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 extern int vsprintf (char *, const char *, va_list);
29
30 void ext2_error (struct super_block * sb, const char * function,
31 const char * fmt, ...)
32 {
33 char buf[1024];
34 va_list args;
35
36 if (!(sb->s_flags & MS_RDONLY)) {
37 sb->u.ext2_sb.s_mount_state |= EXT2_ERROR_FS;
38 sb->u.ext2_sb.s_es->s_state |= EXT2_ERROR_FS;
39 sb->u.ext2_sb.s_sbh->b_dirt = 1;
40 sb->s_dirt = 1;
41 }
42 va_start (args, fmt);
43 vsprintf (buf, fmt, args);
44 va_end (args);
45 if (test_opt (sb, ERRORS_PANIC) ||
46 (sb->u.ext2_sb.s_es->s_errors == EXT2_ERRORS_PANIC &&
47 !test_opt (sb, ERRORS_CONT) && !test_opt (sb, ERRORS_RO)))
48 panic ("EXT2-fs panic (device %d/%d): %s: %s\n",
49 MAJOR(sb->s_dev), MINOR(sb->s_dev), function, buf);
50 printk (KERN_CRIT "EXT2-fs error (device %d/%d): %s: %s\n",
51 MAJOR(sb->s_dev), MINOR(sb->s_dev), function, buf);
52 if (test_opt (sb, ERRORS_RO) ||
53 (sb->u.ext2_sb.s_es->s_errors == EXT2_ERRORS_RO &&
54 !test_opt (sb, ERRORS_CONT) && !test_opt (sb, ERRORS_PANIC))) {
55 printk ("Remounting filesystem read-only\n");
56 sb->s_flags |= MS_RDONLY;
57 }
58 }
59
60 NORET_TYPE void ext2_panic (struct super_block * sb, const char * function,
61 const char * fmt, ...)
62 {
63 char buf[1024];
64 va_list args;
65
66 if (!(sb->s_flags & MS_RDONLY)) {
67 sb->u.ext2_sb.s_mount_state |= EXT2_ERROR_FS;
68 sb->u.ext2_sb.s_es->s_state |= EXT2_ERROR_FS;
69 sb->u.ext2_sb.s_sbh->b_dirt = 1;
70 sb->s_dirt = 1;
71 }
72 va_start (args, fmt);
73 vsprintf (buf, fmt, args);
74 va_end (args);
75 panic ("EXT2-fs panic (device %d/%d): %s: %s\n",
76 MAJOR(sb->s_dev), MINOR(sb->s_dev), function, buf);
77 }
78
79 void ext2_warning (struct super_block * sb, const char * function,
80 const char * fmt, ...)
81 {
82 char buf[1024];
83 va_list args;
84
85 va_start (args, fmt);
86 vsprintf (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, buf);
90 }
91
92 void ext2_put_super (struct super_block * sb)
93 {
94 int i;
95
96 lock_super (sb);
97 if (!(sb->s_flags & MS_RDONLY)) {
98 sb->u.ext2_sb.s_es->s_state = sb->u.ext2_sb.s_mount_state;
99 sb->u.ext2_sb.s_sbh->b_dirt = 1;
100 }
101 #ifndef DONT_USE_DCACHE
102 ext2_dcache_invalidate (sb->s_dev);
103 #endif
104 sb->s_dev = 0;
105 for (i = 0; i < EXT2_MAX_GROUP_DESC; i++)
106 if (sb->u.ext2_sb.s_group_desc[i])
107 brelse (sb->u.ext2_sb.s_group_desc[i]);
108 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
109 if (sb->u.ext2_sb.s_inode_bitmap[i])
110 brelse (sb->u.ext2_sb.s_inode_bitmap[i]);
111 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
112 if (sb->u.ext2_sb.s_block_bitmap[i])
113 brelse (sb->u.ext2_sb.s_block_bitmap[i]);
114 brelse (sb->u.ext2_sb.s_sbh);
115 unlock_super (sb);
116 return;
117 }
118
119 static struct super_operations ext2_sops = {
120 ext2_read_inode,
121 NULL,
122 ext2_write_inode,
123 ext2_put_inode,
124 ext2_put_super,
125 ext2_write_super,
126 ext2_statfs,
127 ext2_remount
128 };
129
130 #ifdef EXT2FS_PRE_02B_COMPAT
131
132 static int convert_pre_02b_fs (struct super_block * sb,
133 struct buffer_head * bh)
