This source file includes following definitions.
- ext2_put_inode
- ext2_put_super
- convert_pre_02b_fs
- ext2_read_super
- ext2_write_super
- ext2_statfs
- block_bmap
- ext2_bmap
- inode_getblk
- block_getblk
- ext2_getblk
- ext2_bread
- ext2_read_inode
- ext2_write_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_INO)
30 return;
31 inode->i_size = 0;
32 if (inode->i_blocks)
33 ext2_truncate (inode);
34 ext2_free_inode (inode);
35 }
36
37 void ext2_put_super (struct super_block * sb)
38 {
39 struct ext2_super_block * es;
40 int i;
41
42 lock_super (sb);
43 es = (struct ext2_super_block *) sb->u.ext2_sb.s_sbh->b_data;
44 es->s_valid = sb->u.ext2_sb.s_was_mounted_valid;
45 sb->u.ext2_sb.s_sbh->b_dirt = 1;
46 #ifndef DONT_USE_DCACHE
47 ext2_dcache_invalidate (sb->s_dev);
48 #endif
49 sb->s_dev = 0;
50 for (i = 0; i < EXT2_MAX_GROUP_DESC; i++)
51 if (sb->u.ext2_sb.s_group_desc[i])
52 brelse (sb->u.ext2_sb.s_group_desc[i]);
53 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
54 if (sb->u.ext2_sb.s_inode_bitmap[i])
55 brelse (sb->u.ext2_sb.s_inode_bitmap[i]);
56 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
57 if (sb->u.ext2_sb.s_block_bitmap[i])
58 brelse (sb->u.ext2_sb.s_block_bitmap[i]);
59 unlock_super (sb);
60 return;
61 }
62
63 static struct super_operations ext2_sops = {
64 ext2_read_inode,
65 NULL,
66 ext2_write_inode,
67 ext2_put_inode,
68 ext2_put_super,
69 ext2_write_super,
70 ext2_statfs
71 };
72
73 #ifdef EXT2FS_PRE_02B_COMPAT
74
75 static int convert_pre_02b_fs (struct super_block * sb,
76 struct buffer_head * bh)
77 {
78 struct ext2_super_block * es;
79 struct ext2_old_group_desc old_group_desc [BLOCK_SIZE / sizeof (struct ext2_old_group_desc)];
80 struct ext2_group_desc * gdp;
81 struct buffer_head * bh2;
82 int groups_count;
83 int i;
84
85 es = (struct ext2_super_block *) bh->b_data;
86 bh2 = bread (sb->s_dev, 2, BLOCK_SIZE);
87 if (!bh2) {
88 printk ("Cannot read descriptor blocks while converting !\n");
89 return 0;
90 }
91 memcpy (old_group_desc, bh2->b_data, BLOCK_SIZE);
92 groups_count = (sb->u.ext2_sb.s_blocks_count -
93 sb->u.ext2_sb.s_first_data_block +
94 (EXT2_BLOCK_SIZE(sb) * 8) - 1) /
95 (EXT2_BLOCK_SIZE(sb) * 8);
96 memset (bh2->b_data, 0, BLOCK_SIZE);
97 gdp = (struct ext2_group_desc *) bh2->b_data;
98 for (i = 0; i < groups_count; i++) {
99 gdp[i].bg_block_bitmap = old_group_desc[i].bg_block_bitmap;
100 gdp[i].bg_inode_bitmap = old_group_desc[i].bg_inode_bitmap;
101 gdp[i].bg_inode_table = old_group_desc[i].bg_inode_table;
102 gdp[i].bg_free_blocks_count = old_group_desc[i].bg_free_blocks_count;
103 gdp[i].bg_free_inodes_count = old_group_desc[i].bg_free_inodes_count;
104 }
105 bh2->b_dirt = 1;
106 brelse (bh2);
107 es->s_magic = EXT2_SUPER_MAGIC;
108 bh->b_dirt = 1;
109 sb->s_magic = EXT2_SUPER_MAGIC;
110 return 1;
111 }
112
113 #endif
114
115 struct super_block * ext2_read_super (struct super_block * s, void * data,
116 int silent)
117 {
118 struct buffer_head * bh;
119 struct ext2_super_block * es;
120 int dev = s->s_dev;
121 int bh_count;
122 int i, j;
