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[SPARC64]: Fix 2 bugs in huge page support.
[linux-2.6/verdex.git] / fs / ext2 / super.c
blobcb6f9bd658de9646da588af8feacb64bbe1d3742
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 #if defined(CONFIG_EXT2_FS_XIP)
225 if (sbi->s_mount_opt & EXT2_MOUNT_XIP)
226 seq_puts(seq, ",xip");
227 #endif
228
229 return 0;
230 }
231
232 #ifdef CONFIG_QUOTA
233 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off);
234 static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off);
235 #endif
236
237 static struct super_operations ext2_sops = {
238 .alloc_inode = ext2_alloc_inode,
239 .destroy_inode = ext2_destroy_inode,
240 .read_inode = ext2_read_inode,
241 .write_inode = ext2_write_inode,
242 .put_inode = ext2_put_inode,
243 .delete_inode = ext2_delete_inode,
244 .put_super = ext2_put_super,
245 .write_super = ext2_write_super,
246 .statfs = ext2_statfs,
247 .remount_fs = ext2_remount,
248 .clear_inode = ext2_clear_inode,
249 .show_options = ext2_show_options,
250 #ifdef CONFIG_QUOTA
251 .quota_read = ext2_quota_read,
252 .quota_write = ext2_quota_write,
253 #endif
254 };
255
256 /* Yes, most of these are left as NULL!!
257 * A NULL value implies the default, which works with ext2-like file
258 * systems, but can be improved upon.
259 * Currently only get_parent is required.
260 */
261 struct dentry *ext2_get_parent(struct dentry *child);
262 static struct export_operations ext2_export_ops = {
263 .get_parent = ext2_get_parent,
264 };
265
266 static unsigned long get_sb_block(void **data)
267 {
268 unsigned long sb_block;
269 char *options = (char *) *data;
270
271 if (!options || strncmp(options, "sb=", 3) != 0)
272 return 1; /* Default location */
273 options += 3;
274 sb_block = simple_strtoul(options, &options, 0);
275 if (*options && *options != ',') {
276 printk("EXT2-fs: Invalid sb specification: %s\n",
277 (char *) *data);
278 return 1;
279 }
280 if (*options == ',')
281 options++;
282 *data = (void *) options;
283 return sb_block;
284 }
285
286 enum {
287 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
288 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic,
289 Opt_err_ro, Opt_nouid32, Opt_nocheck, Opt_debug,
290 Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr,
291 Opt_acl, Opt_noacl, Opt_xip, Opt_ignore, Opt_err, Opt_quota,
292 Opt_usrquota, Opt_grpquota
293 };
294
295 static match_table_t tokens = {
296 {Opt_bsd_df, "bsddf"},
297 {Opt_minix_df, "minixdf"},
298 {Opt_grpid, "grpid"},
299 {Opt_grpid, "bsdgroups"},
300 {Opt_nogrpid, "nogrpid"},
301 {Opt_nogrpid, "sysvgroups"},
302 {Opt_resgid, "resgid=%u"},
303 {Opt_resuid, "resuid=%u"},
304 {Opt_sb, "sb=%u"},
305 {Opt_err_cont, "errors=continue"},
306 {Opt_err_panic, "errors=panic"},
307 {Opt_err_ro, "errors=remount-ro"},
308 {Opt_nouid32, "nouid32"},
309 {Opt_nocheck, "check=none"},
310 {Opt_nocheck, "nocheck"},
311 {Opt_debug, "debug"},
312 {Opt_oldalloc, "oldalloc"},
313 {Opt_orlov, "orlov"},
314 {Opt_nobh, "nobh"},
315 {Opt_user_xattr, "user_xattr"},
316 {Opt_nouser_xattr, "nouser_xattr"},
317 {Opt_acl, "acl"},
318 {Opt_noacl, "noacl"},
319 {Opt_xip, "xip"},
320 {Opt_grpquota, "grpquota"},
321 {Opt_ignore, "noquota"},
322 {Opt_quota, "quota"},
323 {Opt_usrquota, "usrquota"},
324 {Opt_err, NULL}
325 };
326
327 static int parse_options (char * options,
328 struct ext2_sb_info *sbi)
329 {
330 char * p;
331 substring_t args[MAX_OPT_ARGS];
332 unsigned long kind = EXT2_MOUNT_ERRORS_CONT;
333 int option;
334
335 if (!options)
336 return 1;
337
338 while ((p = strsep (&options, ",")) != NULL) {
339 int token;
340 if (!*p)
341 continue;
342
343 token = match_token(p, tokens, args);
344 switch (token) {
345 case Opt_bsd_df:
346 clear_opt (sbi->s_mount_opt, MINIX_DF);
347 break;
348 case Opt_minix_df:
349 set_opt (sbi->s_mount_opt, MINIX_DF);
350 break;
351 case Opt_grpid:
352 set_opt (sbi->s_mount_opt, GRPID);
353 break;
354 case Opt_nogrpid:
