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14#include "yportenv.h"
15#include "yaffs_trace.h"
16
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"
31
32
33#define YAFFS_GC_GOOD_ENOUGH 2
34#define YAFFS_GC_PASSIVE_THRESHOLD 4
35
36#include "yaffs_ecc.h"
37
38
39
40static int yaffs_wr_data_obj(struct yaffs_obj *in, int inode_chunk,
41 const u8 *buffer, int n_bytes, int use_reserve);
42
43
44
45
46
47void yaffs_addr_to_chunk(struct yaffs_dev *dev, loff_t addr,
48 int *chunk_out, u32 *offset_out)
49{
50 int chunk;
51 u32 offset;
52
53 chunk = (u32) (addr >> dev->chunk_shift);
54
55 if (dev->chunk_div == 1) {
56
57 offset = (u32) (addr & dev->chunk_mask);
58 } else {
59
60
61 loff_t chunk_base;
62
63 chunk /= dev->chunk_div;
64
65 chunk_base = ((loff_t) chunk) * dev->data_bytes_per_chunk;
66 offset = (u32) (addr - chunk_base);
67 }
68
69 *chunk_out = chunk;
70 *offset_out = offset;
71}
72
73
74
75
76
77
78
79static inline u32 calc_shifts_ceiling(u32 x)
80{
81 int extra_bits;
82 int shifts;
83
84 shifts = extra_bits = 0;
85
86 while (x > 1) {
87 if (x & 1)
88 extra_bits++;
89 x >>= 1;
90 shifts++;
91 }
92
93 if (extra_bits)
94 shifts++;
95
96 return shifts;
97}
98
99
100
101
102static inline u32 calc_shifts(u32 x)
103{
104 u32 shifts;
105
106 shifts = 0;
107
108 if (!x)
109 return 0;
110
111 while (!(x & 1)) {
112 x >>= 1;
113 shifts++;
114 }
115
116 return shifts;
117}
118
119
120
121
122
123static int yaffs_init_tmp_buffers(struct yaffs_dev *dev)
124{
125 int i;
126 u8 *buf = (u8 *) 1;
127
128 memset(dev->temp_buffer, 0, sizeof(dev->temp_buffer));
129
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;
134 }
135
136 return buf ? YAFFS_OK : YAFFS_FAIL;
137}
138
139u8 *yaffs_get_temp_buffer(struct yaffs_dev * dev)
140{
141 int i;
142
143 dev->temp_in_use++;
144 if (dev->temp_in_use > dev->max_temp)
145 dev->max_temp = dev->temp_in_use;
146
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;
151 }
152 }
153
154 yaffs_trace(YAFFS_TRACE_BUFFERS, "Out of temp buffers");
155
156
157
158
159
160 dev->unmanaged_buffer_allocs++;
161 return kmalloc(dev->data_bytes_per_chunk, GFP_NOFS);
162
163}
164
165void yaffs_release_temp_buffer(struct yaffs_dev *dev, u8 *buffer)
166{
167 int i;
168
169 dev->temp_in_use--;
170
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;
174 return;
175 }
176 }
177
178 if (buffer) {
179
180 yaffs_trace(YAFFS_TRACE_BUFFERS,
181 "Releasing unmanaged temp buffer");
182 kfree(buffer);
183 dev->unmanaged_buffer_deallocs++;
184 }
185
186}
187
188
189
190
191int yaffs_is_managed_tmp_buffer(struct yaffs_dev *dev, const u8 *buffer)
192{
193 int i;
194
195 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
196 if (dev->temp_buffer[i].buffer == buffer)
197 return 1;
198 }
199
200 for (i = 0; i < dev->param.n_caches; i++) {
201 if (dev->cache[i].data == buffer)
202 return 1;
203 }
204
205 if (buffer == dev->checkpt_buffer)
206 return 1;
207
208 yaffs_trace(YAFFS_TRACE_ALWAYS,
209 "yaffs: unmaged buffer detected.");
210 return 0;
211}
212
213
214
215
216
217
218static void yaffs_handle_chunk_wr_ok(struct yaffs_dev *dev, int nand_chunk,
219 const u8 *data,
220 const struct yaffs_ext_tags *tags)
221{
222 dev = dev;
223 nand_chunk = nand_chunk;
224 data = data;
225 tags = tags;
226}
227
228static void yaffs_handle_chunk_update(struct yaffs_dev *dev, int nand_chunk,
229 const struct yaffs_ext_tags *tags)
230{
231 dev = dev;
232 nand_chunk = nand_chunk;
233 tags = tags;
234}
235
236void yaffs_handle_chunk_error(struct yaffs_dev *dev,
237 struct yaffs_block_info *bi)
238{
239 if (!bi->gc_prioritise) {
240 bi->gc_prioritise = 1;
241 dev->has_pending_prioritised_gc = 1;
242 bi->chunk_error_strikes++;
243
244 if (bi->chunk_error_strikes > 3) {
245 bi->needs_retiring = 1;
246 yaffs_trace(YAFFS_TRACE_ALWAYS,
247 "yaffs: Block struck out");
248
249 }
250 }
251}
252
253static void yaffs_handle_chunk_wr_error(struct yaffs_dev *dev, int nand_chunk,
254 int erased_ok)
255{
256 int flash_block = nand_chunk / dev->param.chunks_per_block;
257 struct yaffs_block_info *bi = yaffs_get_block_info(dev, flash_block);
258
259 yaffs_handle_chunk_error(dev, bi);
260
261 if (erased_ok) {
262
263
264 bi->needs_retiring = 1;
265 yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
266 "**>> Block %d needs retiring", flash_block);
267 }
268
269
270 yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
271 yaffs_skip_rest_of_block(dev);
272}
273
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280
281
282static inline int yaffs_hash_fn(int n)
283{
284 if (n < 0)
285 n = -n;
286 return n % YAFFS_NOBJECT_BUCKETS;
287}
288
289
290
291
292
293
294struct yaffs_obj *yaffs_root(struct yaffs_dev *dev)
295{
296 return dev->root_dir;
297}
298
299struct yaffs_obj *yaffs_lost_n_found(struct yaffs_dev *dev)
300{
301 return dev->lost_n_found;
302}
303
304
305
306
307
308int yaffs_check_ff(u8 *buffer, int n_bytes)
309{
310
311 while (n_bytes--) {
312 if (*buffer != 0xff)
313 return 0;
314 buffer++;
315 }
316 return 1;
317}
318
319static int yaffs_check_chunk_erased(struct yaffs_dev *dev, int nand_chunk)
320{
321 int retval = YAFFS_OK;
322 u8 *data = yaffs_get_temp_buffer(dev);
323 struct yaffs_ext_tags tags;
324
325 yaffs_rd_chunk_tags_nand(dev, nand_chunk, data, &tags);
326
327 if (tags.ecc_result > YAFFS_ECC_RESULT_NO_ERROR)
328 retval = YAFFS_FAIL;
329
330 if (!yaffs_check_ff(data, dev->data_bytes_per_chunk) ||
331 tags.chunk_used) {
332 yaffs_trace(YAFFS_TRACE_NANDACCESS,
333 "Chunk %d not erased", nand_chunk);
334 retval = YAFFS_FAIL;
335 }
336
337 yaffs_release_temp_buffer(dev, data);
338
339 return retval;
340
341}
342
343static int yaffs_verify_chunk_written(struct yaffs_dev *dev,
344 int nand_chunk,
345 const u8 *data,
346 struct yaffs_ext_tags *tags)
347{
348 int retval = YAFFS_OK;
349 struct yaffs_ext_tags temp_tags;
350 u8 *buffer = yaffs_get_temp_buffer(dev);
351
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)
357 retval = YAFFS_FAIL;
358
359 yaffs_release_temp_buffer(dev, buffer);
360
361 return retval;
362}
363
364
365int yaffs_check_alloc_available(struct yaffs_dev *dev, int n_chunks)
366{
367 int reserved_chunks;
368 int reserved_blocks = dev->param.n_reserved_blocks;
369 int checkpt_blocks;
370
371 checkpt_blocks = yaffs_calc_checkpt_blocks_required(dev);
372
373 reserved_chunks =
374 (reserved_blocks + checkpt_blocks) * dev->param.chunks_per_block;
375
376 return (dev->n_free_chunks > (reserved_chunks + n_chunks));
377}
378
379static int yaffs_find_alloc_block(struct yaffs_dev *dev)
380{
381 int i;
382 struct yaffs_block_info *bi;
383
384 if (dev->n_erased_blocks < 1) {
385
386
387
388 yaffs_trace(YAFFS_TRACE_ERROR,
389 "yaffs tragedy: no more erased blocks");
390
391 return -1;
392 }
393
394
395
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;
401 }
402
403 bi = yaffs_get_block_info(dev, dev->alloc_block_finder);
404
405 if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) {
406 bi->block_state = YAFFS_BLOCK_STATE_ALLOCATING;
407 dev->seq_number++;
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;
415 }
416 }
417
418 yaffs_trace(YAFFS_TRACE_ALWAYS,
419 "yaffs tragedy: no more erased blocks, but there should have been %d",
420 dev->n_erased_blocks);
421
422 return -1;
423}
424
425static int yaffs_alloc_chunk(struct yaffs_dev *dev, int use_reserver,
426 struct yaffs_block_info **block_ptr)
427{
428 int ret_val;
429 struct yaffs_block_info *bi;
430
431 if (dev->alloc_block < 0) {
432
433 dev->alloc_block = yaffs_find_alloc_block(dev);
434 dev->alloc_page = 0;
435 }
436
437 if (!use_reserver && !yaffs_check_alloc_available(dev, 1)) {
438
439 return -1;
440 }
441
442 if (dev->n_erased_blocks < dev->param.n_reserved_blocks
443 && dev->alloc_page == 0)
444 yaffs_trace(YAFFS_TRACE_ALLOCATE, "Allocating reserve");
445
446
447 if (dev->alloc_block >= 0) {
448 bi = yaffs_get_block_info(dev, dev->alloc_block);
449
450 ret_val = (dev->alloc_block * dev->param.chunks_per_block) +
451 dev->alloc_page;
452 bi->pages_in_use++;
453 yaffs_set_chunk_bit(dev, dev->alloc_block, dev->alloc_page);
454
455 dev->alloc_page++;
456
457 dev->n_free_chunks--;
458
459
460 if (dev->alloc_page >= dev->param.chunks_per_block) {
461 bi->block_state = YAFFS_BLOCK_STATE_FULL;
462 dev->alloc_block = -1;
463 }
464
465 if (block_ptr)
466 *block_ptr = bi;
467
468 return ret_val;
469 }
470
471 yaffs_trace(YAFFS_TRACE_ERROR,
472 "!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!");
473
474 return -1;
475}
476
477static int yaffs_get_erased_chunks(struct yaffs_dev *dev)
478{
479 int n;
480
481 n = dev->n_erased_blocks * dev->param.chunks_per_block;
482
483 if (dev->alloc_block > 0)
484 n += (dev->param.chunks_per_block - dev->alloc_page);
485
486 return n;
487
488}
489
490
491
492
493
494void yaffs_skip_rest_of_block(struct yaffs_dev *dev)
495{
496 struct yaffs_block_info *bi;
497
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;
503 }
504 }
505}
506
507static int yaffs_write_new_chunk(struct yaffs_dev *dev,
508 const u8 *data,
509 struct yaffs_ext_tags *tags, int use_reserver)
510{
511 int attempts = 0;
512 int write_ok = 0;
513 int chunk;
514
515 yaffs2_checkpt_invalidate(dev);
516
517 do {
518 struct yaffs_block_info *bi = 0;
519 int erased_ok = 0;
520
521 chunk = yaffs_alloc_chunk(dev, use_reserver, &bi);
522 if (chunk < 0) {
523
524 break;
525 }
526
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542
543
544
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549
550
551
552 attempts++;
553
554 if (dev->param.always_check_erased)
555 bi->skip_erased_check = 0;
556
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",
562 chunk);
563
564
565
566
567 yaffs_chunk_del(dev, chunk, 1, __LINE__);
568 yaffs_skip_rest_of_block(dev);
569 continue;
570 }
571 }
572
573 write_ok = yaffs_wr_chunk_tags_nand(dev, chunk, data, tags);
574
575 if (!bi->skip_erased_check)
576 write_ok =
577 yaffs_verify_chunk_written(dev, chunk, data, tags);
578
579 if (write_ok != YAFFS_OK) {
580
581
582 yaffs_handle_chunk_wr_error(dev, chunk, erased_ok);
583 continue;
584 }
585
586 bi->skip_erased_check = 1;
587
588
589 yaffs_handle_chunk_wr_ok(dev, chunk, data, tags);
590
591 } while (write_ok != YAFFS_OK &&
592 (yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts));
593
594 if (!write_ok)
595 chunk = -1;
596
597 if (attempts > 1) {
598 yaffs_trace(YAFFS_TRACE_ERROR,
599 "**>> yaffs write required %d attempts",
600 attempts);
601 dev->n_retried_writes += (attempts - 1);
602 }
603
604 return chunk;
605}
606
607
608
609
610
611static void yaffs_retire_block(struct yaffs_dev *dev, int flash_block)
612{
613 struct yaffs_block_info *bi = yaffs_get_block_info(dev, flash_block);
614
615 yaffs2_checkpt_invalidate(dev);
616
617 yaffs2_clear_oldest_dirty_seq(dev, bi);
618
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",
623 flash_block);
624 } else {
625 struct yaffs_ext_tags tags;
626 int chunk_id =
627 flash_block * dev->param.chunks_per_block;
628
629 u8 *buffer = yaffs_get_temp_buffer(dev);
630
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 -
635 dev->chunk_offset,
636 buffer,
637 &tags) != YAFFS_OK)
638 yaffs_trace(YAFFS_TRACE_ALWAYS,
639 "yaffs: Failed to write bad block marker to block %d",
640 flash_block);
641
642 yaffs_release_temp_buffer(dev, buffer);
643 }
644 }
645
646 bi->block_state = YAFFS_BLOCK_STATE_DEAD;
647 bi->gc_prioritise = 0;
648 bi->needs_retiring = 0;
649
650 dev->n_retired_blocks++;
651}
652
653
654
655static u16 yaffs_calc_name_sum(const YCHAR *name)
656{
657 u16 sum = 0;
658 u16 i = 1;
659
660 if (!name)
661 return 0;
662
663 while ((*name) && i < (YAFFS_MAX_NAME_LENGTH / 2)) {
664
665
666 sum += ((*name) & 0x1f) * i;
667 i++;
668 name++;
669 }
670 return sum;
671}
672
673void yaffs_set_obj_name(struct yaffs_obj *obj, const YCHAR * name)
674{
675 memset(obj->short_name, 0, sizeof(obj->short_name));
676 if (name &&
677 yaffs_strnlen(name, YAFFS_SHORT_NAME_LENGTH + 1) <=
678 YAFFS_SHORT_NAME_LENGTH)
679 yaffs_strcpy(obj->short_name, name);
680 else
681 obj->short_name[0] = _Y('\0');
682 obj->sum = yaffs_calc_name_sum(name);
683}
684
685void yaffs_set_obj_name_from_oh(struct yaffs_obj *obj,
686 const struct yaffs_obj_hdr *oh)
687{
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);
694#else
695 yaffs_set_obj_name(obj, oh->name);
696#endif
697}
698
699loff_t yaffs_max_file_size(struct yaffs_dev *dev)