123 #ifdef EXT2FS_PRE_02B_COMPAT
124 int fs_converted = 0;
125 #endif
126
127 lock_super (s);
128 if (!(bh = bread (dev, 1, BLOCK_SIZE))) {
129 s->s_dev = 0;
130 unlock_super (s);
131 printk ("EXT2-fs: unable to read superblock\n");
132 return NULL;
133 }
134 es = (struct ext2_super_block *) bh->b_data;
135 s->s_magic = es->s_magic;
136 s->s_blocksize = EXT2_MIN_BLOCK_SIZE << es->s_log_block_size;
137 s->u.ext2_sb.s_inodes_count = es->s_inodes_count;
138 s->u.ext2_sb.s_blocks_count = es->s_blocks_count;
139 s->u.ext2_sb.s_r_blocks_count = es->s_r_blocks_count;
140 s->u.ext2_sb.s_first_data_block = es->s_first_data_block;
141 s->u.ext2_sb.s_log_block_size = es->s_log_block_size;
142 s->u.ext2_sb.s_log_frag_size = es->s_log_frag_size;
143 s->u.ext2_sb.s_frag_size = EXT2_MIN_FRAG_SIZE <<
144 es->s_log_frag_size;
145 if (s->u.ext2_sb.s_frag_size)
146 s->u.ext2_sb.s_frags_per_block = s->s_blocksize /
147 s->u.ext2_sb.s_frag_size;
148 else
149 s->s_magic = 0;
150 s->u.ext2_sb.s_blocks_per_group = es->s_blocks_per_group;
151 s->u.ext2_sb.s_frags_per_group = es->s_frags_per_group;
152 s->u.ext2_sb.s_inodes_per_group = es->s_inodes_per_group;
153 s->u.ext2_sb.s_inodes_per_block = s->s_blocksize /
154 sizeof (struct ext2_inode);
155 s->u.ext2_sb.s_desc_per_block = s->s_blocksize /
156 sizeof (struct ext2_group_desc);
157 s->u.ext2_sb.s_sbh = bh;
158 s->u.ext2_sb.s_was_mounted_valid = es->s_valid;
159 s->u.ext2_sb.s_rename_lock = 0;
160 s->u.ext2_sb.s_rename_wait = NULL;
161 #ifdef EXT2FS_PRE_02B_COMPAT
162 if (s->s_magic == EXT2_OLD_SUPER_MAGIC) {
163 if (es->s_blocks_count > 262144) {
164
165 s->s_dev = 0;
166 unlock_super (s);
167 brelse (bh);
168 printk ("EXT2-fs: trying to mount a pre-0.2b file"
169 "system which cannot be converted\n");
170 return NULL;
171 }
172 printk ("EXT2-fs: mounting a pre 0.2b file system, "
173 "will try to convert the structure\n");
174 if (s->s_flags & MS_RDONLY == 0) {
175 s->s_dev = 0;
176 unlock_super (s);
177 brelse (bh);
178 printk ("EXT2-fs: cannot convert a read-only fs\n");
179 return NULL;
180 }
181 if (!convert_pre_02b_fs (s, bh)) {
182 s->s_dev = 0;
183 unlock_super (s);
184 brelse (bh);
185 printk ("EXT2-fs: conversion failed !!!\n");
186 return NULL;
187 }
188 printk ("EXT2-fs: conversion succeeded !!!\n");
189 fs_converted = 1;
190 }
191 #endif
192 if (s->s_magic != EXT2_SUPER_MAGIC) {
193 s->s_dev = 0;
194 unlock_super (s);
195 brelse (bh);
196 if (!silent)
197 printk("VFS: Can't find an ext2fs filesystem on dev 0x%04x.\n",
198 dev);
199 return NULL;
200 }
201 if (s->s_blocksize != s->u.ext2_sb.s_frag_size) {
202 s->s_dev = 0;
203 unlock_super (s);
204 brelse (bh);
205 printk ("EXT2-fs: fragsize != blocksize (not supported yet)\n");
206 return NULL;
207 }
208 if (!es->s_valid)
209 printk ("EXT2-fs warning: mounting unchecked file system, "
210 "running e2fsck is recommended\n");
211 s->u.ext2_sb.s_groups_count = (s->u.ext2_sb.s_blocks_count -
212 s->u.ext2_sb.s_first_data_block +
213 EXT2_BLOCKS_PER_GROUP(s) - 1) /
214 EXT2_BLOCKS_PER_GROUP(s);
