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generic: fold yaffs_git_2010_10_20 patch to generic/files
[openwrt/openwrt.git] / target / linux / generic / files / fs / yaffs2 / yaffs_guts.c
1 /*
2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
3 *
4 * Copyright (C) 2002-2010 Aleph One Ltd.
5 * for Toby Churchill Ltd and Brightstar Engineering
6 *
7 * Created by Charles Manning <charles@aleph1.co.uk>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13 #include "yportenv.h"
14 #include "yaffs_trace.h"
15
16 #include "yaffsinterface.h"
17 #include "yaffs_guts.h"
18 #include "yaffs_tagsvalidity.h"
19 #include "yaffs_getblockinfo.h"
20
21 #include "yaffs_tagscompat.h"
22
23 #include "yaffs_nand.h"
24
25 #include "yaffs_yaffs1.h"
26 #include "yaffs_yaffs2.h"
27 #include "yaffs_bitmap.h"
28 #include "yaffs_verify.h"
29
30 #include "yaffs_nand.h"
31 #include "yaffs_packedtags2.h"
32
33 #include "yaffs_nameval.h"
34 #include "yaffs_allocator.h"
35
36 /* Note YAFFS_GC_GOOD_ENOUGH must be <= YAFFS_GC_PASSIVE_THRESHOLD */
37 #define YAFFS_GC_GOOD_ENOUGH 2
38 #define YAFFS_GC_PASSIVE_THRESHOLD 4
39
40 #include "yaffs_ecc.h"
41
42
43
44 /* Robustification (if it ever comes about...) */
45 static void yaffs_retire_block(yaffs_dev_t *dev, int flash_block);
46 static void yaffs_handle_chunk_wr_error(yaffs_dev_t *dev, int nand_chunk,
47 int erasedOk);
48 static void yaffs_handle_chunk_wr_ok(yaffs_dev_t *dev, int nand_chunk,
49 const __u8 *data,
50 const yaffs_ext_tags *tags);
51 static void yaffs_handle_chunk_update(yaffs_dev_t *dev, int nand_chunk,
52 const yaffs_ext_tags *tags);
53
54 /* Other local prototypes */
55 static void yaffs_update_parent(yaffs_obj_t *obj);
56 static int yaffs_unlink_obj(yaffs_obj_t *obj);
57 static int yaffs_obj_cache_dirty(yaffs_obj_t *obj);
58
59 static int yaffs_write_new_chunk(yaffs_dev_t *dev,
60 const __u8 *buffer,
61 yaffs_ext_tags *tags,
62 int useReserve);
63
64
65 static yaffs_obj_t *yaffs_new_obj(yaffs_dev_t *dev, int number,
66 yaffs_obj_type type);
67
68
69 static int yaffs_apply_xattrib_mod(yaffs_obj_t *obj, char *buffer, yaffs_xattr_mod *xmod);
70
71 static void yaffs_remove_obj_from_dir(yaffs_obj_t *obj);
72 static int yaffs_check_structures(void);
73 static int yaffs_generic_obj_del(yaffs_obj_t *in);
74
75 static int yaffs_check_chunk_erased(struct yaffs_dev_s *dev,
76 int nand_chunk);
77
78 static int yaffs_unlink_worker(yaffs_obj_t *obj);
79
80 static int yaffs_tags_match(const yaffs_ext_tags *tags, int obj_id,
81 int chunkInObject);
82
83 static int yaffs_alloc_chunk(yaffs_dev_t *dev, int useReserve,
84 yaffs_block_info_t **blockUsedPtr);
85
86 static void yaffs_check_obj_details_loaded(yaffs_obj_t *in);
87
88 static void yaffs_invalidate_whole_cache(yaffs_obj_t *in);
89 static void yaffs_invalidate_chunk_cache(yaffs_obj_t *object, int chunk_id);
90
91 static int yaffs_find_chunk_in_file(yaffs_obj_t *in, int inode_chunk,
92 yaffs_ext_tags *tags);
93
94 static int yaffs_verify_chunk_written(yaffs_dev_t *dev,
95 int nand_chunk,
96 const __u8 *data,
97 yaffs_ext_tags *tags);
98
99
100 static void yaffs_load_name_from_oh(yaffs_dev_t *dev,YCHAR *name, const YCHAR *ohName, int bufferSize);
101 static void yaffs_load_oh_from_name(yaffs_dev_t *dev,YCHAR *ohName, const YCHAR *name);
102
103
104 /* Function to calculate chunk and offset */
105
106 static void yaffs_addr_to_chunk(yaffs_dev_t *dev, loff_t addr, int *chunkOut,
107 __u32 *offsetOut)
108 {
109 int chunk;
110 __u32 offset;
111
112 chunk = (__u32)(addr >> dev->chunk_shift);
113
114 if (dev->chunk_div == 1) {
115 /* easy power of 2 case */
116 offset = (__u32)(addr & dev->chunk_mask);
117 } else {
118 /* Non power-of-2 case */
119
120 loff_t chunkBase;
121
122 chunk /= dev->chunk_div;
123
124 chunkBase = ((loff_t)chunk) * dev->data_bytes_per_chunk;
125 offset = (__u32)(addr - chunkBase);
126 }
127
128 *chunkOut = chunk;
129 *offsetOut = offset;
130 }
131
132 /* Function to return the number of shifts for a power of 2 greater than or
133 * equal to the given number
134 * Note we don't try to cater for all possible numbers and this does not have to
135 * be hellishly efficient.
136 */
137
138 static __u32 ShiftsGE(__u32 x)
139 {
140 int extraBits;
141 int nShifts;
142
143 nShifts = extraBits = 0;
144
145 while (x > 1) {
146 if (x & 1)
147 extraBits++;
148 x >>= 1;
149 nShifts++;
150 }
151
152 if (extraBits)
153 nShifts++;
154
155 return nShifts;
156 }
157
158 /* Function to return the number of shifts to get a 1 in bit 0
159 */
160
161 static __u32 Shifts(__u32 x)
162 {
163 __u32 nShifts;
164
165 nShifts = 0;
166
167 if (!x)
168 return 0;
169
170 while (!(x&1)) {
171 x >>= 1;
172 nShifts++;
173 }
174
175 return nShifts;
176 }
177
178
179
180 /*
181 * Temporary buffer manipulations.
182 */
183
184 static int yaffs_init_tmp_buffers(yaffs_dev_t *dev)
185 {
186 int i;
187 __u8 *buf = (__u8 *)1;
188
189 memset(dev->temp_buffer, 0, sizeof(dev->temp_buffer));
190
191 for (i = 0; buf && i < YAFFS_N_TEMP_BUFFERS; i++) {
192 dev->temp_buffer[i].line = 0; /* not in use */
193 dev->temp_buffer[i].buffer = buf =
194 YMALLOC_DMA(dev->param.total_bytes_per_chunk);
195 }
196
197 return buf ? YAFFS_OK : YAFFS_FAIL;
198 }
199
200 __u8 *yaffs_get_temp_buffer(yaffs_dev_t *dev, int line_no)
201 {
202 int i, j;
203
204 dev->temp_in_use++;
205 if (dev->temp_in_use > dev->max_temp)
206 dev->max_temp = dev->temp_in_use;
207
208 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
209 if (dev->temp_buffer[i].line == 0) {
210 dev->temp_buffer[i].line = line_no;
211 if ((i + 1) > dev->max_temp) {
212 dev->max_temp = i + 1;
213 for (j = 0; j <= i; j++)
214 dev->temp_buffer[j].max_line =
215 dev->temp_buffer[j].line;
216 }
217
218 return dev->temp_buffer[i].buffer;
219 }
220 }
221
222 T(YAFFS_TRACE_BUFFERS,
223 (TSTR("Out of temp buffers at line %d, other held by lines:"),
224 line_no));
225 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
226 T(YAFFS_TRACE_BUFFERS, (TSTR(" %d "), dev->temp_buffer[i].line));
227
228 T(YAFFS_TRACE_BUFFERS, (TSTR(" " TENDSTR)));
229
230 /*
231 * If we got here then we have to allocate an unmanaged one
232 * This is not good.
233 */
234
235 dev->unmanaged_buffer_allocs++;
236 return YMALLOC(dev->data_bytes_per_chunk);
237
238 }
239
240 void yaffs_release_temp_buffer(yaffs_dev_t *dev, __u8 *buffer,
241 int line_no)
242 {
243 int i;
244
245 dev->temp_in_use--;
246
247 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
248 if (dev->temp_buffer[i].buffer == buffer) {
249 dev->temp_buffer[i].line = 0;
250 return;
251 }
252 }
253
254 if (buffer) {
255 /* assume it is an unmanaged one. */
256 T(YAFFS_TRACE_BUFFERS,
257 (TSTR("Releasing unmanaged temp buffer in line %d" TENDSTR),
258 line_no));
259 YFREE(buffer);
260 dev->unmanaged_buffer_deallocs++;
261 }
262
263 }
264
265 /*
266 * Determine if we have a managed buffer.
267 */
268 int yaffs_is_managed_tmp_buffer(yaffs_dev_t *dev, const __u8 *buffer)
269 {
270 int i;
271
272 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
273 if (dev->temp_buffer[i].buffer == buffer)
274 return 1;
275 }
276
277 for (i = 0; i < dev->param.n_caches; i++) {
278 if (dev->cache[i].data == buffer)
279 return 1;
280 }
281
282 if (buffer == dev->checkpt_buffer)
283 return 1;
284
285 T(YAFFS_TRACE_ALWAYS,
286 (TSTR("yaffs: unmaged buffer detected.\n" TENDSTR)));
287 return 0;
288 }
289
290 /*
291 * Verification code
292 */
293
294
295
296
297 /*
298 * Simple hash function. Needs to have a reasonable spread
299 */
300
301 static Y_INLINE int yaffs_hash_fn(int n)
302 {
303 n = abs(n);
304 return n % YAFFS_NOBJECT_BUCKETS;
305 }
306
307 /*
308 * Access functions to useful fake objects.
309 * Note that root might have a presence in NAND if permissions are set.
310 */
311
312 yaffs_obj_t *yaffs_root(yaffs_dev_t *dev)
313 {
314 return dev->root_dir;
315 }
316
317 yaffs_obj_t *yaffs_lost_n_found(yaffs_dev_t *dev)
318 {
319 return dev->lost_n_found;
320 }
321
322
323 /*
324 * Erased NAND checking functions
325 */
326
327 int yaffs_check_ff(__u8 *buffer, int n_bytes)
328 {
329 /* Horrible, slow implementation */
330 while (n_bytes--) {
331 if (*buffer != 0xFF)
332 return 0;
333 buffer++;
334 }
335 return 1;
336 }
337
338 static int yaffs_check_chunk_erased(struct yaffs_dev_s *dev,
339 int nand_chunk)
340 {
341 int retval = YAFFS_OK;
342 __u8 *data = yaffs_get_temp_buffer(dev, __LINE__);
343 yaffs_ext_tags tags;
344 int result;
345
346 result = yaffs_rd_chunk_tags_nand(dev, nand_chunk, data, &tags);
347
348 if (tags.ecc_result > YAFFS_ECC_RESULT_NO_ERROR)
349 retval = YAFFS_FAIL;
350
351 if (!yaffs_check_ff(data, dev->data_bytes_per_chunk) || tags.chunk_used) {
352 T(YAFFS_TRACE_NANDACCESS,
353 (TSTR("Chunk %d not erased" TENDSTR), nand_chunk));
354 retval = YAFFS_FAIL;
355 }
356
357 yaffs_release_temp_buffer(dev, data, __LINE__);
358
359 return retval;
360
361 }
362
363
364 static int yaffs_verify_chunk_written(yaffs_dev_t *dev,
365 int nand_chunk,
366 const __u8 *data,
367 yaffs_ext_tags *tags)
368 {
369 int retval = YAFFS_OK;
370 yaffs_ext_tags tempTags;
371 __u8 *buffer = yaffs_get_temp_buffer(dev,__LINE__);
372 int result;
373
374 result = yaffs_rd_chunk_tags_nand(dev,nand_chunk,buffer,&tempTags);
375 if(memcmp(buffer,data,dev->data_bytes_per_chunk) ||
376 tempTags.obj_id != tags->obj_id ||
377 tempTags.chunk_id != tags->chunk_id ||
378 tempTags.n_bytes != tags->n_bytes)
379 retval = YAFFS_FAIL;
380
381 yaffs_release_temp_buffer(dev, buffer, __LINE__);
382
383 return retval;
384 }
385
386 static int yaffs_write_new_chunk(struct yaffs_dev_s *dev,
387 const __u8 *data,
388 yaffs_ext_tags *tags,
389 int useReserve)
390 {
391 int attempts = 0;
392 int writeOk = 0;
393 int chunk;
394
395 yaffs2_checkpt_invalidate(dev);
396
397 do {
398 yaffs_block_info_t *bi = 0;
399 int erasedOk = 0;
400
401 chunk = yaffs_alloc_chunk(dev, useReserve, &bi);
402 if (chunk < 0) {
403 /* no space */
404 break;
405 }
406
407 /* First check this chunk is erased, if it needs
408 * checking. The checking policy (unless forced
409 * always on) is as follows:
410 *
411 * Check the first page we try to write in a block.
412 * If the check passes then we don't need to check any
413 * more. If the check fails, we check again...
414 * If the block has been erased, we don't need to check.
415 *
416 * However, if the block has been prioritised for gc,
417 * then we think there might be something odd about
418 * this block and stop using it.
419 *
420 * Rationale: We should only ever see chunks that have
421 * not been erased if there was a partially written
422 * chunk due to power loss. This checking policy should
423 * catch that case with very few checks and thus save a
424 * lot of checks that are most likely not needed.
425 *
426 * Mods to the above
427 * If an erase check fails or the write fails we skip the
428 * rest of the block.
429 */
430
431 /* let's give it a try */
432 attempts++;
433
434 if(dev->param.always_check_erased)
435 bi->skip_erased_check = 0;
436
437 if (!bi->skip_erased_check) {
438 erasedOk = yaffs_check_chunk_erased(dev, chunk);
439 if (erasedOk != YAFFS_OK) {
440 T(YAFFS_TRACE_ERROR,
441 (TSTR("**>> yaffs chunk %d was not erased"
442 TENDSTR), chunk));
443
444 /* If not erased, delete this one,
445 * skip rest of block and
446 * try another chunk */
447 yaffs_chunk_del(dev,chunk,1,__LINE__);
448 yaffs_skip_rest_of_block(dev);
449 continue;
450 }
451 }
452
453 writeOk = yaffs_wr_chunk_tags_nand(dev, chunk,
454 data, tags);
455
456 if(!bi->skip_erased_check)
457 writeOk = yaffs_verify_chunk_written(dev, chunk, data, tags);
458
459 if (writeOk != YAFFS_OK) {
460 /* Clean up aborted write, skip to next block and
461 * try another chunk */
462 yaffs_handle_chunk_wr_error(dev, chunk, erasedOk);
463 continue;
464 }
465
466 bi->skip_erased_check = 1;
467
468 /* Copy the data into the robustification buffer */
469 yaffs_handle_chunk_wr_ok(dev, chunk, data, tags);
470
471 } while (writeOk != YAFFS_OK &&
472 (yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts));
473
474 if (!writeOk)
475 chunk = -1;
476
477 if (attempts > 1) {
478 T(YAFFS_TRACE_ERROR,
479 (TSTR("**>> yaffs write required %d attempts" TENDSTR),
480 attempts));
481
482 dev->n_retired_writes += (attempts - 1);
483 }
484
485 return chunk;
486 }
487
488
489
490 /*
491 * Block retiring for handling a broken block.
492 */
493
494 static void yaffs_retire_block(yaffs_dev_t *dev, int flash_block)
495 {
496 yaffs_block_info_t *bi = yaffs_get_block_info(dev, flash_block);
497
498 yaffs2_checkpt_invalidate(dev);
499
500 yaffs2_clear_oldest_dirty_seq(dev,bi);
501
502 if (yaffs_mark_bad(dev, flash_block) != YAFFS_OK) {
503 if (yaffs_erase_block(dev, flash_block) != YAFFS_OK) {
504 T(YAFFS_TRACE_ALWAYS, (TSTR(
505 "yaffs: Failed to mark bad and erase block %d"
506 TENDSTR), flash_block));
507 } else {
508 yaffs_ext_tags tags;
509 int chunk_id = flash_block * dev->param.chunks_per_block;
510
511 __u8 *buffer = yaffs_get_temp_buffer(dev, __LINE__);
512
513 memset(buffer, 0xff, dev->data_bytes_per_chunk);
514 yaffs_init_tags(&tags);
515 tags.seq_number = YAFFS_SEQUENCE_BAD_BLOCK;
516 if (dev->param.write_chunk_tags_fn(dev, chunk_id -
517 dev->chunk_offset, buffer, &tags) != YAFFS_OK)
518 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Failed to "
519 TCONT("write bad block marker to block %d")
520 TENDSTR), flash_block));
521
522 yaffs_release_temp_buffer(dev, buffer, __LINE__);
523 }
524 }
525
526 bi->block_state = YAFFS_BLOCK_STATE_DEAD;
527 bi->gc_prioritise = 0;
528 bi->needs_retiring = 0;
529
530 dev->n_retired_blocks++;
531 }
532
533 /*
534 * Functions for robustisizing TODO
535 *
536 */
537
538 static void yaffs_handle_chunk_wr_ok(yaffs_dev_t *dev, int nand_chunk,
539 const __u8 *data,
540 const yaffs_ext_tags *tags)
541 {
542 dev=dev;
543 nand_chunk=nand_chunk;
544 data=data;
545 tags=tags;
546 }
547
548 static void yaffs_handle_chunk_update(yaffs_dev_t *dev, int nand_chunk,
549 const yaffs_ext_tags *tags)
550 {
551 dev=dev;
552 nand_chunk=nand_chunk;
553 tags=tags;
554 }
555
556 void yaffs_handle_chunk_error(yaffs_dev_t *dev, yaffs_block_info_t *bi)
557 {
558 if (!bi->gc_prioritise) {
559 bi->gc_prioritise = 1;
560 dev->has_pending_prioritised_gc = 1;
561 bi->chunk_error_strikes++;
562
563 if (bi->chunk_error_strikes > 3) {
564 bi->needs_retiring = 1; /* Too many stikes, so retire this */
565 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Block struck out" TENDSTR)));
566
567 }
568 }
569 }
570
571 static void yaffs_handle_chunk_wr_error(yaffs_dev_t *dev, int nand_chunk,
572 int erasedOk)
573 {
574 int flash_block = nand_chunk / dev->param.chunks_per_block;
575 yaffs_block_info_t *bi = yaffs_get_block_info(dev, flash_block);
576
577 yaffs_handle_chunk_error(dev, bi);
578
579 if (erasedOk) {
580 /* Was an actual write failure, so mark the block for retirement */
581 bi->needs_retiring = 1;
582 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
583 (TSTR("**>> Block %d needs retiring" TENDSTR), flash_block));
584 }
585
586 /* Delete the chunk */
587 yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
588 yaffs_skip_rest_of_block(dev);
589 }
590
591
592 /*---------------- Name handling functions ------------*/
593
594 static __u16 yaffs_calc_name_sum(const YCHAR *name)
595 {
596 __u16 sum = 0;
597 __u16 i = 1;
598
599 const YUCHAR *bname = (const YUCHAR *) name;
600 if (bname) {
601 while ((*bname) && (i < (YAFFS_MAX_NAME_LENGTH/2))) {
602
603 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
604 sum += yaffs_toupper(*bname) * i;
605 #else
606 sum += (*bname) * i;
607 #endif
608 i++;
609 bname++;
610 }
611 }
612 return sum;
613 }
614
615 void yaffs_set_obj_name(yaffs_obj_t *obj, const YCHAR *name)
616 {
617 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
618 memset(obj->short_name, 0, sizeof(YCHAR) * (YAFFS_SHORT_NAME_LENGTH+1));
619 if (name && yaffs_strnlen(name,YAFFS_SHORT_NAME_LENGTH+1) <= YAFFS_SHORT_NAME_LENGTH)
620 yaffs_strcpy(obj->short_name, name);
621 else
622 obj->short_name[0] = _Y('\0');
623 #endif
624 obj->sum = yaffs_calc_name_sum(name);
625 }
626
627 void yaffs_set_obj_name_from_oh(yaffs_obj_t *obj, const yaffs_obj_header *oh)
628 {
629 #ifdef CONFIG_YAFFS_AUTO_UNICODE
630 YCHAR tmpName[YAFFS_MAX_NAME_LENGTH+1];
631 memset(tmpName,0,sizeof(tmpName));
632 yaffs_load_name_from_oh(obj->my_dev,tmpName,oh->name,YAFFS_MAX_NAME_LENGTH+1);
633 yaffs_set_obj_name(obj,tmpName);
634 #else
635 yaffs_set_obj_name(obj,oh->name);
636 #endif
637 }
638
639 /*-------------------- TNODES -------------------
640
641 * List of spare tnodes
642 * The list is hooked together using the first pointer
643 * in the tnode.
644 */
645
646
647 yaffs_tnode_t *yaffs_get_tnode(yaffs_dev_t *dev)
648 {
649 yaffs_tnode_t *tn = yaffs_alloc_raw_tnode(dev);
650 if (tn){
651 memset(tn, 0, dev->tnode_size);
652 dev->n_tnodes++;
653 }
654
655 dev->checkpoint_blocks_required = 0; /* force recalculation*/
656
657 return tn;
658 }
659
660 /* FreeTnode frees up a tnode and puts it back on the free list */
661 static void yaffs_free_tnode(yaffs_dev_t *dev, yaffs_tnode_t *tn)
662 {
663 yaffs_free_raw_tnode(dev,tn);
664 dev->n_tnodes--;
665 dev->checkpoint_blocks_required = 0; /* force recalculation*/
666 }
667
668 static void yaffs_deinit_tnodes_and_objs(yaffs_dev_t *dev)
669 {
670 yaffs_deinit_raw_tnodes_and_objs(dev);
671 dev->n_obj = 0;
672 dev->n_tnodes = 0;
673 }
674
675
676 void yaffs_load_tnode_0(yaffs_dev_t *dev, yaffs_tnode_t *tn, unsigned pos,
677 unsigned val)
678 {
679 __u32 *map = (__u32 *)tn;
680 __u32 bitInMap;
681 __u32 bitInWord;
682 __u32 wordInMap;
683 __u32 mask;
684
685 pos &= YAFFS_TNODES_LEVEL0_MASK;
686 val >>= dev->chunk_grp_bits;
687
688 bitInMap = pos * dev->tnode_width;
689 wordInMap = bitInMap / 32;
690 bitInWord = bitInMap & (32 - 1);
691
692 mask = dev->tnode_mask << bitInWord;
693
694 map[wordInMap] &= ~mask;
695 map[wordInMap] |= (mask & (val << bitInWord));
696
697 if (dev->tnode_width > (32 - bitInWord)) {
698 bitInWord = (32 - bitInWord);
699 wordInMap++;;
700 mask = dev->tnode_mask >> (/*dev->tnode_width -*/ bitInWord);
701 map[wordInMap] &= ~mask;
702 map[wordInMap] |= (mask & (val >> bitInWord));
703 }
704 }
705
706 __u32 yaffs_get_group_base(yaffs_dev_t *dev, yaffs_tnode_t *tn,
707 unsigned pos)
708 {
709 __u32 *map = (__u32 *)tn;
710 __u32 bitInMap;
711 __u32 bitInWord;
712 __u32 wordInMap;
713 __u32 val;
714
715 pos &= YAFFS_TNODES_LEVEL0_MASK;
716
717 bitInMap = pos * dev->tnode_width;
718 wordInMap = bitInMap / 32;
719 bitInWord = bitInMap & (32 - 1);
720
721 val = map[wordInMap] >> bitInWord;
722
723 if (dev->tnode_width > (32 - bitInWord)) {
724 bitInWord = (32 - bitInWord);
725 wordInMap++;;
726 val |= (map[wordInMap] << bitInWord);
727 }
728
729 val &= dev->tnode_mask;
730 val <<= dev->chunk_grp_bits;
731
732 return val;
733 }
734
735 /* ------------------- End of individual tnode manipulation -----------------*/
736
737 /* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
738 * The look up tree is represented by the top tnode and the number of top_level
739 * in the tree. 0 means only the level 0 tnode is in the tree.
