This source file includes following definitions.
- ext2_error
- ext2_panic
- ext2_warning
- ext2_put_super
- convert_pre_02b_fs
- parse_options
- ext2_setup_super
- ext2_check_descriptors
- ext2_read_super
- ext2_commit_super
- ext2_write_super
- ext2_remount
- ext2_statfs
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16 #include <stdarg.h>
17
18 #include <asm/bitops.h>
19 #include <asm/segment.h>
20 #include <asm/system.h>
21
22 #include <linux/errno.h>
23 #include <linux/fs.h>
24 #include <linux/ext2_fs.h>
25 #include <linux/malloc.h>
26 #include <linux/sched.h>
27 #include <linux/stat.h>
28 #include <linux/string.h>
29 #include <linux/locks.h>
30
31 static char error_buf[1024];
32
33 void ext2_error (struct super_block * sb, const char * function,
34 const char * fmt, ...)
35 {
36 va_list args;
37
38 if (!(sb->s_flags & MS_RDONLY)) {
39 sb->u.ext2_sb.s_mount_state |= EXT2_ERROR_FS;
40 sb->u.ext2_sb.s_es->s_state |= EXT2_ERROR_FS;
41 mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
42 sb->s_dirt = 1;
43 }
44 va_start (args, fmt);
45 vsprintf (error_buf, fmt, args);
46 va_end (args);
47 if (test_opt (sb, ERRORS_PANIC) ||
48 (sb->u.ext2_sb.s_es->s_errors == EXT2_ERRORS_PANIC &&
49 !test_opt (sb, ERRORS_CONT) && !test_opt (sb, ERRORS_RO)))
50 panic ("EXT2-fs panic (device %d/%d): %s: %s\n",
51 MAJOR(sb->s_dev), MINOR(sb->s_dev), function, error_buf);
52 printk (KERN_CRIT "EXT2-fs error (device %d/%d): %s: %s\n",
53 MAJOR(sb->s_dev), MINOR(sb->s_dev), function, error_buf);
54 if (test_opt (sb, ERRORS_RO) ||
55 (sb->u.ext2_sb.s_es->s_errors == EXT2_ERRORS_RO &&
56 !test_opt (sb, ERRORS_CONT) && !test_opt (sb, ERRORS_PANIC))) {
57 printk ("Remounting filesystem read-only\n");
58 sb->s_flags |= MS_RDONLY;
59 }
60 }
61
62 NORET_TYPE void ext2_panic (struct super_block * sb, const char * function,
63 const char * fmt, ...)
64 {
65 va_list args;
66
67 if (!(sb->s_flags & MS_RDONLY)) {
68 sb->u.ext2_sb.s_mount_state |= EXT2_ERROR_FS;
69 sb->u.ext2_sb.s_es->s_state |= EXT2_ERROR_FS;
70 mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
71 sb->s_dirt = 1;
72 }
73 va_start (args, fmt);
74 vsprintf (error_buf, fmt, args);
75 va_end (args);
76 panic ("EXT2-fs panic (device %d/%d): %s: %s\n",
77 MAJOR(sb->s_dev), MINOR(sb->s_dev), function, error_buf);
78 }
79
80 void ext2_warning (struct super_block * sb, const char * function,
81 const char * fmt, ...)