355 clear_opt (sbi->s_mount_opt, GRPID);
356 break;
357 case Opt_resuid:
358 if (match_int(&args[0], &option))
359 return 0;
360 sbi->s_resuid = option;
361 break;
362 case Opt_resgid:
363 if (match_int(&args[0], &option))
364 return 0;
365 sbi->s_resgid = option;
366 break;
367 case Opt_sb:
368 /* handled by get_sb_block() instead of here */
369 /* *sb_block = match_int(&args[0]); */
370 break;
371 case Opt_err_panic:
372 kind = EXT2_MOUNT_ERRORS_PANIC;
373 break;
374 case Opt_err_ro:
375 kind = EXT2_MOUNT_ERRORS_RO;
376 break;
377 case Opt_err_cont:
378 kind = EXT2_MOUNT_ERRORS_CONT;
379 break;
380 case Opt_nouid32:
381 set_opt (sbi->s_mount_opt, NO_UID32);
382 break;
383 case Opt_nocheck:
384 clear_opt (sbi->s_mount_opt, CHECK);
385 break;
386 case Opt_debug:
387 set_opt (sbi->s_mount_opt, DEBUG);
388 break;
389 case Opt_oldalloc:
390 set_opt (sbi->s_mount_opt, OLDALLOC);
391 break;
392 case Opt_orlov:
393 clear_opt (sbi->s_mount_opt, OLDALLOC);
394 break;
395 case Opt_nobh:
396 set_opt (sbi->s_mount_opt, NOBH);
397 break;
398 #ifdef CONFIG_EXT2_FS_XATTR
399 case Opt_user_xattr:
400 set_opt (sbi->s_mount_opt, XATTR_USER);
401 break;
402 case Opt_nouser_xattr:
403 clear_opt (sbi->s_mount_opt, XATTR_USER);
404 break;
405 #else
406 case Opt_user_xattr:
407 case Opt_nouser_xattr:
408 printk("EXT2 (no)user_xattr options not supported\n");
409 break;
410 #endif
411 #ifdef CONFIG_EXT2_FS_POSIX_ACL
412 case Opt_acl:
413 set_opt(sbi->s_mount_opt, POSIX_ACL);
414 break;
415 case Opt_noacl:
416 clear_opt(sbi->s_mount_opt, POSIX_ACL);
417 break;
418 #else
419 case Opt_acl:
420 case Opt_noacl:
421 printk("EXT2 (no)acl options not supported\n");
422 break;
423 #endif
424 case Opt_xip:
425 #ifdef CONFIG_EXT2_FS_XIP
426 set_opt (sbi->s_mount_opt, XIP);
427 #else
428 printk("EXT2 xip option not supported\n");
429 #endif
430 break;
431
432 #if defined(CONFIG_QUOTA)
433 case Opt_quota:
434 case Opt_usrquota:
435 set_opt(sbi->s_mount_opt, USRQUOTA);
436 break;
437
438 case Opt_grpquota:
439 set_opt(sbi->s_mount_opt, GRPQUOTA);
440 break;
441 #else
442 case Opt_quota:
443 case Opt_usrquota:
444 case Opt_grpquota:
445 printk(KERN_ERR
446 "EXT2-fs: quota operations not supported.\n");
447
448 break;
449 #endif
450
451 case Opt_ignore:
452 break;
453 default:
454 return 0;
455 }
456 }
457 sbi->s_mount_opt |= kind;
458 return 1;
459 }
460
461 static int ext2_setup_super (struct super_block * sb,
462 struct ext2_super_block * es,
463 int read_only)
464 {
465 int res = 0;
466 struct ext2_sb_info *sbi = EXT2_SB(sb);
467
468 if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) {
469 printk ("EXT2-fs warning: revision level too high, "
470 "forcing read-only mode\n");
471 res = MS_RDONLY;
472 }
473 if (read_only)
474 return res;
475 if (!(sbi->s_mount_state & EXT2_VALID_FS))
476 printk ("EXT2-fs warning: mounting unchecked fs, "
477 "running e2fsck is recommended\n");
478 else if ((sbi->s_mount_state & EXT2_ERROR_FS))
479 printk ("EXT2-fs warning: mounting fs with errors, "
480 "running e2fsck is recommended\n");
481 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
482 le16_to_cpu(es->s_mnt_count) >=
483 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
484 printk ("EXT2-fs warning: maximal mount count reached, "
485 "running e2fsck is recommended\n");
486 else if (le32_to_cpu(es->s_checkinterval) &&
487 (le32_to_cpu(es->s_lastcheck) + le32_to_cpu(es->s_checkinterval) <= get_seconds()))
488 printk ("EXT2-fs warning: checktime reached, "
489 "running e2fsck is recommended\n");
490 if (!le16_to_cpu(es->s_max_mnt_count))
491 es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT);
492 es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
493 ext2_write_super(sb);
494 if (test_opt (sb, DEBUG))
495 printk ("[EXT II FS %s, %s, bs=%lu, fs=%lu, gc=%lu, "
496 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
497 EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize,
498 sbi->s_frag_size,
499 sbi->s_groups_count,