740 */
741
742 /* FindLevel0Tnode finds the level 0 tnode, if one exists. */
743 yaffs_tnode_t *yaffs_find_tnode_0(yaffs_dev_t *dev,
744 yaffs_file_s *file_struct,
745 __u32 chunk_id)
746 {
747 yaffs_tnode_t *tn = file_struct->top;
748 __u32 i;
749 int requiredTallness;
750 int level = file_struct->top_level;
751
752 dev=dev;
753
754 /* Check sane level and chunk Id */
755 if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL)
756 return NULL;
757
758 if (chunk_id > YAFFS_MAX_CHUNK_ID)
759 return NULL;
760
761 /* First check we're tall enough (ie enough top_level) */
762
763 i = chunk_id >> YAFFS_TNODES_LEVEL0_BITS;
764 requiredTallness = 0;
765 while (i) {
766 i >>= YAFFS_TNODES_INTERNAL_BITS;
767 requiredTallness++;
768 }
769
770 if (requiredTallness > file_struct->top_level)
771 return NULL; /* Not tall enough, so we can't find it */
772
773 /* Traverse down to level 0 */
774 while (level > 0 && tn) {
775 tn = tn->internal[(chunk_id >>
776 (YAFFS_TNODES_LEVEL0_BITS +
777 (level - 1) *
778 YAFFS_TNODES_INTERNAL_BITS)) &
779 YAFFS_TNODES_INTERNAL_MASK];
780 level--;
781 }
782
783 return tn;
784 }
785
786 /* AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.
787 * This happens in two steps:
788 * 1. If the tree isn't tall enough, then make it taller.
789 * 2. Scan down the tree towards the level 0 tnode adding tnodes if required.
790 *
791 * Used when modifying the tree.
792 *
793 * If the tn argument is NULL, then a fresh tnode will be added otherwise the specified tn will
794 * be plugged into the ttree.
795 */
796
797 yaffs_tnode_t *yaffs_add_find_tnode_0(yaffs_dev_t *dev,
798 yaffs_file_s *file_struct,
799 __u32 chunk_id,
800 yaffs_tnode_t *passed_tn)
801 {
802 int requiredTallness;
803 int i;
804 int l;
805 yaffs_tnode_t *tn;
806
807 __u32 x;
808
809
810 /* Check sane level and page Id */
811 if (file_struct->top_level < 0 || file_struct->top_level > YAFFS_TNODES_MAX_LEVEL)
812 return NULL;
813
814 if (chunk_id > YAFFS_MAX_CHUNK_ID)
815 return NULL;
816
817 /* First check we're tall enough (ie enough top_level) */
818
819 x = chunk_id >> YAFFS_TNODES_LEVEL0_BITS;
820 requiredTallness = 0;
821 while (x) {
822 x >>= YAFFS_TNODES_INTERNAL_BITS;
823 requiredTallness++;
824 }
825
826
827 if (requiredTallness > file_struct->top_level) {
828 /* Not tall enough, gotta make the tree taller */
829 for (i = file_struct->top_level; i < requiredTallness; i++) {
830
831 tn = yaffs_get_tnode(dev);
832
833 if (tn) {
834 tn->internal[0] = file_struct->top;
835 file_struct->top = tn;
836 file_struct->top_level++;
837 } else {
838 T(YAFFS_TRACE_ERROR,
839 (TSTR("yaffs: no more tnodes" TENDSTR)));
840 return NULL;
841 }
842 }
843 }
844
845 /* Traverse down to level 0, adding anything we need */
846
847 l = file_struct->top_level;
848 tn = file_struct->top;
849
850 if (l > 0) {
851 while (l > 0 && tn) {
852 x = (chunk_id >>
853 (YAFFS_TNODES_LEVEL0_BITS +
854 (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
855 YAFFS_TNODES_INTERNAL_MASK;
856
857
858 if ((l > 1) && !tn->internal[x]) {
859 /* Add missing non-level-zero tnode */
860 tn->internal[x] = yaffs_get_tnode(dev);
861 if(!tn->internal[x])
862 return NULL;
863 } else if (l == 1) {
864 /* Looking from level 1 at level 0 */
865 if (passed_tn) {
866 /* If we already have one, then release it.*/
867 if (tn->internal[x])
868 yaffs_free_tnode(dev, tn->internal[x]);
869 tn->internal[x] = passed_tn;
870
871 } else if (!tn->internal[x]) {
872 /* Don't have one, none passed in */
873 tn->internal[x] = yaffs_get_tnode(dev);
874 if(!tn->internal[x])
875 return NULL;
876 }
877 }
878
879 tn = tn->internal[x];
880 l--;
881 }
882 } else {
883 /* top is level 0 */
884 if (passed_tn) {
885 memcpy(tn, passed_tn, (dev->tnode_width * YAFFS_NTNODES_LEVEL0)/8);
886 yaffs_free_tnode(dev, passed_tn);
887 }
888 }
889
890 return tn;
891 }
892
893 static int yaffs_find_chunk_in_group(yaffs_dev_t *dev, int theChunk,
894 yaffs_ext_tags *tags, int obj_id,
895 int inode_chunk)
896 {
897 int j;
898
899 for (j = 0; theChunk && j < dev->chunk_grp_size; j++) {
900 if (yaffs_check_chunk_bit(dev, theChunk / dev->param.chunks_per_block,
901 theChunk % dev->param.chunks_per_block)) {
902
903 if(dev->chunk_grp_size == 1)
904 return theChunk;
905 else {
906 yaffs_rd_chunk_tags_nand(dev, theChunk, NULL,
907 tags);
908 if (yaffs_tags_match(tags, obj_id, inode_chunk)) {
909 /* found it; */
910 return theChunk;
911 }
912 }
913 }
914 theChunk++;
915 }
916 return -1;
917 }
918
919 #if 0
920 /* Experimental code not being used yet. Might speed up file deletion */
921 /* DeleteWorker scans backwards through the tnode tree and deletes all the
922 * chunks and tnodes in the file.
923 * Returns 1 if the tree was deleted.
924 * Returns 0 if it stopped early due to hitting the limit and the delete is incomplete.
925 */
926
927 static int yaffs_del_worker(yaffs_obj_t *in, yaffs_tnode_t *tn, __u32 level,
928 int chunk_offset, int *limit)
929 {
930 int i;
931 int inode_chunk;
932 int theChunk;
933 yaffs_ext_tags tags;
934 int foundChunk;
935 yaffs_dev_t *dev = in->my_dev;
936
937 int allDone = 1;
938
939 if (tn) {
940 if (level > 0) {
941 for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
942 i--) {
943 if (tn->internal[i]) {
944 if (limit && (*limit) < 0) {
945 allDone = 0;
946 } else {
947 allDone =
948 yaffs_del_worker(in,
949 tn->
950 internal
951 [i],
952 level -
953 1,
954 (chunk_offset
955 <<
956 YAFFS_TNODES_INTERNAL_BITS)
957 + i,
958 limit);
959 }
960 if (allDone) {
961 yaffs_free_tnode(dev,
962 tn->
963 internal[i]);
964 tn->internal[i] = NULL;
965 }
966 }
967 }
968 return (allDone) ? 1 : 0;
969 } else if (level == 0) {
970 int hitLimit = 0;
971
972 for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0 && !hitLimit;
973 i--) {
974 theChunk = yaffs_get_group_base(dev, tn, i);
975 if (theChunk) {
976
977 inode_chunk = (chunk_offset <<
978 YAFFS_TNODES_LEVEL0_BITS) + i;
979
980 foundChunk =
981 yaffs_find_chunk_in_group(dev,
982 theChunk,
983 &tags,
984 in->obj_id,
985 inode_chunk);
986
987 if (foundChunk > 0) {
988 yaffs_chunk_del(dev,
989 foundChunk, 1,
990 __LINE__);
991 in->n_data_chunks--;
992 if (limit) {
993 *limit = *limit - 1;
994 if (*limit <= 0)
995 hitLimit = 1;
996 }
997
998 }
999
1000 yaffs_load_tnode_0(dev, tn, i, 0);
1001 }
1002
1003 }
1004 return (i < 0) ? 1 : 0;
1005
1006 }
1007
1008 }
1009
1010 return 1;
1011
1012 }
1013
1014 #endif
1015
1016 static void yaffs_soft_del_chunk(yaffs_dev_t *dev, int chunk)
1017 {
1018 yaffs_block_info_t *theBlock;
1019 unsigned block_no;
1020
1021 T(YAFFS_TRACE_DELETION, (TSTR("soft delete chunk %d" TENDSTR), chunk));
1022
1023 block_no = chunk / dev->param.chunks_per_block;
1024 theBlock = yaffs_get_block_info(dev, block_no);
1025 if (theBlock) {
1026 theBlock->soft_del_pages++;
1027 dev->n_free_chunks++;
1028 yaffs2_update_oldest_dirty_seq(dev, block_no, theBlock);
1029 }
1030 }
1031
1032 /* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
1033 * All soft deleting does is increment the block's softdelete count and pulls the chunk out
1034 * of the tnode.
1035 * Thus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
1036 */
1037
1038 static int yaffs_soft_del_worker(yaffs_obj_t *in, yaffs_tnode_t *tn,
1039 __u32 level, int chunk_offset)
1040 {
1041 int i;
1042 int theChunk;
1043 int allDone = 1;
1044 yaffs_dev_t *dev = in->my_dev;
1045
1046 if (tn) {
1047 if (level > 0) {
1048
1049 for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
1050 i--) {
1051 if (tn->internal[i]) {
1052 allDone =
1053 yaffs_soft_del_worker(in,
1054 tn->
1055 internal[i],
1056 level - 1,
1057 (chunk_offset
1058 <<
1059 YAFFS_TNODES_INTERNAL_BITS)
1060 + i);
1061 if (allDone) {
1062 yaffs_free_tnode(dev,
1063 tn->
1064 internal[i]);
1065 tn->internal[i] = NULL;
1066 } else {
1067 /* Hoosterman... how could this happen? */
1068 }
1069 }
1070 }
1071 return (allDone) ? 1 : 0;
1072 } else if (level == 0) {
1073
1074 for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
1075 theChunk = yaffs_get_group_base(dev, tn, i);
1076 if (theChunk) {
1077 /* Note this does not find the real chunk, only the chunk group.
1078 * We make an assumption that a chunk group is not larger than
1079 * a block.
1080 */
1081 yaffs_soft_del_chunk(dev, theChunk);
1082 yaffs_load_tnode_0(dev, tn, i, 0);
1083 }
1084
1085 }
1086 return 1;
1087
1088 }
1089
1090 }
1091
1092 return 1;
1093
1094 }
1095
1096 static void yaffs_soft_del_file(yaffs_obj_t *obj)
1097 {
1098 if (obj->deleted &&
1099 obj->variant_type == YAFFS_OBJECT_TYPE_FILE && !obj->soft_del) {
1100 if (obj->n_data_chunks <= 0) {
1101 /* Empty file with no duplicate object headers, just delete it immediately */
1102 yaffs_free_tnode(obj->my_dev,
1103 obj->variant.file_variant.top);
1104 obj->variant.file_variant.top = NULL;
1105 T(YAFFS_TRACE_TRACING,
1106 (TSTR("yaffs: Deleting empty file %d" TENDSTR),
1107 obj->obj_id));
1108 yaffs_generic_obj_del(obj);
1109 } else {
1110 yaffs_soft_del_worker(obj,
1111 obj->variant.file_variant.top,
1112 obj->variant.file_variant.
1113 top_level, 0);
1114 obj->soft_del = 1;
1115 }
1116 }
1117 }
1118
1119 /* Pruning removes any part of the file structure tree that is beyond the
1120 * bounds of the file (ie that does not point to chunks).
1121 *
1122 * A file should only get pruned when its size is reduced.
1123 *
1124 * Before pruning, the chunks must be pulled from the tree and the
1125 * level 0 tnode entries must be zeroed out.
1126 * Could also use this for file deletion, but that's probably better handled
1127 * by a special case.
1128 *
1129 * This function is recursive. For levels > 0 the function is called again on
1130 * any sub-tree. For level == 0 we just check if the sub-tree has data.
1131 * If there is no data in a subtree then it is pruned.
1132 */
1133
1134 static yaffs_tnode_t *yaffs_prune_worker(yaffs_dev_t *dev, yaffs_tnode_t *tn,
1135 __u32 level, int del0)
1136 {
1137 int i;
1138 int hasData;
1139
1140 if (tn) {
1141 hasData = 0;
1142
1143 if(level > 0){
1144 for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
1145 if (tn->internal[i]) {
1146 tn->internal[i] =
1147 yaffs_prune_worker(dev, tn->internal[i],
1148 level - 1,
1149 (i == 0) ? del0 : 1);
1150 }
1151
1152 if (tn->internal[i])
1153 hasData++;
1154 }
1155 } else {
1156 int tnode_size_u32 = dev->tnode_size/sizeof(__u32);
1157 __u32 *map = (__u32 *)tn;
1158
1159 for(i = 0; !hasData && i < tnode_size_u32; i++){
1160 if(map[i])
1161 hasData++;
1162 }
1163 }
1164
1165 if (hasData == 0 && del0) {
1166 /* Free and return NULL */
1167
1168 yaffs_free_tnode(dev, tn);
1169 tn = NULL;
1170 }
1171
1172 }
1173
1174 return tn;
1175
1176 }
1177
1178 static int yaffs_prune_tree(yaffs_dev_t *dev,
1179 yaffs_file_s *file_struct)
1180 {
1181 int i;
1182 int hasData;
1183 int done = 0;
1184 yaffs_tnode_t *tn;
1185
1186 if (file_struct->top_level > 0) {
1187 file_struct->top =
1188 yaffs_prune_worker(dev, file_struct->top, file_struct->top_level, 0);
1189
1190 /* Now we have a tree with all the non-zero branches NULL but the height
1191 * is the same as it was.
1192 * Let's see if we can trim internal tnodes to shorten the tree.
1193 * We can do this if only the 0th element in the tnode is in use
1194 * (ie all the non-zero are NULL)
1195 */
1196
1197 while (file_struct->top_level && !done) {
1198 tn = file_struct->top;
1199
1200 hasData = 0;
1201 for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
1202 if (tn->internal[i])
1203 hasData++;
1204 }
1205
1206 if (!hasData) {
1207 file_struct->top = tn->internal[0];
1208 file_struct->top_level--;
1209 yaffs_free_tnode(dev, tn);
1210 } else {
1211 done = 1;
1212 }
1213 }
1214 }
1215
1216 return YAFFS_OK;
1217 }
1218
1219 /*-------------------- End of File Structure functions.-------------------*/
1220
1221
1222 /* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */
1223 static yaffs_obj_t *yaffs_alloc_empty_obj(yaffs_dev_t *dev)
1224 {
1225 yaffs_obj_t *obj = yaffs_alloc_raw_obj(dev);
1226
1227 if (obj) {
1228 dev->n_obj++;
1229
1230 /* Now sweeten it up... */
1231
1232 memset(obj, 0, sizeof(yaffs_obj_t));
1233 obj->being_created = 1;
1234
1235 obj->my_dev = dev;
1236 obj->hdr_chunk = 0;
1237 obj->variant_type = YAFFS_OBJECT_TYPE_UNKNOWN;
1238 YINIT_LIST_HEAD(&(obj->hard_links));
1239 YINIT_LIST_HEAD(&(obj->hash_link));
1240 YINIT_LIST_HEAD(&obj->siblings);
1241
1242
1243 /* Now make the directory sane */
1244 if (dev->root_dir) {
1245 obj->parent = dev->root_dir;
1246 ylist_add(&(obj->siblings), &dev->root_dir->variant.dir_variant.children);
1247 }
1248
1249 /* Add it to the lost and found directory.
1250 * NB Can't put root or lostNFound in lostNFound so
1251 * check if lostNFound exists first
1252 */
1253 if (dev->lost_n_found)
1254 yaffs_add_obj_to_dir(dev->lost_n_found, obj);
1255
1256 obj->being_created = 0;
1257 }
1258
1259 dev->checkpoint_blocks_required = 0; /* force recalculation*/
1260
1261 return obj;
1262 }
1263
1264 static yaffs_obj_t *yaffs_create_fake_dir(yaffs_dev_t *dev, int number,
1265 __u32 mode)
1266 {
1267
1268 yaffs_obj_t *obj =
1269 yaffs_new_obj(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
1270 if (obj) {
1271 obj->fake = 1; /* it is fake so it might have no NAND presence... */
1272 obj->rename_allowed = 0; /* ... and we're not allowed to rename it... */
1273 obj->unlink_allowed = 0; /* ... or unlink it */
1274 obj->deleted = 0;
1275 obj->unlinked = 0;
1276 obj->yst_mode = mode;
1277 obj->my_dev = dev;
1278 obj->hdr_chunk = 0; /* Not a valid chunk. */
1279 }
1280
1281 return obj;
1282
1283 }
1284
1285 static void yaffs_unhash_obj(yaffs_obj_t *obj)
1286 {
1287 int bucket;
1288 yaffs_dev_t *dev = obj->my_dev;
1289
1290 /* If it is still linked into the bucket list, free from the list */
1291 if (!ylist_empty(&obj->hash_link)) {
1292 ylist_del_init(&obj->hash_link);
1293 bucket = yaffs_hash_fn(obj->obj_id);
1294 dev->obj_bucket[bucket].count--;
1295 }
1296 }
1297
1298 /* FreeObject frees up a Object and puts it back on the free list */
1299 static void yaffs_free_obj(yaffs_obj_t *obj)
1300 {
1301 yaffs_dev_t *dev = obj->my_dev;
1302
1303 T(YAFFS_TRACE_OS, (TSTR("FreeObject %p inode %p"TENDSTR), obj, obj->my_inode));
1304
1305 if (!obj)
1306 YBUG();
1307 if (obj->parent)
1308 YBUG();
1309 if (!ylist_empty(&obj->siblings))
1310 YBUG();
1311
1312
1313 if (obj->my_inode) {
1314 /* We're still hooked up to a cached inode.
1315 * Don't delete now, but mark for later deletion
1316 */
1317 obj->defered_free = 1;
1318 return;
1319 }
1320
1321 yaffs_unhash_obj(obj);
1322
1323 yaffs_free_raw_obj(dev,obj);
1324 dev->n_obj--;
1325 dev->checkpoint_blocks_required = 0; /* force recalculation*/
1326 }
1327
1328
1329 void yaffs_handle_defered_free(yaffs_obj_t *obj)
1330 {
1331 if (obj->defered_free)
1332 yaffs_free_obj(obj);
1333 }
1334
1335 static void yaffs_init_tnodes_and_objs(yaffs_dev_t *dev)
1336 {
1337 int i;
1338
1339 dev->n_obj = 0;
1340 dev->n_tnodes = 0;
1341
1342 yaffs_init_raw_tnodes_and_objs(dev);
1343
1344 for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
1345 YINIT_LIST_HEAD(&dev->obj_bucket[i].list);
1346 dev->obj_bucket[i].count = 0;
1347 }
1348 }
1349
1350 static int yaffs_find_nice_bucket(yaffs_dev_t *dev)
1351 {
1352 int i;
1353 int l = 999;
1354 int lowest = 999999;
1355
1356
1357 /* Search for the shortest list or one that
1358 * isn't too long.
1359 */
1360
1361 for (i = 0; i < 10 && lowest > 4; i++) {
1362 dev->bucket_finder++;
1363 dev->bucket_finder %= YAFFS_NOBJECT_BUCKETS;
1364 if (dev->obj_bucket[dev->bucket_finder].count < lowest) {
1365 lowest = dev->obj_bucket[dev->bucket_finder].count;
1366 l = dev->bucket_finder;
1367 }
1368
1369 }
1370
1371 return l;
1372 }
1373
1374 static int yaffs_new_obj_id(yaffs_dev_t *dev)
1375 {
1376 int bucket = yaffs_find_nice_bucket(dev);
1377
1378 /* Now find an object value that has not already been taken
1379 * by scanning the list.
1380 */
1381
1382 int found = 0;
1383 struct ylist_head *i;
1384
1385 __u32 n = (__u32) bucket;
1386
1387 /* yaffs_check_obj_hash_sane(); */
1388
1389 while (!found) {
1390 found = 1;
1391 n += YAFFS_NOBJECT_BUCKETS;
1392 if (1 || dev->obj_bucket[bucket].count > 0) {
1393 ylist_for_each(i, &dev->obj_bucket[bucket].list) {
1394 /* If there is already one in the list */
1395 if (i && ylist_entry(i, yaffs_obj_t,
1396 hash_link)->obj_id == n) {
1397 found = 0;
1398 }
1399 }
1400 }
1401 }
1402
1403 return n;
1404 }
1405
1406 static void yaffs_hash_obj(yaffs_obj_t *in)
1407 {
1408 int bucket = yaffs_hash_fn(in->obj_id);
1409 yaffs_dev_t *dev = in->my_dev;
1410
1411 ylist_add(&in->hash_link, &dev->obj_bucket[bucket].list);
1412 dev->obj_bucket[bucket].count++;
1413 }
1414
1415 yaffs_obj_t *yaffs_find_by_number(yaffs_dev_t *dev, __u32 number)
1416 {
1417 int bucket = yaffs_hash_fn(number);
1418 struct ylist_head *i;
1419 yaffs_obj_t *in;
1420
1421 ylist_for_each(i, &dev->obj_bucket[bucket].list) {
1422 /* Look if it is in the list */
1423 if (i) {
1424 in = ylist_entry(i, yaffs_obj_t, hash_link);
1425 if (in->obj_id == number) {
1426
1427 /* Don't tell the VFS about this one if it is defered free */
1428 if (in->defered_free)
1429 return NULL;
1430
1431 return in;
1432 }
1433 }
1434 }
1435
1436 return NULL;
1437 }
1438
1439 yaffs_obj_t *yaffs_new_obj(yaffs_dev_t *dev, int number,
1440 yaffs_obj_type type)
1441 {
1442 yaffs_obj_t *theObject=NULL;
1443 yaffs_tnode_t *tn = NULL;
1444
1445 if (number < 0)
1446 number = yaffs_new_obj_id(dev);
1447
1448 if (type == YAFFS_OBJECT_TYPE_FILE) {
1449 tn = yaffs_get_tnode(dev);
1450 if (!tn)
1451 return NULL;
1452 }
1453
1454 theObject = yaffs_alloc_empty_obj(dev);
1455 if (!theObject){
1456 if(tn)
1457 yaffs_free_tnode(dev,tn);
1458 return NULL;
1459 }
1460
1461
1462 if (theObject) {
1463 theObject->fake = 0;
1464 theObject->rename_allowed = 1;
1465 theObject->unlink_allowed = 1;
1466 theObject->obj_id = number;
1467 yaffs_hash_obj(theObject);
1468 theObject->variant_type = type;
1469 #ifdef CONFIG_YAFFS_WINCE
1470 yfsd_win_file_time_now(theObject->win_atime);
1471 theObject->win_ctime[0] = theObject->win_mtime[0] =
1472 theObject->win_atime[0];
1473 theObject->win_ctime[1] = theObject->win_mtime[1] =
1474 theObject->win_atime[1];
1475
1476 #else
1477
1478 theObject->yst_atime = theObject->yst_mtime =
1479 theObject->yst_ctime = Y_CURRENT_TIME;
1480 #endif
1481 switch (type) {
1482 case YAFFS_OBJECT_TYPE_FILE:
1483 theObject->variant.file_variant.file_size = 0;
1484 theObject->variant.file_variant.scanned_size = 0;
1485 theObject->variant.file_variant.shrink_size = 0xFFFFFFFF; /* max __u32 */
1486 theObject->variant.file_variant.top_level = 0;
1487 theObject->variant.file_variant.top = tn;
1488 break;
1489 case YAFFS_OBJECT_TYPE_DIRECTORY:
1490 YINIT_LIST_HEAD(&theObject->variant.dir_variant.
1491 children);
1492 YINIT_LIST_HEAD(&theObject->variant.dir_variant.
1493 dirty);
1494 break;
1495 case YAFFS_OBJECT_TYPE_SYMLINK:
1496 case YAFFS_OBJECT_TYPE_HARDLINK:
1497 case YAFFS_OBJECT_TYPE_SPECIAL:
1498 /* No action required */
1499 break;
1500 case YAFFS_OBJECT_TYPE_UNKNOWN:
1501 /* todo this should not happen */
1502 break;
1503 }
1504 }
1505
1506 return theObject;
1507 }
1508
1509 yaffs_obj_t *yaffs_find_or_create_by_number(yaffs_dev_t *dev,
1510 int number,
1511 yaffs_obj_type type)
1512 {
1513 yaffs_obj_t *theObject = NULL;
1514
1515 if (number > 0)
1516 theObject = yaffs_find_by_number(dev, number);
1517
1518 if (!theObject)
1519 theObject = yaffs_new_obj(dev, number, type);
1520
1521 return theObject;
1522
1523 }
1524
1525
1526 YCHAR *yaffs_clone_str(const YCHAR *str)
1527 {
1528 YCHAR *newStr = NULL;
1529 int len;
1530
1531 if (!str)
1532 str = _Y("");
1533
1534 len = yaffs_strnlen(str,YAFFS_MAX_ALIAS_LENGTH);
1535 newStr = YMALLOC((len + 1) * sizeof(YCHAR));
1536 if (newStr){
1537 yaffs_strncpy(newStr, str,len);
1538 newStr[len] = 0;
1539 }
1540 return newStr;
1541
1542 }
1543
1544 /*
1545 * Mknod (create) a new object.
