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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13 #include <linux/sched.h>
14 #include <linux/ext2_fs.h>
15 #include <linux/kernel.h>
16 #include <linux/mm.h>
17 #include <linux/string.h>
18 #include <linux/stat.h>
19 #include <linux/locks.h>
20
21 #include <asm/system.h>
22 #include <asm/segment.h>
23
24 void ext2_put_inode (struct inode * inode)
25 {
26 if (inode->i_nlink)
27 return;
28 inode->i_size = 0;
29 if (inode->i_blocks)
30 ext2_truncate (inode);
31 ext2_free_inode (inode);
32 }
33
34 void ext2_put_super (struct super_block * sb)
35 {
36 struct ext2_super_block * es;
37 int i;
38
39 lock_super (sb);
40 es = (struct ext2_super_block *) sb->u.ext2_sb.s_sbh->b_data;
41 es->s_valid = 1;
42 sb->u.ext2_sb.s_sbh->b_dirt = 1;
43 #ifndef DONT_USE_DCACHE
44 ext2_dcache_invalidate (sb->s_dev);
45 #endif
46 sb->s_dev = 0;
47 for (i = 0; i < EXT2_MAX_GROUP_DESC; i++)
48 if (sb->u.ext2_sb.s_group_desc[i])
49 brelse (sb->u.ext2_sb.s_group_desc[i]);
50 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
51 if (sb->u.ext2_sb.s_inode_bitmap[i])
52 brelse (sb->u.ext2_sb.s_inode_bitmap[i]);
53 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
54 if (sb->u.ext2_sb.s_block_bitmap[i])
55 brelse (sb->u.ext2_sb.s_block_bitmap[i]);
56 unlock_super (sb);
57 return;
58 }
59
60 static struct super_operations ext2_sops = {
61 ext2_read_inode,
62 NULL,
63 ext2_write_inode,
64 ext2_put_inode,
65 ext2_put_super,
66 ext2_write_super,
67 ext2_statfs
68 };
69
70 static int convert_pre_02b_fs (struct super_block * sb,
71 struct buffer_head * bh)
72 {
73 struct ext2_super_block * es;
74 struct ext2_old_group_desc old_group_desc [BLOCK_SIZE / sizeof (struct ext2_old_group_desc)];
75 struct ext2_group_desc * gdp;
76 struct buffer_head * bh2;
77 int groups_count;
78 int i;
79
80 es = (struct ext2_super_block *) bh->b_data;
81 bh2 = bread (sb->s_dev, 2, BLOCK_SIZE);
82 if (!bh2) {
83 printk ("Cannot read descriptor blocks while converting !\n");
84 return 0;
85 }
86 memcpy (old_group_desc, bh2->b_data, BLOCK_SIZE);
87 groups_count = (sb->u.ext2_sb.s_blocks_count -
88 sb->u.ext2_sb.s_first_data_block +
89 (EXT2_BLOCK_SIZE(sb) * 8) - 1) /
90 (EXT2_BLOCK_SIZE(sb) * 8);
91 memset (bh2->b_data, 0, BLOCK_SIZE);
92 gdp = (struct ext2_group_desc *) bh2->b_data;
93 for (i = 0; i < groups_count; i++) {
94 gdp[i].bg_block_bitmap = old_group_desc[i].bg_block_bitmap;
95 gdp[i].bg_inode_bitmap = old_group_desc[i].bg_inode_bitmap;
96 gdp[i].bg_inode_table = old_group_desc[i].bg_inode_table;
97 gdp[i].bg_free_blocks_count = old_group_desc[i].bg_free_blocks_count;
98 gdp[i].bg_free_inodes_count = old_group_desc[i].bg_free_inodes_count;
99 }
100 bh2->b_dirt = 1;
101 brelse (bh2);
102 es->s_magic = EXT2_SUPER_MAGIC;
103 bh->b_dirt = 1;
104 sb->s_magic = EXT2_SUPER_MAGIC;
105 return 1;
106 }
107
108 struct super_block * ext2_read_super (struct super_block * s, void * data)
109 {
110 struct buffer_head * bh;
111 struct ext2_super_block * es;
112 int dev = s->s_dev;
113 int bh_count;
114 int i, j;
115 int fs_converted = 0;