700{
701 return ((loff_t) YAFFS_MAX_CHUNK_ID) * dev->data_bytes_per_chunk;
702}
703
704
705
706
707
708
709
710
711struct yaffs_tnode *yaffs_get_tnode(struct yaffs_dev *dev)
712{
713 struct yaffs_tnode *tn = yaffs_alloc_raw_tnode(dev);
714
715 if (tn) {
716 memset(tn, 0, dev->tnode_size);
717 dev->n_tnodes++;
718 }
719
720 dev->checkpoint_blocks_required = 0;
721
722 return tn;
723}
724
725
726static void yaffs_free_tnode(struct yaffs_dev *dev, struct yaffs_tnode *tn)
727{
728 yaffs_free_raw_tnode(dev, tn);
729 dev->n_tnodes--;
730 dev->checkpoint_blocks_required = 0;
731}
732
733static void yaffs_deinit_tnodes_and_objs(struct yaffs_dev *dev)
734{
735 yaffs_deinit_raw_tnodes_and_objs(dev);
736 dev->n_obj = 0;
737 dev->n_tnodes = 0;
738}
739
740void yaffs_load_tnode_0(struct yaffs_dev *dev, struct yaffs_tnode *tn,
741 unsigned pos, unsigned val)
742{
743 u32 *map = (u32 *) tn;
744 u32 bit_in_map;
745 u32 bit_in_word;
746 u32 word_in_map;
747 u32 mask;
748
749 pos &= YAFFS_TNODES_LEVEL0_MASK;
750 val >>= dev->chunk_grp_bits;
751
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);
755
756 mask = dev->tnode_mask << bit_in_word;
757
758 map[word_in_map] &= ~mask;
759 map[word_in_map] |= (mask & (val << bit_in_word));
760
761 if (dev->tnode_width > (32 - bit_in_word)) {
762 bit_in_word = (32 - bit_in_word);
763 word_in_map++;
764 mask =
765 dev->tnode_mask >> bit_in_word;
766 map[word_in_map] &= ~mask;
767 map[word_in_map] |= (mask & (val >> bit_in_word));
768 }
769}
770
771u32 yaffs_get_group_base(struct yaffs_dev *dev, struct yaffs_tnode *tn,
772 unsigned pos)
773{
774 u32 *map = (u32 *) tn;
775 u32 bit_in_map;
776 u32 bit_in_word;
777 u32 word_in_map;
778 u32 val;
779
780 pos &= YAFFS_TNODES_LEVEL0_MASK;
781
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);
785
786 val = map[word_in_map] >> bit_in_word;
787
788 if (dev->tnode_width > (32 - bit_in_word)) {
789 bit_in_word = (32 - bit_in_word);
790 word_in_map++;
791 val |= (map[word_in_map] << bit_in_word);
792 }
793
794 val &= dev->tnode_mask;
795 val <<= dev->chunk_grp_bits;
796
797 return val;
798}
799
800
801
802
803
804
805
806
807
808struct yaffs_tnode *yaffs_find_tnode_0(struct yaffs_dev *dev,
809 struct yaffs_file_var *file_struct,
810 u32 chunk_id)
811{
812 struct yaffs_tnode *tn = file_struct->top;
813 u32 i;
814 int required_depth;
815 int level = file_struct->top_level;
816
817 dev = dev;
818
819
820 if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL)
821 return NULL;
822
823 if (chunk_id > YAFFS_MAX_CHUNK_ID)
824 return NULL;
825
826
827
828 i = chunk_id >> YAFFS_TNODES_LEVEL0_BITS;
829 required_depth = 0;
830 while (i) {
831 i >>= YAFFS_TNODES_INTERNAL_BITS;
832 required_depth++;
833 }
834
835 if (required_depth > file_struct->top_level)
836 return NULL;
837
838
839 while (level > 0 && tn) {
840 tn = tn->internal[(chunk_id >>
841 (YAFFS_TNODES_LEVEL0_BITS +
842 (level - 1) *
843 YAFFS_TNODES_INTERNAL_BITS)) &
844 YAFFS_TNODES_INTERNAL_MASK];
845 level--;
846 }
847
848 return tn;
849}
850
851
852
853
854
855
856
857
858
859
860
861
862
863struct yaffs_tnode *yaffs_add_find_tnode_0(struct yaffs_dev *dev,
864 struct yaffs_file_var *file_struct,
865 u32 chunk_id,
866 struct yaffs_tnode *passed_tn)
867{
868 int required_depth;
869 int i;
870 int l;
871 struct yaffs_tnode *tn;
872 u32 x;
873
874
875 if (file_struct->top_level < 0 ||
876 file_struct->top_level > YAFFS_TNODES_MAX_LEVEL)
877 return NULL;
878
879 if (chunk_id > YAFFS_MAX_CHUNK_ID)
880 return NULL;
881
882
883
884 x = chunk_id >> YAFFS_TNODES_LEVEL0_BITS;
885 required_depth = 0;
886 while (x) {
887 x >>= YAFFS_TNODES_INTERNAL_BITS;
888 required_depth++;
889 }
890
891 if (required_depth > file_struct->top_level) {
892
893 for (i = file_struct->top_level; i < required_depth; i++) {
894
895 tn = yaffs_get_tnode(dev);
896
897 if (tn) {
898 tn->internal[0] = file_struct->top;
899 file_struct->top = tn;
900 file_struct->top_level++;
901 } else {
902 yaffs_trace(YAFFS_TRACE_ERROR,
903 "yaffs: no more tnodes");
904 return NULL;
905 }
906 }
907 }
908
909
910
911 l = file_struct->top_level;
912 tn = file_struct->top;
913
914 if (l > 0) {
915 while (l > 0 && tn) {
916 x = (chunk_id >>
917 (YAFFS_TNODES_LEVEL0_BITS +
918 (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
919 YAFFS_TNODES_INTERNAL_MASK;
920
921 if ((l > 1) && !tn->internal[x]) {
922
923 tn->internal[x] = yaffs_get_tnode(dev);
924 if (!tn->internal[x])
925 return NULL;
926 } else if (l == 1) {
927
928 if (passed_tn) {
929
930 if (tn->internal[x])
931 yaffs_free_tnode(dev,
932 tn->internal[x]);
933 tn->internal[x] = passed_tn;
934
935 } else if (!tn->internal[x]) {
936
937 tn->internal[x] = yaffs_get_tnode(dev);
938 if (!tn->internal[x])
939 return NULL;
940 }
941 }
942
943 tn = tn->internal[x];
944 l--;
945 }
946 } else {
947
948 if (passed_tn) {
949 memcpy(tn, passed_tn,
950 (dev->tnode_width * YAFFS_NTNODES_LEVEL0) / 8);
951 yaffs_free_tnode(dev, passed_tn);
952 }
953 }
954
955 return tn;
956}
957
958static int yaffs_tags_match(const struct yaffs_ext_tags *tags, int obj_id,
959 int chunk_obj)
960{
961 return (tags->chunk_id == chunk_obj &&
962 tags->obj_id == obj_id &&
963 !tags->is_deleted) ? 1 : 0;
964
965}
966
967static int yaffs_find_chunk_in_group(struct yaffs_dev *dev, int the_chunk,
968 struct yaffs_ext_tags *tags, int obj_id,
969 int inode_chunk)
970{
971 int j;
972
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)) {
977
978 if (dev->chunk_grp_size == 1)
979 return the_chunk;
980 else {
981 yaffs_rd_chunk_tags_nand(dev, the_chunk, NULL,
982 tags);
983 if (yaffs_tags_match(tags,
984 obj_id, inode_chunk)) {
985
986 return the_chunk;
987 }
988 }
989 }
990 the_chunk++;
991 }
992 return -1;
993}
994
995static int yaffs_find_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
996 struct yaffs_ext_tags *tags)
997{
998
999 struct yaffs_tnode *tn;
1000 int the_chunk = -1;
1001 struct yaffs_ext_tags local_tags;
1002 int ret_val = -1;
1003 struct yaffs_dev *dev = in->my_dev;
1004
1005 if (!tags) {
1006
1007 tags = &local_tags;
1008 }
1009
1010 tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk);
1011
1012 if (!tn)
1013 return ret_val;
1014
1015 the_chunk = yaffs_get_group_base(dev, tn, inode_chunk);
1016
1017 ret_val = yaffs_find_chunk_in_group(dev, the_chunk, tags, in->obj_id,
1018 inode_chunk);
1019 return ret_val;
1020}
1021
1022static int yaffs_find_del_file_chunk(struct yaffs_obj *in, int inode_chunk,
1023 struct yaffs_ext_tags *tags)
1024{
1025
1026 struct yaffs_tnode *tn;
1027 int the_chunk = -1;
1028 struct yaffs_ext_tags local_tags;
1029 struct yaffs_dev *dev = in->my_dev;
1030 int ret_val = -1;
1031
1032 if (!tags) {
1033
1034 tags = &local_tags;
1035 }
1036
1037 tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk);
1038
1039 if (!tn)
1040 return ret_val;
1041
1042 the_chunk = yaffs_get_group_base(dev, tn, inode_chunk);
1043
1044 ret_val = yaffs_find_chunk_in_group(dev, the_chunk, tags, in->obj_id,
1045 inode_chunk);
1046
1047
1048 if (ret_val != -1)
1049 yaffs_load_tnode_0(dev, tn, inode_chunk, 0);
1050
1051 return ret_val;
1052}
1053
1054int yaffs_put_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
1055 int nand_chunk, int in_scan)
1056{
1057
1058
1059
1060
1061
1062
1063
1064 struct yaffs_tnode *tn;
1065 struct yaffs_dev *dev = in->my_dev;
1066 int existing_cunk;
1067 struct yaffs_ext_tags existing_tags;
1068 struct yaffs_ext_tags new_tags;
1069 unsigned existing_serial, new_serial;
1070
1071 if (in->variant_type != YAFFS_OBJECT_TYPE_FILE) {
1072
1073
1074
1075
1076 if (!in_scan) {
1077 yaffs_trace(YAFFS_TRACE_ERROR,
1078 "yaffs tragedy:attempt to put data chunk into a non-file"
1079 );
1080 BUG();
1081 }
1082
1083 yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
1084 return YAFFS_OK;
1085 }
1086
1087 tn = yaffs_add_find_tnode_0(dev,
1088 &in->variant.file_variant,
1089 inode_chunk, NULL);
1090 if (!tn)
1091 return YAFFS_FAIL;
1092
1093 if (!nand_chunk)
1094
1095 return YAFFS_OK;
1096
1097 existing_cunk = yaffs_get_group_base(dev, tn, inode_chunk);
1098
1099 if (in_scan != 0) {
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111 if (existing_cunk > 0) {
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126 if (in_scan > 0) {
1127
1128 yaffs_rd_chunk_tags_nand(dev,
1129 nand_chunk,
1130 NULL, &new_tags);
1131
1132
1133 existing_cunk =
1134 yaffs_find_chunk_in_file(in, inode_chunk,
1135 &existing_tags);
1136 }
1137
1138 if (existing_cunk <= 0) {
1139
1140
1141 yaffs_trace(YAFFS_TRACE_ERROR,
1142 "yaffs tragedy: existing chunk < 0 in scan"
1143 );
1144
1145 }
1146
1147
1148
1149
1150
1151 if (in_scan > 0) {
1152 new_serial = new_tags.serial_number;
1153 existing_serial = existing_tags.serial_number;
1154 }
1155
1156 if ((in_scan > 0) &&
1157 (existing_cunk <= 0 ||
1158 ((existing_serial + 1) & 3) == new_serial)) {
1159
1160
1161
1162
1163
1164 yaffs_chunk_del(dev, existing_cunk, 1,
1165 __LINE__);
1166 } else {
1167
1168
1169
1170
1171
1172 yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
1173 return YAFFS_OK;
1174 }
1175 }
1176
1177 }
1178
1179 if (existing_cunk == 0)
1180 in->n_data_chunks++;
1181
1182 yaffs_load_tnode_0(dev, tn, inode_chunk, nand_chunk);
1183
1184 return YAFFS_OK;
1185}
1186
1187static void yaffs_soft_del_chunk(struct yaffs_dev *dev, int chunk)
1188{
1189 struct yaffs_block_info *the_block;
1190 unsigned block_no;
1191
1192 yaffs_trace(YAFFS_TRACE_DELETION, "soft delete chunk %d", chunk);
1193
1194 block_no = chunk / dev->param.chunks_per_block;
1195 the_block = yaffs_get_block_info(dev, block_no);
1196 if (the_block) {
1197 the_block->soft_del_pages++;
1198 dev->n_free_chunks++;
1199 yaffs2_update_oldest_dirty_seq(dev, block_no, the_block);
1200 }
1201}
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211static int yaffs_soft_del_worker(struct yaffs_obj *in, struct yaffs_tnode *tn,
1212 u32 level, int chunk_offset)
1213{
1214 int i;
1215 int the_chunk;
1216 int all_done = 1;
1217 struct yaffs_dev *dev = in->my_dev;
1218
1219 if (!tn)
1220 return 1;
1221
1222 if (level > 0) {
1223 for (i = YAFFS_NTNODES_INTERNAL - 1;
1224 all_done && i >= 0;
1225 i--) {
1226 if (tn->internal[i]) {
1227 all_done =
1228 yaffs_soft_del_worker(in,
1229 tn->internal[i],
1230 level - 1,
1231 (chunk_offset <<
1232 YAFFS_TNODES_INTERNAL_BITS)
1233 + i);
1234 if (all_done) {
1235 yaffs_free_tnode(dev,
1236 tn->internal[i]);
1237 tn->internal[i] = NULL;
1238 } else {
1239
1240 }
1241 }
1242 }
1243 return (all_done) ? 1 : 0;
1244 }
1245
1246
1247 for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
1248 the_chunk = yaffs_get_group_base(dev, tn, i);
1249 if (the_chunk) {
1250 yaffs_soft_del_chunk(dev, the_chunk);
1251 yaffs_load_tnode_0(dev, tn, i, 0);
1252 }
1253 }
1254 return 1;
1255}
1256
1257static void yaffs_remove_obj_from_dir(struct yaffs_obj *obj)
1258{
1259 struct yaffs_dev *dev = obj->my_dev;
1260 struct yaffs_obj *parent;
1261
1262 yaffs_verify_obj_in_dir(obj);
1263 parent = obj->parent;
1264
1265 yaffs_verify_dir(parent);
1266
1267 if (dev && dev->param.remove_obj_fn)
1268 dev->param.remove_obj_fn(obj);
1269
1270 list_del_init(&obj->siblings);
1271 obj->parent = NULL;
1272
1273 yaffs_verify_dir(parent);
1274}
1275
1276void yaffs_add_obj_to_dir(struct yaffs_obj *directory, struct yaffs_obj *obj)
1277{
1278 if (!directory) {
1279 yaffs_trace(YAFFS_TRACE_ALWAYS,
1280 "tragedy: Trying to add an object to a null pointer directory"
1281 );
1282 BUG();
1283 return;
1284 }
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"
1288 );
1289 BUG();
1290 }
1291
1292 if (obj->siblings.prev == NULL) {
1293
1294 BUG();
1295 }
1296
1297 yaffs_verify_dir(directory);
1298
1299 yaffs_remove_obj_from_dir(obj);
1300
1301
1302 list_add(&obj->siblings, &directory->variant.dir_variant.children);
1303 obj->parent = directory;
1304
1305 if (directory == obj->my_dev->unlinked_dir
1306 || directory == obj->my_dev->del_dir) {
1307 obj->unlinked = 1;
1308 obj->my_dev->n_unlinked_files++;
1309 obj->rename_allowed = 0;
1310 }
1311
1312 yaffs_verify_dir(directory);
1313 yaffs_verify_obj_in_dir(obj);
1314}
1315
1316static int yaffs_change_obj_name(struct yaffs_obj *obj,
1317 struct yaffs_obj *new_dir,
1318 const YCHAR *new_name, int force, int shadows)
1319{
1320 int unlink_op;
1321 int del_op;
1322 struct yaffs_obj *existing_target;
1323
1324 if (new_dir == NULL)
1325 new_dir = obj->parent;