1546 * equiv_obj only has meaning for a hard link;
1547 * aliasString only has meaning for a symlink.
1548 * rdev only has meaning for devices (a subset of special objects)
1549 */
1550
1551 static yaffs_obj_t *yaffs_create_obj(yaffs_obj_type type,
1552 yaffs_obj_t *parent,
1553 const YCHAR *name,
1554 __u32 mode,
1555 __u32 uid,
1556 __u32 gid,
1557 yaffs_obj_t *equiv_obj,
1558 const YCHAR *aliasString, __u32 rdev)
1559 {
1560 yaffs_obj_t *in;
1561 YCHAR *str = NULL;
1562
1563 yaffs_dev_t *dev = parent->my_dev;
1564
1565 /* Check if the entry exists. If it does then fail the call since we don't want a dup.*/
1566 if (yaffs_find_by_name(parent, name))
1567 return NULL;
1568
1569 if (type == YAFFS_OBJECT_TYPE_SYMLINK) {
1570 str = yaffs_clone_str(aliasString);
1571 if (!str)
1572 return NULL;
1573 }
1574
1575 in = yaffs_new_obj(dev, -1, type);
1576
1577 if (!in){
1578 if(str)
1579 YFREE(str);
1580 return NULL;
1581 }
1582
1583
1584
1585
1586
1587 if (in) {
1588 in->hdr_chunk = 0;
1589 in->valid = 1;
1590 in->variant_type = type;
1591
1592 in->yst_mode = mode;
1593
1594 #ifdef CONFIG_YAFFS_WINCE
1595 yfsd_win_file_time_now(in->win_atime);
1596 in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
1597 in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1];
1598
1599 #else
1600 in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME;
1601
1602 in->yst_rdev = rdev;
1603 in->yst_uid = uid;
1604 in->yst_gid = gid;
1605 #endif
1606 in->n_data_chunks = 0;
1607
1608 yaffs_set_obj_name(in, name);
1609 in->dirty = 1;
1610
1611 yaffs_add_obj_to_dir(parent, in);
1612
1613 in->my_dev = parent->my_dev;
1614
1615 switch (type) {
1616 case YAFFS_OBJECT_TYPE_SYMLINK:
1617 in->variant.symlink_variant.alias = str;
1618 break;
1619 case YAFFS_OBJECT_TYPE_HARDLINK:
1620 in->variant.hardlink_variant.equiv_obj =
1621 equiv_obj;
1622 in->variant.hardlink_variant.equiv_id =
1623 equiv_obj->obj_id;
1624 ylist_add(&in->hard_links, &equiv_obj->hard_links);
1625 break;
1626 case YAFFS_OBJECT_TYPE_FILE:
1627 case YAFFS_OBJECT_TYPE_DIRECTORY:
1628 case YAFFS_OBJECT_TYPE_SPECIAL:
1629 case YAFFS_OBJECT_TYPE_UNKNOWN:
1630 /* do nothing */
1631 break;
1632 }
1633
1634 if (yaffs_update_oh(in, name, 0, 0, 0, NULL) < 0) {
1635 /* Could not create the object header, fail the creation */
1636 yaffs_del_obj(in);
1637 in = NULL;
1638 }
1639
1640 yaffs_update_parent(parent);
1641 }
1642
1643 return in;
1644 }
1645
1646 yaffs_obj_t *yaffs_create_file(yaffs_obj_t *parent, const YCHAR *name,
1647 __u32 mode, __u32 uid, __u32 gid)
1648 {
1649 return yaffs_create_obj(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
1650 uid, gid, NULL, NULL, 0);
1651 }
1652
1653 yaffs_obj_t *yaffs_create_dir(yaffs_obj_t *parent, const YCHAR *name,
1654 __u32 mode, __u32 uid, __u32 gid)
1655 {
1656 return yaffs_create_obj(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
1657 mode, uid, gid, NULL, NULL, 0);
1658 }
1659
1660 yaffs_obj_t *yaffs_create_special(yaffs_obj_t *parent, const YCHAR *name,
1661 __u32 mode, __u32 uid, __u32 gid, __u32 rdev)
1662 {
1663 return yaffs_create_obj(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
1664 uid, gid, NULL, NULL, rdev);
1665 }
1666
1667 yaffs_obj_t *yaffs_create_symlink(yaffs_obj_t *parent, const YCHAR *name,
1668 __u32 mode, __u32 uid, __u32 gid,
1669 const YCHAR *alias)
1670 {
1671 return yaffs_create_obj(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
1672 uid, gid, NULL, alias, 0);
1673 }
1674
1675 /* yaffs_link_obj returns the object id of the equivalent object.*/
1676 yaffs_obj_t *yaffs_link_obj(yaffs_obj_t *parent, const YCHAR *name,
1677 yaffs_obj_t *equiv_obj)
1678 {
1679 /* Get the real object in case we were fed a hard link as an equivalent object */
1680 equiv_obj = yaffs_get_equivalent_obj(equiv_obj);
1681
1682 if (yaffs_create_obj
1683 (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0,
1684 equiv_obj, NULL, 0)) {
1685 return equiv_obj;
1686 } else {
1687 return NULL;
1688 }
1689
1690 }
1691
1692 static int yaffs_change_obj_name(yaffs_obj_t *obj, yaffs_obj_t *new_dir,
1693 const YCHAR *new_name, int force, int shadows)
1694 {
1695 int unlinkOp;
1696 int deleteOp;
1697
1698 yaffs_obj_t *existingTarget;
1699
1700 if (new_dir == NULL)
1701 new_dir = obj->parent; /* use the old directory */
1702
1703 if (new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
1704 T(YAFFS_TRACE_ALWAYS,
1705 (TSTR
1706 ("tragedy: yaffs_change_obj_name: new_dir is not a directory"
1707 TENDSTR)));
1708 YBUG();
1709 }
1710
1711 /* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */
1712 if (obj->my_dev->param.is_yaffs2)
1713 unlinkOp = (new_dir == obj->my_dev->unlinked_dir);
1714 else
1715 unlinkOp = (new_dir == obj->my_dev->unlinked_dir
1716 && obj->variant_type == YAFFS_OBJECT_TYPE_FILE);
1717
1718 deleteOp = (new_dir == obj->my_dev->del_dir);
1719
1720 existingTarget = yaffs_find_by_name(new_dir, new_name);
1721
1722 /* If the object is a file going into the unlinked directory,
1723 * then it is OK to just stuff it in since duplicate names are allowed.
1724 * else only proceed if the new name does not exist and if we're putting
1725 * it into a directory.
1726 */
1727 if ((unlinkOp ||
1728 deleteOp ||
1729 force ||
1730 (shadows > 0) ||
1731 !existingTarget) &&
1732 new_dir->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) {
1733 yaffs_set_obj_name(obj, new_name);
1734 obj->dirty = 1;
1735
1736 yaffs_add_obj_to_dir(new_dir, obj);
1737
1738 if (unlinkOp)
1739 obj->unlinked = 1;
1740
1741 /* If it is a deletion then we mark it as a shrink for gc purposes. */
1742 if (yaffs_update_oh(obj, new_name, 0, deleteOp, shadows, NULL) >= 0)
1743 return YAFFS_OK;
1744 }
1745
1746 return YAFFS_FAIL;
1747 }
1748
1749 int yaffs_rename_obj(yaffs_obj_t *old_dir, const YCHAR *old_name,
1750 yaffs_obj_t *new_dir, const YCHAR *new_name)
1751 {
1752 yaffs_obj_t *obj = NULL;
1753 yaffs_obj_t *existingTarget = NULL;
1754 int force = 0;
1755 int result;
1756 yaffs_dev_t *dev;
1757
1758
1759 if (!old_dir || old_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
1760 YBUG();
1761 if (!new_dir || new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
1762 YBUG();
1763
1764 dev = old_dir->my_dev;
1765
1766 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
1767 /* Special case for case insemsitive systems (eg. WinCE).
1768 * While look-up is case insensitive, the name isn't.
1769 * Therefore we might want to change x.txt to X.txt
1770 */
1771 if (old_dir == new_dir && yaffs_strcmp(old_name, new_name) == 0)
1772 force = 1;
1773 #endif
1774
1775 if(yaffs_strnlen(new_name,YAFFS_MAX_NAME_LENGTH+1) > YAFFS_MAX_NAME_LENGTH)
1776 /* ENAMETOOLONG */
1777 return YAFFS_FAIL;
1778
1779 obj = yaffs_find_by_name(old_dir, old_name);
1780
1781 if (obj && obj->rename_allowed) {
1782
1783 /* Now do the handling for an existing target, if there is one */
1784
1785 existingTarget = yaffs_find_by_name(new_dir, new_name);
1786 if (existingTarget &&
1787 existingTarget->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY &&
1788 !ylist_empty(&existingTarget->variant.dir_variant.children)) {
1789 /* There is a target that is a non-empty directory, so we fail */
1790 return YAFFS_FAIL; /* EEXIST or ENOTEMPTY */
1791 } else if (existingTarget && existingTarget != obj) {
1792 /* Nuke the target first, using shadowing,
1793 * but only if it isn't the same object.
1794 *
1795 * Note we must disable gc otherwise it can mess up the shadowing.
1796 *
1797 */
1798 dev->gc_disable=1;
1799 yaffs_change_obj_name(obj, new_dir, new_name, force,
1800 existingTarget->obj_id);
1801 existingTarget->is_shadowed = 1;
1802 yaffs_unlink_obj(existingTarget);
1803 dev->gc_disable=0;
1804 }
1805
1806 result = yaffs_change_obj_name(obj, new_dir, new_name, 1, 0);
1807
1808 yaffs_update_parent(old_dir);
1809 if(new_dir != old_dir)
1810 yaffs_update_parent(new_dir);
1811
1812 return result;
1813 }
1814 return YAFFS_FAIL;
1815 }
1816
1817 /*------------------------- Block Management and Page Allocation ----------------*/
1818
1819 static int yaffs_init_blocks(yaffs_dev_t *dev)
1820 {
1821 int nBlocks = dev->internal_end_block - dev->internal_start_block + 1;
1822
1823 dev->block_info = NULL;
1824 dev->chunk_bits = NULL;
1825
1826 dev->alloc_block = -1; /* force it to get a new one */
1827
1828 /* If the first allocation strategy fails, thry the alternate one */
1829 dev->block_info = YMALLOC(nBlocks * sizeof(yaffs_block_info_t));
1830 if (!dev->block_info) {
1831 dev->block_info = YMALLOC_ALT(nBlocks * sizeof(yaffs_block_info_t));
1832 dev->block_info_alt = 1;
1833 } else
1834 dev->block_info_alt = 0;
1835
1836 if (dev->block_info) {
1837 /* Set up dynamic blockinfo stuff. */
1838 dev->chunk_bit_stride = (dev->param.chunks_per_block + 7) / 8; /* round up bytes */
1839 dev->chunk_bits = YMALLOC(dev->chunk_bit_stride * nBlocks);
1840 if (!dev->chunk_bits) {
1841 dev->chunk_bits = YMALLOC_ALT(dev->chunk_bit_stride * nBlocks);
1842 dev->chunk_bits_alt = 1;
1843 } else
1844 dev->chunk_bits_alt = 0;
1845 }
1846
1847 if (dev->block_info && dev->chunk_bits) {
1848 memset(dev->block_info, 0, nBlocks * sizeof(yaffs_block_info_t));
1849 memset(dev->chunk_bits, 0, dev->chunk_bit_stride * nBlocks);
1850 return YAFFS_OK;
1851 }
1852
1853 return YAFFS_FAIL;
1854 }
1855
1856 static void yaffs_deinit_blocks(yaffs_dev_t *dev)
1857 {
1858 if (dev->block_info_alt && dev->block_info)
1859 YFREE_ALT(dev->block_info);
1860 else if (dev->block_info)
1861 YFREE(dev->block_info);
1862
1863 dev->block_info_alt = 0;
1864
1865 dev->block_info = NULL;
1866
1867 if (dev->chunk_bits_alt && dev->chunk_bits)
1868 YFREE_ALT(dev->chunk_bits);
1869 else if (dev->chunk_bits)
1870 YFREE(dev->chunk_bits);
1871 dev->chunk_bits_alt = 0;
1872 dev->chunk_bits = NULL;
1873 }
1874
1875 void yaffs_block_became_dirty(yaffs_dev_t *dev, int block_no)
1876 {
1877 yaffs_block_info_t *bi = yaffs_get_block_info(dev, block_no);
1878
1879 int erasedOk = 0;
1880
1881 /* If the block is still healthy erase it and mark as clean.
1882 * If the block has had a data failure, then retire it.
1883 */
1884
1885 T(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
1886 (TSTR("yaffs_block_became_dirty block %d state %d %s"TENDSTR),
1887 block_no, bi->block_state, (bi->needs_retiring) ? "needs retiring" : ""));
1888
1889 yaffs2_clear_oldest_dirty_seq(dev,bi);
1890
1891 bi->block_state = YAFFS_BLOCK_STATE_DIRTY;
1892
1893 /* If this is the block being garbage collected then stop gc'ing this block */
1894 if(block_no == dev->gc_block)
1895 dev->gc_block = 0;
1896
1897 /* If this block is currently the best candidate for gc then drop as a candidate */
1898 if(block_no == dev->gc_dirtiest){
1899 dev->gc_dirtiest = 0;
1900 dev->gc_pages_in_use = 0;
1901 }
1902
1903 if (!bi->needs_retiring) {
1904 yaffs2_checkpt_invalidate(dev);
1905 erasedOk = yaffs_erase_block(dev, block_no);
1906 if (!erasedOk) {
1907 dev->n_erase_failures++;
1908 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
1909 (TSTR("**>> Erasure failed %d" TENDSTR), block_no));
1910 }
1911 }
1912
1913 if (erasedOk &&
1914 ((yaffs_trace_mask & YAFFS_TRACE_ERASE) || !yaffs_skip_verification(dev))) {
1915 int i;
1916 for (i = 0; i < dev->param.chunks_per_block; i++) {
1917 if (!yaffs_check_chunk_erased
1918 (dev, block_no * dev->param.chunks_per_block + i)) {
1919 T(YAFFS_TRACE_ERROR,
1920 (TSTR
1921 (">>Block %d erasure supposedly OK, but chunk %d not erased"
1922 TENDSTR), block_no, i));
1923 }
1924 }
1925 }
1926
1927 if (erasedOk) {
1928 /* Clean it up... */
1929 bi->block_state = YAFFS_BLOCK_STATE_EMPTY;
1930 bi->seq_number = 0;
1931 dev->n_erased_blocks++;
1932 bi->pages_in_use = 0;
1933 bi->soft_del_pages = 0;
1934 bi->has_shrink_hdr = 0;
1935 bi->skip_erased_check = 1; /* This is clean, so no need to check */
1936 bi->gc_prioritise = 0;
1937 yaffs_clear_chunk_bits(dev, block_no);
1938
1939 T(YAFFS_TRACE_ERASE,
1940 (TSTR("Erased block %d" TENDSTR), block_no));
1941 } else {
1942 dev->n_free_chunks -= dev->param.chunks_per_block; /* We lost a block of free space */
1943
1944 yaffs_retire_block(dev, block_no);
1945 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
1946 (TSTR("**>> Block %d retired" TENDSTR), block_no));
1947 }
1948 }
1949
1950 static int yaffs_find_alloc_block(yaffs_dev_t *dev)
1951 {
1952 int i;
1953
1954 yaffs_block_info_t *bi;
1955
1956 if (dev->n_erased_blocks < 1) {
1957 /* Hoosterman we've got a problem.
1958 * Can't get space to gc
1959 */
1960 T(YAFFS_TRACE_ERROR,
1961 (TSTR("yaffs tragedy: no more erased blocks" TENDSTR)));
1962
1963 return -1;
1964 }
1965
1966 /* Find an empty block. */
1967
1968 for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
1969 dev->alloc_block_finder++;
1970 if (dev->alloc_block_finder < dev->internal_start_block
1971 || dev->alloc_block_finder > dev->internal_end_block) {
1972 dev->alloc_block_finder = dev->internal_start_block;
1973 }
1974
1975 bi = yaffs_get_block_info(dev, dev->alloc_block_finder);
1976
1977 if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) {
1978 bi->block_state = YAFFS_BLOCK_STATE_ALLOCATING;
1979 dev->seq_number++;
1980 bi->seq_number = dev->seq_number;
1981 dev->n_erased_blocks--;
1982 T(YAFFS_TRACE_ALLOCATE,
1983 (TSTR("Allocated block %d, seq %d, %d left" TENDSTR),
1984 dev->alloc_block_finder, dev->seq_number,
1985 dev->n_erased_blocks));
1986 return dev->alloc_block_finder;
1987 }
1988 }
1989
1990 T(YAFFS_TRACE_ALWAYS,
1991 (TSTR
1992 ("yaffs tragedy: no more erased blocks, but there should have been %d"
1993 TENDSTR), dev->n_erased_blocks));
1994
1995 return -1;
1996 }
1997
1998
1999 /*
2000 * Check if there's space to allocate...
2001 * Thinks.... do we need top make this ths same as yaffs_get_free_chunks()?
2002 */
2003 int yaffs_check_alloc_available(yaffs_dev_t *dev, int n_chunks)
2004 {
2005 int reservedChunks;
2006 int reservedBlocks = dev->param.n_reserved_blocks;
2007 int checkpointBlocks;
2008
2009 checkpointBlocks = yaffs_calc_checkpt_blocks_required(dev);
2010
2011 reservedChunks = ((reservedBlocks + checkpointBlocks) * dev->param.chunks_per_block);
2012
2013 return (dev->n_free_chunks > (reservedChunks + n_chunks));
2014 }
2015
2016 static int yaffs_alloc_chunk(yaffs_dev_t *dev, int useReserve,
2017 yaffs_block_info_t **blockUsedPtr)
2018 {
2019 int retVal;
2020 yaffs_block_info_t *bi;
2021
2022 if (dev->alloc_block < 0) {
2023 /* Get next block to allocate off */
2024 dev->alloc_block = yaffs_find_alloc_block(dev);
2025 dev->alloc_page = 0;
2026 }
2027
2028 if (!useReserve && !yaffs_check_alloc_available(dev, 1)) {
2029 /* Not enough space to allocate unless we're allowed to use the reserve. */
2030 return -1;
2031 }
2032
2033 if (dev->n_erased_blocks < dev->param.n_reserved_blocks
2034 && dev->alloc_page == 0) {
2035 T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR)));
2036 }
2037
2038 /* Next page please.... */
2039 if (dev->alloc_block >= 0) {
2040 bi = yaffs_get_block_info(dev, dev->alloc_block);
2041
2042 retVal = (dev->alloc_block * dev->param.chunks_per_block) +
2043 dev->alloc_page;
2044 bi->pages_in_use++;
2045 yaffs_set_chunk_bit(dev, dev->alloc_block,
2046 dev->alloc_page);
2047
2048 dev->alloc_page++;
2049
2050 dev->n_free_chunks--;
2051
2052 /* If the block is full set the state to full */
2053 if (dev->alloc_page >= dev->param.chunks_per_block) {
2054 bi->block_state = YAFFS_BLOCK_STATE_FULL;
2055 dev->alloc_block = -1;
2056 }
2057
2058 if (blockUsedPtr)
2059 *blockUsedPtr = bi;
2060
2061 return retVal;
2062 }
2063
2064 T(YAFFS_TRACE_ERROR,
2065 (TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
2066
2067 return -1;
2068 }
2069
2070 static int yaffs_get_erased_chunks(yaffs_dev_t *dev)
2071 {
2072 int n;
2073
2074 n = dev->n_erased_blocks * dev->param.chunks_per_block;
2075
2076 if (dev->alloc_block > 0)
2077 n += (dev->param.chunks_per_block - dev->alloc_page);
2078
2079 return n;
2080
2081 }
2082
2083 /*
2084 * yaffs_skip_rest_of_block() skips over the rest of the allocation block
2085 * if we don't want to write to it.
2086 */
2087 void yaffs_skip_rest_of_block(yaffs_dev_t *dev)
2088 {
2089 if(dev->alloc_block > 0){
2090 yaffs_block_info_t *bi = yaffs_get_block_info(dev, dev->alloc_block);
2091 if(bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING){
2092 bi->block_state = YAFFS_BLOCK_STATE_FULL;
2093 dev->alloc_block = -1;
2094 }
2095 }
2096 }
2097
2098
2099 static int yaffs_gc_block(yaffs_dev_t *dev, int block,
2100 int wholeBlock)
2101 {
2102 int oldChunk;
2103 int newChunk;
2104 int mark_flash;
2105 int retVal = YAFFS_OK;
2106 int i;
2107 int isCheckpointBlock;
2108 int matchingChunk;
2109 int maxCopies;
2110
2111 int chunksBefore = yaffs_get_erased_chunks(dev);
2112 int chunksAfter;
2113
2114 yaffs_ext_tags tags;
2115
2116 yaffs_block_info_t *bi = yaffs_get_block_info(dev, block);
2117
2118 yaffs_obj_t *object;
2119
2120 isCheckpointBlock = (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT);
2121
2122
2123 T(YAFFS_TRACE_TRACING,
2124 (TSTR("Collecting block %d, in use %d, shrink %d, wholeBlock %d" TENDSTR),
2125 block,
2126 bi->pages_in_use,
2127 bi->has_shrink_hdr,
2128 wholeBlock));
2129
2130 /*yaffs_verify_free_chunks(dev); */
2131
2132 if(bi->block_state == YAFFS_BLOCK_STATE_FULL)
2133 bi->block_state = YAFFS_BLOCK_STATE_COLLECTING;
2134
2135 bi->has_shrink_hdr = 0; /* clear the flag so that the block can erase */
2136
2137 dev->gc_disable = 1;
2138
2139 if (isCheckpointBlock ||
2140 !yaffs_still_some_chunks(dev, block)) {
2141 T(YAFFS_TRACE_TRACING,
2142 (TSTR
2143 ("Collecting block %d that has no chunks in use" TENDSTR),
2144 block));
2145 yaffs_block_became_dirty(dev, block);
2146 } else {
2147
2148 __u8 *buffer = yaffs_get_temp_buffer(dev, __LINE__);
2149
2150 yaffs_verify_blk(dev, bi, block);
2151
2152 maxCopies = (wholeBlock) ? dev->param.chunks_per_block : 5;
2153 oldChunk = block * dev->param.chunks_per_block + dev->gc_chunk;
2154
2155 for (/* init already done */;
2156 retVal == YAFFS_OK &&
2157 dev->gc_chunk < dev->param.chunks_per_block &&
2158 (bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) &&
2159 maxCopies > 0;
2160 dev->gc_chunk++, oldChunk++) {
2161 if (yaffs_check_chunk_bit(dev, block, dev->gc_chunk)) {
2162
2163 /* This page is in use and might need to be copied off */
2164
2165 maxCopies--;
2166
2167 mark_flash = 1;
2168
2169 yaffs_init_tags(&tags);
2170
2171 yaffs_rd_chunk_tags_nand(dev, oldChunk,
2172 buffer, &tags);
2173
2174 object =
2175 yaffs_find_by_number(dev,
2176 tags.obj_id);
2177
2178 T(YAFFS_TRACE_GC_DETAIL,
2179 (TSTR
2180 ("Collecting chunk in block %d, %d %d %d " TENDSTR),
2181 dev->gc_chunk, tags.obj_id, tags.chunk_id,
2182 tags.n_bytes));
2183
2184 if (object && !yaffs_skip_verification(dev)) {
2185 if (tags.chunk_id == 0)
2186 matchingChunk = object->hdr_chunk;
2187 else if (object->soft_del)
2188 matchingChunk = oldChunk; /* Defeat the test */
2189 else
2190 matchingChunk = yaffs_find_chunk_in_file(object, tags.chunk_id, NULL);
2191
2192 if (oldChunk != matchingChunk)
2193 T(YAFFS_TRACE_ERROR,
2194 (TSTR("gc: page in gc mismatch: %d %d %d %d"TENDSTR),
2195 oldChunk, matchingChunk, tags.obj_id, tags.chunk_id));
2196
2197 }
2198
2199 if (!object) {
2200 T(YAFFS_TRACE_ERROR,
2201 (TSTR
2202 ("page %d in gc has no object: %d %d %d "
2203 TENDSTR), oldChunk,
2204 tags.obj_id, tags.chunk_id, tags.n_bytes));
2205 }
2206
2207 if (object &&
2208 object->deleted &&
2209 object->soft_del &&
2210 tags.chunk_id != 0) {
2211 /* Data chunk in a soft deleted file, throw it away
2212 * It's a soft deleted data chunk,
2213 * No need to copy this, just forget about it and
2214 * fix up the object.