215 for (i = 0; i < EXT2_MAX_GROUP_DESC; i++)
216 s->u.ext2_sb.s_group_desc[i] = NULL;
217 bh_count = (s->u.ext2_sb.s_groups_count +
218 EXT2_DESC_PER_BLOCK(s) - 1) /
219 EXT2_DESC_PER_BLOCK(s);
220 for (i = 0; i < bh_count; i++) {
221 s->u.ext2_sb.s_group_desc[i] = bread (dev, i + 2, s->s_blocksize);
222 if (!s->u.ext2_sb.s_group_desc[i]) {
223 s->s_dev = 0;
224 unlock_super (s);
225 for (j = 0; j < i; j++)
226 brelse (s->u.ext2_sb.s_group_desc[i]);
227 brelse (bh);
228 printk ("ext2_read_super: unable to read group descriptors\n");
229 return NULL;
230 }
231 }
232 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++) {
233 s->u.ext2_sb.s_inode_bitmap_number[i] = 0;
234 s->u.ext2_sb.s_inode_bitmap[i] = NULL;
235 s->u.ext2_sb.s_block_bitmap_number[i] = 0;
236 s->u.ext2_sb.s_block_bitmap[i] = NULL;
237 }
238 s->u.ext2_sb.s_loaded_inode_bitmaps = 0;
239 s->u.ext2_sb.s_loaded_block_bitmaps = 0;
240 unlock_super (s);
241
242 s->s_dev = dev;
243 s->s_op = &ext2_sops;
244 if (!(s->s_mounted = iget(s, EXT2_ROOT_INO))) {
245 s->s_dev = 0;
246 for (i = 0; i < EXT2_MAX_GROUP_DESC; i++)
247 if (s->u.ext2_sb.s_group_desc[i])
248 brelse (s->u.ext2_sb.s_group_desc[i]);
249 brelse (bh);
250 printk ("EXT2-fs: get root inode failed\n");
251 return NULL;
252 }
253 if ((s->s_flags & MS_RDONLY) == 0) {
254 es->s_valid = 0;
255 es->s_mtime = CURRENT_TIME;
256 bh->b_dirt = 1;
257 s->s_dirt = 1;
258 }
259 #ifdef EXT2FS_PRE_02B_COMPAT
260 if (fs_converted) {
261 for (i = 0; i < bh_count; i++)
262 s->u.ext2_sb.s_group_desc[i]->b_dirt = 1;
263 s->s_dirt = 1;
264 }
265 #endif
266 printk ("[EXT II FS %s, bs=%d, fs=%d, gc=%d, bpg=%d, ipg=%d]\n",
267 EXT2FS_VERSION, s->s_blocksize, s->u.ext2_sb.s_frag_size,
268 s->u.ext2_sb.s_groups_count,
269 EXT2_BLOCKS_PER_GROUP(s), EXT2_INODES_PER_GROUP(s));
270 return s;
271 }
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286 void ext2_write_super (struct super_block * sb)
287 {
288 struct ext2_super_block * es;
289 struct buffer_head * bh;
290 unsigned long block;
291 unsigned long bh_count;
292 int i, j;
293
294 if ((sb->s_flags & MS_RDONLY) == 0) {
295 es = (struct ext2_super_block *) sb->u.ext2_sb.s_sbh->b_data;
296 #ifdef EXT2FS_DEBUG
297 printk ("ext2_write_super: setting valid to 0\n");
298 #endif
299 es->s_valid = 0;
300 es->s_wtime = CURRENT_TIME;
301 sb->u.ext2_sb.s_sbh->b_dirt = 1;
302 bh_count = (sb->u.ext2_sb.s_groups_count +
303 EXT2_DESC_PER_BLOCK(sb) - 1) /
304 EXT2_DESC_PER_BLOCK(sb);
305 for (i = 0; i < sb->u.ext2_sb.s_groups_count; i++) {
306 block = sb->u.ext2_sb.s_first_data_block +
307 i * sb->u.ext2_sb.s_blocks_per_group;
308 if (!(bh = bread (sb->s_dev, block, BLOCK_SIZE)))
309 printk ("ext2_write_super: Unable to read backup super block for group %d\n", i);
310 else {
311 #ifdef EXT2FS_DEBUG
312 printk ("ext2_write_super: writing super block backup in group %d at block %d\n", i, block);
313 #endif
314 memcpy (bh->b_data, es, BLOCK_SIZE);
315 bh ->b_dirt = 1;
316 brelse (bh);
317 }
318 for (j = 0; j < bh_count; j++) {
319 block ++;
320 #ifdef EXT2FS_DEBUG