82 {
83 va_list args;
84
85 va_start (args, fmt);
86 vsprintf (error_buf, fmt, args);
87 va_end (args);
88 printk (KERN_WARNING "EXT2-fs warning (device %d/%d): %s: %s\n",
89 MAJOR(sb->s_dev), MINOR(sb->s_dev), function, error_buf);
90 }
91
92 void ext2_put_super (struct super_block * sb)
93 {
94 int db_count;
95 int i;
96
97 lock_super (sb);
98 if (!(sb->s_flags & MS_RDONLY)) {
99 sb->u.ext2_sb.s_es->s_state = sb->u.ext2_sb.s_mount_state;
100 mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
101 }
102 sb->s_dev = 0;
103 db_count = sb->u.ext2_sb.s_db_per_group;
104 for (i = 0; i < db_count; i++)
105 if (sb->u.ext2_sb.s_group_desc[i])
106 brelse (sb->u.ext2_sb.s_group_desc[i]);
107 kfree_s (sb->u.ext2_sb.s_group_desc,
108 db_count * sizeof (struct buffer_head *));
109 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
110 if (sb->u.ext2_sb.s_inode_bitmap[i])
111 brelse (sb->u.ext2_sb.s_inode_bitmap[i]);
112 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
113 if (sb->u.ext2_sb.s_block_bitmap[i])
114 brelse (sb->u.ext2_sb.s_block_bitmap[i]);
115 brelse (sb->u.ext2_sb.s_sbh);
116 unlock_super (sb);
117 return;
118 }
119
120 static struct super_operations ext2_sops = {
121 ext2_read_inode,
122 NULL,
123 ext2_write_inode,
124 ext2_put_inode,
125 ext2_put_super,
126 ext2_write_super,
127 ext2_statfs,
128 ext2_remount
129 };
130
131 #ifdef EXT2FS_PRE_02B_COMPAT
132
133 static int convert_pre_02b_fs (struct super_block * sb,
134 struct buffer_head * bh)
135 {
136 struct ext2_super_block * es;
137 struct ext2_old_group_desc old_group_desc [BLOCK_SIZE / sizeof (struct ext2_old_group_desc)];
138 struct ext2_group_desc * gdp;
139 struct buffer_head * bh2;
140 int groups_count;
141 int i;
142
143 es = (struct ext2_super_block *) bh->b_data;
144 bh2 = bread (sb->s_dev, 2, BLOCK_SIZE);
145 if (!bh2) {
146 printk ("Cannot read descriptor blocks while converting !\n");
147 return 0;
148 }
149 memcpy (old_group_desc, bh2->b_data, BLOCK_SIZE);
150 groups_count = (sb->u.ext2_sb.s_blocks_count -
151 sb->u.ext2_sb.s_first_data_block +
152 (EXT2_BLOCK_SIZE(sb) * 8) - 1) /
153 (EXT2_BLOCK_SIZE(sb) * 8);
154 memset (bh2->b_data, 0, BLOCK_SIZE);
155 gdp = (struct ext2_group_desc *) bh2->b_data;
156 for (i = 0; i < groups_count; i++) {
157 gdp[i].bg_block_bitmap = old_group_desc[i].bg_block_bitmap;
158 gdp[i].bg_inode_bitmap = old_group_desc[i].bg_inode_bitmap;
159 gdp[i].bg_inode_table = old_group_desc[i].bg_inode_table;
160 gdp[i].bg_free_blocks_count = old_group_desc[i].bg_free_blocks_count;
161 gdp[i].bg_free_inodes_count = old_group_desc[i].bg_free_inodes_count;
162 }
163 mark_buffer_dirty(bh2, 1);
164 brelse (bh2);
165 es->s_magic = EXT2_SUPER_MAGIC;
166 mark_buffer_dirty(bh, 1);
167 sb->s_magic = EXT2_SUPER_MAGIC;
168 return 1;
169 }
170
171 #endif
172
173
174
175
176 static int parse_options (char * options, unsigned long * sb_block,
177 unsigned short *resuid, unsigned short * resgid,
178 unsigned long * mount_options)
