent
1291 * object is scanned we put them all in a list.
1292 * After scanning is complete, we should have all the
1293 * objects, so we run through this list and fix up all
1297 switch (in->variant_type) {
1298 case YAFFS_OBJECT_TYPE_UNKNOWN:
1299 /* Todo got a problem */
1301 case YAFFS_OBJECT_TYPE_FILE:
1302 file_var = &in->variant.file_variant;
1303 if (file_var->stored_size < file_size) {
1304 /* This covers the case where the file
1305 * size is greater than the data held.
1306 * This will happen if the file is
1307 * resized to be larger than its
1308 * current data extents.
1310 file_var->file_size = file_size;
1311 file_var->stored_size = file_size;
1314 if (file_var->shrink_size > file_size)
1315 file_var->shrink_size = file_size;
1318 case YAFFS_OBJECT_TYPE_HARDLINK:
1319 hl_var = &in->variant.hardlink_variant;
1321 hl_var->equiv_id = equiv_id;
1322 list_add(&in->hard_links, hard_list);
1325 case YAFFS_OBJECT_TYPE_DIRECTORY:
1328 case YAFFS_OBJECT_TYPE_SPECIAL:
1331 case YAFFS_OBJECT_TYPE_SYMLINK:
1332 sl_var = &in->variant.symlink_variant;
1335 yaffs_clone_str(oh->alias);
1343 return alloc_failed ? YAFFS_FAIL : YAFFS_OK;
1346 int yaffs2_scan_backwards(struct yaffs_dev *dev)
1353 enum yaffs_block_state state;
1355 LIST_HEAD(hard_list);
1356 struct yaffs_block_info *bi;
1358 int n_blocks = dev->internal_end_block - dev->internal_start_block + 1;
1361 int alloc_failed = 0;
1362 struct yaffs_block_index *block_index = NULL;
1363 int alt_block_index = 0;
1364 int summary_available;
1366 yaffs_trace(YAFFS_TRACE_SCAN,
1367 "yaffs2_scan_backwards starts intstartblk %d intendblk %d...",
1368 dev->internal_start_block, dev->internal_end_block);
1370 dev->seq_number = YAFFS_LOWEST_SEQUENCE_NUMBER;
1373 kmalloc(n_blocks * sizeof(struct yaffs_block_index), GFP_NOFS);
1377 vmalloc(n_blocks * sizeof(struct yaffs_block_index));
1378 alt_block_index = 1;
1382 yaffs_trace(YAFFS_TRACE_SCAN,
1383 "yaffs2_scan_backwards() could not allocate block index!"
1388 dev->blocks_in_checkpt = 0;
1390 chunk_data = yaffs_get_temp_buffer(dev);
1392 /* Scan all the blocks to determine their state */
1393 bi = dev->block_info;
1394 for (blk = dev->internal_start_block; blk <= dev->internal_end_block;
1396 yaffs_clear_chunk_bits(dev, blk);
1397 bi->pages_in_use = 0;
1398 bi->soft_del_pages = 0;
1400 yaffs_query_init_block_state(dev, blk, &state, &seq_number);
1402 bi->block_state = state;
1403 bi->seq_number = seq_number;
1405 if (bi->seq_number == YAFFS_SEQUENCE_CHECKPOINT_DATA)
1406 bi->block_state = YAFFS_BLOCK_STATE_CHECKPOINT;
1407 if (bi->seq_number == YAFFS_SEQUENCE_BAD_BLOCK)
1408 bi->block_state = YAFFS_BLOCK_STATE_DEAD;
1410 yaffs_trace(YAFFS_TRACE_SCAN_DEBUG,
1411 "Block scanning block %d state %d seq %d",
1412 blk, bi->block_state, seq_number);
1414 if (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT) {
1415 dev->blocks_in_checkpt++;
1417 } else if (bi->block_state == YAFFS_BLOCK_STATE_DEAD) {
1418 yaffs_trace(YAFFS_TRACE_BAD_BLOCKS,
1419 "block %d is bad", blk);
1420 } else if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) {
1421 yaffs_trace(YAFFS_TRACE_SCAN_DEBUG, "Block empty ");
1422 dev->n_erased_blocks++;
1423 dev->n_free_chunks += dev->param.chunks_per_block;
1424 } else if (bi->block_state ==
1425 YAFFS_BLOCK_STATE_NEEDS_SCAN) {
1426 /* Determine the highest sequence number */
1427 if (seq_number >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
1428 seq_number < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
1429 block_index[n_to_scan].seq = seq_number;
1430 block_index[n_to_scan].block = blk;
1432 if (seq_number >= dev->seq_number)
1433 dev->seq_number = seq_number;
1435 /* TODO: Nasty sequence number! */
1436 yaffs_trace(YAFFS_TRACE_SCAN,
1437 "Block scanning block %d has bad sequence number %d",
1444 yaffs_trace(YAFFS_TRACE_ALWAYS, "%d blocks to be sorted...", n_to_scan);
1448 /* Sort the blocks by sequence number */
1449 sort(block_index, n_to_scan, sizeof(struct yaffs_block_index),
1450 yaffs2_ybicmp, NULL);
1454 yaffs_trace(YAFFS_TRACE_SCAN, "...done");
1456 /* Now scan the blocks looking at the data. */
1458 end_iter = n_to_scan - 1;
1459 yaffs_trace(YAFFS_TRACE_SCAN_DEBUG, "%d blocks to scan", n_to_scan);
1461 /* For each block.... backwards */
1462 for (block_iter = end_iter;
1463 !alloc_failed && block_iter >= start_iter;
1465 /* Cooperative multitasking! This loop can run for so
1466 long that watchdog timers expire. */
1469 /* get the block to scan in the correct order */
1470 blk = block_index[block_iter].block;
1471 bi = yaffs_get_block_info(dev, blk);
1473 summary_available = yaffs_summary_read(dev, dev->sum_tags, blk);
1475 /* For each chunk in each block that needs scanning.... */
1477 if (summary_available)
1478 c = dev->chunks_per_summary - 1;
1480 c = dev->param.chunks_per_block - 1;
1482 for (/* c is already initialised */;
1483 !alloc_failed && c >= 0 &&
1484 (bi->block_state == YAFFS_BLOCK_STATE_NEEDS_SCAN ||
1485 bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING);
1487 /* Scan backwards...
1488 * Read the tags and decide what to do
1490 if (yaffs2_scan_chunk(dev, bi, blk, c,
1491 &found_chunks, chunk_data,
1492 &hard_list, summary_available) ==
1497 if (bi->block_state == YAFFS_BLOCK_STATE_NEEDS_SCAN) {
1498 /* If we got this far while scanning, then the block
1499 * is fully allocated. */
1500 bi->block_state = YAFFS_BLOCK_STATE_FULL;
1503 /* Now let's see if it was dirty */
1504 if (bi->pages_in_use == 0 &&
1505 !bi->has_shrink_hdr &&
1506 bi->block_state == YAFFS_BLOCK_STATE_FULL) {
1507 yaffs_block_became_dirty(dev, blk);
1511 yaffs_skip_rest_of_block(dev);
1513 if (alt_block_index)
1518 /* Ok, we've done all the scanning.
1519 * Fix up the hard link chains.
1520 * We have scanned all the objects, now it's time to add these
1523 yaffs_link_fixup(dev, &hard_list);
1525 yaffs_release_temp_buffer(dev, chunk_data);
1530 yaffs_trace(YAFFS_TRACE_SCAN, "yaffs2_scan_backwards ends");