134 {
135 struct ext2_super_block * es;
136 struct ext2_old_group_desc old_group_desc [BLOCK_SIZE / sizeof (struct ext2_old_group_desc)];
137 struct ext2_group_desc * gdp;
138 struct buffer_head * bh2;
139 int groups_count;
140 int i;
141
142 es = (struct ext2_super_block *) bh->b_data;
143 bh2 = bread (sb->s_dev, 2, BLOCK_SIZE);
144 if (!bh2) {
145 printk ("Cannot read descriptor blocks while converting !\n");
146 return 0;
147 }
148 memcpy (old_group_desc, bh2->b_data, BLOCK_SIZE);
149 groups_count = (sb->u.ext2_sb.s_blocks_count -
150 sb->u.ext2_sb.s_first_data_block +
151 (EXT2_BLOCK_SIZE(sb) * 8) - 1) /
152 (EXT2_BLOCK_SIZE(sb) * 8);
153 memset (bh2->b_data, 0, BLOCK_SIZE);
154 gdp = (struct ext2_group_desc *) bh2->b_data;
155 for (i = 0; i < groups_count; i++) {
156 gdp[i].bg_block_bitmap = old_group_desc[i].bg_block_bitmap;
157 gdp[i].bg_inode_bitmap = old_group_desc[i].bg_inode_bitmap;
158 gdp[i].bg_inode_table = old_group_desc[i].bg_inode_table;
159 gdp[i].bg_free_blocks_count = old_group_desc[i].bg_free_blocks_count;
160 gdp[i].bg_free_inodes_count = old_group_desc[i].bg_free_inodes_count;
161 }
162 bh2->b_dirt = 1;
163 brelse (bh2);
164 es->s_magic = EXT2_SUPER_MAGIC;
165 bh->b_dirt = 1;
166 sb->s_magic = EXT2_SUPER_MAGIC;
167 return 1;
168 }
169
170 #endif
171
172
173
174
175 static int parse_options (char * options, unsigned long * sb_block,
176 unsigned long * mount_options)
177 {
178 char * this_char;
179 char * value;
180
181 if (!options)
182 return 1;
183 for (this_char = strtok (options, ",");
184 this_char != NULL;
185 this_char = strtok (NULL, ",")) {
186 if ((value = strchr (this_char, '=')) != NULL)
187 *value++ = 0;
188 if (!strcmp (this_char, "check")) {
189 if (!value || !*value)
190 set_opt (*mount_options, CHECK_NORMAL);
191 else if (!strcmp (value, "none")) {
192 clear_opt (*mount_options, CHECK_NORMAL);
193 clear_opt (*mount_options, CHECK_STRICT);
194 }
195 else if (strcmp (value, "normal"))
196 set_opt (*mount_options, CHECK_NORMAL);
197 else if (strcmp (value, "strict")) {
198 set_opt (*mount_options, CHECK_NORMAL);
199 set_opt (*mount_options, CHECK_STRICT);
200 }
201 else {
202 printk ("EXT2-fs: Invalid check option: %s\n",
203 value);
204 return 0;
205 }
206 }
207 else if (!strcmp (this_char, "debug"))
208 set_opt (*mount_options, DEBUG);
209 else if (!strcmp (this_char, "errors")) {
210 if (!value || !*value) {
211 printk ("EXT2-fs: the errors option requires "
212 "an argument");
213 return 0;
214 }
215 if (!strcmp (value, "continue")) {
216 clear_opt (*mount_options, ERRORS_RO);
217 clear_opt (*mount_options, ERRORS_PANIC);
218 set_opt (*mount_options, ERRORS_CONT);
219 }
220 else if (!strcmp (value, "remount-ro")) {
221 clear_opt (*mount_options, ERRORS_CONT);
222 clear_opt (*mount_options, ERRORS_PANIC);
223 set_opt (*mount_options, ERRORS_RO);
224 }
225 else if (!strcmp (value, "panic")) {
226 clear_opt (*mount_options, ERRORS_CONT);
227 clear_opt (*mount_options, ERRORS_RO);
228 set_opt (*mount_options, ERRORS_PANIC);
229 }
230 else {
231 printk ("EXT2-fs: Invalid errors option: %s\n",
