2 * linux/fs/ext2/super.c
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)
11 * linux/fs/minix/inode.c
13 * Copyright (C) 1991, 1992 Linus Torvalds
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
19 #include <linux/module.h>
20 #include <linux/string.h>
22 #include <linux/slab.h>
23 #include <linux/init.h>
24 #include <linux/blkdev.h>
25 #include <linux/parser.h>
26 #include <linux/random.h>
27 #include <linux/buffer_head.h>
28 #include <linux/exportfs.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 <linux/log2.h>
34 #include <asm/uaccess.h>
40 static void ext2_sync_super(struct super_block
*sb
,
41 struct ext2_super_block
*es
);
42 static int ext2_remount (struct super_block
* sb
, int * flags
, char * data
);
43 static int ext2_statfs (struct dentry
* dentry
, struct kstatfs
* buf
);
45 void ext2_error (struct super_block
* sb
, const char * function
,
46 const char * fmt
, ...)
49 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
50 struct ext2_super_block
*es
= sbi
->s_es
;
52 if (!(sb
->s_flags
& MS_RDONLY
)) {
53 sbi
->s_mount_state
|= EXT2_ERROR_FS
;
55 cpu_to_le16(le16_to_cpu(es
->s_state
) | EXT2_ERROR_FS
);
56 ext2_sync_super(sb
, es
);
60 printk(KERN_CRIT
"EXT2-fs error (device %s): %s: ",sb
->s_id
, function
);
65 if (test_opt(sb
, ERRORS_PANIC
))
66 panic("EXT2-fs panic from previous error\n");
67 if (test_opt(sb
, ERRORS_RO
)) {
68 printk("Remounting filesystem read-only\n");
69 sb
->s_flags
|= MS_RDONLY
;
73 void ext2_warning (struct super_block
* sb
, const char * function
,
74 const char * fmt
, ...)
79 printk(KERN_WARNING
"EXT2-fs warning (device %s): %s: ",
86 void ext2_update_dynamic_rev(struct super_block
*sb
)
88 struct ext2_super_block
*es
= EXT2_SB(sb
)->s_es
;
90 if (le32_to_cpu(es
->s_rev_level
) > EXT2_GOOD_OLD_REV
)
93 ext2_warning(sb
, __FUNCTION__
,
94 "updating to rev %d because of new feature flag, "
95 "running e2fsck is recommended",
98 es
->s_first_ino
= cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO
);
99 es
->s_inode_size
= cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE
);
100 es
->s_rev_level
= cpu_to_le32(EXT2_DYNAMIC_REV
);
101 /* leave es->s_feature_*compat flags alone */
102 /* es->s_uuid will be set by e2fsck if empty */
105 * The rest of the superblock fields should be zero, and if not it
106 * means they are likely already in use, so leave them alone. We
107 * can leave it up to e2fsck to clean up any inconsistencies there.
111 static void ext2_put_super (struct super_block
* sb
)
115 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
117 ext2_xattr_put_super(sb
);
118 if (!(sb
->s_flags
& MS_RDONLY
)) {
119 struct ext2_super_block
*es
= sbi
->s_es
;
121 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
122 ext2_sync_super(sb
, es
);
124 db_count
= sbi
->s_gdb_count
;
125 for (i
= 0; i
< db_count
; i
++)
126 if (sbi
->s_group_desc
[i
])
127 brelse (sbi
->s_group_desc
[i
]);
128 kfree(sbi
->s_group_desc
);
130 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