1326
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"
1330 );
1331 BUG();
1332 }
1333
1334 unlink_op = (new_dir == obj->my_dev->unlinked_dir);
1335 del_op = (new_dir == obj->my_dev->del_dir);
1336
1337 existing_target = yaffs_find_by_name(new_dir, new_name);
1338
1339
1340
1341
1342
1343
1344 if (!(unlink_op || del_op || force ||
1345 shadows > 0 || !existing_target) ||
1346 new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
1347 return YAFFS_FAIL;
1348
1349 yaffs_set_obj_name(obj, new_name);
1350 obj->dirty = 1;
1351 yaffs_add_obj_to_dir(new_dir, obj);
1352
1353 if (unlink_op)
1354 obj->unlinked = 1;
1355
1356
1357 if (yaffs_update_oh(obj, new_name, 0, del_op, shadows, NULL) >= 0)
1358 return YAFFS_OK;
1359
1360 return YAFFS_FAIL;
1361}
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376static int yaffs_obj_cache_dirty(struct yaffs_obj *obj)
1377{
1378 struct yaffs_dev *dev = obj->my_dev;
1379 int i;
1380 struct yaffs_cache *cache;
1381 int n_caches = obj->my_dev->param.n_caches;
1382
1383 for (i = 0; i < n_caches; i++) {
1384 cache = &dev->cache[i];
1385 if (cache->object == obj && cache->dirty)
1386 return 1;
1387 }
1388
1389 return 0;
1390}
1391
1392static void yaffs_flush_file_cache(struct yaffs_obj *obj)
1393{
1394 struct yaffs_dev *dev = obj->my_dev;
1395 int lowest = -99;
1396 int i;
1397 struct yaffs_cache *cache;
1398 int chunk_written = 0;
1399 int n_caches = obj->my_dev->param.n_caches;
1400
1401 if (n_caches < 1)
1402 return;
1403 do {
1404 cache = NULL;
1405
1406
1407 for (i = 0; i < n_caches; i++) {
1408 if (dev->cache[i].object == obj &&
1409 dev->cache[i].dirty) {
1410 if (!cache ||
1411 dev->cache[i].chunk_id < lowest) {
1412 cache = &dev->cache[i];
1413 lowest = cache->chunk_id;
1414 }
1415 }
1416 }
1417
1418 if (cache && !cache->locked) {
1419
1420 chunk_written =
1421 yaffs_wr_data_obj(cache->object,
1422 cache->chunk_id,
1423 cache->data,
1424 cache->n_bytes, 1);
1425 cache->dirty = 0;
1426 cache->object = NULL;
1427 }
1428 } while (cache && chunk_written > 0);
1429
1430 if (cache)
1431
1432 yaffs_trace(YAFFS_TRACE_ERROR,
1433 "yaffs tragedy: no space during cache write");
1434}
1435
1436
1437
1438
1439
1440
1441void yaffs_flush_whole_cache(struct yaffs_dev *dev)
1442{
1443 struct yaffs_obj *obj;
1444 int n_caches = dev->param.n_caches;
1445 int i;
1446
1447
1448
1449
1450 do {
1451 obj = NULL;
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;
1455 }
1456 if (obj)
1457 yaffs_flush_file_cache(obj);
1458 } while (obj);
1459
1460}
1461
1462
1463
1464
1465
1466
1467static struct yaffs_cache *yaffs_grab_chunk_worker(struct yaffs_dev *dev)
1468{
1469 int i;
1470
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];
1475 }
1476 }
1477 return NULL;
1478}
1479
1480static struct yaffs_cache *yaffs_grab_chunk_cache(struct yaffs_dev *dev)
1481{
1482 struct yaffs_cache *cache;
1483 struct yaffs_obj *the_obj;
1484 int usage;
1485 int i;
1486
1487 if (dev->param.n_caches < 1)
1488 return NULL;
1489
1490
1491
1492 cache = yaffs_grab_chunk_worker(dev);
1493
1494 if (!cache) {
1495
1496
1497
1498
1499
1500
1501
1502
1503 the_obj = dev->cache[0].object;
1504 usage = -1;
1505 cache = NULL;
1506
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 ||
1511 !cache)) {
1512 usage = dev->cache[i].last_use;
1513 the_obj = dev->cache[i].object;
1514 cache = &dev->cache[i];
1515 }
1516 }
1517
1518 if (!cache || cache->dirty) {
1519
1520 yaffs_flush_file_cache(the_obj);
1521 cache = yaffs_grab_chunk_worker(dev);
1522 }
1523 }
1524 return cache;
1525}
1526
1527
1528static struct yaffs_cache *yaffs_find_chunk_cache(const struct yaffs_obj *obj,
1529 int chunk_id)
1530{
1531 struct yaffs_dev *dev = obj->my_dev;
1532 int i;
1533
1534 if (dev->param.n_caches < 1)
1535 return NULL;
1536
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) {
1540 dev->cache_hits++;
1541
1542 return &dev->cache[i];
1543 }
1544 }
1545 return NULL;
1546}
1547
1548
1549static void yaffs_use_cache(struct yaffs_dev *dev, struct yaffs_cache *cache,
1550 int is_write)
1551{
1552 int i;
1553
1554 if (dev->param.n_caches < 1)
1555 return;
1556
1557 if (dev->cache_last_use < 0 ||
1558 dev->cache_last_use > 100000000) {
1559
1560 for (i = 1; i < dev->param.n_caches; i++)
1561 dev->cache[i].last_use = 0;
1562
1563 dev->cache_last_use = 0;
1564 }
1565 dev->cache_last_use++;
1566 cache->last_use = dev->cache_last_use;
1567
1568 if (is_write)
1569 cache->dirty = 1;
1570}
1571
1572
1573
1574
1575
1576static void yaffs_invalidate_chunk_cache(struct yaffs_obj *object, int chunk_id)
1577{
1578 struct yaffs_cache *cache;
1579
1580 if (object->my_dev->param.n_caches > 0) {
1581 cache = yaffs_find_chunk_cache(object, chunk_id);
1582
1583 if (cache)
1584 cache->object = NULL;
1585 }
1586}
1587
1588
1589
1590
1591static void yaffs_invalidate_whole_cache(struct yaffs_obj *in)
1592{
1593 int i;
1594 struct yaffs_dev *dev = in->my_dev;
1595
1596 if (dev->param.n_caches > 0) {
1597
1598 for (i = 0; i < dev->param.n_caches; i++) {
1599 if (dev->cache[i].object == in)
1600 dev->cache[i].object = NULL;
1601 }
1602 }
1603}
1604
1605static void yaffs_unhash_obj(struct yaffs_obj *obj)
1606{
1607 int bucket;
1608 struct yaffs_dev *dev = obj->my_dev;
1609
1610
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--;
1615 }
1616}
1617
1618
1619static void yaffs_free_obj(struct yaffs_obj *obj)
1620{
1621 struct yaffs_dev *dev;
1622
1623 if (!obj) {
1624 BUG();
1625 return;
1626 }
1627 dev = obj->my_dev;
1628 yaffs_trace(YAFFS_TRACE_OS, "FreeObject %p inode %p",
1629 obj, obj->my_inode);
1630 if (obj->parent)
1631 BUG();
1632 if (!list_empty(&obj->siblings))
1633 BUG();
1634
1635 if (obj->my_inode) {
1636
1637
1638
1639 obj->defered_free = 1;
1640 return;
1641 }
1642
1643 yaffs_unhash_obj(obj);
1644
1645 yaffs_free_raw_obj(dev, obj);
1646 dev->n_obj--;
1647 dev->checkpoint_blocks_required = 0;
1648}
1649
1650void yaffs_handle_defered_free(struct yaffs_obj *obj)
1651{
1652 if (obj->defered_free)
1653 yaffs_free_obj(obj);
1654}
1655
1656static int yaffs_generic_obj_del(struct yaffs_obj *in)
1657{
1658
1659 yaffs_invalidate_whole_cache(in);
1660
1661 if (in->my_dev->param.is_yaffs2 && in->parent != in->my_dev->del_dir) {
1662
1663 yaffs_change_obj_name(in, in->my_dev->del_dir, _Y("deleted"), 0,
1664 0);
1665 }
1666
1667 yaffs_remove_obj_from_dir(in);
1668 yaffs_chunk_del(in->my_dev, in->hdr_chunk, 1, __LINE__);
1669 in->hdr_chunk = 0;
1670
1671 yaffs_free_obj(in);
1672 return YAFFS_OK;
1673
1674}
1675
1676static void yaffs_soft_del_file(struct yaffs_obj *obj)
1677{
1678 if (!obj->deleted ||
1679 obj->variant_type != YAFFS_OBJECT_TYPE_FILE ||
1680 obj->soft_del)
1681 return;
1682
1683 if (obj->n_data_chunks <= 0) {
1684
1685
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",
1690 obj->obj_id);
1691 yaffs_generic_obj_del(obj);
1692 } else {
1693 yaffs_soft_del_worker(obj,
1694 obj->variant.file_variant.top,
1695 obj->variant.
1696 file_variant.top_level, 0);
1697 obj->soft_del = 1;
1698 }
1699}
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716static struct yaffs_tnode *yaffs_prune_worker(struct yaffs_dev *dev,
1717 struct yaffs_tnode *tn, u32 level,
1718 int del0)
1719{
1720 int i;
1721 int has_data;
1722
1723 if (!tn)
1724 return tn;
1725
1726 has_data = 0;
1727
1728 if (level > 0) {
1729 for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
1730 if (tn->internal[i]) {
1731 tn->internal[i] =
1732 yaffs_prune_worker(dev,
1733 tn->internal[i],
1734 level - 1,
1735 (i == 0) ? del0 : 1);
1736 }
1737
1738 if (tn->internal[i])
1739 has_data++;
1740 }
1741 } else {
1742 int tnode_size_u32 = dev->tnode_size / sizeof(u32);
1743 u32 *map = (u32 *) tn;
1744
1745 for (i = 0; !has_data && i < tnode_size_u32; i++) {
1746 if (map[i])
1747 has_data++;
1748 }
1749 }
1750
1751 if (has_data == 0 && del0) {
1752
1753 yaffs_free_tnode(dev, tn);
1754 tn = NULL;
1755 }
1756 return tn;
1757}
1758
1759static int yaffs_prune_tree(struct yaffs_dev *dev,
1760 struct yaffs_file_var *file_struct)
1761{
1762 int i;
1763 int has_data;
1764 int done = 0;
1765 struct yaffs_tnode *tn;
1766
1767 if (file_struct->top_level < 1)
1768 return YAFFS_OK;
1769
1770 file_struct->top =
1771 yaffs_prune_worker(dev, file_struct->top, file_struct->top_level, 0);
1772
1773
1774
1775
1776
1777
1778
1779
1780 while (file_struct->top_level && !done) {
1781 tn = file_struct->top;
1782
1783 has_data = 0;
1784 for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
1785 if (tn->internal[i])
1786 has_data++;
1787 }
1788
1789 if (!has_data) {
1790 file_struct->top = tn->internal[0];
1791 file_struct->top_level--;
1792 yaffs_free_tnode(dev, tn);
1793 } else {
1794 done = 1;
1795 }
1796 }
1797
1798 return YAFFS_OK;
1799}
1800
1801
1802
1803
1804static struct yaffs_obj *yaffs_alloc_empty_obj(struct yaffs_dev *dev)
1805{
1806 struct yaffs_obj *obj = yaffs_alloc_raw_obj(dev);
1807
1808 if (!obj)
1809 return obj;
1810
1811 dev->n_obj++;
1812
1813
1814
1815 memset(obj, 0, sizeof(struct yaffs_obj));
1816 obj->being_created = 1;
1817
1818 obj->my_dev = dev;
1819 obj->hdr_chunk = 0;
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);
1824
1825
1826 if (dev->root_dir) {
1827 obj->parent = dev->root_dir;
1828 list_add(&(obj->siblings),
1829 &dev->root_dir->variant.dir_variant.children);
1830 }
1831
1832
1833
1834
1835
1836 if (dev->lost_n_found)
1837 yaffs_add_obj_to_dir(dev->lost_n_found, obj);
1838
1839 obj->being_created = 0;
1840
1841 dev->checkpoint_blocks_required = 0;
1842
1843 return obj;
1844}
1845
1846static int yaffs_find_nice_bucket(struct yaffs_dev *dev)
1847{
1848 int i;
1849 int l = 999;
1850 int lowest = 999999;
1851
1852
1853
1854
1855
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;
1862 }
1863 }
1864
1865 return l;
1866}
1867
1868static int yaffs_new_obj_id(struct yaffs_dev *dev)
1869{
1870 int bucket = yaffs_find_nice_bucket(dev);
1871 int found = 0;
1872 struct list_head *i;
1873 u32 n = (u32) bucket;
1874
1875
1876
1877
1878
1879 while (!found) {
1880 found = 1;
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
1885 if (i && list_entry(i, struct yaffs_obj,
1886 hash_link)->obj_id == n) {
1887 found = 0;
1888 }
1889 }
1890 }
1891 }
1892 return n;
1893}
1894
1895static void yaffs_hash_obj(struct yaffs_obj *in)
1896{
1897 int bucket = yaffs_hash_fn(in->obj_id);
1898 struct yaffs_dev *dev = in->my_dev;
1899
1900 list_add(&in->hash_link, &dev->obj_bucket[bucket].list);
1901 dev->obj_bucket[bucket].count++;
1902}
1903
1904struct yaffs_obj *yaffs_find_by_number(struct yaffs_dev *dev, u32 number)
1905{
1906 int bucket = yaffs_hash_fn(number);
1907 struct list_head *i;
1908 struct yaffs_obj *in;
1909
1910 list_for_each(i, &dev->obj_bucket[bucket].list) {
1911
1912 in = list_entry(i, struct yaffs_obj, hash_link);
1913 if (in->obj_id == number) {
1914
1915 if (in->defered_free)
1916 return NULL;
1917 return in;
1918 }
1919 }
1920
1921 return NULL;
1922}
1923
1924struct yaffs_obj *yaffs_new_obj(struct yaffs_dev *dev, int number,
1925 enum yaffs_obj_type type)
1926{
1927 struct yaffs_obj *the_obj = NULL;
1928 struct yaffs_tnode *tn = NULL;
1929
1930 if (number < 0)
1931 number = yaffs_new_obj_id(dev);
1932
1933 if (type == YAFFS_OBJECT_TYPE_FILE) {
1934 tn = yaffs_get_tnode(dev);
1935 if (!tn)
1936 return NULL;
1937 }
1938
1939 the_obj = yaffs_alloc_empty_obj(dev);
1940 if (!the_obj) {
1941 if (tn)
1942 yaffs_free_tnode(dev, tn);
1943 return NULL;
1944 }
1945
1946 the_obj->fake = 0;
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);
1953
1954 switch (type) {
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;
1962 break;
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);
1966 break;
1967 case YAFFS_OBJECT_TYPE_SYMLINK:
1968 case YAFFS_OBJECT_TYPE_HARDLINK:
1969 case YAFFS_OBJECT_TYPE_SPECIAL:
1970
1971 break;
1972 case YAFFS_OBJECT_TYPE_UNKNOWN:
1973
1974 break;
1975 }
1976 return the_obj;
1977}
1978
1979static struct yaffs_obj *yaffs_create_fake_dir(struct yaffs_dev *dev,
1980 int number, u32 mode)
1981{
1982
1983 struct yaffs_obj *obj =
1984 yaffs_new_obj(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
1985
1986 if (!obj)
1987 return NULL;
1988
1989 obj->fake = 1;
1990 obj->rename_allowed = 0;
1991 obj->unlink_allowed = 0;
1992 obj->deleted = 0;
1993 obj->unlinked = 0;
1994 obj->yst_mode = mode;
1995 obj->my_dev = dev;
1996 obj->hdr_chunk = 0;
1997 return obj;
1998
