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.
15
#include "yaffs_trace.h"
17
#include "yaffs_guts.h"
18
#include "yaffs_getblockinfo.h"
19
#include "yaffs_tagscompat.h"
20
#include "yaffs_nand.h"
21
#include "yaffs_yaffs1.h"
22
#include "yaffs_yaffs2.h"
23
#include "yaffs_bitmap.h"
24
#include "yaffs_verify.h"
25
#include "yaffs_nand.h"
26
#include "yaffs_packedtags2.h"
27
#include "yaffs_nameval.h"
28
#include "yaffs_allocator.h"
29
#include "yaffs_attribs.h"
30
#include "yaffs_summary.h"
32
/* Note YAFFS_GC_GOOD_ENOUGH must be <= YAFFS_GC_PASSIVE_THRESHOLD */
33
#define YAFFS_GC_GOOD_ENOUGH 2
34
#define YAFFS_GC_PASSIVE_THRESHOLD 4
36
#include "yaffs_ecc.h"
38
/* Forward declarations */
40
static int yaffs_wr_data_obj(struct yaffs_obj *in, int inode_chunk,
41
const u8 *buffer, int n_bytes, int use_reserve);
45
/* Function to calculate chunk and offset */
47
void yaffs_addr_to_chunk(struct yaffs_dev *dev, loff_t addr,
48
int *chunk_out, u32 *offset_out)
53
chunk = (u32) (addr >> dev->chunk_shift);
55
if (dev->chunk_div == 1) {
56
/* easy power of 2 case */
57
offset = (u32) (addr & dev->chunk_mask);
59
/* Non power-of-2 case */
63
chunk /= dev->chunk_div;
65
chunk_base = ((loff_t) chunk) * dev->data_bytes_per_chunk;
66
offset = (u32) (addr - chunk_base);
73
/* Function to return the number of shifts for a power of 2 greater than or
74
* equal to the given number
75
* Note we don't try to cater for all possible numbers and this does not have to
76
* be hellishly efficient.
79
static inline u32 calc_shifts_ceiling(u32 x)
84
shifts = extra_bits = 0;
99
/* Function to return the number of shifts to get a 1 in bit 0
102
static inline u32 calc_shifts(u32 x)
120
* Temporary buffer manipulations.
123
static int yaffs_init_tmp_buffers(struct yaffs_dev *dev)
128
memset(dev->temp_buffer, 0, sizeof(dev->temp_buffer));
130
for (i = 0; buf && i < YAFFS_N_TEMP_BUFFERS; i++) {
131
dev->temp_buffer[i].in_use = 0;
132
buf = kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS);
133
dev->temp_buffer[i].buffer = buf;
136
return buf ? YAFFS_OK : YAFFS_FAIL;
139
u8 *yaffs_get_temp_buffer(struct yaffs_dev * dev)
144
if (dev->temp_in_use > dev->max_temp)
145
dev->max_temp = dev->temp_in_use;
147
for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
148
if (dev->temp_buffer[i].in_use == 0) {
149
dev->temp_buffer[i].in_use = 1;
150
return dev->temp_buffer[i].buffer;
154
yaffs_trace(YAFFS_TRACE_BUFFERS, "Out of temp buffers");
156
* If we got here then we have to allocate an unmanaged one
160
dev->unmanaged_buffer_allocs++;
161
return kmalloc(dev->data_bytes_per_chunk, GFP_NOFS);
165
void yaffs_release_temp_buffer(struct yaffs_dev *dev, u8 *buffer)
171
for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
172
if (dev->temp_buffer[i].buffer == buffer) {
173
dev->temp_buffer[i].in_use = 0;
179
/* assume it is an unmanaged one. */
180
yaffs_trace(YAFFS_TRACE_BUFFERS,
181
"Releasing unmanaged temp buffer");
183
dev->unmanaged_buffer_deallocs++;
189
* Determine if we have a managed buffer.
191
int yaffs_is_managed_tmp_buffer(struct yaffs_dev *dev, const u8 *buffer)
195
for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
196
if (dev->temp_buffer[i].buffer == buffer)
200
for (i = 0; i < dev->param.n_caches; i++) {
201
if (dev->cache[i].data == buffer)
205
if (buffer == dev->checkpt_buffer)
208
yaffs_trace(YAFFS_TRACE_ALWAYS,
209
"yaffs: unmaged buffer detected.");
214
* Functions for robustisizing TODO
218
static void yaffs_handle_chunk_wr_ok(struct yaffs_dev *dev, int nand_chunk,
220
const struct yaffs_ext_tags *tags)
223
nand_chunk = nand_chunk;
228
static void yaffs_handle_chunk_update(struct yaffs_dev *dev, int nand_chunk,
229
const struct yaffs_ext_tags *tags)
232
nand_chunk = nand_chunk;
236
void yaffs_handle_chunk_error(struct yaffs_dev *dev,
237
struct yaffs_block_info *bi)
239
if (!bi->gc_prioritise) {
240
bi->gc_prioritise = 1;
241
dev->has_pending_prioritised_gc = 1;
242
bi->chunk_error_strikes++;
244
if (bi->chunk_error_strikes > 3) {
245
bi->needs_retiring = 1; /* Too many stikes, so retire */
246
yaffs_trace(YAFFS_TRACE_ALWAYS,
247
"yaffs: Block struck out");
253
static void yaffs_handle_chunk_wr_error(struct yaffs_dev *dev, int nand_chunk,
256
int flash_block = nand_chunk / dev->param.chunks_per_block;
257
struct yaffs_block_info *bi = yaffs_get_block_info(dev, flash_block);
259
yaffs_handle_chunk_error(dev, bi);
262
/* Was an actual write failure,
263
* so mark the block for retirement.*/
264
bi->needs_retiring = 1;
265
yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
266
"**>> Block %d needs retiring", flash_block);
269
/* Delete the chunk */
270
yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
271
yaffs_skip_rest_of_block(dev);
279
* Simple hash function. Needs to have a reasonable spread
282
static inline int yaffs_hash_fn(int n)
286
return n % YAFFS_NOBJECT_BUCKETS;
290
* Access functions to useful fake objects.
291
* Note that root might have a presence in NAND if permissions are set.
294
struct yaffs_obj *yaffs_root(struct yaffs_dev *dev)
296
return dev->root_dir;
299
struct yaffs_obj *yaffs_lost_n_found(struct yaffs_dev *dev)
301
return dev->lost_n_found;
305
* Erased NAND checking functions
308
int yaffs_check_ff(u8 *buffer, int n_bytes)
310
/* Horrible, slow implementation */
319
static int yaffs_check_chunk_erased(struct yaffs_dev *dev, int nand_chunk)
321
int retval = YAFFS_OK;
322
u8 *data = yaffs_get_temp_buffer(dev);
323
struct yaffs_ext_tags tags;
325
yaffs_rd_chunk_tags_nand(dev, nand_chunk, data, &tags);
327
if (tags.ecc_result > YAFFS_ECC_RESULT_NO_ERROR)
330
if (!yaffs_check_ff(data, dev->data_bytes_per_chunk) ||
332
yaffs_trace(YAFFS_TRACE_NANDACCESS,
333
"Chunk %d not erased", nand_chunk);
337
yaffs_release_temp_buffer(dev, data);
343
static int yaffs_verify_chunk_written(struct yaffs_dev *dev,
346
struct yaffs_ext_tags *tags)
348
int retval = YAFFS_OK;
349
struct yaffs_ext_tags temp_tags;
350
u8 *buffer = yaffs_get_temp_buffer(dev);
352
yaffs_rd_chunk_tags_nand(dev, nand_chunk, buffer, &temp_tags);
353
if (memcmp(buffer, data, dev->data_bytes_per_chunk) ||
354
temp_tags.obj_id != tags->obj_id ||
355
temp_tags.chunk_id != tags->chunk_id ||
356
temp_tags.n_bytes != tags->n_bytes)
359
yaffs_release_temp_buffer(dev, buffer);
365
int yaffs_check_alloc_available(struct yaffs_dev *dev, int n_chunks)
368
int reserved_blocks = dev->param.n_reserved_blocks;
371
checkpt_blocks = yaffs_calc_checkpt_blocks_required(dev);
374
(reserved_blocks + checkpt_blocks) * dev->param.chunks_per_block;
376
return (dev->n_free_chunks > (reserved_chunks + n_chunks));
379
static int yaffs_find_alloc_block(struct yaffs_dev *dev)
382
struct yaffs_block_info *bi;
384
if (dev->n_erased_blocks < 1) {
385
/* Hoosterman we've got a problem.
386
* Can't get space to gc
388
yaffs_trace(YAFFS_TRACE_ERROR,
389
"yaffs tragedy: no more erased blocks");
394
/* Find an empty block. */
396
for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
397
dev->alloc_block_finder++;
398
if (dev->alloc_block_finder < dev->internal_start_block
399
|| dev->alloc_block_finder > dev->internal_end_block) {
400
dev->alloc_block_finder = dev->internal_start_block;
403
bi = yaffs_get_block_info(dev, dev->alloc_block_finder);
405
if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) {
406
bi->block_state = YAFFS_BLOCK_STATE_ALLOCATING;
408
bi->seq_number = dev->seq_number;
409
dev->n_erased_blocks--;
410
yaffs_trace(YAFFS_TRACE_ALLOCATE,
411
"Allocated block %d, seq %d, %d left" ,
412
dev->alloc_block_finder, dev->seq_number,
413
dev->n_erased_blocks);
414
return dev->alloc_block_finder;
418
yaffs_trace(YAFFS_TRACE_ALWAYS,
419
"yaffs tragedy: no more erased blocks, but there should have been %d",
420
dev->n_erased_blocks);
425
static int yaffs_alloc_chunk(struct yaffs_dev *dev, int use_reserver,
426
struct yaffs_block_info **block_ptr)
429
struct yaffs_block_info *bi;
431
if (dev->alloc_block < 0) {
432
/* Get next block to allocate off */
433
dev->alloc_block = yaffs_find_alloc_block(dev);
437
if (!use_reserver && !yaffs_check_alloc_available(dev, 1)) {
438
/* No space unless we're allowed to use the reserve. */
442
if (dev->n_erased_blocks < dev->param.n_reserved_blocks
443
&& dev->alloc_page == 0)
444
yaffs_trace(YAFFS_TRACE_ALLOCATE, "Allocating reserve");
446
/* Next page please.... */
447
if (dev->alloc_block >= 0) {
448
bi = yaffs_get_block_info(dev, dev->alloc_block);
450
ret_val = (dev->alloc_block * dev->param.chunks_per_block) +
453
yaffs_set_chunk_bit(dev, dev->alloc_block, dev->alloc_page);
457
dev->n_free_chunks--;
459
/* If the block is full set the state to full */
460
if (dev->alloc_page >= dev->param.chunks_per_block) {
461
bi->block_state = YAFFS_BLOCK_STATE_FULL;
462
dev->alloc_block = -1;
471
yaffs_trace(YAFFS_TRACE_ERROR,
472
"!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!");
477
static int yaffs_get_erased_chunks(struct yaffs_dev *dev)
481
n = dev->n_erased_blocks * dev->param.chunks_per_block;
483
if (dev->alloc_block > 0)
484
n += (dev->param.chunks_per_block - dev->alloc_page);
491
* yaffs_skip_rest_of_block() skips over the rest of the allocation block
492
* if we don't want to write to it.
494
void yaffs_skip_rest_of_block(struct yaffs_dev *dev)
496
struct yaffs_block_info *bi;
498
if (dev->alloc_block > 0) {
499
bi = yaffs_get_block_info(dev, dev->alloc_block);
500
if (bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING) {
501
bi->block_state = YAFFS_BLOCK_STATE_FULL;
502
dev->alloc_block = -1;
507
static int yaffs_write_new_chunk(struct yaffs_dev *dev,
509
struct yaffs_ext_tags *tags, int use_reserver)
515
yaffs2_checkpt_invalidate(dev);
518
struct yaffs_block_info *bi = 0;
521
chunk = yaffs_alloc_chunk(dev, use_reserver, &bi);
527
/* First check this chunk is erased, if it needs
528
* checking. The checking policy (unless forced
529
* always on) is as follows:
531
* Check the first page we try to write in a block.
532
* If the check passes then we don't need to check any
533
* more. If the check fails, we check again...
534
* If the block has been erased, we don't need to check.
536
* However, if the block has been prioritised for gc,
537
* then we think there might be something odd about
538
* this block and stop using it.
540
* Rationale: We should only ever see chunks that have
541
* not been erased if there was a partially written
542
* chunk due to power loss. This checking policy should
543
* catch that case with very few checks and thus save a
544
* lot of checks that are most likely not needed.
547
* If an erase check fails or the write fails we skip the
551
/* let's give it a try */
554
if (dev->param.always_check_erased)
555
bi->skip_erased_check = 0;
557
if (!bi->skip_erased_check) {
558
erased_ok = yaffs_check_chunk_erased(dev, chunk);
559
if (erased_ok != YAFFS_OK) {
560
yaffs_trace(YAFFS_TRACE_ERROR,
561
"**>> yaffs chunk %d was not erased",
564
/* If not erased, delete this one,
565
* skip rest of block and
566
* try another chunk */
567
yaffs_chunk_del(dev, chunk, 1, __LINE__);
568
yaffs_skip_rest_of_block(dev);
573
write_ok = yaffs_wr_chunk_tags_nand(dev, chunk, data, tags);
575
if (!bi->skip_erased_check)
577
yaffs_verify_chunk_written(dev, chunk, data, tags);
579
if (write_ok != YAFFS_OK) {
580
/* Clean up aborted write, skip to next block and
581
* try another chunk */
582
yaffs_handle_chunk_wr_error(dev, chunk, erased_ok);
586
bi->skip_erased_check = 1;
588
/* Copy the data into the robustification buffer */
589
yaffs_handle_chunk_wr_ok(dev, chunk, data, tags);
591
} while (write_ok != YAFFS_OK &&
592
(yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts));
598
yaffs_trace(YAFFS_TRACE_ERROR,
599
"**>> yaffs write required %d attempts",
601
dev->n_retried_writes += (attempts - 1);
608
* Block retiring for handling a broken block.
611
static void yaffs_retire_block(struct yaffs_dev *dev, int flash_block)
613
struct yaffs_block_info *bi = yaffs_get_block_info(dev, flash_block);
615
yaffs2_checkpt_invalidate(dev);
617
yaffs2_clear_oldest_dirty_seq(dev, bi);
619
if (yaffs_mark_bad(dev, flash_block) != YAFFS_OK) {
620
if (yaffs_erase_block(dev, flash_block) != YAFFS_OK) {
621
yaffs_trace(YAFFS_TRACE_ALWAYS,
622
"yaffs: Failed to mark bad and erase block %d",
625
struct yaffs_ext_tags tags;
627
flash_block * dev->param.chunks_per_block;
629
u8 *buffer = yaffs_get_temp_buffer(dev);
631
memset(buffer, 0xff, dev->data_bytes_per_chunk);
632
memset(&tags, 0, sizeof(tags));
633
tags.seq_number = YAFFS_SEQUENCE_BAD_BLOCK;
634
if (dev->param.write_chunk_tags_fn(dev, chunk_id -
638
yaffs_trace(YAFFS_TRACE_ALWAYS,
639
"yaffs: Failed to write bad block marker to block %d",
642
yaffs_release_temp_buffer(dev, buffer);
646
bi->block_state = YAFFS_BLOCK_STATE_DEAD;
647
bi->gc_prioritise = 0;
648
bi->needs_retiring = 0;
650
dev->n_retired_blocks++;
653
/*---------------- Name handling functions ------------*/
655
static u16 yaffs_calc_name_sum(const YCHAR *name)
663
while ((*name) && i < (YAFFS_MAX_NAME_LENGTH / 2)) {
665
/* 0x1f mask is case insensitive */
666
sum += ((*name) & 0x1f) * i;
673
void yaffs_set_obj_name(struct yaffs_obj *obj, const YCHAR * name)
675
memset(obj->short_name, 0, sizeof(obj->short_name));
677
yaffs_strnlen(name, YAFFS_SHORT_NAME_LENGTH + 1) <=
678
YAFFS_SHORT_NAME_LENGTH)
679
yaffs_strcpy(obj->short_name, name);
681
obj->short_name[0] = _Y('\0');
682
obj->sum = yaffs_calc_name_sum(name);
685
void yaffs_set_obj_name_from_oh(struct yaffs_obj *obj,
686
const struct yaffs_obj_hdr *oh)
688
#ifdef CONFIG_YAFFS_AUTO_UNICODE
689
YCHAR tmp_name[YAFFS_MAX_NAME_LENGTH + 1];
690
memset(tmp_name, 0, sizeof(tmp_name));
691
yaffs_load_name_from_oh(obj->my_dev, tmp_name, oh->name,
692
YAFFS_MAX_NAME_LENGTH + 1);
693
yaffs_set_obj_name(obj, tmp_name);
695
yaffs_set_obj_name(obj, oh->name);
699
loff_t yaffs_max_file_size(struct yaffs_dev *dev)
701
return ((loff_t) YAFFS_MAX_CHUNK_ID) * dev->data_bytes_per_chunk;
704
/*-------------------- TNODES -------------------
706
* List of spare tnodes
707
* The list is hooked together using the first pointer
711
struct yaffs_tnode *yaffs_get_tnode(struct yaffs_dev *dev)
713
struct yaffs_tnode *tn = yaffs_alloc_raw_tnode(dev);
716
memset(tn, 0, dev->tnode_size);
720
dev->checkpoint_blocks_required = 0; /* force recalculation */
725
/* FreeTnode frees up a tnode and puts it back on the free list */
726
static void yaffs_free_tnode(struct yaffs_dev *dev, struct yaffs_tnode *tn)
728
yaffs_free_raw_tnode(dev, tn);
730
dev->checkpoint_blocks_required = 0; /* force recalculation */
733
static void yaffs_deinit_tnodes_and_objs(struct yaffs_dev *dev)
735
yaffs_deinit_raw_tnodes_and_objs(dev);
740
void yaffs_load_tnode_0(struct yaffs_dev *dev, struct yaffs_tnode *tn,
741
unsigned pos, unsigned val)
743
u32 *map = (u32 *) tn;
749
pos &= YAFFS_TNODES_LEVEL0_MASK;
750
val >>= dev->chunk_grp_bits;
752
bit_in_map = pos * dev->tnode_width;
753
word_in_map = bit_in_map / 32;
754
bit_in_word = bit_in_map & (32 - 1);
756
mask = dev->tnode_mask << bit_in_word;
758
map[word_in_map] &= ~mask;
759
map[word_in_map] |= (mask & (val << bit_in_word));
761
if (dev->tnode_width > (32 - bit_in_word)) {
762
bit_in_word = (32 - bit_in_word);
765
dev->tnode_mask >> bit_in_word;
766
map[word_in_map] &= ~mask;
767
map[word_in_map] |= (mask & (val >> bit_in_word));
771
u32 yaffs_get_group_base(struct yaffs_dev *dev, struct yaffs_tnode *tn,
774
u32 *map = (u32 *) tn;
780
pos &= YAFFS_TNODES_LEVEL0_MASK;
782
bit_in_map = pos * dev->tnode_width;
783
word_in_map = bit_in_map / 32;
784
bit_in_word = bit_in_map & (32 - 1);
786
val = map[word_in_map] >> bit_in_word;
788
if (dev->tnode_width > (32 - bit_in_word)) {
789
bit_in_word = (32 - bit_in_word);
791
val |= (map[word_in_map] << bit_in_word);
794
val &= dev->tnode_mask;
795
val <<= dev->chunk_grp_bits;
800
/* ------------------- End of individual tnode manipulation -----------------*/
802
/* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
803
* The look up tree is represented by the top tnode and the number of top_level
804
* in the tree. 0 means only the level 0 tnode is in the tree.