2215 */
2216
2217 /* Free chunks already includes softdeleted chunks.
2218 * How ever this chunk is going to soon be really deleted
2219 * which will increment free chunks.
2220 * We have to decrement free chunks so this works out properly.
2221 */
2222 dev->n_free_chunks--;
2223 bi->soft_del_pages--;
2224
2225 object->n_data_chunks--;
2226
2227 if (object->n_data_chunks <= 0) {
2228 /* remeber to clean up the object */
2229 dev->gc_cleanup_list[dev->n_clean_ups] =
2230 tags.obj_id;
2231 dev->n_clean_ups++;
2232 }
2233 mark_flash = 0;
2234 } else if (0) {
2235 /* Todo object && object->deleted && object->n_data_chunks == 0 */
2236 /* Deleted object header with no data chunks.
2237 * Can be discarded and the file deleted.
2238 */
2239 object->hdr_chunk = 0;
2240 yaffs_free_tnode(object->my_dev,
2241 object->variant.
2242 file_variant.top);
2243 object->variant.file_variant.top = NULL;
2244 yaffs_generic_obj_del(object);
2245
2246 } else if (object) {
2247 /* It's either a data chunk in a live file or
2248 * an ObjectHeader, so we're interested in it.
2249 * NB Need to keep the ObjectHeaders of deleted files
2250 * until the whole file has been deleted off
2251 */
2252 tags.serial_number++;
2253
2254 dev->n_gc_copies++;
2255
2256 if (tags.chunk_id == 0) {
2257 /* It is an object Id,
2258 * We need to nuke the shrinkheader flags first
2259 * Also need to clean up shadowing.
2260 * We no longer want the shrinkHeader flag since its work is done
2261 * and if it is left in place it will mess up scanning.
2262 */
2263
2264 yaffs_obj_header *oh;
2265 oh = (yaffs_obj_header *)buffer;
2266
2267 oh->is_shrink = 0;
2268 tags.extra_is_shrink = 0;
2269
2270 oh->shadows_obj = 0;
2271 oh->inband_shadowed_obj_id = 0;
2272 tags.extra_shadows = 0;
2273
2274 /* Update file size */
2275 if(object->variant_type == YAFFS_OBJECT_TYPE_FILE){
2276 oh->file_size = object->variant.file_variant.file_size;
2277 tags.extra_length = oh->file_size;
2278 }
2279
2280 yaffs_verify_oh(object, oh, &tags, 1);
2281 newChunk =
2282 yaffs_write_new_chunk(dev,(__u8 *) oh, &tags, 1);
2283 } else
2284 newChunk =
2285 yaffs_write_new_chunk(dev, buffer, &tags, 1);
2286
2287 if (newChunk < 0) {
2288 retVal = YAFFS_FAIL;
2289 } else {
2290
2291 /* Ok, now fix up the Tnodes etc. */
2292
2293 if (tags.chunk_id == 0) {
2294 /* It's a header */
2295 object->hdr_chunk = newChunk;
2296 object->serial = tags.serial_number;
2297 } else {
2298 /* It's a data chunk */
2299 int ok;
2300 ok = yaffs_put_chunk_in_file
2301 (object,
2302 tags.chunk_id,
2303 newChunk, 0);
2304 }
2305 }
2306 }
2307
2308 if (retVal == YAFFS_OK)
2309 yaffs_chunk_del(dev, oldChunk, mark_flash, __LINE__);
2310
2311 }
2312 }
2313
2314 yaffs_release_temp_buffer(dev, buffer, __LINE__);
2315
2316
2317
2318 }
2319
2320 yaffs_verify_collected_blk(dev, bi, block);
2321
2322
2323
2324 if (bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) {
2325 /*
2326 * The gc did not complete. Set block state back to FULL
2327 * because checkpointing does not restore gc.
2328 */
2329 bi->block_state = YAFFS_BLOCK_STATE_FULL;
2330 } else {
2331 /* The gc completed. */
2332 /* Do any required cleanups */
2333 for (i = 0; i < dev->n_clean_ups; i++) {
2334 /* Time to delete the file too */
2335 object =
2336 yaffs_find_by_number(dev,
2337 dev->gc_cleanup_list[i]);
2338 if (object) {
2339 yaffs_free_tnode(dev,
2340 object->variant.file_variant.
2341 top);
2342 object->variant.file_variant.top = NULL;
2343 T(YAFFS_TRACE_GC,
2344 (TSTR
2345 ("yaffs: About to finally delete object %d"
2346 TENDSTR), object->obj_id));
2347 yaffs_generic_obj_del(object);
2348 object->my_dev->n_deleted_files--;
2349 }
2350
2351 }
2352
2353
2354 chunksAfter = yaffs_get_erased_chunks(dev);
2355 if (chunksBefore >= chunksAfter) {
2356 T(YAFFS_TRACE_GC,
2357 (TSTR
2358 ("gc did not increase free chunks before %d after %d"
2359 TENDSTR), chunksBefore, chunksAfter));
2360 }
2361 dev->gc_block = 0;
2362 dev->gc_chunk = 0;
2363 dev->n_clean_ups = 0;
2364 }
2365
2366 dev->gc_disable = 0;
2367
2368 return retVal;
2369 }
2370
2371 /*
2372 * FindBlockForgarbageCollection is used to select the dirtiest block (or close enough)
2373 * for garbage collection.
2374 */
2375
2376 static unsigned yaffs_find_gc_block(yaffs_dev_t *dev,
2377 int aggressive,
2378 int background)
2379 {
2380 int i;
2381 int iterations;
2382 unsigned selected = 0;
2383 int prioritised = 0;
2384 int prioritisedExists = 0;
2385 yaffs_block_info_t *bi;
2386 int threshold;
2387
2388 /* First let's see if we need to grab a prioritised block */
2389 if (dev->has_pending_prioritised_gc && !aggressive) {
2390 dev->gc_dirtiest = 0;
2391 bi = dev->block_info;
2392 for (i = dev->internal_start_block;
2393 i <= dev->internal_end_block && !selected;
2394 i++) {
2395
2396 if (bi->gc_prioritise) {
2397 prioritisedExists = 1;
2398 if (bi->block_state == YAFFS_BLOCK_STATE_FULL &&
2399 yaffs_block_ok_for_gc(dev, bi)) {
2400 selected = i;
2401 prioritised = 1;
2402 }
2403 }
2404 bi++;
2405 }
2406
2407 /*
2408 * If there is a prioritised block and none was selected then
2409 * this happened because there is at least one old dirty block gumming
2410 * up the works. Let's gc the oldest dirty block.
2411 */
2412
2413 if(prioritisedExists &&
2414 !selected &&
2415 dev->oldest_dirty_block > 0)
2416 selected = dev->oldest_dirty_block;
2417
2418 if (!prioritisedExists) /* None found, so we can clear this */
2419 dev->has_pending_prioritised_gc = 0;
2420 }
2421
2422 /* If we're doing aggressive GC then we are happy to take a less-dirty block, and
2423 * search harder.
2424 * else (we're doing a leasurely gc), then we only bother to do this if the
2425 * block has only a few pages in use.
2426 */
2427
2428 if (!selected){
2429 int pagesUsed;
2430 int nBlocks = dev->internal_end_block - dev->internal_start_block + 1;
2431 if (aggressive){
2432 threshold = dev->param.chunks_per_block;
2433 iterations = nBlocks;
2434 } else {
2435 int maxThreshold;
2436
2437 if(background)
2438 maxThreshold = dev->param.chunks_per_block/2;
2439 else
2440 maxThreshold = dev->param.chunks_per_block/8;
2441
2442 if(maxThreshold < YAFFS_GC_PASSIVE_THRESHOLD)
2443 maxThreshold = YAFFS_GC_PASSIVE_THRESHOLD;
2444
2445 threshold = background ?
2446 (dev->gc_not_done + 2) * 2 : 0;
2447 if(threshold <YAFFS_GC_PASSIVE_THRESHOLD)
2448 threshold = YAFFS_GC_PASSIVE_THRESHOLD;
2449 if(threshold > maxThreshold)
2450 threshold = maxThreshold;
2451
2452 iterations = nBlocks / 16 + 1;
2453 if (iterations > 100)
2454 iterations = 100;
2455 }
2456
2457 for (i = 0;
2458 i < iterations &&
2459 (dev->gc_dirtiest < 1 ||
2460 dev->gc_pages_in_use > YAFFS_GC_GOOD_ENOUGH);
2461 i++) {
2462 dev->gc_block_finder++;
2463 if (dev->gc_block_finder < dev->internal_start_block ||
2464 dev->gc_block_finder > dev->internal_end_block)
2465 dev->gc_block_finder = dev->internal_start_block;
2466
2467 bi = yaffs_get_block_info(dev, dev->gc_block_finder);
2468
2469 pagesUsed = bi->pages_in_use - bi->soft_del_pages;
2470
2471 if (bi->block_state == YAFFS_BLOCK_STATE_FULL &&
2472 pagesUsed < dev->param.chunks_per_block &&
2473 (dev->gc_dirtiest < 1 || pagesUsed < dev->gc_pages_in_use) &&
2474 yaffs_block_ok_for_gc(dev, bi)) {
2475 dev->gc_dirtiest = dev->gc_block_finder;
2476 dev->gc_pages_in_use = pagesUsed;
2477 }
2478 }
2479
2480 if(dev->gc_dirtiest > 0 && dev->gc_pages_in_use <= threshold)
2481 selected = dev->gc_dirtiest;
2482 }
2483
2484 /*
2485 * If nothing has been selected for a while, try selecting the oldest dirty
2486 * because that's gumming up the works.
2487 */
2488
2489 if(!selected && dev->param.is_yaffs2 &&
2490 dev->gc_not_done >= ( background ? 10 : 20)){
2491 yaffs2_find_oldest_dirty_seq(dev);
2492 if(dev->oldest_dirty_block > 0) {
2493 selected = dev->oldest_dirty_block;
2494 dev->gc_dirtiest = selected;
2495 dev->oldest_dirty_gc_count++;
2496 bi = yaffs_get_block_info(dev, selected);
2497 dev->gc_pages_in_use = bi->pages_in_use - bi->soft_del_pages;
2498 } else
2499 dev->gc_not_done = 0;
2500 }
2501
2502 if(selected){
2503 T(YAFFS_TRACE_GC,
2504 (TSTR("GC Selected block %d with %d free, prioritised:%d" TENDSTR),
2505 selected,
2506 dev->param.chunks_per_block - dev->gc_pages_in_use,
2507 prioritised));
2508
2509 dev->n_gc_blocks++;
2510 if(background)
2511 dev->bg_gcs++;
2512
2513 dev->gc_dirtiest = 0;
2514 dev->gc_pages_in_use = 0;
2515 dev->gc_not_done = 0;
2516 if(dev->refresh_skip > 0)
2517 dev->refresh_skip--;
2518 } else{
2519 dev->gc_not_done++;
2520 T(YAFFS_TRACE_GC,
2521 (TSTR("GC none: finder %d skip %d threshold %d dirtiest %d using %d oldest %d%s" TENDSTR),
2522 dev->gc_block_finder, dev->gc_not_done,
2523 threshold,
2524 dev->gc_dirtiest, dev->gc_pages_in_use,
2525 dev->oldest_dirty_block,
2526 background ? " bg" : ""));
2527 }
2528
2529 return selected;
2530 }
2531
2532 /* New garbage collector
2533 * If we're very low on erased blocks then we do aggressive garbage collection
2534 * otherwise we do "leasurely" garbage collection.
2535 * Aggressive gc looks further (whole array) and will accept less dirty blocks.
2536 * Passive gc only inspects smaller areas and will only accept more dirty blocks.
2537 *
2538 * The idea is to help clear out space in a more spread-out manner.
2539 * Dunno if it really does anything useful.
2540 */
2541 static int yaffs_check_gc(yaffs_dev_t *dev, int background)
2542 {
2543 int aggressive = 0;
2544 int gcOk = YAFFS_OK;
2545 int maxTries = 0;
2546 int minErased;
2547 int erasedChunks;
2548 int checkpointBlockAdjust;
2549
2550 if(dev->param.gc_control &&
2551 (dev->param.gc_control(dev) & 1) == 0)
2552 return YAFFS_OK;
2553
2554 if (dev->gc_disable) {
2555 /* Bail out so we don't get recursive gc */
2556 return YAFFS_OK;
2557 }
2558
2559 /* This loop should pass the first time.
2560 * We'll only see looping here if the collection does not increase space.
2561 */
2562
2563 do {
2564 maxTries++;
2565
2566 checkpointBlockAdjust = yaffs_calc_checkpt_blocks_required(dev);
2567
2568 minErased = dev->param.n_reserved_blocks + checkpointBlockAdjust + 1;
2569 erasedChunks = dev->n_erased_blocks * dev->param.chunks_per_block;
2570
2571 /* If we need a block soon then do aggressive gc.*/
2572 if (dev->n_erased_blocks < minErased)
2573 aggressive = 1;
2574 else {
2575 if(!background && erasedChunks > (dev->n_free_chunks / 4))
2576 break;
2577
2578 if(dev->gc_skip > 20)
2579 dev->gc_skip = 20;
2580 if(erasedChunks < dev->n_free_chunks/2 ||
2581 dev->gc_skip < 1 ||
2582 background)
2583 aggressive = 0;
2584 else {
2585 dev->gc_skip--;
2586 break;
2587 }
2588 }
2589
2590 dev->gc_skip = 5;
2591
2592 /* If we don't already have a block being gc'd then see if we should start another */
2593
2594 if (dev->gc_block < 1 && !aggressive) {
2595 dev->gc_block = yaffs2_find_refresh_block(dev);
2596 dev->gc_chunk = 0;
2597 dev->n_clean_ups=0;
2598 }
2599 if (dev->gc_block < 1) {
2600 dev->gc_block = yaffs_find_gc_block(dev, aggressive, background);
2601 dev->gc_chunk = 0;
2602 dev->n_clean_ups=0;
2603 }
2604
2605 if (dev->gc_block > 0) {
2606 dev->all_gcs++;
2607 if (!aggressive)
2608 dev->passive_gc_count++;
2609
2610 T(YAFFS_TRACE_GC,
2611 (TSTR
2612 ("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),
2613 dev->n_erased_blocks, aggressive));
2614
2615 gcOk = yaffs_gc_block(dev, dev->gc_block, aggressive);
2616 }
2617
2618 if (dev->n_erased_blocks < (dev->param.n_reserved_blocks) && dev->gc_block > 0) {
2619 T(YAFFS_TRACE_GC,
2620 (TSTR
2621 ("yaffs: GC !!!no reclaim!!! erasedBlocks %d after try %d block %d"
2622 TENDSTR), dev->n_erased_blocks, maxTries, dev->gc_block));
2623 }
2624 } while ((dev->n_erased_blocks < dev->param.n_reserved_blocks) &&
2625 (dev->gc_block > 0) &&
2626 (maxTries < 2));
2627
2628 return aggressive ? gcOk : YAFFS_OK;
2629 }
2630
2631 /*
2632 * yaffs_bg_gc()
2633 * Garbage collects. Intended to be called from a background thread.
2634 * Returns non-zero if at least half the free chunks are erased.
2635 */
2636 int yaffs_bg_gc(yaffs_dev_t *dev, unsigned urgency)
2637 {
2638 int erasedChunks = dev->n_erased_blocks * dev->param.chunks_per_block;
2639
2640 T(YAFFS_TRACE_BACKGROUND, (TSTR("Background gc %u" TENDSTR),urgency));
2641
2642 yaffs_check_gc(dev, 1);
2643 return erasedChunks > dev->n_free_chunks/2;
2644 }
2645
2646 /*------------------------- TAGS --------------------------------*/
2647
2648 static int yaffs_tags_match(const yaffs_ext_tags *tags, int obj_id,
2649 int chunkInObject)
2650 {
2651 return (tags->chunk_id == chunkInObject &&
2652 tags->obj_id == obj_id && !tags->is_deleted) ? 1 : 0;
2653
2654 }
2655
2656
2657 /*-------------------- Data file manipulation -----------------*/
2658
2659 static int yaffs_find_chunk_in_file(yaffs_obj_t *in, int inode_chunk,
2660 yaffs_ext_tags *tags)
2661 {
2662 /*Get the Tnode, then get the level 0 offset chunk offset */
2663 yaffs_tnode_t *tn;
2664 int theChunk = -1;
2665 yaffs_ext_tags localTags;
2666 int retVal = -1;
2667
2668 yaffs_dev_t *dev = in->my_dev;
2669
2670 if (!tags) {
2671 /* Passed a NULL, so use our own tags space */
2672 tags = &localTags;
2673 }
2674
2675 tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk);
2676
2677 if (tn) {
2678 theChunk = yaffs_get_group_base(dev, tn, inode_chunk);
2679
2680 retVal =
2681 yaffs_find_chunk_in_group(dev, theChunk, tags, in->obj_id,
2682 inode_chunk);
2683 }
2684 return retVal;
2685 }
2686
2687 static int yaffs_find_del_file_chunk(yaffs_obj_t *in, int inode_chunk,
2688 yaffs_ext_tags *tags)
2689 {
2690 /* Get the Tnode, then get the level 0 offset chunk offset */
2691 yaffs_tnode_t *tn;
2692 int theChunk = -1;
2693 yaffs_ext_tags localTags;
2694
2695 yaffs_dev_t *dev = in->my_dev;
2696 int retVal = -1;
2697
2698 if (!tags) {
2699 /* Passed a NULL, so use our own tags space */
2700 tags = &localTags;
2701 }
2702
2703 tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk);
2704
2705 if (tn) {
2706
2707 theChunk = yaffs_get_group_base(dev, tn, inode_chunk);
2708
2709 retVal =
2710 yaffs_find_chunk_in_group(dev, theChunk, tags, in->obj_id,
2711 inode_chunk);
2712
2713 /* Delete the entry in the filestructure (if found) */
2714 if (retVal != -1)
2715 yaffs_load_tnode_0(dev, tn, inode_chunk, 0);
2716 }
2717
2718 return retVal;
2719 }
2720
2721
2722 int yaffs_put_chunk_in_file(yaffs_obj_t *in, int inode_chunk,
2723 int nand_chunk, int in_scan)
2724 {
2725 /* NB in_scan is zero unless scanning.
2726 * For forward scanning, in_scan is > 0;
2727 * for backward scanning in_scan is < 0
2728 *
2729 * nand_chunk = 0 is a dummy insert to make sure the tnodes are there.
2730 */
2731
2732 yaffs_tnode_t *tn;
2733 yaffs_dev_t *dev = in->my_dev;
2734 int existingChunk;
2735 yaffs_ext_tags existingTags;
2736 yaffs_ext_tags newTags;
2737 unsigned existingSerial, newSerial;
2738
2739 if (in->variant_type != YAFFS_OBJECT_TYPE_FILE) {
2740 /* Just ignore an attempt at putting a chunk into a non-file during scanning
2741 * If it is not during Scanning then something went wrong!
2742 */
2743 if (!in_scan) {
2744 T(YAFFS_TRACE_ERROR,
2745 (TSTR
2746 ("yaffs tragedy:attempt to put data chunk into a non-file"
2747 TENDSTR)));
2748 YBUG();
2749 }
2750
2751 yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
2752 return YAFFS_OK;
2753 }
2754
2755 tn = yaffs_add_find_tnode_0(dev,
2756 &in->variant.file_variant,
2757 inode_chunk,
2758 NULL);
2759 if (!tn)
2760 return YAFFS_FAIL;
2761
2762 if(!nand_chunk)
2763 /* Dummy insert, bail now */
2764 return YAFFS_OK;
2765
2766 existingChunk = yaffs_get_group_base(dev, tn, inode_chunk);
2767
2768 if (in_scan != 0) {
2769 /* If we're scanning then we need to test for duplicates
2770 * NB This does not need to be efficient since it should only ever
2771 * happen when the power fails during a write, then only one
2772 * chunk should ever be affected.
2773 *
2774 * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO
2775 * Update: For backward scanning we don't need to re-read tags so this is quite cheap.
2776 */
2777
2778 if (existingChunk > 0) {
2779 /* NB Right now existing chunk will not be real chunk_id if the chunk group size > 1
2780 * thus we have to do a FindChunkInFile to get the real chunk id.
2781 *
2782 * We have a duplicate now we need to decide which one to use:
2783 *
2784 * Backwards scanning YAFFS2: The old one is what we use, dump the new one.
2785 * Forward scanning YAFFS2: The new one is what we use, dump the old one.
2786 * YAFFS1: Get both sets of tags and compare serial numbers.
2787 */
2788
2789 if (in_scan > 0) {
2790 /* Only do this for forward scanning */
2791 yaffs_rd_chunk_tags_nand(dev,
2792 nand_chunk,
2793 NULL, &newTags);
2794
2795 /* Do a proper find */
2796 existingChunk =
2797 yaffs_find_chunk_in_file(in, inode_chunk,
2798 &existingTags);
2799 }
2800
2801 if (existingChunk <= 0) {
2802 /*Hoosterman - how did this happen? */
2803
2804 T(YAFFS_TRACE_ERROR,
2805 (TSTR
2806 ("yaffs tragedy: existing chunk < 0 in scan"
2807 TENDSTR)));
2808
2809 }
2810
2811 /* NB The deleted flags should be false, otherwise the chunks will
2812 * not be loaded during a scan
2813 */
2814
2815 if (in_scan > 0) {
2816 newSerial = newTags.serial_number;
2817 existingSerial = existingTags.serial_number;
2818 }
2819
2820 if ((in_scan > 0) &&
2821 (existingChunk <= 0 ||
2822 ((existingSerial + 1) & 3) == newSerial)) {
2823 /* Forward scanning.
2824 * Use new
2825 * Delete the old one and drop through to update the tnode
2826 */
2827 yaffs_chunk_del(dev, existingChunk, 1,
2828 __LINE__);
2829 } else {
2830 /* Backward scanning or we want to use the existing one
2831 * Use existing.