321 printk ("ext2_write_super: writing descriptors (block %d) backup in group %d at block %d\n", j, i, block);
322 #endif
323 if (!(bh = bread (sb->s_dev, block, sb->s_blocksize)))
324 printk ("ext2_write_super: Unable to read backup descriptor for group %d\n", i);
325 else {
326 memcpy (bh->b_data, sb->u.ext2_sb.s_group_desc[j]->b_data, sb->s_blocksize);
327 bh ->b_dirt = 1;
328 brelse (bh);
329 }
330 }
331 }
332 }
333 sb->s_dirt = 0;
334 }
335
336 void ext2_statfs (struct super_block * sb, struct statfs * buf)
337 {
338 long tmp;
339
340 put_fs_long (EXT2_SUPER_MAGIC, &buf->f_type);
341 put_fs_long (sb->s_blocksize, &buf->f_bsize);
342 put_fs_long (sb->u.ext2_sb.s_blocks_count << sb->u.ext2_sb.s_log_block_size,
343 &buf->f_blocks);
344 tmp = ext2_count_free_blocks (sb);
345 put_fs_long (tmp, &buf->f_bfree);
346 if (tmp >= sb->u.ext2_sb.s_r_blocks_count)
347 put_fs_long (tmp - sb->u.ext2_sb.s_r_blocks_count,
348 &buf->f_bavail);
349 else
350 put_fs_long (0, &buf->f_bavail);
351 put_fs_long (sb->u.ext2_sb.s_inodes_count, &buf->f_files);
352 put_fs_long (ext2_count_free_inodes(sb), &buf->f_ffree);
353 put_fs_long (EXT2_NAME_LEN, &buf->f_namelen);
354
355 }
356
357 #define inode_bmap(inode, nr) ((inode)->u.ext2_i.i_data[(nr)])
358
359 static int block_bmap (struct buffer_head * bh, int nr)
360 {
361 int tmp;
362
363 if (!bh)
364 return 0;
365 tmp = ((unsigned long *) bh->b_data)[nr];
366 brelse (bh);
367 return tmp;
368 }
369
370 int ext2_bmap (struct inode * inode, int block)
371 {
372 int i;
373 int addr_per_block = EXT2_ADDR_PER_BLOCK(inode->i_sb);
374
375 if (block < 0) {
376 printk("ext2_bmap: block < 0");
377 return 0;
378 }
379 if (block >= EXT2_NDIR_BLOCKS + addr_per_block +
380 addr_per_block * addr_per_block +
381 addr_per_block * addr_per_block * addr_per_block) {
382 printk ("ext2_bmap: block > big");
383 return 0;
384 }
385 if (block < EXT2_NDIR_BLOCKS)
386 return inode_bmap (inode, block);
387 block -= EXT2_NDIR_BLOCKS;
388 if (block < addr_per_block) {
389 i = inode_bmap (inode, EXT2_IND_BLOCK);
390 if (!i)
391 return 0;
392 return block_bmap (bread (inode->i_dev, i,
393 inode->i_sb->s_blocksize), block);
394 }
395 block -= addr_per_block;
396 if (block < addr_per_block * addr_per_block) {
397 i = inode_bmap (inode, EXT2_DIND_BLOCK);
398 if (!i)
399 return 0;
400 i = block_bmap (bread (inode->i_dev, i,
401 inode->i_sb->s_blocksize),
402 block / addr_per_block);
403 if (!i)
404 return 0;
405 return block_bmap (bread (inode->i_dev, i,
406 inode->i_sb->s_blocksize),
407 block & (addr_per_block - 1));
408 }
409 block -= addr_per_block * addr_per_block;
410 i = inode_bmap (inode, EXT2_TIND_BLOCK);
411 if (!i)
412 return 0;
413 i = block_bmap (bread (inode->i_dev, i, inode->i_sb->s_blocksize),
414 block / (addr_per_block * addr_per_block));
415 if (!i)
416 return 0;
417 i = block_bmap (bread (inode->i_dev, i, inode->i_sb->s_blocksize),
418 (block / addr_per_block) & (addr_per_block - 1));
419 if (!i)
420 return 0;
421 return block_bmap (bread (inode->i_dev, i, inode->i_sb->s_blocksize),
422 block & (addr_per_block - 1));