116
117 lock_super (s);
118 if (!(bh = bread (dev, 1, BLOCK_SIZE))) {
119 s->s_dev = 0;
120 unlock_super (s);
121 printk ("EXT2-fs: unable to read superblock\n");
122 return NULL;
123 }
124 es = (struct ext2_super_block *) bh->b_data;
125 s->s_blocksize = EXT2_MIN_BLOCK_SIZE << es->s_log_block_size;
126 s->u.ext2_sb.s_inodes_count = es->s_inodes_count;
127 s->u.ext2_sb.s_blocks_count = es->s_blocks_count;
128 s->u.ext2_sb.s_r_blocks_count = es->s_r_blocks_count;
129 s->u.ext2_sb.s_first_data_block = es->s_first_data_block;
130 s->u.ext2_sb.s_log_block_size = es->s_log_block_size;
131 s->u.ext2_sb.s_log_frag_size = es->s_log_frag_size;
132 s->u.ext2_sb.s_frag_size = EXT2_MIN_FRAG_SIZE <<
133 es->s_log_frag_size;
134 s->u.ext2_sb.s_frags_per_block = s->s_blocksize /
135 s->u.ext2_sb.s_frag_size;
136 s->u.ext2_sb.s_blocks_per_group = es->s_blocks_per_group;
137 s->u.ext2_sb.s_frags_per_group = es->s_frags_per_group;
138 s->u.ext2_sb.s_inodes_per_group = es->s_inodes_per_group;
139 s->u.ext2_sb.s_inodes_per_block = s->s_blocksize /
140 sizeof (struct ext2_inode);
141 s->u.ext2_sb.s_desc_per_block = s->s_blocksize /
142 sizeof (struct ext2_group_desc);
143 s->s_magic = es->s_magic;
144 s->u.ext2_sb.s_sbh = bh;
145 s->u.ext2_sb.s_rename_lock = 0;
146 s->u.ext2_sb.s_rename_wait = NULL;
147 if (s->s_magic == EXT2_OLD_SUPER_MAGIC) {
148 if (es->s_blocks_count > 262144) {
149
150 s->s_dev = 0;
151 unlock_super (s);
152 brelse (bh);
153 printk ("EXT2-fs: trying to mount a pre-0.2b file"
154 "system which cannot be converted\n");
155 return NULL;
156 }
157 printk ("EXT2-fs: mounting a pre 0.2b file system, "
158 "will try to convert the structure\n");
159 if (s->s_flags & MS_RDONLY == 0) {
160 s->s_dev = 0;
161 unlock_super (s);
162 brelse (bh);
163 printk ("EXT2-fs: cannot convert a read-only fs\n");
164 return NULL;
165 }
166 if (!convert_pre_02b_fs (s, bh)) {
167 s->s_dev = 0;
168 unlock_super (s);
169 brelse (bh);
170 printk ("EXT2-fs: conversion failed !!!\n");
171 return NULL;
172 }
173 printk ("EXT2-fs: conversion succeeded !!!\n");
174 fs_converted = 1;
175 }
176 if (s->s_magic != EXT2_SUPER_MAGIC) {
177 s->s_dev = 0;
178 unlock_super (s);
179 brelse (bh);
180 printk ("EXT2-fs: magic match failed\n");
181 return NULL;
182 }
183 if (s->s_blocksize != s->u.ext2_sb.s_frag_size) {
184 s->s_dev = 0;
185 unlock_super (s);
186 brelse (bh);
187 printk ("EXT2-fs: fragsize != blocksize (not supported yet)\n");
188 return NULL;
189 }
190 if (!es->s_valid)
191 printk ("EXT2-fs warning: mounting non valid file system\n");
192 s->u.ext2_sb.s_groups_count = (s->u.ext2_sb.s_blocks_count -
193 s->u.ext2_sb.s_first_data_block +
194 (EXT2_BLOCK_SIZE(s) * 8) - 1) /
195 (EXT2_BLOCK_SIZE(s) * 8);
196 for (i = 0; i < EXT2_MAX_GROUP_DESC; i++)
197 s->u.ext2_sb.s_group_desc[i] = NULL;
198 bh_count = (s->u.ext2_sb.s_groups_count +
199 EXT2_DESC_PER_BLOCK(s) - 1) /
200 EXT2_DESC_PER_BLOCK(s);
201 for (i = 0; i < bh_count; i++) {
202 s->u.ext2_sb.s_group_desc[i] = bread (dev, i + 2, s->s_blocksize);
203 if (!s->u.ext2_sb.s_group_desc[i]) {
204 s->s_dev = 0;