2832 * Delete the new one and return early so that the tnode isn't changed
2833 */
2834 yaffs_chunk_del(dev, nand_chunk, 1,
2835 __LINE__);
2836 return YAFFS_OK;
2837 }
2838 }
2839
2840 }
2841
2842 if (existingChunk == 0)
2843 in->n_data_chunks++;
2844
2845 yaffs_load_tnode_0(dev, tn, inode_chunk, nand_chunk);
2846
2847 return YAFFS_OK;
2848 }
2849
2850 static int yaffs_rd_data_obj(yaffs_obj_t *in, int inode_chunk,
2851 __u8 *buffer)
2852 {
2853 int nand_chunk = yaffs_find_chunk_in_file(in, inode_chunk, NULL);
2854
2855 if (nand_chunk >= 0)
2856 return yaffs_rd_chunk_tags_nand(in->my_dev, nand_chunk,
2857 buffer, NULL);
2858 else {
2859 T(YAFFS_TRACE_NANDACCESS,
2860 (TSTR("Chunk %d not found zero instead" TENDSTR),
2861 nand_chunk));
2862 /* get sane (zero) data if you read a hole */
2863 memset(buffer, 0, in->my_dev->data_bytes_per_chunk);
2864 return 0;
2865 }
2866
2867 }
2868
2869 void yaffs_chunk_del(yaffs_dev_t *dev, int chunk_id, int mark_flash, int lyn)
2870 {
2871 int block;
2872 int page;
2873 yaffs_ext_tags tags;
2874 yaffs_block_info_t *bi;
2875
2876 if (chunk_id <= 0)
2877 return;
2878
2879 dev->n_deletions++;
2880 block = chunk_id / dev->param.chunks_per_block;
2881 page = chunk_id % dev->param.chunks_per_block;
2882
2883
2884 if (!yaffs_check_chunk_bit(dev, block, page))
2885 T(YAFFS_TRACE_VERIFY,
2886 (TSTR("Deleting invalid chunk %d"TENDSTR),
2887 chunk_id));
2888
2889 bi = yaffs_get_block_info(dev, block);
2890
2891 yaffs2_update_oldest_dirty_seq(dev, block, bi);
2892
2893 T(YAFFS_TRACE_DELETION,
2894 (TSTR("line %d delete of chunk %d" TENDSTR), lyn, chunk_id));
2895
2896 if (!dev->param.is_yaffs2 && mark_flash &&
2897 bi->block_state != YAFFS_BLOCK_STATE_COLLECTING) {
2898
2899 yaffs_init_tags(&tags);
2900
2901 tags.is_deleted = 1;
2902
2903 yaffs_wr_chunk_tags_nand(dev, chunk_id, NULL, &tags);
2904 yaffs_handle_chunk_update(dev, chunk_id, &tags);
2905 } else {
2906 dev->n_unmarked_deletions++;
2907 }
2908
2909 /* Pull out of the management area.
2910 * If the whole block became dirty, this will kick off an erasure.
2911 */
2912 if (bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING ||
2913 bi->block_state == YAFFS_BLOCK_STATE_FULL ||
2914 bi->block_state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
2915 bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) {
2916 dev->n_free_chunks++;
2917
2918 yaffs_clear_chunk_bit(dev, block, page);
2919
2920 bi->pages_in_use--;
2921
2922 if (bi->pages_in_use == 0 &&
2923 !bi->has_shrink_hdr &&
2924 bi->block_state != YAFFS_BLOCK_STATE_ALLOCATING &&
2925 bi->block_state != YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
2926 yaffs_block_became_dirty(dev, block);
2927 }
2928
2929 }
2930
2931 }
2932
2933 static int yaffs_wr_data_obj(yaffs_obj_t *in, int inode_chunk,
2934 const __u8 *buffer, int n_bytes,
2935 int useReserve)
2936 {
2937 /* Find old chunk Need to do this to get serial number
2938 * Write new one and patch into tree.
2939 * Invalidate old tags.
2940 */
2941
2942 int prevChunkId;
2943 yaffs_ext_tags prevTags;
2944
2945 int newChunkId;
2946 yaffs_ext_tags newTags;
2947
2948 yaffs_dev_t *dev = in->my_dev;
2949
2950 yaffs_check_gc(dev,0);
2951
2952 /* Get the previous chunk at this location in the file if it exists.
2953 * If it does not exist then put a zero into the tree. This creates
2954 * the tnode now, rather than later when it is harder to clean up.
2955 */
2956 prevChunkId = yaffs_find_chunk_in_file(in, inode_chunk, &prevTags);
2957 if(prevChunkId < 1 &&
2958 !yaffs_put_chunk_in_file(in, inode_chunk, 0, 0))
2959 return 0;
2960
2961 /* Set up new tags */
2962 yaffs_init_tags(&newTags);
2963
2964 newTags.chunk_id = inode_chunk;
2965 newTags.obj_id = in->obj_id;
2966 newTags.serial_number =
2967 (prevChunkId > 0) ? prevTags.serial_number + 1 : 1;
2968 newTags.n_bytes = n_bytes;
2969
2970 if (n_bytes < 1 || n_bytes > dev->param.total_bytes_per_chunk) {
2971 T(YAFFS_TRACE_ERROR,
2972 (TSTR("Writing %d bytes to chunk!!!!!!!!!" TENDSTR), n_bytes));
2973 YBUG();
2974 }
2975
2976
2977 newChunkId =
2978 yaffs_write_new_chunk(dev, buffer, &newTags,
2979 useReserve);
2980
2981 if (newChunkId > 0) {
2982 yaffs_put_chunk_in_file(in, inode_chunk, newChunkId, 0);
2983
2984 if (prevChunkId > 0)
2985 yaffs_chunk_del(dev, prevChunkId, 1, __LINE__);
2986
2987 yaffs_verify_file_sane(in);
2988 }
2989 return newChunkId;
2990
2991 }
2992
2993 /* UpdateObjectHeader updates the header on NAND for an object.
2994 * If name is not NULL, then that new name is used.
2995 */
2996 int yaffs_update_oh(yaffs_obj_t *in, const YCHAR *name, int force,
2997 int is_shrink, int shadows, yaffs_xattr_mod *xmod)
2998 {
2999
3000 yaffs_block_info_t *bi;
3001
3002 yaffs_dev_t *dev = in->my_dev;
3003
3004 int prevChunkId;
3005 int retVal = 0;
3006 int result = 0;
3007
3008 int newChunkId;
3009 yaffs_ext_tags newTags;
3010 yaffs_ext_tags oldTags;
3011 const YCHAR *alias = NULL;
3012
3013 __u8 *buffer = NULL;
3014 YCHAR old_name[YAFFS_MAX_NAME_LENGTH + 1];
3015
3016 yaffs_obj_header *oh = NULL;
3017
3018 yaffs_strcpy(old_name, _Y("silly old name"));
3019
3020
3021 if (!in->fake ||
3022 in == dev->root_dir || /* The root_dir should also be saved */
3023 force || xmod) {
3024
3025 yaffs_check_gc(dev,0);
3026 yaffs_check_obj_details_loaded(in);
3027
3028 buffer = yaffs_get_temp_buffer(in->my_dev, __LINE__);
3029 oh = (yaffs_obj_header *) buffer;
3030
3031 prevChunkId = in->hdr_chunk;
3032
3033 if (prevChunkId > 0) {
3034 result = yaffs_rd_chunk_tags_nand(dev, prevChunkId,
3035 buffer, &oldTags);
3036
3037 yaffs_verify_oh(in, oh, &oldTags, 0);
3038
3039 memcpy(old_name, oh->name, sizeof(oh->name));
3040 memset(buffer, 0xFF, sizeof(yaffs_obj_header));
3041 } else
3042 memset(buffer, 0xFF, dev->data_bytes_per_chunk);
3043
3044 oh->type = in->variant_type;
3045 oh->yst_mode = in->yst_mode;
3046 oh->shadows_obj = oh->inband_shadowed_obj_id = shadows;
3047
3048 #ifdef CONFIG_YAFFS_WINCE
3049 oh->win_atime[0] = in->win_atime[0];
3050 oh->win_ctime[0] = in->win_ctime[0];
3051 oh->win_mtime[0] = in->win_mtime[0];
3052 oh->win_atime[1] = in->win_atime[1];
3053 oh->win_ctime[1] = in->win_ctime[1];
3054 oh->win_mtime[1] = in->win_mtime[1];
3055 #else
3056 oh->yst_uid = in->yst_uid;
3057 oh->yst_gid = in->yst_gid;
3058 oh->yst_atime = in->yst_atime;
3059 oh->yst_mtime = in->yst_mtime;
3060 oh->yst_ctime = in->yst_ctime;
3061 oh->yst_rdev = in->yst_rdev;
3062 #endif
3063 if (in->parent)
3064 oh->parent_obj_id = in->parent->obj_id;
3065 else
3066 oh->parent_obj_id = 0;
3067
3068 if (name && *name) {
3069 memset(oh->name, 0, sizeof(oh->name));
3070 yaffs_load_oh_from_name(dev,oh->name,name);
3071 } else if (prevChunkId > 0)
3072 memcpy(oh->name, old_name, sizeof(oh->name));
3073 else
3074 memset(oh->name, 0, sizeof(oh->name));
3075
3076 oh->is_shrink = is_shrink;
3077
3078 switch (in->variant_type) {
3079 case YAFFS_OBJECT_TYPE_UNKNOWN:
3080 /* Should not happen */
3081 break;
3082 case YAFFS_OBJECT_TYPE_FILE:
3083 oh->file_size =
3084 (oh->parent_obj_id == YAFFS_OBJECTID_DELETED
3085 || oh->parent_obj_id ==
3086 YAFFS_OBJECTID_UNLINKED) ? 0 : in->variant.
3087 file_variant.file_size;
3088 break;
3089 case YAFFS_OBJECT_TYPE_HARDLINK:
3090 oh->equiv_id =
3091 in->variant.hardlink_variant.equiv_id;
3092 break;
3093 case YAFFS_OBJECT_TYPE_SPECIAL:
3094 /* Do nothing */
3095 break;
3096 case YAFFS_OBJECT_TYPE_DIRECTORY:
3097 /* Do nothing */
3098 break;
3099 case YAFFS_OBJECT_TYPE_SYMLINK:
3100 alias = in->variant.symlink_variant.alias;
3101 if(!alias)
3102 alias = _Y("no alias");
3103 yaffs_strncpy(oh->alias,
3104 alias,
3105 YAFFS_MAX_ALIAS_LENGTH);
3106 oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
3107 break;
3108 }
3109
3110 /* process any xattrib modifications */
3111 if(xmod)
3112 yaffs_apply_xattrib_mod(in, (char *)buffer, xmod);
3113
3114
3115 /* Tags */
3116 yaffs_init_tags(&newTags);
3117 in->serial++;
3118 newTags.chunk_id = 0;
3119 newTags.obj_id = in->obj_id;
3120 newTags.serial_number = in->serial;
3121
3122 /* Add extra info for file header */
3123
3124 newTags.extra_available = 1;
3125 newTags.extra_parent_id = oh->parent_obj_id;
3126 newTags.extra_length = oh->file_size;
3127 newTags.extra_is_shrink = oh->is_shrink;
3128 newTags.extra_equiv_id = oh->equiv_id;
3129 newTags.extra_shadows = (oh->shadows_obj > 0) ? 1 : 0;
3130 newTags.extra_obj_type = in->variant_type;
3131
3132 yaffs_verify_oh(in, oh, &newTags, 1);
3133
3134 /* Create new chunk in NAND */
3135 newChunkId =
3136 yaffs_write_new_chunk(dev, buffer, &newTags,
3137 (prevChunkId > 0) ? 1 : 0);
3138
3139 if (newChunkId >= 0) {
3140
3141 in->hdr_chunk = newChunkId;
3142
3143 if (prevChunkId > 0) {
3144 yaffs_chunk_del(dev, prevChunkId, 1,
3145 __LINE__);
3146 }
3147
3148 if (!yaffs_obj_cache_dirty(in))
3149 in->dirty = 0;
3150
3151 /* If this was a shrink, then mark the block that the chunk lives on */
3152 if (is_shrink) {
3153 bi = yaffs_get_block_info(in->my_dev,
3154 newChunkId / in->my_dev->param.chunks_per_block);
3155 bi->has_shrink_hdr = 1;
3156 }
3157
3158 }
3159
3160 retVal = newChunkId;
3161
3162 }
3163
3164 if (buffer)
3165 yaffs_release_temp_buffer(dev, buffer, __LINE__);
3166
3167 return retVal;
3168 }
3169
3170 /*------------------------ Short Operations Cache ----------------------------------------
3171 * In many situations where there is no high level buffering (eg WinCE) a lot of
3172 * reads might be short sequential reads, and a lot of writes may be short
3173 * sequential writes. eg. scanning/writing a jpeg file.
3174 * In these cases, a short read/write cache can provide a huge perfomance benefit
3175 * with dumb-as-a-rock code.
3176 * In Linux, the page cache provides read buffering aand the short op cache provides write
3177 * buffering.
3178 *
3179 * There are a limited number (~10) of cache chunks per device so that we don't
3180 * need a very intelligent search.
3181 */
3182
3183 static int yaffs_obj_cache_dirty(yaffs_obj_t *obj)
3184 {
3185 yaffs_dev_t *dev = obj->my_dev;
3186 int i;
3187 yaffs_cache_t *cache;
3188 int nCaches = obj->my_dev->param.n_caches;
3189
3190 for (i = 0; i < nCaches; i++) {
3191 cache = &dev->cache[i];
3192 if (cache->object == obj &&
3193 cache->dirty)
3194 return 1;
3195 }
3196
3197 return 0;
3198 }
3199
3200
3201 static void yaffs_flush_file_cache(yaffs_obj_t *obj)
3202 {
3203 yaffs_dev_t *dev = obj->my_dev;
3204 int lowest = -99; /* Stop compiler whining. */
3205 int i;
3206 yaffs_cache_t *cache;
3207 int chunkWritten = 0;
3208 int nCaches = obj->my_dev->param.n_caches;
3209
3210 if (nCaches > 0) {
3211 do {
3212 cache = NULL;
3213
3214 /* Find the dirty cache for this object with the lowest chunk id. */
3215 for (i = 0; i < nCaches; i++) {
3216 if (dev->cache[i].object == obj &&
3217 dev->cache[i].dirty) {
3218 if (!cache
3219 || dev->cache[i].chunk_id <
3220 lowest) {
3221 cache = &dev->cache[i];
3222 lowest = cache->chunk_id;
3223 }
3224 }
3225 }
3226
3227 if (cache && !cache->locked) {
3228 /* Write it out and free it up */
3229
3230 chunkWritten =
3231 yaffs_wr_data_obj(cache->object,
3232 cache->chunk_id,
3233 cache->data,
3234 cache->n_bytes,
3235 1);
3236 cache->dirty = 0;
3237 cache->object = NULL;
3238 }
3239
3240 } while (cache && chunkWritten > 0);
3241
3242 if (cache) {
3243 /* Hoosterman, disk full while writing cache out. */
3244 T(YAFFS_TRACE_ERROR,
3245 (TSTR("yaffs tragedy: no space during cache write" TENDSTR)));
3246
3247 }
3248 }
3249
3250 }
3251
3252 /*yaffs_flush_whole_cache(dev)
3253 *
3254 *
3255 */
3256
3257 void yaffs_flush_whole_cache(yaffs_dev_t *dev)
3258 {
3259 yaffs_obj_t *obj;
3260 int nCaches = dev->param.n_caches;
3261 int i;
3262
3263 /* Find a dirty object in the cache and flush it...
3264 * until there are no further dirty objects.
3265 */
3266 do {
3267 obj = NULL;
3268 for (i = 0; i < nCaches && !obj; i++) {
3269 if (dev->cache[i].object &&
3270 dev->cache[i].dirty)
3271 obj = dev->cache[i].object;
3272
3273 }
3274 if (obj)
3275 yaffs_flush_file_cache(obj);
3276
3277 } while (obj);
3278
3279 }
3280
3281
3282 /* Grab us a cache chunk for use.
3283 * First look for an empty one.
3284 * Then look for the least recently used non-dirty one.
3285 * Then look for the least recently used dirty one...., flush and look again.
3286 */
3287 static yaffs_cache_t *yaffs_grab_chunk_worker(yaffs_dev_t *dev)
3288 {
3289 int i;
3290
3291 if (dev->param.n_caches > 0) {
3292 for (i = 0; i < dev->param.n_caches; i++) {
3293 if (!dev->cache[i].object)
3294 return &dev->cache[i];
3295 }
3296 }
3297
3298 return NULL;
3299 }
3300
3301 static yaffs_cache_t *yaffs_grab_chunk_cache(yaffs_dev_t *dev)
3302 {
3303 yaffs_cache_t *cache;
3304 yaffs_obj_t *theObj;
3305 int usage;
3306 int i;
3307 int pushout;
3308
3309 if (dev->param.n_caches > 0) {
3310 /* Try find a non-dirty one... */
3311
3312 cache = yaffs_grab_chunk_worker(dev);
3313
3314 if (!cache) {
3315 /* They were all dirty, find the last recently used object and flush
3316 * its cache, then find again.
3317 * NB what's here is not very accurate, we actually flush the object
3318 * the last recently used page.
3319 */
3320
3321 /* With locking we can't assume we can use entry zero */
3322
3323 theObj = NULL;
3324 usage = -1;
3325 cache = NULL;
3326 pushout = -1;
3327
3328 for (i = 0; i < dev->param.n_caches; i++) {
3329 if (dev->cache[i].object &&
3330 !dev->cache[i].locked &&
3331 (dev->cache[i].last_use < usage || !cache)) {
3332 usage = dev->cache[i].last_use;
3333 theObj = dev->cache[i].object;
3334 cache = &dev->cache[i];
3335 pushout = i;
3336 }
3337 }
3338
3339 if (!cache || cache->dirty) {
3340 /* Flush and try again */
3341 yaffs_flush_file_cache(theObj);
3342 cache = yaffs_grab_chunk_worker(dev);
3343 }
3344
3345 }
3346 return cache;
3347 } else
3348 return NULL;
3349
3350 }
3351
3352 /* Find a cached chunk */
3353 static yaffs_cache_t *yaffs_find_chunk_cache(const yaffs_obj_t *obj,
3354 int chunk_id)
3355 {
3356 yaffs_dev_t *dev = obj->my_dev;
3357 int i;
3358 if (dev->param.n_caches > 0) {
3359 for (i = 0; i < dev->param.n_caches; i++) {
3360 if (dev->cache[i].object == obj &&
3361 dev->cache[i].chunk_id == chunk_id) {
3362 dev->cache_hits++;
3363
3364 return &dev->cache[i];
3365 }
3366 }
3367 }
3368 return NULL;
3369 }
3370
3371 /* Mark the chunk for the least recently used algorithym */
3372 static void yaffs_use_cache(yaffs_dev_t *dev, yaffs_cache_t *cache,
3373 int isAWrite)
3374 {
3375
3376 if (dev->param.n_caches > 0) {
3377 if (dev->cache_last_use < 0 || dev->cache_last_use > 100000000) {
3378 /* Reset the cache usages */
3379 int i;
3380 for (i = 1; i < dev->param.n_caches; i++)
3381 dev->cache[i].last_use = 0;
3382
3383 dev->cache_last_use = 0;
3384 }
3385
3386 dev->cache_last_use++;
3387
3388 cache->last_use = dev->cache_last_use;
3389
3390 if (isAWrite)
3391 cache->dirty = 1;
3392 }
3393 }
3394
3395 /* Invalidate a single cache page.
3396 * Do this when a whole page gets written,
3397 * ie the short cache for this page is no longer valid.
3398 */
3399 static void yaffs_invalidate_chunk_cache(yaffs_obj_t *object, int chunk_id)
3400 {
3401 if (object->my_dev->param.n_caches > 0) {
3402 yaffs_cache_t *cache = yaffs_find_chunk_cache(object, chunk_id);
3403
3404 if (cache)
3405 cache->object = NULL;
3406 }
3407 }
3408
3409 /* Invalidate all the cache pages associated with this object
3410 * Do this whenever ther file is deleted or resized.
3411 */
3412 static void yaffs_invalidate_whole_cache(yaffs_obj_t *in)
3413 {
3414 int i;
3415 yaffs_dev_t *dev = in->my_dev;
3416
3417 if (dev->param.n_caches > 0) {
3418 /* Invalidate it. */
3419 for (i = 0; i < dev->param.n_caches; i++) {
3420 if (dev->cache[i].object == in)
3421 dev->cache[i].object = NULL;
3422 }
3423 }
3424 }
3425
3426
3427 /*--------------------- File read/write ------------------------
3428 * Read and write have very similar structures.
3429 * In general the read/write has three parts to it
3430 * An incomplete chunk to start with (if the read/write is not chunk-aligned)
3431 * Some complete chunks
3432 * An incomplete chunk to end off with
3433 *
3434 * Curve-balls: the first chunk might also be the last chunk.
3435 */
3436
3437 int yaffs_file_rd(yaffs_obj_t *in, __u8 *buffer, loff_t offset,
3438 int n_bytes)
3439 {
3440
3441 int chunk;
3442 __u32 start;
3443 int nToCopy;
3444 int n = n_bytes;
3445 int nDone = 0;
3446 yaffs_cache_t *cache;
3447
3448 yaffs_dev_t *dev;
3449
3450 dev = in->my_dev;
3451
3452 while (n > 0) {
3453 /* chunk = offset / dev->data_bytes_per_chunk + 1; */
3454 /* start = offset % dev->data_bytes_per_chunk; */
3455 yaffs_addr_to_chunk(dev, offset, &chunk, &start);
3456 chunk++;
3457
3458 /* OK now check for the curveball where the start and end are in
3459 * the same chunk.
3460 */
3461 if ((start + n) < dev->data_bytes_per_chunk)
3462 nToCopy = n;
3463 else
3464 nToCopy = dev->data_bytes_per_chunk - start;
3465
3466 cache = yaffs_find_chunk_cache(in, chunk);
3467
3468 /* If the chunk is already in the cache or it is less than a whole chunk
3469 * or we're using inband tags then use the cache (if there is caching)
3470 * else bypass the cache.
3471 */
3472 if (cache || nToCopy != dev->data_bytes_per_chunk || dev->param.inband_tags) {
3473 if (dev->param.n_caches > 0) {
3474
3475 /* If we can't find the data in the cache, then load it up. */
3476
3477 if (!cache) {
3478 cache = yaffs_grab_chunk_cache(in->my_dev);
3479 cache->object = in;
3480 cache->chunk_id = chunk;
3481 cache->dirty = 0;
3482 cache->locked = 0;
3483 yaffs_rd_data_obj(in, chunk,
3484 cache->
3485 data);
3486 cache->n_bytes = 0;
3487 }
3488
3489 yaffs_use_cache(dev, cache, 0);
3490
3491 cache->locked = 1;
3492
3493
3494 memcpy(buffer, &cache->data[start], nToCopy);
3495
3496 cache->locked = 0;
3497 } else {
3498 /* Read into the local buffer then copy..*/
3499
3500 __u8 *localBuffer =
3501 yaffs_get_temp_buffer(dev, __LINE__);
3502 yaffs_rd_data_obj(in, chunk,
3503 localBuffer);
3504
3505 memcpy(buffer, &localBuffer[start], nToCopy);
3506
3507
3508 yaffs_release_temp_buffer(dev, localBuffer,
3509 __LINE__);
3510 }
3511
3512 } else {
3513
3514 /* A full chunk. Read directly into the supplied buffer. */
3515 yaffs_rd_data_obj(in, chunk, buffer);
3516
3517 }
3518
3519 n -= nToCopy;
3520 offset += nToCopy;
3521 buffer += nToCopy;
3522 nDone += nToCopy;
3523
3524 }
3525
3526 return nDone;
3527 }
3528
3529 int yaffs_do_file_wr(yaffs_obj_t *in, const __u8 *buffer, loff_t offset,
3530 int n_bytes, int write_trhrough)
3531 {
3532
3533 int chunk;
3534 __u32 start;
3535 int nToCopy;
3536 int n = n_bytes;
3537 int nDone = 0;
3538 int nToWriteBack;
3539 int startOfWrite = offset;
3540 int chunkWritten = 0;
3541 __u32 n_bytesRead;
3542 __u32 chunkStart;
3543
3544 yaffs_dev_t *dev;
3545
3546 dev = in->my_dev;
3547
3548 while (n > 0 && chunkWritten >= 0) {
3549 yaffs_addr_to_chunk(dev, offset, &chunk, &start);
3550
3551 if (chunk * dev->data_bytes_per_chunk + start != offset ||
3552 start >= dev->data_bytes_per_chunk) {
3553 T(YAFFS_TRACE_ERROR, (
3554 TSTR("AddrToChunk of offset %d gives chunk %d start %d"
3555 TENDSTR),
3556 (int)offset, chunk, start));
3557 }
3558 chunk++; /* File pos to chunk in file offset */
3559
3560 /* OK now check for the curveball where the start and end are in
3561 * the same chunk.