131 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
132 percpu_counter_destroy(&sbi
->s_dirs_counter
);
134 sb
->s_fs_info
= NULL
;
140 static struct kmem_cache
* ext2_inode_cachep
;
142 static struct inode
*ext2_alloc_inode(struct super_block
*sb
)
144 struct ext2_inode_info
*ei
;
145 ei
= (struct ext2_inode_info
*)kmem_cache_alloc(ext2_inode_cachep
, GFP_KERNEL
);
148 #ifdef CONFIG_EXT2_FS_POSIX_ACL
149 ei
->i_acl
= EXT2_ACL_NOT_CACHED
;
150 ei
->i_default_acl
= EXT2_ACL_NOT_CACHED
;
152 ei
->vfs_inode
.i_version
= 1;
153 return &ei
->vfs_inode
;
156 static void ext2_destroy_inode(struct inode
*inode
)
158 kmem_cache_free(ext2_inode_cachep
, EXT2_I(inode
));
161 static void init_once(struct kmem_cache
* cachep
, void *foo
)
163 struct ext2_inode_info
*ei
= (struct ext2_inode_info
*) foo
;
165 rwlock_init(&ei
->i_meta_lock
);
166 #ifdef CONFIG_EXT2_FS_XATTR
167 init_rwsem(&ei
->xattr_sem
);
169 inode_init_once(&ei
->vfs_inode
);
172 static int init_inodecache(void)
174 ext2_inode_cachep
= kmem_cache_create("ext2_inode_cache",
175 sizeof(struct ext2_inode_info
),
176 0, (SLAB_RECLAIM_ACCOUNT
|
179 if (ext2_inode_cachep
== NULL
)
184 static void destroy_inodecache(void)
186 kmem_cache_destroy(ext2_inode_cachep
);
189 static void ext2_clear_inode(struct inode
*inode
)
191 #ifdef CONFIG_EXT2_FS_POSIX_ACL
192 struct ext2_inode_info
*ei
= EXT2_I(inode
);
194 if (ei
->i_acl
&& ei
->i_acl
!= EXT2_ACL_NOT_CACHED
) {
195 posix_acl_release(ei
->i_acl
);
196 ei
->i_acl
= EXT2_ACL_NOT_CACHED
;
198 if (ei
->i_default_acl
&& ei
->i_default_acl
!= EXT2_ACL_NOT_CACHED
) {
199 posix_acl_release(ei
->i_default_acl
);
200 ei
->i_default_acl
= EXT2_ACL_NOT_CACHED
;
205 static int ext2_show_options(struct seq_file
*seq
, struct vfsmount
*vfs
)
207 struct super_block
*sb
= vfs
->mnt_sb
;
208 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
209 struct ext2_super_block
*es
= sbi
->s_es
;
210 unsigned long def_mount_opts
;
212 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
214 if (sbi
->s_sb_block
!= 1)
215 seq_printf(seq
, ",sb=%lu", sbi
->s_sb_block
);
216 if (test_opt(sb
, MINIX_DF
))
217 seq_puts(seq
, ",minixdf");
218 if (test_opt(sb
, GRPID
))
219 seq_puts(seq
, ",grpid");
220 if (!test_opt(sb
, GRPID
) && (def_mount_opts
& EXT2_DEFM_BSDGROUPS
))
221 seq_puts(seq
, ",nogrpid");
222 if (sbi
->s_resuid
!= EXT2_DEF_RESUID
||
223 le16_to_cpu(es
->s_def_resuid
) != EXT2_DEF_RESUID
) {
224 seq_printf(seq
, ",resuid=%u", sbi
->s_resuid
);
226 if (sbi
->s_resgid
!= EXT2_DEF_RESGID
||
227 le16_to_cpu(es
->s_def_resgid
) != EXT2_DEF_RESGID
) {
228 seq_printf(seq
, ",resgid=%u", sbi
->s_resgid
);
230 if (test_opt(sb
, ERRORS_CONT
)) {
231 int def_errors
= le16_to_cpu(es
->s_errors
);
233 if (def_errors
== EXT2_ERRORS_PANIC
||
234 def_errors
== EXT2_ERRORS_RO
) {
235 seq_puts(seq
, ",errors=continue");
238 if (test_opt(sb
, ERRORS_RO
))
239 seq_puts(seq
, ",errors=remount-ro");
240 if (test_opt(sb
, ERRORS_PANIC
