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 #include <stdarg.h>
16
17 #include <asm/segment.h>
18 #include <asm/system.h>
19
20 #include <linux/errno.h>
21 #include <linux/fs.h>
22 #include <linux/ext2_fs.h>
23 #include <linux/sched.h>
24 #include <linux/stat.h>
25 #include <linux/string.h>
26 #include <linux/locks.h>
27
28 void ext2_error (struct super_block * sb, const char * function,
29 const char * fmt, ...)
30 {
31 char buf[1024];
32 va_list args;
33
34 if (!(sb->s_flags & MS_RDONLY)) {
35 sb->u.ext2_sb.s_mount_state |= EXT2_ERROR_FS;
36 sb->u.ext2_sb.s_es->s_state |= EXT2_ERROR_FS;
37 mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
38 sb->s_dirt = 1;
39 }
40 va_start (args, fmt);
41 vsprintf (buf, fmt, args);
42 va_end (args);
43 if (test_opt (sb, ERRORS_PANIC) ||
44 (sb->u.ext2_sb.s_es->s_errors == EXT2_ERRORS_PANIC &&
45 !test_opt (sb, ERRORS_CONT) && !test_opt (sb, ERRORS_RO)))
46 panic ("EXT2-fs panic (device %d/%d): %s: %s\n",
47 MAJOR(sb->s_dev), MINOR(sb->s_dev), function, buf);
48 printk (KERN_CRIT "EXT2-fs error (device %d/%d): %s: %s\n",
49 MAJOR(sb->s_dev), MINOR(sb->s_dev), function, buf);
50 if (test_opt (sb, ERRORS_RO) ||
51 (sb->u.ext2_sb.s_es->s_errors == EXT2_ERRORS_RO &&
52 !test_opt (sb, ERRORS_CONT) && !test_opt (sb, ERRORS_PANIC))) {
53 printk ("Remounting filesystem read-only\n");
54 sb->s_flags |= MS_RDONLY;
55 }
56 }
57
58 NORET_TYPE void ext2_panic (struct super_block * sb, const char * function,
59 const char * fmt, ...)
60 {
61 char buf[1024];
62 va_list args;
63
64 if (!(sb->s_flags & MS_RDONLY)) {
65 sb->u.ext2_sb.s_mount_state |= EXT2_ERROR_FS;
66 sb->u.ext2_sb.s_es->s_state |= EXT2_ERROR_FS;
67 mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
68 sb->s_dirt = 1;
69 }
70 va_start (args, fmt);
71 vsprintf (buf, fmt, args);
72 va_end (args);
73 panic ("EXT2-fs panic (device %d/%d): %s: %s\n",
74 MAJOR(sb->s_dev), MINOR(sb->s_dev), function, buf);
75 }
76
77 void ext2_warning (struct super_block * sb, const char * function,
78 const char * fmt, ...)
79 {
80 char buf[1024];
81 va_list args;
82
83 va_start (args, fmt);
84 vsprintf (buf, fmt, args);
85 va_end (args);
86 printk (KERN_WARNING "EXT2-fs warning (device %d/%d): %s: %s\n",
87 MAJOR(sb->s_dev), MINOR(sb->s_dev), function, buf);
88 }
89
90 void ext2_put_super (struct super_block * sb)
91 {
92 int i;
93
94 lock_super (sb);
95 if (!(sb->s_flags & MS_RDONLY)) {
96 sb->u.ext2_sb.s_es->s_state = sb->u.ext2_sb.s_mount_state;
97 mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
98 }
99 sb->s_dev = 0;
100 for (i = 0; i < EXT2_MAX_GROUP_DESC; i++)
101 if (sb->u.ext2_sb.s_group_desc[i])
102 brelse (sb->u.ext2_sb.s_group_desc[i]);
103 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
104 if (sb->u.ext2_sb.s_inode_bitmap[i])
105 brelse (sb->u.ext2_sb.s_inode_bitmap[i]);
106 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
107 if (sb->u.ext2_sb.s_block_bitmap[i])
108 brelse (sb->u.ext2_sb.s_block_bitmap[i]);
109 brelse (sb->u.ext2_sb.s_sbh);
110 unlock_super (sb);
111 return;
112 }
113
114 static struct super_operations ext2_sops = {
115 ext2_read_inode,
116 NULL,
117 ext2_write_inode,
118 ext2_put_inode,
119 ext2_put_super,
120 ext2_write_super,