500 EXT2_BLOCKS_PER_GROUP(sb),
501 EXT2_INODES_PER_GROUP(sb),
502 sbi->s_mount_opt);
503 return res;
504 }
505
506 static int ext2_check_descriptors (struct super_block * sb)
507 {
508 int i;
509 int desc_block = 0;
510 struct ext2_sb_info *sbi = EXT2_SB(sb);
511 unsigned long block = le32_to_cpu(sbi->s_es->s_first_data_block);
512 struct ext2_group_desc * gdp = NULL;
513
514 ext2_debug ("Checking group descriptors");
515
516 for (i = 0; i < sbi->s_groups_count; i++)
517 {
518 if ((i % EXT2_DESC_PER_BLOCK(sb)) == 0)
519 gdp = (struct ext2_group_desc *) sbi->s_group_desc[desc_block++]->b_data;
520 if (le32_to_cpu(gdp->bg_block_bitmap) < block ||
521 le32_to_cpu(gdp->bg_block_bitmap) >= block + EXT2_BLOCKS_PER_GROUP(sb))
522 {
523 ext2_error (sb, "ext2_check_descriptors",
524 "Block bitmap for group %d"
525 " not in group (block %lu)!",
526 i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap));
527 return 0;
528 }
529 if (le32_to_cpu(gdp->bg_inode_bitmap) < block ||
530 le32_to_cpu(gdp->bg_inode_bitmap) >= block + EXT2_BLOCKS_PER_GROUP(sb))
531 {
532 ext2_error (sb, "ext2_check_descriptors",
533 "Inode bitmap for group %d"
534 " not in group (block %lu)!",
535 i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap));
536 return 0;
537 }
538 if (le32_to_cpu(gdp->bg_inode_table) < block ||
539 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group >=
540 block + EXT2_BLOCKS_PER_GROUP(sb))
541 {
542 ext2_error (sb, "ext2_check_descriptors",
543 "Inode table for group %d"
544 " not in group (block %lu)!",
545 i, (unsigned long) le32_to_cpu(gdp->bg_inode_table));
546 return 0;
547 }
548 block += EXT2_BLOCKS_PER_GROUP(sb);
549 gdp++;
550 }
551 return 1;
552 }
553
554 #define log2(n) ffz(~(n))
555
556 /*
557 * Maximal file size. There is a direct, and {,double-,triple-}indirect
558 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
559 * We need to be 1 filesystem block less than the 2^32 sector limit.
560 */
561 static loff_t ext2_max_size(int bits)
562 {
563 loff_t res = EXT2_NDIR_BLOCKS;
564 /* This constant is calculated to be the largest file size for a
565 * dense, 4k-blocksize file such that the total number of
566 * sectors in the file, including data and all indirect blocks,
567 * does not exceed 2^32. */
568 const loff_t upper_limit = 0x1ff7fffd000LL;
569
570 res += 1LL << (bits-2);
571 res += 1LL << (2*(bits-2));
572 res += 1LL << (3*(bits-2));
573 res <<= bits;
574 if (res > upper_limit)
575 res = upper_limit;
576 return res;
577 }
578
579 static unsigned long descriptor_loc(struct super_block *sb,
580 unsigned long logic_sb_block,
581 int nr)
582 {
583 struct ext2_sb_info *sbi = EXT2_SB(sb);
584 unsigned long bg, first_data_block, first_meta_bg;
585 int has_super = 0;
586
587 first_data_block = le32_to_cpu(sbi->s_es->s_first_data_block);
588 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
589
590 if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) ||
591 nr < first_meta_bg)
592 return (logic_sb_block + nr + 1);
593 bg = sbi->s_desc_per_block * nr;
594 if (ext2_bg_has_super(sb, bg))
595 has_super = 1;
596 return (first_data_block + has_super + (bg * sbi->s_blocks_per_group));
597 }
598
599 static int ext2_fill_super(struct super_block *sb, void *data, int silent)
600 {
601 struct buffer_head * bh;
602 struct ext2_sb_info * sbi;
603 struct ext2_super_block * es;
604 struct inode *root;
605 unsigned long block;
606 unsigned long sb_block = get_sb_block(&data);
607 unsigned long logic_sb_block;
608 unsigned long offset = 0;
609 unsigned long def_mount_opts;
610 int blocksize = BLOCK_SIZE;
611 int db_count;
612 int i, j;
613 __le32 features;
614
615 sbi = kmalloc(sizeof(*sbi), GFP_KERNEL);
616 if (!sbi)
617 return -ENOMEM;
618 sb->s_fs_info = sbi;
619 memset(sbi, 0, sizeof(*sbi));
620
621 /*
622 * See what the current blocksize for the device is, and
623 * use that as the blocksize. Otherwise (or if the blocksize
624 * is smaller than the default) use the default.