))
241 seq_puts(seq
, ",errors=panic");
242 if (test_opt(sb
, NO_UID32
))
243 seq_puts(seq
, ",nouid32");
244 if (test_opt(sb
, DEBUG
))
245 seq_puts(seq
, ",debug");
246 if (test_opt(sb
, OLDALLOC
))
247 seq_puts(seq
, ",oldalloc");
249 #ifdef CONFIG_EXT2_FS_XATTR
250 if (test_opt(sb
, XATTR_USER
))
251 seq_puts(seq
, ",user_xattr");
252 if (!test_opt(sb
, XATTR_USER
) &&
253 (def_mount_opts
& EXT2_DEFM_XATTR_USER
)) {
254 seq_puts(seq
, ",nouser_xattr");
258 #ifdef CONFIG_EXT2_FS_POSIX_ACL
259 if (test_opt(sb
, POSIX_ACL
))
260 seq_puts(seq
, ",acl");
261 if (!test_opt(sb
, POSIX_ACL
) && (def_mount_opts
& EXT2_DEFM_ACL
))
262 seq_puts(seq
, ",noacl");
265 if (test_opt(sb
, NOBH
))
266 seq_puts(seq
, ",nobh");
268 #if defined(CONFIG_QUOTA)
269 if (sbi
->s_mount_opt
& EXT2_MOUNT_USRQUOTA
)
270 seq_puts(seq
, ",usrquota");
272 if (sbi
->s_mount_opt
& EXT2_MOUNT_GRPQUOTA
)
273 seq_puts(seq
, ",grpquota");
276 #if defined(CONFIG_EXT2_FS_XIP)
277 if (sbi
->s_mount_opt
& EXT2_MOUNT_XIP
)
278 seq_puts(seq
, ",xip");
285 static ssize_t
ext2_quota_read(struct super_block
*sb
, int type
, char *data
, size_t len
, loff_t off
);
286 static ssize_t
ext2_quota_write(struct super_block
*sb
, int type
, const char *data
, size_t len
, loff_t off
);
289 static const struct super_operations ext2_sops
= {
290 .alloc_inode
= ext2_alloc_inode
,
291 .destroy_inode
= ext2_destroy_inode
,
292 .read_inode
= ext2_read_inode
,
293 .write_inode
= ext2_write_inode
,
294 .put_inode
= ext2_put_inode
,
295 .delete_inode
= ext2_delete_inode
,
296 .put_super
= ext2_put_super
,
297 .write_super
= ext2_write_super
,
298 .statfs
= ext2_statfs
,
299 .remount_fs
= ext2_remount
,
300 .clear_inode
= ext2_clear_inode
,
301 .show_options
= ext2_show_options
,
303 .quota_read
= ext2_quota_read
,
304 .quota_write
= ext2_quota_write
,
308 static struct dentry
*ext2_get_dentry(struct super_block
*sb
, void *vobjp
)
311 unsigned long ino
= objp
[0];
312 __u32 generation
= objp
[1];
314 struct dentry
*result
;
316 if (ino
< EXT2_FIRST_INO(sb
) && ino
!= EXT2_ROOT_INO
)
317 return ERR_PTR(-ESTALE
);
318 if (ino
> le32_to_cpu(EXT2_SB(sb
)->s_es
->s_inodes_count
))
319 return ERR_PTR(-ESTALE
);
321 /* iget isn't really right if the inode is currently unallocated!!
322 * ext2_read_inode currently does appropriate checks, but
323 * it might be "neater" to call ext2_get_inode first and check
324 * if the inode is valid.....
326 inode
= iget(sb
, ino
);
328 return ERR_PTR(-ENOMEM
);
329 if (is_bad_inode(inode
) ||
330 (generation
&& inode
->i_generation
!= generation
)) {
331 /* we didn't find the right inode.. */
333 return ERR_PTR(-ESTALE
);
335 /* now to find a dentry.
336 * If possible, get a well-connected one
338 result
= d_alloc_anon(inode
);
341 return ERR_PTR(-ENOMEM
);
346 /* Yes, most of these are left as NULL!!
347 * A NULL value implies the default, which works with ext2-like file
348 * systems, but can be improved upon.
349 * Currently only get_parent is required.
