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
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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/malloc.h>
24 #include <linux/sched.h>
25 #include <linux/stat.h>
26 #include <linux/string.h>
27 #include <linux/locks.h>
28
29 void ext2_error (struct super_block * sb, const char * function,
30 const char * fmt, ...)
31 {
32 char buf[1024];
33 va_list args;
34
35 if (!(sb->s_flags & MS_RDONLY)) {
36 sb->u.ext2_sb.s_mount_state |= EXT2_ERROR_FS;
37 sb->u.ext2_sb.s_es->s_state |= EXT2_ERROR_FS;
38 mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
39 sb->s_dirt = 1;
40 }
41 va_start (args, fmt);
42 vsprintf (buf, fmt, args);
43 va_end (args);
44 if (test_opt (sb, ERRORS_PANIC) ||
45 (sb->u.ext2_sb.s_es->s_errors == EXT2_ERRORS_PANIC &&
46 !test_opt (sb, ERRORS_CONT) && !test_opt (sb, ERRORS_RO)))
47 panic ("EXT2-fs panic (device %d/%d): %s: %s\n",
48 MAJOR(sb->s_dev), MINOR(sb->s_dev), function, buf);
49 printk (KERN_CRIT "EXT2-fs error (device %d/%d): %s: %s\n",
50 MAJOR(sb->s_dev), MINOR(sb->s_dev), function, buf);
51 if (test_opt (sb, ERRORS_RO) ||
52 (sb->u.ext2_sb.s_es->s_errors == EXT2_ERRORS_RO &&
53 !test_opt (sb, ERRORS_CONT) && !test_opt (sb, ERRORS_PANIC))) {
54 printk ("Remounting filesystem read-only\n");
55 sb->s_flags |= MS_RDONLY;
56 }
57 }
58
59 NORET_TYPE void ext2_panic (struct super_block * sb, const char * function,
60 const char * fmt, ...)
61 {
62 char buf[1024];
63 va_list args;
64
65 if (!(sb->s_flags & MS_RDONLY)) {
66 sb->u.ext2_sb.s_mount_state |= EXT2_ERROR_FS;
67 sb->u.ext2_sb.s_es->s_state |= EXT2_ERROR_FS;
68 mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
69 sb->s_dirt = 1;
70 }
71 va_start (args, fmt);
72 vsprintf (buf, fmt, args);
73 va_end (args);
74 panic ("EXT2-fs panic (device %d/%d): %s: %s\n",
75 MAJOR(sb->s_dev), MINOR(sb->s_dev), function, buf);
76 }
77
78 void ext2_warning (struct super_block * sb, const char * function,
79 const char * fmt, ...)
80 {
81 char buf[1024];
82 va_list args;
83
84 va_start (args, fmt);
85 vsprintf (buf, fmt, args);
86 va_end (args);
87 printk (KERN_WARNING "EXT2-fs warning (device %d/%d): %s: %s\n",
88 MAJOR(sb->s_dev), MINOR(sb->s_dev), function, buf);
89 }
90
91 void ext2_put_super (struct super_block * sb)
92 {
93 int db_count;
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 mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
100 }
101 sb->s_dev = 0;
102 db_count = sb->u.ext2_sb.s_db_per_group;
103 for (i = 0; i < db_count; i++)
104 if (sb->u.ext2_sb.s_group_desc[i])
105 brelse (sb->u.ext2_sb.s_group_desc[i]);
106 kfree_s (sb->u.ext2_sb.s_group_desc,
107 db_count * sizeof (struct buffer_head *));
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 mark_buffer_dirty(bh2, 1);
163 brelse (bh2);
164 es->s_magic = EXT2_SUPER_MAGIC;
165 mark_buffer_dirty(bh, 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, "bsddf"))
189 clear_opt (*mount_options, MINIX_DF);
190 else if (!strcmp (this_char, "check")) {