1999}
2000
2001
2002static void yaffs_init_tnodes_and_objs(struct yaffs_dev *dev)
2003{
2004 int i;
2005
2006 dev->n_obj = 0;
2007 dev->n_tnodes = 0;
2008 yaffs_init_raw_tnodes_and_objs(dev);
2009
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;
2013 }
2014}
2015
2016struct yaffs_obj *yaffs_find_or_create_by_number(struct yaffs_dev *dev,
2017 int number,
2018 enum yaffs_obj_type type)
2019{
2020 struct yaffs_obj *the_obj = NULL;
2021
2022 if (number > 0)
2023 the_obj = yaffs_find_by_number(dev, number);
2024
2025 if (!the_obj)
2026 the_obj = yaffs_new_obj(dev, number, type);
2027
2028 return the_obj;
2029
2030}
2031
2032YCHAR *yaffs_clone_str(const YCHAR *str)
2033{
2034 YCHAR *new_str = NULL;
2035 int len;
2036
2037 if (!str)
2038 str = _Y("");
2039
2040 len = yaffs_strnlen(str, YAFFS_MAX_ALIAS_LENGTH);
2041 new_str = kmalloc((len + 1) * sizeof(YCHAR), GFP_NOFS);
2042 if (new_str) {
2043 yaffs_strncpy(new_str, str, len);
2044 new_str[len] = 0;
2045 }
2046 return new_str;
2047
2048}
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065static void yaffs_update_parent(struct yaffs_obj *obj)
2066{
2067 struct yaffs_dev *dev;
2068
2069 if (!obj)
2070 return;
2071 dev = obj->my_dev;
2072 obj->dirty = 1;
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;
2076
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",
2081 obj->obj_id);
2082 }
2083
2084 } else {
2085 yaffs_update_oh(obj, NULL, 0, 0, 0, NULL);
2086 }
2087}
2088
2089void yaffs_update_dirty_dirs(struct yaffs_dev *dev)
2090{
2091 struct list_head *link;
2092 struct yaffs_obj *obj;
2093 struct yaffs_dir_var *d_s;
2094 union yaffs_obj_var *o_v;
2095
2096 yaffs_trace(YAFFS_TRACE_BACKGROUND, "Update dirty directories");
2097
2098 while (!list_empty(&dev->dirty_dirs)) {
2099 link = dev->dirty_dirs.next;
2100 list_del_init(link);
2101
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);
2105
2106 yaffs_trace(YAFFS_TRACE_BACKGROUND, "Update directory %d",
2107 obj->obj_id);
2108
2109 if (obj->dirty)
2110 yaffs_update_oh(obj, NULL, 0, 0, 0, NULL);
2111 }
2112}
2113
2114
2115
2116
2117
2118
2119
2120
2121static struct yaffs_obj *yaffs_create_obj(enum yaffs_obj_type type,
2122 struct yaffs_obj *parent,
2123 const YCHAR *name,
2124 u32 mode,
2125 u32 uid,
2126 u32 gid,
2127 struct yaffs_obj *equiv_obj,
2128 const YCHAR *alias_str, u32 rdev)
2129{
2130 struct yaffs_obj *in;
2131 YCHAR *str = NULL;
2132 struct yaffs_dev *dev = parent->my_dev;
2133
2134
2135
2136 if (yaffs_find_by_name(parent, name))
2137 return NULL;
2138
2139 if (type == YAFFS_OBJECT_TYPE_SYMLINK) {
2140 str = yaffs_clone_str(alias_str);
2141 if (!str)
2142 return NULL;
2143 }
2144
2145 in = yaffs_new_obj(dev, -1, type);
2146
2147 if (!in) {
2148 kfree(str);
2149 return NULL;
2150 }
2151
2152 in->hdr_chunk = 0;
2153 in->valid = 1;
2154 in->variant_type = type;
2155
2156 in->yst_mode = mode;
2157
2158 yaffs_attribs_init(in, gid, uid, rdev);
2159
2160 in->n_data_chunks = 0;
2161
2162 yaffs_set_obj_name(in, name);
2163 in->dirty = 1;
2164
2165 yaffs_add_obj_to_dir(parent, in);
2166
2167 in->my_dev = parent->my_dev;
2168
2169 switch (type) {
2170 case YAFFS_OBJECT_TYPE_SYMLINK:
2171 in->variant.symlink_variant.alias = str;
2172 break;
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);
2177 break;
2178 case YAFFS_OBJECT_TYPE_FILE:
2179 case YAFFS_OBJECT_TYPE_DIRECTORY:
2180 case YAFFS_OBJECT_TYPE_SPECIAL:
2181 case YAFFS_OBJECT_TYPE_UNKNOWN:
2182
2183 break;
2184 }
2185
2186 if (yaffs_update_oh(in, name, 0, 0, 0, NULL) < 0) {
2187
2188 yaffs_del_obj(in);
2189 in = NULL;
2190 }
2191
2192 if (in)
2193 yaffs_update_parent(parent);
2194
2195 return in;
2196}
2197
2198struct yaffs_obj *yaffs_create_file(struct yaffs_obj *parent,
2199 const YCHAR *name, u32 mode, u32 uid,
2200 u32 gid)
2201{
2202 return yaffs_create_obj(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
2203 uid, gid, NULL, NULL, 0);
2204}
2205
2206struct yaffs_obj *yaffs_create_dir(struct yaffs_obj *parent, const YCHAR *name,
2207 u32 mode, u32 uid, u32 gid)
2208{
2209 return yaffs_create_obj(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
2210 mode, uid, gid, NULL, NULL, 0);
2211}
2212
2213struct yaffs_obj *yaffs_create_special(struct yaffs_obj *parent,
2214 const YCHAR *name, u32 mode, u32 uid,
2215 u32 gid, u32 rdev)
2216{
2217 return yaffs_create_obj(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
2218 uid, gid, NULL, NULL, rdev);
2219}
2220
2221struct yaffs_obj *yaffs_create_symlink(struct yaffs_obj *parent,
2222 const YCHAR *name, u32 mode, u32 uid,
2223 u32 gid, const YCHAR *alias)
2224{
2225 return yaffs_create_obj(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
2226 uid, gid, NULL, alias, 0);
2227}
2228
2229
2230struct yaffs_obj *yaffs_link_obj(struct yaffs_obj *parent, const YCHAR * name,
2231 struct yaffs_obj *equiv_obj)
2232{
2233
2234 equiv_obj = yaffs_get_equivalent_obj(equiv_obj);
2235
2236 if (yaffs_create_obj(YAFFS_OBJECT_TYPE_HARDLINK,
2237 parent, name, 0, 0, 0,
2238 equiv_obj, NULL, 0))
2239 return equiv_obj;
2240
2241 return NULL;
2242
2243}
2244
2245
2246
2247
2248
2249static void yaffs_deinit_blocks(struct yaffs_dev *dev)
2250{
2251 if (dev->block_info_alt && dev->block_info)
2252 vfree(dev->block_info);
2253 else
2254 kfree(dev->block_info);
2255
2256 dev->block_info_alt = 0;
2257
2258 dev->block_info = NULL;
2259
2260 if (dev->chunk_bits_alt && dev->chunk_bits)
2261 vfree(dev->chunk_bits);
2262 else
2263 kfree(dev->chunk_bits);
2264 dev->chunk_bits_alt = 0;
2265 dev->chunk_bits = NULL;
2266}
2267
2268static int yaffs_init_blocks(struct yaffs_dev *dev)
2269{
2270 int n_blocks = dev->internal_end_block - dev->internal_start_block + 1;
2271
2272 dev->block_info = NULL;
2273 dev->chunk_bits = NULL;
2274 dev->alloc_block = -1;
2275
2276
2277 dev->block_info =
2278 kmalloc(n_blocks * sizeof(struct yaffs_block_info), GFP_NOFS);
2279 if (!dev->block_info) {
2280 dev->block_info =
2281 vmalloc(n_blocks * sizeof(struct yaffs_block_info));
2282 dev->block_info_alt = 1;
2283 } else {
2284 dev->block_info_alt = 0;
2285 }
2286
2287 if (!dev->block_info)
2288 goto alloc_error;
2289
2290
2291 dev->chunk_bit_stride = (dev->param.chunks_per_block + 7) / 8;
2292 dev->chunk_bits =
2293 kmalloc(dev->chunk_bit_stride * n_blocks, GFP_NOFS);
2294 if (!dev->chunk_bits) {
2295 dev->chunk_bits =
2296 vmalloc(dev->chunk_bit_stride * n_blocks);
2297 dev->chunk_bits_alt = 1;
2298 } else {
2299 dev->chunk_bits_alt = 0;
2300 }
2301 if (!dev->chunk_bits)
2302 goto alloc_error;
2303
2304
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);
2307 return YAFFS_OK;
2308
2309alloc_error:
2310 yaffs_deinit_blocks(dev);
2311 return YAFFS_FAIL;
2312}
2313
2314
2315void yaffs_block_became_dirty(struct yaffs_dev *dev, int block_no)
2316{
2317 struct yaffs_block_info *bi = yaffs_get_block_info(dev, block_no);
2318 int erased_ok = 0;
2319 int i;
2320
2321
2322
2323
2324
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" : "");
2329
2330 yaffs2_clear_oldest_dirty_seq(dev, bi);
2331
2332 bi->block_state = YAFFS_BLOCK_STATE_DIRTY;
2333
2334
2335 if (block_no == dev->gc_block)
2336 dev->gc_block = 0;
2337
2338
2339
2340 if (block_no == dev->gc_dirtiest) {
2341 dev->gc_dirtiest = 0;
2342 dev->gc_pages_in_use = 0;
2343 }
2344
2345 if (!bi->needs_retiring) {
2346 yaffs2_checkpt_invalidate(dev);
2347 erased_ok = yaffs_erase_block(dev, block_no);
2348 if (!erased_ok) {
2349 dev->n_erase_failures++;
2350 yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2351 "**>> Erasure failed %d", block_no);
2352 }
2353 }
2354
2355
2356 if (erased_ok &&
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",
2364 block_no, i);
2365 }
2366 }
2367 }
2368
2369 if (!erased_ok) {
2370
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);
2375 return;
2376 }
2377
2378
2379 bi->block_state = YAFFS_BLOCK_STATE_EMPTY;
2380 bi->seq_number = 0;
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;
2386 bi->gc_prioritise = 0;
2387 bi->has_summary = 0;
2388
2389 yaffs_clear_chunk_bits(dev, block_no);
2390
2391 yaffs_trace(YAFFS_TRACE_ERASE, "Erased block %d", block_no);
2392}
2393
2394static inline int yaffs_gc_process_chunk(struct yaffs_dev *dev,
2395 struct yaffs_block_info *bi,
2396 int old_chunk, u8 *buffer)
2397{
2398 int new_chunk;
2399 int mark_flash = 1;
2400 struct yaffs_ext_tags tags;
2401 struct yaffs_obj *object;
2402 int matching_chunk;
2403 int ret_val = YAFFS_OK;
2404
2405 memset(&tags, 0, sizeof(tags));
2406 yaffs_rd_chunk_tags_nand(dev, old_chunk,
2407 buffer, &tags);
2408 object = yaffs_find_by_number(dev, tags.obj_id);
2409
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);
2414
2415 if (object && !yaffs_skip_verification(dev)) {
2416 if (tags.chunk_id == 0)
2417 matching_chunk =
2418 object->hdr_chunk;
2419 else if (object->soft_del)
2420
2421 matching_chunk = old_chunk;
2422 else
2423 matching_chunk =
2424 yaffs_find_chunk_in_file
2425 (object, tags.chunk_id,
2426 NULL);
2427
2428 if (old_chunk != matching_chunk)
2429 yaffs_trace(YAFFS_TRACE_ERROR,
2430 "gc: page in gc mismatch: %d %d %d %d",
2431 old_chunk,
2432 matching_chunk,
2433 tags.obj_id,
2434 tags.chunk_id);
2435 }
2436
2437 if (!object) {
2438 yaffs_trace(YAFFS_TRACE_ERROR,
2439 "page %d in gc has no object: %d %d %d ",
2440 old_chunk,
2441 tags.obj_id, tags.chunk_id,
2442 tags.n_bytes);
2443 }
2444
2445 if (object &&
2446 object->deleted &&
2447 object->soft_del && tags.chunk_id != 0) {
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462 dev->n_free_chunks--;
2463 bi->soft_del_pages--;
2464
2465 object->n_data_chunks--;
2466 if (object->n_data_chunks <= 0) {
2467
2468 dev->gc_cleanup_list[dev->n_clean_ups] = tags.obj_id;
2469 dev->n_clean_ups++;
2470 }
2471 mark_flash = 0;
2472 } else if (object) {
2473
2474
2475
2476
2477
2478
2479
2480 tags.serial_number++;
2481 dev->n_gc_copies++;
2482
2483 if (tags.chunk_id == 0) {
2484
2485
2486
2487
2488
2489
2490
2491 struct yaffs_obj_hdr *oh;
2492 oh = (struct yaffs_obj_hdr *) buffer;
2493
2494 oh->is_shrink = 0;
2495 tags.extra_is_shrink = 0;
2496 oh->shadows_obj = 0;
2497 oh->inband_shadowed_obj_id = 0;
2498 tags.extra_shadows = 0;
2499
2500
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;
2506 }
2507
2508 yaffs_verify_oh(object, oh, &tags, 1);
2509 new_chunk =
2510 yaffs_write_new_chunk(dev, (u8 *) oh, &tags, 1);
2511 } else {
2512 new_chunk =
2513 yaffs_write_new_chunk(dev, buffer, &tags, 1);
2514 }
2515
2516 if (new_chunk < 0) {
2517 ret_val = YAFFS_FAIL;
2518 } else {
2519
2520
2521
2522 if (tags.chunk_id == 0) {
2523
2524 object->hdr_chunk = new_chunk;
2525 object->serial = tags.serial_number;
2526 } else {
2527
2528 yaffs_put_chunk_in_file(object, tags.chunk_id,
2529 new_chunk, 0);
2530 }
2531 }
2532 }
2533 if (ret_val == YAFFS_OK)
2534 yaffs_chunk_del(dev, old_chunk, mark_flash, __LINE__);
2535 return ret_val;
2536}
2537
2538static int yaffs_gc_block(struct yaffs_dev *dev, int block, int whole_block)
2539{
2540 int old_chunk;
2541 int ret_val = YAFFS_OK;
2542 int i;
2543 int is_checkpt_block;
2544 int max_copies;
2545 int chunks_before = yaffs_get_erased_chunks(dev);
2546 int chunks_after;
2547 struct yaffs_block_info *bi = yaffs_get_block_info(dev, block);
2548
2549 is_checkpt_block = (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT);
2550
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,
2554 whole_block);
2555
2556
2557
2558 if (bi->block_state == YAFFS_BLOCK_STATE_FULL)
2559 bi->block_state = YAFFS_BLOCK_STATE_COLLECTING;
2560
2561 bi->has_shrink_hdr = 0;
2562
2563 dev->gc_disable = 1;
2564
2565 yaffs_summary_gc(dev, block);
2566
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",
2570 block);
2571 yaffs_block_became_dirty(dev, block);
2572 } else {
2573
2574 u8 *buffer = yaffs_get_temp_buffer(dev);
2575
2576 yaffs_verify_blk(dev, bi, block);
2577
2578 max_copies = (whole_block) ? dev->param.chunks_per_block : 5;
2579 old_chunk = block * dev->param.chunks_per_block + dev->gc_chunk;
2580
2581 for ( ;
2582 ret_val == YAFFS_OK &&
2583 dev->gc_chunk < dev->param.chunks_per_block &&
2584 (bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) &&
2585 max_copies > 0;
2586 dev->gc_chunk++, old_chunk++) {
2587 if (yaffs_check_chunk_bit(dev, block, dev->gc_chunk)) {
2588
2589 max_copies--;
2590 ret_val = yaffs_gc_process_chunk(dev, bi,
2591 old_chunk, buffer);
2592 }
2593 }