3562 */
3563
3564 if ((start + n) < dev->data_bytes_per_chunk) {
3565 nToCopy = n;
3566
3567 /* Now folks, to calculate how many bytes to write back....
3568 * If we're overwriting and not writing to then end of file then
3569 * we need to write back as much as was there before.
3570 */
3571
3572 chunkStart = ((chunk - 1) * dev->data_bytes_per_chunk);
3573
3574 if (chunkStart > in->variant.file_variant.file_size)
3575 n_bytesRead = 0; /* Past end of file */
3576 else
3577 n_bytesRead = in->variant.file_variant.file_size - chunkStart;
3578
3579 if (n_bytesRead > dev->data_bytes_per_chunk)
3580 n_bytesRead = dev->data_bytes_per_chunk;
3581
3582 nToWriteBack =
3583 (n_bytesRead >
3584 (start + n)) ? n_bytesRead : (start + n);
3585
3586 if (nToWriteBack < 0 || nToWriteBack > dev->data_bytes_per_chunk)
3587 YBUG();
3588
3589 } else {
3590 nToCopy = dev->data_bytes_per_chunk - start;
3591 nToWriteBack = dev->data_bytes_per_chunk;
3592 }
3593
3594 if (nToCopy != dev->data_bytes_per_chunk || dev->param.inband_tags) {
3595 /* An incomplete start or end chunk (or maybe both start and end chunk),
3596 * or we're using inband tags, so we want to use the cache buffers.
3597 */
3598 if (dev->param.n_caches > 0) {
3599 yaffs_cache_t *cache;
3600 /* If we can't find the data in the cache, then load the cache */
3601 cache = yaffs_find_chunk_cache(in, chunk);
3602
3603 if (!cache
3604 && yaffs_check_alloc_available(dev, 1)) {
3605 cache = yaffs_grab_chunk_cache(dev);
3606 cache->object = in;
3607 cache->chunk_id = chunk;
3608 cache->dirty = 0;
3609 cache->locked = 0;
3610 yaffs_rd_data_obj(in, chunk,
3611 cache->data);
3612 } else if (cache &&
3613 !cache->dirty &&
3614 !yaffs_check_alloc_available(dev, 1)) {
3615 /* Drop the cache if it was a read cache item and
3616 * no space check has been made for it.
3617 */
3618 cache = NULL;
3619 }
3620
3621 if (cache) {
3622 yaffs_use_cache(dev, cache, 1);
3623 cache->locked = 1;
3624
3625
3626 memcpy(&cache->data[start], buffer,
3627 nToCopy);
3628
3629
3630 cache->locked = 0;
3631 cache->n_bytes = nToWriteBack;
3632
3633 if (write_trhrough) {
3634 chunkWritten =
3635 yaffs_wr_data_obj
3636 (cache->object,
3637 cache->chunk_id,
3638 cache->data, cache->n_bytes,
3639 1);
3640 cache->dirty = 0;
3641 }
3642
3643 } else {
3644 chunkWritten = -1; /* fail the write */
3645 }
3646 } else {
3647 /* An incomplete start or end chunk (or maybe both start and end chunk)
3648 * Read into the local buffer then copy, then copy over and write back.
3649 */
3650
3651 __u8 *localBuffer =
3652 yaffs_get_temp_buffer(dev, __LINE__);
3653
3654 yaffs_rd_data_obj(in, chunk,
3655 localBuffer);
3656
3657
3658
3659 memcpy(&localBuffer[start], buffer, nToCopy);
3660
3661 chunkWritten =
3662 yaffs_wr_data_obj(in, chunk,
3663 localBuffer,
3664 nToWriteBack,
3665 0);
3666
3667 yaffs_release_temp_buffer(dev, localBuffer,
3668 __LINE__);
3669
3670 }
3671
3672 } else {
3673 /* A full chunk. Write directly from the supplied buffer. */
3674
3675
3676
3677 chunkWritten =
3678 yaffs_wr_data_obj(in, chunk, buffer,
3679 dev->data_bytes_per_chunk,
3680 0);
3681
3682 /* Since we've overwritten the cached data, we better invalidate it. */
3683 yaffs_invalidate_chunk_cache(in, chunk);
3684 }
3685
3686 if (chunkWritten >= 0) {
3687 n -= nToCopy;
3688 offset += nToCopy;
3689 buffer += nToCopy;
3690 nDone += nToCopy;
3691 }
3692
3693 }
3694
3695 /* Update file object */
3696
3697 if ((startOfWrite + nDone) > in->variant.file_variant.file_size)
3698 in->variant.file_variant.file_size = (startOfWrite + nDone);
3699
3700 in->dirty = 1;
3701
3702 return nDone;
3703 }
3704
3705 int yaffs_wr_file(yaffs_obj_t *in, const __u8 *buffer, loff_t offset,
3706 int n_bytes, int write_trhrough)
3707 {
3708 yaffs2_handle_hole(in,offset);
3709 return yaffs_do_file_wr(in,buffer,offset,n_bytes,write_trhrough);
3710 }
3711
3712
3713
3714 /* ---------------------- File resizing stuff ------------------ */
3715
3716 static void yaffs_prune_chunks(yaffs_obj_t *in, int new_size)
3717 {
3718
3719 yaffs_dev_t *dev = in->my_dev;
3720 int oldFileSize = in->variant.file_variant.file_size;
3721
3722 int lastDel = 1 + (oldFileSize - 1) / dev->data_bytes_per_chunk;
3723
3724 int startDel = 1 + (new_size + dev->data_bytes_per_chunk - 1) /
3725 dev->data_bytes_per_chunk;
3726 int i;
3727 int chunk_id;
3728
3729 /* Delete backwards so that we don't end up with holes if
3730 * power is lost part-way through the operation.
3731 */
3732 for (i = lastDel; i >= startDel; i--) {
3733 /* NB this could be optimised somewhat,
3734 * eg. could retrieve the tags and write them without
3735 * using yaffs_chunk_del
3736 */
3737
3738 chunk_id = yaffs_find_del_file_chunk(in, i, NULL);
3739 if (chunk_id > 0) {
3740 if (chunk_id <
3741 (dev->internal_start_block * dev->param.chunks_per_block)
3742 || chunk_id >=
3743 ((dev->internal_end_block +
3744 1) * dev->param.chunks_per_block)) {
3745 T(YAFFS_TRACE_ALWAYS,
3746 (TSTR("Found daft chunk_id %d for %d" TENDSTR),
3747 chunk_id, i));
3748 } else {
3749 in->n_data_chunks--;
3750 yaffs_chunk_del(dev, chunk_id, 1, __LINE__);
3751 }
3752 }
3753 }
3754
3755 }
3756
3757
3758 void yaffs_resize_file_down( yaffs_obj_t *obj, loff_t new_size)
3759 {
3760 int newFullChunks;
3761 __u32 new_sizeOfPartialChunk;
3762 yaffs_dev_t *dev = obj->my_dev;
3763
3764 yaffs_addr_to_chunk(dev, new_size, &newFullChunks, &new_sizeOfPartialChunk);
3765
3766 yaffs_prune_chunks(obj, new_size);
3767
3768 if (new_sizeOfPartialChunk != 0) {
3769 int lastChunk = 1 + newFullChunks;
3770 __u8 *localBuffer = yaffs_get_temp_buffer(dev, __LINE__);
3771
3772 /* Got to read and rewrite the last chunk with its new size and zero pad */
3773 yaffs_rd_data_obj(obj, lastChunk, localBuffer);
3774 memset(localBuffer + new_sizeOfPartialChunk, 0,
3775 dev->data_bytes_per_chunk - new_sizeOfPartialChunk);
3776
3777 yaffs_wr_data_obj(obj, lastChunk, localBuffer,
3778 new_sizeOfPartialChunk, 1);
3779
3780 yaffs_release_temp_buffer(dev, localBuffer, __LINE__);
3781 }
3782
3783 obj->variant.file_variant.file_size = new_size;
3784
3785 yaffs_prune_tree(dev, &obj->variant.file_variant);
3786 }
3787
3788
3789 int yaffs_resize_file(yaffs_obj_t *in, loff_t new_size)
3790 {
3791 yaffs_dev_t *dev = in->my_dev;
3792 int oldFileSize = in->variant.file_variant.file_size;
3793
3794 yaffs_flush_file_cache(in);
3795 yaffs_invalidate_whole_cache(in);
3796
3797 yaffs_check_gc(dev,0);
3798
3799 if (in->variant_type != YAFFS_OBJECT_TYPE_FILE)
3800 return YAFFS_FAIL;
3801
3802 if (new_size == oldFileSize)
3803 return YAFFS_OK;
3804
3805 if(new_size > oldFileSize){
3806 yaffs2_handle_hole(in,new_size);
3807 in->variant.file_variant.file_size = new_size;
3808 } else {
3809 /* new_size < oldFileSize */
3810 yaffs_resize_file_down(in, new_size);
3811 }
3812
3813 /* Write a new object header to reflect the resize.
3814 * show we've shrunk the file, if need be
3815 * Do this only if the file is not in the deleted directories
3816 * and is not shadowed.
3817 */
3818 if (in->parent &&
3819 !in->is_shadowed &&
3820 in->parent->obj_id != YAFFS_OBJECTID_UNLINKED &&
3821 in->parent->obj_id != YAFFS_OBJECTID_DELETED)
3822 yaffs_update_oh(in, NULL, 0, 0, 0, NULL);
3823
3824
3825 return YAFFS_OK;
3826 }
3827
3828 loff_t yaffs_get_file_size(yaffs_obj_t *obj)
3829 {
3830 YCHAR *alias = NULL;
3831 obj = yaffs_get_equivalent_obj(obj);
3832
3833 switch (obj->variant_type) {
3834 case YAFFS_OBJECT_TYPE_FILE:
3835 return obj->variant.file_variant.file_size;
3836 case YAFFS_OBJECT_TYPE_SYMLINK:
3837 alias = obj->variant.symlink_variant.alias;
3838 if(!alias)
3839 return 0;
3840 return yaffs_strnlen(alias,YAFFS_MAX_ALIAS_LENGTH);
3841 default:
3842 return 0;
3843 }
3844 }
3845
3846
3847
3848 int yaffs_flush_file(yaffs_obj_t *in, int update_time, int data_sync)
3849 {
3850 int retVal;
3851 if (in->dirty) {
3852 yaffs_flush_file_cache(in);
3853 if(data_sync) /* Only sync data */
3854 retVal=YAFFS_OK;
3855 else {
3856 if (update_time) {
3857 #ifdef CONFIG_YAFFS_WINCE
3858 yfsd_win_file_time_now(in->win_mtime);
3859 #else
3860
3861 in->yst_mtime = Y_CURRENT_TIME;
3862
3863 #endif
3864 }
3865
3866 retVal = (yaffs_update_oh(in, NULL, 0, 0, 0, NULL) >=
3867 0) ? YAFFS_OK : YAFFS_FAIL;
3868 }
3869 } else {
3870 retVal = YAFFS_OK;
3871 }
3872
3873 return retVal;
3874
3875 }
3876
3877 static int yaffs_generic_obj_del(yaffs_obj_t *in)
3878 {
3879
3880 /* First off, invalidate the file's data in the cache, without flushing. */
3881 yaffs_invalidate_whole_cache(in);
3882
3883 if (in->my_dev->param.is_yaffs2 && (in->parent != in->my_dev->del_dir)) {
3884 /* Move to the unlinked directory so we have a record that it was deleted. */
3885 yaffs_change_obj_name(in, in->my_dev->del_dir, _Y("deleted"), 0, 0);
3886
3887 }
3888
3889 yaffs_remove_obj_from_dir(in);
3890 yaffs_chunk_del(in->my_dev, in->hdr_chunk, 1, __LINE__);
3891 in->hdr_chunk = 0;
3892
3893 yaffs_free_obj(in);
3894 return YAFFS_OK;
3895
3896 }
3897
3898 /* yaffs_del_file deletes the whole file data
3899 * and the inode associated with the file.
3900 * It does not delete the links associated with the file.
3901 */
3902 static int yaffs_unlink_file_if_needed(yaffs_obj_t *in)
3903 {
3904
3905 int retVal;
3906 int immediateDeletion = 0;
3907 yaffs_dev_t *dev = in->my_dev;
3908
3909 if (!in->my_inode)
3910 immediateDeletion = 1;
3911
3912 if (immediateDeletion) {
3913 retVal =
3914 yaffs_change_obj_name(in, in->my_dev->del_dir,
3915 _Y("deleted"), 0, 0);
3916 T(YAFFS_TRACE_TRACING,
3917 (TSTR("yaffs: immediate deletion of file %d" TENDSTR),
3918 in->obj_id));
3919 in->deleted = 1;
3920 in->my_dev->n_deleted_files++;
3921 if (dev->param.disable_soft_del || dev->param.is_yaffs2)
3922 yaffs_resize_file(in, 0);
3923 yaffs_soft_del_file(in);
3924 } else {
3925 retVal =
3926 yaffs_change_obj_name(in, in->my_dev->unlinked_dir,
3927 _Y("unlinked"), 0, 0);
3928 }
3929
3930
3931 return retVal;
3932 }
3933
3934 int yaffs_del_file(yaffs_obj_t *in)
3935 {
3936 int retVal = YAFFS_OK;
3937 int deleted; /* Need to cache value on stack if in is freed */
3938 yaffs_dev_t *dev = in->my_dev;
3939
3940 if (dev->param.disable_soft_del || dev->param.is_yaffs2)
3941 yaffs_resize_file(in, 0);
3942
3943 if (in->n_data_chunks > 0) {
3944 /* Use soft deletion if there is data in the file.
3945 * That won't be the case if it has been resized to zero.
3946 */
3947 if (!in->unlinked)
3948 retVal = yaffs_unlink_file_if_needed(in);
3949
3950 deleted = in->deleted;
3951
3952 if (retVal == YAFFS_OK && in->unlinked && !in->deleted) {
3953 in->deleted = 1;
3954 deleted = 1;
3955 in->my_dev->n_deleted_files++;
3956 yaffs_soft_del_file(in);
3957 }
3958 return deleted ? YAFFS_OK : YAFFS_FAIL;
3959 } else {
3960 /* The file has no data chunks so we toss it immediately */
3961 yaffs_free_tnode(in->my_dev, in->variant.file_variant.top);
3962 in->variant.file_variant.top = NULL;
3963 yaffs_generic_obj_del(in);
3964
3965 return YAFFS_OK;
3966 }
3967 }
3968
3969 static int yaffs_is_non_empty_dir(yaffs_obj_t *obj)
3970 {
3971 return (obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) &&
3972 !(ylist_empty(&obj->variant.dir_variant.children));
3973 }
3974
3975 static int yaffs_del_dir(yaffs_obj_t *obj)
3976 {
3977 /* First check that the directory is empty. */
3978 if (yaffs_is_non_empty_dir(obj))
3979 return YAFFS_FAIL;
3980
3981 return yaffs_generic_obj_del(obj);
3982 }
3983
3984 static int yaffs_del_symlink(yaffs_obj_t *in)
3985 {
3986 if(in->variant.symlink_variant.alias)
3987 YFREE(in->variant.symlink_variant.alias);
3988 in->variant.symlink_variant.alias=NULL;
3989
3990 return yaffs_generic_obj_del(in);
3991 }
3992
3993 static int yaffs_del_link(yaffs_obj_t *in)
3994 {
3995 /* remove this hardlink from the list assocaited with the equivalent
3996 * object
3997 */
3998 ylist_del_init(&in->hard_links);
3999 return yaffs_generic_obj_del(in);
4000 }
4001
4002 int yaffs_del_obj(yaffs_obj_t *obj)
4003 {
4004 int retVal = -1;
4005 switch (obj->variant_type) {
4006 case YAFFS_OBJECT_TYPE_FILE:
4007 retVal = yaffs_del_file(obj);
4008 break;
4009 case YAFFS_OBJECT_TYPE_DIRECTORY:
4010 if(!ylist_empty(&obj->variant.dir_variant.dirty)){
4011 T(YAFFS_TRACE_BACKGROUND, (TSTR("Remove object %d from dirty directories" TENDSTR),obj->obj_id));
4012 ylist_del_init(&obj->variant.dir_variant.dirty);
4013 }
4014 return yaffs_del_dir(obj);
4015 break;
4016 case YAFFS_OBJECT_TYPE_SYMLINK:
4017 retVal = yaffs_del_symlink(obj);
4018 break;
4019 case YAFFS_OBJECT_TYPE_HARDLINK:
4020 retVal = yaffs_del_link(obj);
4021 break;
4022 case YAFFS_OBJECT_TYPE_SPECIAL:
4023 retVal = yaffs_generic_obj_del(obj);
4024 break;
4025 case YAFFS_OBJECT_TYPE_UNKNOWN:
4026 retVal = 0;
4027 break; /* should not happen. */
4028 }
4029
4030 return retVal;
4031 }
4032
4033 static int yaffs_unlink_worker(yaffs_obj_t *obj)
4034 {
4035
4036 int immediateDeletion = 0;
4037
4038 if (!obj->my_inode)
4039 immediateDeletion = 1;
4040
4041 if(obj)
4042 yaffs_update_parent(obj->parent);
4043
4044 if (obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) {
4045 return yaffs_del_link(obj);
4046 } else if (!ylist_empty(&obj->hard_links)) {
4047 /* Curve ball: We're unlinking an object that has a hardlink.
4048 *
4049 * This problem arises because we are not strictly following
4050 * The Linux link/inode model.
4051 *
4052 * We can't really delete the object.
4053 * Instead, we do the following:
4054 * - Select a hardlink.
4055 * - Unhook it from the hard links
4056 * - Move it from its parent directory (so that the rename can work)
4057 * - Rename the object to the hardlink's name.
4058 * - Delete the hardlink
4059 */
4060
4061 yaffs_obj_t *hl;
4062 yaffs_obj_t *parent;
4063 int retVal;
4064 YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
4065
4066 hl = ylist_entry(obj->hard_links.next, yaffs_obj_t, hard_links);
4067
4068 yaffs_get_obj_name(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
4069 parent = hl->parent;
4070
4071 ylist_del_init(&hl->hard_links);
4072
4073 yaffs_add_obj_to_dir(obj->my_dev->unlinked_dir, hl);
4074
4075 retVal = yaffs_change_obj_name(obj,parent, name, 0, 0);
4076
4077 if (retVal == YAFFS_OK)
4078 retVal = yaffs_generic_obj_del(hl);
4079
4080 return retVal;
4081
4082 } else if (immediateDeletion) {
4083 switch (obj->variant_type) {
4084 case YAFFS_OBJECT_TYPE_FILE:
4085 return yaffs_del_file(obj);
4086 break;
4087 case YAFFS_OBJECT_TYPE_DIRECTORY:
4088 ylist_del_init(&obj->variant.dir_variant.dirty);
4089 return yaffs_del_dir(obj);
4090 break;
4091 case YAFFS_OBJECT_TYPE_SYMLINK:
4092 return yaffs_del_symlink(obj);
4093 break;
4094 case YAFFS_OBJECT_TYPE_SPECIAL:
4095 return yaffs_generic_obj_del(obj);
4096 break;
4097 case YAFFS_OBJECT_TYPE_HARDLINK:
4098 case YAFFS_OBJECT_TYPE_UNKNOWN:
4099 default:
4100 return YAFFS_FAIL;
4101 }
4102 } else if(yaffs_is_non_empty_dir(obj))
4103 return YAFFS_FAIL;
4104 else
4105 return yaffs_change_obj_name(obj, obj->my_dev->unlinked_dir,
4106 _Y("unlinked"), 0, 0);
4107 }
4108
4109
4110 static int yaffs_unlink_obj(yaffs_obj_t *obj)
4111 {
4112
4113 if (obj && obj->unlink_allowed)
4114 return yaffs_unlink_worker(obj);
4115
4116 return YAFFS_FAIL;
4117
4118 }
4119 int yaffs_unlinker(yaffs_obj_t *dir, const YCHAR *name)
4120 {
4121 yaffs_obj_t *obj;
4122
4123 obj = yaffs_find_by_name(dir, name);
4124 return yaffs_unlink_obj(obj);
4125 }
4126
4127 /*----------------------- Initialisation Scanning ---------------------- */
4128
4129 void yaffs_handle_shadowed_obj(yaffs_dev_t *dev, int obj_id,
4130 int backward_scanning)
4131 {
4132 yaffs_obj_t *obj;
4133
4134 if (!backward_scanning) {
4135 /* Handle YAFFS1 forward scanning case
4136 * For YAFFS1 we always do the deletion
4137 */
4138
4139 } else {
4140 /* Handle YAFFS2 case (backward scanning)
4141 * If the shadowed object exists then ignore.
4142 */
4143 obj = yaffs_find_by_number(dev, obj_id);
4144 if(obj)
4145 return;
4146 }
4147
4148 /* Let's create it (if it does not exist) assuming it is a file so that it can do shrinking etc.
4149 * We put it in unlinked dir to be cleaned up after the scanning
4150 */
4151 obj =
4152 yaffs_find_or_create_by_number(dev, obj_id,
4153 YAFFS_OBJECT_TYPE_FILE);
4154 if (!obj)
4155 return;
4156 obj->is_shadowed = 1;
4157 yaffs_add_obj_to_dir(dev->unlinked_dir, obj);
4158 obj->variant.file_variant.shrink_size = 0;
4159 obj->valid = 1; /* So that we don't read any other info for this file */
4160
4161 }
4162
4163
4164 void yaffs_link_fixup(yaffs_dev_t *dev, yaffs_obj_t *hard_list)
4165 {
4166 yaffs_obj_t *hl;
4167 yaffs_obj_t *in;
4168
4169 while (hard_list) {
4170 hl = hard_list;
4171 hard_list = (yaffs_obj_t *) (hard_list->hard_links.next);
4172
4173 in = yaffs_find_by_number(dev,
4174 hl->variant.hardlink_variant.
4175 equiv_id);
4176
4177 if (in) {
4178 /* Add the hardlink pointers */
4179 hl->variant.hardlink_variant.equiv_obj = in;
4180 ylist_add(&hl->hard_links, &in->hard_links);
4181 } else {
4182 /* Todo Need to report/handle this better.
4183 * Got a problem... hardlink to a non-existant object
4184 */
4185 hl->variant.hardlink_variant.equiv_obj = NULL;
4186 YINIT_LIST_HEAD(&hl->hard_links);
4187
4188 }
4189 }
4190 }
4191
4192
4193 static void yaffs_strip_deleted_objs(yaffs_dev_t *dev)
4194 {
4195 /*
4196 * Sort out state of unlinked and deleted objects after scanning.
4197 */
4198 struct ylist_head *i;
4199 struct ylist_head *n;
4200 yaffs_obj_t *l;
4201
4202 if (dev->read_only)
4203 return;
4204
4205 /* Soft delete all the unlinked files */
4206 ylist_for_each_safe(i, n,
4207 &dev->unlinked_dir->variant.dir_variant.children) {
4208 if (i) {
4209 l = ylist_entry(i, yaffs_obj_t, siblings);
4210 yaffs_del_obj(l);
4211 }
4212 }
4213
4214 ylist_for_each_safe(i, n,
4215 &dev->del_dir->variant.dir_variant.children) {
4216 if (i) {
4217 l = ylist_entry(i, yaffs_obj_t, siblings);
4218 yaffs_del_obj(l);
4219 }
4220 }
4221
4222 }
4223
4224 /*
4225 * This code iterates through all the objects making sure that they are rooted.