205 unlock_super (s);
206 for (j = 0; j < i; j++)
207 brelse (s->u.ext2_sb.s_group_desc[i]);
208 brelse (bh);
209 printk ("ext2_read_super: unable to read group descriptors\n");
210 return NULL;
211 }
212 }
213 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++) {
214 s->u.ext2_sb.s_inode_bitmap_number[i] = 0;
215 s->u.ext2_sb.s_inode_bitmap[i] = NULL;
216 s->u.ext2_sb.s_block_bitmap_number[i] = 0;
217 s->u.ext2_sb.s_block_bitmap[i] = NULL;
218 }
219 s->u.ext2_sb.s_loaded_inode_bitmaps = 0;
220 s->u.ext2_sb.s_loaded_block_bitmaps = 0;
221 unlock_super (s);
222
223 s->s_dev = dev;
224 s->s_op = &ext2_sops;
225 if (!(s->s_mounted = iget(s, EXT2_ROOT_INO))) {
226 s->s_dev = 0;
227 for (i = 0; i < EXT2_MAX_GROUP_DESC; i++)
228 if (s->u.ext2_sb.s_group_desc[i])
229 brelse (s->u.ext2_sb.s_group_desc[i]);
230 brelse (bh);
231 printk ("EXT2-fs: get root inode failed\n");
232 return NULL;
233 }
234 if ((s->s_flags & MS_RDONLY) == 0) {
235 es->s_valid = 0;
236 es->s_mtime = CURRENT_TIME;
237 bh->b_dirt = 1;
238 s->s_dirt = 1;
239 }
240 if (fs_converted) {
241 for (i = 0; i < bh_count; i++)
242 s->u.ext2_sb.s_group_desc[i]->b_dirt = 1;
243 s->s_dirt = 1;
244 }
245 printk ("[EXT II FS %s, bs=%d, fs=%d, gc=%d, bpg=%d, ipg=%d]\n",
246 EXT2FS_VERSION, s->s_blocksize, s->u.ext2_sb.s_frag_size,
247 s->u.ext2_sb.s_groups_count,
248 EXT2_BLOCKS_PER_GROUP(s), EXT2_INODES_PER_GROUP(s));
249 return s;
250 }
251
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264
265 void ext2_write_super (struct super_block * sb)
266 {
267 struct ext2_super_block * es;
268 struct buffer_head * bh;
269 unsigned long block;
270 unsigned long bh_count;
271 int i, j;
272
273 if ((sb->s_flags & MS_RDONLY) == 0) {
274 es = (struct ext2_super_block *) sb->u.ext2_sb.s_sbh->b_data;
275 #ifdef EXT2FS_DEBUG
276 printk ("ext2_write_super: setting valid to 0\n");
277 #endif
278 es->s_valid = 0;
279 es->s_wtime = CURRENT_TIME;
280 sb->u.ext2_sb.s_sbh->b_dirt = 1;
281 bh_count = (sb->u.ext2_sb.s_groups_count +
282 EXT2_DESC_PER_BLOCK(sb) - 1) /
283 EXT2_DESC_PER_BLOCK(sb);
284 for (i = 0; i < sb->u.ext2_sb.s_groups_count; i++) {
285 block = sb->u.ext2_sb.s_first_data_block +
286 i * sb->u.ext2_sb.s_blocks_per_group;
287 if (!(bh = bread (sb->s_dev, block, BLOCK_SIZE)))
288 printk ("ext2_write_super: Unable to read backup super block for group %d\n", i);
289 else {
290 #ifdef EXT2FS_DEBUG
291 printk ("ext2_write_super: writing super block backup in group %d at block %d\n", i, block);
292 #endif
293 memcpy (bh->b_data, es, BLOCK_SIZE);
294 bh ->b_dirt = 1;
295 brelse (bh);
296 }
297 for (j = 0; j < bh_count; j++) {
298 block ++;
299 #ifdef EXT2FS_DEBUG
300 printk ("ext2_write_super: writing descriptors (block %d) backup in group %d at block %d\n", j, i, block);
301 #endif
302 if (!(bh = bread (sb->s_dev, block, sb->s_blocksize)))
303 printk ("ext2_write_super: Unable to read backup descriptor for group %d\n", i);
304 else {
305 memcpy (bh->b_data, sb->u.ext2_sb.s_group_desc[j]->b_data, sb->s_blocksize);
306 bh ->b_dirt = 1;
307 brelse (bh);
308 }
309 }
310 }
311 }
312 sb->s_dirt = 0;
