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1 /*
2 * linux/fs/ext2/super.c
3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/fs/minix/inode.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
17 */
18
19 #include <linux/config.h>
20 #include <linux/module.h>
21 #include <linux/string.h>
22 #include <linux/fs.h>
23 #include <linux/slab.h>
24 #include <linux/init.h>
25 #include <linux/blkdev.h>
26 #include <linux/parser.h>
27 #include <linux/random.h>
28 #include <linux/buffer_head.h>
29 #include <linux/smp_lock.h>
30 #include <linux/vfs.h>
31 #include <linux/seq_file.h>
32 #include <linux/mount.h>
33 #include <asm/uaccess.h>
34 #include "ext2.h"
35 #include "xattr.h"
36 #include "acl.h"
37 #include "xip.h"
38
39 static void ext2_sync_super(struct super_block *sb,
40 struct ext2_super_block *es);
41 static int ext2_remount (struct super_block * sb, int * flags, char * data);
42 static int ext2_statfs (struct super_block * sb, struct kstatfs * buf);
43
44 void ext2_error (struct super_block * sb, const char * function,
45 const char * fmt, ...)
46 {
47 va_list args;
48 struct ext2_sb_info *sbi = EXT2_SB(sb);
49 struct ext2_super_block *es = sbi->s_es;
50
51 if (!(sb->s_flags & MS_RDONLY)) {
52 sbi->s_mount_state |= EXT2_ERROR_FS;
53 es->s_state =
54 cpu_to_le16(le16_to_cpu(es->s_state) | EXT2_ERROR_FS);
55 ext2_sync_super(sb, es);
56 }
57
58 va_start(args, fmt);
59 printk(KERN_CRIT "EXT2-fs error (device %s): %s: ",sb->s_id, function);
60 vprintk(fmt, args);
61 printk("\n");
62 va_end(args);
63
64 if (test_opt(sb, ERRORS_PANIC))
65 panic("EXT2-fs panic from previous error\n");
66 if (test_opt(sb, ERRORS_RO)) {
67 printk("Remounting filesystem read-only\n");
68 sb->s_flags |= MS_RDONLY;
69 }
70 }
71
72 void ext2_warning (struct super_block * sb, const char * function,
73 const char * fmt, ...)
74 {
75 va_list args;
76
77 va_start(args, fmt);
78 printk(KERN_WARNING "EXT2-fs warning (device %s): %s: ",
79 sb->s_id, function);
80 vprintk(fmt, args);
81 printk("\n");
82 va_end(args);
83 }
84
85 void ext2_update_dynamic_rev(struct super_block *sb)
86 {
87 struct ext2_super_block *es = EXT2_SB(sb)->s_es;
88
89 if (le32_to_cpu(es->s_rev_level) > EXT2_GOOD_OLD_REV)
90 return;
91
92 ext2_warning(sb, __FUNCTION__,
93 "updating to rev %d because of new feature flag, "
94 "running e2fsck is recommended",
95 EXT2_DYNAMIC_REV);
96
97 es->s_first_ino = cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO);
98 es->s_inode_size = cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE);
99 es->s_rev_level = cpu_to_le32(EXT2_DYNAMIC_REV);
100 /* leave es->s_feature_*compat flags alone */
101 /* es->s_uuid will be set by e2fsck if empty */
102
103 /*
104 * The rest of the superblock fields should be zero, and if not it
105 * means they are likely already in use, so leave them alone. We
106 * can leave it up to e2fsck to clean up any inconsistencies there.
107 */
108 }
109
110 static void ext2_put_super (struct super_block * sb)
111 {
112 int db_count;
113 int i;
114 struct ext2_sb_info *sbi = EXT2_SB(sb);
115
116 ext2_xattr_put_super(sb);
117 if (!(sb->s_flags & MS_RDONLY)) {
118 struct ext2_super_block *es = sbi->s_es;
119
120 es->s_state = cpu_to_le16(sbi->s_mount_state);
121 ext2_sync_super(sb, es);
122 }
123 db_count = sbi->s_gdb_count;
124 for (i = 0; i < db_count; i++)
125 if (sbi->s_group_desc[i])
126 brelse (sbi->s_group_desc[i]);
127 kfree(sbi->s_group_desc);
128 kfree(sbi->s_debts);
129 percpu_counter_destroy(&sbi->s_freeblocks_counter);
130 percpu_counter_destroy(&sbi->s_freeinodes_counter);
131 percpu_counter_destroy(&sbi->s_dirs_counter);
132 brelse (sbi->s_sbh);
133 sb->s_fs_info = NULL;
134 kfree(sbi);
135
136 return;
137 }
138
139 static kmem_cache_t * ext2_inode_cachep;
140
141 static struct inode *ext2_alloc_inode(struct super_block *sb)
142 {
143 struct ext2_inode_info *ei;
144 ei = (struct ext2_inode_info *)kmem_cache_alloc(ext2_inode_cachep, SLAB_KERNEL);
145 if (!ei)
146 return NULL;
147 #ifdef CONFIG_EXT2_FS_POSIX_ACL
148 ei->i_acl = EXT2_ACL_NOT_CACHED;
149 ei->i_default_acl = EXT2_ACL_NOT_CACHED;
150 #endif
151 ei->vfs_inode.i_version = 1;
152 return &ei->vfs_inode;
153 }
154
155 static void ext2_destroy_inode(struct inode *inode)
156 {
157 kmem_cache_free(ext2_inode_cachep, EXT2_I(inode));
158 }
159
160 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
161 {
162 struct ext2_inode_info *ei = (struct ext2_inode_info *) foo;
163
164 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