191 if (!value || !*value)
192 set_opt (*mount_options, CHECK_NORMAL);
193 else if (!strcmp (value, "none")) {
194 clear_opt (*mount_options, CHECK_NORMAL);
195 clear_opt (*mount_options, CHECK_STRICT);
196 }
197 else if (strcmp (value, "normal"))
198 set_opt (*mount_options, CHECK_NORMAL);
199 else if (strcmp (value, "strict")) {
200 set_opt (*mount_options, CHECK_NORMAL);
201 set_opt (*mount_options, CHECK_STRICT);
202 }
203 else {
204 printk ("EXT2-fs: Invalid check option: %s\n",
205 value);
206 return 0;
207 }
208 }
209 else if (!strcmp (this_char, "debug"))
210 set_opt (*mount_options, DEBUG);
211 else if (!strcmp (this_char, "errors")) {
212 if (!value || !*value) {
213 printk ("EXT2-fs: the errors option requires "
214 "an argument");
215 return 0;
216 }
217 if (!strcmp (value, "continue")) {
218 clear_opt (*mount_options, ERRORS_RO);
219 clear_opt (*mount_options, ERRORS_PANIC);
220 set_opt (*mount_options, ERRORS_CONT);
221 }
222 else if (!strcmp (value, "remount-ro")) {
223 clear_opt (*mount_options, ERRORS_CONT);
224 clear_opt (*mount_options, ERRORS_PANIC);
225 set_opt (*mount_options, ERRORS_RO);
226 }
227 else if (!strcmp (value, "panic")) {
228 clear_opt (*mount_options, ERRORS_CONT);
229 clear_opt (*mount_options, ERRORS_RO);
230 set_opt (*mount_options, ERRORS_PANIC);
231 }
232 else {
233 printk ("EXT2-fs: Invalid errors option: %s\n",
234 value);
235 return 0;
236 }
237 }
238 else if (!strcmp (this_char, "grpid") ||
239 !strcmp (this_char, "bsdgroups"))
240 set_opt (*mount_options, GRPID);
241 else if (!strcmp (this_char, "minixdf"))
242 set_opt (*mount_options, MINIX_DF);
243 else if (!strcmp (this_char, "nocheck")) {
244 clear_opt (*mount_options, CHECK_NORMAL);
245 clear_opt (*mount_options, CHECK_STRICT);
246 }
247 else if (!strcmp (this_char, "nogrpid") ||
248 !strcmp (this_char, "sysvgroups"))
249 clear_opt (*mount_options, GRPID);
250 else if (!strcmp (this_char, "sb")) {
251 if (!value || !*value) {
252 printk ("EXT2-fs: the sb option requires "
253 "an argument");
254 return 0;
255 }
256 *sb_block = simple_strtoul (value, &value, 0);
257 if (*value) {
258 printk ("EXT2-fs: Invalid sb option: %s\n",
259 value);
260 return 0;
261 }
262 }
263 else {
264 printk ("EXT2-fs: Unrecognized mount option %s\n", this_char);
265 return 0;
266 }
267 }
268 return 1;
269 }
270
271 static void ext2_setup_super (struct super_block * sb,
272 struct ext2_super_block * es)
273 {
274 if (es->s_rev_level > EXT2_CURRENT_REV) {
275 printk ("EXT2-fs warning: revision level too high, "
276 "forcing read/only mode\n");
277 sb->s_flags |= MS_RDONLY;
278 }
279 if (!(sb->s_flags & MS_RDONLY)) {
280 if (!(sb->u.ext2_sb.s_mount_state & EXT2_VALID_FS))
281 printk ("EXT2-fs warning: mounting unchecked fs, "
282 "running e2fsck is recommended\n");
283 else if ((sb->u.ext2_sb.s_mount_state & EXT2_ERROR_FS))
284 printk ("EXT2-fs warning: mounting fs with errors, "
285 "running e2fsck is recommended\n");
286 else if (es->s_max_mnt_count >= 0 &&
287 es->s_mnt_count >= (unsigned short) es->s_max_mnt_count)