313 }
314
315 void ext2_statfs (struct super_block * sb, struct statfs * buf)
316 {
317 long tmp;
318
319 put_fs_long (EXT2_SUPER_MAGIC, &buf->f_type);
320 put_fs_long (sb->s_blocksize, &buf->f_bsize);
321 put_fs_long (sb->u.ext2_sb.s_blocks_count << sb->u.ext2_sb.s_log_block_size,
322 &buf->f_blocks);
323 tmp = ext2_count_free_blocks (sb);
324 put_fs_long (tmp, &buf->f_bfree);
325 put_fs_long (tmp - sb->u.ext2_sb.s_r_blocks_count, &buf->f_bavail);
326 put_fs_long (sb->u.ext2_sb.s_inodes_count, &buf->f_files);
327 put_fs_long (ext2_count_free_inodes(sb), &buf->f_ffree);
328 put_fs_long (EXT2_NAME_LEN, &buf->f_namelen);
329
330 }
331
332 #define inode_bmap(inode, nr) ((inode)->u.ext2_i.i_data[(nr)])
333
334 static int block_bmap (struct buffer_head * bh, int nr)
335 {
336 int tmp;
337
338 if (!bh)
339 return 0;
340 tmp = ((unsigned long *) bh->b_data)[nr];
341 brelse (bh);
342 return tmp;
343 }
344
345 int ext2_bmap (struct inode * inode, int block)
346 {
347 int i;
348 int addr_per_block = EXT2_ADDR_PER_BLOCK(inode->i_sb);
349
350 if (block < 0) {
351 printk("ext2_bmap: block < 0");
352 return 0;
353 }
354 if (block >= EXT2_NDIR_BLOCKS + addr_per_block +
355 addr_per_block * addr_per_block +
356 addr_per_block * addr_per_block * addr_per_block) {
357 printk ("ext2_bmap: block > big");
358 return 0;
359 }
360 if (block < EXT2_NDIR_BLOCKS)
361 return inode_bmap (inode, block);
362 block -= EXT2_NDIR_BLOCKS;
363 if (block < addr_per_block) {
364 i = inode_bmap (inode, EXT2_IND_BLOCK);
365 if (!i)
366 return 0;
367 return block_bmap (bread (inode->i_dev, i,
368 inode->i_sb->s_blocksize), block);
369 }
370 block -= addr_per_block;
371 if (block < addr_per_block * addr_per_block) {
372 i = inode_bmap (inode, EXT2_DIND_BLOCK);
373 if (!i)
374 return 0;
375 i = block_bmap (bread (inode->i_dev, i,
376 inode->i_sb->s_blocksize),
377 block / addr_per_block);
378 if (!i)
379 return 0;
380 return block_bmap (bread (inode->i_dev, i,
381 inode->i_sb->s_blocksize),
382 block & (addr_per_block - 1));
383 }
384 block -= addr_per_block * addr_per_block;
385 i = inode_bmap (inode, EXT2_TIND_BLOCK);
386 if (!i)
387 return 0;
388 i = block_bmap (bread (inode->i_dev, i, inode->i_sb->s_blocksize),
389 block / (addr_per_block * addr_per_block));
390 if (!i)
391 return 0;
392 i = block_bmap (bread (inode->i_dev, i, inode->i_sb->s_blocksize),
393 (block / addr_per_block) & (addr_per_block - 1));
394 if (!i)
395 return 0;
396 return block_bmap (bread (inode->i_dev, i, inode->i_sb->s_blocksize),
397 block & (addr_per_block - 1));
398 }
399
400 static struct buffer_head * inode_getblk (struct inode * inode, int nr,
401 int create)
402 {
403 int tmp;
404 unsigned long * p;
405 struct buffer_head * result;
406 int blocks = inode->i_sb->s_blocksize / 512;
407
408 p = inode->u.ext2_i.i_data + nr;
409 repeat:
410 tmp = *p;
411 if (tmp) {
412 result = getblk (inode->i_dev, tmp, inode->i_sb->s_blocksize);
413 if (tmp == *p)
414 return result;
415 brelse (result);
416 goto repeat;
417 }
418 if (!create)
419 return NULL;
420 tmp = ext2_new_block (inode->i_sb, inode->u.ext2_i.i_block_group);