625 * This is important for devices that have a hardware
626 * sectorsize that is larger than the default.
627 */
628 blocksize = sb_min_blocksize(sb, BLOCK_SIZE);
629 if (!blocksize) {
630 printk ("EXT2-fs: unable to set blocksize\n");
631 goto failed_sbi;
632 }
633
634 /*
635 * If the superblock doesn't start on a hardware sector boundary,
636 * calculate the offset.
637 */
638 if (blocksize != BLOCK_SIZE) {
639 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
640 offset = (sb_block*BLOCK_SIZE) % blocksize;
641 } else {
642 logic_sb_block = sb_block;
643 }
644
645 if (!(bh = sb_bread(sb, logic_sb_block))) {
646 printk ("EXT2-fs: unable to read superblock\n");
647 goto failed_sbi;
648 }
649 /*
650 * Note: s_es must be initialized as soon as possible because
651 * some ext2 macro-instructions depend on its value
652 */
653 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
654 sbi->s_es = es;
655 sb->s_magic = le16_to_cpu(es->s_magic);
656
657 if (sb->s_magic != EXT2_SUPER_MAGIC)
658 goto cantfind_ext2;
659
660 /* Set defaults before we parse the mount options */
661 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
662 if (def_mount_opts & EXT2_DEFM_DEBUG)
663 set_opt(sbi->s_mount_opt, DEBUG);
664 if (def_mount_opts & EXT2_DEFM_BSDGROUPS)
665 set_opt(sbi->s_mount_opt, GRPID);
666 if (def_mount_opts & EXT2_DEFM_UID16)
667 set_opt(sbi->s_mount_opt, NO_UID32);
668 if (def_mount_opts & EXT2_DEFM_XATTR_USER)
669 set_opt(sbi->s_mount_opt, XATTR_USER);
670 if (def_mount_opts & EXT2_DEFM_ACL)
671 set_opt(sbi->s_mount_opt, POSIX_ACL);
672
673 if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC)
674 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
675 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_RO)
676 set_opt(sbi->s_mount_opt, ERRORS_RO);
677
678 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
679 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
680
681 if (!parse_options ((char *) data, sbi))
682 goto failed_mount;
683
684 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
685 ((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ?
686 MS_POSIXACL : 0);
687
688 ext2_xip_verify_sb(sb); /* see if bdev supports xip, unset
689 EXT2_MOUNT_XIP if not */
690
691 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV &&
692 (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) ||
693 EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
694 EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U)))
695 printk("EXT2-fs warning: feature flags set on rev 0 fs, "
696 "running e2fsck is recommended\n");
697 /*
698 * Check feature flags regardless of the revision level, since we
699 * previously didn't change the revision level when setting the flags,
700 * so there is a chance incompat flags are set on a rev 0 filesystem.