288 printk ("EXT2-fs warning: maximal mount count reached, "
289 "running e2fsck is recommended\n");
290 else if (es->s_checkinterval &&
291 (es->s_lastcheck + es->s_checkinterval <= CURRENT_TIME))
292 printk ("EXT2-fs warning: checktime reached, "
293 "running e2fsck is recommended\n");
294 es->s_state &= ~EXT2_VALID_FS;
295 if (!es->s_max_mnt_count)
296 es->s_max_mnt_count = EXT2_DFL_MAX_MNT_COUNT;
297 es->s_mnt_count++;
298 es->s_mtime = CURRENT_TIME;
299 mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
300 sb->s_dirt = 1;
301 if (test_opt (sb, DEBUG))
302 printk ("[EXT II FS %s, %s, bs=%lu, fs=%lu, gc=%lu, "
303 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
304 EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize,
305 sb->u.ext2_sb.s_frag_size,
306 sb->u.ext2_sb.s_groups_count,
307 EXT2_BLOCKS_PER_GROUP(sb),
308 EXT2_INODES_PER_GROUP(sb),
309 sb->u.ext2_sb.s_mount_opt);
310 if (test_opt (sb, CHECK)) {
311 ext2_check_blocks_bitmap (sb);
312 ext2_check_inodes_bitmap (sb);
313 }
314 }
315 }
316
317 static int ext2_check_descriptors (struct super_block * sb)
318 {
319 int i;
320 int desc_block = 0;
321 unsigned long block = sb->u.ext2_sb.s_es->s_first_data_block;
322 struct ext2_group_desc * gdp = NULL;
323
324 ext2_debug ("Checking group descriptors");
325
326 for (i = 0; i < sb->u.ext2_sb.s_groups_count; i++)
327 {
328 if ((i % EXT2_DESC_PER_BLOCK(sb)) == 0)
329 gdp = (struct ext2_group_desc *) sb->u.ext2_sb.s_group_desc[desc_block++]->b_data;
330 if (gdp->bg_block_bitmap < block ||
331 gdp->bg_block_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb))
332 {
333 ext2_error (sb, "ext2_check_descriptors",
334 "Block bitmap for group %d"
335 " not in group (block %lu)!",
336 i, gdp->bg_block_bitmap);
337 return 0;
338 }
339 if (gdp->bg_inode_bitmap < block ||
340 gdp->bg_inode_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb))
341 {
342 ext2_error (sb, "ext2_check_descriptors",
343 "Inode bitmap for group %d"
344 " not in group (block %lu)!",
345 i, gdp->bg_inode_bitmap);
346 return 0;
347 }
348 if (gdp->bg_inode_table < block ||
349 gdp->bg_inode_table + sb->u.ext2_sb.s_itb_per_group >=
350 block + EXT2_BLOCKS_PER_GROUP(sb))
351 {
352 ext2_error (sb, "ext2_check_descriptors",
353 "Inode table for group %d"
354 " not in group (block %lu)!",
355 i, gdp->bg_inode_table);
356 return 0;
357 }
358 block += EXT2_BLOCKS_PER_GROUP(sb);
359 gdp++;
360 }
361 return 1;
362 }
363
364 struct super_block * ext2_read_super (struct super_block * sb, void * data,
365 int silent)
366 {
367 struct buffer_head * bh;
368 struct ext2_super_block * es;
369 unsigned long sb_block = 1;
370 unsigned long logic_sb_block = 1;
371 int dev = sb->s_dev;
372 int db_count;
373 int i, j;
374 #ifdef EXT2FS_PRE_02B_COMPAT
375 int fs_converted = 0;
376 #endif
377
378 set_opt (sb->u.ext2_sb.s_mount_opt, CHECK_NORMAL);
379 if (!parse_options ((char *) data, &sb_block,
380 &sb->u.ext2_sb.s_mount_opt)) {
381 sb->s_dev = 0;
382 return NULL;
383 }
384
385 lock_super (sb);
