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 (!(sb->s_flags & MS_RDONLY)) {
275 if (!(sb->u.ext2_sb.s_mount_state & EXT2_VALID_FS))
276 printk ("EXT2-fs warning: mounting unchecked fs, "
277 "running e2fsck is recommended\n");
278 else if ((sb->u.ext2_sb.s_mount_state & EXT2_ERROR_FS))
279 printk ("EXT2-fs warning: mounting fs with errors, "
280 "running e2fsck is recommended\n");
281 else if (es->s_max_mnt_count >= 0 &&
282 es->s_mnt_count >= (unsigned short) es->s_max_mnt_count)
283 printk ("EXT2-fs warning: maximal mount count reached, "
284 "running e2fsck is recommended\n");
285 else if (es->s_checkinterval &&
286 (es->s_lastcheck + es->s_checkinterval <= CURRENT_TIME))
287 printk ("EXT2-fs warning: checktime reached, "
288 "running e2fsck is recommended\n");
289 es->s_state &= ~EXT2_VALID_FS;
290 if (!es->s_max_mnt_count)
291 es->s_max_mnt_count = EXT2_DFL_MAX_MNT_COUNT;
292 es->s_mnt_count++;
293 es->s_mtime = CURRENT_TIME;
294 mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
295 sb->s_dirt = 1;
296 if (test_opt (sb, DEBUG))
297 printk ("[EXT II FS %s, %s, bs=%lu, fs=%lu, gc=%lu, "
298 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
299 EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize,
300 sb->u.ext2_sb.s_frag_size,
301 sb->u.ext2_sb.s_groups_count,
302 EXT2_BLOCKS_PER_GROUP(sb),
303 EXT2_INODES_PER_GROUP(sb),
304 sb->u.ext2_sb.s_mount_opt);
305 if (test_opt (sb, CHECK)) {
306 ext2_check_blocks_bitmap (sb);
307 ext2_check_inodes_bitmap (sb);
308 }
309 }
310 }
311
312 static int ext2_check_descriptors (struct super_block * sb)
313 {
314 int i;
315 int desc_block = 0;
316 unsigned long block = sb->u.ext2_sb.s_es->s_first_data_block;
317 struct ext2_group_desc * gdp = NULL;
318
319 ext2_debug ("Checking group descriptors");
320
321 for (i = 0; i < sb->u.ext2_sb.s_groups_count; i++)
322 {
323 if ((i % EXT2_DESC_PER_BLOCK(sb)) == 0)
324 gdp = (struct ext2_group_desc *) sb->u.ext2_sb.s_group_desc[desc_block++]->b_data;
325 if (gdp->bg_block_bitmap < block ||
326 gdp->bg_block_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb))
327 {
328 ext2_error (sb, "ext2_check_descriptors",
329 "Block bitmap for group %d"
330 " not in group (block %lu)!",
331 i, gdp->bg_block_bitmap);
332 return 0;
333 }
334 if (gdp->bg_inode_bitmap < block ||
335 gdp->bg_inode_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb))
336 {
337 ext2_error (sb, "ext2_check_descriptors",
338 "Inode bitmap for group %d"
339 " not in group (block %lu)!",
340 i, gdp->bg_inode_bitmap);
341 return 0;
342 }
343 if (gdp->bg_inode_table < block ||
344 gdp->bg_inode_table + sb->u.ext2_sb.s_itb_per_group >=
345 block + EXT2_BLOCKS_PER_GROUP(sb))
346 {
347 ext2_error (sb, "ext2_check_descriptors",
348 "Inode table for group %d"
349 " not in group (block %lu)!",
350 i, gdp->bg_inode_table);
351 return 0;
352 }
353 block += EXT2_BLOCKS_PER_GROUP(sb);
354 gdp++;
355 }
356 return 1;
357 }
358
359 struct super_block * ext2_read_super (struct super_block * sb, void * data,
360 int silent)
361 {
362 struct buffer_head * bh;
363 struct ext2_super_block * es;
364 unsigned long sb_block = 1;