179 {
180 char * this_char;
181 char * value;
182
183 if (!options)
184 return 1;
185 for (this_char = strtok (options, ",");
186 this_char != NULL;
187 this_char = strtok (NULL, ",")) {
188 if ((value = strchr (this_char, '=')) != NULL)
189 *value++ = 0;
190 if (!strcmp (this_char, "bsddf"))
191 clear_opt (*mount_options, MINIX_DF);
192 else if (!strcmp (this_char, "check")) {
193 if (!value || !*value)
194 set_opt (*mount_options, CHECK_NORMAL);
195 else if (!strcmp (value, "none")) {
196 clear_opt (*mount_options, CHECK_NORMAL);
197 clear_opt (*mount_options, CHECK_STRICT);
198 }
199 else if (strcmp (value, "normal"))
200 set_opt (*mount_options, CHECK_NORMAL);
201 else if (strcmp (value, "strict")) {
202 set_opt (*mount_options, CHECK_NORMAL);
203 set_opt (*mount_options, CHECK_STRICT);
204 }
205 else {
206 printk ("EXT2-fs: Invalid check option: %s\n",
207 value);
208 return 0;
209 }
210 }
211 else if (!strcmp (this_char, "debug"))
212 set_opt (*mount_options, DEBUG);
213 else if (!strcmp (this_char, "errors")) {
214 if (!value || !*value) {
215 printk ("EXT2-fs: the errors option requires "
216 "an argument");
217 return 0;
218 }
219 if (!strcmp (value, "continue")) {
220 clear_opt (*mount_options, ERRORS_RO);
221 clear_opt (*mount_options, ERRORS_PANIC);
222 set_opt (*mount_options, ERRORS_CONT);
223 }
224 else if (!strcmp (value, "remount-ro")) {
225 clear_opt (*mount_options, ERRORS_CONT);
226 clear_opt (*mount_options, ERRORS_PANIC);
227 set_opt (*mount_options, ERRORS_RO);
228 }
229 else if (!strcmp (value, "panic")) {
230 clear_opt (*mount_options, ERRORS_CONT);
231 clear_opt (*mount_options, ERRORS_RO);
232 set_opt (*mount_options, ERRORS_PANIC);
233 }
234 else {
235 printk ("EXT2-fs: Invalid errors option: %s\n",
236 value);
237 return 0;
238 }
239 }
240 else if (!strcmp (this_char, "grpid") ||
241 !strcmp (this_char, "bsdgroups"))
242 set_opt (*mount_options, GRPID);
243 else if (!strcmp (this_char, "minixdf"))
244 set_opt (*mount_options, MINIX_DF);
245 else if (!strcmp (this_char, "nocheck")) {
246 clear_opt (*mount_options, CHECK_NORMAL);
247 clear_opt (*mount_options, CHECK_STRICT);
248 }
249 else if (!strcmp (this_char, "nogrpid") ||
250 !strcmp (this_char, "sysvgroups"))
251 clear_opt (*mount_options, GRPID);
252 else if (!strcmp (this_char, "resgid")) {
253 if (!value || !*value) {
254 printk ("EXT2-fs: the resgid option requires "
255 "an argument");
256 return 0;
257 }
258 *resgid = simple_strtoul (value, &value, 0);
259 if (*value) {
260 printk ("EXT2-fs: Invalid resgid option: %s\n",
261 value);
262 return 0;
263 }
264 }
265 else if (!strcmp (this_char, "resuid")) {
266 if (!value || !*value) {
267 printk ("EXT2-fs: the resuid option requires "
268 "an argument");
269 return 0;
270 }
271 *resuid = simple_strtoul (value, &value, 0);
272 if (*value) {
273 printk ("EXT2-fs: Invalid resuid option: %s\n",
274 value);
275 return 0;
276 }
277 }
278 else if (!strcmp (this_char, "sb")) {