386 set_blocksize (dev, BLOCK_SIZE);
387 if (!(bh = bread (dev, sb_block, BLOCK_SIZE))) {
388 sb->s_dev = 0;
389 unlock_super (sb);
390 printk ("EXT2-fs: unable to read superblock\n");
391 return NULL;
392 }
393
394
395
396
397 es = (struct ext2_super_block *) bh->b_data;
398 sb->u.ext2_sb.s_es = es;
399 sb->s_magic = es->s_magic;
400 if (sb->s_magic != EXT2_SUPER_MAGIC
401 #ifdef EXT2FS_PRE_02B_COMPAT
402 && sb->s_magic != EXT2_PRE_02B_MAGIC
403 #endif
404 ) {
405 sb->s_dev = 0;
406 unlock_super (sb);
407 brelse (bh);
408 if (!silent)
409 printk ("VFS: Can't find an ext2 filesystem on dev %d/%d.\n",
410 MAJOR(dev), MINOR(dev));
411 return NULL;
412 }
413 sb->s_blocksize = EXT2_MIN_BLOCK_SIZE << es->s_log_block_size;
414 sb->s_blocksize_bits = EXT2_BLOCK_SIZE_BITS(sb);
415 if (sb->s_blocksize != BLOCK_SIZE &&
416 (sb->s_blocksize == 1024 || sb->s_blocksize == 2048 ||
417 sb->s_blocksize == 4096)) {
418 unsigned long offset;
419
420 brelse (bh);
421 set_blocksize (dev, sb->s_blocksize);
422 logic_sb_block = (sb_block*BLOCK_SIZE) / sb->s_blocksize;
423 offset = (sb_block*BLOCK_SIZE) % sb->s_blocksize;
424 bh = bread (dev, logic_sb_block, sb->s_blocksize);
425 if(!bh)
426 return NULL;
427 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
428 sb->u.ext2_sb.s_es = es;
429 if (es->s_magic != EXT2_SUPER_MAGIC) {
430 sb->s_dev = 0;
431 unlock_super (sb);
432 brelse (bh);
433 printk ("EXT2-fs: Magic mismatch, very weird !\n");
434 return NULL;
435 }
436 }
437 sb->u.ext2_sb.s_frag_size = EXT2_MIN_FRAG_SIZE <<
438 es->s_log_frag_size;
439 if (sb->u.ext2_sb.s_frag_size)
440 sb->u.ext2_sb.s_frags_per_block = sb->s_blocksize /
441 sb->u.ext2_sb.s_frag_size;
442 else
443 sb->s_magic = 0;
444 sb->u.ext2_sb.s_blocks_per_group = es->s_blocks_per_group;
445 sb->u.ext2_sb.s_frags_per_group = es->s_frags_per_group;
446 sb->u.ext2_sb.s_inodes_per_group = es->s_inodes_per_group;
447 sb->u.ext2_sb.s_inodes_per_block = sb->s_blocksize /
448 sizeof (struct ext2_inode);
449 sb->u.ext2_sb.s_itb_per_group = sb->u.ext2_sb.s_inodes_per_group /
450 sb->u.ext2_sb.s_inodes_per_block;
451 sb->u.ext2_sb.s_desc_per_block = sb->s_blocksize /
452 sizeof (struct ext2_group_desc);
453 sb->u.ext2_sb.s_sbh = bh;
454 sb->u.ext2_sb.s_es = es;
455 sb->u.ext2_sb.s_mount_state = es->s_state;
456 sb->u.ext2_sb.s_rename_lock = 0;
457 sb->u.ext2_sb.s_rename_wait = NULL;
458 #ifdef EXT2FS_PRE_02B_COMPAT
459 if (sb->s_magic == EXT2_PRE_02B_MAGIC) {
460 if (es->s_blocks_count > 262144) {
461
462
463
464 sb->s_dev = 0;
465 unlock_super (sb);
466 brelse (bh);
467 printk ("EXT2-fs: trying to mount a pre-0.2b file"
468 "system which cannot be converted\n");
469 return NULL;
470 }
471 printk ("EXT2-fs: mounting a pre 0.2b file system, "
472 "will try to convert the structure\n");
473 if (!(sb->s_flags & MS_RDONLY)) {
474 sb->s_dev = 0;
475 unlock_super (sb);
476 brelse (bh);
477 printk ("EXT2-fs: cannot convert a read-only fs\n");
478 return NULL;
479 }
480 if (!convert_pre_02b_fs (sb, bh)) {
481 sb->s_dev = 0;