701 */
702 features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP);
703 if (features) {
704 printk("EXT2-fs: %s: couldn't mount because of "
705 "unsupported optional features (%x).\n",
706 sb->s_id, le32_to_cpu(features));
707 goto failed_mount;
708 }
709 if (!(sb->s_flags & MS_RDONLY) &&
710 (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){
711 printk("EXT2-fs: %s: couldn't mount RDWR because of "
712 "unsupported optional features (%x).\n",
713 sb->s_id, le32_to_cpu(features));
714 goto failed_mount;
715 }
716
717 blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
718
719 if ((ext2_use_xip(sb)) && ((blocksize != PAGE_SIZE) ||
720 (sb->s_blocksize != blocksize))) {
721 if (!silent)
722 printk("XIP: Unsupported blocksize\n");
723 goto failed_mount;
724 }
725
726 /* If the blocksize doesn't match, re-read the thing.. */
727 if (sb->s_blocksize != blocksize) {
728 brelse(bh);
729
730 if (!sb_set_blocksize(sb, blocksize)) {
731 printk(KERN_ERR "EXT2-fs: blocksize too small for device.\n");
732 goto failed_sbi;
733 }
734
735 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
736 offset = (sb_block*BLOCK_SIZE) % blocksize;
737 bh = sb_bread(sb, logic_sb_block);
738 if(!bh) {
739 printk("EXT2-fs: Couldn't read superblock on "
740 "2nd try.\n");
741 goto failed_sbi;
742 }
743 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
744 sbi->s_es = es;
745 if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) {
746 printk ("EXT2-fs: Magic mismatch, very weird !\n");
747 goto failed_mount;
748 }
749 }
750
751 sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits);
752
753 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) {
754 sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE;
755 sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO;
756 } else {
757 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
758 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
759 if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) ||
760 (sbi->s_inode_size & (sbi->s_inode_size - 1)) ||
761 (sbi->s_inode_size > blocksize)) {
762 printk ("EXT2-fs: unsupported inode size: %d\n",
763 sbi->s_inode_size);
764 goto failed_mount;
765 }
766 }
767
768 sbi->s_frag_size = EXT2_MIN_FRAG_SIZE <<
769 le32_to_cpu(es->s_log_frag_size);
770 if (sbi->s_frag_size == 0)
771 goto cantfind_ext2;
772 sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size;
773
774 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
775 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
776 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
777
778 if (EXT2_INODE_SIZE(sb) == 0)
779 goto cantfind_ext2;
780 sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb);
781 if (sbi->s_inodes_per_block == 0)
782 goto cantfind_ext2;
783 sbi->s_itb_per_group = sbi->s_inodes_per_group /
784 sbi->s_inodes_per_block;
785 sbi->s_desc_per_block = sb->s_blocksize /
786 sizeof (struct ext2_group_desc);
787 sbi->s_sbh = bh;
788 sbi->s_mount_state = le16_to_cpu(es->s_state);
789 sbi->s_addr_per_block_bits =
790 log2 (EXT2_ADDR_PER_BLOCK(sb));
791 sbi->s_desc_per_block_bits =
792 log2 (EXT2_DESC_PER_BLOCK(sb));
793
794 if (sb->s_magic != EXT2_SUPER_MAGIC)
795 goto cantfind_ext2;
796
797 if (sb->s_blocksize != bh->b_size) {
798 if (!silent)
799 printk ("VFS: Unsupported blocksize on dev "
800 "%s.\n", sb->s_id);
801 goto failed_mount;
802 }
803
804 if (sb->s_blocksize != sbi->s_frag_size) {
805 printk ("EXT2-fs: fragsize %lu != blocksize %lu (not supported yet)\n",
806 sbi->s_frag_size, sb->s_blocksize);
807 goto failed_mount;
808 }
809
810 if (sbi->s_blocks_per_group > sb->s_blocksize * 8) {
811 printk ("EXT2-fs: #blocks per group too big: %lu\n",
812 sbi->s_blocks_per_group);
813 goto failed_mount;
814 }
815 if (sbi->s_frags_per_group > sb->s_blocksize * 8) {
816 printk ("EXT2-fs: #fragments per group too big: %lu\n",
817 sbi->s_frags_per_group);
818 goto failed_mount;
819 }
820 if (sbi->s_inodes_per_group > sb->s_blocksize * 8) {
821 printk ("EXT2-fs: #inodes per group too big: %lu\n",
822 sbi->s_inodes_per_group);
823 goto failed_mount;
824 }
825
826 if (EXT2_BLOCKS_PER_GROUP(sb) == 0)
827 goto cantfind_ext2;
828 sbi->s_groups_count = (le32_to_cpu(es->s_blocks_count) -
829 le32_to_cpu(es->s_first_data_block) +
830 EXT2_BLOCKS_PER_GROUP(sb) - 1) /
831 EXT2_BLOCKS_PER_GROUP(sb);
832 db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) /
833 EXT2_DESC_PER_BLOCK(sb);
834 sbi->s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL);
835 if (sbi->s_group_desc == NULL) {
836 printk ("EXT2-fs: not enough memory\n");
837 goto failed_mount;
838 }
839 percpu_counter_init(&sbi->s_freeblocks_counter);
840 percpu_counter_init(&sbi->s_freeinodes_counter);