279 if (!value || !*value) {
280 printk ("EXT2-fs: the sb option requires "
281 "an argument");
282 return 0;
283 }
284 *sb_block = simple_strtoul (value, &value, 0);
285 if (*value) {
286 printk ("EXT2-fs: Invalid sb option: %s\n",
287 value);
288 return 0;
289 }
290 }
291 else {
292 printk ("EXT2-fs: Unrecognized mount option %s\n", this_char);
293 return 0;
294 }
295 }
296 return 1;
297 }
298
299 static void ext2_setup_super (struct super_block * sb,
300 struct ext2_super_block * es)
301 {
302 if (es->s_rev_level > EXT2_CURRENT_REV) {
303 printk ("EXT2-fs warning: revision level too high, "
304 "forcing read/only mode\n");
305 sb->s_flags |= MS_RDONLY;
306 }
307 if (!(sb->s_flags & MS_RDONLY)) {
308 if (!(sb->u.ext2_sb.s_mount_state & EXT2_VALID_FS))
309 printk ("EXT2-fs warning: mounting unchecked fs, "
310 "running e2fsck is recommended\n");
311 else if ((sb->u.ext2_sb.s_mount_state & EXT2_ERROR_FS))
312 printk ("EXT2-fs warning: mounting fs with errors, "
313 "running e2fsck is recommended\n");
314 else if (es->s_max_mnt_count >= 0 &&
315 es->s_mnt_count >= (unsigned short) es->s_max_mnt_count)
316 printk ("EXT2-fs warning: maximal mount count reached, "
317 "running e2fsck is recommended\n");
318 else if (es->s_checkinterval &&
319 (es->s_lastcheck + es->s_checkinterval <= CURRENT_TIME))
320 printk ("EXT2-fs warning: checktime reached, "
321 "running e2fsck is recommended\n");
322 es->s_state &= ~EXT2_VALID_FS;
323 if (!es->s_max_mnt_count)
324 es->s_max_mnt_count = EXT2_DFL_MAX_MNT_COUNT;
325 es->s_mnt_count++;
326 es->s_mtime = CURRENT_TIME;
327 mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
328 sb->s_dirt = 1;
329 if (test_opt (sb, DEBUG))
330 printk ("[EXT II FS %s, %s, bs=%lu, fs=%lu, gc=%lu, "
331 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
332 EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize,
333 sb->u.ext2_sb.s_frag_size,
334 sb->u.ext2_sb.s_groups_count,
335 EXT2_BLOCKS_PER_GROUP(sb),
336 EXT2_INODES_PER_GROUP(sb),
337 sb->u.ext2_sb.s_mount_opt);
338 if (test_opt (sb, CHECK)) {
339 ext2_check_blocks_bitmap (sb);
340 ext2_check_inodes_bitmap (sb);
341 }
342 }
343 }
344
345 static int ext2_check_descriptors (struct super_block * sb)
346 {
347 int i;
348 int desc_block = 0;
349 unsigned long block = sb->u.ext2_sb.s_es->s_first_data_block;
350 struct ext2_group_desc * gdp = NULL;
351
352 ext2_debug ("Checking group descriptors");
353
354 for (i = 0; i < sb->u.ext2_sb.s_groups_count; i++)
355 {
356 if ((i % EXT2_DESC_PER_BLOCK(sb)) == 0)
357 gdp = (struct ext2_group_desc *) sb->u.ext2_sb.s_group_desc[desc_block++]->b_data;
358 if (gdp->bg_block_bitmap < block ||
359 gdp->bg_block_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb))
360 {
361 ext2_error (sb, "ext2_check_descriptors",
362 "Block bitmap for group %d"
363 " not in group (block %lu)!",
364 i, (unsigned long) gdp->bg_block_bitmap);
365 return 0;
366 }
367 if (gdp->bg_inode_bitmap < block ||