423 }
424
425 static struct buffer_head * inode_getblk (struct inode * inode, int nr,
426 int create, int new_block, int *err)
427 {
428 int tmp, goal = 0;
429 unsigned long * p;
430 struct buffer_head * result;
431 int blocks = inode->i_sb->s_blocksize / 512;
432
433 p = inode->u.ext2_i.i_data + nr;
434 repeat:
435 tmp = *p;
436 if (tmp) {
437 result = getblk (inode->i_dev, tmp, inode->i_sb->s_blocksize);
438 if (tmp == *p)
439 return result;
440 brelse (result);
441 goto repeat;
442 }
443 if (!create || new_block >=
444 (current->rlim[RLIMIT_FSIZE].rlim_cur >>
445 EXT2_BLOCK_SIZE_BITS(inode->i_sb))) {
446 *err = -EFBIG;
447 return NULL;
448 }
449 if (inode->u.ext2_i.i_next_alloc_block == new_block)
450 goal = inode->u.ext2_i.i_next_alloc_goal;
451 #ifdef EXT2FS_DEBUG
452 printk ("ext2 inode_getblk: hint = %d,", goal);
453 #endif
454 if (!goal) {
455 for (tmp = nr-1; tmp>=0; tmp--) {
456 if (inode->u.ext2_i.i_data[tmp]) {
457 goal = inode->u.ext2_i.i_data[tmp];
458 break;
459 }
460 }
461 if (!goal)
462 goal = (inode->u.ext2_i.i_block_group *
463 EXT2_BLOCKS_PER_GROUP(inode->i_sb))
464 + inode->i_sb->u.ext2_sb.s_first_data_block;
465 }
466
467 #ifdef EXT2FS_DEBUG
468 printk (" goal = %d.\n", goal);
469 #endif
470 tmp = ext2_new_block (inode->i_sb, goal);
471 if (!tmp)
472 return NULL;
473 result = getblk (inode->i_dev, tmp, inode->i_sb->s_blocksize);
474 if (*p) {
475 ext2_free_block (inode->i_sb, tmp);
476 brelse (result);
477 goto repeat;
478 }
479 *p = tmp;
480 inode->u.ext2_i.i_next_alloc_block = new_block;
481 inode->u.ext2_i.i_next_alloc_goal = tmp;
482 inode->i_ctime = CURRENT_TIME;
483 inode->i_blocks += blocks;
484 inode->i_dirt = 1;
485 return result;
486 }
487
488 static struct buffer_head * block_getblk (struct inode * inode,
489 struct buffer_head * bh, int nr,
490 int create, int blocksize,
491 int new_block, int *err)
492 {
493 int tmp, goal = 0;
494 unsigned long * p;
495 struct buffer_head * result;
496 int blocks = inode->i_sb->s_blocksize / 512;
497
498 if (!bh)
499 return NULL;
500 if (!bh->b_uptodate) {
501 ll_rw_block (READ, 1, &bh);
502 wait_on_buffer (bh);
503 if (!bh->b_uptodate) {
504 brelse (bh);
505 return NULL;
506 }
507 }
508 p = nr + (unsigned long *) bh->b_data;
509 repeat:
510 tmp = *p;
511 if (tmp) {
512 result = getblk (bh->b_dev, tmp, blocksize);
513 if (tmp == *p) {
514 brelse (bh);
515 return result;
516 }
517 brelse (result);
518 goto repeat;
519 }
520 if (!create || new_block >=
521 (current->rlim[RLIMIT_FSIZE].rlim_cur >>
522 EXT2_BLOCK_SIZE_BITS(inode->i_sb))) {
523 brelse (bh);
524 *err = -EFBIG;
525 return NULL;
526 }
527 if (inode->u.ext2_i.i_next_alloc_block == new_block)
528 goal = inode->u.ext2_i.i_next_alloc_goal;
529 if (!goal) {
530 for (tmp = nr-1; tmp>=0; tmp--) {
531 if (((unsigned long *) bh->b_data)[tmp]) {
532 goal = ((unsigned long *)bh->b_data)[tmp];
533 break;
534 }
535 }
536 if (!goal)
537 goal = bh->b_blocknr+1;
538 }
539 tmp = ext2_new_block (inode->i_sb, goal);
540 if (!tmp) {
541 #ifdef EXT2FS_DEBUG