841 percpu_counter_init(&sbi->s_dirs_counter);
842 bgl_lock_init(&sbi->s_blockgroup_lock);
843 sbi->s_debts = kmalloc(sbi->s_groups_count * sizeof(*sbi->s_debts),
844 GFP_KERNEL);
845 if (!sbi->s_debts) {
846 printk ("EXT2-fs: not enough memory\n");
847 goto failed_mount_group_desc;
848 }
849 memset(sbi->s_debts, 0, sbi->s_groups_count * sizeof(*sbi->s_debts));
850 for (i = 0; i < db_count; i++) {
851 block = descriptor_loc(sb, logic_sb_block, i);
852 sbi->s_group_desc[i] = sb_bread(sb, block);
853 if (!sbi->s_group_desc[i]) {
854 for (j = 0; j < i; j++)
855 brelse (sbi->s_group_desc[j]);
856 printk ("EXT2-fs: unable to read group descriptors\n");
857 goto failed_mount_group_desc;
858 }
859 }
860 if (!ext2_check_descriptors (sb)) {
861 printk ("EXT2-fs: group descriptors corrupted!\n");
862 db_count = i;
863 goto failed_mount2;
864 }
865 sbi->s_gdb_count = db_count;
866 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
867 spin_lock_init(&sbi->s_next_gen_lock);
868 /*
869 * set up enough so that it can read an inode
870 */
871 sb->s_op = &ext2_sops;
872 sb->s_export_op = &ext2_export_ops;
873 sb->s_xattr = ext2_xattr_handlers;
874 root = iget(sb, EXT2_ROOT_INO);
875 sb->s_root = d_alloc_root(root);
876 if (!sb->s_root) {
877 iput(root);
878 printk(KERN_ERR "EXT2-fs: get root inode failed\n");
879 goto failed_mount2;
880 }
881 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
882 dput(sb->s_root);
883 sb->s_root = NULL;
884 printk(KERN_ERR "EXT2-fs: corrupt root inode, run e2fsck\n");
885 goto failed_mount2;
886 }
887 if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL))
888 ext2_warning(sb, __FUNCTION__,
889 "mounting ext3 filesystem as ext2");
890 ext2_setup_super (sb, es, sb->s_flags & MS_RDONLY);
891 percpu_counter_mod(&sbi->s_freeblocks_counter,
892 ext2_count_free_blocks(sb));
893 percpu_counter_mod(&sbi->s_freeinodes_counter,
894 ext2_count_free_inodes(sb));
895 percpu_counter_mod(&sbi->s_dirs_counter,
896 ext2_count_dirs(sb));
897 return 0;
898
899 cantfind_ext2:
900 if (!silent)
901 printk("VFS: Can't find an ext2 filesystem on dev %s.\n",
902 sb->s_id);
903 goto failed_mount;
904
905 failed_mount2:
906 for (i = 0; i < db_count; i++)
907 brelse(sbi->s_group_desc[i]);
908 failed_mount_group_desc:
909 kfree(sbi->s_group_desc);
910 kfree(sbi->s_debts);
911 failed_mount:
912 brelse(bh);
913 failed_sbi:
914 sb->s_fs_info = NULL;
915 kfree(sbi);
916 return -EINVAL;
917 }
918
919 static void ext2_commit_super (struct super_block * sb,
920 struct ext2_super_block * es)
921 {
922 es->s_wtime = cpu_to_le32(get_seconds());
923 mark_buffer_dirty(EXT2_SB(sb)->s_sbh);
924 sb->s_dirt = 0;
925 }
926
927 static void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es)
928 {
929 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb));
930 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb));
931 es->s_wtime = cpu_to_le32(get_seconds());
932 mark_buffer_dirty(EXT2_SB(sb)->s_sbh);
933 sync_dirty_buffer(EXT2_SB(sb)->s_sbh);
934 sb->s_dirt = 0;
935 }
936
937 /*
938 * In the second extended file system, it is not necessary to
939 * write the super block since we use a mapping of the
940 * disk super block in a buffer.
941 *
942 * However, this function is still used to set the fs valid
943 * flags to 0. We need to set this flag to 0 since the fs
944 * may have been checked while mounted and e2fsck may have
945 * set s_state to EXT2_VALID_FS after some corrections.
946 */
947
948 void ext2_write_super (struct super_block * sb)
949 {
950 struct ext2_super_block * es;
951 lock_kernel();
952 if (!(sb->s_flags & MS_RDONLY)) {
953 es = EXT2_SB(sb)->s_es;
954
955 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS) {
956 ext2_debug ("setting valid to 0\n");
957 es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) &
958 ~EXT2_VALID_FS);
959 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb));
960 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb));
961 es->s_mtime = cpu_to_le32(get_seconds());
962 ext2_sync_super(sb, es);
963 } else
964 ext2_commit_super (sb, es);
965 }
966 sb->s_dirt = 0;
967 unlock_kernel();
968 }
969
970 static int ext2_remount (struct super_block * sb, int * flags, char * data)
971 {
972 struct ext2_sb_info * sbi = EXT2_SB(sb);
973 struct ext2_super_block * es;
974 unsigned long old_mount_opt = sbi->s_mount_opt;
975 struct ext2_mount_options old_opts;
976 unsigned long old_sb_flags;
977 int err;
978
979 /* Store the old options */
980 old_sb_flags = sb->s_flags;
981 old_opts.s_mount_opt = sbi->s_mount_opt;
982 old_opts.s_resuid = sbi->s_resuid;
983 old_opts.s_resgid = sbi->s_resgid;
984
985 /*
986 * Allow the "check" option to be passed as a remount option.