121 ext2_statfs,
122 ext2_remount
123 };
124
125 #ifdef EXT2FS_PRE_02B_COMPAT
126
127 static int convert_pre_02b_fs (struct super_block * sb,
128 struct buffer_head * bh)
129 {
130 struct ext2_super_block * es;
131 struct ext2_old_group_desc old_group_desc [BLOCK_SIZE / sizeof (struct ext2_old_group_desc)];
132 struct ext2_group_desc * gdp;
133 struct buffer_head * bh2;
134 int groups_count;
135 int i;
136
137 es = (struct ext2_super_block *) bh->b_data;
138 bh2 = bread (sb->s_dev, 2, BLOCK_SIZE);
139 if (!bh2) {
140 printk ("Cannot read descriptor blocks while converting !\n");
141 return 0;
142 }
143 memcpy (old_group_desc, bh2->b_data, BLOCK_SIZE);
144 groups_count = (sb->u.ext2_sb.s_blocks_count -
145 sb->u.ext2_sb.s_first_data_block +
146 (EXT2_BLOCK_SIZE(sb) * 8) - 1) /
147 (EXT2_BLOCK_SIZE(sb) * 8);
148 memset (bh2->b_data, 0, BLOCK_SIZE);
149 gdp = (struct ext2_group_desc *) bh2->b_data;
150 for (i = 0; i < groups_count; i++) {
151 gdp[i].bg_block_bitmap = old_group_desc[i].bg_block_bitmap;
152 gdp[i].bg_inode_bitmap = old_group_desc[i].bg_inode_bitmap;
153 gdp[i].bg_inode_table = old_group_desc[i].bg_inode_table;
154 gdp[i].bg_free_blocks_count = old_group_desc[i].bg_free_blocks_count;
155 gdp[i].bg_free_inodes_count = old_group_desc[i].bg_free_inodes_count;
156 }
157 mark_buffer_dirty(bh2, 1);
158 brelse (bh2);
159 es->s_magic = EXT2_SUPER_MAGIC;
160 mark_buffer_dirty(bh, 1);
161 sb->s_magic = EXT2_SUPER_MAGIC;
162 return 1;
163 }
164
165 #endif
166
167
168
169
170 static int parse_options (char * options, unsigned long * sb_block,
171 unsigned long * mount_options)
172 {
173 char * this_char;
174 char * value;
175
176 if (!options)
177 return 1;
178 for (this_char = strtok (options, ",");
179 this_char != NULL;
180 this_char = strtok (NULL, ",")) {
181 if ((value = strchr (this_char, '=')) != NULL)
182 *value++ = 0;
183 if (!strcmp (this_char, "check")) {
184 if (!value || !*value)
185 set_opt (*mount_options, CHECK_NORMAL);
186 else if (!strcmp (value, "none")) {
187 clear_opt (*mount_options, CHECK_NORMAL);
188 clear_opt (*mount_options, CHECK_STRICT);
189 }
190 else if (strcmp (value, "normal"))
191 set_opt (*mount_options, CHECK_NORMAL);
192 else if (strcmp (value, "strict")) {
193 set_opt (*mount_options, CHECK_NORMAL);
194 set_opt (*mount_options, CHECK_STRICT);
195 }
196 else {
197 printk ("EXT2-fs: Invalid check option: %s\n",
198 value);
199 return 0;
200 }
201 }
202 else if (!strcmp (this_char, "debug"))
203 set_opt (*mount_options, DEBUG);
204 else if (!strcmp (this_char, "errors")) {
205 if (!value || !*value) {
206 printk ("EXT2-fs: the errors option requires "
207 "an argument");
208 return 0;
209 }
210 if (!strcmp (value, "continue")) {
211 clear_opt (*mount_options, ERRORS_RO);
212 clear_opt (*mount_options, ERRORS_PANIC);
213 set_opt (*mount_options, ERRORS_CONT);
214 }
215 else if (!strcmp (value, "remount-ro")) {
216 clear_opt (*mount_options, ERRORS_CONT);
217 clear_opt (*mount_options, ERRORS_PANIC);
218 set_opt (*mount_options, ERRORS_RO);
219 }
220 else if (!strcmp (value, "panic")) {
221 clear_opt (*mount_options, ERRORS_CONT);
222 clear_opt (*mount_options, ERRORS_RO);
223 set_opt (*mount_options, ERRORS_PANIC);
