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netfilter: fix ebtables dependencies
[linux-2.6/mini2440.git] / fs / fat / fatent.c
blobfb98b3d847ed2d820e6b4425c44ef44e028a66eb
1 /*
2 * Copyright (C) 2004, OGAWA Hirofumi
3 * Released under GPL v2.
4 */
5
6 #include <linux/module.h>
7 #include <linux/fs.h>
8 #include <linux/msdos_fs.h>
9 #include <linux/blkdev.h>
10
11 struct fatent_operations {
12 void (*ent_blocknr)(struct super_block *, int, int *, sector_t *);
13 void (*ent_set_ptr)(struct fat_entry *, int);
14 int (*ent_bread)(struct super_block *, struct fat_entry *,
15 int, sector_t);
16 int (*ent_get)(struct fat_entry *);
17 void (*ent_put)(struct fat_entry *, int);
18 int (*ent_next)(struct fat_entry *);
19 };
20
21 static DEFINE_SPINLOCK(fat12_entry_lock);
22
23 static void fat12_ent_blocknr(struct super_block *sb, int entry,
24 int *offset, sector_t *blocknr)
25 {
26 struct msdos_sb_info *sbi = MSDOS_SB(sb);
27 int bytes = entry + (entry >> 1);
28 WARN_ON(entry < FAT_START_ENT || sbi->max_cluster <= entry);
29 *offset = bytes & (sb->s_blocksize - 1);
30 *blocknr = sbi->fat_start + (bytes >> sb->s_blocksize_bits);
31 }
32
33 static void fat_ent_blocknr(struct super_block *sb, int entry,
34 int *offset, sector_t *blocknr)
35 {
36 struct msdos_sb_info *sbi = MSDOS_SB(sb);
37 int bytes = (entry << sbi->fatent_shift);
38 WARN_ON(entry < FAT_START_ENT || sbi->max_cluster <= entry);
39 *offset = bytes & (sb->s_blocksize - 1);
40 *blocknr = sbi->fat_start + (bytes >> sb->s_blocksize_bits);
41 }
42
43 static void fat12_ent_set_ptr(struct fat_entry *fatent, int offset)
44 {
45 struct buffer_head **bhs = fatent->bhs;
46 if (fatent->nr_bhs == 1) {
47 WARN_ON(offset >= (bhs[0]->b_size - 1));
48 fatent->u.ent12_p[0] = bhs[0]->b_data + offset;
49 fatent->u.ent12_p[1] = bhs[0]->b_data + (offset + 1);
50 } else {
51 WARN_ON(offset != (bhs[0]->b_size - 1));
52 fatent->u.ent12_p[0] = bhs[0]->b_data + offset;
53 fatent->u.ent12_p[1] = bhs[1]->b_data;
54 }
55 }
56
57 static void fat16_ent_set_ptr(struct fat_entry *fatent, int offset)
58 {
59 WARN_ON(offset & (2 - 1));
60 fatent->u.ent16_p = (__le16 *)(fatent->bhs[0]->b_data + offset);
61 }
62
63 static void fat32_ent_set_ptr(struct fat_entry *fatent, int offset)
64 {
65 WARN_ON(offset & (4 - 1));
66 fatent->u.ent32_p = (__le32 *)(fatent->bhs[0]->b_data + offset);
67 }
68
69 static int fat12_ent_bread(struct super_block *sb, struct fat_entry *fatent,
70 int offset, sector_t blocknr)
71 {
72 struct buffer_head **bhs = fatent->bhs;
73
74 WARN_ON(blocknr < MSDOS_SB(sb)->fat_start);
75 bhs[0] = sb_bread(sb, blocknr);
76 if (!bhs[0])
77 goto err;
78
79 if ((offset + 1) < sb->s_blocksize)
80 fatent->nr_bhs = 1;
81 else {
82 /* This entry is block boundary, it needs the next block */
83 blocknr++;
84 bhs[1] = sb_bread(sb, blocknr);
85 if (!bhs[1])
86 goto err_brelse;
87 fatent->nr_bhs = 2;
88 }
89 fat12_ent_set_ptr(fatent, offset);
90 return 0;
91
92 err_brelse:
93 brelse(bhs[0]);
94 err:
95 printk(KERN_ERR "FAT: FAT read failed (blocknr %llu)\n",