807
/* FindLevel0Tnode finds the level 0 tnode, if one exists. */
808
struct yaffs_tnode *yaffs_find_tnode_0(struct yaffs_dev *dev,
809
struct yaffs_file_var *file_struct,
812
struct yaffs_tnode *tn = file_struct->top;
815
int level = file_struct->top_level;
819
/* Check sane level and chunk Id */
820
if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL)
823
if (chunk_id > YAFFS_MAX_CHUNK_ID)
826
/* First check we're tall enough (ie enough top_level) */
828
i = chunk_id >> YAFFS_TNODES_LEVEL0_BITS;
831
i >>= YAFFS_TNODES_INTERNAL_BITS;
835
if (required_depth > file_struct->top_level)
836
return NULL; /* Not tall enough, so we can't find it */
838
/* Traverse down to level 0 */
839
while (level > 0 && tn) {
840
tn = tn->internal[(chunk_id >>
841
(YAFFS_TNODES_LEVEL0_BITS +
843
YAFFS_TNODES_INTERNAL_BITS)) &
844
YAFFS_TNODES_INTERNAL_MASK];
851
/* add_find_tnode_0 finds the level 0 tnode if it exists,
852
* otherwise first expands the tree.
853
* This happens in two steps:
854
* 1. If the tree isn't tall enough, then make it taller.
855
* 2. Scan down the tree towards the level 0 tnode adding tnodes if required.
857
* Used when modifying the tree.
859
* If the tn argument is NULL, then a fresh tnode will be added otherwise the
860
* specified tn will be plugged into the ttree.
863
struct yaffs_tnode *yaffs_add_find_tnode_0(struct yaffs_dev *dev,
864
struct yaffs_file_var *file_struct,
866
struct yaffs_tnode *passed_tn)
871
struct yaffs_tnode *tn;
874
/* Check sane level and page Id */
875
if (file_struct->top_level < 0 ||
876
file_struct->top_level > YAFFS_TNODES_MAX_LEVEL)
879
if (chunk_id > YAFFS_MAX_CHUNK_ID)
882
/* First check we're tall enough (ie enough top_level) */
884
x = chunk_id >> YAFFS_TNODES_LEVEL0_BITS;
887
x >>= YAFFS_TNODES_INTERNAL_BITS;
891
if (required_depth > file_struct->top_level) {
892
/* Not tall enough, gotta make the tree taller */
893
for (i = file_struct->top_level; i < required_depth; i++) {
895
tn = yaffs_get_tnode(dev);
898
tn->internal[0] = file_struct->top;
899
file_struct->top = tn;
900
file_struct->top_level++;
902
yaffs_trace(YAFFS_TRACE_ERROR,
903
"yaffs: no more tnodes");
909
/* Traverse down to level 0, adding anything we need */
911
l = file_struct->top_level;
912
tn = file_struct->top;
915
while (l > 0 && tn) {
917
(YAFFS_TNODES_LEVEL0_BITS +
918
(l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
919
YAFFS_TNODES_INTERNAL_MASK;
921
if ((l > 1) && !tn->internal[x]) {
922
/* Add missing non-level-zero tnode */
923
tn->internal[x] = yaffs_get_tnode(dev);
924
if (!tn->internal[x])
927
/* Looking from level 1 at level 0 */
929
/* If we already have one, release it */
931
yaffs_free_tnode(dev,
933
tn->internal[x] = passed_tn;
935
} else if (!tn->internal[x]) {
936
/* Don't have one, none passed in */
937
tn->internal[x] = yaffs_get_tnode(dev);
938
if (!tn->internal[x])
943
tn = tn->internal[x];
949
memcpy(tn, passed_tn,
950
(dev->tnode_width * YAFFS_NTNODES_LEVEL0) / 8);
951
yaffs_free_tnode(dev, passed_tn);
958
static int yaffs_tags_match(const struct yaffs_ext_tags *tags, int obj_id,
961
return (tags->chunk_id == chunk_obj &&
962
tags->obj_id == obj_id &&
963
!tags->is_deleted) ? 1 : 0;
967
static int yaffs_find_chunk_in_group(struct yaffs_dev *dev, int the_chunk,
968
struct yaffs_ext_tags *tags, int obj_id,
973
for (j = 0; the_chunk && j < dev->chunk_grp_size; j++) {
974
if (yaffs_check_chunk_bit
975
(dev, the_chunk / dev->param.chunks_per_block,
976
the_chunk % dev->param.chunks_per_block)) {
978
if (dev->chunk_grp_size == 1)
981
yaffs_rd_chunk_tags_nand(dev, the_chunk, NULL,
983
if (yaffs_tags_match(tags,
984
obj_id, inode_chunk)) {
995
static int yaffs_find_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
996
struct yaffs_ext_tags *tags)
998
/*Get the Tnode, then get the level 0 offset chunk offset */
999
struct yaffs_tnode *tn;
1001
struct yaffs_ext_tags local_tags;
1003
struct yaffs_dev *dev = in->my_dev;
1006
/* Passed a NULL, so use our own tags space */
1010
tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk);
1015
the_chunk = yaffs_get_group_base(dev, tn, inode_chunk);
1017
ret_val = yaffs_find_chunk_in_group(dev, the_chunk, tags, in->obj_id,
1022
static int yaffs_find_del_file_chunk(struct yaffs_obj *in, int inode_chunk,
1023
struct yaffs_ext_tags *tags)
1025
/* Get the Tnode, then get the level 0 offset chunk offset */
1026
struct yaffs_tnode *tn;
1028
struct yaffs_ext_tags local_tags;
1029
struct yaffs_dev *dev = in->my_dev;
1033
/* Passed a NULL, so use our own tags space */
1037
tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk);
1042
the_chunk = yaffs_get_group_base(dev, tn, inode_chunk);
1044
ret_val = yaffs_find_chunk_in_group(dev, the_chunk, tags, in->obj_id,
1047
/* Delete the entry in the filestructure (if found) */
1049
yaffs_load_tnode_0(dev, tn, inode_chunk, 0);
1054
int yaffs_put_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
1055
int nand_chunk, int in_scan)
1057
/* NB in_scan is zero unless scanning.
1058
* For forward scanning, in_scan is > 0;
1059
* for backward scanning in_scan is < 0
1061
* nand_chunk = 0 is a dummy insert to make sure the tnodes are there.
1064
struct yaffs_tnode *tn;
1065
struct yaffs_dev *dev = in->my_dev;
1067
struct yaffs_ext_tags existing_tags;
1068
struct yaffs_ext_tags new_tags;
1069
unsigned existing_serial, new_serial;
1071
if (in->variant_type != YAFFS_OBJECT_TYPE_FILE) {
1072
/* Just ignore an attempt at putting a chunk into a non-file
1074
* If it is not during Scanning then something went wrong!
1077
yaffs_trace(YAFFS_TRACE_ERROR,
1078
"yaffs tragedy:attempt to put data chunk into a non-file"
1083
yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
1087
tn = yaffs_add_find_tnode_0(dev,
1088
&in->variant.file_variant,
1094
/* Dummy insert, bail now */
1097
existing_cunk = yaffs_get_group_base(dev, tn, inode_chunk);
1100
/* If we're scanning then we need to test for duplicates
1101
* NB This does not need to be efficient since it should only
1102
* happen when the power fails during a write, then only one
1103
* chunk should ever be affected.
1105
* Correction for YAFFS2: This could happen quite a lot and we
1106
* need to think about efficiency! TODO
1107
* Update: For backward scanning we don't need to re-read tags
1108
* so this is quite cheap.
1111
if (existing_cunk > 0) {
1112
/* NB Right now existing chunk will not be real
1113
* chunk_id if the chunk group size > 1
1114
* thus we have to do a FindChunkInFile to get the
1117
* We have a duplicate now we need to decide which
1120
* Backwards scanning YAFFS2: The old one is what
1121
* we use, dump the new one.
1122
* YAFFS1: Get both sets of tags and compare serial
1127
/* Only do this for forward scanning */
1128
yaffs_rd_chunk_tags_nand(dev,
1132
/* Do a proper find */
1134
yaffs_find_chunk_in_file(in, inode_chunk,
1138
if (existing_cunk <= 0) {
1139
/*Hoosterman - how did this happen? */
1141
yaffs_trace(YAFFS_TRACE_ERROR,
1142
"yaffs tragedy: existing chunk < 0 in scan"
1147
/* NB The deleted flags should be false, otherwise
1148
* the chunks will not be loaded during a scan
1152
new_serial = new_tags.serial_number;
1153
existing_serial = existing_tags.serial_number;
1156
if ((in_scan > 0) &&
1157
(existing_cunk <= 0 ||
1158
((existing_serial + 1) & 3) == new_serial)) {
1159
/* Forward scanning.
1161
* Delete the old one and drop through to
1164
yaffs_chunk_del(dev, existing_cunk, 1,
1167
/* Backward scanning or we want to use the
1169
* Delete the new one and return early so that
1170
* the tnode isn't changed
1172
yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
1179
if (existing_cunk == 0)
1180
in->n_data_chunks++;
1182
yaffs_load_tnode_0(dev, tn, inode_chunk, nand_chunk);
1187
static void yaffs_soft_del_chunk(struct yaffs_dev *dev, int chunk)
1189
struct yaffs_block_info *the_block;
1192
yaffs_trace(YAFFS_TRACE_DELETION, "soft delete chunk %d", chunk);
1194
block_no = chunk / dev->param.chunks_per_block;
1195
the_block = yaffs_get_block_info(dev, block_no);
1197
the_block->soft_del_pages++;
1198
dev->n_free_chunks++;
1199
yaffs2_update_oldest_dirty_seq(dev, block_no, the_block);
1203
/* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all
1204
* the chunks in the file.
1205
* All soft deleting does is increment the block's softdelete count and pulls
1206
* the chunk out of the tnode.
1207
* Thus, essentially this is the same as DeleteWorker except that the chunks
1211
static int yaffs_soft_del_worker(struct yaffs_obj *in, struct yaffs_tnode *tn,
1212
u32 level, int chunk_offset)
1217
struct yaffs_dev *dev = in->my_dev;
1223
for (i = YAFFS_NTNODES_INTERNAL - 1;
1226
if (tn->internal[i]) {
1228
yaffs_soft_del_worker(in,
1232
YAFFS_TNODES_INTERNAL_BITS)
1235
yaffs_free_tnode(dev,
1237
tn->internal[i] = NULL;
1239
/* Can this happen? */
1243
return (all_done) ? 1 : 0;
1247
for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
1248
the_chunk = yaffs_get_group_base(dev, tn, i);
1250
yaffs_soft_del_chunk(dev, the_chunk);
1251
yaffs_load_tnode_0(dev, tn, i, 0);
1257
static void yaffs_remove_obj_from_dir(struct yaffs_obj *obj)
1259
struct yaffs_dev *dev = obj->my_dev;
1260
struct yaffs_obj *parent;
1262
yaffs_verify_obj_in_dir(obj);
1263
parent = obj->parent;
1265
yaffs_verify_dir(parent);
1267
if (dev && dev->param.remove_obj_fn)
1268
dev->param.remove_obj_fn(obj);
1270
list_del_init(&obj->siblings);
1273
yaffs_verify_dir(parent);
1276
void yaffs_add_obj_to_dir(struct yaffs_obj *directory, struct yaffs_obj *obj)
1279
yaffs_trace(YAFFS_TRACE_ALWAYS,
1280
"tragedy: Trying to add an object to a null pointer directory"
1285
if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
1286
yaffs_trace(YAFFS_TRACE_ALWAYS,
1287
"tragedy: Trying to add an object to a non-directory"
1292
if (obj->siblings.prev == NULL) {
1293
/* Not initialised */
1297
yaffs_verify_dir(directory);
1299
yaffs_remove_obj_from_dir(obj);
1302
list_add(&obj->siblings, &directory->variant.dir_variant.children);
1303
obj->parent = directory;
1305
if (directory == obj->my_dev->unlinked_dir
1306
|| directory == obj->my_dev->del_dir) {
1308
obj->my_dev->n_unlinked_files++;
1309
obj->rename_allowed = 0;
1312
yaffs_verify_dir(directory);
1313
yaffs_verify_obj_in_dir(obj);
1316
static int yaffs_change_obj_name(struct yaffs_obj *obj,
1317
struct yaffs_obj *new_dir,
1318
const YCHAR *new_name, int force, int shadows)
1322
struct yaffs_obj *existing_target;
1324
if (new_dir == NULL)
1325
new_dir = obj->parent; /* use the old directory */
1327
if (new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
1328
yaffs_trace(YAFFS_TRACE_ALWAYS,
1329
"tragedy: yaffs_change_obj_name: new_dir is not a directory"
1334
unlink_op = (new_dir == obj->my_dev->unlinked_dir);
1335
del_op = (new_dir == obj->my_dev->del_dir);
1337
existing_target = yaffs_find_by_name(new_dir, new_name);
1339
/* If the object is a file going into the unlinked directory,
1340
* then it is OK to just stuff it in since duplicate names are OK.
1341
* else only proceed if the new name does not exist and we're putting
1342
* it into a directory.
1344
if (!(unlink_op || del_op || force ||
1345
shadows > 0 || !existing_target) ||
1346
new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
1349
yaffs_set_obj_name(obj, new_name);
1351
yaffs_add_obj_to_dir(new_dir, obj);
1356
/* If it is a deletion then we mark it as a shrink for gc */
1357
if (yaffs_update_oh(obj, new_name, 0, del_op, shadows, NULL) >= 0)
1363
/*------------------------ Short Operations Cache ------------------------------
1364
* In many situations where there is no high level buffering a lot of
1365
* reads might be short sequential reads, and a lot of writes may be short
1366
* sequential writes. eg. scanning/writing a jpeg file.
1367
* In these cases, a short read/write cache can provide a huge perfomance
1368
* benefit with dumb-as-a-rock code.
1369
* In Linux, the page cache provides read buffering and the short op cache
1370
* provides write buffering.
1372
* There are a small number (~10) of cache chunks per device so that we don't
1373
* need a very intelligent search.