224 }
225 else {
226 printk ("EXT2-fs: Invalid errors option: %s\n",
227 value);
228 return 0;
229 }
230 }
231 else if (!strcmp (this_char, "grpid") ||
232 !strcmp (this_char, "bsdgroups"))
233 set_opt (*mount_options, GRPID);
234 else if (!strcmp (this_char, "nocheck")) {
235 clear_opt (*mount_options, CHECK_NORMAL);
236 clear_opt (*mount_options, CHECK_STRICT);
237 }
238 else if (!strcmp (this_char, "nogrpid") ||
239 !strcmp (this_char, "sysvgroups"))
240 clear_opt (*mount_options, GRPID);
241 else if (!strcmp (this_char, "sb")) {
242 if (!value || !*value) {
243 printk ("EXT2-fs: the sb option requires "
244 "an argument");
245 return 0;
246 }
247 *sb_block = simple_strtoul (value, &value, 0);
248 if (*value) {
249 printk ("EXT2-fs: Invalid sb option: %s\n",
250 value);
251 return 0;
252 }
253 }
254 else {
255 printk ("EXT2-fs: Unrecognized mount option %s\n", this_char);
256 return 0;
257 }
258 }
259 return 1;
260 }
261
262 static void ext2_setup_super (struct super_block * sb,
263 struct ext2_super_block * es)
264 {
265 if (!(sb->s_flags & MS_RDONLY)) {
266 if (!(sb->u.ext2_sb.s_mount_state & EXT2_VALID_FS))
267 printk ("EXT2-fs warning: mounting unchecked fs, "
268 "running e2fsck is recommended\n");
269 else if ((sb->u.ext2_sb.s_mount_state & EXT2_ERROR_FS))
270 printk ("EXT2-fs warning: mounting fs with errors, "
271 "running e2fsck is recommended\n");
272 else if (es->s_max_mnt_count >= 0 &&
273 es->s_mnt_count >= (unsigned short) es->s_max_mnt_count)
274 printk ("EXT2-fs warning: maximal mount count reached, "
275 "running e2fsck is recommended\n");
276 else if (es->s_checkinterval &&
277 (es->s_lastcheck + es->s_checkinterval <= CURRENT_TIME))
278 printk ("EXT2-fs warning: checktime reached, "
279 "running e2fsck is recommended\n");
280 es->s_state &= ~EXT2_VALID_FS;
281 if (!es->s_max_mnt_count)
282 es->s_max_mnt_count = EXT2_DFL_MAX_MNT_COUNT;
283 es->s_mnt_count++;
284 es->s_mtime = CURRENT_TIME;
285 mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
286 sb->s_dirt = 1;
287 if (test_opt (sb, DEBUG))
288 printk ("[EXT II FS %s, %s, bs=%lu, fs=%lu, gc=%lu, "
289 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
290 EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize,
291 sb->u.ext2_sb.s_frag_size,
292 sb->u.ext2_sb.s_groups_count,
293 EXT2_BLOCKS_PER_GROUP(sb),
294 EXT2_INODES_PER_GROUP(sb),
295 sb->u.ext2_sb.s_mount_opt);
296 if (test_opt (sb, CHECK)) {
297 ext2_check_blocks_bitmap (sb);
298 ext2_check_inodes_bitmap (sb);
299 }
300 }
301 }
302
303 static int ext2_check_descriptors (struct super_block * sb)
304 {
305 int i;
306 int desc_block = 0;
307 unsigned long block = sb->u.ext2_sb.s_es->s_first_data_block;
308 struct ext2_group_desc * gdp = NULL;
309
310 ext2_debug ("Checking group descriptors");
311
312 for (i = 0; i < sb->u.ext2_sb.s_groups_count; i++)
313 {
314 if ((i % EXT2_DESC_PER_BLOCK(sb)) == 0)
315 gdp = (struct ext2_group_desc *) sb->u.ext2_sb.s_group_desc[desc_block++]->b_data;
316 if (gdp->bg_block_bitmap < block ||
317 gdp->bg_block_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb))
318 {
319 ext2_error (sb, "ext2_check_desciptors",
320 "Block bitmap for group %d"
321 " not in group (block %lu)!",