165 SLAB_CTOR_CONSTRUCTOR) {
166 rwlock_init(&ei->i_meta_lock);
167 #ifdef CONFIG_EXT2_FS_XATTR
168 init_rwsem(&ei->xattr_sem);
169 #endif
170 inode_init_once(&ei->vfs_inode);
171 }
172 }
173
174 static int init_inodecache(void)
175 {
176 ext2_inode_cachep = kmem_cache_create("ext2_inode_cache",
177 sizeof(struct ext2_inode_info),
178 0, SLAB_RECLAIM_ACCOUNT,
179 init_once, NULL);
180 if (ext2_inode_cachep == NULL)
181 return -ENOMEM;
182 return 0;
183 }
184
185 static void destroy_inodecache(void)
186 {
187 if (kmem_cache_destroy(ext2_inode_cachep))
188 printk(KERN_INFO "ext2_inode_cache: not all structures were freed\n");
189 }
190
191 static void ext2_clear_inode(struct inode *inode)
192 {
193 #ifdef CONFIG_EXT2_FS_POSIX_ACL
194 struct ext2_inode_info *ei = EXT2_I(inode);
195
196 if (ei->i_acl && ei->i_acl != EXT2_ACL_NOT_CACHED) {
197 posix_acl_release(ei->i_acl);
198 ei->i_acl = EXT2_ACL_NOT_CACHED;
199 }
200 if (ei->i_default_acl && ei->i_default_acl != EXT2_ACL_NOT_CACHED) {
201 posix_acl_release(ei->i_default_acl);
202 ei->i_default_acl = EXT2_ACL_NOT_CACHED;
203 }
204 #endif
205 }
206
207 static int ext2_show_options(struct seq_file *seq, struct vfsmount *vfs)
208 {
209 struct ext2_sb_info *sbi = EXT2_SB(vfs->mnt_sb);
210
211 if (sbi->s_mount_opt & EXT2_MOUNT_GRPID)
212 seq_puts(seq, ",grpid");
213 else
214 seq_puts(seq, ",nogrpid");
215
216 #if defined(CONFIG_QUOTA)
217 if (sbi->s_mount_opt & EXT2_MOUNT_USRQUOTA)
218 seq_puts(seq, ",usrquota");
219
220 if (sbi->s_mount_opt & EXT2_MOUNT_GRPQUOTA)
221 seq_puts(seq, ",grpquota");
222 #endif
223
224 return 0;
225 }
226
227 #ifdef CONFIG_QUOTA
228 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off);
229 static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off);
230 #endif
231
232 static struct super_operations ext2_sops = {
233 .alloc_inode = ext2_alloc_inode,
234 .destroy_inode = ext2_destroy_inode,
235 .read_inode = ext2_read_inode,
236 .write_inode = ext2_write_inode,
237 .put_inode = ext2_put_inode,
238 .delete_inode = ext2_delete_inode,
239 .put_super = ext2_put_super,
240 .write_super = ext2_write_super,
241 .statfs = ext2_statfs,
242 .remount_fs = ext2_remount,
243 .clear_inode = ext2_clear_inode,
244 .show_options = ext2_show_options,
245 #ifdef CONFIG_QUOTA
246 .quota_read = ext2_quota_read,
247 .quota_write = ext2_quota_write,
248 #endif
249 };
250
251 /* Yes, most of these are left as NULL!!
252 * A NULL value implies the default, which works with ext2-like file
253 * systems, but can be improved upon.
254 * Currently only get_parent is required.
255 */
256 struct dentry *ext2_get_parent(struct dentry *child);
257 static struct export_operations ext2_export_ops = {
258 .get_parent = ext2_get_parent,
259 };
260
261 static unsigned long get_sb_block(void **data)
262 {
263 unsigned long sb_block;
264 char *options = (char *) *data;
265
266 if (!options || strncmp(options, "sb=", 3) != 0)
267 return 1; /* Default location */
268 options += 3;
269 sb_block = simple_strtoul(options, &options, 0);
270 if (*options && *options != ',') {
271 printk("EXT2-fs: Invalid sb specification: %s\n",
272 (char *) *data);
273 return 1;
274 }
275 if (*options == ',')
276 options++;
277 *data = (void *) options;
278 return sb_block;
279 }
280
281 enum {
282 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
283 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic,
284 Opt_err_ro, Opt_nouid32, Opt_nocheck, Opt_debug,
285 Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr,
286 Opt_acl, Opt_noacl, Opt_xip, Opt_ignore, Opt_err, Opt_quota,
287 Opt_usrquota, Opt_grpquota
288 };
289
290 static match_table_t tokens = {
291 {Opt_bsd_df, "bsddf"},
292 {Opt_minix_df, "minixdf"},
293 {Opt_grpid, "grpid"},
294 {Opt_grpid, "bsdgroups"},
295 {Opt_nogrpid, "nogrpid"},
296 {Opt_nogrpid, "sysvgroups"},
297 {Opt_resgid, "resgid=%u"},
298 {Opt_resuid, "resuid=%u"},
299 {Opt_sb, "sb=%u"},
300 {Opt_err_cont, "errors=continue"},
301 {Opt_err_panic, "errors=panic"},
302 {Opt_err_ro, "errors=remount-ro"},
303 {Opt_nouid32, "nouid32"},
304 {Opt_nocheck, "check=none"},
305 {Opt_nocheck, "nocheck"},
306 {Opt_debug, "debug"},
307 {Opt_oldalloc, "oldalloc"},
308 {Opt_orlov, "orlov"},
309 {Opt_nobh, "nobh"},
310 {Opt_user_xattr, "user_xattr"},
311 {Opt_nouser_xattr, "nouser_xattr"},
312 {Opt_acl, "acl"},
313 {Opt_noacl, "noacl"},
314 {Opt_xip, "xip"},
315 {Opt_grpquota, "grpquota"},
316 {Opt_ignore, "noquota"},
317 {Opt_quota, "quota"},
318 {Opt_usrquota, "usrquota"},
