This source file includes following definitions.
- ext2_put_inode
- ext2_put_super
- convert_pre_02b_fs
- ext2_read_super
- ext2_commit_super
- ext2_write_super
- ext2_remount
- ext2_statfs
- block_bmap
- ext2_bmap
- inode_getblk
- block_getblk
- ext2_getblk
- ext2_bread
- ext2_read_inode
- ext2_update_inode
- ext2_write_inode
- ext2_sync_inode
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15 #include <linux/sched.h>
16 #include <linux/ext2_fs.h>
17 #include <linux/kernel.h>
18 #include <linux/mm.h>
19 #include <linux/string.h>
20 #include <linux/stat.h>
21 #include <linux/locks.h>
22 #include <linux/errno.h>
23
24 #include <asm/system.h>
25 #include <asm/segment.h>
26
27 void ext2_put_inode (struct inode * inode)
28 {
29 if (inode->i_nlink || inode->i_ino == EXT2_ACL_IDX_INO ||
30 inode->i_ino == EXT2_ACL_DATA_INO)
31 return;
32 inode->i_size = 0;
33 if (inode->i_blocks)
34 ext2_truncate (inode);
35 ext2_free_inode (inode);
36 }
37
38 void ext2_put_super (struct super_block * sb)
39 {
40 struct ext2_super_block * es;
41 int i;
42
43 lock_super (sb);
44 es = (struct ext2_super_block *) sb->u.ext2_sb.s_sbh->b_data;
45 es->s_valid = sb->u.ext2_sb.s_was_mounted_valid;
46 sb->u.ext2_sb.s_sbh->b_dirt = 1;
47 #ifndef DONT_USE_DCACHE
48 ext2_dcache_invalidate (sb->s_dev);
49 #endif
50 sb->s_dev = 0;
51 for (i = 0; i < EXT2_MAX_GROUP_DESC; i++)
52 if (sb->u.ext2_sb.s_group_desc[i])
53 brelse (sb->u.ext2_sb.s_group_desc[i]);
54 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
55 if (sb->u.ext2_sb.s_inode_bitmap[i])
56 brelse (sb->u.ext2_sb.s_inode_bitmap[i]);
57 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
58 if (sb->u.ext2_sb.s_block_bitmap[i])
59 brelse (sb->u.ext2_sb.s_block_bitmap[i]);
60 unlock_super (sb);
61 return;
62 }
63
64 static struct super_operations ext2_sops = {
65 ext2_read_inode,
66 NULL,
67 ext2_write_inode,
68 ext2_put_inode,
69 ext2_put_super,
70 ext2_write_super,
71 ext2_statfs,
72 ext2_remount
73 };
74
75 #ifdef EXT2FS_PRE_02B_COMPAT
76
77 static int convert_pre_02b_fs (struct super_block * sb,
78 struct buffer_head * bh)
79 {
80 struct ext2_super_block * es;
81 struct ext2_old_group_desc old_group_desc [BLOCK_SIZE / sizeof (struct ext2_old_group_desc)];
82 struct ext2_group_desc * gdp;
83 struct buffer_head * bh2;
84 int groups_count;
85 int i;
86
87 es = (struct ext2_super_block *) bh->b_data;
88 bh2 = bread (sb->s_dev, 2, BLOCK_SIZE);
89 if (!bh2) {
90 printk ("Cannot read descriptor blocks while converting !\n");
91 return 0;
92 }
93 memcpy (old_group_desc, bh2->b_data, BLOCK_SIZE);
94 groups_count = (sb->u.ext2_sb.s_blocks_count -
95 sb->u.ext2_sb.s_first_data_block +
96 (EXT2_BLOCK_SIZE(sb) * 8) - 1) /
97 (EXT2_BLOCK_SIZE(sb) * 8);
98 memset (bh2->b_data, 0, BLOCK_SIZE);
99 gdp = (struct ext2_group_desc *) bh2->b_data;
100 for (i = 0; i < groups_count; i++) {
101 gdp[i].bg_block_bitmap = old_group_desc[i].bg_block_bitmap;
102 gdp[i].bg_inode_bitmap = old_group_desc[i].bg_inode_bitmap;
103 gdp[i].bg_inode_table = old_group_desc[i].bg_inode_table;
104 gdp[i].bg_free_blocks_count = old_group_desc[i].bg_free_blocks_count;
105 gdp[i].bg_free_inodes_count = old_group_desc[i].bg_free_inodes_count;
106 }
107 bh2->b_dirt = 1;
108 brelse (bh2);
109 es->s_magic = EXT2_SUPER_MAGIC;