351 static struct export_operations ext2_export_ops
= {
352 .get_parent
= ext2_get_parent
,
353 .get_dentry
= ext2_get_dentry
,
356 static unsigned long get_sb_block(void **data
)
358 unsigned long sb_block
;
359 char *options
= (char *) *data
;
361 if (!options
|| strncmp(options
, "sb=", 3) != 0)
362 return 1; /* Default location */
364 sb_block
= simple_strtoul(options
, &options
, 0);
365 if (*options
&& *options
!= ',') {
366 printk("EXT2-fs: Invalid sb specification: %s\n",
372 *data
= (void *) options
;
377 Opt_bsd_df
, Opt_minix_df
, Opt_grpid
, Opt_nogrpid
,
378 Opt_resgid
, Opt_resuid
, Opt_sb
, Opt_err_cont
, Opt_err_panic
,
379 Opt_err_ro
, Opt_nouid32
, Opt_nocheck
, Opt_debug
,
380 Opt_oldalloc
, Opt_orlov
, Opt_nobh
, Opt_user_xattr
, Opt_nouser_xattr
,
381 Opt_acl
, Opt_noacl
, Opt_xip
, Opt_ignore
, Opt_err
, Opt_quota
,
382 Opt_usrquota
, Opt_grpquota
385 static match_table_t tokens
= {
386 {Opt_bsd_df
, "bsddf"},
387 {Opt_minix_df
, "minixdf"},
388 {Opt_grpid
, "grpid"},
389 {Opt_grpid
, "bsdgroups"},
390 {Opt_nogrpid
, "nogrpid"},
391 {Opt_nogrpid
, "sysvgroups"},
392 {Opt_resgid
, "resgid=%u"},
393 {Opt_resuid
, "resuid=%u"},
395 {Opt_err_cont
, "errors=continue"},
396 {Opt_err_panic
, "errors=panic"},
397 {Opt_err_ro
, "errors=remount-ro"},
398 {Opt_nouid32
, "nouid32"},
399 {Opt_nocheck
, "check=none"},
400 {Opt_nocheck
, "nocheck"},
401 {Opt_debug
, "debug"},
402 {Opt_oldalloc
, "oldalloc"},
403 {Opt_orlov
, "orlov"},
405 {Opt_user_xattr
, "user_xattr"},
406 {Opt_nouser_xattr
, "nouser_xattr"},
408 {Opt_noacl
, "noacl"},
410 {Opt_grpquota
, "grpquota"},
411 {Opt_ignore
, "noquota"},
412 {Opt_quota
, "quota"},
413 {Opt_usrquota
, "usrquota"},
417 static int parse_options (char * options
,
418 struct ext2_sb_info
*sbi
)
421 substring_t args
[MAX_OPT_ARGS
];
427 while ((p
= strsep (&options
, ",")) != NULL
) {
432 token
= match_token(p
, tokens
, args
);
435 clear_opt (sbi
->s_mount_opt
, MINIX_DF
);
438 set_opt (sbi
->s_mount_opt
, MINIX_DF
);
441 set_opt (sbi
->s_mount_opt
, GRPID
);
444 clear_opt (sbi
->s_mount_opt
, GRPID
);
447 if (match_int(&args
[0], &option
))
449 sbi
->s_resuid
= option
;
452 if (match_int(&args
[0], &option
))
454 sbi
->s_resgid
= option
;
457 /* handled by get_sb_block() instead of here */
458 /* *sb_block = match_int(&args[0]); */
461 clear_opt (sbi
->s_mount_opt
, ERRORS_CONT
);
462 clear_opt (sbi
->s_mount_opt
, ERRORS_RO
);
463 set_opt (sbi
->s_mount_opt
, ERRORS_PANIC
);
466 clear_opt (sbi
->s_mount_opt
, ERRORS_CONT
);
467 clear_opt (sbi
->s_mount_opt
, ERRORS_PANIC
);
468 set_opt (sbi
->s_mount_opt
, ERRORS_RO
);
471 clear_opt (sbi
->s_mount_opt
, ERRORS_RO
);
472 clear_opt (sbi
->s_mount_opt
, ERRORS_PANIC
);
473 set_opt (sbi
->s_mount_opt
, ERRORS_CONT
);
476 set_opt (sbi
->s_mount_opt
, NO_UID32
);
479 clear_opt (sbi
->s_mount_opt
, CHECK
);
482 set_opt (sbi
->s_mount_opt
, DEBUG
);
485 set_opt (sbi
->s_mount_opt
, OLDALLOC
);
488 clear_opt (sbi
->s_mount_opt
, OLDALLOC
);
491 set_opt (sbi
->s_mount_opt
, NOBH
);
493 #ifdef CONFIG_EXT2_FS_XATTR