365 unsigned long logic_sb_block = 1;
366 int dev = sb->s_dev;
367 int db_count;
368 int i, j;
369 #ifdef EXT2FS_PRE_02B_COMPAT
370 int fs_converted = 0;
371 #endif
372
373 set_opt (sb->u.ext2_sb.s_mount_opt, CHECK_NORMAL);
374 if (!parse_options ((char *) data, &sb_block,
375 &sb->u.ext2_sb.s_mount_opt)) {
376 sb->s_dev = 0;
377 return NULL;
378 }
379
380 lock_super (sb);
381 set_blocksize (dev, BLOCK_SIZE);
382 if (!(bh = bread (dev, sb_block, BLOCK_SIZE))) {
383 sb->s_dev = 0;
384 unlock_super (sb);
385 printk ("EXT2-fs: unable to read superblock\n");
386 return NULL;
387 }
388
389
390
391
392 es = (struct ext2_super_block *) bh->b_data;
393 sb->u.ext2_sb.s_es = es;
394 sb->s_magic = es->s_magic;
395 if (sb->s_magic != EXT2_SUPER_MAGIC
396 #ifdef EXT2FS_PRE_02B_COMPAT
397 && sb->s_magic != EXT2_PRE_02B_MAGIC
398 #endif
399 ) {
400 sb->s_dev = 0;
401 unlock_super (sb);
402 brelse (bh);
403 if (!silent)
404 printk ("VFS: Can't find an ext2 filesystem on dev %d/%d.\n",
405 MAJOR(dev), MINOR(dev));
406 return NULL;
407 }
408 sb->s_blocksize = EXT2_MIN_BLOCK_SIZE << es->s_log_block_size;
409 sb->s_blocksize_bits = EXT2_BLOCK_SIZE_BITS(sb);
410 if (sb->s_blocksize != BLOCK_SIZE &&
411 (sb->s_blocksize == 1024 || sb->s_blocksize == 2048 ||
412 sb->s_blocksize == 4096)) {
413 unsigned long offset;
414
415 brelse (bh);
416 set_blocksize (dev, sb->s_blocksize);
417 logic_sb_block = (sb_block*BLOCK_SIZE) / sb->s_blocksize;
418 offset = (sb_block*BLOCK_SIZE) % sb->s_blocksize;
419 bh = bread (dev, logic_sb_block, sb->s_blocksize);
420 if(!bh)
421 return NULL;
422 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
423 sb->u.ext2_sb.s_es = es;
424 if (es->s_magic != EXT2_SUPER_MAGIC) {
425 sb->s_dev = 0;
426 unlock_super (sb);
427 brelse (bh);
428 printk ("EXT2-fs: Magic mismatch, very weird !\n");
429 return NULL;
430 }
431 }
432 sb->u.ext2_sb.s_frag_size = EXT2_MIN_FRAG_SIZE <<
433 es->s_log_frag_size;
434 if (sb->u.ext2_sb.s_frag_size)
435 sb->u.ext2_sb.s_frags_per_block = sb->s_blocksize /
436 sb->u.ext2_sb.s_frag_size;
437 else
438 sb->s_magic = 0;
439 sb->u.ext2_sb.s_blocks_per_group = es->s_blocks_per_group;
440 sb->u.ext2_sb.s_frags_per_group = es->s_frags_per_group;
441 sb->u.ext2_sb.s_inodes_per_group = es->s_inodes_per_group;
442 sb->u.ext2_sb.s_inodes_per_block = sb->s_blocksize /
443 sizeof (struct ext2_inode);
444 sb->u.ext2_sb.s_itb_per_group = sb->u.ext2_sb.s_inodes_per_group /
445 sb->u.ext2_sb.s_inodes_per_block;
446 sb->u.ext2_sb.s_desc_per_block = sb->s_blocksize /
447 sizeof (struct ext2_group_desc);
448 sb->u.ext2_sb.s_sbh = bh;
449 sb->u.ext2_sb.s_es = es;
450 sb->u.ext2_sb.s_mount_state = es->s_state;
451 sb->u.ext2_sb.s_rename_lock = 0;
452 sb->u.ext2_sb.s_rename_wait = NULL;
453 #ifdef EXT2FS_PRE_02B_COMPAT
454 if (sb->s_magic == EXT2_PRE_02B_MAGIC) {
455 if (es->s_blocks_count > 262144) {
456
457
458
459 sb->s_dev = 0;
460 unlock_super (sb);
461 brelse (bh);
462 printk ("EXT2-fs: trying to mount a pre-0.2b file"
463 "system which cannot be converted\n");
464 return NULL;
465 }
466 printk ("EXT2-fs: mounting a pre 0.2b file system, "