110 bh->b_dirt = 1;
111 sb->s_magic = EXT2_SUPER_MAGIC;
112 return 1;
113 }
114
115 #endif
116
117 struct super_block * ext2_read_super (struct super_block * s, void * data,
118 int silent)
119 {
120 struct buffer_head * bh;
121 struct ext2_super_block * es;
122 int dev = s->s_dev;
123 int bh_count;
124 int i, j;
125 #ifdef EXT2FS_PRE_02B_COMPAT
126 int fs_converted = 0;
127 #endif
128
129 lock_super (s);
130 if (!(bh = bread (dev, 1, BLOCK_SIZE))) {
131 s->s_dev = 0;
132 unlock_super (s);
133 printk ("EXT2-fs: unable to read superblock\n");
134 return NULL;
135 }
136 es = (struct ext2_super_block *) bh->b_data;
137 s->s_magic = es->s_magic;
138 s->s_blocksize = EXT2_MIN_BLOCK_SIZE << es->s_log_block_size;
139 s->u.ext2_sb.s_inodes_count = es->s_inodes_count;
140 s->u.ext2_sb.s_blocks_count = es->s_blocks_count;
141 s->u.ext2_sb.s_r_blocks_count = es->s_r_blocks_count;
142 s->u.ext2_sb.s_first_data_block = es->s_first_data_block;
143 s->u.ext2_sb.s_log_block_size = es->s_log_block_size;
144 s->u.ext2_sb.s_log_frag_size = es->s_log_frag_size;
145 s->u.ext2_sb.s_frag_size = EXT2_MIN_FRAG_SIZE <<
146 es->s_log_frag_size;
147 if (s->u.ext2_sb.s_frag_size)
148 s->u.ext2_sb.s_frags_per_block = s->s_blocksize /
149 s->u.ext2_sb.s_frag_size;
150 else
151 s->s_magic = 0;
152 s->u.ext2_sb.s_blocks_per_group = es->s_blocks_per_group;
153 s->u.ext2_sb.s_frags_per_group = es->s_frags_per_group;
154 s->u.ext2_sb.s_inodes_per_group = es->s_inodes_per_group;
155 s->u.ext2_sb.s_inodes_per_block = s->s_blocksize /
156 sizeof (struct ext2_inode);
157 s->u.ext2_sb.s_desc_per_block = s->s_blocksize /
158 sizeof (struct ext2_group_desc);
159 s->u.ext2_sb.s_sbh = bh;
160 s->u.ext2_sb.s_was_mounted_valid = es->s_valid;
161 s->u.ext2_sb.s_rename_lock = 0;
162 s->u.ext2_sb.s_rename_wait = NULL;
163 #ifdef EXT2FS_PRE_02B_COMPAT
164 if (s->s_magic == EXT2_OLD_SUPER_MAGIC) {
165 if (es->s_blocks_count > 262144) {
166
167 s->s_dev = 0;
168 unlock_super (s);
169 brelse (bh);
170 printk ("EXT2-fs: trying to mount a pre-0.2b file"
171 "system which cannot be converted\n");
172 return NULL;
173 }
174 printk ("EXT2-fs: mounting a pre 0.2b file system, "
175 "will try to convert the structure\n");
176 if (s->s_flags & MS_RDONLY == 0) {
177 s->s_dev = 0;
178 unlock_super (s);
179 brelse (bh);
180 printk ("EXT2-fs: cannot convert a read-only fs\n");
181 return NULL;
182 }
183 if (!convert_pre_02b_fs (s, bh)) {
184 s->s_dev = 0;
185 unlock_super (s);
186 brelse (bh);
187 printk ("EXT2-fs: conversion failed !!!\n");
188 return NULL;
189 }
190 printk ("EXT2-fs: conversion succeeded !!!\n");
191 fs_converted = 1;
192 }
193 #endif
194 if (s->s_magic != EXT2_SUPER_MAGIC) {
195 s->s_dev = 0;
196 unlock_super (s);
197 brelse (bh);
198 if (!silent)
199 printk("VFS: Can't find an ext2fs filesystem on dev 0x%04x.\n",
200 dev);
201 return NULL;
202 }
203 if (s->s_blocksize != s->u.ext2_sb.s_frag_size) {
204 s->s_dev = 0;
205 unlock_super (s);
206 brelse (bh);
207 printk ("EXT2-fs: fragsize != blocksize (not supported yet)\n");
208 return NULL;
209 }
210 if (!es->s_valid)
211 printk ("EXT2-fs warning: mounting unchecked file system, "
212 "running e2fsck is recommended\n");
213 s->u.ext2_sb.s_groups_count = (s->u.ext2_sb.s_blocks_count -