232 value);
233 return 0;
234 }
235 }
236 else if (!strcmp (this_char, "grpid"))
237 set_opt (*mount_options, GRPID);
238 else if (!strcmp (this_char, "nocheck")) {
239 clear_opt (*mount_options, CHECK_NORMAL);
240 clear_opt (*mount_options, CHECK_STRICT);
241 }
242 else if (!strcmp (this_char, "nogrpid"))
243 clear_opt (*mount_options, GRPID);
244 else if (!strcmp (this_char, "sb")) {
245 if (!value || !*value) {
246 printk ("EXT2-fs: the sb option requires "
247 "an argument");
248 return 0;
249 }
250 *sb_block = simple_strtoul (value, &value, 0);
251 if (*value) {
252 printk ("EXT2-fs: Invalid sb option: %s\n",
253 value);
254 return 0;
255 }
256 }
257 else {
258 printk ("EXT2-fs: Unrecognized mount option %s\n", this_char);
259 return 0;
260 }
261 }
262 return 1;
263 }
264
265 static void ext2_setup_super (struct super_block * sb,
266 struct ext2_super_block * es)
267 {
268 if (!(sb->u.ext2_sb.s_mount_state & EXT2_VALID_FS))
269 printk ("EXT2-fs warning: mounting unchecked fs, "
270 "running e2fsck is recommended\n");
271 else if ((sb->u.ext2_sb.s_mount_state & EXT2_ERROR_FS))
272 printk ("EXT2-fs warning: mounting fs with errors, "
273 "running e2fsck is recommended\n");
274 else if (es->s_mnt_count >= es->s_max_mnt_count)
275 printk ("EXT2-fs warning: maximal mount count reached, "
276 "running e2fsck is recommended\n");
277 if (!(sb->s_flags & MS_RDONLY)) {
278 es->s_state &= ~EXT2_VALID_FS;
279 if (!es->s_max_mnt_count)
280 es->s_max_mnt_count = EXT2_DFL_MAX_MNT_COUNT;
281 es->s_mnt_count++;
282 es->s_mtime = CURRENT_TIME;
283 sb->u.ext2_sb.s_sbh->b_dirt = 1;
284 sb->s_dirt = 1;
285 if (test_opt (sb, DEBUG))
286 printk ("[EXT II FS %s, %s, bs=%lu, fs=%lu, gc=%lu, "
287 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
288 EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize,
289 sb->u.ext2_sb.s_frag_size,
290 sb->u.ext2_sb.s_groups_count,
291 EXT2_BLOCKS_PER_GROUP(sb),
292 EXT2_INODES_PER_GROUP(sb),
293 sb->u.ext2_sb.s_mount_opt);
294 if (test_opt (sb, CHECK)) {
295 ext2_check_blocks_bitmap (sb);
296 ext2_check_inodes_bitmap (sb);
297 }
298 }
299 }
300
301 static int ext2_check_descriptors (struct super_block * sb)
302 {
303 int i;
304 int desc_block = 0;
305 unsigned long block = sb->u.ext2_sb.s_es->s_first_data_block;
306 struct ext2_group_desc * gdp = NULL;
307
308 ext2_debug ("Checking group descriptors");
309
310 for (i = 0; i < sb->u.ext2_sb.s_groups_count; i++)
311 {
312 if ((i % EXT2_DESC_PER_BLOCK(sb)) == 0)
313 gdp = (struct ext2_group_desc *) sb->u.ext2_sb.s_group_desc[desc_block++]->b_data;
314 if (gdp->bg_block_bitmap < block ||
315 gdp->bg_block_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb))
316 {
317 ext2_error (sb, "ext2_check_desciptors",
318 "Block bitmap for group %d"
319 " not in group (block %lu)!",
320 i, gdp->bg_block_bitmap);
321 return 0;
322 }
323 if (gdp->bg_inode_bitmap < block ||
324 gdp->bg_inode_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb))
325 {
326 ext2_error (sb, "ext2_check_desciptors",
327 "Inode bitmap for group %d"
328 " not in group (block %lu)!",