96 (unsigned long long)blocknr);
97 return -EIO;
98 }
99
100 static int fat_ent_bread(struct super_block *sb, struct fat_entry *fatent,
101 int offset, sector_t blocknr)
102 {
103 struct fatent_operations *ops = MSDOS_SB(sb)->fatent_ops;
104
105 WARN_ON(blocknr < MSDOS_SB(sb)->fat_start);
106 fatent->bhs[0] = sb_bread(sb, blocknr);
107 if (!fatent->bhs[0]) {
108 printk(KERN_ERR "FAT: FAT read failed (blocknr %llu)\n",
109 (unsigned long long)blocknr);
110 return -EIO;
111 }
112 fatent->nr_bhs = 1;
113 ops->ent_set_ptr(fatent, offset);
114 return 0;
115 }
116
117 static int fat12_ent_get(struct fat_entry *fatent)
118 {
119 u8 **ent12_p = fatent->u.ent12_p;
120 int next;
121
122 spin_lock(&fat12_entry_lock);
123 if (fatent->entry & 1)
124 next = (*ent12_p[0] >> 4) | (*ent12_p[1] << 4);
125 else
126 next = (*ent12_p[1] << 8) | *ent12_p[0];
127 spin_unlock(&fat12_entry_lock);
128
129 next &= 0x0fff;
130 if (next >= BAD_FAT12)
131 next = FAT_ENT_EOF;
132 return next;
133 }
134
135 static int fat16_ent_get(struct fat_entry *fatent)
136 {
137 int next = le16_to_cpu(*fatent->u.ent16_p);
138 WARN_ON((unsigned long)fatent->u.ent16_p & (2 - 1));
139 if (next >= BAD_FAT16)
140 next = FAT_ENT_EOF;
141 return next;
142 }
143
144 static int fat32_ent_get(struct fat_entry *fatent)
145 {
146 int next = le32_to_cpu(*fatent->u.ent32_p) & 0x0fffffff;
147 WARN_ON((unsigned long)fatent->u.ent32_p & (4 - 1));
148 if (next >= BAD_FAT32)
149 next = FAT_ENT_EOF;
150 return next;
151 }
152
153 static void fat12_ent_put(struct fat_entry *fatent, int new)
154 {
155 u8 **ent12_p = fatent->u.ent12_p;
156
157 if (new == FAT_ENT_EOF)
158 new = EOF_FAT12;
159
160 spin_lock(&fat12_entry_lock);
161 if (fatent->entry & 1) {
162 *ent12_p[0] = (new << 4) | (*ent12_p[0] & 0x0f);
163 *ent12_p[1] = new >> 4;
164 } else {
165 *ent12_p[0] = new & 0xff;
166 *ent12_p[1] = (*ent12_p[1] & 0xf0) | (new >> 8);
167 }
168 spin_unlock(&fat12_entry_lock);
169
170 mark_buffer_dirty(fatent->bhs[0]);
171 if (fatent->nr_bhs == 2)
172 mark_buffer_dirty(fatent->bhs[1]);
173 }
174
175 static void fat16_ent_put(struct fat_entry *fatent, int new)
176 {
177 if (new == FAT_ENT_EOF)
178 new = EOF_FAT16;
179
180 *fatent->u.ent16_p = cpu_to_le16(new);
181 mark_buffer_dirty(fatent->bhs[0]);
182 }
183
184 static void fat32_ent_put(struct fat_entry *fatent, int new)
185 {
186 if (new == FAT_ENT_EOF)
187 new = EOF_FAT32;
188
189 WARN_ON(new & 0xf0000000);
190 new |= le32_to_cpu(*fatent->u.ent32_p) & ~0x0fffffff;
191 *fatent->u.ent32_p = cpu_to_le32(new);
192 mark_buffer_dirty(fatent->bhs[0]);
193 }
194
195 static int fat12_ent_next(struct fat_entry *fatent)
196 {
197 u8 **ent12_p = fatent->u.ent12_p;
198 struct buffer_head **bhs = fatent->bhs;
199 u8 *nextp = ent12_p[1] + 1 + (fatent->entry & 1);
200
201 fatent->entry++;
202 if (fatent->nr_bhs == 1) {
203 WARN_ON(ent12_p[0] > (u8 *)(bhs[0]->b_data + (bhs[0]->b_size - 2)));
204 WARN_ON(ent12_p[1] > (u8 *)(bhs[0]->b_data + (bhs[0]->b_size - 1)));