368 gdp->bg_inode_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb))
369 {
370 ext2_error (sb, "ext2_check_descriptors",
371 "Inode bitmap for group %d"
372 " not in group (block %lu)!",
373 i, (unsigned long) gdp->bg_inode_bitmap);
374 return 0;
375 }
376 if (gdp->bg_inode_table < block ||
377 gdp->bg_inode_table + sb->u.ext2_sb.s_itb_per_group >=
378 block + EXT2_BLOCKS_PER_GROUP(sb))
379 {
380 ext2_error (sb, "ext2_check_descriptors",
381 "Inode table for group %d"
382 " not in group (block %lu)!",
383 i, (unsigned long) gdp->bg_inode_table);
384 return 0;
385 }
386 block += EXT2_BLOCKS_PER_GROUP(sb);
387 gdp++;
388 }
389 return 1;
390 }
391
392 #define log2(n) ffz(~(n))
393
394 struct super_block * ext2_read_super (struct super_block * sb, void * data,
395 int silent)
396 {
397 struct buffer_head * bh;
398 struct ext2_super_block * es;
399 unsigned long sb_block = 1;
400 unsigned short resuid = EXT2_DEF_RESUID;
401 unsigned short resgid = EXT2_DEF_RESGID;
402 unsigned long logic_sb_block = 1;
403 int dev = sb->s_dev;
404 int db_count;
405 int i, j;
406 #ifdef EXT2FS_PRE_02B_COMPAT
407 int fs_converted = 0;
408 #endif
409
410 set_opt (sb->u.ext2_sb.s_mount_opt, CHECK_NORMAL);
411 if (!parse_options ((char *) data, &sb_block, &resuid, &resgid,
412 &sb->u.ext2_sb.s_mount_opt)) {
413 sb->s_dev = 0;
414 return NULL;
415 }
416
417 lock_super (sb);
418 set_blocksize (dev, BLOCK_SIZE);
419 if (!(bh = bread (dev, sb_block, BLOCK_SIZE))) {
420 sb->s_dev = 0;
421 unlock_super (sb);
422 printk ("EXT2-fs: unable to read superblock\n");
423 return NULL;
424 }
425
426
427
428
429 es = (struct ext2_super_block *) bh->b_data;
430 sb->u.ext2_sb.s_es = es;
431 sb->s_magic = es->s_magic;
432 if (sb->s_magic != EXT2_SUPER_MAGIC
433 #ifdef EXT2FS_PRE_02B_COMPAT
434 && sb->s_magic != EXT2_PRE_02B_MAGIC
435 #endif
436 ) {
437 sb->s_dev = 0;
438 unlock_super (sb);
439 brelse (bh);
440 if (!silent)
441 printk ("VFS: Can't find an ext2 filesystem on dev %d/%d.\n",
442 MAJOR(dev), MINOR(dev));
443 return NULL;
444 }
445 sb->s_blocksize_bits = sb->u.ext2_sb.s_es->s_log_block_size + 10;
446 sb->s_blocksize = 1 << sb->s_blocksize_bits;
447 if (sb->s_blocksize != BLOCK_SIZE &&
448 (sb->s_blocksize == 1024 || sb->s_blocksize == 2048 ||
449 sb->s_blocksize == 4096)) {
450 unsigned long offset;
451
452 brelse (bh);
453 set_blocksize (dev, sb->s_blocksize);
454 logic_sb_block = (sb_block*BLOCK_SIZE) / sb->s_blocksize;
455 offset = (sb_block*BLOCK_SIZE) % sb->s_blocksize;
456 bh = bread (dev, logic_sb_block, sb->s_blocksize);
457 if(!bh)
458 return NULL;
459 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
460 sb->u.ext2_sb.s_es = es;
461 if (es->s_magic != EXT2_SUPER_MAGIC) {
462 sb->s_dev = 0;
463 unlock_super (sb);
464 brelse (bh);
465 printk ("EXT2-fs: Magic mismatch, very weird !\n");
466 return NULL;
467 }
468 }
469 sb->u.ext2_sb.s_frag_size = EXT2_MIN_FRAG_SIZE <<
470 es->s_log_frag_size;
471 if (sb->u.ext2_sb.s_frag_size)