1376
static int yaffs_obj_cache_dirty(struct yaffs_obj *obj)
1378
struct yaffs_dev *dev = obj->my_dev;
1380
struct yaffs_cache *cache;
1381
int n_caches = obj->my_dev->param.n_caches;
1383
for (i = 0; i < n_caches; i++) {
1384
cache = &dev->cache[i];
1385
if (cache->object == obj && cache->dirty)
1392
static void yaffs_flush_file_cache(struct yaffs_obj *obj)
1394
struct yaffs_dev *dev = obj->my_dev;
1395
int lowest = -99; /* Stop compiler whining. */
1397
struct yaffs_cache *cache;
1398
int chunk_written = 0;
1399
int n_caches = obj->my_dev->param.n_caches;
1406
/* Find the lowest dirty chunk for this object */
1407
for (i = 0; i < n_caches; i++) {
1408
if (dev->cache[i].object == obj &&
1409
dev->cache[i].dirty) {
1411
dev->cache[i].chunk_id < lowest) {
1412
cache = &dev->cache[i];
1413
lowest = cache->chunk_id;
1418
if (cache && !cache->locked) {
1419
/* Write it out and free it up */
1421
yaffs_wr_data_obj(cache->object,
1426
cache->object = NULL;
1428
} while (cache && chunk_written > 0);
1431
/* Hoosterman, disk full while writing cache out. */
1432
yaffs_trace(YAFFS_TRACE_ERROR,
1433
"yaffs tragedy: no space during cache write");
1436
/*yaffs_flush_whole_cache(dev)
1441
void yaffs_flush_whole_cache(struct yaffs_dev *dev)
1443
struct yaffs_obj *obj;
1444
int n_caches = dev->param.n_caches;
1447
/* Find a dirty object in the cache and flush it...
1448
* until there are no further dirty objects.
1452
for (i = 0; i < n_caches && !obj; i++) {
1453
if (dev->cache[i].object && dev->cache[i].dirty)
1454
obj = dev->cache[i].object;
1457
yaffs_flush_file_cache(obj);
1462
/* Grab us a cache chunk for use.
1463
* First look for an empty one.
1464
* Then look for the least recently used non-dirty one.
1465
* Then look for the least recently used dirty one...., flush and look again.
1467
static struct yaffs_cache *yaffs_grab_chunk_worker(struct yaffs_dev *dev)
1471
if (dev->param.n_caches > 0) {
1472
for (i = 0; i < dev->param.n_caches; i++) {
1473
if (!dev->cache[i].object)
1474
return &dev->cache[i];
1480
static struct yaffs_cache *yaffs_grab_chunk_cache(struct yaffs_dev *dev)
1482
struct yaffs_cache *cache;
1483
struct yaffs_obj *the_obj;
1487
if (dev->param.n_caches < 1)
1490
/* Try find a non-dirty one... */
1492
cache = yaffs_grab_chunk_worker(dev);
1495
/* They were all dirty, find the LRU object and flush
1496
* its cache, then find again.
1497
* NB what's here is not very accurate,
1498
* we actually flush the object with the LRU chunk.
1501
/* With locking we can't assume we can use entry zero,
1502
* Set the_obj to a valid pointer for Coverity. */
1503
the_obj = dev->cache[0].object;
1507
for (i = 0; i < dev->param.n_caches; i++) {
1508
if (dev->cache[i].object &&
1509
!dev->cache[i].locked &&
1510
(dev->cache[i].last_use < usage ||
1512
usage = dev->cache[i].last_use;
1513
the_obj = dev->cache[i].object;
1514
cache = &dev->cache[i];
1518
if (!cache || cache->dirty) {
1519
/* Flush and try again */
1520
yaffs_flush_file_cache(the_obj);
1521
cache = yaffs_grab_chunk_worker(dev);
1527
/* Find a cached chunk */
1528
static struct yaffs_cache *yaffs_find_chunk_cache(const struct yaffs_obj *obj,
1531
struct yaffs_dev *dev = obj->my_dev;
1534
if (dev->param.n_caches < 1)
1537
for (i = 0; i < dev->param.n_caches; i++) {
1538
if (dev->cache[i].object == obj &&
1539
dev->cache[i].chunk_id == chunk_id) {
1542
return &dev->cache[i];
1548
/* Mark the chunk for the least recently used algorithym */
1549
static void yaffs_use_cache(struct yaffs_dev *dev, struct yaffs_cache *cache,
1554
if (dev->param.n_caches < 1)
1557
if (dev->cache_last_use < 0 ||
1558
dev->cache_last_use > 100000000) {
1559
/* Reset the cache usages */
1560
for (i = 1; i < dev->param.n_caches; i++)
1561
dev->cache[i].last_use = 0;
1563
dev->cache_last_use = 0;
1565
dev->cache_last_use++;
1566
cache->last_use = dev->cache_last_use;
1572
/* Invalidate a single cache page.
1573
* Do this when a whole page gets written,
1574
* ie the short cache for this page is no longer valid.
1576
static void yaffs_invalidate_chunk_cache(struct yaffs_obj *object, int chunk_id)
1578
struct yaffs_cache *cache;
1580
if (object->my_dev->param.n_caches > 0) {
1581
cache = yaffs_find_chunk_cache(object, chunk_id);
1584
cache->object = NULL;
1588
/* Invalidate all the cache pages associated with this object
1589
* Do this whenever ther file is deleted or resized.
1591
static void yaffs_invalidate_whole_cache(struct yaffs_obj *in)
1594
struct yaffs_dev *dev = in->my_dev;
1596
if (dev->param.n_caches > 0) {
1597
/* Invalidate it. */
1598
for (i = 0; i < dev->param.n_caches; i++) {
1599
if (dev->cache[i].object == in)
1600
dev->cache[i].object = NULL;
1605
static void yaffs_unhash_obj(struct yaffs_obj *obj)
1608
struct yaffs_dev *dev = obj->my_dev;
1610
/* If it is still linked into the bucket list, free from the list */
1611
if (!list_empty(&obj->hash_link)) {
1612
list_del_init(&obj->hash_link);
1613
bucket = yaffs_hash_fn(obj->obj_id);
1614
dev->obj_bucket[bucket].count--;
1618
/* FreeObject frees up a Object and puts it back on the free list */
1619
static void yaffs_free_obj(struct yaffs_obj *obj)
1621
struct yaffs_dev *dev;
1628
yaffs_trace(YAFFS_TRACE_OS, "FreeObject %p inode %p",
1629
obj, obj->my_inode);
1632
if (!list_empty(&obj->siblings))
1635
if (obj->my_inode) {
1636
/* We're still hooked up to a cached inode.
1637
* Don't delete now, but mark for later deletion
1639
obj->defered_free = 1;
1643
yaffs_unhash_obj(obj);
1645
yaffs_free_raw_obj(dev, obj);
1647
dev->checkpoint_blocks_required = 0; /* force recalculation */
1650
void yaffs_handle_defered_free(struct yaffs_obj *obj)
1652
if (obj->defered_free)
1653
yaffs_free_obj(obj);
1656
static int yaffs_generic_obj_del(struct yaffs_obj *in)
1658
/* Iinvalidate the file's data in the cache, without flushing. */
1659
yaffs_invalidate_whole_cache(in);
1661
if (in->my_dev->param.is_yaffs2 && in->parent != in->my_dev->del_dir) {
1662
/* Move to unlinked directory so we have a deletion record */
1663
yaffs_change_obj_name(in, in->my_dev->del_dir, _Y("deleted"), 0,
1667
yaffs_remove_obj_from_dir(in);
1668
yaffs_chunk_del(in->my_dev, in->hdr_chunk, 1, __LINE__);
1676
static void yaffs_soft_del_file(struct yaffs_obj *obj)
1678
if (!obj->deleted ||
1679
obj->variant_type != YAFFS_OBJECT_TYPE_FILE ||
1683
if (obj->n_data_chunks <= 0) {
1684
/* Empty file with no duplicate object headers,
1685
* just delete it immediately */
1686
yaffs_free_tnode(obj->my_dev, obj->variant.file_variant.top);
1687
obj->variant.file_variant.top = NULL;
1688
yaffs_trace(YAFFS_TRACE_TRACING,
1689
"yaffs: Deleting empty file %d",
1691
yaffs_generic_obj_del(obj);
1693
yaffs_soft_del_worker(obj,
1694
obj->variant.file_variant.top,
1696
file_variant.top_level, 0);
1701
/* Pruning removes any part of the file structure tree that is beyond the
1702
* bounds of the file (ie that does not point to chunks).
1704
* A file should only get pruned when its size is reduced.
1706
* Before pruning, the chunks must be pulled from the tree and the
1707
* level 0 tnode entries must be zeroed out.
1708
* Could also use this for file deletion, but that's probably better handled
1709
* by a special case.
1711
* This function is recursive. For levels > 0 the function is called again on
1712
* any sub-tree. For level == 0 we just check if the sub-tree has data.
1713
* If there is no data in a subtree then it is pruned.
1716
static struct yaffs_tnode *yaffs_prune_worker(struct yaffs_dev *dev,
1717
struct yaffs_tnode *tn, u32 level,
1729
for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
1730
if (tn->internal[i]) {
1732
yaffs_prune_worker(dev,
1735
(i == 0) ? del0 : 1);
1738
if (tn->internal[i])
1742
int tnode_size_u32 = dev->tnode_size / sizeof(u32);
1743
u32 *map = (u32 *) tn;
1745
for (i = 0; !has_data && i < tnode_size_u32; i++) {
1751
if (has_data == 0 && del0) {
1752
/* Free and return NULL */
1753
yaffs_free_tnode(dev, tn);
1759
static int yaffs_prune_tree(struct yaffs_dev *dev,
1760
struct yaffs_file_var *file_struct)
1765
struct yaffs_tnode *tn;
1767
if (file_struct->top_level < 1)
1771
yaffs_prune_worker(dev, file_struct->top, file_struct->top_level, 0);
1773
/* Now we have a tree with all the non-zero branches NULL but
1774
* the height is the same as it was.
1775
* Let's see if we can trim internal tnodes to shorten the tree.
1776
* We can do this if only the 0th element in the tnode is in use
1777
* (ie all the non-zero are NULL)
1780
while (file_struct->top_level && !done) {
1781
tn = file_struct->top;
1784
for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
1785
if (tn->internal[i])
1790
file_struct->top = tn->internal[0];
1791
file_struct->top_level--;
1792
yaffs_free_tnode(dev, tn);
1801
/*-------------------- End of File Structure functions.-------------------*/
1803
/* alloc_empty_obj gets us a clean Object.*/
1804
static struct yaffs_obj *yaffs_alloc_empty_obj(struct yaffs_dev *dev)
1806
struct yaffs_obj *obj = yaffs_alloc_raw_obj(dev);
1813
/* Now sweeten it up... */
1815
memset(obj, 0, sizeof(struct yaffs_obj));
1816
obj->being_created = 1;
1820
obj->variant_type = YAFFS_OBJECT_TYPE_UNKNOWN;
1821
INIT_LIST_HEAD(&(obj->hard_links));
1822
INIT_LIST_HEAD(&(obj->hash_link));
1823
INIT_LIST_HEAD(&obj->siblings);
1825
/* Now make the directory sane */
1826
if (dev->root_dir) {
1827
obj->parent = dev->root_dir;
1828
list_add(&(obj->siblings),
1829
&dev->root_dir->variant.dir_variant.children);
1832
/* Add it to the lost and found directory.
1833
* NB Can't put root or lost-n-found in lost-n-found so
1834
* check if lost-n-found exists first
1836
if (dev->lost_n_found)
1837
yaffs_add_obj_to_dir(dev->lost_n_found, obj);
1839
obj->being_created = 0;
1841
dev->checkpoint_blocks_required = 0; /* force recalculation */
1846
static int yaffs_find_nice_bucket(struct yaffs_dev *dev)
1850
int lowest = 999999;
1852
/* Search for the shortest list or one that
1856
for (i = 0; i < 10 && lowest > 4; i++) {
1857
dev->bucket_finder++;
1858
dev->bucket_finder %= YAFFS_NOBJECT_BUCKETS;
1859
if (dev->obj_bucket[dev->bucket_finder].count < lowest) {
1860
lowest = dev->obj_bucket[dev->bucket_finder].count;
1861
l = dev->bucket_finder;
1868
static int yaffs_new_obj_id(struct yaffs_dev *dev)
1870
int bucket = yaffs_find_nice_bucket(dev);
1872
struct list_head *i;
1873
u32 n = (u32) bucket;
1875
/* Now find an object value that has not already been taken
1876
* by scanning the list.
1881
n += YAFFS_NOBJECT_BUCKETS;
1882
if (1 || dev->obj_bucket[bucket].count > 0) {
1883
list_for_each(i, &dev->obj_bucket[bucket].list) {
1884
/* If there is already one in the list */
1885
if (i && list_entry(i, struct yaffs_obj,
1886
hash_link)->obj_id == n) {
1895
static void yaffs_hash_obj(struct yaffs_obj *in)
1897
int bucket = yaffs_hash_fn(in->obj_id);
1898
struct yaffs_dev *dev = in->my_dev;
1900
list_add(&in->hash_link, &dev->obj_bucket[bucket].list);
1901
dev->obj_bucket[bucket].count++;
1904
struct yaffs_obj *yaffs_find_by_number(struct yaffs_dev *dev, u32 number)
1906
int bucket = yaffs_hash_fn(number);
1907
struct list_head *i;
1908
struct yaffs_obj *in;
1910
list_for_each(i, &dev->obj_bucket[bucket].list) {
1911
/* Look if it is in the list */
1912
in = list_entry(i, struct yaffs_obj, hash_link);
1913
if (in->obj_id == number) {
1914
/* Don't show if it is defered free */
1915
if (in->defered_free)
1924
struct yaffs_obj *yaffs_new_obj(struct yaffs_dev *dev, int number,
1925
enum yaffs_obj_type type)
1927
struct yaffs_obj *the_obj = NULL;
1928
struct yaffs_tnode *tn = NULL;
1931
number = yaffs_new_obj_id(dev);
1933
if (type == YAFFS_OBJECT_TYPE_FILE) {
1934
tn = yaffs_get_tnode(dev);
1939
the_obj = yaffs_alloc_empty_obj(dev);
1942
yaffs_free_tnode(dev, tn);
1947
the_obj->rename_allowed = 1;
1948
the_obj->unlink_allowed = 1;
1949
the_obj->obj_id = number;
1950
yaffs_hash_obj(the_obj);
1951
the_obj->variant_type = type;
1952
yaffs_load_current_time(the_obj, 1, 1);
1955
case YAFFS_OBJECT_TYPE_FILE:
1956
the_obj->variant.file_variant.file_size = 0;
1957
the_obj->variant.file_variant.scanned_size = 0;
1958
the_obj->variant.file_variant.shrink_size =
1959
yaffs_max_file_size(dev);
1960
the_obj->variant.file_variant.top_level = 0;
1961
the_obj->variant.file_variant.top = tn;
1963
case YAFFS_OBJECT_TYPE_DIRECTORY:
1964
INIT_LIST_HEAD(&the_obj->variant.dir_variant.children);
1965
INIT_LIST_HEAD(&the_obj->variant.dir_variant.dirty);
1967
case YAFFS_OBJECT_TYPE_SYMLINK:
1968
case YAFFS_OBJECT_TYPE_HARDLINK:
1969
case YAFFS_OBJECT_TYPE_SPECIAL:
1970
/* No action required */
1972
case YAFFS_OBJECT_TYPE_UNKNOWN:
1973
/* todo this should not happen */
1979
static struct yaffs_obj *yaffs_create_fake_dir(struct yaffs_dev *dev,
1980
int number, u32 mode)
1983
struct yaffs_obj *obj =
1984
yaffs_new_obj(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
1989
obj->fake = 1; /* it is fake so it might not use NAND */
1990
obj->rename_allowed = 0;
1991
obj->unlink_allowed = 0;
1994
obj->yst_mode = mode;
1996
obj->hdr_chunk = 0; /* Not a valid chunk. */
2002
static void yaffs_init_tnodes_and_objs(struct yaffs_dev *dev)
2008
yaffs_init_raw_tnodes_and_objs(dev);
2010
for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
2011
INIT_LIST_HEAD(&dev->obj_bucket[i].list);
2012
dev->obj_bucket[i].count = 0;
2016
struct yaffs_obj *yaffs_find_or_create_by_number(struct yaffs_dev *dev,
2018
enum yaffs_obj_type type)
2020
struct yaffs_obj *the_obj = NULL;
2023
the_obj = yaffs_find_by_number(dev, number);
2026
the_obj = yaffs_new_obj(dev, number, type);
2032
YCHAR *yaffs_clone_str(const YCHAR *str)
2034
YCHAR *new_str = NULL;
2040
len = yaffs_strnlen(str, YAFFS_MAX_ALIAS_LENGTH);
2041
new_str = kmalloc((len + 1) * sizeof(YCHAR), GFP_NOFS);
2043
yaffs_strncpy(new_str, str, len);
2050
*yaffs_update_parent() handles fixing a directories mtime and ctime when a new
2051
* link (ie. name) is created or deleted in the directory.
2054
* create dir/a : update dir's mtime/ctime
2055
* rm dir/a: update dir's mtime/ctime
2056
* modify dir/a: don't update dir's mtimme/ctime
2058
* This can be handled immediately or defered. Defering helps reduce the number
2059
* of updates when many files in a directory are changed within a brief period.