322 i, gdp->bg_block_bitmap);
323 return 0;
324 }
325 if (gdp->bg_inode_bitmap < block ||
326 gdp->bg_inode_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb))
327 {
328 ext2_error (sb, "ext2_check_desciptors",
329 "Inode bitmap for group %d"
330 " not in group (block %lu)!",
331 i, gdp->bg_inode_bitmap);
332 return 0;
333 }
334 if (gdp->bg_inode_table < block ||
335 gdp->bg_inode_table + sb->u.ext2_sb.s_itb_per_group >=
336 block + EXT2_BLOCKS_PER_GROUP(sb))
337 {
338 ext2_error (sb, "ext2_check_desciptors",
339 "Inode table for group %d"
340 " not in group (block %lu)!",
341 i, gdp->bg_inode_table);
342 return 0;
343 }
344 block += EXT2_BLOCKS_PER_GROUP(sb);
345 gdp++;
346 }
347 return 1;
348 }
349
350 struct super_block * ext2_read_super (struct super_block * sb, void * data,
351 int silent)
352 {
353 struct buffer_head * bh;
354 struct ext2_super_block * es;
355 unsigned long sb_block = 1;
356 unsigned long logic_sb_block = 1;
357 int dev = sb->s_dev;
358 int bh_count;
359 int i, j;
360 #ifdef EXT2FS_PRE_02B_COMPAT
361 int fs_converted = 0;
362 #endif
363
364 set_opt (sb->u.ext2_sb.s_mount_opt, CHECK_NORMAL);
365 if (!parse_options ((char *) data, &sb_block,
366 &sb->u.ext2_sb.s_mount_opt)) {
367 sb->s_dev = 0;
368 return NULL;
369 }
370
371 lock_super (sb);
372 set_blocksize (dev, BLOCK_SIZE);
373 if (!(bh = bread (dev, sb_block, BLOCK_SIZE))) {
374 sb->s_dev = 0;
375 unlock_super (sb);
376 printk ("EXT2-fs: unable to read superblock\n");
377 return NULL;
378 }
379
380
381
382
383 es = (struct ext2_super_block *) bh->b_data;
384 sb->u.ext2_sb.s_es = es;
385 sb->s_magic = es->s_magic;
386 if (sb->s_magic != EXT2_SUPER_MAGIC
387 #ifdef EXT2FS_PRE_02B_COMPAT
388 && sb->s_magic != EXT2_PRE_02B_MAGIC
389 #endif
390 ) {
391 sb->s_dev = 0;
392 unlock_super (sb);
393 brelse (bh);
394 if (!silent)
395 printk ("VFS: Can't find an ext2 filesystem on dev %d/%d.\n",
396 MAJOR(dev), MINOR(dev));
397 return NULL;
398 }
399 sb->s_blocksize = EXT2_MIN_BLOCK_SIZE << es->s_log_block_size;
400 sb->s_blocksize_bits = EXT2_BLOCK_SIZE_BITS(sb);
401 if (sb->s_blocksize != BLOCK_SIZE &&
402 (sb->s_blocksize == 1024 || sb->s_blocksize == 2048 ||
403 sb->s_blocksize == 4096)) {
404 unsigned long offset;
405
406 brelse (bh);
407 set_blocksize (dev, sb->s_blocksize);
408 logic_sb_block = (sb_block*BLOCK_SIZE) / sb->s_blocksize;
409 offset = (sb_block*BLOCK_SIZE) % sb->s_blocksize;
410 bh = bread (dev, logic_sb_block, sb->s_blocksize);
411 if(!bh)
412 return NULL;
413 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
414 sb->u.ext2_sb.s_es = es;
415 if (es->s_magic != EXT2_SUPER_MAGIC) {
416 sb->s_dev = 0;
417 unlock_super (sb);
418 brelse (bh);
419 printk ("EXT2-fs: Magic mismatch, very weird !\n");
420 return NULL;
421 }
422 }
423 sb->u.ext2_sb.s_frag_size = EXT2_MIN_FRAG_SIZE <<
424 es->s_log_frag_size;
425 if (sb->u.ext2_sb.s_frag_size)
426 sb->u.ext2_sb.s_frags_per_block = sb->s_blocksize /
427 sb->u.ext2_sb.s_frag_size;
428 else
429 sb->s_magic = 0;
430 sb->u.ext2_sb.s_blocks_per_group = es->s_blocks_per_group;
431 sb->u.ext2_sb.s_frags_per_group = es->s_frags_per_group;
432 sb->u.ext2_sb.s_inodes_per_group = es->s_inodes_per_group;