214 s->u.ext2_sb.s_first_data_block +
215 EXT2_BLOCKS_PER_GROUP(s) - 1) /
216 EXT2_BLOCKS_PER_GROUP(s);
217 for (i = 0; i < EXT2_MAX_GROUP_DESC; i++)
218 s->u.ext2_sb.s_group_desc[i] = NULL;
219 bh_count = (s->u.ext2_sb.s_groups_count +
220 EXT2_DESC_PER_BLOCK(s) - 1) /
221 EXT2_DESC_PER_BLOCK(s);
222 if (bh_count >= EXT2_MAX_GROUP_DESC) {
223 s->s_dev = 0;
224 unlock_super (s);
225 brelse (bh);
226 printk ("EXT2-fs: Too big file system\n");
227 return NULL;
228 }
229 for (i = 0; i < bh_count; i++) {
230 s->u.ext2_sb.s_group_desc[i] = bread (dev, i + 2, s->s_blocksize);
231 if (!s->u.ext2_sb.s_group_desc[i]) {
232 s->s_dev = 0;
233 unlock_super (s);
234 for (j = 0; j < i; j++)
235 brelse (s->u.ext2_sb.s_group_desc[i]);
236 brelse (bh);
237 printk ("ext2_read_super: unable to read group descriptors\n");
238 return NULL;
239 }
240 }
241 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++) {
242 s->u.ext2_sb.s_inode_bitmap_number[i] = 0;
243 s->u.ext2_sb.s_inode_bitmap[i] = NULL;
244 s->u.ext2_sb.s_block_bitmap_number[i] = 0;
245 s->u.ext2_sb.s_block_bitmap[i] = NULL;
246 }
247 s->u.ext2_sb.s_loaded_inode_bitmaps = 0;
248 s->u.ext2_sb.s_loaded_block_bitmaps = 0;
249 unlock_super (s);
250
251 s->s_dev = dev;
252 s->s_op = &ext2_sops;
253 if (!(s->s_mounted = iget(s, EXT2_ROOT_INO))) {
254 s->s_dev = 0;
255 for (i = 0; i < EXT2_MAX_GROUP_DESC; i++)
256 if (s->u.ext2_sb.s_group_desc[i])
257 brelse (s->u.ext2_sb.s_group_desc[i]);
258 brelse (bh);
259 printk ("EXT2-fs: get root inode failed\n");
260 return NULL;
261 }
262 if ((s->s_flags & MS_RDONLY) == 0) {
263 es->s_valid = 0;
264 es->s_mtime = CURRENT_TIME;
265 bh->b_dirt = 1;
266 s->s_dirt = 1;
267 }
268 #ifdef EXT2FS_PRE_02B_COMPAT
269 if (fs_converted) {
270 for (i = 0; i < bh_count; i++)
271 s->u.ext2_sb.s_group_desc[i]->b_dirt = 1;
272 s->s_dirt = 1;
273 }
274 #endif
275 printk ("[EXT II FS %s, %s, bs=%d, fs=%d, gc=%d, bpg=%d, ipg=%d]\n",
276 EXT2FS_VERSION, EXT2FS_DATE, s->s_blocksize,
277 s->u.ext2_sb.s_frag_size, s->u.ext2_sb.s_groups_count,
278 EXT2_BLOCKS_PER_GROUP(s), EXT2_INODES_PER_GROUP(s));
279 return s;
280 }
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296 static void ext2_commit_super (struct super_block *sb,
297 struct ext2_super_block *es)
298 {
299 struct buffer_head * bh;
300 unsigned long block;
301 unsigned long bh_count;
302 int i, j;
303
304 es->s_wtime = CURRENT_TIME;
305 sb->u.ext2_sb.s_sbh->b_dirt = 1;
306 bh_count = (sb->u.ext2_sb.s_groups_count +
307 EXT2_DESC_PER_BLOCK(sb) - 1) /
308 EXT2_DESC_PER_BLOCK(sb);
309 for (i = 0; i < sb->u.ext2_sb.s_groups_count; i++) {
310 block = sb->u.ext2_sb.s_first_data_block +
311 i * sb->u.ext2_sb.s_blocks_per_group;
312 if (!(bh = bread (sb->s_dev, block, BLOCK_SIZE)))
313 printk ("ext2_commit_super: Unable to read backup super block for group %d\n", i);
314 else {
315 #ifdef EXT2FS_DEBUG
316 printk ("ext2_commit_super: writing super block backup in group %d at block %d\n", i, block);
317 #endif
318 memcpy (bh->b_data, es, BLOCK_SIZE);
319 bh ->b_dirt = 1;
320 brelse (bh);
321 }
322 for (j = 0; j < bh_count; j++) {
323 block ++;
324 #ifdef EXT2FS_DEBUG
325 printk ("ext2_commit_super: writing descriptors (block %d) backup in group %d at block %d\n", j, i, block);
326 #endif