205 if (nextp < (u8 *)(bhs[0]->b_data + (bhs[0]->b_size - 1))) {
206 ent12_p[0] = nextp - 1;
207 ent12_p[1] = nextp;
208 return 1;
209 }
210 } else {
211 WARN_ON(ent12_p[0] != (u8 *)(bhs[0]->b_data + (bhs[0]->b_size - 1)));
212 WARN_ON(ent12_p[1] != (u8 *)bhs[1]->b_data);
213 ent12_p[0] = nextp - 1;
214 ent12_p[1] = nextp;
215 brelse(bhs[0]);
216 bhs[0] = bhs[1];
217 fatent->nr_bhs = 1;
218 return 1;
219 }
220 ent12_p[0] = NULL;
221 ent12_p[1] = NULL;
222 return 0;
223 }
224
225 static int fat16_ent_next(struct fat_entry *fatent)
226 {
227 const struct buffer_head *bh = fatent->bhs[0];
228 fatent->entry++;
229 if (fatent->u.ent16_p < (__le16 *)(bh->b_data + (bh->b_size - 2))) {
230 fatent->u.ent16_p++;
231 return 1;
232 }
233 fatent->u.ent16_p = NULL;
234 return 0;
235 }
236
237 static int fat32_ent_next(struct fat_entry *fatent)
238 {
239 const struct buffer_head *bh = fatent->bhs[0];
240 fatent->entry++;
241 if (fatent->u.ent32_p < (__le32 *)(bh->b_data + (bh->b_size - 4))) {
242 fatent->u.ent32_p++;
243 return 1;
244 }
245 fatent->u.ent32_p = NULL;
246 return 0;
247 }
248
249 static struct fatent_operations fat12_ops = {
250 .ent_blocknr = fat12_ent_blocknr,
251 .ent_set_ptr = fat12_ent_set_ptr,
252 .ent_bread = fat12_ent_bread,
253 .ent_get = fat12_ent_get,
254 .ent_put = fat12_ent_put,
255 .ent_next = fat12_ent_next,
256 };
257
258 static struct fatent_operations fat16_ops = {
259 .ent_blocknr = fat_ent_blocknr,
260 .ent_set_ptr = fat16_ent_set_ptr,
261 .ent_bread = fat_ent_bread,
262 .ent_get = fat16_ent_get,
263 .ent_put = fat16_ent_put,
264 .ent_next = fat16_ent_next,
265 };
266
267 static struct fatent_operations fat32_ops = {
268 .ent_blocknr = fat_ent_blocknr,
269 .ent_set_ptr = fat32_ent_set_ptr,
270 .ent_bread = fat_ent_bread,
271 .ent_get = fat32_ent_get,
272 .ent_put = fat32_ent_put,
273 .ent_next = fat32_ent_next,
274 };
275
276 static inline void lock_fat(struct msdos_sb_info *sbi)
277 {
278 mutex_lock(&sbi->fat_lock);
279 }
280
281 static inline void unlock_fat(struct msdos_sb_info *sbi)
282 {
283 mutex_unlock(&sbi->fat_lock);
284 }
285
286 void fat_ent_access_init(struct super_block *sb)
287 {
288 struct msdos_sb_info *sbi = MSDOS_SB(sb);
289
290 mutex_init(&sbi->fat_lock);
291
292 switch (sbi->fat_bits) {
293 case 32:
294 sbi->fatent_shift = 2;
295 sbi->fatent_ops = &fat32_ops;
296 break;
297 case 16:
298 sbi->fatent_shift = 1;
299 sbi->fatent_ops = &fat16_ops;
300 break;
301 case 12:
302 sbi->fatent_shift = -1;
303 sbi->fatent_ops = &fat12_ops;
304 break;
305 }
306 }
307
308 static inline int fat_ent_update_ptr(struct super_block *sb,
309 struct fat_entry *fatent,
310 int offset, sector_t blocknr)
311 {
312 struct msdos_sb_info *sbi = MSDOS_SB(sb);
313 struct fatent_operations *ops = sbi->fatent_ops;
314 struct buffer_head **bhs = fatent->bhs;
315
316 /* Is this fatent's blocks including this entry? */
317 if (!fatent->nr_bhs || bhs[0]->b_blocknr != blocknr)
318 return 0;
319 /* Does this entry need the next block? */
320 if (sbi->fat_bits == 12 && (offset + 1) >= sb->s_blocksize) {