329 i, gdp->bg_inode_bitmap);
330 return 0;
331 }
332 if (gdp->bg_inode_table < block ||
333 gdp->bg_inode_table + sb->u.ext2_sb.s_itb_per_group >=
334 block + EXT2_BLOCKS_PER_GROUP(sb))
335 {
336 ext2_error (sb, "ext2_check_desciptors",
337 "Inode table for group %d"
338 " not in group (block %lu)!",
339 i, gdp->bg_inode_table);
340 return 0;
341 }
342 block += EXT2_BLOCKS_PER_GROUP(sb);
343 gdp++;
344 }
345 return 1;
346 }
347
348 struct super_block * ext2_read_super (struct super_block * sb, void * data,
349 int silent)
350 {
351 struct buffer_head * bh;
352 struct ext2_super_block * es;
353 unsigned long sb_block = 1;
354 unsigned long logic_sb_block = 1;
355 int dev = sb->s_dev;
356 int bh_count;
357 int i, j;
358 #ifdef EXT2FS_PRE_02B_COMPAT
359 int fs_converted = 0;
360 #endif
361
362 set_opt (sb->u.ext2_sb.s_mount_opt, CHECK_NORMAL);
363 if (!parse_options ((char *) data, &sb_block,
364 &sb->u.ext2_sb.s_mount_opt)) {
365 sb->s_dev = 0;
366 return NULL;
367 }
368
369 lock_super (sb);
370 set_blocksize (dev, BLOCK_SIZE);
371 if (!(bh = bread (dev, sb_block, BLOCK_SIZE))) {
372 sb->s_dev = 0;
373 unlock_super (sb);
374 printk ("EXT2-fs: unable to read superblock\n");
375 return NULL;
376 }
377
378
379
380
381 es = (struct ext2_super_block *) bh->b_data;
382 sb->u.ext2_sb.s_es = es;
383 sb->s_magic = es->s_magic;
384 if (sb->s_magic != EXT2_SUPER_MAGIC
385 #ifdef EXT2FS_PRE_02B_COMPAT
386 && sb->s_magic != EXT2_PRE_02B_MAGIC
387 #endif
388 ) {
389 sb->s_dev = 0;
390 unlock_super (sb);
391 brelse (bh);
392 if (!silent)
393 printk ("VFS: Can't find an ext2 filesystem on dev 0x%04x.\n",
394 dev);
395 return NULL;
396 }
397 sb->s_blocksize = EXT2_MIN_BLOCK_SIZE << es->s_log_block_size;
398 sb->s_blocksize_bits = EXT2_BLOCK_SIZE_BITS(sb);
399 if (sb->s_blocksize != BLOCK_SIZE &&
400 (sb->s_blocksize == 1024 || sb->s_blocksize == 2048 ||
401 sb->s_blocksize == 4096)) {
402 unsigned long offset;
403
404 brelse (bh);
405 set_blocksize (dev, sb->s_blocksize);
406 logic_sb_block = sb_block / sb->s_blocksize;
407 offset = sb_block % sb->s_blocksize;
408 bh = bread (dev, logic_sb_block, sb->s_blocksize);
409 if(!bh)
410 return NULL;
411 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
412 sb->u.ext2_sb.s_es = es;
413 if (es->s_magic != EXT2_SUPER_MAGIC) {
414 sb->s_dev = 0;
415 unlock_super (sb);
416 brelse (bh);
417 printk ("EXT2-fs: Magic mismatch, very weird !\n");
418 return NULL;
419 }
420 }
421 sb->u.ext2_sb.s_frag_size = EXT2_MIN_FRAG_SIZE <<
422 es->s_log_frag_size;
423 if (sb->u.ext2_sb.s_frag_size)
424 sb->u.ext2_sb.s_frags_per_block = sb->s_blocksize /
425 sb->u.ext2_sb.s_frag_size;
426 else
427 sb->s_magic = 0;
428 sb->u.ext2_sb.s_blocks_per_group = es->s_blocks_per_group;
429 sb->u.ext2_sb.s_frags_per_group = es->s_frags_per_group;
430 sb->u.ext2_sb.s_inodes_per_group = es->s_inodes_per_group;
431 sb->u.ext2_sb.s_inodes_per_block = sb->s_blocksize /
432 sizeof (struct ext2_inode);
433 sb->u.ext2_sb.s_itb_per_group = sb->u.ext2_sb.s_inodes_per_group /
434 sb->u.ext2_sb.s_inodes_per_block;