2061
* If the directory updating is defered then yaffs_update_dirty_dirs must be
2062
* called periodically.
2065
static void yaffs_update_parent(struct yaffs_obj *obj)
2067
struct yaffs_dev *dev;
2073
yaffs_load_current_time(obj, 0, 1);
2074
if (dev->param.defered_dir_update) {
2075
struct list_head *link = &obj->variant.dir_variant.dirty;
2077
if (list_empty(link)) {
2078
list_add(link, &dev->dirty_dirs);
2079
yaffs_trace(YAFFS_TRACE_BACKGROUND,
2080
"Added object %d to dirty directories",
2085
yaffs_update_oh(obj, NULL, 0, 0, 0, NULL);
2089
void yaffs_update_dirty_dirs(struct yaffs_dev *dev)
2091
struct list_head *link;
2092
struct yaffs_obj *obj;
2093
struct yaffs_dir_var *d_s;
2094
union yaffs_obj_var *o_v;
2096
yaffs_trace(YAFFS_TRACE_BACKGROUND, "Update dirty directories");
2098
while (!list_empty(&dev->dirty_dirs)) {
2099
link = dev->dirty_dirs.next;
2100
list_del_init(link);
2102
d_s = list_entry(link, struct yaffs_dir_var, dirty);
2103
o_v = list_entry(d_s, union yaffs_obj_var, dir_variant);
2104
obj = list_entry(o_v, struct yaffs_obj, variant);
2106
yaffs_trace(YAFFS_TRACE_BACKGROUND, "Update directory %d",
2110
yaffs_update_oh(obj, NULL, 0, 0, 0, NULL);
2115
* Mknod (create) a new object.
2116
* equiv_obj only has meaning for a hard link;
2117
* alias_str only has meaning for a symlink.
2118
* rdev only has meaning for devices (a subset of special objects)
2121
static struct yaffs_obj *yaffs_create_obj(enum yaffs_obj_type type,
2122
struct yaffs_obj *parent,
2127
struct yaffs_obj *equiv_obj,
2128
const YCHAR *alias_str, u32 rdev)
2130
struct yaffs_obj *in;
2132
struct yaffs_dev *dev = parent->my_dev;
2134
/* Check if the entry exists.
2135
* If it does then fail the call since we don't want a dup. */
2136
if (yaffs_find_by_name(parent, name))
2139
if (type == YAFFS_OBJECT_TYPE_SYMLINK) {
2140
str = yaffs_clone_str(alias_str);
2145
in = yaffs_new_obj(dev, -1, type);
2154
in->variant_type = type;
2156
in->yst_mode = mode;
2158
yaffs_attribs_init(in, gid, uid, rdev);
2160
in->n_data_chunks = 0;
2162
yaffs_set_obj_name(in, name);
2165
yaffs_add_obj_to_dir(parent, in);
2167
in->my_dev = parent->my_dev;
2170
case YAFFS_OBJECT_TYPE_SYMLINK:
2171
in->variant.symlink_variant.alias = str;
2173
case YAFFS_OBJECT_TYPE_HARDLINK:
2174
in->variant.hardlink_variant.equiv_obj = equiv_obj;
2175
in->variant.hardlink_variant.equiv_id = equiv_obj->obj_id;
2176
list_add(&in->hard_links, &equiv_obj->hard_links);
2178
case YAFFS_OBJECT_TYPE_FILE:
2179
case YAFFS_OBJECT_TYPE_DIRECTORY:
2180
case YAFFS_OBJECT_TYPE_SPECIAL:
2181
case YAFFS_OBJECT_TYPE_UNKNOWN:
2186
if (yaffs_update_oh(in, name, 0, 0, 0, NULL) < 0) {
2187
/* Could not create the object header, fail */
2193
yaffs_update_parent(parent);
2198
struct yaffs_obj *yaffs_create_file(struct yaffs_obj *parent,
2199
const YCHAR *name, u32 mode, u32 uid,
2202
return yaffs_create_obj(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
2203
uid, gid, NULL, NULL, 0);
2206
struct yaffs_obj *yaffs_create_dir(struct yaffs_obj *parent, const YCHAR *name,
2207
u32 mode, u32 uid, u32 gid)
2209
return yaffs_create_obj(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
2210
mode, uid, gid, NULL, NULL, 0);
2213
struct yaffs_obj *yaffs_create_special(struct yaffs_obj *parent,
2214
const YCHAR *name, u32 mode, u32 uid,
2217
return yaffs_create_obj(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
2218
uid, gid, NULL, NULL, rdev);
2221
struct yaffs_obj *yaffs_create_symlink(struct yaffs_obj *parent,
2222
const YCHAR *name, u32 mode, u32 uid,
2223
u32 gid, const YCHAR *alias)
2225
return yaffs_create_obj(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
2226
uid, gid, NULL, alias, 0);
2229
/* yaffs_link_obj returns the object id of the equivalent object.*/
2230
struct yaffs_obj *yaffs_link_obj(struct yaffs_obj *parent, const YCHAR * name,
2231
struct yaffs_obj *equiv_obj)
2233
/* Get the real object in case we were fed a hard link obj */
2234
equiv_obj = yaffs_get_equivalent_obj(equiv_obj);
2236
if (yaffs_create_obj(YAFFS_OBJECT_TYPE_HARDLINK,
2237
parent, name, 0, 0, 0,
2238
equiv_obj, NULL, 0))
2247
/*---------------------- Block Management and Page Allocation -------------*/
2249
static void yaffs_deinit_blocks(struct yaffs_dev *dev)
2251
if (dev->block_info_alt && dev->block_info)
2252
vfree(dev->block_info);
2254
kfree(dev->block_info);
2256
dev->block_info_alt = 0;
2258
dev->block_info = NULL;
2260
if (dev->chunk_bits_alt && dev->chunk_bits)
2261
vfree(dev->chunk_bits);
2263
kfree(dev->chunk_bits);
2264
dev->chunk_bits_alt = 0;
2265
dev->chunk_bits = NULL;
2268
static int yaffs_init_blocks(struct yaffs_dev *dev)
2270
int n_blocks = dev->internal_end_block - dev->internal_start_block + 1;
2272
dev->block_info = NULL;
2273
dev->chunk_bits = NULL;
2274
dev->alloc_block = -1; /* force it to get a new one */
2276
/* If the first allocation strategy fails, thry the alternate one */
2278
kmalloc(n_blocks * sizeof(struct yaffs_block_info), GFP_NOFS);
2279
if (!dev->block_info) {
2281
vmalloc(n_blocks * sizeof(struct yaffs_block_info));
2282
dev->block_info_alt = 1;
2284
dev->block_info_alt = 0;
2287
if (!dev->block_info)
2290
/* Set up dynamic blockinfo stuff. Round up bytes. */
2291
dev->chunk_bit_stride = (dev->param.chunks_per_block + 7) / 8;
2293
kmalloc(dev->chunk_bit_stride * n_blocks, GFP_NOFS);
2294
if (!dev->chunk_bits) {
2296
vmalloc(dev->chunk_bit_stride * n_blocks);
2297
dev->chunk_bits_alt = 1;
2299
dev->chunk_bits_alt = 0;
2301
if (!dev->chunk_bits)
2305
memset(dev->block_info, 0, n_blocks * sizeof(struct yaffs_block_info));
2306
memset(dev->chunk_bits, 0, dev->chunk_bit_stride * n_blocks);
2310
yaffs_deinit_blocks(dev);
2315
void yaffs_block_became_dirty(struct yaffs_dev *dev, int block_no)
2317
struct yaffs_block_info *bi = yaffs_get_block_info(dev, block_no);
2321
/* If the block is still healthy erase it and mark as clean.
2322
* If the block has had a data failure, then retire it.
2325
yaffs_trace(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
2326
"yaffs_block_became_dirty block %d state %d %s",
2327
block_no, bi->block_state,
2328
(bi->needs_retiring) ? "needs retiring" : "");
2330
yaffs2_clear_oldest_dirty_seq(dev, bi);
2332
bi->block_state = YAFFS_BLOCK_STATE_DIRTY;
2334
/* If this is the block being garbage collected then stop gc'ing */
2335
if (block_no == dev->gc_block)
2338
/* If this block is currently the best candidate for gc
2339
* then drop as a candidate */
2340
if (block_no == dev->gc_dirtiest) {
2341
dev->gc_dirtiest = 0;
2342
dev->gc_pages_in_use = 0;
2345
if (!bi->needs_retiring) {
2346
yaffs2_checkpt_invalidate(dev);
2347
erased_ok = yaffs_erase_block(dev, block_no);
2349
dev->n_erase_failures++;
2350
yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2351
"**>> Erasure failed %d", block_no);
2355
/* Verify erasure if needed */
2357
((yaffs_trace_mask & YAFFS_TRACE_ERASE) ||
2358
!yaffs_skip_verification(dev))) {
2359
for (i = 0; i < dev->param.chunks_per_block; i++) {
2360
if (!yaffs_check_chunk_erased(dev,
2361
block_no * dev->param.chunks_per_block + i)) {
2362
yaffs_trace(YAFFS_TRACE_ERROR,
2363
">>Block %d erasure supposedly OK, but chunk %d not erased",
2370
/* We lost a block of free space */
2371
dev->n_free_chunks -= dev->param.chunks_per_block;
2372
yaffs_retire_block(dev, block_no);
2373
yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2374
"**>> Block %d retired", block_no);
2378
/* Clean it up... */
2379
bi->block_state = YAFFS_BLOCK_STATE_EMPTY;
2381
dev->n_erased_blocks++;
2382
bi->pages_in_use = 0;
2383
bi->soft_del_pages = 0;
2384
bi->has_shrink_hdr = 0;
2385
bi->skip_erased_check = 1; /* Clean, so no need to check */
2386
bi->gc_prioritise = 0;
2387
bi->has_summary = 0;
2389
yaffs_clear_chunk_bits(dev, block_no);
2391
yaffs_trace(YAFFS_TRACE_ERASE, "Erased block %d", block_no);
2394
static inline int yaffs_gc_process_chunk(struct yaffs_dev *dev,
2395
struct yaffs_block_info *bi,
2396
int old_chunk, u8 *buffer)
2400
struct yaffs_ext_tags tags;
2401
struct yaffs_obj *object;
2403
int ret_val = YAFFS_OK;
2405
memset(&tags, 0, sizeof(tags));
2406
yaffs_rd_chunk_tags_nand(dev, old_chunk,
2408
object = yaffs_find_by_number(dev, tags.obj_id);
2410
yaffs_trace(YAFFS_TRACE_GC_DETAIL,
2411
"Collecting chunk in block %d, %d %d %d ",
2412
dev->gc_chunk, tags.obj_id,
2413
tags.chunk_id, tags.n_bytes);
2415
if (object && !yaffs_skip_verification(dev)) {
2416
if (tags.chunk_id == 0)
2419
else if (object->soft_del)
2420
/* Defeat the test */
2421
matching_chunk = old_chunk;
2424
yaffs_find_chunk_in_file
2425
(object, tags.chunk_id,
2428
if (old_chunk != matching_chunk)
2429
yaffs_trace(YAFFS_TRACE_ERROR,
2430
"gc: page in gc mismatch: %d %d %d %d",
2438
yaffs_trace(YAFFS_TRACE_ERROR,
2439
"page %d in gc has no object: %d %d %d ",
2441
tags.obj_id, tags.chunk_id,
2447
object->soft_del && tags.chunk_id != 0) {
2448
/* Data chunk in a soft deleted file,
2450
* It's a soft deleted data chunk,
2451
* No need to copy this, just forget
2452
* about it and fix up the object.
2455
/* Free chunks already includes
2456
* softdeleted chunks, how ever this
2457
* chunk is going to soon be really
2458
* deleted which will increment free
2459
* chunks. We have to decrement free
2460
* chunks so this works out properly.
2462
dev->n_free_chunks--;
2463
bi->soft_del_pages--;
2465
object->n_data_chunks--;
2466
if (object->n_data_chunks <= 0) {
2467
/* remeber to clean up obj */
2468
dev->gc_cleanup_list[dev->n_clean_ups] = tags.obj_id;
2472
} else if (object) {
2473
/* It's either a data chunk in a live
2474
* file or an ObjectHeader, so we're
2476
* NB Need to keep the ObjectHeaders of
2477
* deleted files until the whole file
2478
* has been deleted off
2480
tags.serial_number++;
2483
if (tags.chunk_id == 0) {
2484
/* It is an object Id,
2485
* We need to nuke the
2486
* shrinkheader flags since its
2488
* Also need to clean up
2491
struct yaffs_obj_hdr *oh;
2492
oh = (struct yaffs_obj_hdr *) buffer;
2495
tags.extra_is_shrink = 0;
2496
oh->shadows_obj = 0;
2497
oh->inband_shadowed_obj_id = 0;
2498
tags.extra_shadows = 0;
2500
/* Update file size */
2501
if (object->variant_type == YAFFS_OBJECT_TYPE_FILE) {
2502
yaffs_oh_size_load(oh,
2503
object->variant.file_variant.file_size);
2504
tags.extra_file_size =
2505
object->variant.file_variant.file_size;
2508
yaffs_verify_oh(object, oh, &tags, 1);
2510
yaffs_write_new_chunk(dev, (u8 *) oh, &tags, 1);
2513
yaffs_write_new_chunk(dev, buffer, &tags, 1);
2516
if (new_chunk < 0) {
2517
ret_val = YAFFS_FAIL;
2520
/* Now fix up the Tnodes etc. */
2522
if (tags.chunk_id == 0) {
2524
object->hdr_chunk = new_chunk;
2525
object->serial = tags.serial_number;
2527
/* It's a data chunk */
2528
yaffs_put_chunk_in_file(object, tags.chunk_id,
2533
if (ret_val == YAFFS_OK)
2534
yaffs_chunk_del(dev, old_chunk, mark_flash, __LINE__);
2538
static int yaffs_gc_block(struct yaffs_dev *dev, int block, int whole_block)
2541
int ret_val = YAFFS_OK;
2543
int is_checkpt_block;
2545
int chunks_before = yaffs_get_erased_chunks(dev);
2547
struct yaffs_block_info *bi = yaffs_get_block_info(dev, block);
2549
is_checkpt_block = (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT);
2551
yaffs_trace(YAFFS_TRACE_TRACING,
2552
"Collecting block %d, in use %d, shrink %d, whole_block %d",
2553
block, bi->pages_in_use, bi->has_shrink_hdr,
2556
/*yaffs_verify_free_chunks(dev); */
2558
if (bi->block_state == YAFFS_BLOCK_STATE_FULL)
2559
bi->block_state = YAFFS_BLOCK_STATE_COLLECTING;
2561
bi->has_shrink_hdr = 0; /* clear the flag so that the block can erase */
2563
dev->gc_disable = 1;
2565
yaffs_summary_gc(dev, block);
2567
if (is_checkpt_block || !yaffs_still_some_chunks(dev, block)) {
2568
yaffs_trace(YAFFS_TRACE_TRACING,
2569
"Collecting block %d that has no chunks in use",
2571
yaffs_block_became_dirty(dev, block);
2574
u8 *buffer = yaffs_get_temp_buffer(dev);
2576
yaffs_verify_blk(dev, bi, block);
2578
max_copies = (whole_block) ? dev->param.chunks_per_block : 5;
2579
old_chunk = block * dev->param.chunks_per_block + dev->gc_chunk;
2581
for (/* init already done */ ;
2582
ret_val == YAFFS_OK &&
2583
dev->gc_chunk < dev->param.chunks_per_block &&
2584
(bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) &&
2586
dev->gc_chunk++, old_chunk++) {
2587
if (yaffs_check_chunk_bit(dev, block, dev->gc_chunk)) {
2588
/* Page is in use and might need to be copied */
2590
ret_val = yaffs_gc_process_chunk(dev, bi,
2594
yaffs_release_temp_buffer(dev, buffer);
2597
yaffs_verify_collected_blk(dev, bi, block);
2599
if (bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) {
2601
* The gc did not complete. Set block state back to FULL
2602
* because checkpointing does not restore gc.
2604
bi->block_state = YAFFS_BLOCK_STATE_FULL;
2606
/* The gc completed. */
2607
/* Do any required cleanups */
2608
for (i = 0; i < dev->n_clean_ups; i++) {
2609
/* Time to delete the file too */
2610
struct yaffs_obj *object =
2611
yaffs_find_by_number(dev, dev->gc_cleanup_list[i]);
2613
yaffs_free_tnode(dev,
2614
object->variant.file_variant.top);
2615
object->variant.file_variant.top = NULL;
2616
yaffs_trace(YAFFS_TRACE_GC,
2617
"yaffs: About to finally delete object %d",
2619
yaffs_generic_obj_del(object);
2620
object->my_dev->n_deleted_files--;
2624
chunks_after = yaffs_get_erased_chunks(dev);
2625
if (chunks_before >= chunks_after)
2626
yaffs_trace(YAFFS_TRACE_GC,
2627
"gc did not increase free chunks before %d after %d",
2628
chunks_before, chunks_after);
2631
dev->n_clean_ups = 0;
2634
dev->gc_disable = 0;
2640
* find_gc_block() selects the dirtiest block (or close enough)
2641
* for garbage collection.