321 if (fatent->nr_bhs != 2 || bhs[1]->b_blocknr != (blocknr + 1))
322 return 0;
323 }
324 ops->ent_set_ptr(fatent, offset);
325 return 1;
326 }
327
328 int fat_ent_read(struct inode *inode, struct fat_entry *fatent, int entry)
329 {
330 struct super_block *sb = inode->i_sb;
331 struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
332 struct fatent_operations *ops = sbi->fatent_ops;
333 int err, offset;
334 sector_t blocknr;
335
336 if (entry < FAT_START_ENT || sbi->max_cluster <= entry) {
337 fatent_brelse(fatent);
338 fat_fs_panic(sb, "invalid access to FAT (entry 0x%08x)", entry);
339 return -EIO;
340 }
341
342 fatent_set_entry(fatent, entry);
343 ops->ent_blocknr(sb, entry, &offset, &blocknr);
344
345 if (!fat_ent_update_ptr(sb, fatent, offset, blocknr)) {
346 fatent_brelse(fatent);
347 err = ops->ent_bread(sb, fatent, offset, blocknr);
348 if (err)
349 return err;
350 }
351 return ops->ent_get(fatent);
352 }
353
354 /* FIXME: We can write the blocks as more big chunk. */
355 static int fat_mirror_bhs(struct super_block *sb, struct buffer_head **bhs,
356 int nr_bhs)
357 {
358 struct msdos_sb_info *sbi = MSDOS_SB(sb);
359 struct buffer_head *c_bh;
360 int err, n, copy;
361
362 err = 0;
363 for (copy = 1; copy < sbi->fats; copy++) {
364 sector_t backup_fat = sbi->fat_length * copy;
365
366 for (n = 0; n < nr_bhs; n++) {
367 c_bh = sb_getblk(sb, backup_fat + bhs[n]->b_blocknr);
368 if (!c_bh) {
369 err = -ENOMEM;
370 goto error;
371 }
372 memcpy(c_bh->b_data, bhs[n]->b_data, sb->s_blocksize);
373 set_buffer_uptodate(c_bh);
374 mark_buffer_dirty(c_bh);
375 if (sb->s_flags & MS_SYNCHRONOUS)
376 err = sync_dirty_buffer(c_bh);
377 brelse(c_bh);
378 if (err)
379 goto error;
380 }
381 }
382 error:
383 return err;
384 }
385
386 int fat_ent_write(struct inode *inode, struct fat_entry *fatent,
387 int new, int wait)
388 {
389 struct super_block *sb = inode->i_sb;
390 struct fatent_operations *ops = MSDOS_SB(sb)->fatent_ops;
391 int err;
392
393 ops->ent_put(fatent, new);
394 if (wait) {
395 err = fat_sync_bhs(fatent->bhs, fatent->nr_bhs);
396 if (err)
397 return err;
398 }
399 return fat_mirror_bhs(sb, fatent->bhs, fatent->nr_bhs);
400 }
401
402 static inline int fat_ent_next(struct msdos_sb_info *sbi,
403 struct fat_entry *fatent)
404 {
405 if (sbi->fatent_ops->ent_next(fatent)) {
406 if (fatent->entry < sbi->max_cluster)
407 return 1;
408 }
409 return 0;
410 }
411
412 static inline int fat_ent_read_block(struct super_block *sb,
413 struct fat_entry *fatent)
414 {
415 struct fatent_operations *ops = MSDOS_SB(sb)->fatent_ops;
416 sector_t blocknr;
417 int offset;
418
419 fatent_brelse(fatent);
420 ops->ent_blocknr(sb, fatent->entry, &offset, &blocknr);
421 return ops->ent_bread(sb, fatent, offset, blocknr);
422 }
423
424 static void fat_collect_bhs(struct buffer_head **bhs, int *nr_bhs,
425 struct fat_entry *fatent)
426 {
427 int n, i;
428
429 for (n = 0; n < fatent->nr_bhs; n++) {
430 for (i = 0; i < *nr_bhs; i++) {
431 if (fatent->bhs[n] == bhs[i])