327 if (!(bh = bread (sb->s_dev, block, sb->s_blocksize)))
328 printk ("ext2_commit_super: Unable to read backup descriptor for group %d\n", i);
329 else {
330 memcpy (bh->b_data, sb->u.ext2_sb.s_group_desc[j]->b_data, sb->s_blocksize);
331 bh ->b_dirt = 1;
332 brelse (bh);
333 }
334 }
335 }
336 sb->s_dirt = 0;
337 }
338
339 void ext2_write_super (struct super_block * sb)
340 {
341 struct ext2_super_block * es;
342
343 if ((sb->s_flags & MS_RDONLY) == 0) {
344 es = (struct ext2_super_block *) sb->u.ext2_sb.s_sbh->b_data;
345 #ifdef EXT2FS_DEBUG
346 printk ("ext2_write_super: setting valid to 0\n");
347 #endif
348 es->s_valid = 0;
349 ext2_commit_super (sb, es);
350 }
351 sb->s_dirt = 0;
352 }
353
354 int ext2_remount(struct super_block *sb, int *flags)
355 {
356 struct ext2_super_block * es;
357
358 es = (struct ext2_super_block *) sb->u.ext2_sb.s_sbh->b_data;
359 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
360 return 0;
361 if (*flags & MS_RDONLY) {
362 if (es->s_valid || !sb->u.ext2_sb.s_was_mounted_valid)
363 return 0;
364
365
366
367 sb->s_flags |= MS_RDONLY;
368 es->s_valid = sb->u.ext2_sb.s_was_mounted_valid;
369 ext2_commit_super(sb, es);
370 }
371 else {
372
373
374
375 sb->u.ext2_sb.s_was_mounted_valid = es->s_valid;
376 }
377 return 0;
378 }
379
380 void ext2_statfs (struct super_block * sb, struct statfs * buf)
381 {
382 long tmp;
383
384 put_fs_long (EXT2_SUPER_MAGIC, &buf->f_type);
385 put_fs_long (sb->s_blocksize, &buf->f_bsize);
386 put_fs_long (sb->u.ext2_sb.s_blocks_count << sb->u.ext2_sb.s_log_block_size,
387 &buf->f_blocks);
388 tmp = ext2_count_free_blocks (sb);
389 put_fs_long (tmp, &buf->f_bfree);
390 if (tmp >= sb->u.ext2_sb.s_r_blocks_count)
391 put_fs_long (tmp - sb->u.ext2_sb.s_r_blocks_count,
392 &buf->f_bavail);
393 else
394 put_fs_long (0, &buf->f_bavail);
395 put_fs_long (sb->u.ext2_sb.s_inodes_count, &buf->f_files);
396 put_fs_long (ext2_count_free_inodes(sb), &buf->f_ffree);
397 put_fs_long (EXT2_NAME_LEN, &buf->f_namelen);
398
399 }
400
401 #define inode_bmap(inode, nr) ((inode)->u.ext2_i.i_data[(nr)])
402
403 static int block_bmap (struct buffer_head * bh, int nr)
404 {
405 int tmp;
406
407 if (!bh)
408 return 0;
409 tmp = ((unsigned long *) bh->b_data)[nr];
410 brelse (bh);
411 return tmp;
412 }
413
414 int ext2_bmap (struct inode * inode, int block)
415 {
416 int i;
417 int addr_per_block = EXT2_ADDR_PER_BLOCK(inode->i_sb);
418
419 if (block < 0) {
420 printk("ext2_bmap: block < 0");
421 return 0;
422 }
423 if (block >= EXT2_NDIR_BLOCKS + addr_per_block +
424 addr_per_block * addr_per_block +
425 addr_per_block * addr_per_block * addr_per_block) {
426 printk ("ext2_bmap: block > big");
427 return 0;
428 }
429 if (block < EXT2_NDIR_BLOCKS)
430 return inode_bmap (inode, block);
431 block -= EXT2_NDIR_BLOCKS;
432 if (block < addr_per_block) {
433 i = inode_bmap (inode, EXT2_IND_BLOCK);
434 if (!i)
435 return 0;
436 return block_bmap (bread (inode->i_dev, i,
437 inode->i_sb->s_blocksize), block);
438 }
439 block -= addr_per_block;
440 if (block < addr_per_block * addr_per_block) {
441 i = inode_bmap (inode, EXT2_DIND_BLOCK);
442 if (!i)
443 return 0;
444 i = block_bmap (bread (inode->i_dev, i,
445 inode->i_sb->s_blocksize),
446 block / addr_per_block);
447 if (!i)