2644
static unsigned yaffs_find_gc_block(struct yaffs_dev *dev,
2645
int aggressive, int background)
2649
unsigned selected = 0;
2650
int prioritised = 0;
2651
int prioritised_exist = 0;
2652
struct yaffs_block_info *bi;
2655
/* First let's see if we need to grab a prioritised block */
2656
if (dev->has_pending_prioritised_gc && !aggressive) {
2657
dev->gc_dirtiest = 0;
2658
bi = dev->block_info;
2659
for (i = dev->internal_start_block;
2660
i <= dev->internal_end_block && !selected; i++) {
2662
if (bi->gc_prioritise) {
2663
prioritised_exist = 1;
2664
if (bi->block_state == YAFFS_BLOCK_STATE_FULL &&
2665
yaffs_block_ok_for_gc(dev, bi)) {
2674
* If there is a prioritised block and none was selected then
2675
* this happened because there is at least one old dirty block
2676
* gumming up the works. Let's gc the oldest dirty block.
2679
if (prioritised_exist &&
2680
!selected && dev->oldest_dirty_block > 0)
2681
selected = dev->oldest_dirty_block;
2683
if (!prioritised_exist) /* None found, so we can clear this */
2684
dev->has_pending_prioritised_gc = 0;
2687
/* If we're doing aggressive GC then we are happy to take a less-dirty
2688
* block, and search harder.
2689
* else (leasurely gc), then we only bother to do this if the
2690
* block has only a few pages in use.
2696
dev->internal_end_block - dev->internal_start_block + 1;
2698
threshold = dev->param.chunks_per_block;
2699
iterations = n_blocks;
2704
max_threshold = dev->param.chunks_per_block / 2;
2706
max_threshold = dev->param.chunks_per_block / 8;
2708
if (max_threshold < YAFFS_GC_PASSIVE_THRESHOLD)
2709
max_threshold = YAFFS_GC_PASSIVE_THRESHOLD;
2711
threshold = background ? (dev->gc_not_done + 2) * 2 : 0;
2712
if (threshold < YAFFS_GC_PASSIVE_THRESHOLD)
2713
threshold = YAFFS_GC_PASSIVE_THRESHOLD;
2714
if (threshold > max_threshold)
2715
threshold = max_threshold;
2717
iterations = n_blocks / 16 + 1;
2718
if (iterations > 100)
2724
(dev->gc_dirtiest < 1 ||
2725
dev->gc_pages_in_use > YAFFS_GC_GOOD_ENOUGH);
2727
dev->gc_block_finder++;
2728
if (dev->gc_block_finder < dev->internal_start_block ||
2729
dev->gc_block_finder > dev->internal_end_block)
2730
dev->gc_block_finder =
2731
dev->internal_start_block;
2733
bi = yaffs_get_block_info(dev, dev->gc_block_finder);
2735
pages_used = bi->pages_in_use - bi->soft_del_pages;
2737
if (bi->block_state == YAFFS_BLOCK_STATE_FULL &&
2738
pages_used < dev->param.chunks_per_block &&
2739
(dev->gc_dirtiest < 1 ||
2740
pages_used < dev->gc_pages_in_use) &&
2741
yaffs_block_ok_for_gc(dev, bi)) {
2742
dev->gc_dirtiest = dev->gc_block_finder;
2743
dev->gc_pages_in_use = pages_used;
2747
if (dev->gc_dirtiest > 0 && dev->gc_pages_in_use <= threshold)
2748
selected = dev->gc_dirtiest;
2752
* If nothing has been selected for a while, try the oldest dirty
2753
* because that's gumming up the works.
2756
if (!selected && dev->param.is_yaffs2 &&
2757
dev->gc_not_done >= (background ? 10 : 20)) {
2758
yaffs2_find_oldest_dirty_seq(dev);
2759
if (dev->oldest_dirty_block > 0) {
2760
selected = dev->oldest_dirty_block;
2761
dev->gc_dirtiest = selected;
2762
dev->oldest_dirty_gc_count++;
2763
bi = yaffs_get_block_info(dev, selected);
2764
dev->gc_pages_in_use =
2765
bi->pages_in_use - bi->soft_del_pages;
2767
dev->gc_not_done = 0;
2772
yaffs_trace(YAFFS_TRACE_GC,
2773
"GC Selected block %d with %d free, prioritised:%d",
2775
dev->param.chunks_per_block - dev->gc_pages_in_use,
2782
dev->gc_dirtiest = 0;
2783
dev->gc_pages_in_use = 0;
2784
dev->gc_not_done = 0;
2785
if (dev->refresh_skip > 0)
2786
dev->refresh_skip--;
2789
yaffs_trace(YAFFS_TRACE_GC,
2790
"GC none: finder %d skip %d threshold %d dirtiest %d using %d oldest %d%s",
2791
dev->gc_block_finder, dev->gc_not_done, threshold,
2792
dev->gc_dirtiest, dev->gc_pages_in_use,
2793
dev->oldest_dirty_block, background ? " bg" : "");
2799
/* New garbage collector
2800
* If we're very low on erased blocks then we do aggressive garbage collection
2801
* otherwise we do "leasurely" garbage collection.
2802
* Aggressive gc looks further (whole array) and will accept less dirty blocks.
2803
* Passive gc only inspects smaller areas and only accepts more dirty blocks.
2805
* The idea is to help clear out space in a more spread-out manner.
2806
* Dunno if it really does anything useful.
2808
static int yaffs_check_gc(struct yaffs_dev *dev, int background)
2811
int gc_ok = YAFFS_OK;
2815
int checkpt_block_adjust;
2817
if (dev->param.gc_control && (dev->param.gc_control(dev) & 1) == 0)
2820
if (dev->gc_disable)
2821
/* Bail out so we don't get recursive gc */
2824
/* This loop should pass the first time.
2825
* Only loops here if the collection does not increase space.
2831
checkpt_block_adjust = yaffs_calc_checkpt_blocks_required(dev);
2834
dev->param.n_reserved_blocks + checkpt_block_adjust + 1;
2836
dev->n_erased_blocks * dev->param.chunks_per_block;
2838
/* If we need a block soon then do aggressive gc. */
2839
if (dev->n_erased_blocks < min_erased)
2843
&& erased_chunks > (dev->n_free_chunks / 4))
2846
if (dev->gc_skip > 20)
2848
if (erased_chunks < dev->n_free_chunks / 2 ||
2849
dev->gc_skip < 1 || background)
2859
/* If we don't already have a block being gc'd then see if we
2860
* should start another */
2862
if (dev->gc_block < 1 && !aggressive) {
2863
dev->gc_block = yaffs2_find_refresh_block(dev);
2865
dev->n_clean_ups = 0;
2867
if (dev->gc_block < 1) {
2869
yaffs_find_gc_block(dev, aggressive, background);
2871
dev->n_clean_ups = 0;
2874
if (dev->gc_block > 0) {
2877
dev->passive_gc_count++;
2879
yaffs_trace(YAFFS_TRACE_GC,
2880
"yaffs: GC n_erased_blocks %d aggressive %d",
2881
dev->n_erased_blocks, aggressive);
2883
gc_ok = yaffs_gc_block(dev, dev->gc_block, aggressive);
2886
if (dev->n_erased_blocks < (dev->param.n_reserved_blocks) &&
2887
dev->gc_block > 0) {
2888
yaffs_trace(YAFFS_TRACE_GC,
2889
"yaffs: GC !!!no reclaim!!! n_erased_blocks %d after try %d block %d",
2890
dev->n_erased_blocks, max_tries,
2893
} while ((dev->n_erased_blocks < dev->param.n_reserved_blocks) &&
2894
(dev->gc_block > 0) && (max_tries < 2));
2896
return aggressive ? gc_ok : YAFFS_OK;
2901
* Garbage collects. Intended to be called from a background thread.
2902
* Returns non-zero if at least half the free chunks are erased.
2904
int yaffs_bg_gc(struct yaffs_dev *dev, unsigned urgency)
2906
int erased_chunks = dev->n_erased_blocks * dev->param.chunks_per_block;
2908
yaffs_trace(YAFFS_TRACE_BACKGROUND, "Background gc %u", urgency);
2910
yaffs_check_gc(dev, 1);
2911
return erased_chunks > dev->n_free_chunks / 2;
2914
/*-------------------- Data file manipulation -----------------*/
2916
static int yaffs_rd_data_obj(struct yaffs_obj *in, int inode_chunk, u8 * buffer)
2918
int nand_chunk = yaffs_find_chunk_in_file(in, inode_chunk, NULL);
2920
if (nand_chunk >= 0)
2921
return yaffs_rd_chunk_tags_nand(in->my_dev, nand_chunk,
2924
yaffs_trace(YAFFS_TRACE_NANDACCESS,
2925
"Chunk %d not found zero instead",
2927
/* get sane (zero) data if you read a hole */
2928
memset(buffer, 0, in->my_dev->data_bytes_per_chunk);
2934
void yaffs_chunk_del(struct yaffs_dev *dev, int chunk_id, int mark_flash,
2939
struct yaffs_ext_tags tags;
2940
struct yaffs_block_info *bi;
2946
block = chunk_id / dev->param.chunks_per_block;
2947
page = chunk_id % dev->param.chunks_per_block;
2949
if (!yaffs_check_chunk_bit(dev, block, page))
2950
yaffs_trace(YAFFS_TRACE_VERIFY,
2951
"Deleting invalid chunk %d", chunk_id);
2953
bi = yaffs_get_block_info(dev, block);
2955
yaffs2_update_oldest_dirty_seq(dev, block, bi);
2957
yaffs_trace(YAFFS_TRACE_DELETION,
2958
"line %d delete of chunk %d",
2961
if (!dev->param.is_yaffs2 && mark_flash &&
2962
bi->block_state != YAFFS_BLOCK_STATE_COLLECTING) {
2964
memset(&tags, 0, sizeof(tags));
2965
tags.is_deleted = 1;
2966
yaffs_wr_chunk_tags_nand(dev, chunk_id, NULL, &tags);
2967
yaffs_handle_chunk_update(dev, chunk_id, &tags);
2969
dev->n_unmarked_deletions++;
2972
/* Pull out of the management area.
2973
* If the whole block became dirty, this will kick off an erasure.
2975
if (bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING ||
2976
bi->block_state == YAFFS_BLOCK_STATE_FULL ||
2977
bi->block_state == YAFFS_BLOCK_STATE_NEEDS_SCAN ||
2978
bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) {
2979
dev->n_free_chunks++;
2980
yaffs_clear_chunk_bit(dev, block, page);
2983
if (bi->pages_in_use == 0 &&
2984
!bi->has_shrink_hdr &&
2985
bi->block_state != YAFFS_BLOCK_STATE_ALLOCATING &&
2986
bi->block_state != YAFFS_BLOCK_STATE_NEEDS_SCAN) {
2987
yaffs_block_became_dirty(dev, block);
2992
static int yaffs_wr_data_obj(struct yaffs_obj *in, int inode_chunk,
2993
const u8 *buffer, int n_bytes, int use_reserve)
2995
/* Find old chunk Need to do this to get serial number
2996
* Write new one and patch into tree.
2997
* Invalidate old tags.
3001
struct yaffs_ext_tags prev_tags;
3003
struct yaffs_ext_tags new_tags;
3004
struct yaffs_dev *dev = in->my_dev;
3006
yaffs_check_gc(dev, 0);
3008
/* Get the previous chunk at this location in the file if it exists.
3009
* If it does not exist then put a zero into the tree. This creates
3010
* the tnode now, rather than later when it is harder to clean up.
3012
prev_chunk_id = yaffs_find_chunk_in_file(in, inode_chunk, &prev_tags);
3013
if (prev_chunk_id < 1 &&
3014
!yaffs_put_chunk_in_file(in, inode_chunk, 0, 0))
3017
/* Set up new tags */
3018
memset(&new_tags, 0, sizeof(new_tags));
3020
new_tags.chunk_id = inode_chunk;
3021
new_tags.obj_id = in->obj_id;
3022
new_tags.serial_number =
3023
(prev_chunk_id > 0) ? prev_tags.serial_number + 1 : 1;
3024
new_tags.n_bytes = n_bytes;
3026
if (n_bytes < 1 || n_bytes > dev->param.total_bytes_per_chunk) {
3027
yaffs_trace(YAFFS_TRACE_ERROR,
3028
"Writing %d bytes to chunk!!!!!!!!!",
3034
yaffs_write_new_chunk(dev, buffer, &new_tags, use_reserve);
3036
if (new_chunk_id > 0) {
3037
yaffs_put_chunk_in_file(in, inode_chunk, new_chunk_id, 0);
3039
if (prev_chunk_id > 0)
3040
yaffs_chunk_del(dev, prev_chunk_id, 1, __LINE__);
3042
yaffs_verify_file_sane(in);
3044
return new_chunk_id;
3050
static int yaffs_do_xattrib_mod(struct yaffs_obj *obj, int set,
3051
const YCHAR *name, const void *value, int size,
3054
struct yaffs_xattr_mod xmod;
3062
xmod.result = -ENOSPC;
3064
result = yaffs_update_oh(obj, NULL, 0, 0, 0, &xmod);
3072
static int yaffs_apply_xattrib_mod(struct yaffs_obj *obj, char *buffer,
3073
struct yaffs_xattr_mod *xmod)
3076
int x_offs = sizeof(struct yaffs_obj_hdr);
3077
struct yaffs_dev *dev = obj->my_dev;
3078
int x_size = dev->data_bytes_per_chunk - sizeof(struct yaffs_obj_hdr);
3079
char *x_buffer = buffer + x_offs;
3083
nval_set(x_buffer, x_size, xmod->name, xmod->data,
3084
xmod->size, xmod->flags);
3086
retval = nval_del(x_buffer, x_size, xmod->name);
3088
obj->has_xattr = nval_hasvalues(x_buffer, x_size);
3089
obj->xattr_known = 1;
3090
xmod->result = retval;
3095
static int yaffs_do_xattrib_fetch(struct yaffs_obj *obj, const YCHAR *name,
3096
void *value, int size)
3098
char *buffer = NULL;
3100
struct yaffs_ext_tags tags;
3101
struct yaffs_dev *dev = obj->my_dev;
3102
int x_offs = sizeof(struct yaffs_obj_hdr);
3103
int x_size = dev->data_bytes_per_chunk - sizeof(struct yaffs_obj_hdr);
3107
if (obj->hdr_chunk < 1)
3110
/* If we know that the object has no xattribs then don't do all the
3111
* reading and parsing.
3113
if (obj->xattr_known && !obj->has_xattr) {
3120
buffer = (char *)yaffs_get_temp_buffer(dev);
3125
yaffs_rd_chunk_tags_nand(dev, obj->hdr_chunk, (u8 *) buffer, &tags);
3127
if (result != YAFFS_OK)
3130
x_buffer = buffer + x_offs;
3132
if (!obj->xattr_known) {
3133
obj->has_xattr = nval_hasvalues(x_buffer, x_size);
3134
obj->xattr_known = 1;
3138
retval = nval_get(x_buffer, x_size, name, value, size);
3140
retval = nval_list(x_buffer, x_size, value, size);
3142
yaffs_release_temp_buffer(dev, (u8 *) buffer);
3146
int yaffs_set_xattrib(struct yaffs_obj *obj, const YCHAR * name,
3147
const void *value, int size, int flags)
3149
return yaffs_do_xattrib_mod(obj, 1, name, value, size, flags);
3152
int yaffs_remove_xattrib(struct yaffs_obj *obj, const YCHAR * name)
3154
return yaffs_do_xattrib_mod(obj, 0, name, NULL, 0, 0);
3157
int yaffs_get_xattrib(struct yaffs_obj *obj, const YCHAR * name, void *value,
3160
return yaffs_do_xattrib_fetch(obj, name, value, size);
3163
int yaffs_list_xattrib(struct yaffs_obj *obj, char *buffer, int size)
3165
return yaffs_do_xattrib_fetch(obj, NULL, buffer, size);
3168
static void yaffs_check_obj_details_loaded(struct yaffs_obj *in)
3171
struct yaffs_obj_hdr *oh;
3172
struct yaffs_dev *dev;
3173
struct yaffs_ext_tags tags;
3175
if (!in || !in->lazy_loaded || in->hdr_chunk < 1)
3179
in->lazy_loaded = 0;
3180
buf = yaffs_get_temp_buffer(dev);
3182
yaffs_rd_chunk_tags_nand(dev, in->hdr_chunk, buf, &tags);
3183
oh = (struct yaffs_obj_hdr *)buf;
3185
in->yst_mode = oh->yst_mode;
3186
yaffs_load_attribs(in, oh);
3187
yaffs_set_obj_name_from_oh(in, oh);
3189
if (in->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) {
3190
in->variant.symlink_variant.alias =
3191
yaffs_clone_str(oh->alias);
3193
yaffs_release_temp_buffer(dev, buf);
3196
static void yaffs_load_name_from_oh(struct yaffs_dev *dev, YCHAR *name,
3197
const YCHAR *oh_name, int buff_size)
3199
#ifdef CONFIG_YAFFS_AUTO_UNICODE
3200
if (dev->param.auto_unicode) {
3202
/* It is an ASCII name, do an ASCII to
3203
* unicode conversion */
3204
const char *ascii_oh_name = (const char *)oh_name;
3205
int n = buff_size - 1;
3206
while (n > 0 && *ascii_oh_name) {
3207
*name = *ascii_oh_name;
3213
yaffs_strncpy(name, oh_name + 1, buff_size - 1);
3220
yaffs_strncpy(name, oh_name, buff_size - 1);
3224
static void yaffs_load_oh_from_name(struct yaffs_dev *dev, YCHAR *oh_name,
3227
#ifdef CONFIG_YAFFS_AUTO_UNICODE
3232
if (dev->param.auto_unicode) {
3237
/* Figure out if the name will fit in ascii character set */
3238
while (is_ascii && *w) {
3245
/* It is an ASCII name, so convert unicode to ascii */
3246
char *ascii_oh_name = (char *)oh_name;
3247
int n = YAFFS_MAX_NAME_LENGTH - 1;
3248
while (n > 0 && *name) {
3249
*ascii_oh_name = *name;
3255
/* Unicode name, so save starting at the second YCHAR */
3257
yaffs_strncpy(oh_name + 1, name, YAFFS_MAX_NAME_LENGTH - 2);
3264
yaffs_strncpy(oh_name, name, YAFFS_MAX_NAME_LENGTH - 1);
3268
/* UpdateObjectHeader updates the header on NAND for an object.