421 if (!tmp)
422 return NULL;
423 result = getblk (inode->i_dev, tmp, inode->i_sb->s_blocksize);
424 if (*p) {
425 ext2_free_block (inode->i_sb, tmp);
426 brelse (result);
427 goto repeat;
428 }
429 *p = tmp;
430 inode->i_ctime = CURRENT_TIME;
431 inode->i_blocks += blocks;
432 inode->i_dirt = 1;
433 return result;
434 }
435
436 static struct buffer_head * block_getblk (struct inode * inode,
437 struct buffer_head * bh, int nr,
438 int create, int blocksize)
439 {
440 int tmp;
441 unsigned long * p;
442 struct buffer_head * result;
443 int blocks = inode->i_sb->s_blocksize / 512;
444
445 if (!bh)
446 return NULL;
447 if (!bh->b_uptodate) {
448 ll_rw_block (READ, 1, &bh);
449 wait_on_buffer (bh);
450 if (!bh->b_uptodate) {
451 brelse (bh);
452 return NULL;
453 }
454 }
455 p = nr + (unsigned long *) bh->b_data;
456 repeat:
457 tmp = *p;
458 if (tmp) {
459 result = getblk (bh->b_dev, tmp, blocksize);
460 if (tmp == *p) {
461 brelse (bh);
462 return result;
463 }
464 brelse (result);
465 goto repeat;
466 }
467 if (!create) {
468 brelse (bh);
469 return NULL;
470 }
471 tmp = ext2_new_block (inode->i_sb, inode->u.ext2_i.i_block_group);
472 if (!tmp) {
473 #ifdef EXT2FS_DEBUG
474 printk ("inode_getblk: ext2_new_block returned 0\n");
475 #endif
476 brelse (bh);
477 return NULL;
478 }
479 result = getblk (bh->b_dev, tmp, blocksize);
480 if (*p) {
481 ext2_free_block (inode->i_sb, tmp);
482 brelse (result);
483 goto repeat;
484 }
485 *p = tmp;
486 bh->b_dirt = 1;
487 inode->i_blocks += blocks;
488 inode->i_dirt = 1;
489 brelse (bh);
490 return result;
491 }
492
493 struct buffer_head * ext2_getblk (struct inode * inode, int block,
494 int create)
495 {
496 struct buffer_head * bh;
497 unsigned long addr_per_block = EXT2_ADDR_PER_BLOCK(inode->i_sb);
498
499 if (block < 0) {
500 printk ("ext2_getblk: block < 0\n");
501 return NULL;
502 }
503 if (block > EXT2_NDIR_BLOCKS + addr_per_block +
504 addr_per_block * addr_per_block +
505 addr_per_block * addr_per_block * addr_per_block) {
506 printk ("ext2_getblk: block > big\n");
507 return NULL;
508 }
509 if (block < EXT2_NDIR_BLOCKS)
510 return inode_getblk (inode, block, create);
511 block -= EXT2_NDIR_BLOCKS;
512 if (block < addr_per_block) {
513 bh = inode_getblk (inode, EXT2_IND_BLOCK, create);
514 return block_getblk (inode, bh, block, create,
515 inode->i_sb->s_blocksize);
516 }
517 block -= addr_per_block;
518 if (block < addr_per_block * addr_per_block) {
519 bh = inode_getblk (inode, EXT2_DIND_BLOCK, create);
520 bh = block_getblk (inode, bh, block / addr_per_block, create,
521 inode->i_sb->s_blocksize);
522 return block_getblk (inode, bh, block & (addr_per_block - 1),
523 create, inode->i_sb->s_blocksize);
524 }
525 block -= addr_per_block * addr_per_block;
526 bh = inode_getblk (inode, EXT2_IND_BLOCK, create);
527 bh = block_getblk (inode, bh, block / (addr_per_block * addr_per_block),
528 create, inode->i_sb->s_blocksize);
529 bh = block_getblk (inode, bh, (block / addr_per_block) & (addr_per_block - 1),
530 create, inode->i_sb->s_blocksize);