2594 yaffs_release_temp_buffer(dev, buffer);
2595 }
2596
2597 yaffs_verify_collected_blk(dev, bi, block);
2598
2599 if (bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) {
2600
2601
2602
2603
2604 bi->block_state = YAFFS_BLOCK_STATE_FULL;
2605 } else {
2606
2607
2608 for (i = 0; i < dev->n_clean_ups; i++) {
2609
2610 struct yaffs_obj *object =
2611 yaffs_find_by_number(dev, dev->gc_cleanup_list[i]);
2612 if (object) {
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",
2618 object->obj_id);
2619 yaffs_generic_obj_del(object);
2620 object->my_dev->n_deleted_files--;
2621 }
2622
2623 }
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);
2629 dev->gc_block = 0;
2630 dev->gc_chunk = 0;
2631 dev->n_clean_ups = 0;
2632 }
2633
2634 dev->gc_disable = 0;
2635
2636 return ret_val;
2637}
2638
2639
2640
2641
2642
2643
2644static unsigned yaffs_find_gc_block(struct yaffs_dev *dev,
2645 int aggressive, int background)
2646{
2647 int i;
2648 int iterations;
2649 unsigned selected = 0;
2650 int prioritised = 0;
2651 int prioritised_exist = 0;
2652 struct yaffs_block_info *bi;
2653 int threshold;
2654
2655
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++) {
2661
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)) {
2666 selected = i;
2667 prioritised = 1;
2668 }
2669 }
2670 bi++;
2671 }
2672
2673
2674
2675
2676
2677
2678
2679 if (prioritised_exist &&
2680 !selected && dev->oldest_dirty_block > 0)
2681 selected = dev->oldest_dirty_block;
2682
2683 if (!prioritised_exist)
2684 dev->has_pending_prioritised_gc = 0;
2685 }
2686
2687
2688
2689
2690
2691
2692
2693 if (!selected) {
2694 int pages_used;
2695 int n_blocks =
2696 dev->internal_end_block - dev->internal_start_block + 1;
2697 if (aggressive) {
2698 threshold = dev->param.chunks_per_block;
2699 iterations = n_blocks;
2700 } else {
2701 int max_threshold;
2702
2703 if (background)
2704 max_threshold = dev->param.chunks_per_block / 2;
2705 else
2706 max_threshold = dev->param.chunks_per_block / 8;
2707
2708 if (max_threshold < YAFFS_GC_PASSIVE_THRESHOLD)
2709 max_threshold = YAFFS_GC_PASSIVE_THRESHOLD;
2710
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;
2716
2717 iterations = n_blocks / 16 + 1;
2718 if (iterations > 100)
2719 iterations = 100;
2720 }
2721
2722 for (i = 0;
2723 i < iterations &&
2724 (dev->gc_dirtiest < 1 ||
2725 dev->gc_pages_in_use > YAFFS_GC_GOOD_ENOUGH);
2726 i++) {
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;
2732
2733 bi = yaffs_get_block_info(dev, dev->gc_block_finder);
2734
2735 pages_used = bi->pages_in_use - bi->soft_del_pages;
2736
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;
2744 }
2745 }
2746
2747 if (dev->gc_dirtiest > 0 && dev->gc_pages_in_use <= threshold)
2748 selected = dev->gc_dirtiest;
2749 }
2750
2751
2752
2753
2754
2755
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;
2766 } else {
2767 dev->gc_not_done = 0;
2768 }
2769 }
2770
2771 if (selected) {
2772 yaffs_trace(YAFFS_TRACE_GC,
2773 "GC Selected block %d with %d free, prioritised:%d",
2774 selected,
2775 dev->param.chunks_per_block - dev->gc_pages_in_use,
2776 prioritised);
2777
2778 dev->n_gc_blocks++;
2779 if (background)
2780 dev->bg_gcs++;
2781
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--;
2787 } else {
2788 dev->gc_not_done++;
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" : "");
2794 }
2795
2796 return selected;
2797}
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808static int yaffs_check_gc(struct yaffs_dev *dev, int background)
2809{
2810 int aggressive = 0;
2811 int gc_ok = YAFFS_OK;
2812 int max_tries = 0;
2813 int min_erased;
2814 int erased_chunks;
2815 int checkpt_block_adjust;
2816
2817 if (dev->param.gc_control && (dev->param.gc_control(dev) & 1) == 0)
2818 return YAFFS_OK;
2819
2820 if (dev->gc_disable)
2821
2822 return YAFFS_OK;
2823
2824
2825
2826
2827
2828 do {
2829 max_tries++;
2830
2831 checkpt_block_adjust = yaffs_calc_checkpt_blocks_required(dev);
2832
2833 min_erased =
2834 dev->param.n_reserved_blocks + checkpt_block_adjust + 1;
2835 erased_chunks =
2836 dev->n_erased_blocks * dev->param.chunks_per_block;
2837
2838
2839 if (dev->n_erased_blocks < min_erased)
2840 aggressive = 1;
2841 else {
2842 if (!background
2843 && erased_chunks > (dev->n_free_chunks / 4))
2844 break;
2845
2846 if (dev->gc_skip > 20)
2847 dev->gc_skip = 20;
2848 if (erased_chunks < dev->n_free_chunks / 2 ||
2849 dev->gc_skip < 1 || background)
2850 aggressive = 0;
2851 else {
2852 dev->gc_skip--;
2853 break;
2854 }
2855 }
2856
2857 dev->gc_skip = 5;
2858
2859
2860
2861
2862 if (dev->gc_block < 1 && !aggressive) {
2863 dev->gc_block = yaffs2_find_refresh_block(dev);
2864 dev->gc_chunk = 0;
2865 dev->n_clean_ups = 0;
2866 }
2867 if (dev->gc_block < 1) {
2868 dev->gc_block =
2869 yaffs_find_gc_block(dev, aggressive, background);
2870 dev->gc_chunk = 0;
2871 dev->n_clean_ups = 0;
2872 }
2873
2874 if (dev->gc_block > 0) {
2875 dev->all_gcs++;
2876 if (!aggressive)
2877 dev->passive_gc_count++;
2878
2879 yaffs_trace(YAFFS_TRACE_GC,
2880 "yaffs: GC n_erased_blocks %d aggressive %d",
2881 dev->n_erased_blocks, aggressive);
2882
2883 gc_ok = yaffs_gc_block(dev, dev->gc_block, aggressive);
2884 }
2885
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,
2891 dev->gc_block);
2892 }
2893 } while ((dev->n_erased_blocks < dev->param.n_reserved_blocks) &&
2894 (dev->gc_block > 0) && (max_tries < 2));
2895
2896 return aggressive ? gc_ok : YAFFS_OK;
2897}
2898
2899
2900
2901
2902
2903
2904int yaffs_bg_gc(struct yaffs_dev *dev, unsigned urgency)
2905{
2906 int erased_chunks = dev->n_erased_blocks * dev->param.chunks_per_block;
2907
2908 yaffs_trace(YAFFS_TRACE_BACKGROUND, "Background gc %u", urgency);
2909
2910 yaffs_check_gc(dev, 1);
2911 return erased_chunks > dev->n_free_chunks / 2;
2912}
2913
2914
2915
2916static int yaffs_rd_data_obj(struct yaffs_obj *in, int inode_chunk, u8 * buffer)
2917{
2918 int nand_chunk = yaffs_find_chunk_in_file(in, inode_chunk, NULL);
2919
2920 if (nand_chunk >= 0)
2921 return yaffs_rd_chunk_tags_nand(in->my_dev, nand_chunk,
2922 buffer, NULL);
2923 else {
2924 yaffs_trace(YAFFS_TRACE_NANDACCESS,
2925 "Chunk %d not found zero instead",
2926 nand_chunk);
2927
2928 memset(buffer, 0, in->my_dev->data_bytes_per_chunk);
2929 return 0;
2930 }
2931
2932}
2933
2934void yaffs_chunk_del(struct yaffs_dev *dev, int chunk_id, int mark_flash,
2935 int lyn)
2936{
2937 int block;
2938 int page;
2939 struct yaffs_ext_tags tags;
2940 struct yaffs_block_info *bi;
2941
2942 if (chunk_id <= 0)
2943 return;
2944
2945 dev->n_deletions++;
2946 block = chunk_id / dev->param.chunks_per_block;
2947 page = chunk_id % dev->param.chunks_per_block;
2948
2949 if (!yaffs_check_chunk_bit(dev, block, page))
2950 yaffs_trace(YAFFS_TRACE_VERIFY,
2951 "Deleting invalid chunk %d", chunk_id);
2952
2953 bi = yaffs_get_block_info(dev, block);
2954
2955 yaffs2_update_oldest_dirty_seq(dev, block, bi);
2956
2957 yaffs_trace(YAFFS_TRACE_DELETION,
2958 "line %d delete of chunk %d",
2959 lyn, chunk_id);
2960
2961 if (!dev->param.is_yaffs2 && mark_flash &&
2962 bi->block_state != YAFFS_BLOCK_STATE_COLLECTING) {
2963
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);
2968 } else {
2969 dev->n_unmarked_deletions++;
2970 }
2971
2972
2973
2974
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);
2981 bi->pages_in_use--;
2982
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);
2988 }
2989 }
2990}
2991
2992static int yaffs_wr_data_obj(struct yaffs_obj *in, int inode_chunk,
2993 const u8 *buffer, int n_bytes, int use_reserve)
2994{
2995
2996
2997
2998
2999
3000 int prev_chunk_id;
3001 struct yaffs_ext_tags prev_tags;
3002 int new_chunk_id;
3003 struct yaffs_ext_tags new_tags;
3004 struct yaffs_dev *dev = in->my_dev;
3005
3006 yaffs_check_gc(dev, 0);
3007
3008
3009
3010
3011
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))
3015 return 0;
3016
3017
3018 memset(&new_tags, 0, sizeof(new_tags));
3019
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;
3025
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!!!!!!!!!",
3029 n_bytes);
3030 BUG();
3031 }
3032
3033 new_chunk_id =
3034 yaffs_write_new_chunk(dev, buffer, &new_tags, use_reserve);
3035
3036 if (new_chunk_id > 0) {
3037 yaffs_put_chunk_in_file(in, inode_chunk, new_chunk_id, 0);
3038
3039 if (prev_chunk_id > 0)
3040 yaffs_chunk_del(dev, prev_chunk_id, 1, __LINE__);
3041
3042 yaffs_verify_file_sane(in);
3043 }
3044 return new_chunk_id;
3045
3046}
3047
3048
3049
3050static int yaffs_do_xattrib_mod(struct yaffs_obj *obj, int set,
3051 const YCHAR *name, const void *value, int size,
3052 int flags)
3053{
3054 struct yaffs_xattr_mod xmod;
3055 int result;
3056
3057 xmod.set = set;
3058 xmod.name = name;
3059 xmod.data = value;
3060 xmod.size = size;
3061 xmod.flags = flags;
3062 xmod.result = -ENOSPC;
3063
3064 result = yaffs_update_oh(obj, NULL, 0, 0, 0, &xmod);
3065
3066 if (result > 0)
3067 return xmod.result;
3068 else
3069 return -ENOSPC;
3070}
3071
3072static int yaffs_apply_xattrib_mod(struct yaffs_obj *obj, char *buffer,
3073 struct yaffs_xattr_mod *xmod)
3074{
3075 int retval = 0;
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;
3080
3081 if (xmod->set)
3082 retval =
3083 nval_set(x_buffer, x_size, xmod->name, xmod->data,
3084 xmod->size, xmod->flags);
3085 else
3086 retval = nval_del(x_buffer, x_size, xmod->name);
3087
3088 obj->has_xattr = nval_hasvalues(x_buffer, x_size);
3089 obj->xattr_known = 1;
3090 xmod->result = retval;
3091
3092 return retval;
3093}
3094
3095static int yaffs_do_xattrib_fetch(struct yaffs_obj *obj, const YCHAR *name,
3096 void *value, int size)
3097{
3098 char *buffer = NULL;
3099 int result;
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);
3104 char *x_buffer;
3105 int retval = 0;
3106
3107 if (obj->hdr_chunk < 1)
3108 return -ENODATA;
3109
3110
3111
3112
3113 if (obj->xattr_known && !obj->has_xattr) {
3114 if (name)
3115 return -ENODATA;
3116 else
3117 return 0;
3118 }
3119
3120 buffer = (char *)yaffs_get_temp_buffer(dev);
3121 if (!buffer)
3122 return -ENOMEM;
3123
3124 result =
3125 yaffs_rd_chunk_tags_nand(dev, obj->hdr_chunk, (u8 *) buffer, &tags);
3126
3127 if (result != YAFFS_OK)
3128 retval = -ENOENT;
3129 else {
3130 x_buffer = buffer + x_offs;
3131
3132 if (!obj->xattr_known) {
3133 obj->has_xattr = nval_hasvalues(x_buffer, x_size);
3134 obj->xattr_known = 1;
3135 }
3136
3137 if (name)
3138 retval = nval_get(x_buffer, x_size, name, value, size);
3139 else
3140 retval = nval_list(x_buffer, x_size, value, size);
3141 }
3142 yaffs_release_temp_buffer(dev, (u8 *) buffer);
3143 return retval;
3144}
3145
3146int yaffs_set_xattrib(struct yaffs_obj *obj, const YCHAR * name,
3147 const void *value, int size, int flags)
3148{
3149 return yaffs_do_xattrib_mod(obj, 1, name, value, size, flags);
3150}
3151
3152int yaffs_remove_xattrib(struct yaffs_obj *obj, const YCHAR * name)
3153{
3154 return yaffs_do_xattrib_mod(obj, 0, name, NULL, 0, 0);
3155}
3156
3157int yaffs_get_xattrib(struct yaffs_obj *obj, const YCHAR * name, void *value,
3158 int size)
3159{
3160 return yaffs_do_xattrib_fetch(obj, name, value, size);
3161}
3162
3163int yaffs_list_xattrib(struct yaffs_obj *obj, char *buffer, int size)
3164{
3165 return yaffs_do_xattrib_fetch(obj, NULL, buffer, size);
3166}
3167
3168static void yaffs_check_obj_details_loaded(struct yaffs_obj *in)
3169{
3170 u8 *buf;
3171 struct yaffs_obj_hdr *oh;
3172 struct yaffs_dev *dev;
3173 struct yaffs_ext_tags tags;
3174
3175 if (!in || !in->lazy_loaded || in->hdr_chunk < 1)
3176 return;
3177
3178 dev = in->my_dev;
3179 in->lazy_loaded = 0;
3180 buf = yaffs_get_temp_buffer(dev);
3181
3182 yaffs_rd_chunk_tags_nand(dev, in->hdr_chunk, buf, &tags);
3183 oh = (struct yaffs_obj_hdr *)buf;
3184
3185 in->yst_mode = oh->yst_mode;
3186 yaffs_load_attribs(in, oh);
3187 yaffs_set_obj_name_from_oh(in, oh);
3188
3189 if (in->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) {
3190 in->variant.symlink_variant.alias =
3191 yaffs_clone_str(oh->alias);
3192 }
3193 yaffs_release_temp_buffer(dev, buf);
3194}
3195
3196static void yaffs_load_name_from_oh(struct yaffs_dev *dev, YCHAR *name,
3197 const YCHAR *oh_name, int buff_size)
3198{
3199#ifdef CONFIG_YAFFS_AUTO_UNICODE
3200 if (dev->param.auto_unicode) {
3201 if (*oh_name) {
3202
3203
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;
3208 name++;
3209 ascii_oh_name++;