3269
* If name is not NULL, then that new name is used.
3271
int yaffs_update_oh(struct yaffs_obj *in, const YCHAR *name, int force,
3272
int is_shrink, int shadows, struct yaffs_xattr_mod *xmod)
3275
struct yaffs_block_info *bi;
3276
struct yaffs_dev *dev = in->my_dev;
3280
struct yaffs_ext_tags new_tags;
3281
struct yaffs_ext_tags old_tags;
3282
const YCHAR *alias = NULL;
3284
YCHAR old_name[YAFFS_MAX_NAME_LENGTH + 1];
3285
struct yaffs_obj_hdr *oh = NULL;
3286
loff_t file_size = 0;
3288
yaffs_strcpy(old_name, _Y("silly old name"));
3290
if (in->fake && in != dev->root_dir && !force && !xmod)
3293
yaffs_check_gc(dev, 0);
3294
yaffs_check_obj_details_loaded(in);
3296
buffer = yaffs_get_temp_buffer(in->my_dev);
3297
oh = (struct yaffs_obj_hdr *)buffer;
3299
prev_chunk_id = in->hdr_chunk;
3301
if (prev_chunk_id > 0) {
3302
yaffs_rd_chunk_tags_nand(dev, prev_chunk_id,
3305
yaffs_verify_oh(in, oh, &old_tags, 0);
3306
memcpy(old_name, oh->name, sizeof(oh->name));
3307
memset(buffer, 0xff, sizeof(struct yaffs_obj_hdr));
3309
memset(buffer, 0xff, dev->data_bytes_per_chunk);
3312
oh->type = in->variant_type;
3313
oh->yst_mode = in->yst_mode;
3314
oh->shadows_obj = oh->inband_shadowed_obj_id = shadows;
3316
yaffs_load_attribs_oh(oh, in);
3319
oh->parent_obj_id = in->parent->obj_id;
3321
oh->parent_obj_id = 0;
3323
if (name && *name) {
3324
memset(oh->name, 0, sizeof(oh->name));
3325
yaffs_load_oh_from_name(dev, oh->name, name);
3326
} else if (prev_chunk_id > 0) {
3327
memcpy(oh->name, old_name, sizeof(oh->name));
3329
memset(oh->name, 0, sizeof(oh->name));
3332
oh->is_shrink = is_shrink;
3334
switch (in->variant_type) {
3335
case YAFFS_OBJECT_TYPE_UNKNOWN:
3336
/* Should not happen */
3338
case YAFFS_OBJECT_TYPE_FILE:
3339
if (oh->parent_obj_id != YAFFS_OBJECTID_DELETED &&
3340
oh->parent_obj_id != YAFFS_OBJECTID_UNLINKED)
3341
file_size = in->variant.file_variant.file_size;
3342
yaffs_oh_size_load(oh, file_size);
3344
case YAFFS_OBJECT_TYPE_HARDLINK:
3345
oh->equiv_id = in->variant.hardlink_variant.equiv_id;
3347
case YAFFS_OBJECT_TYPE_SPECIAL:
3350
case YAFFS_OBJECT_TYPE_DIRECTORY:
3353
case YAFFS_OBJECT_TYPE_SYMLINK:
3354
alias = in->variant.symlink_variant.alias;
3356
alias = _Y("no alias");
3357
yaffs_strncpy(oh->alias, alias, YAFFS_MAX_ALIAS_LENGTH);
3358
oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
3362
/* process any xattrib modifications */
3364
yaffs_apply_xattrib_mod(in, (char *)buffer, xmod);
3367
memset(&new_tags, 0, sizeof(new_tags));
3369
new_tags.chunk_id = 0;
3370
new_tags.obj_id = in->obj_id;
3371
new_tags.serial_number = in->serial;
3373
/* Add extra info for file header */
3374
new_tags.extra_available = 1;
3375
new_tags.extra_parent_id = oh->parent_obj_id;
3376
new_tags.extra_file_size = file_size;
3377
new_tags.extra_is_shrink = oh->is_shrink;
3378
new_tags.extra_equiv_id = oh->equiv_id;
3379
new_tags.extra_shadows = (oh->shadows_obj > 0) ? 1 : 0;
3380
new_tags.extra_obj_type = in->variant_type;
3381
yaffs_verify_oh(in, oh, &new_tags, 1);
3383
/* Create new chunk in NAND */
3385
yaffs_write_new_chunk(dev, buffer, &new_tags,
3386
(prev_chunk_id > 0) ? 1 : 0);
3389
yaffs_release_temp_buffer(dev, buffer);
3391
if (new_chunk_id < 0)
3392
return new_chunk_id;
3394
in->hdr_chunk = new_chunk_id;
3396
if (prev_chunk_id > 0)
3397
yaffs_chunk_del(dev, prev_chunk_id, 1, __LINE__);
3399
if (!yaffs_obj_cache_dirty(in))
3402
/* If this was a shrink, then mark the block
3403
* that the chunk lives on */
3405
bi = yaffs_get_block_info(in->my_dev,
3407
in->my_dev->param.chunks_per_block);
3408
bi->has_shrink_hdr = 1;
3412
return new_chunk_id;
3415
/*--------------------- File read/write ------------------------
3416
* Read and write have very similar structures.
3417
* In general the read/write has three parts to it
3418
* An incomplete chunk to start with (if the read/write is not chunk-aligned)
3419
* Some complete chunks
3420
* An incomplete chunk to end off with
3422
* Curve-balls: the first chunk might also be the last chunk.
3425
int yaffs_file_rd(struct yaffs_obj *in, u8 * buffer, loff_t offset, int n_bytes)
3432
struct yaffs_cache *cache;
3433
struct yaffs_dev *dev;
3438
yaffs_addr_to_chunk(dev, offset, &chunk, &start);
3441
/* OK now check for the curveball where the start and end are in
3444
if ((start + n) < dev->data_bytes_per_chunk)
3447
n_copy = dev->data_bytes_per_chunk - start;
3449
cache = yaffs_find_chunk_cache(in, chunk);
3451
/* If the chunk is already in the cache or it is less than
3452
* a whole chunk or we're using inband tags then use the cache
3453
* (if there is caching) else bypass the cache.
3455
if (cache || n_copy != dev->data_bytes_per_chunk ||
3456
dev->param.inband_tags) {
3457
if (dev->param.n_caches > 0) {
3459
/* If we can't find the data in the cache,
3460
* then load it up. */
3464
yaffs_grab_chunk_cache(in->my_dev);
3466
cache->chunk_id = chunk;
3469
yaffs_rd_data_obj(in, chunk,
3474
yaffs_use_cache(dev, cache, 0);
3478
memcpy(buffer, &cache->data[start], n_copy);
3482
/* Read into the local buffer then copy.. */
3485
yaffs_get_temp_buffer(dev);
3486
yaffs_rd_data_obj(in, chunk, local_buffer);
3488
memcpy(buffer, &local_buffer[start], n_copy);
3490
yaffs_release_temp_buffer(dev, local_buffer);
3493
/* A full chunk. Read directly into the buffer. */
3494
yaffs_rd_data_obj(in, chunk, buffer);
3504
int yaffs_do_file_wr(struct yaffs_obj *in, const u8 *buffer, loff_t offset,
3505
int n_bytes, int write_through)
3514
loff_t start_write = offset;
3515
int chunk_written = 0;
3518
struct yaffs_dev *dev;
3522
while (n > 0 && chunk_written >= 0) {
3523
yaffs_addr_to_chunk(dev, offset, &chunk, &start);
3525
if (((loff_t)chunk) *
3526
dev->data_bytes_per_chunk + start != offset ||
3527
start >= dev->data_bytes_per_chunk) {
3528
yaffs_trace(YAFFS_TRACE_ERROR,
3529
"AddrToChunk of offset %lld gives chunk %d start %d",
3530
offset, chunk, start);
3532
chunk++; /* File pos to chunk in file offset */
3534
/* OK now check for the curveball where the start and end are in
3538
if ((start + n) < dev->data_bytes_per_chunk) {
3541
/* Now calculate how many bytes to write back....
3542
* If we're overwriting and not writing to then end of
3543
* file then we need to write back as much as was there
3547
chunk_start = (((loff_t)(chunk - 1)) *
3548
dev->data_bytes_per_chunk);
3550
if (chunk_start > in->variant.file_variant.file_size)
3551
n_bytes_read = 0; /* Past end of file */
3554
in->variant.file_variant.file_size -
3557
if (n_bytes_read > dev->data_bytes_per_chunk)
3558
n_bytes_read = dev->data_bytes_per_chunk;
3562
(start + n)) ? n_bytes_read : (start + n);
3564
if (n_writeback < 0 ||
3565
n_writeback > dev->data_bytes_per_chunk)
3569
n_copy = dev->data_bytes_per_chunk - start;
3570
n_writeback = dev->data_bytes_per_chunk;
3573
if (n_copy != dev->data_bytes_per_chunk ||
3574
dev->param.inband_tags) {
3575
/* An incomplete start or end chunk (or maybe both
3576
* start and end chunk), or we're using inband tags,
3577
* so we want to use the cache buffers.
3579
if (dev->param.n_caches > 0) {
3580
struct yaffs_cache *cache;
3582
/* If we can't find the data in the cache, then
3584
cache = yaffs_find_chunk_cache(in, chunk);
3587
yaffs_check_alloc_available(dev, 1)) {
3588
cache = yaffs_grab_chunk_cache(dev);
3590
cache->chunk_id = chunk;
3593
yaffs_rd_data_obj(in, chunk,
3597
!yaffs_check_alloc_available(dev,
3599
/* Drop the cache if it was a read cache
3600
* item and no space check has been made
3607
yaffs_use_cache(dev, cache, 1);
3610
memcpy(&cache->data[start], buffer,
3614
cache->n_bytes = n_writeback;
3616
if (write_through) {
3626
chunk_written = -1; /* fail write */
3629
/* An incomplete start or end chunk (or maybe
3630
* both start and end chunk). Read into the
3631
* local buffer then copy over and write back.
3634
u8 *local_buffer = yaffs_get_temp_buffer(dev);
3636
yaffs_rd_data_obj(in, chunk, local_buffer);
3637
memcpy(&local_buffer[start], buffer, n_copy);
3640
yaffs_wr_data_obj(in, chunk,
3644
yaffs_release_temp_buffer(dev, local_buffer);
3647
/* A full chunk. Write directly from the buffer. */
3650
yaffs_wr_data_obj(in, chunk, buffer,
3651
dev->data_bytes_per_chunk, 0);
3653
/* Since we've overwritten the cached data,
3654
* we better invalidate it. */
3655
yaffs_invalidate_chunk_cache(in, chunk);
3658
if (chunk_written >= 0) {
3666
/* Update file object */
3668
if ((start_write + n_done) > in->variant.file_variant.file_size)
3669
in->variant.file_variant.file_size = (start_write + n_done);
3675
int yaffs_wr_file(struct yaffs_obj *in, const u8 *buffer, loff_t offset,
3676
int n_bytes, int write_through)
3678
yaffs2_handle_hole(in, offset);
3679
return yaffs_do_file_wr(in, buffer, offset, n_bytes, write_through);
3682
/* ---------------------- File resizing stuff ------------------ */
3684
static void yaffs_prune_chunks(struct yaffs_obj *in, loff_t new_size)
3687
struct yaffs_dev *dev = in->my_dev;
3688
loff_t old_size = in->variant.file_variant.file_size;
3696
yaffs_addr_to_chunk(dev, old_size - 1, &last_del, &dummy);
3700
yaffs_addr_to_chunk(dev, new_size + dev->data_bytes_per_chunk - 1,
3701
&start_del, &dummy);
3705
/* Delete backwards so that we don't end up with holes if
3706
* power is lost part-way through the operation.
3708
for (i = last_del; i >= start_del; i--) {
3709
/* NB this could be optimised somewhat,
3710
* eg. could retrieve the tags and write them without
3711
* using yaffs_chunk_del
3714
chunk_id = yaffs_find_del_file_chunk(in, i, NULL);
3720
(dev->internal_start_block * dev->param.chunks_per_block) ||
3722
((dev->internal_end_block + 1) *
3723
dev->param.chunks_per_block)) {
3724
yaffs_trace(YAFFS_TRACE_ALWAYS,
3725
"Found daft chunk_id %d for %d",
3728
in->n_data_chunks--;
3729
yaffs_chunk_del(dev, chunk_id, 1, __LINE__);
3734
void yaffs_resize_file_down(struct yaffs_obj *obj, loff_t new_size)
3738
struct yaffs_dev *dev = obj->my_dev;
3740
yaffs_addr_to_chunk(dev, new_size, &new_full, &new_partial);
3742
yaffs_prune_chunks(obj, new_size);
3744
if (new_partial != 0) {
3745
int last_chunk = 1 + new_full;
3746
u8 *local_buffer = yaffs_get_temp_buffer(dev);
3748
/* Rewrite the last chunk with its new size and zero pad */
3749
yaffs_rd_data_obj(obj, last_chunk, local_buffer);
3750
memset(local_buffer + new_partial, 0,
3751
dev->data_bytes_per_chunk - new_partial);
3753
yaffs_wr_data_obj(obj, last_chunk, local_buffer,
3756
yaffs_release_temp_buffer(dev, local_buffer);
3759
obj->variant.file_variant.file_size = new_size;
3761
yaffs_prune_tree(dev, &obj->variant.file_variant);
3764
int yaffs_resize_file(struct yaffs_obj *in, loff_t new_size)
3766
struct yaffs_dev *dev = in->my_dev;
3767
loff_t old_size = in->variant.file_variant.file_size;
3769
yaffs_flush_file_cache(in);
3770
yaffs_invalidate_whole_cache(in);
3772
yaffs_check_gc(dev, 0);
3774
if (in->variant_type != YAFFS_OBJECT_TYPE_FILE)
3777
if (new_size == old_size)
3780
if (new_size > old_size) {
3781
yaffs2_handle_hole(in, new_size);
3782
in->variant.file_variant.file_size = new_size;
3784
/* new_size < old_size */
3785
yaffs_resize_file_down(in, new_size);
3788
/* Write a new object header to reflect the resize.
3789
* show we've shrunk the file, if need be
3790
* Do this only if the file is not in the deleted directories
3791
* and is not shadowed.
3795
in->parent->obj_id != YAFFS_OBJECTID_UNLINKED &&
3796
in->parent->obj_id != YAFFS_OBJECTID_DELETED)
3797
yaffs_update_oh(in, NULL, 0, 0, 0, NULL);
3802
int yaffs_flush_file(struct yaffs_obj *in, int update_time, int data_sync)
3807
yaffs_flush_file_cache(in);
3813
yaffs_load_current_time(in, 0, 0);
3815
return (yaffs_update_oh(in, NULL, 0, 0, 0, NULL) >= 0) ?
3816
YAFFS_OK : YAFFS_FAIL;
3820
/* yaffs_del_file deletes the whole file data
3821
* and the inode associated with the file.
3822
* It does not delete the links associated with the file.
3824
static int yaffs_unlink_file_if_needed(struct yaffs_obj *in)
3828
struct yaffs_dev *dev = in->my_dev;
3835
yaffs_change_obj_name(in, in->my_dev->del_dir,
3836
_Y("deleted"), 0, 0);
3837
yaffs_trace(YAFFS_TRACE_TRACING,
3838
"yaffs: immediate deletion of file %d",
3841
in->my_dev->n_deleted_files++;
3842
if (dev->param.disable_soft_del || dev->param.is_yaffs2)
3843
yaffs_resize_file(in, 0);
3844
yaffs_soft_del_file(in);
3847
yaffs_change_obj_name(in, in->my_dev->unlinked_dir,
3848
_Y("unlinked"), 0, 0);
3853
int yaffs_del_file(struct yaffs_obj *in)
3855
int ret_val = YAFFS_OK;
3856
int deleted; /* Need to cache value on stack if in is freed */
3857
struct yaffs_dev *dev = in->my_dev;
3859
if (dev->param.disable_soft_del || dev->param.is_yaffs2)
3860
yaffs_resize_file(in, 0);
3862
if (in->n_data_chunks > 0) {
3863
/* Use soft deletion if there is data in the file.