319 {Opt_err, NULL}
320 };
321
322 static int parse_options (char * options,
323 struct ext2_sb_info *sbi)
324 {
325 char * p;
326 substring_t args[MAX_OPT_ARGS];
327 unsigned long kind = EXT2_MOUNT_ERRORS_CONT;
328 int option;
329
330 if (!options)
331 return 1;
332
333 while ((p = strsep (&options, ",")) != NULL) {
334 int token;
335 if (!*p)
336 continue;
337
338 token = match_token(p, tokens, args);
339 switch (token) {
340 case Opt_bsd_df:
341 clear_opt (sbi->s_mount_opt, MINIX_DF);
342 break;
343 case Opt_minix_df:
344 set_opt (sbi->s_mount_opt, MINIX_DF);
345 break;
346 case Opt_grpid:
347 set_opt (sbi->s_mount_opt, GRPID);
348 break;
349 case Opt_nogrpid:
350 clear_opt (sbi->s_mount_opt, GRPID);
351 break;
352 case Opt_resuid:
353 if (match_int(&args[0], &option))
354 return 0;
355 sbi->s_resuid = option;
356 break;
357 case Opt_resgid:
358 if (match_int(&args[0], &option))
359 return 0;
360 sbi->s_resgid = option;
361 break;
362 case Opt_sb:
363 /* handled by get_sb_block() instead of here */
364 /* *sb_block = match_int(&args[0]); */
365 break;
366 case Opt_err_panic:
367 kind = EXT2_MOUNT_ERRORS_PANIC;
368 break;
369 case Opt_err_ro:
370 kind = EXT2_MOUNT_ERRORS_RO;
371 break;
372 case Opt_err_cont:
373 kind = EXT2_MOUNT_ERRORS_CONT;
374 break;
375 case Opt_nouid32:
376 set_opt (sbi->s_mount_opt, NO_UID32);
377 break;
378 case Opt_nocheck:
379 clear_opt (sbi->s_mount_opt, CHECK);
380 break;
381 case Opt_debug:
382 set_opt (sbi->s_mount_opt, DEBUG);
383 break;
384 case Opt_oldalloc:
385 set_opt (sbi->s_mount_opt, OLDALLOC);
386 break;
387 case Opt_orlov:
388 clear_opt (sbi->s_mount_opt, OLDALLOC);
389 break;
390 case Opt_nobh:
391 set_opt (sbi->s_mount_opt, NOBH);
392 break;
393 #ifdef CONFIG_EXT2_FS_XATTR
394 case Opt_user_xattr:
395 set_opt (sbi->s_mount_opt, XATTR_USER);
396 break;
397 case Opt_nouser_xattr:
398 clear_opt (sbi->s_mount_opt, XATTR_USER);
399 break;
400 #else
401 case Opt_user_xattr:
402 case Opt_nouser_xattr:
403 printk("EXT2 (no)user_xattr options not supported\n");
404 break;
405 #endif
406 #ifdef CONFIG_EXT2_FS_POSIX_ACL
407 case Opt_acl:
408 set_opt(sbi->s_mount_opt, POSIX_ACL);
409 break;
410 case Opt_noacl:
411 clear_opt(sbi->s_mount_opt, POSIX_ACL);
412 break;
413 #else
414 case Opt_acl:
415 case Opt_noacl:
416 printk("EXT2 (no)acl options not supported\n");
417 break;
418 #endif
419 case Opt_xip:
420 #ifdef CONFIG_EXT2_FS_XIP
421 set_opt (sbi->s_mount_opt, XIP);
422 #else
423 printk("EXT2 xip option not supported\n");
424 #endif
425 break;
426
427 #if defined(CONFIG_QUOTA)
428 case Opt_quota:
429 case Opt_usrquota:
430 set_opt(sbi->s_mount_opt, USRQUOTA);
431 break;
432
433 case Opt_grpquota:
434 set_opt(sbi->s_mount_opt, GRPQUOTA);
435 break;
436 #else
437 case Opt_quota:
438 case Opt_usrquota:
439 case Opt_grpquota:
440 printk(KERN_ERR
441 "EXT2-fs: quota operations not supported.\n");
442
443 break;
444 #endif
445
446 case Opt_ignore:
447 break;
448 default:
449 return 0;
450 }
451 }
452 sbi->s_mount_opt |= kind;
453 return 1;
454 }
455
456 static int ext2_setup_super (struct super_block * sb,
457 struct ext2_super_block * es,
458 int read_only)
459 {
460 int res = 0;
461 struct ext2_sb_info *sbi = EXT2_SB(sb);
462
463 if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) {
464 printk ("EXT2-fs warning: revision level too high, "
465 "forcing read-only mode\n");
466 res = MS_RDONLY;
467 }
468 if (read_only)
469 return res;
470 if (!(sbi->s_mount_state & EXT2_VALID_FS))
471 printk ("EXT2-fs warning: mounting unchecked fs, "
472 "running e2fsck is recommended\n");
473 else if ((sbi->s_mount_state & EXT2_ERROR_FS))
474 printk ("EXT2-fs warning: mounting fs with errors, "
475 "running e2fsck is recommended\n");
476 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
477 le16_to_cpu(es->s_mnt_count) >=
478 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
479 printk ("EXT2-fs warning: maximal mount count reached, "
480 "running e2fsck is recommended\n");
481 else if (le32_to_cpu(es->s_checkinterval) &&
482 (le32_to_cpu(es->s_lastcheck) + le32_to_cpu(es->s_checkinterval) <= get_seconds()))
483 printk ("EXT2-fs warning: checktime reached, "
484 "running e2fsck is recommended\n");
485 if (!le16_to_cpu(es->s_max_mnt_count))
486 es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT);
487 es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
488 ext2_write_super(sb);
489 if (test_opt (sb, DEBUG))
490 printk ("[EXT II FS %s, %s, bs=%lu, fs=%lu, gc=%lu, "