467 "will try to convert the structure\n");
468 if (!(sb->s_flags & MS_RDONLY)) {
469 sb->s_dev = 0;
470 unlock_super (sb);
471 brelse (bh);
472 printk ("EXT2-fs: cannot convert a read-only fs\n");
473 return NULL;
474 }
475 if (!convert_pre_02b_fs (sb, bh)) {
476 sb->s_dev = 0;
477 unlock_super (sb);
478 brelse (bh);
479 printk ("EXT2-fs: conversion failed !!!\n");
480 return NULL;
481 }
482 printk ("EXT2-fs: conversion succeeded !!!\n");
483 fs_converted = 1;
484 }
485 #endif
486 if (sb->s_magic != EXT2_SUPER_MAGIC) {
487 sb->s_dev = 0;
488 unlock_super (sb);
489 brelse (bh);
490 if (!silent)
491 printk ("VFS: Can't find an ext2 filesystem on dev %d/%d.\n",
492 MAJOR(dev), MINOR(dev));
493 return NULL;
494 }
495 if (sb->s_blocksize != bh->b_size) {
496 sb->s_dev = 0;
497 unlock_super (sb);
498 brelse (bh);
499 if (!silent)
500 printk ("VFS: Unsupported blocksize on dev 0x%04x.\n",
501 dev);
502 return NULL;
503 }
504
505 if (sb->s_blocksize != sb->u.ext2_sb.s_frag_size) {
506 sb->s_dev = 0;
507 unlock_super (sb);
508 brelse (bh);
509 printk ("EXT2-fs: fragsize %lu != blocksize %lu (not supported yet)\n",
510 sb->u.ext2_sb.s_frag_size, sb->s_blocksize);
511 return NULL;
512 }
513
514 sb->u.ext2_sb.s_groups_count = (es->s_blocks_count -
515 es->s_first_data_block +
516 EXT2_BLOCKS_PER_GROUP(sb) - 1) /
517 EXT2_BLOCKS_PER_GROUP(sb);
518 db_count = (sb->u.ext2_sb.s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) /
519 EXT2_DESC_PER_BLOCK(sb);
520 sb->u.ext2_sb.s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL);
521 if (sb->u.ext2_sb.s_group_desc == NULL) {
522 sb->s_dev = 0;
523 unlock_super (sb);
524 brelse (bh);
525 printk ("EXT2-fs: not enough memory\n");
526 return NULL;
527 }
528 for (i = 0; i < db_count; i++) {
529 sb->u.ext2_sb.s_group_desc[i] = bread (dev, logic_sb_block + i + 1,
530 sb->s_blocksize);
531 if (!sb->u.ext2_sb.s_group_desc[i]) {
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[j]);
536 kfree_s (sb->u.ext2_sb.s_group_desc,
537 db_count * sizeof (struct buffer_head *));
538 brelse (bh);
539 printk ("EXT2-fs: unable to read group descriptors\n");
540 return NULL;
541 }
542 }
543 if (!ext2_check_descriptors (sb)) {
544 sb->s_dev = 0;
545 unlock_super (sb);
546 for (j = 0; j < db_count; j++)
547 brelse (sb->u.ext2_sb.s_group_desc[j]);
548 kfree_s (sb->u.ext2_sb.s_group_desc,
549 db_count * sizeof (struct buffer_head *));
550 brelse (bh);
551 printk ("EXT2-fs: group descriptors corrupted !\n");
552 return NULL;
553 }
554 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++) {
555 sb->u.ext2_sb.s_inode_bitmap_number[i] = 0;
556 sb->u.ext2_sb.s_inode_bitmap[i] = NULL;
557 sb->u.ext2_sb.s_block_bitmap_number[i] = 0;
558 sb->u.ext2_sb.s_block_bitmap[i] = NULL;
559 }
560 sb->u.ext2_sb.s_loaded_inode_bitmaps = 0;
561 sb->u.ext2_sb.s_loaded_block_bitmaps = 0;
562 sb->u.ext2_sb.s_db_per_group = db_count;
563 unlock_super (sb);
564
565
566
567 sb->s_dev = dev;
568 sb->s_op = &ext2_sops;
569 if (!(sb->s_mounted = iget (sb, EXT2_ROOT_INO))) {
570 sb->s_dev = 0;
571 for (i = 0; i < db_count; i++)
572 if (sb->u.ext2_sb.s_group_desc[i])
573 brelse (sb->u.ext2_sb.s_group_desc[i]);