3864
* That won't be the case if it has been resized to zero.
3867
ret_val = yaffs_unlink_file_if_needed(in);
3869
deleted = in->deleted;
3871
if (ret_val == YAFFS_OK && in->unlinked && !in->deleted) {
3874
in->my_dev->n_deleted_files++;
3875
yaffs_soft_del_file(in);
3877
return deleted ? YAFFS_OK : YAFFS_FAIL;
3879
/* The file has no data chunks so we toss it immediately */
3880
yaffs_free_tnode(in->my_dev, in->variant.file_variant.top);
3881
in->variant.file_variant.top = NULL;
3882
yaffs_generic_obj_del(in);
3888
int yaffs_is_non_empty_dir(struct yaffs_obj *obj)
3891
obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) &&
3892
!(list_empty(&obj->variant.dir_variant.children));
3895
static int yaffs_del_dir(struct yaffs_obj *obj)
3897
/* First check that the directory is empty. */
3898
if (yaffs_is_non_empty_dir(obj))
3901
return yaffs_generic_obj_del(obj);
3904
static int yaffs_del_symlink(struct yaffs_obj *in)
3906
kfree(in->variant.symlink_variant.alias);
3907
in->variant.symlink_variant.alias = NULL;
3909
return yaffs_generic_obj_del(in);
3912
static int yaffs_del_link(struct yaffs_obj *in)
3914
/* remove this hardlink from the list associated with the equivalent
3917
list_del_init(&in->hard_links);
3918
return yaffs_generic_obj_del(in);
3921
int yaffs_del_obj(struct yaffs_obj *obj)
3925
switch (obj->variant_type) {
3926
case YAFFS_OBJECT_TYPE_FILE:
3927
ret_val = yaffs_del_file(obj);
3929
case YAFFS_OBJECT_TYPE_DIRECTORY:
3930
if (!list_empty(&obj->variant.dir_variant.dirty)) {
3931
yaffs_trace(YAFFS_TRACE_BACKGROUND,
3932
"Remove object %d from dirty directories",
3934
list_del_init(&obj->variant.dir_variant.dirty);
3936
return yaffs_del_dir(obj);
3938
case YAFFS_OBJECT_TYPE_SYMLINK:
3939
ret_val = yaffs_del_symlink(obj);
3941
case YAFFS_OBJECT_TYPE_HARDLINK:
3942
ret_val = yaffs_del_link(obj);
3944
case YAFFS_OBJECT_TYPE_SPECIAL:
3945
ret_val = yaffs_generic_obj_del(obj);
3947
case YAFFS_OBJECT_TYPE_UNKNOWN:
3949
break; /* should not happen. */
3954
static int yaffs_unlink_worker(struct yaffs_obj *obj)
3964
yaffs_update_parent(obj->parent);
3966
if (obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) {
3967
return yaffs_del_link(obj);
3968
} else if (!list_empty(&obj->hard_links)) {
3969
/* Curve ball: We're unlinking an object that has a hardlink.
3971
* This problem arises because we are not strictly following
3972
* The Linux link/inode model.
3974
* We can't really delete the object.
3975
* Instead, we do the following:
3976
* - Select a hardlink.
3977
* - Unhook it from the hard links
3978
* - Move it from its parent directory so that the rename works.
3979
* - Rename the object to the hardlink's name.
3980
* - Delete the hardlink
3983
struct yaffs_obj *hl;
3984
struct yaffs_obj *parent;
3986
YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
3988
hl = list_entry(obj->hard_links.next, struct yaffs_obj,
3991
yaffs_get_obj_name(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
3992
parent = hl->parent;
3994
list_del_init(&hl->hard_links);
3996
yaffs_add_obj_to_dir(obj->my_dev->unlinked_dir, hl);
3998
ret_val = yaffs_change_obj_name(obj, parent, name, 0, 0);
4000
if (ret_val == YAFFS_OK)
4001
ret_val = yaffs_generic_obj_del(hl);
4005
} else if (del_now) {
4006
switch (obj->variant_type) {
4007
case YAFFS_OBJECT_TYPE_FILE:
4008
return yaffs_del_file(obj);
4010
case YAFFS_OBJECT_TYPE_DIRECTORY:
4011
list_del_init(&obj->variant.dir_variant.dirty);
4012
return yaffs_del_dir(obj);
4014
case YAFFS_OBJECT_TYPE_SYMLINK:
4015
return yaffs_del_symlink(obj);
4017
case YAFFS_OBJECT_TYPE_SPECIAL:
4018
return yaffs_generic_obj_del(obj);
4020
case YAFFS_OBJECT_TYPE_HARDLINK:
4021
case YAFFS_OBJECT_TYPE_UNKNOWN:
4025
} else if (yaffs_is_non_empty_dir(obj)) {
4028
return yaffs_change_obj_name(obj, obj->my_dev->unlinked_dir,
4029
_Y("unlinked"), 0, 0);
4033
static int yaffs_unlink_obj(struct yaffs_obj *obj)
4035
if (obj && obj->unlink_allowed)
4036
return yaffs_unlink_worker(obj);
4041
int yaffs_unlinker(struct yaffs_obj *dir, const YCHAR *name)
4043
struct yaffs_obj *obj;
4045
obj = yaffs_find_by_name(dir, name);
4046
return yaffs_unlink_obj(obj);
4050
* If old_name is NULL then we take old_dir as the object to be renamed.
4052
int yaffs_rename_obj(struct yaffs_obj *old_dir, const YCHAR *old_name,
4053
struct yaffs_obj *new_dir, const YCHAR *new_name)
4055
struct yaffs_obj *obj = NULL;
4056
struct yaffs_obj *existing_target = NULL;
4059
struct yaffs_dev *dev;
4061
if (!old_dir || old_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
4065
if (!new_dir || new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
4070
dev = old_dir->my_dev;
4072
#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
4073
/* Special case for case insemsitive systems.
4074
* While look-up is case insensitive, the name isn't.
4075
* Therefore we might want to change x.txt to X.txt
4077
if (old_dir == new_dir &&
4078
old_name && new_name &&
4079
yaffs_strcmp(old_name, new_name) == 0)
4083
if (yaffs_strnlen(new_name, YAFFS_MAX_NAME_LENGTH + 1) >
4084
YAFFS_MAX_NAME_LENGTH)
4089
obj = yaffs_find_by_name(old_dir, old_name);
4092
old_dir = obj->parent;
4095
if (obj && obj->rename_allowed) {
4096
/* Now handle an existing target, if there is one */
4097
existing_target = yaffs_find_by_name(new_dir, new_name);
4098
if (yaffs_is_non_empty_dir(existing_target)) {
4099
return YAFFS_FAIL; /* ENOTEMPTY */
4100
} else if (existing_target && existing_target != obj) {
4101
/* Nuke the target first, using shadowing,
4102
* but only if it isn't the same object.
4104
* Note we must disable gc here otherwise it can mess
4108
dev->gc_disable = 1;
4109
yaffs_change_obj_name(obj, new_dir, new_name, force,
4110
existing_target->obj_id);
4111
existing_target->is_shadowed = 1;
4112
yaffs_unlink_obj(existing_target);
4113
dev->gc_disable = 0;
4116
result = yaffs_change_obj_name(obj, new_dir, new_name, 1, 0);
4118
yaffs_update_parent(old_dir);
4119
if (new_dir != old_dir)
4120
yaffs_update_parent(new_dir);
4127
/*----------------------- Initialisation Scanning ---------------------- */
4129
void yaffs_handle_shadowed_obj(struct yaffs_dev *dev, int obj_id,
4130
int backward_scanning)
4132
struct yaffs_obj *obj;
4134
if (backward_scanning) {
4135
/* Handle YAFFS2 case (backward scanning)
4136
* If the shadowed object exists then ignore.
4138
obj = yaffs_find_by_number(dev, obj_id);
4143
/* Let's create it (if it does not exist) assuming it is a file so that
4144
* it can do shrinking etc.
4145
* We put it in unlinked dir to be cleaned up after the scanning
4148
yaffs_find_or_create_by_number(dev, obj_id, YAFFS_OBJECT_TYPE_FILE);
4151
obj->is_shadowed = 1;
4152
yaffs_add_obj_to_dir(dev->unlinked_dir, obj);
4153
obj->variant.file_variant.shrink_size = 0;
4154
obj->valid = 1; /* So that we don't read any other info. */
4157
void yaffs_link_fixup(struct yaffs_dev *dev, struct list_head *hard_list)
4159
struct list_head *lh;
4160
struct list_head *save;
4161
struct yaffs_obj *hl;
4162
struct yaffs_obj *in;
4164
list_for_each_safe(lh, save, hard_list) {
4165
hl = list_entry(lh, struct yaffs_obj, hard_links);
4166
in = yaffs_find_by_number(dev,
4167
hl->variant.hardlink_variant.equiv_id);
4170
/* Add the hardlink pointers */
4171
hl->variant.hardlink_variant.equiv_obj = in;
4172
list_add(&hl->hard_links, &in->hard_links);
4174
/* Todo Need to report/handle this better.
4175
* Got a problem... hardlink to a non-existant object
4177
hl->variant.hardlink_variant.equiv_obj = NULL;
4178
INIT_LIST_HEAD(&hl->hard_links);
4183
static void yaffs_strip_deleted_objs(struct yaffs_dev *dev)
4186
* Sort out state of unlinked and deleted objects after scanning.
4188
struct list_head *i;
4189
struct list_head *n;
4190
struct yaffs_obj *l;
4195
/* Soft delete all the unlinked files */
4196
list_for_each_safe(i, n,
4197
&dev->unlinked_dir->variant.dir_variant.children) {
4198
l = list_entry(i, struct yaffs_obj, siblings);
4202
list_for_each_safe(i, n, &dev->del_dir->variant.dir_variant.children) {
4203
l = list_entry(i, struct yaffs_obj, siblings);
4209
* This code iterates through all the objects making sure that they are rooted.
4210
* Any unrooted objects are re-rooted in lost+found.
4211
* An object needs to be in one of:
4212
* - Directly under deleted, unlinked
4213
* - Directly or indirectly under root.
4216
* This code assumes that we don't ever change the current relationships
4217
* between directories:
4218
* root_dir->parent == unlinked_dir->parent == del_dir->parent == NULL
4219
* lost-n-found->parent == root_dir
4221
* This fixes the problem where directories might have inadvertently been
4222
* deleted leaving the object "hanging" without being rooted in the
4226
static int yaffs_has_null_parent(struct yaffs_dev *dev, struct yaffs_obj *obj)
4228
return (obj == dev->del_dir ||
4229
obj == dev->unlinked_dir || obj == dev->root_dir);
4232
static void yaffs_fix_hanging_objs(struct yaffs_dev *dev)
4234
struct yaffs_obj *obj;
4235
struct yaffs_obj *parent;
4237
struct list_head *lh;
4238
struct list_head *n;
4245
/* Iterate through the objects in each hash entry,
4246
* looking at each object.
4247
* Make sure it is rooted.
4250
for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
4251
list_for_each_safe(lh, n, &dev->obj_bucket[i].list) {
4252
obj = list_entry(lh, struct yaffs_obj, hash_link);
4253
parent = obj->parent;
4255
if (yaffs_has_null_parent(dev, obj)) {
4256
/* These directories are not hanging */
4258
} else if (!parent ||
4259
parent->variant_type !=
4260
YAFFS_OBJECT_TYPE_DIRECTORY) {
4262
} else if (yaffs_has_null_parent(dev, parent)) {
4266
* Need to follow the parent chain to
4267
* see if it is hanging.
4272
while (parent != dev->root_dir &&
4274
parent->parent->variant_type ==
4275
YAFFS_OBJECT_TYPE_DIRECTORY &&
4277
parent = parent->parent;
4280
if (parent != dev->root_dir)
4284
yaffs_trace(YAFFS_TRACE_SCAN,
4285
"Hanging object %d moved to lost and found",
4287
yaffs_add_obj_to_dir(dev->lost_n_found, obj);
4294
* Delete directory contents for cleaning up lost and found.
4296
static void yaffs_del_dir_contents(struct yaffs_obj *dir)
4298
struct yaffs_obj *obj;
4299
struct list_head *lh;
4300
struct list_head *n;
4302
if (dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
4305
list_for_each_safe(lh, n, &dir->variant.dir_variant.children) {
4306
obj = list_entry(lh, struct yaffs_obj, siblings);
4307
if (obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY)
4308
yaffs_del_dir_contents(obj);
4309
yaffs_trace(YAFFS_TRACE_SCAN,
4310
"Deleting lost_found object %d",
4312
yaffs_unlink_obj(obj);
4316
static void yaffs_empty_l_n_f(struct yaffs_dev *dev)
4318
yaffs_del_dir_contents(dev->lost_n_found);
4322
struct yaffs_obj *yaffs_find_by_name(struct yaffs_obj *directory,
4326
struct list_head *i;
4327
YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
4328
struct yaffs_obj *l;
4334
yaffs_trace(YAFFS_TRACE_ALWAYS,
4335
"tragedy: yaffs_find_by_name: null pointer directory"
4340
if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
4341
yaffs_trace(YAFFS_TRACE_ALWAYS,
4342
"tragedy: yaffs_find_by_name: non-directory"
4347
sum = yaffs_calc_name_sum(name);
4349
list_for_each(i, &directory->variant.dir_variant.children) {
4350
l = list_entry(i, struct yaffs_obj, siblings);
4352
if (l->parent != directory)
4355
yaffs_check_obj_details_loaded(l);
4357
/* Special case for lost-n-found */
4358
if (l->obj_id == YAFFS_OBJECTID_LOSTNFOUND) {
4359
if (!yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME))
4361
} else if (l->sum == sum || l->hdr_chunk <= 0) {
4362
/* LostnFound chunk called Objxxx
4365
yaffs_get_obj_name(l, buffer,
4366
YAFFS_MAX_NAME_LENGTH + 1);
4367
if (!yaffs_strncmp(name, buffer, YAFFS_MAX_NAME_LENGTH))
4374
/* GetEquivalentObject dereferences any hard links to get to the
4378
struct yaffs_obj *yaffs_get_equivalent_obj(struct yaffs_obj *obj)
4380
if (obj && obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) {
4381
obj = obj->variant.hardlink_variant.equiv_obj;
4382
yaffs_check_obj_details_loaded(obj);
4388
* A note or two on object names.
4389
* * If the object name is missing, we then make one up in the form objnnn
4391
* * ASCII names are stored in the object header's name field from byte zero
4392
* * Unicode names are historically stored starting from byte zero.
4394
* Then there are automatic Unicode names...
4395
* The purpose of these is to save names in a way that can be read as
4396
* ASCII or Unicode names as appropriate, thus allowing a Unicode and ASCII
4397
* system to share files.
4399
* These automatic unicode are stored slightly differently...
4400
* - If the name can fit in the ASCII character space then they are saved as
4401
* ascii names as per above.
4402
* - If the name needs Unicode then the name is saved in Unicode
4403
* starting at oh->name[1].