448 return 0;
449 return block_bmap (bread (inode->i_dev, i,
450 inode->i_sb->s_blocksize),
451 block & (addr_per_block - 1));
452 }
453 block -= addr_per_block * addr_per_block;
454 i = inode_bmap (inode, EXT2_TIND_BLOCK);
455 if (!i)
456 return 0;
457 i = block_bmap (bread (inode->i_dev, i, inode->i_sb->s_blocksize),
458 block / (addr_per_block * addr_per_block));
459 if (!i)
460 return 0;
461 i = block_bmap (bread (inode->i_dev, i, inode->i_sb->s_blocksize),
462 (block / addr_per_block) & (addr_per_block - 1));
463 if (!i)
464 return 0;
465 return block_bmap (bread (inode->i_dev, i, inode->i_sb->s_blocksize),
466 block & (addr_per_block - 1));
467 }
468
469 static struct buffer_head * inode_getblk (struct inode * inode, int nr,
470 int create, int new_block, int *err)
471 {
472 int tmp, goal = 0;
473 unsigned long * p;
474 struct buffer_head * result;
475 int blocks = inode->i_sb->s_blocksize / 512;
476
477 p = inode->u.ext2_i.i_data + nr;
478 repeat:
479 tmp = *p;
480 if (tmp) {
481 result = getblk (inode->i_dev, tmp, inode->i_sb->s_blocksize);
482 if (tmp == *p)
483 return result;
484 brelse (result);
485 goto repeat;
486 }
487 if (!create || new_block >=
488 (current->rlim[RLIMIT_FSIZE].rlim_cur >>
489 EXT2_BLOCK_SIZE_BITS(inode->i_sb))) {
490 *err = -EFBIG;
491 return NULL;
492 }
493 if (inode->u.ext2_i.i_next_alloc_block == new_block)
494 goal = inode->u.ext2_i.i_next_alloc_goal;
495 #ifdef EXT2FS_DEBUG
496 printk ("ext2 inode_getblk: hint = %d,", goal);
497 #endif
498 if (!goal) {
499 for (tmp = nr-1; tmp>=0; tmp--) {
500 if (inode->u.ext2_i.i_data[tmp]) {
501 goal = inode->u.ext2_i.i_data[tmp];
502 break;
503 }
504 }
505 if (!goal)
506 goal = (inode->u.ext2_i.i_block_group *
507 EXT2_BLOCKS_PER_GROUP(inode->i_sb))
508 + inode->i_sb->u.ext2_sb.s_first_data_block;
509 }
510
511 #ifdef EXT2FS_DEBUG
512 printk (" goal = %d.\n", goal);
513 #endif
514 tmp = ext2_new_block (inode->i_sb, goal);
515 if (!tmp)
516 return NULL;
517 result = getblk (inode->i_dev, tmp, inode->i_sb->s_blocksize);
518 if (*p) {
519 ext2_free_block (inode->i_sb, tmp);
520 brelse (result);
521 goto repeat;
522 }
523 *p = tmp;
524 inode->u.ext2_i.i_next_alloc_block = new_block;
525 inode->u.ext2_i.i_next_alloc_goal = tmp;
526 inode->i_ctime = CURRENT_TIME;
527 inode->i_blocks += blocks;
528 inode->i_dirt = 1;
529 return result;
530 }
531
532 static struct buffer_head * block_getblk (struct inode * inode,
533 struct buffer_head * bh, int nr,
534 int create, int blocksize,
535 int new_block, int *err)
536 {
537 int tmp, goal = 0;
538 unsigned long * p;
539 struct buffer_head * result;
540 int blocks = inode->i_sb->s_blocksize / 512;
541
542 if (!bh)
543 return NULL;
544 if (!bh->b_uptodate) {
545 ll_rw_block (READ, 1, &bh);
546 wait_on_buffer (bh);
547 if (!bh->b_uptodate) {
548 brelse (bh);
549 return NULL;
550 }
551 }
552 p = nr + (unsigned long *) bh->b_data;
553 repeat:
554 tmp = *p;
555 if (tmp) {
556 result = getblk (bh->b_dev, tmp, blocksize);
557 if (tmp == *p) {
558 brelse (bh);
559 return result;
560 }
561 brelse (result);
562 goto repeat;
563 }
564 if (!create || new_block >=
565 (current->rlim[RLIMIT_FSIZE].rlim_cur >>
566 EXT2_BLOCK_SIZE_BITS(inode->i_sb))) {
567 brelse (bh);
568 *err = -EFBIG;
569 return NULL;