531 return block_getblk (inode, bh, block & (addr_per_block - 1), create,
532 inode->i_sb->s_blocksize);
533 }
534
535 struct buffer_head * ext2_bread (struct inode * inode, int block, int create)
536 {
537 struct buffer_head * bh;
538
539 bh = ext2_getblk (inode, block, create);
540 if (!bh || bh->b_uptodate)
541 return bh;
542 ll_rw_block (READ, 1, &bh);
543 wait_on_buffer (bh);
544 if (bh->b_uptodate)
545 return bh;
546 brelse (bh);
547 return NULL;
548 }
549
550 void ext2_read_inode (struct inode * inode)
551 {
552 struct buffer_head * bh;
553 struct ext2_inode * raw_inode;
554 unsigned long block_group;
555 unsigned long group_desc;
556 unsigned long desc;
557 unsigned long block;
558 struct ext2_group_desc * gdp;
559
560 if ((inode->i_ino != EXT2_ROOT_INO && inode->i_ino < EXT2_FIRST_INO) ||
561 inode->i_ino > inode->i_sb->u.ext2_sb.s_inodes_count) {
562 printk ("ext2_read_inode: bad inode number of dev %0x04: %d\n",
563 inode->i_dev, inode->i_ino);
564 return;
565 }
566 block_group = (inode->i_ino - 1) / EXT2_INODES_PER_GROUP(inode->i_sb);
567 if (block_group >= inode->i_sb->u.ext2_sb.s_groups_count)
568 panic ("ext2_read_inode: group >= groups count");
569 group_desc = block_group / EXT2_DESC_PER_BLOCK(inode->i_sb);
570 desc = block_group % EXT2_DESC_PER_BLOCK(inode->i_sb);
571 bh = inode->i_sb->u.ext2_sb.s_group_desc[group_desc];
572 if (!bh)
573 panic ("ext2_read_inode: Descriptor not loaded");
574 gdp = (struct ext2_group_desc *) bh->b_data;
575 block = gdp[desc].bg_inode_table +
576 (((inode->i_ino - 1) % EXT2_INODES_PER_GROUP(inode->i_sb))
577 / EXT2_INODES_PER_BLOCK(inode->i_sb));
578 if (!(bh = bread (inode->i_dev, block, inode->i_sb->s_blocksize)))
579 panic ("ext2_read_inode: unable to read i-node block");
580 raw_inode = ((struct ext2_inode *) bh->b_data) +
581 (inode->i_ino - 1) % EXT2_INODES_PER_BLOCK(inode->i_sb);
582 inode->i_mode = raw_inode->i_mode;
583 inode->i_uid = raw_inode->i_uid;
584 inode->i_gid = raw_inode->i_gid;
585 inode->i_nlink = raw_inode->i_links_count;
586 inode->i_size = raw_inode->i_size;
587 inode->i_atime = raw_inode->i_atime;
588 inode->i_ctime = raw_inode->i_ctime;
589 inode->i_mtime = raw_inode->i_mtime;
590 inode->u.ext2_i.i_dtime = raw_inode->i_dtime;
591 inode->i_blksize = inode->i_sb->s_blocksize;
592 inode->i_blocks = raw_inode->i_blocks;
593 inode->u.ext2_i.i_flags = raw_inode->i_flags;
594 inode->u.ext2_i.i_faddr = raw_inode->i_faddr;
595 inode->u.ext2_i.i_frag = raw_inode->i_frag;
596 inode->u.ext2_i.i_fsize = raw_inode->i_fsize;
597 inode->u.ext2_i.i_file_acl = raw_inode->i_file_acl;
598 inode->u.ext2_i.i_dir_acl = raw_inode->i_dir_acl;
599 inode->u.ext2_i.i_version = raw_inode->i_version;
600 inode->u.ext2_i.i_block_group = block_group;
601 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
602 inode->i_rdev = raw_inode->i_block[0];
603 else for (block = 0; block < EXT2_N_BLOCKS; block++)
604 inode->u.ext2_i.i_data[block] = raw_inode->i_block[block];
605 brelse (bh);
606 inode->i_op = NULL;
607 if (S_ISREG(inode->i_mode))
608 inode->i_op = &ext2_file_inode_operations;
609 else if (S_ISDIR(inode->i_mode))