432 break;
433 }
434 if (i == *nr_bhs) {
435 get_bh(fatent->bhs[n]);
436 bhs[i] = fatent->bhs[n];
437 (*nr_bhs)++;
438 }
439 }
440 }
441
442 int fat_alloc_clusters(struct inode *inode, int *cluster, int nr_cluster)
443 {
444 struct super_block *sb = inode->i_sb;
445 struct msdos_sb_info *sbi = MSDOS_SB(sb);
446 struct fatent_operations *ops = sbi->fatent_ops;
447 struct fat_entry fatent, prev_ent;
448 struct buffer_head *bhs[MAX_BUF_PER_PAGE];
449 int i, count, err, nr_bhs, idx_clus;
450
451 BUG_ON(nr_cluster > (MAX_BUF_PER_PAGE / 2)); /* fixed limit */
452
453 lock_fat(sbi);
454 if (sbi->free_clusters != -1 && sbi->free_clus_valid &&
455 sbi->free_clusters < nr_cluster) {
456 unlock_fat(sbi);
457 return -ENOSPC;
458 }
459
460 err = nr_bhs = idx_clus = 0;
461 count = FAT_START_ENT;
462 fatent_init(&prev_ent);
463 fatent_init(&fatent);
464 fatent_set_entry(&fatent, sbi->prev_free + 1);
465 while (count < sbi->max_cluster) {
466 if (fatent.entry >= sbi->max_cluster)
467 fatent.entry = FAT_START_ENT;
468 fatent_set_entry(&fatent, fatent.entry);
469 err = fat_ent_read_block(sb, &fatent);
470 if (err)
471 goto out;
472
473 /* Find the free entries in a block */
474 do {
475 if (ops->ent_get(&fatent) == FAT_ENT_FREE) {
476 int entry = fatent.entry;
477
478 /* make the cluster chain */
479 ops->ent_put(&fatent, FAT_ENT_EOF);
480 if (prev_ent.nr_bhs)
481 ops->ent_put(&prev_ent, entry);
482
483 fat_collect_bhs(bhs, &nr_bhs, &fatent);
484
485 sbi->prev_free = entry;
486 if (sbi->free_clusters != -1)
487 sbi->free_clusters--;
488 sb->s_dirt = 1;
489
490 cluster[idx_clus] = entry;
491 idx_clus++;
492 if (idx_clus == nr_cluster)
493 goto out;
494
495 /*
496 * fat_collect_bhs() gets ref-count of bhs,
497 * so we can still use the prev_ent.
498 */
499 prev_ent = fatent;
500 }
501 count++;
502 if (count == sbi->max_cluster)
503 break;
504 } while (fat_ent_next(sbi, &fatent));
505 }
506
507 /* Couldn't allocate the free entries */
508 sbi->free_clusters = 0;
509 sbi->free_clus_valid = 1;
510 sb->s_dirt = 1;
511 err = -ENOSPC;
512
513 out:
514 unlock_fat(sbi);
515 fatent_brelse(&fatent);
516 if (!err) {
517 if (inode_needs_sync(inode))
518 err = fat_sync_bhs(bhs, nr_bhs);
519 if (!err)
520 err = fat_mirror_bhs(sb, bhs, nr_bhs);
521 }
522 for (i = 0; i < nr_bhs; i++)
523 brelse(bhs[i]);
524
525 if (err && idx_clus)
526 fat_free_clusters(inode, cluster[0]);
527
528 return err;
529 }
530
531 int fat_free_clusters(struct inode *inode, int cluster)
532 {
533 struct super_block *sb = inode->i_sb;
534 struct msdos_sb_info *sbi = MSDOS_SB(sb);
535 struct fatent_operations *ops = sbi->fatent_ops;
536 struct fat_entry fatent;
537 struct buffer_head *bhs[MAX_BUF_PER_PAGE];
538 int i, err, nr_bhs;
539 int first_cl = cluster;
540
541 nr_bhs = 0;
542 fatent_init(&fatent);
543 lock_fat(sbi);
544 do {
545 cluster = fat_ent_read(inode, &fatent, cluster);
546 if (cluster < 0) {
547 err = cluster;
548 goto error;
549 } else if (cluster == FAT_ENT_FREE) {