570 }
571 if (inode->u.ext2_i.i_next_alloc_block == new_block)
572 goal = inode->u.ext2_i.i_next_alloc_goal;
573 if (!goal) {
574 for (tmp = nr-1; tmp>=0; tmp--) {
575 if (((unsigned long *) bh->b_data)[tmp]) {
576 goal = ((unsigned long *)bh->b_data)[tmp];
577 break;
578 }
579 }
580 if (!goal)
581 goal = bh->b_blocknr+1;
582 }
583 tmp = ext2_new_block (inode->i_sb, goal);
584 if (!tmp) {
585 #ifdef EXT2FS_DEBUG
586 printk ("inode_getblk: ext2_new_block returned 0\n");
587 #endif
588 brelse (bh);
589 return NULL;
590 }
591 result = getblk (bh->b_dev, tmp, blocksize);
592 if (*p) {
593 ext2_free_block (inode->i_sb, tmp);
594 brelse (result);
595 goto repeat;
596 }
597 *p = tmp;
598 bh->b_dirt = 1;
599 inode->i_ctime = CURRENT_TIME;
600 inode->i_blocks += blocks;
601 inode->i_dirt = 1;
602 inode->u.ext2_i.i_next_alloc_block = new_block;
603 inode->u.ext2_i.i_next_alloc_goal = tmp;
604 brelse (bh);
605 return result;
606 }
607
608 struct buffer_head * ext2_getblk (struct inode * inode, int block,
609 int create, int *err)
610 {
611 struct buffer_head * bh;
612 int b;
613 unsigned long addr_per_block = EXT2_ADDR_PER_BLOCK(inode->i_sb);
614
615 *err = -EIO;
616 if (block < 0) {
617 printk ("ext2_getblk: block < 0\n");
618 return NULL;
619 }
620 if (block > EXT2_NDIR_BLOCKS + addr_per_block +
621 addr_per_block * addr_per_block +
622 addr_per_block * addr_per_block * addr_per_block) {
623 printk ("ext2_getblk: block > big\n");
624 return NULL;
625 }
626
627
628
629 #ifdef EXT2FS_DEBUG
630 printk ("ext2_getblk: block %d, next %d, goal %d.\n", block,
631 inode->u.ext2_i.i_next_alloc_block,
632 inode->u.ext2_i.i_next_alloc_goal);
633 #endif
634 if (block == inode->u.ext2_i.i_next_alloc_block + 1) {
635 inode->u.ext2_i.i_next_alloc_block++;
636 inode->u.ext2_i.i_next_alloc_goal++;
637 }
638
639 *err = -ENOSPC;
640 b = block;
641 if (block < EXT2_NDIR_BLOCKS)
642 return inode_getblk (inode, block, create, b, err);
643 block -= EXT2_NDIR_BLOCKS;
644 if (block < addr_per_block) {
645 bh = inode_getblk (inode, EXT2_IND_BLOCK, create, b, err);
646 return block_getblk (inode, bh, block, create,
647 inode->i_sb->s_blocksize, b, err);
648 }
649 block -= addr_per_block;
650 if (block < addr_per_block * addr_per_block) {
651 bh = inode_getblk (inode, EXT2_DIND_BLOCK, create, b, err);
652 bh = block_getblk (inode, bh, block / addr_per_block, create,
653 inode->i_sb->s_blocksize, b, err);
654 return block_getblk (inode, bh, block & (addr_per_block - 1),
655 create, inode->i_sb->s_blocksize, b, err);
656 }
657 block -= addr_per_block * addr_per_block;
658 bh = inode_getblk (inode, EXT2_TIND_BLOCK, create, b, err);
659 bh = block_getblk (inode, bh, block/(addr_per_block * addr_per_block),
660 create, inode->i_sb->s_blocksize, b, err);
661 bh = block_getblk (inode, bh, (block/addr_per_block) & (addr_per_block - 1),
662 create, inode->i_sb->s_blocksize, b, err);
663 return block_getblk (inode, bh, block & (addr_per_block - 1), create,
664 inode->i_sb->s_blocksize, b, err);
665 }
666
667 struct buffer_head * ext2_bread (struct inode * inode, int block,
668 int create, int *err)
669 {
670 struct buffer_head * bh;
671
672 bh = ext2_getblk (inode, block, create, err);
673 if (!bh || bh->b_uptodate)
674 return bh;