435 sb->u.ext2_sb.s_desc_per_block = sb->s_blocksize /
436 sizeof (struct ext2_group_desc);
437 sb->u.ext2_sb.s_sbh = bh;
438 sb->u.ext2_sb.s_es = es;
439 sb->u.ext2_sb.s_mount_state = es->s_state;
440 sb->u.ext2_sb.s_rename_lock = 0;
441 sb->u.ext2_sb.s_rename_wait = NULL;
442 #ifdef EXT2FS_PRE_02B_COMPAT
443 if (sb->s_magic == EXT2_PRE_02B_MAGIC) {
444 if (es->s_blocks_count > 262144) {
445
446
447
448 sb->s_dev = 0;
449 unlock_super (sb);
450 brelse (bh);
451 printk ("EXT2-fs: trying to mount a pre-0.2b file"
452 "system which cannot be converted\n");
453 return NULL;
454 }
455 printk ("EXT2-fs: mounting a pre 0.2b file system, "
456 "will try to convert the structure\n");
457 if (!(sb->s_flags & MS_RDONLY)) {
458 sb->s_dev = 0;
459 unlock_super (sb);
460 brelse (bh);
461 printk ("EXT2-fs: cannot convert a read-only fs\n");
462 return NULL;
463 }
464 if (!convert_pre_02b_fs (sb, bh)) {
465 sb->s_dev = 0;
466 unlock_super (sb);
467 brelse (bh);
468 printk ("EXT2-fs: conversion failed !!!\n");
469 return NULL;
470 }
471 printk ("EXT2-fs: conversion succeeded !!!\n");
472 fs_converted = 1;
473 }
474 #endif
475 if (sb->s_magic != EXT2_SUPER_MAGIC) {
476 sb->s_dev = 0;
477 unlock_super (sb);
478 brelse (bh);
479 if (!silent)
480 printk ("VFS: Can't find an ext2 filesystem on dev 0x%04x.\n",
481 dev);
482 return NULL;
483 }
484 if (sb->s_blocksize != bh->b_size) {
485 sb->s_dev = 0;
486 unlock_super (sb);
487 brelse (bh);
488 if (!silent)
489 printk ("VFS: Unsupported blocksize on dev 0x%04x.\n",
490 dev);
491 return NULL;
492 }
493
494 if (sb->s_blocksize != sb->u.ext2_sb.s_frag_size) {
495 sb->s_dev = 0;
496 unlock_super (sb);
497 brelse (bh);
498 printk ("EXT2-fs: fragsize %lu != blocksize %lu (not supported yet)\n",
499 sb->u.ext2_sb.s_frag_size, sb->s_blocksize);
500 return NULL;
501 }
502
503 sb->u.ext2_sb.s_groups_count = (es->s_blocks_count -
504 es->s_first_data_block +
505 EXT2_BLOCKS_PER_GROUP(sb) - 1) /
506 EXT2_BLOCKS_PER_GROUP(sb);
507 for (i = 0; i < EXT2_MAX_GROUP_DESC; i++)
508 sb->u.ext2_sb.s_group_desc[i] = NULL;
509 bh_count = (sb->u.ext2_sb.s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) /
510 EXT2_DESC_PER_BLOCK(sb);
511 if (bh_count > EXT2_MAX_GROUP_DESC) {
512 sb->s_dev = 0;
513 unlock_super (sb);
514 brelse (bh);
515 printk ("EXT2-fs: file system is too big\n");
516 return NULL;
517 }
518 for (i = 0; i < bh_count; i++) {
519 sb->u.ext2_sb.s_group_desc[i] = bread (dev, logic_sb_block + i + 1,
520 sb->s_blocksize);
521 if (!sb->u.ext2_sb.s_group_desc[i]) {
522 sb->s_dev = 0;
523 unlock_super (sb);
524 for (j = 0; j < i; j++)
525 brelse (sb->u.ext2_sb.s_group_desc[i]);
526 brelse (bh);
527 printk ("EXT2-fs: unable to read group descriptors\n");
528 return NULL;
529 }
530 }
531 if (!ext2_check_descriptors (sb)) {
532 sb->s_dev = 0;
533 unlock_super (sb);
534 for (j = 0; j < i; j++)
535 brelse (sb->u.ext2_sb.s_group_desc[i]);
536 brelse (bh);
537 printk ("EXT2-fs: group descriptors corrupted !\n");
538 return NULL;
539 }
540 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++) {