987 */
988 if (!parse_options (data, sbi)) {
989 err = -EINVAL;
990 goto restore_opts;
991 }
992
993 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
994 ((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
995
996 es = sbi->s_es;
997 if (((sbi->s_mount_opt & EXT2_MOUNT_XIP) !=
998 (old_mount_opt & EXT2_MOUNT_XIP)) &&
999 invalidate_inodes(sb))
1000 ext2_warning(sb, __FUNCTION__, "busy inodes while remounting "\
1001 "xip remain in cache (no functional problem)");
1002 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
1003 return 0;
1004 if (*flags & MS_RDONLY) {
1005 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS ||
1006 !(sbi->s_mount_state & EXT2_VALID_FS))
1007 return 0;
1008 /*
1009 * OK, we are remounting a valid rw partition rdonly, so set
1010 * the rdonly flag and then mark the partition as valid again.
1011 */
1012 es->s_state = cpu_to_le16(sbi->s_mount_state);
1013 es->s_mtime = cpu_to_le32(get_seconds());
1014 } else {
1015 __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb,
1016 ~EXT2_FEATURE_RO_COMPAT_SUPP);
1017 if (ret) {
1018 printk("EXT2-fs: %s: couldn't remount RDWR because of "
1019 "unsupported optional features (%x).\n",
1020 sb->s_id, le32_to_cpu(ret));
1021 err = -EROFS;
1022 goto restore_opts;
1023 }
1024 /*
1025 * Mounting a RDONLY partition read-write, so reread and
1026 * store the current valid flag. (It may have been changed
1027 * by e2fsck since we originally mounted the partition.)
1028 */
1029 sbi->s_mount_state = le16_to_cpu(es->s_state);
1030 if (!ext2_setup_super (sb, es, 0))
1031 sb->s_flags &= ~MS_RDONLY;
1032 }
1033 ext2_sync_super(sb, es);
1034 return 0;
1035 restore_opts:
1036 sbi->s_mount_opt = old_opts.s_mount_opt;
1037 sbi->s_resuid = old_opts.s_resuid;
1038 sbi->s_resgid = old_opts.s_resgid;
1039 sb->s_flags = old_sb_flags;
1040 return err;
1041 }
1042
1043 static int ext2_statfs (struct super_block * sb, struct kstatfs * buf)
1044 {
1045 struct ext2_sb_info *sbi = EXT2_SB(sb);
1046 unsigned long overhead;
1047 int i;
1048
1049 if (test_opt (sb, MINIX_DF))
1050 overhead = 0;
1051 else {
1052 /*
1053 * Compute the overhead (FS structures)
1054 */
1055
1056 /*
1057 * All of the blocks before first_data_block are
1058 * overhead
1059 */
1060 overhead = le32_to_cpu(sbi->s_es->s_first_data_block);
1061
1062 /*
1063 * Add the overhead attributed to the superblock and
1064 * block group descriptors. If the sparse superblocks
1065 * feature is turned on, then not all groups have this.
1066 */
1067 for (i = 0; i < sbi->s_groups_count; i++)
1068 overhead += ext2_bg_has_super(sb, i) +
1069 ext2_bg_num_gdb(sb, i);
1070
1071 /*
1072 * Every block group has an inode bitmap, a block
1073 * bitmap, and an inode table.
1074 */
1075 overhead += (sbi->s_groups_count *
1076 (2 + sbi->s_itb_per_group));
1077 }
1078
1079 buf->f_type = EXT2_SUPER_MAGIC;
1080 buf->f_bsize = sb->s_blocksize;
1081 buf->f_blocks = le32_to_cpu(sbi->s_es->s_blocks_count) - overhead;
1082 buf->f_bfree = ext2_count_free_blocks(sb);
1083 buf->f_bavail = buf->f_bfree - le32_to_cpu(sbi->s_es->s_r_blocks_count);
1084 if (buf->f_bfree < le32_to_cpu(sbi->s_es->s_r_blocks_count))
1085 buf->f_bavail = 0;
1086 buf->f_files = le32_to_cpu(sbi->s_es->s_inodes_count);
1087 buf->f_ffree = ext2_count_free_inodes (sb);
1088 buf->f_namelen = EXT2_NAME_LEN;
1089 return 0;
1090 }
1091
1092 static struct super_block *ext2_get_sb(struct file_system_type *fs_type,
1093 int flags, const char *dev_name, void *data)
1094 {
1095 return get_sb_bdev(fs_type, flags, dev_name, data, ext2_fill_super);
1096 }
1097
1098 #ifdef CONFIG_QUOTA
1099
1100 /* Read data from quotafile - avoid pagecache and such because we cannot afford
1101 * acquiring the locks... As quota files are never truncated and quota code
1102 * itself serializes the operations (and noone else should touch the files)
1103 * we don't have to be afraid of races */
1104 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data,
1105 size_t len, loff_t off)
1106 {
1107 struct inode *inode = sb_dqopt(sb)->files[type];
1108 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb);
1109 int err = 0;
1110 int offset = off & (sb->s_blocksize - 1);
1111 int tocopy;
1112 size_t toread;
1113 struct buffer_head tmp_bh;
1114 struct buffer_head *bh;
1115 loff_t i_size = i_size_read(inode);
1116
1117 if (off > i_size)
1118 return 0;
1119 if (off+len > i_size)
1120 len = i_size-off;
1121 toread = len;
1122 while (toread > 0) {
1123 tocopy = sb->s_blocksize - offset < toread ?