491 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
492 EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize,
493 sbi->s_frag_size,
494 sbi->s_groups_count,
495 EXT2_BLOCKS_PER_GROUP(sb),
496 EXT2_INODES_PER_GROUP(sb),
497 sbi->s_mount_opt);
498 return res;
499 }
500
501 static int ext2_check_descriptors (struct super_block * sb)
502 {
503 int i;
504 int desc_block = 0;
505 struct ext2_sb_info *sbi = EXT2_SB(sb);
506 unsigned long block = le32_to_cpu(sbi->s_es->s_first_data_block);
507 struct ext2_group_desc * gdp = NULL;
508
509 ext2_debug ("Checking group descriptors");
510
511 for (i = 0; i < sbi->s_groups_count; i++)
512 {
513 if ((i % EXT2_DESC_PER_BLOCK(sb)) == 0)
514 gdp = (struct ext2_group_desc *) sbi->s_group_desc[desc_block++]->b_data;
515 if (le32_to_cpu(gdp->bg_block_bitmap) < block ||
516 le32_to_cpu(gdp->bg_block_bitmap) >= block + EXT2_BLOCKS_PER_GROUP(sb))
517 {
518 ext2_error (sb, "ext2_check_descriptors",
519 "Block bitmap for group %d"
520 " not in group (block %lu)!",
521 i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap));
522 return 0;
523 }
524 if (le32_to_cpu(gdp->bg_inode_bitmap) < block ||
525 le32_to_cpu(gdp->bg_inode_bitmap) >= block + EXT2_BLOCKS_PER_GROUP(sb))
526 {
527 ext2_error (sb, "ext2_check_descriptors",
528 "Inode bitmap for group %d"
529 " not in group (block %lu)!",
530 i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap));
531 return 0;
532 }
533 if (le32_to_cpu(gdp->bg_inode_table) < block ||
534 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group >=
535 block + EXT2_BLOCKS_PER_GROUP(sb))
536 {
537 ext2_error (sb, "ext2_check_descriptors",
538 "Inode table for group %d"
539 " not in group (block %lu)!",
540 i, (unsigned long) le32_to_cpu(gdp->bg_inode_table));
541 return 0;
542 }
543 block += EXT2_BLOCKS_PER_GROUP(sb);
544 gdp++;
545 }
546 return 1;
547 }
548
549 #define log2(n) ffz(~(n))
550
551 /*
552 * Maximal file size. There is a direct, and {,double-,triple-}indirect
553 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
554 * We need to be 1 filesystem block less than the 2^32 sector limit.
555 */
556 static loff_t ext2_max_size(int bits)
557 {
558 loff_t res = EXT2_NDIR_BLOCKS;
559 /* This constant is calculated to be the largest file size for a
560 * dense, 4k-blocksize file such that the total number of
561 * sectors in the file, including data and all indirect blocks,
562 * does not exceed 2^32. */
563 const loff_t upper_limit = 0x1ff7fffd000LL;
564
565 res += 1LL << (bits-2);
566 res += 1LL << (2*(bits-2));
567 res += 1LL << (3*(bits-2));
568 res <<= bits;
569 if (res > upper_limit)
570 res = upper_limit;
571 return res;
572 }
573
574 static unsigned long descriptor_loc(struct super_block *sb,
575 unsigned long logic_sb_block,
576 int nr)
577 {
578 struct ext2_sb_info *sbi = EXT2_SB(sb);
579 unsigned long bg, first_data_block, first_meta_bg;
580 int has_super = 0;
581
582 first_data_block = le32_to_cpu(sbi->s_es->s_first_data_block);
583 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
584
585 if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) ||
586 nr < first_meta_bg)
587 return (logic_sb_block + nr + 1);
588 bg = sbi->s_desc_per_block * nr;
589 if (ext2_bg_has_super(sb, bg))
590 has_super = 1;
591 return (first_data_block + has_super + (bg * sbi->s_blocks_per_group));
592 }
593
594 static int ext2_fill_super(struct super_block *sb, void *data, int silent)
595 {
596 struct buffer_head * bh;
597 struct ext2_sb_info * sbi;
598 struct ext2_super_block * es;
599 struct inode *root;
600 unsigned long block;
601 unsigned long sb_block = get_sb_block(&data);
602 unsigned long logic_sb_block;
603 unsigned long offset = 0;
604 unsigned long def_mount_opts;
605 int blocksize = BLOCK_SIZE;
606 int db_count;
607 int i, j;
608 __le32 features;
609
610 sbi = kmalloc(sizeof(*sbi), GFP_KERNEL);
611 if (!sbi)
612 return -ENOMEM;
613 sb->s_fs_info = sbi;
614 memset(sbi, 0, sizeof(*sbi));
615
616 /*
617 * See what the current blocksize for the device is, and
618 * use that as the blocksize. Otherwise (or if the blocksize
619 * is smaller than the default) use the default.
620 * This is important for devices that have a hardware
621 * sectorsize that is larger than the default.
622 */
623 blocksize = sb_min_blocksize(sb, BLOCK_SIZE);
624 if (!blocksize) {
625 printk ("EXT2-fs: unable to set blocksize\n");
626 goto failed_sbi;
627 }
628
629 /*
630 * If the superblock doesn't start on a hardware sector boundary,
631 * calculate the offset.