3210 n--;
3211 }
3212 } else {
3213 yaffs_strncpy(name, oh_name + 1, buff_size - 1);
3214 }
3215 } else {
3216#else
3217 dev = dev;
3218 {
3219#endif
3220 yaffs_strncpy(name, oh_name, buff_size - 1);
3221 }
3222}
3223
3224static void yaffs_load_oh_from_name(struct yaffs_dev *dev, YCHAR *oh_name,
3225 const YCHAR *name)
3226{
3227#ifdef CONFIG_YAFFS_AUTO_UNICODE
3228
3229 int is_ascii;
3230 YCHAR *w;
3231
3232 if (dev->param.auto_unicode) {
3233
3234 is_ascii = 1;
3235 w = name;
3236
3237
3238 while (is_ascii && *w) {
3239 if ((*w) & 0xff00)
3240 is_ascii = 0;
3241 w++;
3242 }
3243
3244 if (is_ascii) {
3245
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;
3250 name++;
3251 ascii_oh_name++;
3252 n--;
3253 }
3254 } else {
3255
3256 *oh_name = 0;
3257 yaffs_strncpy(oh_name + 1, name, YAFFS_MAX_NAME_LENGTH - 2);
3258 }
3259 } else {
3260#else
3261 dev = dev;
3262 {
3263#endif
3264 yaffs_strncpy(oh_name, name, YAFFS_MAX_NAME_LENGTH - 1);
3265 }
3266}
3267
3268
3269
3270
3271int yaffs_update_oh(struct yaffs_obj *in, const YCHAR *name, int force,
3272 int is_shrink, int shadows, struct yaffs_xattr_mod *xmod)
3273{
3274
3275 struct yaffs_block_info *bi;
3276 struct yaffs_dev *dev = in->my_dev;
3277 int prev_chunk_id;
3278 int ret_val = 0;
3279 int new_chunk_id;
3280 struct yaffs_ext_tags new_tags;
3281 struct yaffs_ext_tags old_tags;
3282 const YCHAR *alias = NULL;
3283 u8 *buffer = NULL;
3284 YCHAR old_name[YAFFS_MAX_NAME_LENGTH + 1];
3285 struct yaffs_obj_hdr *oh = NULL;
3286 loff_t file_size = 0;
3287
3288 yaffs_strcpy(old_name, _Y("silly old name"));
3289
3290 if (in->fake && in != dev->root_dir && !force && !xmod)
3291 return ret_val;
3292
3293 yaffs_check_gc(dev, 0);
3294 yaffs_check_obj_details_loaded(in);
3295
3296 buffer = yaffs_get_temp_buffer(in->my_dev);
3297 oh = (struct yaffs_obj_hdr *)buffer;
3298
3299 prev_chunk_id = in->hdr_chunk;
3300
3301 if (prev_chunk_id > 0) {
3302 yaffs_rd_chunk_tags_nand(dev, prev_chunk_id,
3303 buffer, &old_tags);
3304
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));
3308 } else {
3309 memset(buffer, 0xff, dev->data_bytes_per_chunk);
3310 }
3311
3312 oh->type = in->variant_type;
3313 oh->yst_mode = in->yst_mode;
3314 oh->shadows_obj = oh->inband_shadowed_obj_id = shadows;
3315
3316 yaffs_load_attribs_oh(oh, in);
3317
3318 if (in->parent)
3319 oh->parent_obj_id = in->parent->obj_id;
3320 else
3321 oh->parent_obj_id = 0;
3322
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));
3328 } else {
3329 memset(oh->name, 0, sizeof(oh->name));
3330 }
3331
3332 oh->is_shrink = is_shrink;
3333
3334 switch (in->variant_type) {
3335 case YAFFS_OBJECT_TYPE_UNKNOWN:
3336
3337 break;
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);
3343 break;
3344 case YAFFS_OBJECT_TYPE_HARDLINK:
3345 oh->equiv_id = in->variant.hardlink_variant.equiv_id;
3346 break;
3347 case YAFFS_OBJECT_TYPE_SPECIAL:
3348
3349 break;
3350 case YAFFS_OBJECT_TYPE_DIRECTORY:
3351
3352 break;
3353 case YAFFS_OBJECT_TYPE_SYMLINK:
3354 alias = in->variant.symlink_variant.alias;
3355 if (!alias)
3356 alias = _Y("no alias");
3357 yaffs_strncpy(oh->alias, alias, YAFFS_MAX_ALIAS_LENGTH);
3358 oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
3359 break;
3360 }
3361
3362
3363 if (xmod)
3364 yaffs_apply_xattrib_mod(in, (char *)buffer, xmod);
3365
3366
3367 memset(&new_tags, 0, sizeof(new_tags));
3368 in->serial++;
3369 new_tags.chunk_id = 0;
3370 new_tags.obj_id = in->obj_id;
3371 new_tags.serial_number = in->serial;
3372
3373
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);
3382
3383
3384 new_chunk_id =
3385 yaffs_write_new_chunk(dev, buffer, &new_tags,
3386 (prev_chunk_id > 0) ? 1 : 0);
3387
3388 if (buffer)
3389 yaffs_release_temp_buffer(dev, buffer);
3390
3391 if (new_chunk_id < 0)
3392 return new_chunk_id;
3393
3394 in->hdr_chunk = new_chunk_id;
3395
3396 if (prev_chunk_id > 0)
3397 yaffs_chunk_del(dev, prev_chunk_id, 1, __LINE__);
3398
3399 if (!yaffs_obj_cache_dirty(in))
3400 in->dirty = 0;
3401
3402
3403
3404 if (is_shrink) {
3405 bi = yaffs_get_block_info(in->my_dev,
3406 new_chunk_id /
3407 in->my_dev->param.chunks_per_block);
3408 bi->has_shrink_hdr = 1;
3409 }
3410
3411
3412 return new_chunk_id;
3413}
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425int yaffs_file_rd(struct yaffs_obj *in, u8 * buffer, loff_t offset, int n_bytes)
3426{
3427 int chunk;
3428 u32 start;
3429 int n_copy;
3430 int n = n_bytes;
3431 int n_done = 0;
3432 struct yaffs_cache *cache;
3433 struct yaffs_dev *dev;
3434
3435 dev = in->my_dev;
3436
3437 while (n > 0) {
3438 yaffs_addr_to_chunk(dev, offset, &chunk, &start);
3439 chunk++;
3440
3441
3442
3443
3444 if ((start + n) < dev->data_bytes_per_chunk)
3445 n_copy = n;
3446 else
3447 n_copy = dev->data_bytes_per_chunk - start;
3448
3449 cache = yaffs_find_chunk_cache(in, chunk);
3450
3451
3452
3453
3454
3455 if (cache || n_copy != dev->data_bytes_per_chunk ||
3456 dev->param.inband_tags) {
3457 if (dev->param.n_caches > 0) {
3458
3459
3460
3461
3462 if (!cache) {
3463 cache =
3464 yaffs_grab_chunk_cache(in->my_dev);
3465 cache->object = in;
3466 cache->chunk_id = chunk;
3467 cache->dirty = 0;
3468 cache->locked = 0;
3469 yaffs_rd_data_obj(in, chunk,
3470 cache->data);
3471 cache->n_bytes = 0;
3472 }
3473
3474 yaffs_use_cache(dev, cache, 0);
3475
3476 cache->locked = 1;
3477
3478 memcpy(buffer, &cache->data[start], n_copy);
3479
3480 cache->locked = 0;
3481 } else {
3482
3483
3484 u8 *local_buffer =
3485 yaffs_get_temp_buffer(dev);
3486 yaffs_rd_data_obj(in, chunk, local_buffer);
3487
3488 memcpy(buffer, &local_buffer[start], n_copy);
3489
3490 yaffs_release_temp_buffer(dev, local_buffer);
3491 }
3492 } else {
3493
3494 yaffs_rd_data_obj(in, chunk, buffer);
3495 }
3496 n -= n_copy;
3497 offset += n_copy;
3498 buffer += n_copy;
3499 n_done += n_copy;
3500 }
3501 return n_done;
3502}
3503
3504int yaffs_do_file_wr(struct yaffs_obj *in, const u8 *buffer, loff_t offset,
3505 int n_bytes, int write_through)
3506{
3507
3508 int chunk;
3509 u32 start;
3510 int n_copy;
3511 int n = n_bytes;
3512 int n_done = 0;
3513 int n_writeback;
3514 loff_t start_write = offset;
3515 int chunk_written = 0;
3516 u32 n_bytes_read;
3517 loff_t chunk_start;
3518 struct yaffs_dev *dev;
3519
3520 dev = in->my_dev;
3521
3522 while (n > 0 && chunk_written >= 0) {
3523 yaffs_addr_to_chunk(dev, offset, &chunk, &start);
3524
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);
3531 }
3532 chunk++;
3533
3534
3535
3536
3537
3538 if ((start + n) < dev->data_bytes_per_chunk) {
3539 n_copy = n;
3540
3541
3542
3543
3544
3545
3546
3547 chunk_start = (((loff_t)(chunk - 1)) *
3548 dev->data_bytes_per_chunk);
3549
3550 if (chunk_start > in->variant.file_variant.file_size)
3551 n_bytes_read = 0;
3552 else
3553 n_bytes_read =
3554 in->variant.file_variant.file_size -
3555 chunk_start;
3556
3557 if (n_bytes_read > dev->data_bytes_per_chunk)
3558 n_bytes_read = dev->data_bytes_per_chunk;
3559
3560 n_writeback =
3561 (n_bytes_read >
3562 (start + n)) ? n_bytes_read : (start + n);
3563
3564 if (n_writeback < 0 ||
3565 n_writeback > dev->data_bytes_per_chunk)
3566 BUG();
3567
3568 } else {
3569 n_copy = dev->data_bytes_per_chunk - start;
3570 n_writeback = dev->data_bytes_per_chunk;
3571 }
3572
3573 if (n_copy != dev->data_bytes_per_chunk ||
3574 dev->param.inband_tags) {
3575
3576
3577
3578
3579 if (dev->param.n_caches > 0) {
3580 struct yaffs_cache *cache;
3581
3582
3583
3584 cache = yaffs_find_chunk_cache(in, chunk);
3585
3586 if (!cache &&
3587 yaffs_check_alloc_available(dev, 1)) {
3588 cache = yaffs_grab_chunk_cache(dev);
3589 cache->object = in;
3590 cache->chunk_id = chunk;
3591 cache->dirty = 0;
3592 cache->locked = 0;
3593 yaffs_rd_data_obj(in, chunk,
3594 cache->data);
3595 } else if (cache &&
3596 !cache->dirty &&
3597 !yaffs_check_alloc_available(dev,
3598 1)) {
3599
3600
3601
3602
3603 cache = NULL;
3604 }
3605
3606 if (cache) {
3607 yaffs_use_cache(dev, cache, 1);
3608 cache->locked = 1;
3609
3610 memcpy(&cache->data[start], buffer,
3611 n_copy);
3612
3613 cache->locked = 0;
3614 cache->n_bytes = n_writeback;
3615
3616 if (write_through) {
3617 chunk_written =
3618 yaffs_wr_data_obj
3619 (cache->object,
3620 cache->chunk_id,
3621 cache->data,
3622 cache->n_bytes, 1);
3623 cache->dirty = 0;
3624 }
3625 } else {
3626 chunk_written = -1;
3627 }
3628 } else {
3629
3630
3631
3632
3633
3634 u8 *local_buffer = yaffs_get_temp_buffer(dev);
3635
3636 yaffs_rd_data_obj(in, chunk, local_buffer);
3637 memcpy(&local_buffer[start], buffer, n_copy);
3638
3639 chunk_written =
3640 yaffs_wr_data_obj(in, chunk,
3641 local_buffer,
3642 n_writeback, 0);
3643
3644 yaffs_release_temp_buffer(dev, local_buffer);
3645 }
3646 } else {
3647
3648
3649 chunk_written =
3650 yaffs_wr_data_obj(in, chunk, buffer,
3651 dev->data_bytes_per_chunk, 0);
3652
3653
3654
3655 yaffs_invalidate_chunk_cache(in, chunk);
3656 }
3657
3658 if (chunk_written >= 0) {
3659 n -= n_copy;
3660 offset += n_copy;
3661 buffer += n_copy;
3662 n_done += n_copy;
3663 }
3664 }
3665
3666
3667
3668 if ((start_write + n_done) > in->variant.file_variant.file_size)
3669 in->variant.file_variant.file_size = (start_write + n_done);
3670
3671 in->dirty = 1;
3672 return n_done;
3673}
3674
3675int yaffs_wr_file(struct yaffs_obj *in, const u8 *buffer, loff_t offset,
3676 int n_bytes, int write_through)
3677{
3678 yaffs2_handle_hole(in, offset);
3679 return yaffs_do_file_wr(in, buffer, offset, n_bytes, write_through);
3680}
3681
3682
3683
3684static void yaffs_prune_chunks(struct yaffs_obj *in, loff_t new_size)
3685{
3686
3687 struct yaffs_dev *dev = in->my_dev;
3688 loff_t old_size = in->variant.file_variant.file_size;
3689 int i;
3690 int chunk_id;
3691 u32 dummy;
3692 int last_del;
3693 int start_del;
3694
3695 if (old_size > 0)
3696 yaffs_addr_to_chunk(dev, old_size - 1, &last_del, &dummy);
3697 else
3698 last_del = 0;
3699
3700 yaffs_addr_to_chunk(dev, new_size + dev->data_bytes_per_chunk - 1,
3701 &start_del, &dummy);
3702 last_del++;
3703 start_del++;
3704
3705
3706
3707
3708 for (i = last_del; i >= start_del; i--) {
3709
3710
3711
3712
3713
3714 chunk_id = yaffs_find_del_file_chunk(in, i, NULL);
3715
3716 if (chunk_id < 1)
3717 continue;
3718
3719 if (chunk_id <
3720 (dev->internal_start_block * dev->param.chunks_per_block) ||
3721 chunk_id >=
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",
3726 chunk_id, i);
3727 } else {
3728 in->n_data_chunks--;
3729 yaffs_chunk_del(dev, chunk_id, 1, __LINE__);
3730 }
3731 }
3732}
3733
3734void yaffs_resize_file_down(struct yaffs_obj *obj, loff_t new_size)
3735{
3736 int new_full;
3737 u32 new_partial;
3738 struct yaffs_dev *dev = obj->my_dev;
3739
3740 yaffs_addr_to_chunk(dev, new_size, &new_full, &new_partial);
3741
3742 yaffs_prune_chunks(obj, new_size);
3743
3744 if (new_partial != 0) {
3745 int last_chunk = 1 + new_full;
3746 u8 *local_buffer = yaffs_get_temp_buffer(dev);
3747
3748
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);
3752
3753 yaffs_wr_data_obj(obj, last_chunk, local_buffer,
3754 new_partial, 1);
3755
3756 yaffs_release_temp_buffer(dev, local_buffer);
3757 }
3758
3759 obj->variant.file_variant.file_size = new_size;
3760
3761 yaffs_prune_tree(dev, &obj->variant.file_variant);
3762}
3763
3764int yaffs_resize_file(struct yaffs_obj *in, loff_t new_size)
3765{
3766 struct yaffs_dev *dev = in->my_dev;
3767 loff_t old_size = in->variant.file_variant.file_size;
3768
3769 yaffs_flush_file_cache(in);
3770 yaffs_invalidate_whole_cache(in);
3771
3772 yaffs_check_gc(dev, 0);
3773
3774 if (in->variant_type != YAFFS_OBJECT_TYPE_FILE)
3775 return YAFFS_FAIL;
3776
3777 if (new_size == old_size)
3778 return YAFFS_OK;
3779
3780 if (new_size > old_size) {
3781 yaffs2_handle_hole(in, new_size);
3782 in->variant.file_variant.file_size = new_size;
3783 } else {
3784
3785 yaffs_resize_file_down(in, new_size);
3786 }
3787
3788
3789
3790
3791
3792
3793 if (in->parent &&
3794 !in->is_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);
3798
3799 return YAFFS_OK;
3800}
3801
3802int yaffs_flush_file(struct yaffs_obj *in, int update_time, int data_sync)
3803{
3804 if (!in->dirty)
3805 return YAFFS_OK;
3806
3807 yaffs_flush_file_cache(in);
3808
3809 if (data_sync)
3810 return YAFFS_OK;
3811
3812 if (update_time)
3813 yaffs_load_current_time(in, 0, 0);
3814
3815 return (yaffs_update_oh(in, NULL, 0, 0, 0, NULL) >= 0) ?