542 printk ("inode_getblk: ext2_new_block returned 0\n");
543 #endif
544 brelse (bh);
545 return NULL;
546 }
547 result = getblk (bh->b_dev, tmp, blocksize);
548 if (*p) {
549 ext2_free_block (inode->i_sb, tmp);
550 brelse (result);
551 goto repeat;
552 }
553 *p = tmp;
554 bh->b_dirt = 1;
555 inode->i_ctime = CURRENT_TIME;
556 inode->i_blocks += blocks;
557 inode->i_dirt = 1;
558 inode->u.ext2_i.i_next_alloc_block = new_block;
559 inode->u.ext2_i.i_next_alloc_goal = tmp;
560 brelse (bh);
561 return result;
562 }
563
564 struct buffer_head * ext2_getblk (struct inode * inode, int block,
565 int create, int *err)
566 {
567 struct buffer_head * bh;
568 int b;
569 unsigned long addr_per_block = EXT2_ADDR_PER_BLOCK(inode->i_sb);
570
571 *err = -EIO;
572 if (block < 0) {
573 printk ("ext2_getblk: block < 0\n");
574 return NULL;
575 }
576 if (block > EXT2_NDIR_BLOCKS + addr_per_block +
577 addr_per_block * addr_per_block +
578 addr_per_block * addr_per_block * addr_per_block) {
579 printk ("ext2_getblk: block > big\n");
580 return NULL;
581 }
582
583
584
585 #ifdef EXT2FS_DEBUG
586 printk ("ext2_getblk: block %d, next %d, goal %d.\n", block,
587 inode->u.ext2_i.i_next_alloc_block,
588 inode->u.ext2_i.i_next_alloc_goal);
589 #endif
590 if (block == inode->u.ext2_i.i_next_alloc_block + 1) {
591 inode->u.ext2_i.i_next_alloc_block++;
592 inode->u.ext2_i.i_next_alloc_goal++;
593 }
594
595 *err = -ENOSPC;
596 b = block;
597 if (block < EXT2_NDIR_BLOCKS)
598 return inode_getblk (inode, block, create, b, err);
599 block -= EXT2_NDIR_BLOCKS;
600 if (block < addr_per_block) {
601 bh = inode_getblk (inode, EXT2_IND_BLOCK, create, b, err);
602 return block_getblk (inode, bh, block, create,
603 inode->i_sb->s_blocksize, b, err);
604 }
605 block -= addr_per_block;
606 if (block < addr_per_block * addr_per_block) {
607 bh = inode_getblk (inode, EXT2_DIND_BLOCK, create, b, err);
608 bh = block_getblk (inode, bh, block / addr_per_block, create,
609 inode->i_sb->s_blocksize, b, err);
610 return block_getblk (inode, bh, block & (addr_per_block - 1),
611 create, inode->i_sb->s_blocksize, b, err);
612 }
613 block -= addr_per_block * addr_per_block;
614 bh = inode_getblk (inode, EXT2_TIND_BLOCK, create, b, err);
615 bh = block_getblk (inode, bh, block/(addr_per_block * addr_per_block),
616 create, inode->i_sb->s_blocksize, b, err);
617 bh = block_getblk (inode, bh, (block/addr_per_block) & (addr_per_block - 1),
618 create, inode->i_sb->s_blocksize, b, err);
619 return block_getblk (inode, bh, block & (addr_per_block - 1), create,
620 inode->i_sb->s_blocksize, b, err);
621 }
622
623 struct buffer_head * ext2_bread (struct inode * inode, int block,
624 int create, int *err)
625 {
626 struct buffer_head * bh;
627
628 bh = ext2_getblk (inode, block, create, err);
629 if (!bh || bh->b_uptodate)
630 return bh;
631 ll_rw_block (READ, 1, &bh);
632 wait_on_buffer (bh);
633 if (bh->b_uptodate)
634 return bh;
635 brelse (bh);
636 *err = -EIO;
637 return NULL;
638 }
639
640 void ext2_read_inode (struct inode * inode)
641 {
642 struct buffer_head * bh;