632 */
633 if (blocksize != BLOCK_SIZE) {
634 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
635 offset = (sb_block*BLOCK_SIZE) % blocksize;
636 } else {
637 logic_sb_block = sb_block;
638 }
639
640 if (!(bh = sb_bread(sb, logic_sb_block))) {
641 printk ("EXT2-fs: unable to read superblock\n");
642 goto failed_sbi;
643 }
644 /*
645 * Note: s_es must be initialized as soon as possible because
646 * some ext2 macro-instructions depend on its value
647 */
648 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
649 sbi->s_es = es;
650 sb->s_magic = le16_to_cpu(es->s_magic);
651
652 if (sb->s_magic != EXT2_SUPER_MAGIC)
653 goto cantfind_ext2;
654
655 /* Set defaults before we parse the mount options */
656 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
657 if (def_mount_opts & EXT2_DEFM_DEBUG)
658 set_opt(sbi->s_mount_opt, DEBUG);
659 if (def_mount_opts & EXT2_DEFM_BSDGROUPS)
660 set_opt(sbi->s_mount_opt, GRPID);
661 if (def_mount_opts & EXT2_DEFM_UID16)
662 set_opt(sbi->s_mount_opt, NO_UID32);
663 if (def_mount_opts & EXT2_DEFM_XATTR_USER)
664 set_opt(sbi->s_mount_opt, XATTR_USER);
665 if (def_mount_opts & EXT2_DEFM_ACL)
666 set_opt(sbi->s_mount_opt, POSIX_ACL);
667
668 if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC)
669 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
670 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_RO)
671 set_opt(sbi->s_mount_opt, ERRORS_RO);
672
673 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
674 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
675
676 if (!parse_options ((char *) data, sbi))
677 goto failed_mount;
678
679 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
680 ((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ?
681 MS_POSIXACL : 0);
682
683 ext2_xip_verify_sb(sb); /* see if bdev supports xip, unset
684 EXT2_MOUNT_XIP if not */
685
686 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV &&
687 (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) ||
688 EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
689 EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U)))
690 printk("EXT2-fs warning: feature flags set on rev 0 fs, "
691 "running e2fsck is recommended\n");
692 /*
693 * Check feature flags regardless of the revision level, since we
694 * previously didn't change the revision level when setting the flags,
695 * so there is a chance incompat flags are set on a rev 0 filesystem.
696 */
697 features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP);
698 if (features) {
699 printk("EXT2-fs: %s: couldn't mount because of "
700 "unsupported optional features (%x).\n",
701 sb->s_id, le32_to_cpu(features));
702 goto failed_mount;
703 }
704 if (!(sb->s_flags & MS_RDONLY) &&
705 (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){
706 printk("EXT2-fs: %s: couldn't mount RDWR because of "
707 "unsupported optional features (%x).\n",
708 sb->s_id, le32_to_cpu(features));
709 goto failed_mount;
710 }
711
712 blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
713
714 if ((ext2_use_xip(sb)) && ((blocksize != PAGE_SIZE) ||
715 (sb->s_blocksize != blocksize))) {
716 if (!silent)
717 printk("XIP: Unsupported blocksize\n");
718 goto failed_mount;
719 }
720
721 /* If the blocksize doesn't match, re-read the thing.. */
722 if (sb->s_blocksize != blocksize) {
723 brelse(bh);
724
725 if (!sb_set_blocksize(sb, blocksize)) {
726 printk(KERN_ERR "EXT2-fs: blocksize too small for device.\n");
727 goto failed_sbi;
728 }
729
730 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
731 offset = (sb_block*BLOCK_SIZE) % blocksize;
732 bh = sb_bread(sb, logic_sb_block);
733 if(!bh) {
734 printk("EXT2-fs: Couldn't read superblock on "
735 "2nd try.\n");
736 goto failed_sbi;
737 }
738 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
739 sbi->s_es = es;
740 if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) {
741 printk ("EXT2-fs: Magic mismatch, very weird !\n");
742 goto failed_mount;
743 }
744 }
745
746 sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits);
747
748 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) {
749 sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE;
750 sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO;
751 } else {
752 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
753 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
754 if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) ||
755 (sbi->s_inode_size & (sbi->s_inode_size - 1)) ||
756 (sbi->s_inode_size > blocksize)) {
757 printk ("EXT2-fs: unsupported inode size: %d\n",
758 sbi->s_inode_size);
759 goto failed_mount;
760 }
761 }
762
763 sbi->s_frag_size = EXT2_MIN_FRAG_SIZE <<
764 le32_to_cpu(es->s_log_frag_size);
765 if (sbi->s_frag_size == 0)
766 goto cantfind_ext2;
767 sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size;
768
769 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
770 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
771 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
772
773 if (EXT2_INODE_SIZE(sb) == 0)
774 goto cantfind_ext2;
775 sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb);
776 if (sbi->s_inodes_per_block == 0)