3816 YAFFS_OK : YAFFS_FAIL;
3817}
3818
3819
3820
3821
3822
3823
3824static int yaffs_unlink_file_if_needed(struct yaffs_obj *in)
3825{
3826 int ret_val;
3827 int del_now = 0;
3828 struct yaffs_dev *dev = in->my_dev;
3829
3830 if (!in->my_inode)
3831 del_now = 1;
3832
3833 if (del_now) {
3834 ret_val =
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",
3839 in->obj_id);
3840 in->deleted = 1;
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);
3845 } else {
3846 ret_val =
3847 yaffs_change_obj_name(in, in->my_dev->unlinked_dir,
3848 _Y("unlinked"), 0, 0);
3849 }
3850 return ret_val;
3851}
3852
3853int yaffs_del_file(struct yaffs_obj *in)
3854{
3855 int ret_val = YAFFS_OK;
3856 int deleted;
3857 struct yaffs_dev *dev = in->my_dev;
3858
3859 if (dev->param.disable_soft_del || dev->param.is_yaffs2)
3860 yaffs_resize_file(in, 0);
3861
3862 if (in->n_data_chunks > 0) {
3863
3864
3865
3866 if (!in->unlinked)
3867 ret_val = yaffs_unlink_file_if_needed(in);
3868
3869 deleted = in->deleted;
3870
3871 if (ret_val == YAFFS_OK && in->unlinked && !in->deleted) {
3872 in->deleted = 1;
3873 deleted = 1;
3874 in->my_dev->n_deleted_files++;
3875 yaffs_soft_del_file(in);
3876 }
3877 return deleted ? YAFFS_OK : YAFFS_FAIL;
3878 } else {
3879
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);
3883
3884 return YAFFS_OK;
3885 }
3886}
3887
3888int yaffs_is_non_empty_dir(struct yaffs_obj *obj)
3889{
3890 return (obj &&
3891 obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) &&
3892 !(list_empty(&obj->variant.dir_variant.children));
3893}
3894
3895static int yaffs_del_dir(struct yaffs_obj *obj)
3896{
3897
3898 if (yaffs_is_non_empty_dir(obj))
3899 return YAFFS_FAIL;
3900
3901 return yaffs_generic_obj_del(obj);
3902}
3903
3904static int yaffs_del_symlink(struct yaffs_obj *in)
3905{
3906 kfree(in->variant.symlink_variant.alias);
3907 in->variant.symlink_variant.alias = NULL;
3908
3909 return yaffs_generic_obj_del(in);
3910}
3911
3912static int yaffs_del_link(struct yaffs_obj *in)
3913{
3914
3915
3916
3917 list_del_init(&in->hard_links);
3918 return yaffs_generic_obj_del(in);
3919}
3920
3921int yaffs_del_obj(struct yaffs_obj *obj)
3922{
3923 int ret_val = -1;
3924
3925 switch (obj->variant_type) {
3926 case YAFFS_OBJECT_TYPE_FILE:
3927 ret_val = yaffs_del_file(obj);
3928 break;
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",
3933 obj->obj_id);
3934 list_del_init(&obj->variant.dir_variant.dirty);
3935 }
3936 return yaffs_del_dir(obj);
3937 break;
3938 case YAFFS_OBJECT_TYPE_SYMLINK:
3939 ret_val = yaffs_del_symlink(obj);
3940 break;
3941 case YAFFS_OBJECT_TYPE_HARDLINK:
3942 ret_val = yaffs_del_link(obj);
3943 break;
3944 case YAFFS_OBJECT_TYPE_SPECIAL:
3945 ret_val = yaffs_generic_obj_del(obj);
3946 break;
3947 case YAFFS_OBJECT_TYPE_UNKNOWN:
3948 ret_val = 0;
3949 break;
3950 }
3951 return ret_val;
3952}
3953
3954static int yaffs_unlink_worker(struct yaffs_obj *obj)
3955{
3956 int del_now = 0;
3957
3958 if (!obj)
3959 return YAFFS_FAIL;
3960
3961 if (!obj->my_inode)
3962 del_now = 1;
3963
3964 yaffs_update_parent(obj->parent);
3965
3966 if (obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) {
3967 return yaffs_del_link(obj);
3968 } else if (!list_empty(&obj->hard_links)) {
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983 struct yaffs_obj *hl;
3984 struct yaffs_obj *parent;
3985 int ret_val;
3986 YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
3987
3988 hl = list_entry(obj->hard_links.next, struct yaffs_obj,
3989 hard_links);
3990
3991 yaffs_get_obj_name(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
3992 parent = hl->parent;
3993
3994 list_del_init(&hl->hard_links);
3995
3996 yaffs_add_obj_to_dir(obj->my_dev->unlinked_dir, hl);
3997
3998 ret_val = yaffs_change_obj_name(obj, parent, name, 0, 0);
3999
4000 if (ret_val == YAFFS_OK)
4001 ret_val = yaffs_generic_obj_del(hl);
4002
4003 return ret_val;
4004
4005 } else if (del_now) {
4006 switch (obj->variant_type) {
4007 case YAFFS_OBJECT_TYPE_FILE:
4008 return yaffs_del_file(obj);
4009 break;
4010 case YAFFS_OBJECT_TYPE_DIRECTORY:
4011 list_del_init(&obj->variant.dir_variant.dirty);
4012 return yaffs_del_dir(obj);
4013 break;
4014 case YAFFS_OBJECT_TYPE_SYMLINK:
4015 return yaffs_del_symlink(obj);
4016 break;
4017 case YAFFS_OBJECT_TYPE_SPECIAL:
4018 return yaffs_generic_obj_del(obj);
4019 break;
4020 case YAFFS_OBJECT_TYPE_HARDLINK:
4021 case YAFFS_OBJECT_TYPE_UNKNOWN:
4022 default:
4023 return YAFFS_FAIL;
4024 }
4025 } else if (yaffs_is_non_empty_dir(obj)) {
4026 return YAFFS_FAIL;
4027 } else {
4028 return yaffs_change_obj_name(obj, obj->my_dev->unlinked_dir,
4029 _Y("unlinked"), 0, 0);
4030 }
4031}
4032
4033static int yaffs_unlink_obj(struct yaffs_obj *obj)
4034{
4035 if (obj && obj->unlink_allowed)
4036 return yaffs_unlink_worker(obj);
4037
4038 return YAFFS_FAIL;
4039}
4040
4041int yaffs_unlinker(struct yaffs_obj *dir, const YCHAR *name)
4042{
4043 struct yaffs_obj *obj;
4044
4045 obj = yaffs_find_by_name(dir, name);
4046 return yaffs_unlink_obj(obj);
4047}
4048
4049
4050
4051
4052int yaffs_rename_obj(struct yaffs_obj *old_dir, const YCHAR *old_name,
4053 struct yaffs_obj *new_dir, const YCHAR *new_name)
4054{
4055 struct yaffs_obj *obj = NULL;
4056 struct yaffs_obj *existing_target = NULL;
4057 int force = 0;
4058 int result;
4059 struct yaffs_dev *dev;
4060
4061 if (!old_dir || old_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
4062 BUG();
4063 return YAFFS_FAIL;
4064 }
4065 if (!new_dir || new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
4066 BUG();
4067 return YAFFS_FAIL;
4068 }
4069
4070 dev = old_dir->my_dev;
4071
4072#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
4073
4074
4075
4076
4077 if (old_dir == new_dir &&
4078 old_name && new_name &&
4079 yaffs_strcmp(old_name, new_name) == 0)
4080 force = 1;
4081#endif
4082
4083 if (yaffs_strnlen(new_name, YAFFS_MAX_NAME_LENGTH + 1) >
4084 YAFFS_MAX_NAME_LENGTH)
4085
4086 return YAFFS_FAIL;
4087
4088 if (old_name)
4089 obj = yaffs_find_by_name(old_dir, old_name);
4090 else{
4091 obj = old_dir;
4092 old_dir = obj->parent;
4093 }
4094
4095 if (obj && obj->rename_allowed) {
4096
4097 existing_target = yaffs_find_by_name(new_dir, new_name);
4098 if (yaffs_is_non_empty_dir(existing_target)) {
4099 return YAFFS_FAIL;
4100 } else if (existing_target && existing_target != obj) {
4101
4102
4103
4104
4105
4106
4107
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;
4114 }
4115
4116 result = yaffs_change_obj_name(obj, new_dir, new_name, 1, 0);
4117
4118 yaffs_update_parent(old_dir);
4119 if (new_dir != old_dir)
4120 yaffs_update_parent(new_dir);
4121
4122 return result;
4123 }
4124 return YAFFS_FAIL;
4125}
4126
4127
4128
4129void yaffs_handle_shadowed_obj(struct yaffs_dev *dev, int obj_id,
4130 int backward_scanning)
4131{
4132 struct yaffs_obj *obj;
4133
4134 if (backward_scanning) {
4135
4136
4137
4138 obj = yaffs_find_by_number(dev, obj_id);
4139 if (obj)
4140 return;
4141 }
4142
4143
4144
4145
4146
4147 obj =
4148 yaffs_find_or_create_by_number(dev, obj_id, YAFFS_OBJECT_TYPE_FILE);
4149 if (!obj)
4150 return;
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;
4155}
4156
4157void yaffs_link_fixup(struct yaffs_dev *dev, struct list_head *hard_list)
4158{
4159 struct list_head *lh;
4160 struct list_head *save;
4161 struct yaffs_obj *hl;
4162 struct yaffs_obj *in;
4163
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);
4168
4169 if (in) {
4170
4171 hl->variant.hardlink_variant.equiv_obj = in;
4172 list_add(&hl->hard_links, &in->hard_links);
4173 } else {
4174
4175
4176
4177 hl->variant.hardlink_variant.equiv_obj = NULL;
4178 INIT_LIST_HEAD(&hl->hard_links);
4179 }
4180 }
4181}
4182
4183static void yaffs_strip_deleted_objs(struct yaffs_dev *dev)
4184{
4185
4186
4187
4188 struct list_head *i;
4189 struct list_head *n;
4190 struct yaffs_obj *l;
4191
4192 if (dev->read_only)
4193 return;
4194
4195
4196 list_for_each_safe(i, n,
4197 &dev->unlinked_dir->variant.dir_variant.children) {
4198 l = list_entry(i, struct yaffs_obj, siblings);
4199 yaffs_del_obj(l);
4200 }
4201
4202 list_for_each_safe(i, n, &dev->del_dir->variant.dir_variant.children) {
4203 l = list_entry(i, struct yaffs_obj, siblings);
4204 yaffs_del_obj(l);
4205 }
4206}
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226static int yaffs_has_null_parent(struct yaffs_dev *dev, struct yaffs_obj *obj)
4227{
4228 return (obj == dev->del_dir ||
4229 obj == dev->unlinked_dir || obj == dev->root_dir);
4230}
4231
4232static void yaffs_fix_hanging_objs(struct yaffs_dev *dev)
4233{
4234 struct yaffs_obj *obj;
4235 struct yaffs_obj *parent;
4236 int i;
4237 struct list_head *lh;
4238 struct list_head *n;
4239 int depth_limit;
4240 int hanging;
4241
4242 if (dev->read_only)
4243 return;
4244
4245
4246
4247
4248
4249
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;
4254
4255 if (yaffs_has_null_parent(dev, obj)) {
4256
4257 hanging = 0;
4258 } else if (!parent ||
4259 parent->variant_type !=
4260 YAFFS_OBJECT_TYPE_DIRECTORY) {
4261 hanging = 1;
4262 } else if (yaffs_has_null_parent(dev, parent)) {
4263 hanging = 0;
4264 } else {
4265
4266
4267
4268
4269 hanging = 0;
4270 depth_limit = 100;
4271
4272 while (parent != dev->root_dir &&
4273 parent->parent &&
4274 parent->parent->variant_type ==
4275 YAFFS_OBJECT_TYPE_DIRECTORY &&
4276 depth_limit > 0) {
4277 parent = parent->parent;
4278 depth_limit--;
4279 }
4280 if (parent != dev->root_dir)
4281 hanging = 1;
4282 }
4283 if (hanging) {
4284 yaffs_trace(YAFFS_TRACE_SCAN,
4285 "Hanging object %d moved to lost and found",
4286 obj->obj_id);
4287 yaffs_add_obj_to_dir(dev->lost_n_found, obj);
4288 }
4289 }
4290 }
4291}
4292
4293
4294
4295
4296static void yaffs_del_dir_contents(struct yaffs_obj *dir)
4297{
4298 struct yaffs_obj *obj;
4299 struct list_head *lh;
4300 struct list_head *n;
4301
4302 if (dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
4303 BUG();
4304
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",
4311 obj->obj_id);
4312 yaffs_unlink_obj(obj);
4313 }
4314}
4315
4316static void yaffs_empty_l_n_f(struct yaffs_dev *dev)
4317{
4318 yaffs_del_dir_contents(dev->lost_n_found);
4319}
4320
4321
4322struct yaffs_obj *yaffs_find_by_name(struct yaffs_obj *directory,
4323 const YCHAR *name)
4324{
4325 int sum;
4326 struct list_head *i;
4327 YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
4328 struct yaffs_obj *l;
4329
4330 if (!name)
4331 return NULL;
4332
4333 if (!directory) {
4334 yaffs_trace(YAFFS_TRACE_ALWAYS,
4335 "tragedy: yaffs_find_by_name: null pointer directory"
4336 );
4337 BUG();
4338 return NULL;
4339 }
4340 if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
4341 yaffs_trace(YAFFS_TRACE_ALWAYS,
4342 "tragedy: yaffs_find_by_name: non-directory"
4343 );
4344 BUG();
4345 }
4346
4347 sum = yaffs_calc_name_sum(name);
4348
4349 list_for_each(i, &directory->variant.dir_variant.children) {
4350 l = list_entry(i, struct yaffs_obj, siblings);
4351
4352 if (l->parent != directory)
4353 BUG();
4354
4355 yaffs_check_obj_details_loaded(l);
4356
4357
4358 if (l->obj_id == YAFFS_OBJECTID_LOSTNFOUND) {
4359 if (!yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME))
4360 return l;
4361 } else if (l->sum == sum || l->hdr_chunk <= 0) {
4362
4363
4364
4365 yaffs_get_obj_name(l, buffer,
4366 YAFFS_MAX_NAME_LENGTH + 1);
4367 if (!yaffs_strncmp(name, buffer, YAFFS_MAX_NAME_LENGTH))
4368 return l;
4369 }
4370 }
4371 return NULL;
4372}
4373
4374
4375
4376
4377
4378struct yaffs_obj *yaffs_get_equivalent_obj(struct yaffs_obj *obj)
4379{
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);
4383 }
4384 return obj;
4385}
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406static void yaffs_fix_null_name(struct yaffs_obj *obj, YCHAR *name,