610 inode->i_op = &ext2_dir_inode_operations;
611 else if (S_ISLNK(inode->i_mode))
612 inode->i_op = &ext2_symlink_inode_operations;
613 else if (S_ISCHR(inode->i_mode))
614 inode->i_op = &chrdev_inode_operations;
615 else if (S_ISBLK(inode->i_mode))
616 inode->i_op = &blkdev_inode_operations;
617 else if (S_ISFIFO(inode->i_mode)) {
618 inode->i_op = &fifo_inode_operations;
619 inode->i_pipe = 1;
620 PIPE_BASE(*inode) = NULL;
621 PIPE_HEAD(*inode) = PIPE_TAIL(*inode) = 0;
622 PIPE_READ_WAIT(*inode) = PIPE_WRITE_WAIT(*inode) = NULL;
623 PIPE_READERS(*inode) = PIPE_WRITERS(*inode) = 0;
624 }
625 }
626
627 void ext2_write_inode (struct inode * inode)
628 {
629 struct buffer_head * bh;
630 struct ext2_inode * raw_inode;
631 unsigned long block_group;
632 unsigned long group_desc;
633 unsigned long desc;
634 unsigned long block;
635 struct ext2_group_desc * gdp;
636
637 if ((inode->i_ino != EXT2_ROOT_INO && inode->i_ino < EXT2_FIRST_INO) ||
638 inode->i_ino > inode->i_sb->u.ext2_sb.s_inodes_count) {
639 printk ("ext2_write_inode: bad inode number of dev %0x04: %d\n",
640 inode->i_dev, inode->i_ino);
641 return;
642 }
643 block_group = (inode->i_ino - 1) / EXT2_INODES_PER_GROUP(inode->i_sb);
644 if (block_group >= inode->i_sb->u.ext2_sb.s_groups_count)
645 panic ("ext2_write_inode: group >= groups count");
646 group_desc = block_group / EXT2_DESC_PER_BLOCK(inode->i_sb);
647 desc = block_group % EXT2_DESC_PER_BLOCK(inode->i_sb);
648 bh = inode->i_sb->u.ext2_sb.s_group_desc[group_desc];
649 if (!bh)
650 panic ("ext2_write_inode: Descriptor not loaded");
651 gdp = (struct ext2_group_desc *) bh->b_data;
652 block = gdp[desc].bg_inode_table +
653 (((inode->i_ino - 1) % EXT2_INODES_PER_GROUP(inode->i_sb))
654 / EXT2_INODES_PER_BLOCK(inode->i_sb));
655 if (!(bh = bread (inode->i_dev, block, inode->i_sb->s_blocksize)))
656 panic ("ext2_write_inode: unable to read i-node block");
657 raw_inode = ((struct ext2_inode *)bh->b_data) +
658 (inode->i_ino - 1) % EXT2_INODES_PER_BLOCK(inode->i_sb);
659 raw_inode->i_mode = inode->i_mode;
660 raw_inode->i_uid = inode->i_uid;
661 raw_inode->i_gid = inode->i_gid;
662 raw_inode->i_links_count = inode->i_nlink;
663 raw_inode->i_size = inode->i_size;
664 raw_inode->i_atime = inode->i_atime;
665 raw_inode->i_ctime = inode->i_ctime;
666 raw_inode->i_mtime = inode->i_mtime;
667 raw_inode->i_dtime = inode->u.ext2_i.i_dtime;
668 raw_inode->i_blocks = inode->i_blocks;
669 raw_inode->i_flags = inode->u.ext2_i.i_flags;
670 raw_inode->i_faddr = inode->u.ext2_i.i_faddr;
671 raw_inode->i_frag = inode->u.ext2_i.i_frag;
672 raw_inode->i_fsize = inode->u.ext2_i.i_fsize;
673 raw_inode->i_file_acl = inode->u.ext2_i.i_file_acl;
674 raw_inode->i_dir_acl = inode->u.ext2_i.i_dir_acl;
675 raw_inode->i_version = inode->u.ext2_i.i_version;
676 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
677 raw_inode->i_block[0] = inode->i_rdev;
678 else for (block = 0; block < EXT2_N_BLOCKS; block++)
679 raw_inode->i_block[block] = inode->u.ext2_i.i_data[block];
680 bh->b_dirt = 1;
681 inode->i_dirt = 0;
682 brelse (bh);
683 }