495 set_opt (sbi
->s_mount_opt
, XATTR_USER
);
497 case Opt_nouser_xattr
:
498 clear_opt (sbi
->s_mount_opt
, XATTR_USER
);
502 case Opt_nouser_xattr
:
503 printk("EXT2 (no)user_xattr options not supported\n");
506 #ifdef CONFIG_EXT2_FS_POSIX_ACL
508 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
511 clear_opt(sbi
->s_mount_opt
, POSIX_ACL
);
516 printk("EXT2 (no)acl options not supported\n");
520 #ifdef CONFIG_EXT2_FS_XIP
521 set_opt (sbi
->s_mount_opt
, XIP
);
523 printk("EXT2 xip option not supported\n");
527 #if defined(CONFIG_QUOTA)
530 set_opt(sbi
->s_mount_opt
, USRQUOTA
);
534 set_opt(sbi
->s_mount_opt
, GRPQUOTA
);
541 "EXT2-fs: quota operations not supported.\n");
555 static int ext2_setup_super (struct super_block
* sb
,
556 struct ext2_super_block
* es
,
560 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
562 if (le32_to_cpu(es
->s_rev_level
) > EXT2_MAX_SUPP_REV
) {
563 printk ("EXT2-fs warning: revision level too high, "
564 "forcing read-only mode\n");
569 if (!(sbi
->s_mount_state
& EXT2_VALID_FS
))
570 printk ("EXT2-fs warning: mounting unchecked fs, "
571 "running e2fsck is recommended\n");
572 else if ((sbi
->s_mount_state
& EXT2_ERROR_FS
))
573 printk ("EXT2-fs warning: mounting fs with errors, "
574 "running e2fsck is recommended\n");
575 else if ((__s16
) le16_to_cpu(es
->s_max_mnt_count
) >= 0 &&
576 le16_to_cpu(es
->s_mnt_count
) >=
577 (unsigned short) (__s16
) le16_to_cpu(es
->s_max_mnt_count
))
578 printk ("EXT2-fs warning: maximal mount count reached, "
579 "running e2fsck is recommended\n");
580 else if (le32_to_cpu(es
->s_checkinterval
) &&
581 (le32_to_cpu(es
->s_lastcheck
) + le32_to_cpu(es
->s_checkinterval
) <= get_seconds()))
582 printk ("EXT2-fs warning: checktime reached, "
583 "running e2fsck is recommended\n");
584 if (!le16_to_cpu(es
->s_max_mnt_count
))
585 es
->s_max_mnt_count
= cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT
);
586 es
->s_mnt_count
=cpu_to_le16(le16_to_cpu(es
->s_mnt_count
) + 1);
587 ext2_write_super(sb
);
588 if (test_opt (sb
, DEBUG
))
589 printk ("[EXT II FS %s, %s, bs=%lu, fs=%lu, gc=%lu, "
590 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
591 EXT2FS_VERSION
, EXT2FS_DATE
, sb
->s_blocksize
,
594 EXT2_BLOCKS_PER_GROUP(sb
),
595 EXT2_INODES_PER_GROUP(sb
),
600 static int ext2_check_descriptors (struct super_block
* sb
)
604 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
605 unsigned long first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
);
606 unsigned long last_block
;
607 struct ext2_group_desc
* gdp
= NULL
;
609 ext2_debug ("Checking group descriptors");
611 for (i
= 0; i
< sbi
->s_groups_count
; i
++)
613 if (i
== sbi
->s_groups_count
- 1)
614 last_block
= le32_to_cpu(sbi
->s_es
->s_blocks_count
) - 1;
616 last_block
= first_block
+
617 (EXT2_BLOCKS_PER_GROUP(sb
) - 1);
619 if ((i
% EXT2_DESC_PER_BLOCK(sb
)) == 0)
620 gdp
= (struct ext2_group_desc
*) sbi
->s_group_desc
[desc_block
++]->b_data
;
621 if (le32_to_cpu(gdp
->bg_block_bitmap
) < first_block
||
622 le32_to_cpu(gdp
->bg_block_bitmap
) > last_block