4407 int buffer_size)
4408{
4409
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;
4415 num_string[19] = 0;
4416 while (v > 0) {
4417 x--;
4418 *x = '0' + (v % 10);
4419 v /= 10;
4420 }
4421
4422 yaffs_strcpy(local_name, YAFFS_LOSTNFOUND_PREFIX);
4423 yaffs_strcat(local_name, x);
4424 yaffs_strncpy(name, local_name, buffer_size - 1);
4425 }
4426}
4427
4428int yaffs_get_obj_name(struct yaffs_obj *obj, YCHAR *name, int buffer_size)
4429{
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);
4438
4439 struct yaffs_obj_hdr *oh = (struct yaffs_obj_hdr *)buffer;
4440
4441 memset(buffer, 0, obj->my_dev->data_bytes_per_chunk);
4442
4443 if (obj->hdr_chunk > 0) {
4444 yaffs_rd_chunk_tags_nand(obj->my_dev,
4445 obj->hdr_chunk,
4446 buffer, NULL);
4447 }
4448 yaffs_load_name_from_oh(obj->my_dev, name, oh->name,
4449 buffer_size);
4450
4451 yaffs_release_temp_buffer(obj->my_dev, buffer);
4452 }
4453
4454 yaffs_fix_null_name(obj, name, buffer_size);
4455
4456 return yaffs_strnlen(name, YAFFS_MAX_NAME_LENGTH);
4457}
4458
4459loff_t yaffs_get_obj_length(struct yaffs_obj *obj)
4460{
4461
4462 obj = yaffs_get_equivalent_obj(obj);
4463
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)
4468 return 0;
4469 return yaffs_strnlen(obj->variant.symlink_variant.alias,
4470 YAFFS_MAX_ALIAS_LENGTH);
4471 } else {
4472
4473 return obj->my_dev->data_bytes_per_chunk;
4474 }
4475}
4476
4477int yaffs_get_obj_link_count(struct yaffs_obj *obj)
4478{
4479 int count = 0;
4480 struct list_head *i;
4481
4482 if (!obj->unlinked)
4483 count++;
4484
4485 list_for_each(i, &obj->hard_links)
4486 count++;
4487
4488 return count;
4489}
4490
4491int yaffs_get_obj_inode(struct yaffs_obj *obj)
4492{
4493 obj = yaffs_get_equivalent_obj(obj);
4494
4495 return obj->obj_id;
4496}
4497
4498unsigned yaffs_get_obj_type(struct yaffs_obj *obj)
4499{
4500 obj = yaffs_get_equivalent_obj(obj);
4501
4502 switch (obj->variant_type) {
4503 case YAFFS_OBJECT_TYPE_FILE:
4504 return DT_REG;
4505 break;
4506 case YAFFS_OBJECT_TYPE_DIRECTORY:
4507 return DT_DIR;
4508 break;
4509 case YAFFS_OBJECT_TYPE_SYMLINK:
4510 return DT_LNK;
4511 break;
4512 case YAFFS_OBJECT_TYPE_HARDLINK:
4513 return DT_REG;
4514 break;
4515 case YAFFS_OBJECT_TYPE_SPECIAL:
4516 if (S_ISFIFO(obj->yst_mode))
4517 return DT_FIFO;
4518 if (S_ISCHR(obj->yst_mode))
4519 return DT_CHR;
4520 if (S_ISBLK(obj->yst_mode))
4521 return DT_BLK;
4522 if (S_ISSOCK(obj->yst_mode))
4523 return DT_SOCK;
4524 return DT_REG;
4525 break;
4526 default:
4527 return DT_REG;
4528 break;
4529 }
4530}
4531
4532YCHAR *yaffs_get_symlink_alias(struct yaffs_obj *obj)
4533{
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);
4537 else
4538 return yaffs_clone_str(_Y(""));
4539}
4540
4541
4542
4543static int yaffs_check_dev_fns(const struct yaffs_dev *dev)
4544{
4545
4546 if (!dev->param.erase_fn || !dev->param.initialise_flash_fn)
4547 return 0;
4548
4549
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)
4555 return 1;
4556
4557
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)
4564 return 1;
4565
4566 return 0;
4567}
4568
4569static int yaffs_create_initial_dir(struct yaffs_dev *dev)
4570{
4571
4572 dev->lost_n_found = dev->root_dir = NULL;
4573 dev->unlinked_dir = dev->del_dir = NULL;
4574 dev->unlinked_dir =
4575 yaffs_create_fake_dir(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
4576 dev->del_dir =
4577 yaffs_create_fake_dir(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
4578 dev->root_dir =
4579 yaffs_create_fake_dir(dev, YAFFS_OBJECTID_ROOT,
4580 YAFFS_ROOT_MODE | S_IFDIR);
4581 dev->lost_n_found =
4582 yaffs_create_fake_dir(dev, YAFFS_OBJECTID_LOSTNFOUND,
4583 YAFFS_LOSTNFOUND_MODE | S_IFDIR);
4584
4585 if (dev->lost_n_found && dev->root_dir && dev->unlinked_dir
4586 && dev->del_dir) {
4587 yaffs_add_obj_to_dir(dev->root_dir, dev->lost_n_found);
4588 return YAFFS_OK;
4589 }
4590 return YAFFS_FAIL;
4591}
4592
4593int yaffs_guts_initialise(struct yaffs_dev *dev)
4594{
4595 int init_failed = 0;
4596 unsigned x;
4597 int bits;
4598
4599 yaffs_trace(YAFFS_TRACE_TRACING, "yaffs: yaffs_guts_initialise()");
4600
4601
4602
4603 if (!dev) {
4604 yaffs_trace(YAFFS_TRACE_ALWAYS,
4605 "yaffs: Need a device"
4606 );
4607 return YAFFS_FAIL;
4608 }
4609
4610 if (dev->is_mounted) {
4611 yaffs_trace(YAFFS_TRACE_ALWAYS, "device already mounted");
4612 return YAFFS_FAIL;
4613 }
4614
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;
4620
4621 dev->gc_block = 0;
4622
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;
4628 }
4629
4630
4631
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)
4643 ) {
4644
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);
4650 return YAFFS_FAIL;
4651 }
4652
4653 if (yaffs_init_nand(dev) != YAFFS_OK) {
4654 yaffs_trace(YAFFS_TRACE_ALWAYS, "InitialiseNAND failed");
4655 return YAFFS_FAIL;
4656 }
4657
4658
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);
4663 else
4664 dev->data_bytes_per_chunk = dev->param.total_bytes_per_chunk;
4665
4666
4667 if (!yaffs_check_dev_fns(dev)) {
4668
4669 yaffs_trace(YAFFS_TRACE_ALWAYS,
4670 "device function(s) missing or wrong");
4671
4672 return YAFFS_FAIL;
4673 }
4674
4675
4676
4677 dev->is_mounted = 1;
4678
4679
4680
4681
4682
4683
4684 x = dev->data_bytes_per_chunk;
4685
4686 dev->chunk_shift = calc_shifts(x);
4687 x >>= dev->chunk_shift;
4688 dev->chunk_div = x;
4689
4690 dev->chunk_mask = (1 << dev->chunk_shift) - 1;
4691
4692
4693
4694
4695
4696
4697 x = dev->param.chunks_per_block * (dev->internal_end_block + 1);
4698
4699 bits = calc_shifts_ceiling(x);
4700
4701
4702 if (!dev->param.wide_tnodes_disabled) {
4703
4704 if (bits & 1)
4705 bits++;
4706 if (bits < 16)
4707 dev->tnode_width = 16;
4708 else
4709 dev->tnode_width = bits;
4710 } else {
4711 dev->tnode_width = 16;
4712 }
4713
4714 dev->tnode_mask = (1 << dev->tnode_width) - 1;
4715
4716
4717
4718
4719
4720
4721
4722 if (bits <= dev->tnode_width)
4723 dev->chunk_grp_bits = 0;
4724 else
4725 dev->chunk_grp_bits = bits - dev->tnode_width;
4726
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);
4730
4731 dev->chunk_grp_size = 1 << dev->chunk_grp_bits;
4732
4733 if (dev->param.chunks_per_block < dev->chunk_grp_size) {
4734
4735
4736
4737
4738 yaffs_trace(YAFFS_TRACE_ALWAYS, "chunk group too large");
4739
4740 return YAFFS_FAIL;
4741 }
4742
4743
4744
4745
4746 dev->all_gcs = 0;
4747 dev->passive_gc_count = 0;
4748 dev->oldest_dirty_gc_count = 0;
4749 dev->bg_gcs = 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
4765 INIT_LIST_HEAD(&dev->dirty_dirs);
4766 dev->oldest_dirty_seq = 0;
4767 dev->oldest_dirty_block = 0;
4768
4769
4770 if (!yaffs_init_tmp_buffers(dev))
4771 init_failed = 1;
4772
4773 dev->cache = NULL;
4774 dev->gc_cleanup_list = NULL;
4775
4776 if (!init_failed && dev->param.n_caches > 0) {
4777 int i;
4778 void *buf;
4779 int cache_bytes =
4780 dev->param.n_caches * sizeof(struct yaffs_cache);
4781
4782 if (dev->param.n_caches > YAFFS_MAX_SHORT_OP_CACHES)
4783 dev->param.n_caches = YAFFS_MAX_SHORT_OP_CACHES;
4784
4785 dev->cache = kmalloc(cache_bytes, GFP_NOFS);
4786
4787 buf = (u8 *) dev->cache;
4788
4789 if (dev->cache)
4790 memset(dev->cache, 0, cache_bytes);
4791
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);
4798 }
4799 if (!buf)
4800 init_failed = 1;
4801
4802 dev->cache_last_use = 0;
4803 }
4804
4805 dev->cache_hits = 0;
4806
4807 if (!init_failed) {
4808 dev->gc_cleanup_list =
4809 kmalloc(dev->param.chunks_per_block * sizeof(u32),
4810 GFP_NOFS);
4811 if (!dev->gc_cleanup_list)
4812 init_failed = 1;
4813 }
4814
4815 if (dev->param.is_yaffs2)
4816 dev->param.use_header_file_size = 1;
4817
4818 if (!init_failed && !yaffs_init_blocks(dev))
4819 init_failed = 1;
4820
4821 yaffs_init_tnodes_and_objs(dev);
4822
4823 if (!init_failed && !yaffs_create_initial_dir(dev))
4824 init_failed = 1;
4825
4826 if (!init_failed && dev->param.is_yaffs2 &&
4827 !dev->param.disable_summary &&
4828 !yaffs_summary_init(dev))
4829 init_failed = 1;
4830
4831 if (!init_failed) {
4832
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 |
4837 YAFFS_TRACE_MOUNT,
4838 "yaffs: restored from checkpoint"
4839 );
4840 } else {
4841
4842
4843
4844
4845 yaffs_deinit_blocks(dev);
4846
4847 yaffs_deinit_tnodes_and_objs(dev);
4848
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;
4856
4857 if (!init_failed && !yaffs_init_blocks(dev))
4858 init_failed = 1;
4859
4860 yaffs_init_tnodes_and_objs(dev);
4861
4862 if (!init_failed
4863 && !yaffs_create_initial_dir(dev))
4864 init_failed = 1;
4865
4866 if (!init_failed && !yaffs2_scan_backwards(dev))
4867 init_failed = 1;
4868 }
4869 } else if (!yaffs1_scan(dev)) {
4870 init_failed = 1;
4871 }
4872
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);
4877 }
4878
4879 if (init_failed) {
4880
4881 yaffs_trace(YAFFS_TRACE_TRACING,
4882 "yaffs: yaffs_guts_initialise() aborted.");
4883
4884 yaffs_deinitialise(dev);
4885 return YAFFS_FAIL;
4886 }
4887
4888
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;
4894
4895 dev->n_retired_blocks = 0;
4896
4897 yaffs_verify_free_chunks(dev);
4898 yaffs_verify_blocks(dev);
4899
4900
4901 if (!dev->is_checkpointed && dev->blocks_in_checkpt > 0)
4902 yaffs2_checkpt_invalidate(dev);
4903
4904 yaffs_trace(YAFFS_TRACE_TRACING,
4905 "yaffs: yaffs_guts_initialise() done.");
4906 return YAFFS_OK;
4907}
4908
4909void yaffs_deinitialise(struct yaffs_dev *dev)
4910{
4911 if (dev->is_mounted) {
4912 int i;
4913
4914 yaffs_deinit_blocks(dev);
4915 yaffs_deinit_tnodes_and_objs(dev);
4916 yaffs_summary_deinit(dev);
4917
4918 if (dev->param.n_caches > 0 && dev->cache) {
4919
4920 for (i = 0; i < dev->param.n_caches; i++) {
4921 kfree(dev->cache[i].data);
4922 dev->cache[i].data = NULL;
4923 }
4924
4925 kfree(dev->cache);
4926 dev->cache = NULL;
4927 }
4928
4929 kfree(dev->gc_cleanup_list);
4930
4931 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
4932 kfree(dev->temp_buffer[i].buffer);
4933
4934 dev->is_mounted = 0;
4935
4936 if (dev->param.deinitialise_flash_fn)
4937 dev->param.deinitialise_flash_fn(dev);
4938 }
4939}
4940
4941int yaffs_count_free_chunks(struct yaffs_dev *dev)
4942{
4943 int n_free = 0;
4944 int b;
4945 struct yaffs_block_info *blk;
4946
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:
4954 n_free +=
4955 (dev->param.chunks_per_block - blk->pages_in_use +
4956 blk->soft_del_pages);
4957 break;
4958 default:
4959 break;
4960 }
4961 blk++;
4962 }
4963 return n_free;
4964}
4965
4966int yaffs_get_n_free_chunks(struct yaffs_dev *dev)
4967{
4968
4969 int n_free;
4970 int n_dirty_caches;
4971 int blocks_for_checkpt;
4972 int i;
4973
4974 n_free = dev->n_free_chunks;
4975 n_free += dev->n_deleted_files;
4976
4977
4978
4979 for (n_dirty_caches = 0, i = 0; i < dev->param.n_caches; i++) {
4980 if (dev->cache[i].dirty)
4981 n_dirty_caches++;
4982 }
4983
4984 n_free -= n_dirty_caches;
4985
4986 n_free -=
4987 ((dev->param.n_reserved_blocks + 1) * dev->param.chunks_per_block);
4988
4989
4990 blocks_for_checkpt = yaffs_calc_checkpt_blocks_required(dev);
4991
4992 n_free -= (blocks_for_checkpt * dev->param.chunks_per_block);
4993
4994 if (n_free < 0)
4995 n_free = 0;
4996
4997 return n_free;
4998}
4999
5000
5001
5002
5003
5004void yaffs_oh_size_load(struct yaffs_obj_hdr *oh, loff_t fsize)
5005{
5006 oh->file_size_low = (fsize & 0xFFFFFFFF);
5007 oh->file_size_high = ((fsize >> 32) & 0xFFFFFFFF);
5008}
5009
5010loff_t yaffs_oh_to_size(struct yaffs_obj_hdr *oh)
5011{
5012 loff_t retval;
5013
5014 if (~(oh->file_size_high))
5015 retval = (((loff_t) oh->file_size_high) << 32) |
5016 (((loff_t) oh->file_size_low) & 0xFFFFFFFF);
5017 else
5018 retval = (loff_t) oh->file_size_low;
5019
5020 return retval;
5021}
5022