643 struct ext2_inode * raw_inode;
644 unsigned long block_group;
645 unsigned long group_desc;
646 unsigned long desc;
647 unsigned long block;
648 struct ext2_group_desc * gdp;
649
650 if ((inode->i_ino != EXT2_ROOT_INO && inode->i_ino != EXT2_ACL_INO &&
651 inode->i_ino < EXT2_FIRST_INO) ||
652 inode->i_ino > inode->i_sb->u.ext2_sb.s_inodes_count) {
653 printk ("ext2_read_inode: bad inode number of dev %0x04: %d\n",
654 inode->i_dev, inode->i_ino);
655 return;
656 }
657 block_group = (inode->i_ino - 1) / EXT2_INODES_PER_GROUP(inode->i_sb);
658 if (block_group >= inode->i_sb->u.ext2_sb.s_groups_count)
659 panic ("ext2_read_inode: group >= groups count");
660 group_desc = block_group / EXT2_DESC_PER_BLOCK(inode->i_sb);
661 desc = block_group % EXT2_DESC_PER_BLOCK(inode->i_sb);
662 bh = inode->i_sb->u.ext2_sb.s_group_desc[group_desc];
663 if (!bh)
664 panic ("ext2_read_inode: Descriptor not loaded");
665 gdp = (struct ext2_group_desc *) bh->b_data;
666 block = gdp[desc].bg_inode_table +
667 (((inode->i_ino - 1) % EXT2_INODES_PER_GROUP(inode->i_sb))
668 / EXT2_INODES_PER_BLOCK(inode->i_sb));
669 if (!(bh = bread (inode->i_dev, block, inode->i_sb->s_blocksize)))
670 panic ("ext2_read_inode: unable to read i-node block");
671 raw_inode = ((struct ext2_inode *) bh->b_data) +
672 (inode->i_ino - 1) % EXT2_INODES_PER_BLOCK(inode->i_sb);
673 inode->i_mode = raw_inode->i_mode;
674 inode->i_uid = raw_inode->i_uid;
675 inode->i_gid = raw_inode->i_gid;
676 inode->i_nlink = raw_inode->i_links_count;
677 inode->i_size = raw_inode->i_size;
678 inode->i_atime = raw_inode->i_atime;
679 inode->i_ctime = raw_inode->i_ctime;
680 inode->i_mtime = raw_inode->i_mtime;
681 inode->u.ext2_i.i_dtime = raw_inode->i_dtime;
682 inode->i_blksize = inode->i_sb->s_blocksize;
683 inode->i_blocks = raw_inode->i_blocks;
684 inode->u.ext2_i.i_flags = raw_inode->i_flags;
685 inode->u.ext2_i.i_faddr = raw_inode->i_faddr;
686 inode->u.ext2_i.i_frag = raw_inode->i_frag;
687 inode->u.ext2_i.i_fsize = raw_inode->i_fsize;
688 inode->u.ext2_i.i_file_acl = raw_inode->i_file_acl;
689 inode->u.ext2_i.i_dir_acl = raw_inode->i_dir_acl;
690 inode->u.ext2_i.i_version = raw_inode->i_version;
691 inode->u.ext2_i.i_block_group = block_group;
692 inode->u.ext2_i.i_next_alloc_block = 0;
693 inode->u.ext2_i.i_next_alloc_goal = 0;
694 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
695 inode->i_rdev = raw_inode->i_block[0];
696 else for (block = 0; block < EXT2_N_BLOCKS; block++)
697 inode->u.ext2_i.i_data[block] = raw_inode->i_block[block];
698 brelse (bh);
699 inode->i_op = NULL;
700 if (inode->i_ino == EXT2_ACL_INO)
701 ;
702 else if (S_ISREG(inode->i_mode))
703 inode->i_op = &ext2_file_inode_operations;
704 else if (S_ISDIR(inode->i_mode))
705 inode->i_op = &ext2_dir_inode_operations;
706 else if (S_ISLNK(inode->i_mode))
707 inode->i_op = &ext2_symlink_inode_operations;
708 else if (S_ISCHR(inode->i_mode))
709 inode->i_op = &chrdev_inode_operations;
710 else if (S_ISBLK(inode->i_mode))
711 inode->i_op = &blkdev_inode_operations;
712 else if (S_ISFIFO(inode->i_mode))