4226 * Any unrooted objects are re-rooted in lost+found.
4227 * An object needs to be in one of:
4228 * - Directly under deleted, unlinked
4229 * - Directly or indirectly under root.
4230 *
4231 * Note:
4232 * This code assumes that we don't ever change the current relationships between
4233 * directories:
4234 * root_dir->parent == unlinked_dir->parent == del_dir->parent == NULL
4235 * lostNfound->parent == root_dir
4236 *
4237 * This fixes the problem where directories might have inadvertently been deleted
4238 * leaving the object "hanging" without being rooted in the directory tree.
4239 */
4240
4241 static int yaffs_has_null_parent(yaffs_dev_t *dev, yaffs_obj_t *obj)
4242 {
4243 return (obj == dev->del_dir ||
4244 obj == dev->unlinked_dir||
4245 obj == dev->root_dir);
4246 }
4247
4248 static void yaffs_fix_hanging_objs(yaffs_dev_t *dev)
4249 {
4250 yaffs_obj_t *obj;
4251 yaffs_obj_t *parent;
4252 int i;
4253 struct ylist_head *lh;
4254 struct ylist_head *n;
4255 int depthLimit;
4256 int hanging;
4257
4258 if (dev->read_only)
4259 return;
4260
4261 /* Iterate through the objects in each hash entry,
4262 * looking at each object.
4263 * Make sure it is rooted.
4264 */
4265
4266 for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
4267 ylist_for_each_safe(lh, n, &dev->obj_bucket[i].list) {
4268 if (lh) {
4269 obj = ylist_entry(lh, yaffs_obj_t, hash_link);
4270 parent= obj->parent;
4271
4272 if(yaffs_has_null_parent(dev,obj)){
4273 /* These directories are not hanging */
4274 hanging = 0;
4275 }
4276 else if(!parent || parent->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
4277 hanging = 1;
4278 else if(yaffs_has_null_parent(dev,parent))
4279 hanging = 0;
4280 else {
4281 /*
4282 * Need to follow the parent chain to see if it is hanging.
4283 */
4284 hanging = 0;
4285 depthLimit=100;
4286
4287 while(parent != dev->root_dir &&
4288 parent->parent &&
4289 parent->parent->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY &&
4290 depthLimit > 0){
4291 parent = parent->parent;
4292 depthLimit--;
4293 }
4294 if(parent != dev->root_dir)
4295 hanging = 1;
4296 }
4297 if(hanging){
4298 T(YAFFS_TRACE_SCAN,
4299 (TSTR("Hanging object %d moved to lost and found" TENDSTR),
4300 obj->obj_id));
4301 yaffs_add_obj_to_dir(dev->lost_n_found,obj);
4302 }
4303 }
4304 }
4305 }
4306 }
4307
4308
4309 /*
4310 * Delete directory contents for cleaning up lost and found.
4311 */
4312 static void yaffs_del_dir_contents(yaffs_obj_t *dir)
4313 {
4314 yaffs_obj_t *obj;
4315 struct ylist_head *lh;
4316 struct ylist_head *n;
4317
4318 if(dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
4319 YBUG();
4320
4321 ylist_for_each_safe(lh, n, &dir->variant.dir_variant.children) {
4322 if (lh) {
4323 obj = ylist_entry(lh, yaffs_obj_t, siblings);
4324 if(obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY)
4325 yaffs_del_dir_contents(obj);
4326
4327 T(YAFFS_TRACE_SCAN,
4328 (TSTR("Deleting lost_found object %d" TENDSTR),
4329 obj->obj_id));
4330
4331 /* Need to use UnlinkObject since Delete would not handle
4332 * hardlinked objects correctly.
4333 */
4334 yaffs_unlink_obj(obj);
4335 }
4336 }
4337
4338 }
4339
4340 static void yaffs_empty_l_n_f(yaffs_dev_t *dev)
4341 {
4342 yaffs_del_dir_contents(dev->lost_n_found);
4343 }
4344
4345 static void yaffs_check_obj_details_loaded(yaffs_obj_t *in)
4346 {
4347 __u8 *chunkData;
4348 yaffs_obj_header *oh;
4349 yaffs_dev_t *dev;
4350 yaffs_ext_tags tags;
4351 int result;
4352 int alloc_failed = 0;
4353
4354 if (!in)
4355 return;
4356
4357 dev = in->my_dev;
4358
4359 #if 0
4360 T(YAFFS_TRACE_SCAN, (TSTR("details for object %d %s loaded" TENDSTR),
4361 in->obj_id,
4362 in->lazy_loaded ? "not yet" : "already"));
4363 #endif
4364
4365 if (in->lazy_loaded && in->hdr_chunk > 0) {
4366 in->lazy_loaded = 0;
4367 chunkData = yaffs_get_temp_buffer(dev, __LINE__);
4368
4369 result = yaffs_rd_chunk_tags_nand(dev, in->hdr_chunk, chunkData, &tags);
4370 oh = (yaffs_obj_header *) chunkData;
4371
4372 in->yst_mode = oh->yst_mode;
4373 #ifdef CONFIG_YAFFS_WINCE
4374 in->win_atime[0] = oh->win_atime[0];
4375 in->win_ctime[0] = oh->win_ctime[0];
4376 in->win_mtime[0] = oh->win_mtime[0];
4377 in->win_atime[1] = oh->win_atime[1];
4378 in->win_ctime[1] = oh->win_ctime[1];
4379 in->win_mtime[1] = oh->win_mtime[1];
4380 #else
4381 in->yst_uid = oh->yst_uid;
4382 in->yst_gid = oh->yst_gid;
4383 in->yst_atime = oh->yst_atime;
4384 in->yst_mtime = oh->yst_mtime;
4385 in->yst_ctime = oh->yst_ctime;
4386 in->yst_rdev = oh->yst_rdev;
4387
4388 #endif
4389 yaffs_set_obj_name_from_oh(in, oh);
4390
4391 if (in->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) {
4392 in->variant.symlink_variant.alias =
4393 yaffs_clone_str(oh->alias);
4394 if (!in->variant.symlink_variant.alias)
4395 alloc_failed = 1; /* Not returned to caller */
4396 }
4397
4398 yaffs_release_temp_buffer(dev, chunkData, __LINE__);
4399 }
4400 }
4401
4402 /*------------------------------ Directory Functions ----------------------------- */
4403
4404 /*
4405 *yaffs_update_parent() handles fixing a directories mtime and ctime when a new
4406 * link (ie. name) is created or deleted in the directory.
4407 *
4408 * ie.
4409 * create dir/a : update dir's mtime/ctime
4410 * rm dir/a: update dir's mtime/ctime
4411 * modify dir/a: don't update dir's mtimme/ctime
4412 *
4413 * This can be handled immediately or defered. Defering helps reduce the number
4414 * of updates when many files in a directory are changed within a brief period.
4415 *
4416 * If the directory updating is defered then yaffs_update_dirty_dirs must be
4417 * called periodically.
4418 */
4419
4420 static void yaffs_update_parent(yaffs_obj_t *obj)
4421 {
4422 yaffs_dev_t *dev;
4423 if(!obj)
4424 return;
4425 #ifndef CONFIG_YAFFS_WINCE
4426
4427 dev = obj->my_dev;
4428 obj->dirty = 1;
4429 obj->yst_mtime = obj->yst_ctime = Y_CURRENT_TIME;
4430 if(dev->param.defered_dir_update){
4431 struct ylist_head *link = &obj->variant.dir_variant.dirty;
4432
4433 if(ylist_empty(link)){
4434 ylist_add(link,&dev->dirty_dirs);
4435 T(YAFFS_TRACE_BACKGROUND, (TSTR("Added object %d to dirty directories" TENDSTR),obj->obj_id));
4436 }
4437
4438 } else
4439 yaffs_update_oh(obj, NULL, 0, 0, 0, NULL);
4440 #endif
4441 }
4442
4443 void yaffs_update_dirty_dirs(yaffs_dev_t *dev)
4444 {
4445 struct ylist_head *link;
4446 yaffs_obj_t *obj;
4447 yaffs_dir_s *dS;
4448 yaffs_obj_variant *oV;
4449
4450 T(YAFFS_TRACE_BACKGROUND, (TSTR("Update dirty directories" TENDSTR)));
4451
4452 while(!ylist_empty(&dev->dirty_dirs)){
4453 link = dev->dirty_dirs.next;
4454 ylist_del_init(link);
4455
4456 dS=ylist_entry(link,yaffs_dir_s,dirty);
4457 oV = ylist_entry(dS,yaffs_obj_variant,dir_variant);
4458 obj = ylist_entry(oV,yaffs_obj_t,variant);
4459
4460 T(YAFFS_TRACE_BACKGROUND, (TSTR("Update directory %d" TENDSTR), obj->obj_id));
4461
4462 if(obj->dirty)
4463 yaffs_update_oh(obj, NULL, 0, 0, 0, NULL);
4464 }
4465 }
4466
4467 static void yaffs_remove_obj_from_dir(yaffs_obj_t *obj)
4468 {
4469 yaffs_dev_t *dev = obj->my_dev;
4470 yaffs_obj_t *parent;
4471
4472 yaffs_verify_obj_in_dir(obj);
4473 parent = obj->parent;
4474
4475 yaffs_verify_dir(parent);
4476
4477 if (dev && dev->param.remove_obj_fn)
4478 dev->param.remove_obj_fn(obj);
4479
4480
4481 ylist_del_init(&obj->siblings);
4482 obj->parent = NULL;
4483
4484 yaffs_verify_dir(parent);
4485 }
4486
4487 void yaffs_add_obj_to_dir(yaffs_obj_t *directory,
4488 yaffs_obj_t *obj)
4489 {
4490 if (!directory) {
4491 T(YAFFS_TRACE_ALWAYS,
4492 (TSTR
4493 ("tragedy: Trying to add an object to a null pointer directory"
4494 TENDSTR)));
4495 YBUG();
4496 return;
4497 }
4498 if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
4499 T(YAFFS_TRACE_ALWAYS,
4500 (TSTR
4501 ("tragedy: Trying to add an object to a non-directory"
4502 TENDSTR)));
4503 YBUG();
4504 }
4505
4506 if (obj->siblings.prev == NULL) {
4507 /* Not initialised */
4508 YBUG();
4509 }
4510
4511
4512 yaffs_verify_dir(directory);
4513
4514 yaffs_remove_obj_from_dir(obj);
4515
4516
4517 /* Now add it */
4518 ylist_add(&obj->siblings, &directory->variant.dir_variant.children);
4519 obj->parent = directory;
4520
4521 if (directory == obj->my_dev->unlinked_dir
4522 || directory == obj->my_dev->del_dir) {
4523 obj->unlinked = 1;
4524 obj->my_dev->n_unlinked_files++;
4525 obj->rename_allowed = 0;
4526 }
4527
4528 yaffs_verify_dir(directory);
4529 yaffs_verify_obj_in_dir(obj);
4530 }
4531
4532 yaffs_obj_t *yaffs_find_by_name(yaffs_obj_t *directory,
4533 const YCHAR *name)
4534 {
4535 int sum;
4536
4537 struct ylist_head *i;
4538 YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
4539
4540 yaffs_obj_t *l;
4541
4542 if (!name)
4543 return NULL;
4544
4545 if (!directory) {
4546 T(YAFFS_TRACE_ALWAYS,
4547 (TSTR
4548 ("tragedy: yaffs_find_by_name: null pointer directory"
4549 TENDSTR)));
4550 YBUG();
4551 return NULL;
4552 }
4553 if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
4554 T(YAFFS_TRACE_ALWAYS,
4555 (TSTR
4556 ("tragedy: yaffs_find_by_name: non-directory" TENDSTR)));
4557 YBUG();
4558 }
4559
4560 sum = yaffs_calc_name_sum(name);
4561
4562 ylist_for_each(i, &directory->variant.dir_variant.children) {
4563 if (i) {
4564 l = ylist_entry(i, yaffs_obj_t, siblings);
4565
4566 if (l->parent != directory)
4567 YBUG();
4568
4569 yaffs_check_obj_details_loaded(l);
4570
4571 /* Special case for lost-n-found */
4572 if (l->obj_id == YAFFS_OBJECTID_LOSTNFOUND) {
4573 if (yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME) == 0)
4574 return l;
4575 } else if (yaffs_sum_cmp(l->sum, sum) || l->hdr_chunk <= 0) {
4576 /* LostnFound chunk called Objxxx
4577 * Do a real check
4578 */
4579 yaffs_get_obj_name(l, buffer,
4580 YAFFS_MAX_NAME_LENGTH + 1);
4581 if (yaffs_strncmp(name, buffer, YAFFS_MAX_NAME_LENGTH) == 0)
4582 return l;
4583 }
4584 }
4585 }
4586
4587 return NULL;
4588 }
4589
4590
4591 #if 0
4592 int yaffs_ApplyToDirectoryChildren(yaffs_obj_t *the_dir,
4593 int (*fn) (yaffs_obj_t *))
4594 {
4595 struct ylist_head *i;
4596 yaffs_obj_t *l;
4597
4598 if (!the_dir) {
4599 T(YAFFS_TRACE_ALWAYS,
4600 (TSTR
4601 ("tragedy: yaffs_find_by_name: null pointer directory"
4602 TENDSTR)));
4603 YBUG();
4604 return YAFFS_FAIL;
4605 }
4606 if (the_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
4607 T(YAFFS_TRACE_ALWAYS,
4608 (TSTR
4609 ("tragedy: yaffs_find_by_name: non-directory" TENDSTR)));
4610 YBUG();
4611 return YAFFS_FAIL;
4612 }
4613
4614 ylist_for_each(i, &the_dir->variant.dir_variant.children) {
4615 if (i) {
4616 l = ylist_entry(i, yaffs_obj_t, siblings);
4617 if (l && !fn(l))
4618 return YAFFS_FAIL;
4619 }
4620 }
4621
4622 return YAFFS_OK;
4623
4624 }
4625 #endif
4626
4627 /* GetEquivalentObject dereferences any hard links to get to the
4628 * actual object.
4629 */
4630
4631 yaffs_obj_t *yaffs_get_equivalent_obj(yaffs_obj_t *obj)
4632 {
4633 if (obj && obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) {
4634 /* We want the object id of the equivalent object, not this one */
4635 obj = obj->variant.hardlink_variant.equiv_obj;
4636 yaffs_check_obj_details_loaded(obj);
4637 }
4638 return obj;
4639 }
4640
4641 /*
4642 * A note or two on object names.
4643 * * If the object name is missing, we then make one up in the form objnnn
4644 *
4645 * * ASCII names are stored in the object header's name field from byte zero
4646 * * Unicode names are historically stored starting from byte zero.
4647 *
4648 * Then there are automatic Unicode names...
4649 * The purpose of these is to save names in a way that can be read as
4650 * ASCII or Unicode names as appropriate, thus allowing a Unicode and ASCII
4651 * system to share files.
4652 *
4653 * These automatic unicode are stored slightly differently...
4654 * - If the name can fit in the ASCII character space then they are saved as
4655 * ascii names as per above.
4656 * - If the name needs Unicode then the name is saved in Unicode
4657 * starting at oh->name[1].
4658
4659 */
4660 static void yaffs_fix_null_name(yaffs_obj_t * obj,YCHAR * name, int buffer_size)
4661 {
4662 /* Create an object name if we could not find one. */
4663 if(yaffs_strnlen(name,YAFFS_MAX_NAME_LENGTH) == 0){
4664 YCHAR locName[20];
4665 YCHAR numString[20];
4666 YCHAR *x = &numString[19];
4667 unsigned v = obj->obj_id;
4668 numString[19] = 0;
4669 while(v>0){
4670 x--;
4671 *x = '0' + (v % 10);
4672 v /= 10;
4673 }
4674 /* make up a name */
4675 yaffs_strcpy(locName, YAFFS_LOSTNFOUND_PREFIX);
4676 yaffs_strcat(locName,x);
4677 yaffs_strncpy(name, locName, buffer_size - 1);
4678 }
4679 }
4680
4681 static void yaffs_load_name_from_oh(yaffs_dev_t *dev,YCHAR *name, const YCHAR *ohName, int bufferSize)
4682 {
4683 #ifdef CONFIG_YAFFS_AUTO_UNICODE
4684 if(dev->param.auto_unicode){
4685 if(*ohName){
4686 /* It is an ASCII name, so do an ASCII to unicode conversion */
4687 const char *asciiOhName = (const char *)ohName;
4688 int n = bufferSize - 1;
4689 while(n > 0 && *asciiOhName){
4690 *name = *asciiOhName;
4691 name++;
4692 asciiOhName++;
4693 n--;
4694 }
4695 } else
4696 yaffs_strncpy(name,ohName+1, bufferSize -1);
4697 } else
4698 #endif
4699 yaffs_strncpy(name, ohName, bufferSize - 1);
4700 }
4701
4702
4703 static void yaffs_load_oh_from_name(yaffs_dev_t *dev, YCHAR *ohName, const YCHAR *name)
4704 {
4705 #ifdef CONFIG_YAFFS_AUTO_UNICODE
4706
4707 int isAscii;
4708 YCHAR *w;
4709
4710 if(dev->param.auto_unicode){
4711
4712 isAscii = 1;
4713 w = name;
4714
4715 /* Figure out if the name will fit in ascii character set */
4716 while(isAscii && *w){
4717 if((*w) & 0xff00)
4718 isAscii = 0;
4719 w++;
4720 }
4721
4722 if(isAscii){
4723 /* It is an ASCII name, so do a unicode to ascii conversion */
4724 char *asciiOhName = (char *)ohName;
4725 int n = YAFFS_MAX_NAME_LENGTH - 1;
4726 while(n > 0 && *name){
4727 *asciiOhName= *name;
4728 name++;
4729 asciiOhName++;
4730 n--;
4731 }
4732 } else{
4733 /* It is a unicode name, so save starting at the second YCHAR */
4734 *ohName = 0;
4735 yaffs_strncpy(ohName+1,name, YAFFS_MAX_NAME_LENGTH -2);
4736 }
4737 }
4738 else
4739 #endif
4740 yaffs_strncpy(ohName,name, YAFFS_MAX_NAME_LENGTH - 1);
4741
4742 }
4743
4744 int yaffs_get_obj_name(yaffs_obj_t * obj, YCHAR * name, int buffer_size)
4745 {
4746 memset(name, 0, buffer_size * sizeof(YCHAR));
4747
4748 yaffs_check_obj_details_loaded(obj);
4749
4750 if (obj->obj_id == YAFFS_OBJECTID_LOSTNFOUND) {
4751 yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffer_size - 1);
4752 }
4753 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
4754 else if (obj->short_name[0]) {
4755 yaffs_strcpy(name, obj->short_name);
4756 }
4757 #endif
4758 else if(obj->hdr_chunk > 0) {
4759 int result;
4760 __u8 *buffer = yaffs_get_temp_buffer(obj->my_dev, __LINE__);
4761
4762 yaffs_obj_header *oh = (yaffs_obj_header *) buffer;
4763
4764 memset(buffer, 0, obj->my_dev->data_bytes_per_chunk);
4765
4766 if (obj->hdr_chunk > 0) {
4767 result = yaffs_rd_chunk_tags_nand(obj->my_dev,
4768 obj->hdr_chunk, buffer,
4769 NULL);
4770 }
4771 yaffs_load_name_from_oh(obj->my_dev,name,oh->name,buffer_size);
4772
4773 yaffs_release_temp_buffer(obj->my_dev, buffer, __LINE__);
4774 }
4775
4776 yaffs_fix_null_name(obj,name,buffer_size);
4777
4778 return yaffs_strnlen(name,YAFFS_MAX_NAME_LENGTH);
4779 }
4780
4781
4782 int yaffs_get_obj_length(yaffs_obj_t *obj)
4783 {
4784 /* Dereference any hard linking */
4785 obj = yaffs_get_equivalent_obj(obj);
4786
4787 if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE)
4788 return obj->variant.file_variant.file_size;
4789 if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK){
4790 if(!obj->variant.symlink_variant.alias)
4791 return 0;
4792 return yaffs_strnlen(obj->variant.symlink_variant.alias,YAFFS_MAX_ALIAS_LENGTH);
4793 } else {
4794 /* Only a directory should drop through to here */
4795 return obj->my_dev->data_bytes_per_chunk;
4796 }
4797 }
4798
4799 int yaffs_get_obj_link_count(yaffs_obj_t *obj)
4800 {
4801 int count = 0;
4802 struct ylist_head *i;
4803
4804 if (!obj->unlinked)
4805 count++; /* the object itself */
4806
4807 ylist_for_each(i, &obj->hard_links)
4808 count++; /* add the hard links; */
4809
4810 return count;
4811 }
4812
4813 int yaffs_get_obj_inode(yaffs_obj_t *obj)
4814 {
4815 obj = yaffs_get_equivalent_obj(obj);
4816
4817 return obj->obj_id;
4818 }
4819
4820 unsigned yaffs_get_obj_type(yaffs_obj_t *obj)
4821 {
4822 obj = yaffs_get_equivalent_obj(obj);
4823
4824 switch (obj->variant_type) {
4825 case YAFFS_OBJECT_TYPE_FILE:
4826 return DT_REG;
4827 break;
4828 case YAFFS_OBJECT_TYPE_DIRECTORY:
4829 return DT_DIR;
4830 break;
4831 case YAFFS_OBJECT_TYPE_SYMLINK:
4832 return DT_LNK;
4833 break;
4834 case YAFFS_OBJECT_TYPE_HARDLINK:
4835 return DT_REG;
4836 break;
4837 case YAFFS_OBJECT_TYPE_SPECIAL:
4838 if (S_ISFIFO(obj->yst_mode))
4839 return DT_FIFO;
4840 if (S_ISCHR(obj->yst_mode))
4841 return DT_CHR;
4842 if (S_ISBLK(obj->yst_mode))
4843 return DT_BLK;
4844 if (S_ISSOCK(obj->yst_mode))
4845 return DT_SOCK;
4846 default:
4847 return DT_REG;
4848 break;
4849 }
4850 }
4851
4852 YCHAR *yaffs_get_symlink_alias(yaffs_obj_t *obj)
4853 {
4854 obj = yaffs_get_equivalent_obj(obj);
4855 if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK)
4856 return yaffs_clone_str(obj->variant.symlink_variant.alias);
4857 else
4858 return yaffs_clone_str(_Y(""));
4859 }
4860
4861 #ifndef CONFIG_YAFFS_WINCE
4862
4863 int yaffs_set_attribs(yaffs_obj_t *obj, struct iattr *attr)
4864 {
4865 unsigned int valid = attr->ia_valid;
4866
4867 if (valid & ATTR_MODE)
4868 obj->yst_mode = attr->ia_mode;
4869 if (valid & ATTR_UID)
4870 obj->yst_uid = attr->ia_uid;
4871 if (valid & ATTR_GID)
4872 obj->yst_gid = attr->ia_gid;
4873
4874 if (valid & ATTR_ATIME)
4875 obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
4876 if (valid & ATTR_CTIME)
4877 obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
4878 if (valid & ATTR_MTIME)
4879 obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
4880
4881 if (valid & ATTR_SIZE)
4882 yaffs_resize_file(obj, attr->ia_size);
4883
4884 yaffs_update_oh(obj, NULL, 1, 0, 0, NULL);
4885
4886 return YAFFS_OK;
4887
4888 }
4889 int yaffs_get_attribs(yaffs_obj_t *obj, struct iattr *attr)
4890 {
4891 unsigned int valid = 0;
4892
4893 attr->ia_mode = obj->yst_mode;
4894 valid |= ATTR_MODE;
4895 attr->ia_uid = obj->yst_uid;
4896 valid |= ATTR_UID;
4897 attr->ia_gid = obj->yst_gid;
4898 valid |= ATTR_GID;
4899
4900 Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime;
4901 valid |= ATTR_ATIME;
4902 Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime;
4903 valid |= ATTR_CTIME;
4904 Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime;
4905 valid |= ATTR_MTIME;
4906
4907 attr->ia_size = yaffs_get_file_size(obj);
4908 valid |= ATTR_SIZE;
4909
4910 attr->ia_valid = valid;
4911
4912 return YAFFS_OK;
4913 }
4914
4915 #endif
4916
4917
4918 static int yaffs_do_xattrib_mod(yaffs_obj_t *obj, int set, const YCHAR *name, const void *value, int size, int flags)
4919 {
4920 yaffs_xattr_mod xmod;
4921
4922 int result;
4923
4924 xmod.set = set;
4925 xmod.name = name;
4926 xmod.data = value;
4927 xmod.size = size;
4928 xmod.flags = flags;
4929 xmod.result = -ENOSPC;
4930
4931 result = yaffs_update_oh(obj, NULL, 0, 0, 0, &xmod);
4932
4933 if(result > 0)
4934 return xmod.result;
4935 else
4936 return -ENOSPC;
4937 }
4938
4939 static int yaffs_apply_xattrib_mod(yaffs_obj_t *obj, char *buffer, yaffs_xattr_mod *xmod)
4940 {
4941 int retval = 0;
4942 int x_offs = sizeof(yaffs_obj_header);
4943 yaffs_dev_t *dev = obj->my_dev;
4944 int x_size = dev->data_bytes_per_chunk - sizeof(yaffs_obj_header);
4945
4946 char * x_buffer = buffer + x_offs;
4947
4948 if(xmod->set)
4949 retval = nval_set(x_buffer, x_size, xmod->name, xmod->data, xmod->size, xmod->flags);
4950 else
4951 retval = nval_del(x_buffer, x_size, xmod->name);
4952
4953 obj->has_xattr = nval_hasvalues(x_buffer, x_size);
4954 obj->xattr_known = 1;
4955
4956 xmod->result = retval;
4957
4958 return retval;
4959 }
4960
4961 static int yaffs_do_xattrib_fetch(yaffs_obj_t *obj, const YCHAR *name, void *value, int size)
4962 {
4963 char *buffer = NULL;
4964 int result;
4965 yaffs_ext_tags tags;
4966 yaffs_dev_t *dev = obj->my_dev;
4967 int x_offs = sizeof(yaffs_obj_header);
4968 int x_size = dev->data_bytes_per_chunk - sizeof(yaffs_obj_header);
4969
4970 char * x_buffer;
4971
4972 int retval = 0;
4973
4974 if(obj->hdr_chunk < 1)
4975 return -ENODATA;
4976
4977 /* If we know that the object has no xattribs then don't do all the
4978 * reading and parsing.