482 unlock_super (sb);
483 brelse (bh);
484 printk ("EXT2-fs: conversion failed !!!\n");
485 return NULL;
486 }
487 printk ("EXT2-fs: conversion succeeded !!!\n");
488 fs_converted = 1;
489 }
490 #endif
491 if (sb->s_magic != EXT2_SUPER_MAGIC) {
492 sb->s_dev = 0;
493 unlock_super (sb);
494 brelse (bh);
495 if (!silent)
496 printk ("VFS: Can't find an ext2 filesystem on dev %d/%d.\n",
497 MAJOR(dev), MINOR(dev));
498 return NULL;
499 }
500 if (sb->s_blocksize != bh->b_size) {
501 sb->s_dev = 0;
502 unlock_super (sb);
503 brelse (bh);
504 if (!silent)
505 printk ("VFS: Unsupported blocksize on dev 0x%04x.\n",
506 dev);
507 return NULL;
508 }
509
510 if (sb->s_blocksize != sb->u.ext2_sb.s_frag_size) {
511 sb->s_dev = 0;
512 unlock_super (sb);
513 brelse (bh);
514 printk ("EXT2-fs: fragsize %lu != blocksize %lu (not supported yet)\n",
515 sb->u.ext2_sb.s_frag_size, sb->s_blocksize);
516 return NULL;
517 }
518
519 sb->u.ext2_sb.s_groups_count = (es->s_blocks_count -
520 es->s_first_data_block +
521 EXT2_BLOCKS_PER_GROUP(sb) - 1) /
522 EXT2_BLOCKS_PER_GROUP(sb);
523 db_count = (sb->u.ext2_sb.s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) /
524 EXT2_DESC_PER_BLOCK(sb);
525 sb->u.ext2_sb.s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL);
526 if (sb->u.ext2_sb.s_group_desc == NULL) {
527 sb->s_dev = 0;
528 unlock_super (sb);
529 brelse (bh);
530 printk ("EXT2-fs: not enough memory\n");
531 return NULL;
532 }
533 for (i = 0; i < db_count; i++) {
534 sb->u.ext2_sb.s_group_desc[i] = bread (dev, logic_sb_block + i + 1,
535 sb->s_blocksize);
536 if (!sb->u.ext2_sb.s_group_desc[i]) {
537 sb->s_dev = 0;
538 unlock_super (sb);
539 for (j = 0; j < i; j++)
540 brelse (sb->u.ext2_sb.s_group_desc[j]);
541 kfree_s (sb->u.ext2_sb.s_group_desc,
542 db_count * sizeof (struct buffer_head *));
543 brelse (bh);
544 printk ("EXT2-fs: unable to read group descriptors\n");
545 return NULL;
546 }
547 }
548 if (!ext2_check_descriptors (sb)) {
549 sb->s_dev = 0;
550 unlock_super (sb);
551 for (j = 0; j < db_count; j++)
552 brelse (sb->u.ext2_sb.s_group_desc[j]);
553 kfree_s (sb->u.ext2_sb.s_group_desc,
554 db_count * sizeof (struct buffer_head *));
555 brelse (bh);
556 printk ("EXT2-fs: group descriptors corrupted !\n");
557 return NULL;
558 }
559 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++) {
560 sb->u.ext2_sb.s_inode_bitmap_number[i] = 0;
561 sb->u.ext2_sb.s_inode_bitmap[i] = NULL;
562 sb->u.ext2_sb.s_block_bitmap_number[i] = 0;
563 sb->u.ext2_sb.s_block_bitmap[i] = NULL;
564 }
565 sb->u.ext2_sb.s_loaded_inode_bitmaps = 0;
566 sb->u.ext2_sb.s_loaded_block_bitmaps = 0;
567 sb->u.ext2_sb.s_db_per_group = db_count;
568 unlock_super (sb);
569
570
571
572 sb->s_dev = dev;
573 sb->s_op = &ext2_sops;
574 if (!(sb->s_mounted = iget (sb, EXT2_ROOT_INO))) {
575 sb->s_dev = 0;
576 for (i = 0; i < db_count; i++)
577 if (sb->u.ext2_sb.s_group_desc[i])
578 brelse (sb->u.ext2_sb.s_group_desc[i]);
579 kfree_s (sb->u.ext2_sb.s_group_desc,
580 db_count * sizeof (struct buffer_head *));
581 brelse (bh);