713 init_fifo(inode);
714 }
715
716 void ext2_write_inode (struct inode * inode)
717 {
718 struct buffer_head * bh;
719 struct ext2_inode * raw_inode;
720 unsigned long block_group;
721 unsigned long group_desc;
722 unsigned long desc;
723 unsigned long block;
724 struct ext2_group_desc * gdp;
725
726 if ((inode->i_ino != EXT2_ROOT_INO && inode->i_ino < EXT2_FIRST_INO) ||
727 inode->i_ino > inode->i_sb->u.ext2_sb.s_inodes_count) {
728 printk ("ext2_write_inode: bad inode number of dev %0x04: %d\n",
729 inode->i_dev, inode->i_ino);
730 return;
731 }
732 block_group = (inode->i_ino - 1) / EXT2_INODES_PER_GROUP(inode->i_sb);
733 if (block_group >= inode->i_sb->u.ext2_sb.s_groups_count)
734 panic ("ext2_write_inode: group >= groups count");
735 group_desc = block_group / EXT2_DESC_PER_BLOCK(inode->i_sb);
736 desc = block_group % EXT2_DESC_PER_BLOCK(inode->i_sb);
737 bh = inode->i_sb->u.ext2_sb.s_group_desc[group_desc];
738 if (!bh)
739 panic ("ext2_write_inode: Descriptor not loaded");
740 gdp = (struct ext2_group_desc *) bh->b_data;
741 block = gdp[desc].bg_inode_table +
742 (((inode->i_ino - 1) % EXT2_INODES_PER_GROUP(inode->i_sb))
743 / EXT2_INODES_PER_BLOCK(inode->i_sb));
744 if (!(bh = bread (inode->i_dev, block, inode->i_sb->s_blocksize)))
745 panic ("ext2_write_inode: unable to read i-node block");
746 raw_inode = ((struct ext2_inode *)bh->b_data) +
747 (inode->i_ino - 1) % EXT2_INODES_PER_BLOCK(inode->i_sb);
748 raw_inode->i_mode = inode->i_mode;
749 raw_inode->i_uid = inode->i_uid;
750 raw_inode->i_gid = inode->i_gid;
751 raw_inode->i_links_count = inode->i_nlink;
752 raw_inode->i_size = inode->i_size;
753 raw_inode->i_atime = inode->i_atime;
754 raw_inode->i_ctime = inode->i_ctime;
755 raw_inode->i_mtime = inode->i_mtime;
756 raw_inode->i_blocks = inode->i_blocks;
757 raw_inode->i_dtime = inode->u.ext2_i.i_dtime;
758 raw_inode->i_flags = inode->u.ext2_i.i_flags;
759 raw_inode->i_faddr = inode->u.ext2_i.i_faddr;
760 raw_inode->i_frag = inode->u.ext2_i.i_frag;
761 raw_inode->i_fsize = inode->u.ext2_i.i_fsize;
762 raw_inode->i_file_acl = inode->u.ext2_i.i_file_acl;
763 raw_inode->i_dir_acl = inode->u.ext2_i.i_dir_acl;
764 raw_inode->i_version = inode->u.ext2_i.i_version;
765 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
766 raw_inode->i_block[0] = inode->i_rdev;
767 else for (block = 0; block < EXT2_N_BLOCKS; block++)
768 raw_inode->i_block[block] = inode->u.ext2_i.i_data[block];
769 bh->b_dirt = 1;
770 inode->i_dirt = 0;
771 brelse (bh);
772 }
![[first]](../icons/first.png){kind=icon}
![[previous]](../icons/n_left.png){kind=icon}
![[next]](../icons/n_right.png){kind=icon}
![[last]](../icons/last.png){kind=icon}
![[top]](../icons/n_top.png){kind=icon}
![[bottom]](../icons/bottom.png){kind=icon}
![[index]](../icons/index.png){kind=icon}
![[help]](../icons/help.png){kind=icon}
*/
![[next]](../icons/right.png)
![[first]](../icons/n_first.png)
![[top]](../icons/top.png)
![[previous]](../icons/left.png)
![[last]](../icons/n_last.png)
![[bottom]](../icons/n_bottom.png){kind=icon}