4979 */
4980 if(obj->xattr_known && !obj->has_xattr){
4981 if(name)
4982 return -ENODATA;
4983 else
4984 return 0;
4985 }
4986
4987 buffer = (char *) yaffs_get_temp_buffer(dev, __LINE__);
4988 if(!buffer)
4989 return -ENOMEM;
4990
4991 result = yaffs_rd_chunk_tags_nand(dev,obj->hdr_chunk, (__u8 *)buffer, &tags);
4992
4993 if(result != YAFFS_OK)
4994 retval = -ENOENT;
4995 else{
4996 x_buffer = buffer + x_offs;
4997
4998 if (!obj->xattr_known){
4999 obj->has_xattr = nval_hasvalues(x_buffer, x_size);
5000 obj->xattr_known = 1;
5001 }
5002
5003 if(name)
5004 retval = nval_get(x_buffer, x_size, name, value, size);
5005 else
5006 retval = nval_list(x_buffer, x_size, value,size);
5007 }
5008 yaffs_release_temp_buffer(dev,(__u8 *)buffer,__LINE__);
5009 return retval;
5010 }
5011
5012 int yaffs_set_xattrib(yaffs_obj_t *obj, const YCHAR *name, const void * value, int size, int flags)
5013 {
5014 return yaffs_do_xattrib_mod(obj, 1, name, value, size, flags);
5015 }
5016
5017 int yaffs_remove_xattrib(yaffs_obj_t *obj, const YCHAR *name)
5018 {
5019 return yaffs_do_xattrib_mod(obj, 0, name, NULL, 0, 0);
5020 }
5021
5022 int yaffs_get_xattrib(yaffs_obj_t *obj, const YCHAR *name, void *value, int size)
5023 {
5024 return yaffs_do_xattrib_fetch(obj, name, value, size);
5025 }
5026
5027 int yaffs_list_xattrib(yaffs_obj_t *obj, char *buffer, int size)
5028 {
5029 return yaffs_do_xattrib_fetch(obj, NULL, buffer,size);
5030 }
5031
5032
5033
5034 #if 0
5035 int yaffs_dump_obj(yaffs_obj_t *obj)
5036 {
5037 YCHAR name[257];
5038
5039 yaffs_get_obj_name(obj, name, YAFFS_MAX_NAME_LENGTH + 1);
5040
5041 T(YAFFS_TRACE_ALWAYS,
5042 (TSTR
5043 ("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d"
5044 " chunk %d type %d size %d\n"
5045 TENDSTR), obj->obj_id, yaffs_get_obj_inode(obj), name,
5046 obj->dirty, obj->valid, obj->serial, obj->sum, obj->hdr_chunk,
5047 yaffs_get_obj_type(obj), yaffs_get_obj_length(obj)));
5048
5049 return YAFFS_OK;
5050 }
5051 #endif
5052
5053 /*---------------------------- Initialisation code -------------------------------------- */
5054
5055 static int yaffs_cehck_dev_fns(const yaffs_dev_t *dev)
5056 {
5057
5058 /* Common functions, gotta have */
5059 if (!dev->param.erase_fn || !dev->param.initialise_flash_fn)
5060 return 0;
5061
5062 #ifdef CONFIG_YAFFS_YAFFS2
5063
5064 /* Can use the "with tags" style interface for yaffs1 or yaffs2 */
5065 if (dev->param.write_chunk_tags_fn &&
5066 dev->param.read_chunk_tags_fn &&
5067 !dev->param.write_chunk_fn &&
5068 !dev->param.read_chunk_fn &&
5069 dev->param.bad_block_fn &&
5070 dev->param.query_block_fn)
5071 return 1;
5072 #endif
5073
5074 /* Can use the "spare" style interface for yaffs1 */
5075 if (!dev->param.is_yaffs2 &&
5076 !dev->param.write_chunk_tags_fn &&
5077 !dev->param.read_chunk_tags_fn &&
5078 dev->param.write_chunk_fn &&
5079 dev->param.read_chunk_fn &&
5080 !dev->param.bad_block_fn &&
5081 !dev->param.query_block_fn)
5082 return 1;
5083
5084 return 0; /* bad */
5085 }
5086
5087
5088 static int yaffs_create_initial_dir(yaffs_dev_t *dev)
5089 {
5090 /* Initialise the unlinked, deleted, root and lost and found directories */
5091
5092 dev->lost_n_found = dev->root_dir = NULL;
5093 dev->unlinked_dir = dev->del_dir = NULL;
5094
5095 dev->unlinked_dir =
5096 yaffs_create_fake_dir(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
5097
5098 dev->del_dir =
5099 yaffs_create_fake_dir(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
5100
5101 dev->root_dir =
5102 yaffs_create_fake_dir(dev, YAFFS_OBJECTID_ROOT,
5103 YAFFS_ROOT_MODE | S_IFDIR);
5104 dev->lost_n_found =
5105 yaffs_create_fake_dir(dev, YAFFS_OBJECTID_LOSTNFOUND,
5106 YAFFS_LOSTNFOUND_MODE | S_IFDIR);
5107
5108 if (dev->lost_n_found && dev->root_dir && dev->unlinked_dir && dev->del_dir) {
5109 yaffs_add_obj_to_dir(dev->root_dir, dev->lost_n_found);
5110 return YAFFS_OK;
5111 }
5112
5113 return YAFFS_FAIL;
5114 }
5115
5116 int yaffs_guts_initialise(yaffs_dev_t *dev)
5117 {
5118 int init_failed = 0;
5119 unsigned x;
5120 int bits;
5121
5122 T(YAFFS_TRACE_TRACING, (TSTR("yaffs: yaffs_guts_initialise()" TENDSTR)));
5123
5124 /* Check stuff that must be set */
5125
5126 if (!dev) {
5127 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Need a device" TENDSTR)));
5128 return YAFFS_FAIL;
5129 }
5130
5131 dev->internal_start_block = dev->param.start_block;
5132 dev->internal_end_block = dev->param.end_block;
5133 dev->block_offset = 0;
5134 dev->chunk_offset = 0;
5135 dev->n_free_chunks = 0;
5136
5137 dev->gc_block = 0;
5138
5139 if (dev->param.start_block == 0) {
5140 dev->internal_start_block = dev->param.start_block + 1;
5141 dev->internal_end_block = dev->param.end_block + 1;
5142 dev->block_offset = 1;
5143 dev->chunk_offset = dev->param.chunks_per_block;
5144 }
5145
5146 /* Check geometry parameters. */
5147
5148 if ((!dev->param.inband_tags && dev->param.is_yaffs2 && dev->param.total_bytes_per_chunk < 1024) ||
5149 (!dev->param.is_yaffs2 && dev->param.total_bytes_per_chunk < 512) ||
5150 (dev->param.inband_tags && !dev->param.is_yaffs2) ||
5151 dev->param.chunks_per_block < 2 ||
5152 dev->param.n_reserved_blocks < 2 ||
5153 dev->internal_start_block <= 0 ||
5154 dev->internal_end_block <= 0 ||
5155 dev->internal_end_block <= (dev->internal_start_block + dev->param.n_reserved_blocks + 2)) { /* otherwise it is too small */
5156 T(YAFFS_TRACE_ALWAYS,
5157 (TSTR
5158 ("yaffs: NAND geometry problems: chunk size %d, type is yaffs%s, inband_tags %d "
5159 TENDSTR), dev->param.total_bytes_per_chunk, dev->param.is_yaffs2 ? "2" : "", dev->param.inband_tags));
5160 return YAFFS_FAIL;
5161 }
5162
5163 if (yaffs_init_nand(dev) != YAFFS_OK) {
5164 T(YAFFS_TRACE_ALWAYS,
5165 (TSTR("yaffs: InitialiseNAND failed" TENDSTR)));
5166 return YAFFS_FAIL;
5167 }
5168
5169 /* Sort out space for inband tags, if required */
5170 if (dev->param.inband_tags)
5171 dev->data_bytes_per_chunk = dev->param.total_bytes_per_chunk - sizeof(yaffs_PackedTags2TagsPart);
5172 else
5173 dev->data_bytes_per_chunk = dev->param.total_bytes_per_chunk;
5174
5175 /* Got the right mix of functions? */
5176 if (!yaffs_cehck_dev_fns(dev)) {
5177 /* Function missing */
5178 T(YAFFS_TRACE_ALWAYS,
5179 (TSTR
5180 ("yaffs: device function(s) missing or wrong\n" TENDSTR)));
5181
5182 return YAFFS_FAIL;
5183 }
5184
5185 /* This is really a compilation check. */
5186 if (!yaffs_check_structures()) {
5187 T(YAFFS_TRACE_ALWAYS,
5188 (TSTR("yaffs_check_structures failed\n" TENDSTR)));
5189 return YAFFS_FAIL;
5190 }
5191
5192 if (dev->is_mounted) {
5193 T(YAFFS_TRACE_ALWAYS,
5194 (TSTR("yaffs: device already mounted\n" TENDSTR)));
5195 return YAFFS_FAIL;
5196 }
5197
5198 /* Finished with most checks. One or two more checks happen later on too. */
5199
5200 dev->is_mounted = 1;
5201
5202 /* OK now calculate a few things for the device */
5203
5204 /*
5205 * Calculate all the chunk size manipulation numbers:
5206 */
5207 x = dev->data_bytes_per_chunk;
5208 /* We always use dev->chunk_shift and dev->chunk_div */
5209 dev->chunk_shift = Shifts(x);
5210 x >>= dev->chunk_shift;
5211 dev->chunk_div = x;
5212 /* We only use chunk mask if chunk_div is 1 */
5213 dev->chunk_mask = (1<<dev->chunk_shift) - 1;
5214
5215 /*
5216 * Calculate chunk_grp_bits.
5217 * We need to find the next power of 2 > than internal_end_block
5218 */
5219
5220 x = dev->param.chunks_per_block * (dev->internal_end_block + 1);
5221
5222 bits = ShiftsGE(x);
5223
5224 /* Set up tnode width if wide tnodes are enabled. */
5225 if (!dev->param.wide_tnodes_disabled) {
5226 /* bits must be even so that we end up with 32-bit words */
5227 if (bits & 1)
5228 bits++;
5229 if (bits < 16)
5230 dev->tnode_width = 16;
5231 else
5232 dev->tnode_width = bits;
5233 } else
5234 dev->tnode_width = 16;
5235
5236 dev->tnode_mask = (1<<dev->tnode_width)-1;
5237
5238 /* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
5239 * so if the bitwidth of the
5240 * chunk range we're using is greater than 16 we need
5241 * to figure out chunk shift and chunk_grp_size
5242 */
5243
5244 if (bits <= dev->tnode_width)
5245 dev->chunk_grp_bits = 0;
5246 else
5247 dev->chunk_grp_bits = bits - dev->tnode_width;
5248
5249 dev->tnode_size = (dev->tnode_width * YAFFS_NTNODES_LEVEL0)/8;
5250 if(dev->tnode_size < sizeof(yaffs_tnode_t))
5251 dev->tnode_size = sizeof(yaffs_tnode_t);
5252
5253 dev->chunk_grp_size = 1 << dev->chunk_grp_bits;
5254
5255 if (dev->param.chunks_per_block < dev->chunk_grp_size) {
5256 /* We have a problem because the soft delete won't work if
5257 * the chunk group size > chunks per block.
5258 * This can be remedied by using larger "virtual blocks".
5259 */
5260 T(YAFFS_TRACE_ALWAYS,
5261 (TSTR("yaffs: chunk group too large\n" TENDSTR)));
5262
5263 return YAFFS_FAIL;
5264 }
5265
5266 /* OK, we've finished verifying the device, lets continue with initialisation */
5267
5268 /* More device initialisation */
5269 dev->all_gcs = 0;
5270 dev->passive_gc_count = 0;
5271 dev->oldest_dirty_gc_count = 0;
5272 dev->bg_gcs = 0;
5273 dev->gc_block_finder = 0;
5274 dev->buffered_block = -1;
5275 dev->doing_buffered_block_rewrite = 0;
5276 dev->n_deleted_files = 0;
5277 dev->n_bg_deletions = 0;
5278 dev->n_unlinked_files = 0;
5279 dev->n_ecc_fixed = 0;
5280 dev->n_ecc_unfixed = 0;
5281 dev->n_tags_ecc_fixed = 0;
5282 dev->n_tags_ecc_unfixed = 0;
5283 dev->n_erase_failures = 0;
5284 dev->n_erased_blocks = 0;
5285 dev->gc_disable= 0;
5286 dev->has_pending_prioritised_gc = 1; /* Assume the worst for now, will get fixed on first GC */
5287 YINIT_LIST_HEAD(&dev->dirty_dirs);
5288 dev->oldest_dirty_seq = 0;
5289 dev->oldest_dirty_block = 0;
5290
5291 /* Initialise temporary buffers and caches. */
5292 if (!yaffs_init_tmp_buffers(dev))
5293 init_failed = 1;
5294
5295 dev->cache = NULL;
5296 dev->gc_cleanup_list = NULL;
5297
5298
5299 if (!init_failed &&
5300 dev->param.n_caches > 0) {
5301 int i;
5302 void *buf;
5303 int cacheBytes = dev->param.n_caches * sizeof(yaffs_cache_t);
5304
5305 if (dev->param.n_caches > YAFFS_MAX_SHORT_OP_CACHES)
5306 dev->param.n_caches = YAFFS_MAX_SHORT_OP_CACHES;
5307
5308 dev->cache = YMALLOC(cacheBytes);
5309
5310 buf = (__u8 *) dev->cache;
5311
5312 if (dev->cache)
5313 memset(dev->cache, 0, cacheBytes);
5314
5315 for (i = 0; i < dev->param.n_caches && buf; i++) {
5316 dev->cache[i].object = NULL;
5317 dev->cache[i].last_use = 0;
5318 dev->cache[i].dirty = 0;
5319 dev->cache[i].data = buf = YMALLOC_DMA(dev->param.total_bytes_per_chunk);
5320 }
5321 if (!buf)
5322 init_failed = 1;
5323
5324 dev->cache_last_use = 0;
5325 }
5326
5327 dev->cache_hits = 0;
5328
5329 if (!init_failed) {
5330 dev->gc_cleanup_list = YMALLOC(dev->param.chunks_per_block * sizeof(__u32));
5331 if (!dev->gc_cleanup_list)
5332 init_failed = 1;
5333 }
5334
5335 if (dev->param.is_yaffs2)
5336 dev->param.use_header_file_size = 1;
5337
5338 if (!init_failed && !yaffs_init_blocks(dev))
5339 init_failed = 1;
5340
5341 yaffs_init_tnodes_and_objs(dev);
5342
5343 if (!init_failed && !yaffs_create_initial_dir(dev))
5344 init_failed = 1;
5345
5346
5347 if (!init_failed) {
5348 /* Now scan the flash. */
5349 if (dev->param.is_yaffs2) {
5350 if (yaffs2_checkpt_restore(dev)) {
5351 yaffs_check_obj_details_loaded(dev->root_dir);
5352 T(YAFFS_TRACE_ALWAYS,
5353 (TSTR("yaffs: restored from checkpoint" TENDSTR)));
5354 } else {
5355
5356 /* Clean up the mess caused by an aborted checkpoint load
5357 * and scan backwards.
5358 */
5359 yaffs_deinit_blocks(dev);
5360
5361 yaffs_deinit_tnodes_and_objs(dev);
5362
5363 dev->n_erased_blocks = 0;
5364 dev->n_free_chunks = 0;
5365 dev->alloc_block = -1;
5366 dev->alloc_page = -1;
5367 dev->n_deleted_files = 0;
5368 dev->n_unlinked_files = 0;
5369 dev->n_bg_deletions = 0;
5370
5371 if (!init_failed && !yaffs_init_blocks(dev))
5372 init_failed = 1;
5373
5374 yaffs_init_tnodes_and_objs(dev);
5375
5376 if (!init_failed && !yaffs_create_initial_dir(dev))
5377 init_failed = 1;
5378
5379 if (!init_failed && !yaffs2_scan_backwards(dev))
5380 init_failed = 1;
5381 }
5382 } else if (!yaffs1_scan(dev))
5383 init_failed = 1;
5384
5385 yaffs_strip_deleted_objs(dev);
5386 yaffs_fix_hanging_objs(dev);
5387 if(dev->param.empty_lost_n_found)
5388 yaffs_empty_l_n_f(dev);
5389 }
5390
5391 if (init_failed) {
5392 /* Clean up the mess */
5393 T(YAFFS_TRACE_TRACING,
5394 (TSTR("yaffs: yaffs_guts_initialise() aborted.\n" TENDSTR)));
5395
5396 yaffs_deinitialise(dev);
5397 return YAFFS_FAIL;
5398 }
5399
5400 /* Zero out stats */
5401 dev->n_page_reads = 0;
5402 dev->n_page_writes = 0;
5403 dev->n_erasures = 0;
5404 dev->n_gc_copies = 0;
5405 dev->n_retired_writes = 0;
5406
5407 dev->n_retired_blocks = 0;
5408
5409 yaffs_verify_free_chunks(dev);
5410 yaffs_verify_blocks(dev);
5411
5412 /* Clean up any aborted checkpoint data */
5413 if(!dev->is_checkpointed && dev->blocks_in_checkpt > 0)
5414 yaffs2_checkpt_invalidate(dev);
5415
5416 T(YAFFS_TRACE_TRACING,
5417 (TSTR("yaffs: yaffs_guts_initialise() done.\n" TENDSTR)));
5418 return YAFFS_OK;
5419
5420 }
5421
5422 void yaffs_deinitialise(yaffs_dev_t *dev)
5423 {
5424 if (dev->is_mounted) {
5425 int i;
5426
5427 yaffs_deinit_blocks(dev);
5428 yaffs_deinit_tnodes_and_objs(dev);
5429 if (dev->param.n_caches > 0 &&
5430 dev->cache) {
5431
5432 for (i = 0; i < dev->param.n_caches; i++) {
5433 if (dev->cache[i].data)
5434 YFREE(dev->cache[i].data);
5435 dev->cache[i].data = NULL;
5436 }
5437
5438 YFREE(dev->cache);
5439 dev->cache = NULL;
5440 }
5441
5442 YFREE(dev->gc_cleanup_list);
5443
5444 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
5445 YFREE(dev->temp_buffer[i].buffer);
5446
5447 dev->is_mounted = 0;
5448
5449 if (dev->param.deinitialise_flash_fn)
5450 dev->param.deinitialise_flash_fn(dev);
5451 }
5452 }
5453
5454 int yaffs_count_free_chunks(yaffs_dev_t *dev)
5455 {
5456 int nFree=0;
5457 int b;
5458
5459 yaffs_block_info_t *blk;
5460
5461 blk = dev->block_info;
5462 for (b = dev->internal_start_block; b <= dev->internal_end_block; b++) {
5463 switch (blk->block_state) {
5464 case YAFFS_BLOCK_STATE_EMPTY:
5465 case YAFFS_BLOCK_STATE_ALLOCATING:
5466 case YAFFS_BLOCK_STATE_COLLECTING:
5467 case YAFFS_BLOCK_STATE_FULL:
5468 nFree +=
5469 (dev->param.chunks_per_block - blk->pages_in_use +
5470 blk->soft_del_pages);
5471 break;
5472 default:
5473 break;
5474 }
5475 blk++;
5476 }
5477
5478 return nFree;
5479 }
5480
5481 int yaffs_get_n_free_chunks(yaffs_dev_t *dev)
5482 {
5483 /* This is what we report to the outside world */
5484
5485 int nFree;
5486 int nDirtyCacheChunks;
5487 int blocksForCheckpoint;
5488 int i;
5489
5490 #if 1
5491 nFree = dev->n_free_chunks;
5492 #else
5493 nFree = yaffs_count_free_chunks(dev);
5494 #endif
5495
5496 nFree += dev->n_deleted_files;
5497
5498 /* Now count the number of dirty chunks in the cache and subtract those */
5499
5500 for (nDirtyCacheChunks = 0, i = 0; i < dev->param.n_caches; i++) {
5501 if (dev->cache[i].dirty)
5502 nDirtyCacheChunks++;
5503 }
5504
5505 nFree -= nDirtyCacheChunks;
5506
5507 nFree -= ((dev->param.n_reserved_blocks + 1) * dev->param.chunks_per_block);
5508
5509 /* Now we figure out how much to reserve for the checkpoint and report that... */
5510 blocksForCheckpoint = yaffs_calc_checkpt_blocks_required(dev);
5511
5512 nFree -= (blocksForCheckpoint * dev->param.chunks_per_block);
5513
5514 if (nFree < 0)
5515 nFree = 0;
5516
5517 return nFree;
5518
5519 }
5520
5521
5522 /*---------------------------------------- YAFFS test code ----------------------*/
5523
5524 #define yaffs_check_struct(structure, syze, name) \
5525 do { \
5526 if (sizeof(structure) != syze) { \
5527 T(YAFFS_TRACE_ALWAYS, (TSTR("%s should be %d but is %d\n" TENDSTR),\
5528 name, syze, (int) sizeof(structure))); \
5529 return YAFFS_FAIL; \
5530 } \
5531 } while (0)
5532
5533 static int yaffs_check_structures(void)
5534 {
5535 /* yaffs_check_struct(yaffs_tags_t,8,"yaffs_tags_t"); */
5536 /* yaffs_check_struct(yaffs_tags_union_t,8,"yaffs_tags_union_t"); */
5537 /* yaffs_check_struct(yaffs_spare,16,"yaffs_spare"); */
5538 /* yaffs_check_struct(yaffs_tnode_t, 2 * YAFFS_NTNODES_LEVEL0, "yaffs_tnode_t"); */
5539
5540 #ifndef CONFIG_YAFFS_WINCE
5541 yaffs_check_struct(yaffs_obj_header, 512, "yaffs_obj_header");
5542 #endif
5543 return YAFFS_OK;
5544 }
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