)
624 ext2_error (sb
, "ext2_check_descriptors",
625 "Block bitmap for group %d"
626 " not in group (block %lu)!",
627 i
, (unsigned long) le32_to_cpu(gdp
->bg_block_bitmap
));
630 if (le32_to_cpu(gdp
->bg_inode_bitmap
) < first_block
||
631 le32_to_cpu(gdp
->bg_inode_bitmap
) > last_block
)
633 ext2_error (sb
, "ext2_check_descriptors",
634 "Inode bitmap for group %d"
635 " not in group (block %lu)!",
636 i
, (unsigned long) le32_to_cpu(gdp
->bg_inode_bitmap
));
639 if (le32_to_cpu(gdp
->bg_inode_table
) < first_block
||
640 le32_to_cpu(gdp
->bg_inode_table
) + sbi
->s_itb_per_group
- 1 >
643 ext2_error (sb
, "ext2_check_descriptors",
644 "Inode table for group %d"
645 " not in group (block %lu)!",
646 i
, (unsigned long) le32_to_cpu(gdp
->bg_inode_table
));
649 first_block
+= EXT2_BLOCKS_PER_GROUP(sb
);
656 * Maximal file size. There is a direct, and {,double-,triple-}indirect
657 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
658 * We need to be 1 filesystem block less than the 2^32 sector limit.
660 static loff_t
ext2_max_size(int bits
)
662 loff_t res
= EXT2_NDIR_BLOCKS
;
663 /* This constant is calculated to be the largest file size for a
664 * dense, 4k-blocksize file such that the total number of
665 * sectors in the file, including data and all indirect blocks,
666 * does not exceed 2^32. */
667 const loff_t upper_limit
= 0x1ff7fffd000LL
;
669 res
+= 1LL << (bits
-2);
670 res
+= 1LL << (2*(bits
-2));
671 res
+= 1LL << (3*(bits
-2));
673 if (res
> upper_limit
)
678 static unsigned long descriptor_loc(struct super_block
*sb
,
679 unsigned long logic_sb_block
,
682 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
683 unsigned long bg
, first_data_block
, first_meta_bg
;
686 first_data_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
);
687 first_meta_bg
= le32_to_cpu(sbi
->s_es
->s_first_meta_bg
);
689 if (!EXT2_HAS_INCOMPAT_FEATURE(sb
, EXT2_FEATURE_INCOMPAT_META_BG
) ||
691 return (logic_sb_block
+ nr
+ 1);
692 bg
= sbi
->s_desc_per_block
* nr
;
693 if (ext2_bg_has_super(sb
, bg
))
695 return (first_data_block
+ has_super
+ (bg
* sbi
->s_blocks_per_group
));
698 static int ext2_fill_super(struct super_block
*sb
, void *data
, int silent
)
700 struct buffer_head
* bh
;
701 struct ext2_sb_info
* sbi
;
702 struct ext2_super_block
* es
;
705 unsigned long sb_block
= get_sb_block(&data
);
706 unsigned long logic_sb_block
;
707 unsigned long offset
= 0;
708 unsigned long def_mount_opts
;
709 int blocksize
= BLOCK_SIZE
;
715 sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
719 sbi
->s_sb_block
= sb_block
;
722 * See what the current blocksize for the device is, and
723 * use that as the blocksize. Otherwise (or if the blocksize
724 * is smaller than the default) use the default.
725 * This is important for devices that have a hardware
726 * sectorsize that is larger than the default.
728 blocksize
= sb_min_blocksize(sb
, BLOCK_SIZE
);
730 printk ("EXT2-fs: unable to set blocksize\n");
735 * If the superblock doesn't start on a hardware sector boundary,
736 * calculate the offset.