582 printk ("EXT2-fs: get root inode failed\n");
583 return NULL;
584 }
585 #ifdef EXT2FS_PRE_02B_COMPAT
586 if (fs_converted) {
587 for (i = 0; i < db_count; i++)
588 mark_buffer_dirty(sb->u.ext2_sb.s_group_desc[i], 1);
589 sb->s_dirt = 1;
590 }
591 #endif
592 ext2_setup_super (sb, es);
593 return sb;
594 }
595
596 static void ext2_commit_super (struct super_block * sb,
597 struct ext2_super_block * es)
598 {
599 es->s_wtime = CURRENT_TIME;
600 mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
601 sb->s_dirt = 0;
602 }
603
604
605
606
607
608
609
610
611
612
613
614
615 void ext2_write_super (struct super_block * sb)
616 {
617 struct ext2_super_block * es;
618
619 if (!(sb->s_flags & MS_RDONLY)) {
620 es = sb->u.ext2_sb.s_es;
621
622 ext2_debug ("setting valid to 0\n");
623
624 if (es->s_state & EXT2_VALID_FS) {
625 es->s_state &= ~EXT2_VALID_FS;
626 es->s_mtime = CURRENT_TIME;
627 }
628 ext2_commit_super (sb, es);
629 }
630 sb->s_dirt = 0;
631 }
632
633 int ext2_remount (struct super_block * sb, int * flags, char * data)
634 {
635 struct ext2_super_block * es;
636 unsigned long tmp;
637
638
639
640
641 set_opt (sb->u.ext2_sb.s_mount_opt, CHECK_NORMAL);
642 parse_options (data, &tmp, &sb->u.ext2_sb.s_mount_opt);
643
644 es = sb->u.ext2_sb.s_es;
645 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
646 return 0;
647 if (*flags & MS_RDONLY) {
648 if (es->s_state & EXT2_VALID_FS ||
649 !(sb->u.ext2_sb.s_mount_state & EXT2_VALID_FS))
650 return 0;
651
652
653
654
655 es->s_state = sb->u.ext2_sb.s_mount_state;
656 es->s_mtime = CURRENT_TIME;
657 mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
658 sb->s_dirt = 1;
659 ext2_commit_super (sb, es);
660 }
661 else {
662
663
664
665
666
667 sb->u.ext2_sb.s_mount_state = es->s_state;
668 sb->s_flags &= ~MS_RDONLY;
669 ext2_setup_super (sb, es);
670 }
671 return 0;
672 }
673
674 void ext2_statfs (struct super_block * sb, struct statfs * buf)
675 {
676 long tmp;
677 unsigned long overhead;
678 unsigned long overhead_per_group;
679
680 if (test_opt (sb, MINIX_DF))
681 overhead = 0;
682 else {
683
684
685
686 overhead_per_group = 1 +
687 sb->u.ext2_sb.s_db_per_group +
688 1 +
689 1 +
690 sb->u.ext2_sb.s_itb_per_group ;
691 overhead = sb->u.ext2_sb.s_es->s_first_data_block +
692 sb->u.ext2_sb.s_groups_count * overhead_per_group;
693 }
694
695 put_fs_long (EXT2_SUPER_MAGIC, &buf->f_type);
696 put_fs_long (sb->s_blocksize, &buf->f_bsize);
697 put_fs_long (sb->u.ext2_sb.s_es->s_blocks_count - overhead,
698 &buf->f_blocks);
699 tmp = ext2_count_free_blocks (sb);
700 put_fs_long (tmp, &buf->f_bfree);
701 if (tmp >= sb->u.ext2_sb.s_es->s_r_blocks_count)
702 put_fs_long (tmp - sb->u.ext2_sb.s_es->s_r_blocks_count,
703 &buf->f_bavail);
704 else
705 put_fs_long (0, &buf->f_bavail);
706 put_fs_long (sb->u.ext2_sb.s_es->s_inodes_count, &buf->f_files);
707 put_fs_long (ext2_count_free_inodes (sb), &buf->f_ffree);
708 put_fs_long (EXT2_NAME_LEN, &buf->f_namelen);
709
710 }
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