433 sb->u.ext2_sb.s_inodes_per_block = sb->s_blocksize /
434 sizeof (struct ext2_inode);
435 sb->u.ext2_sb.s_itb_per_group = sb->u.ext2_sb.s_inodes_per_group /
436 sb->u.ext2_sb.s_inodes_per_block;
437 sb->u.ext2_sb.s_desc_per_block = sb->s_blocksize /
438 sizeof (struct ext2_group_desc);
439 sb->u.ext2_sb.s_sbh = bh;
440 sb->u.ext2_sb.s_es = es;
441 sb->u.ext2_sb.s_mount_state = es->s_state;
442 sb->u.ext2_sb.s_rename_lock = 0;
443 sb->u.ext2_sb.s_rename_wait = NULL;
444 #ifdef EXT2FS_PRE_02B_COMPAT
445 if (sb->s_magic == EXT2_PRE_02B_MAGIC) {
446 if (es->s_blocks_count > 262144) {
447
448
449
450 sb->s_dev = 0;
451 unlock_super (sb);
452 brelse (bh);
453 printk ("EXT2-fs: trying to mount a pre-0.2b file"
454 "system which cannot be converted\n");
455 return NULL;
456 }
457 printk ("EXT2-fs: mounting a pre 0.2b file system, "
458 "will try to convert the structure\n");
459 if (!(sb->s_flags & MS_RDONLY)) {
460 sb->s_dev = 0;
461 unlock_super (sb);
462 brelse (bh);
463 printk ("EXT2-fs: cannot convert a read-only fs\n");
464 return NULL;
465 }
466 if (!convert_pre_02b_fs (sb, bh)) {
467 sb->s_dev = 0;
468 unlock_super (sb);
469 brelse (bh);
470 printk ("EXT2-fs: conversion failed !!!\n");
471 return NULL;
472 }
473 printk ("EXT2-fs: conversion succeeded !!!\n");
474 fs_converted = 1;
475 }
476 #endif
477 if (sb->s_magic != EXT2_SUPER_MAGIC) {
478 sb->s_dev = 0;
479 unlock_super (sb);
480 brelse (bh);
481 if (!silent)
482 printk ("VFS: Can't find an ext2 filesystem on dev %d/%d.\n",
483 MAJOR(dev), MINOR(dev));
484 return NULL;
485 }
486 if (sb->s_blocksize != bh->b_size) {
487 sb->s_dev = 0;
488 unlock_super (sb);
489 brelse (bh);
490 if (!silent)
491 printk ("VFS: Unsupported blocksize on dev 0x%04x.\n",
492 dev);
493 return NULL;
494 }
495
496 if (sb->s_blocksize != sb->u.ext2_sb.s_frag_size) {
497 sb->s_dev = 0;
498 unlock_super (sb);
499 brelse (bh);
500 printk ("EXT2-fs: fragsize %lu != blocksize %lu (not supported yet)\n",
501 sb->u.ext2_sb.s_frag_size, sb->s_blocksize);
502 return NULL;
503 }
504
505 sb->u.ext2_sb.s_groups_count = (es->s_blocks_count -
506 es->s_first_data_block +
507 EXT2_BLOCKS_PER_GROUP(sb) - 1) /
508 EXT2_BLOCKS_PER_GROUP(sb);
509 for (i = 0; i < EXT2_MAX_GROUP_DESC; i++)
510 sb->u.ext2_sb.s_group_desc[i] = NULL;
511 bh_count = (sb->u.ext2_sb.s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) /
512 EXT2_DESC_PER_BLOCK(sb);
513 if (bh_count > EXT2_MAX_GROUP_DESC) {
514 sb->s_dev = 0;
515 unlock_super (sb);
516 brelse (bh);
517 printk ("EXT2-fs: file system is too big\n");
518 return NULL;
519 }
520 for (i = 0; i < bh_count; i++) {
521 sb->u.ext2_sb.s_group_desc[i] = bread (dev, logic_sb_block + i + 1,
522 sb->s_blocksize);
523 if (!sb->u.ext2_sb.s_group_desc[i]) {
524 sb->s_dev = 0;
525 unlock_super (sb);
526 for (j = 0; j < i; j++)
527 brelse (sb->u.ext2_sb.s_group_desc[j]);
528 brelse (bh);
529 printk ("EXT2-fs: unable to read group descriptors\n");
530 return NULL;
531 }
532 }
533 if (!ext2_check_descriptors (sb)) {
534 sb->s_dev = 0;
535 unlock_super (sb);
536 for (j = 0; j < i; j++)
537 brelse (sb->u.ext2_sb.s_group_desc[j]);
538 brelse (bh);
539 printk ("EXT2-fs: group descriptors corrupted !\n");
540 return NULL;
541 }
