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