574 kfree_s (sb->u.ext2_sb.s_group_desc,
575 db_count * sizeof (struct buffer_head *));
576 brelse (bh);
577 printk ("EXT2-fs: get root inode failed\n");
578 return NULL;
579 }
580 #ifdef EXT2FS_PRE_02B_COMPAT
581 if (fs_converted) {
582 for (i = 0; i < db_count; i++)
583 mark_buffer_dirty(sb->u.ext2_sb.s_group_desc[i], 1);
584 sb->s_dirt = 1;
585 }
586 #endif
587 ext2_setup_super (sb, es);
588 return sb;
589 }
590
591 static void ext2_commit_super (struct super_block * sb,
592 struct ext2_super_block * es)
593 {
594 es->s_wtime = CURRENT_TIME;
595 mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
596 sb->s_dirt = 0;
597 }
598
599
600
601
602
603
604
605
606
607
608
609
610 void ext2_write_super (struct super_block * sb)
611 {
612 struct ext2_super_block * es;
613
614 if (!(sb->s_flags & MS_RDONLY)) {
615 es = sb->u.ext2_sb.s_es;
616
617 ext2_debug ("setting valid to 0\n");
618
619 if (es->s_state & EXT2_VALID_FS) {
620 es->s_state &= ~EXT2_VALID_FS;
621 es->s_mtime = CURRENT_TIME;
622 }
623 ext2_commit_super (sb, es);
624 }
625 sb->s_dirt = 0;
626 }
627
628 int ext2_remount (struct super_block * sb, int * flags, char * data)
629 {
630 struct ext2_super_block * es;
631 unsigned long tmp;
632
633
634
635
636 set_opt (sb->u.ext2_sb.s_mount_opt, CHECK_NORMAL);
637 parse_options (data, &tmp, &sb->u.ext2_sb.s_mount_opt);
638
639 es = sb->u.ext2_sb.s_es;
640 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
641 return 0;
642 if (*flags & MS_RDONLY) {
643 if (es->s_state & EXT2_VALID_FS ||
644 !(sb->u.ext2_sb.s_mount_state & EXT2_VALID_FS))
645 return 0;
646
647
648
649
650 es->s_state = sb->u.ext2_sb.s_mount_state;
651 es->s_mtime = CURRENT_TIME;
652 mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
653 sb->s_dirt = 1;
654 ext2_commit_super (sb, es);
655 }
656 else {
657
658
659
660
661
662 sb->u.ext2_sb.s_mount_state = es->s_state;
663 sb->s_flags &= ~MS_RDONLY;
664 ext2_setup_super (sb, es);
665 }
666 return 0;
667 }
668
669 void ext2_statfs (struct super_block * sb, struct statfs * buf)
670 {
671 long tmp;
672 unsigned long overhead;
673 unsigned long overhead_per_group;
674
675 if (test_opt (sb, MINIX_DF))
676 overhead = 0;
677 else {
678
679
680
681 overhead_per_group = 1 +
682 sb->u.ext2_sb.s_db_per_group +
683 1 +
684 1 +
685 sb->u.ext2_sb.s_itb_per_group ;
686 overhead = sb->u.ext2_sb.s_es->s_first_data_block +
687 sb->u.ext2_sb.s_groups_count * overhead_per_group;
688 }
689
690 put_fs_long (EXT2_SUPER_MAGIC, &buf->f_type);
691 put_fs_long (sb->s_blocksize, &buf->f_bsize);
692 put_fs_long (sb->u.ext2_sb.s_es->s_blocks_count - overhead,
693 &buf->f_blocks);
694 tmp = ext2_count_free_blocks (sb);
695 put_fs_long (tmp, &buf->f_bfree);
696 if (tmp >= sb->u.ext2_sb.s_es->s_r_blocks_count)
697 put_fs_long (tmp - sb->u.ext2_sb.s_es->s_r_blocks_count,
698 &buf->f_bavail);
699 else
700 put_fs_long (0, &buf->f_bavail);
701 put_fs_long (sb->u.ext2_sb.s_es->s_inodes_count, &buf->f_files);
702 put_fs_long (ext2_count_free_inodes (sb), &buf->f_ffree);
703 put_fs_long (EXT2_NAME_LEN, &buf->f_namelen);
704
705 }
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