472 sb->u.ext2_sb.s_frags_per_block = sb->s_blocksize /
473 sb->u.ext2_sb.s_frag_size;
474 else
475 sb->s_magic = 0;
476 sb->u.ext2_sb.s_blocks_per_group = es->s_blocks_per_group;
477 sb->u.ext2_sb.s_frags_per_group = es->s_frags_per_group;
478 sb->u.ext2_sb.s_inodes_per_group = es->s_inodes_per_group;
479 sb->u.ext2_sb.s_inodes_per_block = sb->s_blocksize /
480 sizeof (struct ext2_inode);
481 sb->u.ext2_sb.s_itb_per_group = sb->u.ext2_sb.s_inodes_per_group /
482 sb->u.ext2_sb.s_inodes_per_block;
483 sb->u.ext2_sb.s_desc_per_block = sb->s_blocksize /
484 sizeof (struct ext2_group_desc);
485 sb->u.ext2_sb.s_sbh = bh;
486 if (resuid != EXT2_DEF_RESUID)
487 sb->u.ext2_sb.s_resuid = resuid;
488 else
489 sb->u.ext2_sb.s_resuid = es->s_def_resuid;
490 if (resgid != EXT2_DEF_RESGID)
491 sb->u.ext2_sb.s_resgid = resgid;
492 else
493 sb->u.ext2_sb.s_resgid = es->s_def_resgid;
494 sb->u.ext2_sb.s_mount_state = es->s_state;
495 sb->u.ext2_sb.s_rename_lock = 0;
496 sb->u.ext2_sb.s_rename_wait = NULL;
497 sb->u.ext2_sb.s_addr_per_block_bits =
498 log2 (EXT2_ADDR_PER_BLOCK(sb));
499 sb->u.ext2_sb.s_inodes_per_block_bits =
500 log2 (EXT2_INODES_PER_BLOCK(sb));
501 sb->u.ext2_sb.s_desc_per_block_bits =
502 log2 (EXT2_DESC_PER_BLOCK(sb));
503 #ifdef EXT2FS_PRE_02B_COMPAT
504 if (sb->s_magic == EXT2_PRE_02B_MAGIC) {
505 if (es->s_blocks_count > 262144) {
506
507
508
509 sb->s_dev = 0;
510 unlock_super (sb);
511 brelse (bh);
512 printk ("EXT2-fs: trying to mount a pre-0.2b file"
513 "system which cannot be converted\n");
514 return NULL;
515 }
516 printk ("EXT2-fs: mounting a pre 0.2b file system, "
517 "will try to convert the structure\n");
518 if (!(sb->s_flags & MS_RDONLY)) {
519 sb->s_dev = 0;
520 unlock_super (sb);
521 brelse (bh);
522 printk ("EXT2-fs: cannot convert a read-only fs\n");
523 return NULL;
524 }
525 if (!convert_pre_02b_fs (sb, bh)) {
526 sb->s_dev = 0;
527 unlock_super (sb);
528 brelse (bh);
529 printk ("EXT2-fs: conversion failed !!!\n");
530 return NULL;
531 }
532 printk ("EXT2-fs: conversion succeeded !!!\n");
533 fs_converted = 1;
534 }
535 #endif
536 if (sb->s_magic != EXT2_SUPER_MAGIC) {
537 sb->s_dev = 0;
538 unlock_super (sb);
539 brelse (bh);
540 if (!silent)
541 printk ("VFS: Can't find an ext2 filesystem on dev %d/%d.\n",
542 MAJOR(dev), MINOR(dev));
543 return NULL;
544 }
545 if (sb->s_blocksize != bh->b_size) {
546 sb->s_dev = 0;
547 unlock_super (sb);
548 brelse (bh);
549 if (!silent)
550 printk ("VFS: Unsupported blocksize on dev 0x%04x.\n",
551 dev);
552 return NULL;
553 }
554
555 if (sb->s_blocksize != sb->u.ext2_sb.s_frag_size) {
556 sb->s_dev = 0;
557 unlock_super (sb);
558 brelse (bh);
559 printk ("EXT2-fs: fragsize %lu != blocksize %lu (not supported yet)\n",
560 sb->u.ext2_sb.s_frag_size, sb->s_blocksize);
561 return NULL;
562 }
563
564 if (sb->u.ext2_sb.s_blocks_per_group > sb->s_blocksize * 8) {
565 sb->s_dev = 0;
566 unlock_super (sb);
567 brelse (bh);