777 goto cantfind_ext2;
778 sbi->s_itb_per_group = sbi->s_inodes_per_group /
779 sbi->s_inodes_per_block;
780 sbi->s_desc_per_block = sb->s_blocksize /
781 sizeof (struct ext2_group_desc);
782 sbi->s_sbh = bh;
783 sbi->s_mount_state = le16_to_cpu(es->s_state);
784 sbi->s_addr_per_block_bits =
785 log2 (EXT2_ADDR_PER_BLOCK(sb));
786 sbi->s_desc_per_block_bits =
787 log2 (EXT2_DESC_PER_BLOCK(sb));
788
789 if (sb->s_magic != EXT2_SUPER_MAGIC)
790 goto cantfind_ext2;
791
792 if (sb->s_blocksize != bh->b_size) {
793 if (!silent)
794 printk ("VFS: Unsupported blocksize on dev "
795 "%s.\n", sb->s_id);
796 goto failed_mount;
797 }
798
799 if (sb->s_blocksize != sbi->s_frag_size) {
800 printk ("EXT2-fs: fragsize %lu != blocksize %lu (not supported yet)\n",
801 sbi->s_frag_size, sb->s_blocksize);
802 goto failed_mount;
803 }
804
805 if (sbi->s_blocks_per_group > sb->s_blocksize * 8) {
806 printk ("EXT2-fs: #blocks per group too big: %lu\n",
807 sbi->s_blocks_per_group);
808 goto failed_mount;
809 }
810 if (sbi->s_frags_per_group > sb->s_blocksize * 8) {
811 printk ("EXT2-fs: #fragments per group too big: %lu\n",
812 sbi->s_frags_per_group);
813 goto failed_mount;
814 }
815 if (sbi->s_inodes_per_group > sb->s_blocksize * 8) {
816 printk ("EXT2-fs: #inodes per group too big: %lu\n",
817 sbi->s_inodes_per_group);
818 goto failed_mount;
819 }
820
821 if (EXT2_BLOCKS_PER_GROUP(sb) == 0)
822 goto cantfind_ext2;
823 sbi->s_groups_count = (le32_to_cpu(es->s_blocks_count) -
824 le32_to_cpu(es->s_first_data_block) +
825 EXT2_BLOCKS_PER_GROUP(sb) - 1) /
826 EXT2_BLOCKS_PER_GROUP(sb);
827 db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) /
828 EXT2_DESC_PER_BLOCK(sb);
829 sbi->s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL);
830 if (sbi->s_group_desc == NULL) {
831 printk ("EXT2-fs: not enough memory\n");
832 goto failed_mount;
833 }
834 percpu_counter_init(&sbi->s_freeblocks_counter);
835 percpu_counter_init(&sbi->s_freeinodes_counter);
836 percpu_counter_init(&sbi->s_dirs_counter);
837 bgl_lock_init(&sbi->s_blockgroup_lock);
838 sbi->s_debts = kmalloc(sbi->s_groups_count * sizeof(*sbi->s_debts),
839 GFP_KERNEL);
840 if (!sbi->s_debts) {
841 printk ("EXT2-fs: not enough memory\n");
842 goto failed_mount_group_desc;
843 }
844 memset(sbi->s_debts, 0, sbi->s_groups_count * sizeof(*sbi->s_debts));
845 for (i = 0; i < db_count; i++) {
846 block = descriptor_loc(sb, logic_sb_block, i);
847 sbi->s_group_desc[i] = sb_bread(sb, block);
848 if (!sbi->s_group_desc[i]) {
849 for (j = 0; j < i; j++)
850 brelse (sbi->s_group_desc[j]);
851 printk ("EXT2-fs: unable to read group descriptors\n");
852 goto failed_mount_group_desc;
853 }
854 }
855 if (!ext2_check_descriptors (sb)) {
856 printk ("EXT2-fs: group descriptors corrupted!\n");
857 db_count = i;
858 goto failed_mount2;
859 }
860 sbi->s_gdb_count = db_count;
861 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
862 spin_lock_init(&sbi->s_next_gen_lock);
863 /*
864 * set up enough so that it can read an inode
865 */
866 sb->s_op = &ext2_sops;
867 sb->s_export_op = &ext2_export_ops;
868 sb->s_xattr = ext2_xattr_handlers;
869 root = iget(sb, EXT2_ROOT_INO);
870 sb->s_root = d_alloc_root(root);
871 if (!sb->s_root) {
872 iput(root);
873 printk(KERN_ERR "EXT2-fs: get root inode failed\n");
874 goto failed_mount2;
875 }
876 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
877 dput(sb->s_root);
878 sb->s_root = NULL;
879 printk(KERN_ERR "EXT2-fs: corrupt root inode, run e2fsck\n");
880 goto failed_mount2;
881 }
882 if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL))
883 ext2_warning(sb, __FUNCTION__,
884 "mounting ext3 filesystem as ext2");
885 ext2_setup_super (sb, es, sb->s_flags & MS_RDONLY);
886 percpu_counter_mod(&sbi->s_freeblocks_counter,
887 ext2_count_free_blocks(sb));
888 percpu_counter_mod(&sbi->s_freeinodes_counter,
889 ext2_count_free_inodes(sb));
890 percpu_counter_mod(&sbi->s_dirs_counter,
891 ext2_count_dirs(sb));
892 return 0;
893
894 cantfind_ext2:
895 if (!silent)
896 printk("VFS: Can't find an ext2 filesystem on dev %s.\n",
897 sb->s_id);
898 goto failed_mount;
899
900 failed_mount2:
901 for (i = 0; i < db_count; i++)
902 brelse(sbi->s_group_desc[i]);
903 failed_mount_group_desc:
904 kfree(sbi->s_group_desc);
905 kfree(sbi->s_debts);
906 failed_mount:
907 brelse(bh);
908 failed_sbi:
909 sb->s_fs_info = NULL;
910 kfree(sbi);
911 return -EINVAL;
912 }
913
914 static void ext2_commit_super (struct super_block * sb,
915 struct ext2_super_block * es)
916 {
917 es->s_wtime = cpu_to_le32(get_seconds());
918 mark_buffer_dirty(EXT2_SB(sb)->s_sbh);
919 sb->s_dirt = 0;
920 }
921
922 static void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es)
923 {
924 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb));
925 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb));
926 es->s_wtime = cpu_to_le32(get_seconds());
927 mark_buffer_dirty(EXT2_SB(sb)->s_sbh);
928 sync_dirty_buffer(EXT2_SB(sb)->s_sbh);
929 sb->s_dirt = 0;
930 }
931
932 /*
933 * In the second extended file system, it is not necessary to
934 * write the super block since we use a mapping of the
935 * disk super block in a buffer.