550 fat_fs_panic(sb, "%s: deleting FAT entry beyond EOF",
551 __func__);
552 err = -EIO;
553 goto error;
554 }
555
556 /*
557 * Issue discard for the sectors we no longer care about,
558 * batching contiguous clusters into one request
559 */
560 if (cluster != fatent.entry + 1) {
561 int nr_clus = fatent.entry - first_cl + 1;
562
563 sb_issue_discard(sb, fat_clus_to_blknr(sbi, first_cl),
564 nr_clus * sbi->sec_per_clus);
565 first_cl = cluster;
566 }
567
568 ops->ent_put(&fatent, FAT_ENT_FREE);
569 if (sbi->free_clusters != -1) {
570 sbi->free_clusters++;
571 sb->s_dirt = 1;
572 }
573
574 if (nr_bhs + fatent.nr_bhs > MAX_BUF_PER_PAGE) {
575 if (sb->s_flags & MS_SYNCHRONOUS) {
576 err = fat_sync_bhs(bhs, nr_bhs);
577 if (err)
578 goto error;
579 }
580 err = fat_mirror_bhs(sb, bhs, nr_bhs);
581 if (err)
582 goto error;
583 for (i = 0; i < nr_bhs; i++)
584 brelse(bhs[i]);
585 nr_bhs = 0;
586 }
587 fat_collect_bhs(bhs, &nr_bhs, &fatent);
588 } while (cluster != FAT_ENT_EOF);
589
590 if (sb->s_flags & MS_SYNCHRONOUS) {
591 err = fat_sync_bhs(bhs, nr_bhs);
592 if (err)
593 goto error;
594 }
595 err = fat_mirror_bhs(sb, bhs, nr_bhs);
596 error:
597 fatent_brelse(&fatent);
598 for (i = 0; i < nr_bhs; i++)
599 brelse(bhs[i]);
600 unlock_fat(sbi);
601
602 return err;
603 }
604
605 EXPORT_SYMBOL_GPL(fat_free_clusters);
606
607 /* 128kb is the whole sectors for FAT12 and FAT16 */
608 #define FAT_READA_SIZE (128 * 1024)
609
610 static void fat_ent_reada(struct super_block *sb, struct fat_entry *fatent,
611 unsigned long reada_blocks)
612 {
613 struct fatent_operations *ops = MSDOS_SB(sb)->fatent_ops;
614 sector_t blocknr;
615 int i, offset;
616
617 ops->ent_blocknr(sb, fatent->entry, &offset, &blocknr);
618
619 for (i = 0; i < reada_blocks; i++)
620 sb_breadahead(sb, blocknr + i);
621 }
622
623 int fat_count_free_clusters(struct super_block *sb)
624 {
625 struct msdos_sb_info *sbi = MSDOS_SB(sb);
626 struct fatent_operations *ops = sbi->fatent_ops;
627 struct fat_entry fatent;
628 unsigned long reada_blocks, reada_mask, cur_block;
629 int err = 0, free;
630
631 lock_fat(sbi);
632 if (sbi->free_clusters != -1 && sbi->free_clus_valid)
633 goto out;
634
635 reada_blocks = FAT_READA_SIZE >> sb->s_blocksize_bits;
636 reada_mask = reada_blocks - 1;
637 cur_block = 0;
638
639 free = 0;
640 fatent_init(&fatent);
641 fatent_set_entry(&fatent, FAT_START_ENT);
642 while (fatent.entry < sbi->max_cluster) {
643 /* readahead of fat blocks */
644 if ((cur_block & reada_mask) == 0) {
645 unsigned long rest = sbi->fat_length - cur_block;
646 fat_ent_reada(sb, &fatent, min(reada_blocks, rest));
647 }
648 cur_block++;
649
650 err = fat_ent_read_block(sb, &fatent);
651 if (err)
652 goto out;
653
654 do {
655 if (ops->ent_get(&fatent) == FAT_ENT_FREE)
656 free++;
657 } while (fat_ent_next(sbi, &fatent));
658 }
659 sbi->free_clusters = free;
660 sbi->free_clus_valid = 1;
661 sb->s_dirt = 1;
662 fatent_brelse(&fatent);
663 out:
664 unlock_fat(sbi);
665 return err;
666 }
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