568 printk ("EXT2-fs: #blocks per group too big: %lu\n",
569 sb->u.ext2_sb.s_blocks_per_group);
570 return NULL;
571 }
572 if (sb->u.ext2_sb.s_frags_per_group > sb->s_blocksize * 8) {
573 sb->s_dev = 0;
574 unlock_super (sb);
575 brelse (bh);
576 printk ("EXT2-fs: #fragments per group too big: %lu\n",
577 sb->u.ext2_sb.s_frags_per_group);
578 return NULL;
579 }
580 if (sb->u.ext2_sb.s_inodes_per_group > sb->s_blocksize * 8) {
581 sb->s_dev = 0;
582 unlock_super (sb);
583 brelse (bh);
584 printk ("EXT2-fs: #inodes per group too big: %lu\n",
585 sb->u.ext2_sb.s_inodes_per_group);
586 return NULL;
587 }
588
589 sb->u.ext2_sb.s_groups_count = (es->s_blocks_count -
590 es->s_first_data_block +
591 EXT2_BLOCKS_PER_GROUP(sb) - 1) /
592 EXT2_BLOCKS_PER_GROUP(sb);
593 db_count = (sb->u.ext2_sb.s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) /
594 EXT2_DESC_PER_BLOCK(sb);
595 sb->u.ext2_sb.s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL);
596 if (sb->u.ext2_sb.s_group_desc == NULL) {
597 sb->s_dev = 0;
598 unlock_super (sb);
599 brelse (bh);
600 printk ("EXT2-fs: not enough memory\n");
601 return NULL;
602 }
603 for (i = 0; i < db_count; i++) {
604 sb->u.ext2_sb.s_group_desc[i] = bread (dev, logic_sb_block + i + 1,
605 sb->s_blocksize);
606 if (!sb->u.ext2_sb.s_group_desc[i]) {
607 sb->s_dev = 0;
608 unlock_super (sb);
609 for (j = 0; j < i; j++)
610 brelse (sb->u.ext2_sb.s_group_desc[j]);
611 kfree_s (sb->u.ext2_sb.s_group_desc,
612 db_count * sizeof (struct buffer_head *));
613 brelse (bh);
614 printk ("EXT2-fs: unable to read group descriptors\n");
615 return NULL;
616 }
617 }
618 if (!ext2_check_descriptors (sb)) {
619 sb->s_dev = 0;
620 unlock_super (sb);
621 for (j = 0; j < db_count; j++)
622 brelse (sb->u.ext2_sb.s_group_desc[j]);
623 kfree_s (sb->u.ext2_sb.s_group_desc,
624 db_count * sizeof (struct buffer_head *));
625 brelse (bh);
626 printk ("EXT2-fs: group descriptors corrupted !\n");
627 return NULL;
628 }
629 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++) {
630 sb->u.ext2_sb.s_inode_bitmap_number[i] = 0;
631 sb->u.ext2_sb.s_inode_bitmap[i] = NULL;
632 sb->u.ext2_sb.s_block_bitmap_number[i] = 0;
633 sb->u.ext2_sb.s_block_bitmap[i] = NULL;
634 }
635 sb->u.ext2_sb.s_loaded_inode_bitmaps = 0;
636 sb->u.ext2_sb.s_loaded_block_bitmaps = 0;
637 sb->u.ext2_sb.s_db_per_group = db_count;
638 unlock_super (sb);
639
640
641
642 sb->s_dev = dev;
643 sb->s_op = &ext2_sops;
644 if (!(sb->s_mounted = iget (sb, EXT2_ROOT_INO))) {
645 sb->s_dev = 0;
646 for (i = 0; i < db_count; i++)
647 if (sb->u.ext2_sb.s_group_desc[i])
648 brelse (sb->u.ext2_sb.s_group_desc[i]);
649 kfree_s (sb->u.ext2_sb.s_group_desc,
650 db_count * sizeof (struct buffer_head *));
651 brelse (bh);
652 printk ("EXT2-fs: get root inode failed\n");
653 return NULL;
654 }
655 #ifdef EXT2FS_PRE_02B_COMPAT
656 if (fs_converted) {
657 for (i = 0; i < db_count; i++)
658 mark_buffer_dirty(sb->u.ext2_sb.s_group_desc[i], 1);
659 sb->s_dirt = 1;
660 }
661 #endif