936 *
937 * However, this function is still used to set the fs valid
938 * flags to 0. We need to set this flag to 0 since the fs
939 * may have been checked while mounted and e2fsck may have
940 * set s_state to EXT2_VALID_FS after some corrections.
941 */
942
943 void ext2_write_super (struct super_block * sb)
944 {
945 struct ext2_super_block * es;
946 lock_kernel();
947 if (!(sb->s_flags & MS_RDONLY)) {
948 es = EXT2_SB(sb)->s_es;
949
950 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS) {
951 ext2_debug ("setting valid to 0\n");
952 es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) &
953 ~EXT2_VALID_FS);
954 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb));
955 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb));
956 es->s_mtime = cpu_to_le32(get_seconds());
957 ext2_sync_super(sb, es);
958 } else
959 ext2_commit_super (sb, es);
960 }
961 sb->s_dirt = 0;
962 unlock_kernel();
963 }
964
965 static int ext2_remount (struct super_block * sb, int * flags, char * data)
966 {
967 struct ext2_sb_info * sbi = EXT2_SB(sb);
968 struct ext2_super_block * es;
969 unsigned long old_mount_opt = sbi->s_mount_opt;
970 struct ext2_mount_options old_opts;
971 unsigned long old_sb_flags;
972 int err;
973
974 /* Store the old options */
975 old_sb_flags = sb->s_flags;
976 old_opts.s_mount_opt = sbi->s_mount_opt;
977 old_opts.s_resuid = sbi->s_resuid;
978 old_opts.s_resgid = sbi->s_resgid;
979
980 /*
981 * Allow the "check" option to be passed as a remount option.
982 */
983 if (!parse_options (data, sbi)) {
984 err = -EINVAL;
985 goto restore_opts;
986 }
987
988 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
989 ((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
990
991 es = sbi->s_es;
992 if (((sbi->s_mount_opt & EXT2_MOUNT_XIP) !=
993 (old_mount_opt & EXT2_MOUNT_XIP)) &&
994 invalidate_inodes(sb))
995 ext2_warning(sb, __FUNCTION__, "busy inodes while remounting "\
996 "xip remain in cache (no functional problem)");
997 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
998 return 0;
999 if (*flags & MS_RDONLY) {
1000 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS ||
1001 !(sbi->s_mount_state & EXT2_VALID_FS))
1002 return 0;
1003 /*
1004 * OK, we are remounting a valid rw partition rdonly, so set
1005 * the rdonly flag and then mark the partition as valid again.
1006 */
1007 es->s_state = cpu_to_le16(sbi->s_mount_state);
1008 es->s_mtime = cpu_to_le32(get_seconds());
1009 } else {
1010 __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb,
1011 ~EXT2_FEATURE_RO_COMPAT_SUPP);
1012 if (ret) {
1013 printk("EXT2-fs: %s: couldn't remount RDWR because of "
1014 "unsupported optional features (%x).\n",
1015 sb->s_id, le32_to_cpu(ret));
1016 err = -EROFS;
1017 goto restore_opts;
1018 }
1019 /*
1020 * Mounting a RDONLY partition read-write, so reread and
1021 * store the current valid flag. (It may have been changed
1022 * by e2fsck since we originally mounted the partition.)
1023 */
1024 sbi->s_mount_state = le16_to_cpu(es->s_state);
1025 if (!ext2_setup_super (sb, es, 0))
1026 sb->s_flags &= ~MS_RDONLY;
1027 }
1028 ext2_sync_super(sb, es);
1029 return 0;
1030 restore_opts:
1031 sbi->s_mount_opt = old_opts.s_mount_opt;
1032 sbi->s_resuid = old_opts.s_resuid;
1033 sbi->s_resgid = old_opts.s_resgid;
1034 sb->s_flags = old_sb_flags;
1035 return err;
1036 }
1037
1038 static int ext2_statfs (struct super_block * sb, struct kstatfs * buf)
1039 {
1040 struct ext2_sb_info *sbi = EXT2_SB(sb);
1041 unsigned long overhead;
1042 int i;
1043
1044 if (test_opt (sb, MINIX_DF))
1045 overhead = 0;
1046 else {
1047 /*
1048 * Compute the overhead (FS structures)
1049 */
1050
1051 /*
1052 * All of the blocks before first_data_block are
1053 * overhead
1054 */
1055 overhead = le32_to_cpu(sbi->s_es->s_first_data_block);
1056
1057 /*
1058 * Add the overhead attributed to the superblock and
1059 * block group descriptors. If the sparse superblocks
1060 * feature is turned on, then not all groups have this.
1061 */
1062 for (i = 0; i < sbi->s_groups_count; i++)
1063 overhead += ext2_bg_has_super(sb, i) +
1064 ext2_bg_num_gdb(sb, i);
1065
1066 /*
1067 * Every block group has an inode bitmap, a block
1068 * bitmap, and an inode table.