4406
static void yaffs_fix_null_name(struct yaffs_obj *obj, YCHAR *name,
4409
/* Create an object name if we could not find one. */
4410
if (yaffs_strnlen(name, YAFFS_MAX_NAME_LENGTH) == 0) {
4411
YCHAR local_name[20];
4412
YCHAR num_string[20];
4413
YCHAR *x = &num_string[19];
4414
unsigned v = obj->obj_id;
4418
*x = '0' + (v % 10);
4421
/* make up a name */
4422
yaffs_strcpy(local_name, YAFFS_LOSTNFOUND_PREFIX);
4423
yaffs_strcat(local_name, x);
4424
yaffs_strncpy(name, local_name, buffer_size - 1);
4428
int yaffs_get_obj_name(struct yaffs_obj *obj, YCHAR *name, int buffer_size)
4430
memset(name, 0, buffer_size * sizeof(YCHAR));
4431
yaffs_check_obj_details_loaded(obj);
4432
if (obj->obj_id == YAFFS_OBJECTID_LOSTNFOUND) {
4433
yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffer_size - 1);
4434
} else if (obj->short_name[0]) {
4435
yaffs_strcpy(name, obj->short_name);
4436
} else if (obj->hdr_chunk > 0) {
4437
u8 *buffer = yaffs_get_temp_buffer(obj->my_dev);
4439
struct yaffs_obj_hdr *oh = (struct yaffs_obj_hdr *)buffer;
4441
memset(buffer, 0, obj->my_dev->data_bytes_per_chunk);
4443
if (obj->hdr_chunk > 0) {
4444
yaffs_rd_chunk_tags_nand(obj->my_dev,
4448
yaffs_load_name_from_oh(obj->my_dev, name, oh->name,
4451
yaffs_release_temp_buffer(obj->my_dev, buffer);
4454
yaffs_fix_null_name(obj, name, buffer_size);
4456
return yaffs_strnlen(name, YAFFS_MAX_NAME_LENGTH);
4459
loff_t yaffs_get_obj_length(struct yaffs_obj *obj)
4461
/* Dereference any hard linking */
4462
obj = yaffs_get_equivalent_obj(obj);
4464
if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE)
4465
return obj->variant.file_variant.file_size;
4466
if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) {
4467
if (!obj->variant.symlink_variant.alias)
4469
return yaffs_strnlen(obj->variant.symlink_variant.alias,
4470
YAFFS_MAX_ALIAS_LENGTH);
4472
/* Only a directory should drop through to here */
4473
return obj->my_dev->data_bytes_per_chunk;
4477
int yaffs_get_obj_link_count(struct yaffs_obj *obj)
4480
struct list_head *i;
4483
count++; /* the object itself */
4485
list_for_each(i, &obj->hard_links)
4486
count++; /* add the hard links; */
4491
int yaffs_get_obj_inode(struct yaffs_obj *obj)
4493
obj = yaffs_get_equivalent_obj(obj);
4498
unsigned yaffs_get_obj_type(struct yaffs_obj *obj)
4500
obj = yaffs_get_equivalent_obj(obj);
4502
switch (obj->variant_type) {
4503
case YAFFS_OBJECT_TYPE_FILE:
4506
case YAFFS_OBJECT_TYPE_DIRECTORY:
4509
case YAFFS_OBJECT_TYPE_SYMLINK:
4512
case YAFFS_OBJECT_TYPE_HARDLINK:
4515
case YAFFS_OBJECT_TYPE_SPECIAL:
4516
if (S_ISFIFO(obj->yst_mode))
4518
if (S_ISCHR(obj->yst_mode))
4520
if (S_ISBLK(obj->yst_mode))
4522
if (S_ISSOCK(obj->yst_mode))
4532
YCHAR *yaffs_get_symlink_alias(struct yaffs_obj *obj)
4534
obj = yaffs_get_equivalent_obj(obj);
4535
if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK)
4536
return yaffs_clone_str(obj->variant.symlink_variant.alias);
4538
return yaffs_clone_str(_Y(""));
4541
/*--------------------------- Initialisation code -------------------------- */
4543
static int yaffs_check_dev_fns(const struct yaffs_dev *dev)
4545
/* Common functions, gotta have */
4546
if (!dev->param.erase_fn || !dev->param.initialise_flash_fn)
4549
/* Can use the "with tags" style interface for yaffs1 or yaffs2 */
4550
if (dev->param.write_chunk_tags_fn &&
4551
dev->param.read_chunk_tags_fn &&
4552
!dev->param.write_chunk_fn &&
4553
!dev->param.read_chunk_fn &&
4554
dev->param.bad_block_fn && dev->param.query_block_fn)
4557
/* Can use the "spare" style interface for yaffs1 */
4558
if (!dev->param.is_yaffs2 &&
4559
!dev->param.write_chunk_tags_fn &&
4560
!dev->param.read_chunk_tags_fn &&
4561
dev->param.write_chunk_fn &&
4562
dev->param.read_chunk_fn &&
4563
!dev->param.bad_block_fn && !dev->param.query_block_fn)
4569
static int yaffs_create_initial_dir(struct yaffs_dev *dev)
4571
/* Initialise the unlinked, deleted, root and lost+found directories */
4572
dev->lost_n_found = dev->root_dir = NULL;
4573
dev->unlinked_dir = dev->del_dir = NULL;
4575
yaffs_create_fake_dir(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
4577
yaffs_create_fake_dir(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
4579
yaffs_create_fake_dir(dev, YAFFS_OBJECTID_ROOT,
4580
YAFFS_ROOT_MODE | S_IFDIR);
4582
yaffs_create_fake_dir(dev, YAFFS_OBJECTID_LOSTNFOUND,
4583
YAFFS_LOSTNFOUND_MODE | S_IFDIR);
4585
if (dev->lost_n_found && dev->root_dir && dev->unlinked_dir
4587
yaffs_add_obj_to_dir(dev->root_dir, dev->lost_n_found);
4593
int yaffs_guts_initialise(struct yaffs_dev *dev)
4595
int init_failed = 0;
4599
yaffs_trace(YAFFS_TRACE_TRACING, "yaffs: yaffs_guts_initialise()");
4601
/* Check stuff that must be set */
4604
yaffs_trace(YAFFS_TRACE_ALWAYS,
4605
"yaffs: Need a device"
4610
if (dev->is_mounted) {
4611
yaffs_trace(YAFFS_TRACE_ALWAYS, "device already mounted");
4615
dev->internal_start_block = dev->param.start_block;
4616
dev->internal_end_block = dev->param.end_block;
4617
dev->block_offset = 0;
4618
dev->chunk_offset = 0;
4619
dev->n_free_chunks = 0;
4623
if (dev->param.start_block == 0) {
4624
dev->internal_start_block = dev->param.start_block + 1;
4625
dev->internal_end_block = dev->param.end_block + 1;
4626
dev->block_offset = 1;
4627
dev->chunk_offset = dev->param.chunks_per_block;
4630
/* Check geometry parameters. */
4632
if ((!dev->param.inband_tags && dev->param.is_yaffs2 &&
4633
dev->param.total_bytes_per_chunk < 1024) ||
4634
(!dev->param.is_yaffs2 &&
4635
dev->param.total_bytes_per_chunk < 512) ||
4636
(dev->param.inband_tags && !dev->param.is_yaffs2) ||
4637
dev->param.chunks_per_block < 2 ||
4638
dev->param.n_reserved_blocks < 2 ||
4639
dev->internal_start_block <= 0 ||
4640
dev->internal_end_block <= 0 ||
4641
dev->internal_end_block <=
4642
(dev->internal_start_block + dev->param.n_reserved_blocks + 2)
4644
/* otherwise it is too small */
4645
yaffs_trace(YAFFS_TRACE_ALWAYS,
4646
"NAND geometry problems: chunk size %d, type is yaffs%s, inband_tags %d ",
4647
dev->param.total_bytes_per_chunk,
4648
dev->param.is_yaffs2 ? "2" : "",
4649
dev->param.inband_tags);
4653
if (yaffs_init_nand(dev) != YAFFS_OK) {
4654
yaffs_trace(YAFFS_TRACE_ALWAYS, "InitialiseNAND failed");
4658
/* Sort out space for inband tags, if required */
4659
if (dev->param.inband_tags)
4660
dev->data_bytes_per_chunk =
4661
dev->param.total_bytes_per_chunk -
4662
sizeof(struct yaffs_packed_tags2_tags_only);
4664
dev->data_bytes_per_chunk = dev->param.total_bytes_per_chunk;
4666
/* Got the right mix of functions? */
4667
if (!yaffs_check_dev_fns(dev)) {
4668
/* Function missing */
4669
yaffs_trace(YAFFS_TRACE_ALWAYS,
4670
"device function(s) missing or wrong");
4675
/* Finished with most checks. Further checks happen later on too. */
4677
dev->is_mounted = 1;
4679
/* OK now calculate a few things for the device */
4682
* Calculate all the chunk size manipulation numbers:
4684
x = dev->data_bytes_per_chunk;
4685
/* We always use dev->chunk_shift and dev->chunk_div */
4686
dev->chunk_shift = calc_shifts(x);
4687
x >>= dev->chunk_shift;
4689
/* We only use chunk mask if chunk_div is 1 */
4690
dev->chunk_mask = (1 << dev->chunk_shift) - 1;
4693
* Calculate chunk_grp_bits.
4694
* We need to find the next power of 2 > than internal_end_block
4697
x = dev->param.chunks_per_block * (dev->internal_end_block + 1);
4699
bits = calc_shifts_ceiling(x);
4701
/* Set up tnode width if wide tnodes are enabled. */
4702
if (!dev->param.wide_tnodes_disabled) {
4703
/* bits must be even so that we end up with 32-bit words */
4707
dev->tnode_width = 16;
4709
dev->tnode_width = bits;
4711
dev->tnode_width = 16;
4714
dev->tnode_mask = (1 << dev->tnode_width) - 1;
4716
/* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
4717
* so if the bitwidth of the
4718
* chunk range we're using is greater than 16 we need
4719
* to figure out chunk shift and chunk_grp_size
4722
if (bits <= dev->tnode_width)
4723
dev->chunk_grp_bits = 0;
4725
dev->chunk_grp_bits = bits - dev->tnode_width;
4727
dev->tnode_size = (dev->tnode_width * YAFFS_NTNODES_LEVEL0) / 8;
4728
if (dev->tnode_size < sizeof(struct yaffs_tnode))
4729
dev->tnode_size = sizeof(struct yaffs_tnode);
4731
dev->chunk_grp_size = 1 << dev->chunk_grp_bits;
4733
if (dev->param.chunks_per_block < dev->chunk_grp_size) {
4734
/* We have a problem because the soft delete won't work if
4735
* the chunk group size > chunks per block.
4736
* This can be remedied by using larger "virtual blocks".
4738
yaffs_trace(YAFFS_TRACE_ALWAYS, "chunk group too large");
4743
/* Finished verifying the device, continue with initialisation */
4745
/* More device initialisation */
4747
dev->passive_gc_count = 0;
4748
dev->oldest_dirty_gc_count = 0;
4750
dev->gc_block_finder = 0;
4751
dev->buffered_block = -1;
4752
dev->doing_buffered_block_rewrite = 0;
4753
dev->n_deleted_files = 0;
4754
dev->n_bg_deletions = 0;
4755
dev->n_unlinked_files = 0;
4756
dev->n_ecc_fixed = 0;
4757
dev->n_ecc_unfixed = 0;
4758
dev->n_tags_ecc_fixed = 0;
4759
dev->n_tags_ecc_unfixed = 0;
4760
dev->n_erase_failures = 0;
4761
dev->n_erased_blocks = 0;
4762
dev->gc_disable = 0;
4763
dev->has_pending_prioritised_gc = 1;
4764
/* Assume the worst for now, will get fixed on first GC */
4765
INIT_LIST_HEAD(&dev->dirty_dirs);
4766
dev->oldest_dirty_seq = 0;
4767
dev->oldest_dirty_block = 0;
4769
/* Initialise temporary buffers and caches. */
4770
if (!yaffs_init_tmp_buffers(dev))
4774
dev->gc_cleanup_list = NULL;
4776
if (!init_failed && dev->param.n_caches > 0) {
4780
dev->param.n_caches * sizeof(struct yaffs_cache);
4782
if (dev->param.n_caches > YAFFS_MAX_SHORT_OP_CACHES)
4783
dev->param.n_caches = YAFFS_MAX_SHORT_OP_CACHES;
4785
dev->cache = kmalloc(cache_bytes, GFP_NOFS);
4787
buf = (u8 *) dev->cache;
4790
memset(dev->cache, 0, cache_bytes);
4792
for (i = 0; i < dev->param.n_caches && buf; i++) {
4793
dev->cache[i].object = NULL;
4794
dev->cache[i].last_use = 0;
4795
dev->cache[i].dirty = 0;
4796
dev->cache[i].data = buf =
4797
kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS);
4802
dev->cache_last_use = 0;
4805
dev->cache_hits = 0;
4808
dev->gc_cleanup_list =
4809
kmalloc(dev->param.chunks_per_block * sizeof(u32),
4811
if (!dev->gc_cleanup_list)
4815
if (dev->param.is_yaffs2)
4816
dev->param.use_header_file_size = 1;
4818
if (!init_failed && !yaffs_init_blocks(dev))
4821
yaffs_init_tnodes_and_objs(dev);
4823
if (!init_failed && !yaffs_create_initial_dir(dev))
4826
if (!init_failed && dev->param.is_yaffs2 &&
4827
!dev->param.disable_summary &&
4828
!yaffs_summary_init(dev))
4832
/* Now scan the flash. */
4833
if (dev->param.is_yaffs2) {
4834
if (yaffs2_checkpt_restore(dev)) {
4835
yaffs_check_obj_details_loaded(dev->root_dir);
4836
yaffs_trace(YAFFS_TRACE_CHECKPOINT |
4838
"yaffs: restored from checkpoint"
4842
/* Clean up the mess caused by an aborted
4843
* checkpoint load then scan backwards.
4845
yaffs_deinit_blocks(dev);
4847
yaffs_deinit_tnodes_and_objs(dev);
4849
dev->n_erased_blocks = 0;
4850
dev->n_free_chunks = 0;
4851
dev->alloc_block = -1;
4852
dev->alloc_page = -1;
4853
dev->n_deleted_files = 0;
4854
dev->n_unlinked_files = 0;
4855
dev->n_bg_deletions = 0;
4857
if (!init_failed && !yaffs_init_blocks(dev))
4860
yaffs_init_tnodes_and_objs(dev);
4863
&& !yaffs_create_initial_dir(dev))
4866
if (!init_failed && !yaffs2_scan_backwards(dev))
4869
} else if (!yaffs1_scan(dev)) {
4873
yaffs_strip_deleted_objs(dev);
4874
yaffs_fix_hanging_objs(dev);
4875
if (dev->param.empty_lost_n_found)
4876
yaffs_empty_l_n_f(dev);
4880
/* Clean up the mess */
4881
yaffs_trace(YAFFS_TRACE_TRACING,
4882
"yaffs: yaffs_guts_initialise() aborted.");
4884
yaffs_deinitialise(dev);
4888
/* Zero out stats */
4889
dev->n_page_reads = 0;
4890
dev->n_page_writes = 0;
4891
dev->n_erasures = 0;
4892
dev->n_gc_copies = 0;
4893
dev->n_retried_writes = 0;
4895
dev->n_retired_blocks = 0;
4897
yaffs_verify_free_chunks(dev);
4898
yaffs_verify_blocks(dev);
4900
/* Clean up any aborted checkpoint data */
4901
if (!dev->is_checkpointed && dev->blocks_in_checkpt > 0)
4902
yaffs2_checkpt_invalidate(dev);
4904
yaffs_trace(YAFFS_TRACE_TRACING,
4905
"yaffs: yaffs_guts_initialise() done.");
4909
void yaffs_deinitialise(struct yaffs_dev *dev)
4911
if (dev->is_mounted) {
4914
yaffs_deinit_blocks(dev);
4915
yaffs_deinit_tnodes_and_objs(dev);
4916
yaffs_summary_deinit(dev);
4918
if (dev->param.n_caches > 0 && dev->cache) {
4920
for (i = 0; i < dev->param.n_caches; i++) {
4921
kfree(dev->cache[i].data);
4922
dev->cache[i].data = NULL;
4929
kfree(dev->gc_cleanup_list);
4931
for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
4932
kfree(dev->temp_buffer[i].buffer);
4934
dev->is_mounted = 0;
4936
if (dev->param.deinitialise_flash_fn)
4937
dev->param.deinitialise_flash_fn(dev);
4941
int yaffs_count_free_chunks(struct yaffs_dev *dev)
4945
struct yaffs_block_info *blk;
4947
blk = dev->block_info;
4948
for (b = dev->internal_start_block; b <= dev->internal_end_block; b++) {
4949
switch (blk->block_state) {
4950
case YAFFS_BLOCK_STATE_EMPTY:
4951
case YAFFS_BLOCK_STATE_ALLOCATING:
4952
case YAFFS_BLOCK_STATE_COLLECTING:
4953
case YAFFS_BLOCK_STATE_FULL:
4955
(dev->param.chunks_per_block - blk->pages_in_use +
4956
blk->soft_del_pages);
4966
int yaffs_get_n_free_chunks(struct yaffs_dev *dev)
4968
/* This is what we report to the outside world */
4971
int blocks_for_checkpt;
4974
n_free = dev->n_free_chunks;
4975
n_free += dev->n_deleted_files;
4977
/* Now count and subtract the number of dirty chunks in the cache. */
4979
for (n_dirty_caches = 0, i = 0; i < dev->param.n_caches; i++) {
4980
if (dev->cache[i].dirty)
4984
n_free -= n_dirty_caches;
4987
((dev->param.n_reserved_blocks + 1) * dev->param.chunks_per_block);
4989
/* Now figure checkpoint space and report that... */
4990
blocks_for_checkpt = yaffs_calc_checkpt_blocks_required(dev);
4992
n_free -= (blocks_for_checkpt * dev->param.chunks_per_block);
5001
* Marshalling functions to get loff_t file sizes into aand out of
5004
void yaffs_oh_size_load(struct yaffs_obj_hdr *oh, loff_t fsize)
5006
oh->file_size_low = (fsize & 0xFFFFFFFF);
5007
oh->file_size_high = ((fsize >> 32) & 0xFFFFFFFF);
5010
loff_t yaffs_oh_to_size(struct yaffs_obj_hdr *oh)
5014
if (~(oh->file_size_high))
5015
retval = (((loff_t) oh->file_size_high) << 32) |
5016
(((loff_t) oh->file_size_low) & 0xFFFFFFFF);
5018
retval = (loff_t) oh->file_size_low;