541 sb->u.ext2_sb.s_inode_bitmap_number[i] = 0;
542 sb->u.ext2_sb.s_inode_bitmap[i] = NULL;
543 sb->u.ext2_sb.s_block_bitmap_number[i] = 0;
544 sb->u.ext2_sb.s_block_bitmap[i] = NULL;
545 }
546 sb->u.ext2_sb.s_loaded_inode_bitmaps = 0;
547 sb->u.ext2_sb.s_loaded_block_bitmaps = 0;
548 unlock_super (sb);
549
550
551
552 sb->s_dev = dev;
553 sb->s_op = &ext2_sops;
554 if (!(sb->s_mounted = iget (sb, EXT2_ROOT_INO))) {
555 sb->s_dev = 0;
556 for (i = 0; i < EXT2_MAX_GROUP_DESC; i++)
557 if (sb->u.ext2_sb.s_group_desc[i])
558 brelse (sb->u.ext2_sb.s_group_desc[i]);
559 brelse (bh);
560 printk ("EXT2-fs: get root inode failed\n");
561 return NULL;
562 }
563 #ifdef EXT2FS_PRE_02B_COMPAT
564 if (fs_converted) {
565 for (i = 0; i < bh_count; i++)
566 sb->u.ext2_sb.s_group_desc[i]->b_dirt = 1;
567 sb->s_dirt = 1;
568 }
569 #endif
570 ext2_setup_super (sb, es);
571 return sb;
572 }
573
574 static void ext2_commit_super (struct super_block * sb,
575 struct ext2_super_block * es)
576 {
577 es->s_wtime = CURRENT_TIME;
578 sb->u.ext2_sb.s_sbh->b_dirt = 1;
579 sb->s_dirt = 0;
580 }
581
582
583
584
585
586
587
588
589
590
591
592
593 void ext2_write_super (struct super_block * sb)
594 {
595 struct ext2_super_block * es;
596
597 if (!(sb->s_flags & MS_RDONLY)) {
598 es = sb->u.ext2_sb.s_es;
599
600 ext2_debug ("setting valid to 0\n");
601
602 if (es->s_state & EXT2_VALID_FS) {
603 es->s_state &= ~EXT2_VALID_FS;
604 es->s_mtime = CURRENT_TIME;
605 }
606 ext2_commit_super (sb, es);
607 }
608 sb->s_dirt = 0;
609 }
610
611 int ext2_remount (struct super_block * sb, int * flags, char * data)
612 {
613 struct ext2_super_block * es;
614 unsigned long tmp;
615
616
617
618
619 set_opt (sb->u.ext2_sb.s_mount_opt, CHECK_NORMAL);
620 parse_options (data, &tmp, &sb->u.ext2_sb.s_mount_opt);
621
622 es = sb->u.ext2_sb.s_es;
623 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
624 return 0;
625 if (*flags & MS_RDONLY) {
626 if (es->s_state & EXT2_VALID_FS ||
627 !(sb->u.ext2_sb.s_mount_state & EXT2_VALID_FS))
628 return 0;
629
630
631
632
633 es->s_state = sb->u.ext2_sb.s_mount_state;
634 es->s_mtime = CURRENT_TIME;
635 sb->u.ext2_sb.s_sbh->b_dirt = 1;
636 sb->s_dirt = 1;
637 ext2_commit_super (sb, es);
638 }
639 else {
640
641
642
643
644
645 sb->u.ext2_sb.s_mount_state = es->s_state;
646 sb->s_flags &= ~MS_RDONLY;
647 ext2_setup_super (sb, es);
648 }
649 return 0;
650 }
651
652 void ext2_statfs (struct super_block * sb, struct statfs * buf)
653 {
654 long tmp;
655
656 put_fs_long (EXT2_SUPER_MAGIC, &buf->f_type);
657 put_fs_long (sb->s_blocksize, &buf->f_bsize);
658 put_fs_long (sb->u.ext2_sb.s_es->s_blocks_count, &buf->f_blocks);
659 tmp = ext2_count_free_blocks (sb);
660 put_fs_long (tmp, &buf->f_bfree);
661 if (tmp >= sb->u.ext2_sb.s_es->s_r_blocks_count)
662 put_fs_long (tmp - sb->u.ext2_sb.s_es->s_r_blocks_count,
663 &buf->f_bavail);
664 else
665 put_fs_long (0, &buf->f_bavail);
666 put_fs_long (sb->u.ext2_sb.s_es->s_inodes_count, &buf->f_files);
667 put_fs_long (ext2_count_free_inodes (sb), &buf->f_ffree);
668 put_fs_long (EXT2_NAME_LEN, &buf->f_namelen);
669
670 }