662 ext2_setup_super (sb, es);
663 return sb;
664 }
665
666 static void ext2_commit_super (struct super_block * sb,
667 struct ext2_super_block * es)
668 {
669 es->s_wtime = CURRENT_TIME;
670 mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
671 sb->s_dirt = 0;
672 }
673
674
675
676
677
678
679
680
681
682
683
684
685 void ext2_write_super (struct super_block * sb)
686 {
687 struct ext2_super_block * es;
688
689 if (!(sb->s_flags & MS_RDONLY)) {
690 es = sb->u.ext2_sb.s_es;
691
692 ext2_debug ("setting valid to 0\n");
693
694 if (es->s_state & EXT2_VALID_FS) {
695 es->s_state &= ~EXT2_VALID_FS;
696 es->s_mtime = CURRENT_TIME;
697 }
698 ext2_commit_super (sb, es);
699 }
700 sb->s_dirt = 0;
701 }
702
703 int ext2_remount (struct super_block * sb, int * flags, char * data)
704 {
705 struct ext2_super_block * es;
706 unsigned short resuid = sb->u.ext2_sb.s_resuid;
707 unsigned short resgid = sb->u.ext2_sb.s_resgid;
708 unsigned long new_mount_opt;
709 unsigned long tmp;
710
711
712
713
714 set_opt (sb->u.ext2_sb.s_mount_opt, CHECK_NORMAL);
715 if (!parse_options (data, &tmp, &resuid, &resgid,
716 &new_mount_opt))
717 return -EINVAL;
718
719 sb->u.ext2_sb.s_mount_opt = new_mount_opt;
720 sb->u.ext2_sb.s_resuid = resuid;
721 sb->u.ext2_sb.s_resgid = resgid;
722 es = sb->u.ext2_sb.s_es;
723 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
724 return 0;
725 if (*flags & MS_RDONLY) {
726 if (es->s_state & EXT2_VALID_FS ||
727 !(sb->u.ext2_sb.s_mount_state & EXT2_VALID_FS))
728 return 0;
729
730
731
732
733 es->s_state = sb->u.ext2_sb.s_mount_state;
734 es->s_mtime = CURRENT_TIME;
735 mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
736 sb->s_dirt = 1;
737 ext2_commit_super (sb, es);
738 }
739 else {
740
741
742
743
744
745 sb->u.ext2_sb.s_mount_state = es->s_state;
746 sb->s_flags &= ~MS_RDONLY;
747 ext2_setup_super (sb, es);
748 }
749 return 0;
750 }
751
752 void ext2_statfs (struct super_block * sb, struct statfs * buf, int bufsiz)
753 {
754 unsigned long overhead;
755 unsigned long overhead_per_group;
756 struct statfs tmp;
757
758 if (test_opt (sb, MINIX_DF))
759 overhead = 0;
760 else {
761
762
763
764 overhead_per_group = 1 +
765 sb->u.ext2_sb.s_db_per_group +
766 1 +
767 1 +
768 sb->u.ext2_sb.s_itb_per_group ;
769 overhead = sb->u.ext2_sb.s_es->s_first_data_block +
770 sb->u.ext2_sb.s_groups_count * overhead_per_group;
771 }
772
773 tmp.f_type = EXT2_SUPER_MAGIC;
774 tmp.f_bsize = sb->s_blocksize;
775 tmp.f_blocks = sb->u.ext2_sb.s_es->s_blocks_count - overhead;
776 tmp.f_bfree = ext2_count_free_blocks (sb);
777 tmp.f_bavail = tmp.f_bfree - sb->u.ext2_sb.s_es->s_r_blocks_count;
778 if (tmp.f_bfree < sb->u.ext2_sb.s_es->s_r_blocks_count)
779 tmp.f_bavail = 0;
780 tmp.f_files = sb->u.ext2_sb.s_es->s_inodes_count;
781 tmp.f_ffree = ext2_count_free_inodes (sb);
782 tmp.f_namelen = EXT2_NAME_LEN;
783 memcpy_tofs(buf, &tmp, bufsiz);
784 }
![[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}