675 ll_rw_block (READ, 1, &bh);
676 wait_on_buffer (bh);
677 if (bh->b_uptodate)
678 return bh;
679 brelse (bh);
680 *err = -EIO;
681 return NULL;
682 }
683
684 void ext2_read_inode (struct inode * inode)
685 {
686 struct buffer_head * bh;
687 struct ext2_inode * raw_inode;
688 unsigned long block_group;
689 unsigned long group_desc;
690 unsigned long desc;
691 unsigned long block;
692 struct ext2_group_desc * gdp;
693
694 if ((inode->i_ino != EXT2_ROOT_INO && inode->i_ino != EXT2_ACL_IDX_INO &&
695 inode->i_ino != EXT2_ACL_DATA_INO && inode->i_ino < EXT2_FIRST_INO) ||
696 inode->i_ino > inode->i_sb->u.ext2_sb.s_inodes_count) {
697 printk ("ext2_read_inode: bad inode number of dev %0x04: %d\n",
698 inode->i_dev, inode->i_ino);
699 return;
700 }
701 block_group = (inode->i_ino - 1) / EXT2_INODES_PER_GROUP(inode->i_sb);
702 if (block_group >= inode->i_sb->u.ext2_sb.s_groups_count)
703 panic ("ext2_read_inode: group >= groups count");
704 group_desc = block_group / EXT2_DESC_PER_BLOCK(inode->i_sb);
705 desc = block_group % EXT2_DESC_PER_BLOCK(inode->i_sb);
706 bh = inode->i_sb->u.ext2_sb.s_group_desc[group_desc];
707 if (!bh)
708 panic ("ext2_read_inode: Descriptor not loaded");
709 gdp = (struct ext2_group_desc *) bh->b_data;
710 block = gdp[desc].bg_inode_table +
711 (((inode->i_ino - 1) % EXT2_INODES_PER_GROUP(inode->i_sb))
712 / EXT2_INODES_PER_BLOCK(inode->i_sb));
713 if (!(bh = bread (inode->i_dev, block, inode->i_sb->s_blocksize)))
714 panic ("ext2_read_inode: unable to read i-node block");
715 raw_inode = ((struct ext2_inode *) bh->b_data) +
716 (inode->i_ino - 1) % EXT2_INODES_PER_BLOCK(inode->i_sb);
717 inode->i_mode = raw_inode->i_mode;
718 inode->i_uid = raw_inode->i_uid;
719 inode->i_gid = raw_inode->i_gid;
720 inode->i_nlink = raw_inode->i_links_count;
721 inode->i_size = raw_inode->i_size;
722 inode->i_atime = raw_inode->i_atime;
723 inode->i_ctime = raw_inode->i_ctime;
724 inode->i_mtime = raw_inode->i_mtime;
725 inode->u.ext2_i.i_dtime = raw_inode->i_dtime;
726 inode->i_blksize = inode->i_sb->s_blocksize;
727 inode->i_blocks = raw_inode->i_blocks;
728 inode->u.ext2_i.i_flags = raw_inode->i_flags;
729 inode->u.ext2_i.i_faddr = raw_inode->i_faddr;
730 inode->u.ext2_i.i_frag = raw_inode->i_frag;
731 inode->u.ext2_i.i_fsize = raw_inode->i_fsize;
732 inode->u.ext2_i.i_file_acl = raw_inode->i_file_acl;
733 inode->u.ext2_i.i_dir_acl = raw_inode->i_dir_acl;
734 inode->u.ext2_i.i_version = raw_inode->i_version;
735 inode->u.ext2_i.i_block_group = block_group;
736 inode->u.ext2_i.i_next_alloc_block = 0;
737 inode->u.ext2_i.i_next_alloc_goal = 0;
738 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
739 inode->i_rdev = raw_inode->i_block[0];
740 else for (block = 0; block < EXT2_N_BLOCKS; block++)
741 inode->u.ext2_i.i_data[block] = raw_inode->i_block[block];
742 brelse (bh);
743 inode->i_op = NULL;
744 if (inode->i_ino == EXT2_ACL_IDX_INO ||
745 inode->i_ino == EXT2_ACL_DATA_INO)
746 ;
747 else if (S_ISREG(inode->i_mode))
748 inode->i_op = &ext2_file_inode_operations;
749 else if (S_ISDIR(inode->i_mode))
750 inode->i_op = &ext2_dir_inode_operations;
751 else if (S_ISLNK(inode->i_mode))
752 inode->i_op = &ext2_symlink_inode_operations;
753 else if (S_ISCHR(inode->i_mode))
754 inode->i_op = &chrdev_inode_operations;