542 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++) {
543 sb->u.ext2_sb.s_inode_bitmap_number[i] = 0;
544 sb->u.ext2_sb.s_inode_bitmap[i] = NULL;
545 sb->u.ext2_sb.s_block_bitmap_number[i] = 0;
546 sb->u.ext2_sb.s_block_bitmap[i] = NULL;
547 }
548 sb->u.ext2_sb.s_loaded_inode_bitmaps = 0;
549 sb->u.ext2_sb.s_loaded_block_bitmaps = 0;
550 unlock_super (sb);
551
552
553
554 sb->s_dev = dev;
555 sb->s_op = &ext2_sops;
556 if (!(sb->s_mounted = iget (sb, EXT2_ROOT_INO))) {
557 sb->s_dev = 0;
558 for (i = 0; i < EXT2_MAX_GROUP_DESC; i++)
559 if (sb->u.ext2_sb.s_group_desc[i])
560 brelse (sb->u.ext2_sb.s_group_desc[i]);
561 brelse (bh);
562 printk ("EXT2-fs: get root inode failed\n");
563 return NULL;
564 }
565 #ifdef EXT2FS_PRE_02B_COMPAT
566 if (fs_converted) {
567 for (i = 0; i < bh_count; i++)
568 mark_buffer_dirty(sb->u.ext2_sb.s_group_desc[i], 1);
569 sb->s_dirt = 1;
570 }
571 #endif
572 ext2_setup_super (sb, es);
573 return sb;
574 }
575
576 static void ext2_commit_super (struct super_block * sb,
577 struct ext2_super_block * es)
578 {
579 es->s_wtime = CURRENT_TIME;
580 mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
581 sb->s_dirt = 0;
582 }
583
584
585
586
587
588
589
590
591
592
593
594
595 void ext2_write_super (struct super_block * sb)
596 {
597 struct ext2_super_block * es;
598
599 if (!(sb->s_flags & MS_RDONLY)) {
600 es = sb->u.ext2_sb.s_es;
601
602 ext2_debug ("setting valid to 0\n");
603
604 if (es->s_state & EXT2_VALID_FS) {
605 es->s_state &= ~EXT2_VALID_FS;
606 es->s_mtime = CURRENT_TIME;
607 }
608 ext2_commit_super (sb, es);
609 }
610 sb->s_dirt = 0;
611 }
612
613 int ext2_remount (struct super_block * sb, int * flags, char * data)
614 {
615 struct ext2_super_block * es;
616 unsigned long tmp;
617
618
619
620
621 set_opt (sb->u.ext2_sb.s_mount_opt, CHECK_NORMAL);
622 parse_options (data, &tmp, &sb->u.ext2_sb.s_mount_opt);
623
624 es = sb->u.ext2_sb.s_es;
625 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
626 return 0;
627 if (*flags & MS_RDONLY) {
628 if (es->s_state & EXT2_VALID_FS ||
629 !(sb->u.ext2_sb.s_mount_state & EXT2_VALID_FS))
630 return 0;
631
632
633
634
635 es->s_state = sb->u.ext2_sb.s_mount_state;
636 es->s_mtime = CURRENT_TIME;
637 mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
638 sb->s_dirt = 1;
639 ext2_commit_super (sb, es);
640 }
641 else {
642
643
644
645
646
647 sb->u.ext2_sb.s_mount_state = es->s_state;
648 sb->s_flags &= ~MS_RDONLY;
649 ext2_setup_super (sb, es);
650 }
651 return 0;
652 }
653
654 void ext2_statfs (struct super_block * sb, struct statfs * buf)
655 {
656 long tmp;
657
658 put_fs_long (EXT2_SUPER_MAGIC, &buf->f_type);
659 put_fs_long (sb->s_blocksize, &buf->f_bsize);
660 put_fs_long (sb->u.ext2_sb.s_es->s_blocks_count, &buf->f_blocks);
661 tmp = ext2_count_free_blocks (sb);
662 put_fs_long (tmp, &buf->f_bfree);
663 if (tmp >= sb->u.ext2_sb.s_es->s_r_blocks_count)
664 put_fs_long (tmp - sb->u.ext2_sb.s_es->s_r_blocks_count,
665 &buf->f_bavail);
666 else
667 put_fs_long (0, &buf->f_bavail);
668 put_fs_long (sb->u.ext2_sb.s_es->s_inodes_count, &buf->f_files);
669 put_fs_long (ext2_count_free_inodes (sb), &buf->f_ffree);
670 put_fs_long (EXT2_NAME_LEN, &buf->f_namelen);
671
672 }