1069 */
1070 overhead += (sbi->s_groups_count *
1071 (2 + sbi->s_itb_per_group));
1072 }
1073
1074 buf->f_type = EXT2_SUPER_MAGIC;
1075 buf->f_bsize = sb->s_blocksize;
1076 buf->f_blocks = le32_to_cpu(sbi->s_es->s_blocks_count) - overhead;
1077 buf->f_bfree = ext2_count_free_blocks(sb);
1078 buf->f_bavail = buf->f_bfree - le32_to_cpu(sbi->s_es->s_r_blocks_count);
1079 if (buf->f_bfree < le32_to_cpu(sbi->s_es->s_r_blocks_count))
1080 buf->f_bavail = 0;
1081 buf->f_files = le32_to_cpu(sbi->s_es->s_inodes_count);
1082 buf->f_ffree = ext2_count_free_inodes (sb);
1083 buf->f_namelen = EXT2_NAME_LEN;
1084 return 0;
1085 }
1086
1087 static struct super_block *ext2_get_sb(struct file_system_type *fs_type,
1088 int flags, const char *dev_name, void *data)
1089 {
1090 return get_sb_bdev(fs_type, flags, dev_name, data, ext2_fill_super);
1091 }
1092
1093 #ifdef CONFIG_QUOTA
1094
1095 /* Read data from quotafile - avoid pagecache and such because we cannot afford
1096 * acquiring the locks... As quota files are never truncated and quota code
1097 * itself serializes the operations (and noone else should touch the files)
1098 * we don't have to be afraid of races */
1099 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data,
1100 size_t len, loff_t off)
1101 {
1102 struct inode *inode = sb_dqopt(sb)->files[type];
1103 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb);
1104 int err = 0;
1105 int offset = off & (sb->s_blocksize - 1);
1106 int tocopy;
1107 size_t toread;
1108 struct buffer_head tmp_bh;
1109 struct buffer_head *bh;
1110 loff_t i_size = i_size_read(inode);
1111
1112 if (off > i_size)
1113 return 0;
1114 if (off+len > i_size)
1115 len = i_size-off;
1116 toread = len;
1117 while (toread > 0) {
1118 tocopy = sb->s_blocksize - offset < toread ?
1119 sb->s_blocksize - offset : toread;
1120
1121 tmp_bh.b_state = 0;
1122 err = ext2_get_block(inode, blk, &tmp_bh, 0);
1123 if (err)
1124 return err;
1125 if (!buffer_mapped(&tmp_bh)) /* A hole? */
1126 memset(data, 0, tocopy);
1127 else {
1128 bh = sb_bread(sb, tmp_bh.b_blocknr);
1129 if (!bh)
1130 return -EIO;
1131 memcpy(data, bh->b_data+offset, tocopy);
1132 brelse(bh);
1133 }
1134 offset = 0;
1135 toread -= tocopy;
1136 data += tocopy;
1137 blk++;
1138 }
1139 return len;
1140 }
1141
1142 /* Write to quotafile */
1143 static ssize_t ext2_quota_write(struct super_block *sb, int type,
1144 const char *data, size_t len, loff_t off)
1145 {
1146 struct inode *inode = sb_dqopt(sb)->files[type];
1147 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb);
1148 int err = 0;
1149 int offset = off & (sb->s_blocksize - 1);
1150 int tocopy;
1151 size_t towrite = len;
1152 struct buffer_head tmp_bh;
1153 struct buffer_head *bh;
1154
1155 mutex_lock(&inode->i_mutex);
1156 while (towrite > 0) {
1157 tocopy = sb->s_blocksize - offset < towrite ?
1158 sb->s_blocksize - offset : towrite;
1159
1160 tmp_bh.b_state = 0;
1161 err = ext2_get_block(inode, blk, &tmp_bh, 1);
1162 if (err)
1163 goto out;
1164 if (offset || tocopy != EXT2_BLOCK_SIZE(sb))
1165 bh = sb_bread(sb, tmp_bh.b_blocknr);
1166 else
1167 bh = sb_getblk(sb, tmp_bh.b_blocknr);
1168 if (!bh) {
1169 err = -EIO;
1170 goto out;
1171 }
1172 lock_buffer(bh);
1173 memcpy(bh->b_data+offset, data, tocopy);
1174 flush_dcache_page(bh->b_page);
1175 set_buffer_uptodate(bh);
1176 mark_buffer_dirty(bh);
1177 unlock_buffer(bh);
1178 brelse(bh);
1179 offset = 0;
1180 towrite -= tocopy;
1181 data += tocopy;
1182 blk++;
1183 }
1184 out:
1185 if (len == towrite)
1186 return err;
1187 if (inode->i_size < off+len-towrite)
1188 i_size_write(inode, off+len-towrite);
1189 inode->i_version++;
1190 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
1191 mark_inode_dirty(inode);
1192 mutex_unlock(&inode->i_mutex);
1193 return len - towrite;
1194 }
1195
1196 #endif
1197
1198 static struct file_system_type ext2_fs_type = {
1199 .owner = THIS_MODULE,
1200 .name = "ext2",
1201 .get_sb = ext2_get_sb,
1202 .kill_sb = kill_block_super,
1203 .fs_flags = FS_REQUIRES_DEV,
1204 };
1205
1206 static int __init init_ext2_fs(void)
1207 {
1208 int err = init_ext2_xattr();
1209 if (err)
1210 return err;
1211 err = init_inodecache();
1212 if (err)
1213 goto out1;
1214 err = register_filesystem(&ext2_fs_type);
1215 if (err)
1216 goto out;
1217 return 0;
1218 out:
1219 destroy_inodecache();
1220 out1:
1221 exit_ext2_xattr();
1222 return err;
1223 }
1224
1225 static void __exit exit_ext2_fs(void)
1226 {
1227 unregister_filesystem(&ext2_fs_type);
1228 destroy_inodecache();
1229 exit_ext2_xattr();
1230 }
1231
1232 module_init(init_ext2_fs)
1233 module_exit(exit_ext2_fs)
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