755 else if (S_ISBLK(inode->i_mode))
756 inode->i_op = &blkdev_inode_operations;
757 else if (S_ISFIFO(inode->i_mode))
758 init_fifo(inode);
759 }
760
761 static struct buffer_head * ext2_update_inode (struct inode * inode)
762 {
763 struct buffer_head * bh;
764 struct ext2_inode * raw_inode;
765 unsigned long block_group;
766 unsigned long group_desc;
767 unsigned long desc;
768 unsigned long block;
769 struct ext2_group_desc * gdp;
770
771 if ((inode->i_ino != EXT2_ROOT_INO && inode->i_ino < EXT2_FIRST_INO) ||
772 inode->i_ino > inode->i_sb->u.ext2_sb.s_inodes_count) {
773 printk ("ext2_write_inode: bad inode number of dev %0x04: %d\n",
774 inode->i_dev, inode->i_ino);
775 return 0;
776 }
777 block_group = (inode->i_ino - 1) / EXT2_INODES_PER_GROUP(inode->i_sb);
778 if (block_group >= inode->i_sb->u.ext2_sb.s_groups_count)
779 panic ("ext2_write_inode: group >= groups count");
780 group_desc = block_group / EXT2_DESC_PER_BLOCK(inode->i_sb);
781 desc = block_group % EXT2_DESC_PER_BLOCK(inode->i_sb);
782 bh = inode->i_sb->u.ext2_sb.s_group_desc[group_desc];
783 if (!bh)
784 panic ("ext2_write_inode: Descriptor not loaded");
785 gdp = (struct ext2_group_desc *) bh->b_data;
786 block = gdp[desc].bg_inode_table +
787 (((inode->i_ino - 1) % EXT2_INODES_PER_GROUP(inode->i_sb))
788 / EXT2_INODES_PER_BLOCK(inode->i_sb));
789 if (!(bh = bread (inode->i_dev, block, inode->i_sb->s_blocksize)))
790 panic ("ext2_write_inode: unable to read i-node block");
791 raw_inode = ((struct ext2_inode *)bh->b_data) +
792 (inode->i_ino - 1) % EXT2_INODES_PER_BLOCK(inode->i_sb);
793 raw_inode->i_mode = inode->i_mode;
794 raw_inode->i_uid = inode->i_uid;
795 raw_inode->i_gid = inode->i_gid;
796 raw_inode->i_links_count = inode->i_nlink;
797 raw_inode->i_size = inode->i_size;
798 raw_inode->i_atime = inode->i_atime;
799 raw_inode->i_ctime = inode->i_ctime;
800 raw_inode->i_mtime = inode->i_mtime;
801 raw_inode->i_blocks = inode->i_blocks;
802 raw_inode->i_dtime = inode->u.ext2_i.i_dtime;
803 raw_inode->i_flags = inode->u.ext2_i.i_flags;
804 raw_inode->i_faddr = inode->u.ext2_i.i_faddr;
805 raw_inode->i_frag = inode->u.ext2_i.i_frag;
806 raw_inode->i_fsize = inode->u.ext2_i.i_fsize;
807 raw_inode->i_file_acl = inode->u.ext2_i.i_file_acl;
808 raw_inode->i_dir_acl = inode->u.ext2_i.i_dir_acl;
809 raw_inode->i_version = inode->u.ext2_i.i_version;
810 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
811 raw_inode->i_block[0] = inode->i_rdev;
812 else for (block = 0; block < EXT2_N_BLOCKS; block++)
813 raw_inode->i_block[block] = inode->u.ext2_i.i_data[block];
814 bh->b_dirt = 1;
815 inode->i_dirt = 0;
816 return bh;
817 }
818
819 void ext2_write_inode (struct inode * inode)
820 {
821 struct buffer_head * bh;
822 bh = ext2_update_inode(inode);
823 brelse (bh);
824 }
825
826 int ext2_sync_inode (struct inode *inode)
827 {
828 int err = 0;
829 struct buffer_head *bh;
830
831 bh = ext2_update_inode(inode);
832 if (bh && bh->b_dirt)
833 {
834 ll_rw_block(WRITE, 1, &bh);
835 wait_on_buffer(bh);
836 if (bh->b_req && !bh->b_uptodate)
837 {
838 printk ("IO error syncing ext2 inode [%04x:%08x]\n",
839 inode->i_dev, inode->i_ino);
840 err = -1;
841 }
842 }
843 else if (!bh)
844 err = -1;
845 brelse (bh);
846 return err;
847 }