1124 sb->s_blocksize - offset : toread;
1125
1126 tmp_bh.b_state = 0;
1127 err = ext2_get_block(inode, blk, &tmp_bh, 0);
1128 if (err)
1129 return err;
1130 if (!buffer_mapped(&tmp_bh)) /* A hole? */
1131 memset(data, 0, tocopy);
1132 else {
1133 bh = sb_bread(sb, tmp_bh.b_blocknr);
1134 if (!bh)
1135 return -EIO;
1136 memcpy(data, bh->b_data+offset, tocopy);
1137 brelse(bh);
1138 }
1139 offset = 0;
1140 toread -= tocopy;
1141 data += tocopy;
1142 blk++;
1143 }
1144 return len;
1145 }
1146
1147 /* Write to quotafile */
1148 static ssize_t ext2_quota_write(struct super_block *sb, int type,
1149 const char *data, size_t len, loff_t off)
1150 {
1151 struct inode *inode = sb_dqopt(sb)->files[type];
1152 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb);
1153 int err = 0;
1154 int offset = off & (sb->s_blocksize - 1);
1155 int tocopy;
1156 size_t towrite = len;
1157 struct buffer_head tmp_bh;
1158 struct buffer_head *bh;
1159
1160 mutex_lock(&inode->i_mutex);
1161 while (towrite > 0) {
1162 tocopy = sb->s_blocksize - offset < towrite ?
1163 sb->s_blocksize - offset : towrite;
1164
1165 tmp_bh.b_state = 0;
1166 err = ext2_get_block(inode, blk, &tmp_bh, 1);
1167 if (err)
1168 goto out;
1169 if (offset || tocopy != EXT2_BLOCK_SIZE(sb))
1170 bh = sb_bread(sb, tmp_bh.b_blocknr);
1171 else
1172 bh = sb_getblk(sb, tmp_bh.b_blocknr);
1173 if (!bh) {
1174 err = -EIO;
1175 goto out;
1176 }
1177 lock_buffer(bh);
1178 memcpy(bh->b_data+offset, data, tocopy);
1179 flush_dcache_page(bh->b_page);
1180 set_buffer_uptodate(bh);
1181 mark_buffer_dirty(bh);
1182 unlock_buffer(bh);
1183 brelse(bh);
1184 offset = 0;
1185 towrite -= tocopy;
1186 data += tocopy;
1187 blk++;
1188 }
1189 out:
1190 if (len == towrite)
1191 return err;
1192 if (inode->i_size < off+len-towrite)
1193 i_size_write(inode, off+len-towrite);
1194 inode->i_version++;
1195 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
1196 mark_inode_dirty(inode);
1197 mutex_unlock(&inode->i_mutex);
1198 return len - towrite;
1199 }
1200
1201 #endif
1202
1203 static struct file_system_type ext2_fs_type = {
1204 .owner = THIS_MODULE,
1205 .name = "ext2",
1206 .get_sb = ext2_get_sb,
1207 .kill_sb = kill_block_super,
1208 .fs_flags = FS_REQUIRES_DEV,
1209 };
1210
1211 static int __init init_ext2_fs(void)
1212 {
1213 int err = init_ext2_xattr();
1214 if (err)
1215 return err;
1216 err = init_inodecache();
1217 if (err)
1218 goto out1;
1219 err = register_filesystem(&ext2_fs_type);
1220 if (err)
1221 goto out;
1222 return 0;
1223 out:
1224 destroy_inodecache();
1225 out1:
1226 exit_ext2_xattr();
1227 return err;
1228 }
1229
1230 static void __exit exit_ext2_fs(void)
1231 {
1232 unregister_filesystem(&ext2_fs_type);
1233 destroy_inodecache();
1234 exit_ext2_xattr();
1235 }
1236
1237 module_init(init_ext2_fs)
1238 module_exit(exit_ext2_fs)
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