738 if (blocksize
!= BLOCK_SIZE
) {
739 logic_sb_block
= (sb_block
*BLOCK_SIZE
) / blocksize
;
740 offset
= (sb_block
*BLOCK_SIZE
) % blocksize
;
742 logic_sb_block
= sb_block
;
745 if (!(bh
= sb_bread(sb
, logic_sb_block
))) {
746 printk ("EXT2-fs: unable to read superblock\n");
750 * Note: s_es must be initialized as soon as possible because
751 * some ext2 macro-instructions depend on its value
753 es
= (struct ext2_super_block
*) (((char *)bh
->b_data
) + offset
);
755 sb
->s_magic
= le16_to_cpu(es
->s_magic
);
757 if (sb
->s_magic
!= EXT2_SUPER_MAGIC
)
760 /* Set defaults before we parse the mount options */
761 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
762 if (def_mount_opts
& EXT2_DEFM_DEBUG
)
763 set_opt(sbi
->s_mount_opt
, DEBUG
);
764 if (def_mount_opts
& EXT2_DEFM_BSDGROUPS
)
765 set_opt(sbi
->s_mount_opt
, GRPID
);
766 if (def_mount_opts
& EXT2_DEFM_UID16
)
767 set_opt(sbi
->s_mount_opt
, NO_UID32
);
768 #ifdef CONFIG_EXT2_FS_XATTR
769 if (def_mount_opts
& EXT2_DEFM_XATTR_USER
)
770 set_opt(sbi
->s_mount_opt
, XATTR_USER
);
772 #ifdef CONFIG_EXT2_FS_POSIX_ACL
773 if (def_mount_opts
& EXT2_DEFM_ACL
)
774 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
777 if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT2_ERRORS_PANIC
)
778 set_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
779 else if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT2_ERRORS_RO
)
780 set_opt(sbi
->s_mount_opt
, ERRORS_RO
);
782 set_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
784 sbi
->s_resuid
= le16_to_cpu(es
->s_def_resuid
);
785 sbi
->s_resgid
= le16_to_cpu(es
->s_def_resgid
);
787 if (!parse_options ((char *) data
, sbi
))
790 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
791 ((EXT2_SB(sb
)->s_mount_opt
& EXT2_MOUNT_POSIX_ACL
) ?
794 ext2_xip_verify_sb(sb
); /* see if bdev supports xip, unset
795 EXT2_MOUNT_XIP if not */
797 if (le32_to_cpu(es
->s_rev_level
) == EXT2_GOOD_OLD_REV
&&
798 (EXT2_HAS_COMPAT_FEATURE(sb
, ~0U) ||
799 EXT2_HAS_RO_COMPAT_FEATURE(sb
, ~0U) ||
800 EXT2_HAS_INCOMPAT_FEATURE(sb
, ~0U)))
801 printk("EXT2-fs warning: feature flags set on rev 0 fs, "
802 "running e2fsck is recommended\n");
804 * Check feature flags regardless of the revision level, since we
805 * previously didn't change the revision level when setting the flags,
806 * so there is a chance incompat flags are set on a rev 0 filesystem.
808 features
= EXT2_HAS_INCOMPAT_FEATURE(sb
, ~EXT2_FEATURE_INCOMPAT_SUPP
);
810 printk("EXT2-fs: %s: couldn't mount because of "
811 "unsupported optional features (%x).\n",
812 sb
->s_id
, le32_to_cpu(features
));
815 if (!(sb
->s_flags
& MS_RDONLY
) &&
816 (features
= EXT2_HAS_RO_COMPAT_FEATURE(sb
, ~EXT2_FEATURE_RO_COMPAT_SUPP
))){
817 printk("EXT2-fs: %s: couldn't mount RDWR because of "
818 "unsupported optional features (%x).\n",
819 sb
->s_id
, le32_to_cpu(features
));
823 blocksize
= BLOCK_SIZE
<< le32_to_cpu(sbi
->s_es
->s_log_block_size
);
825 if ((ext2_use_xip(sb
)) && ((blocksize
!= PAGE_SIZE
) ||
826 (sb
->s_blocksize
!= blocksize
))) {
828 printk("XIP: Unsupported blocksize\n");
832 /* If the blocksize doesn't match, re-read the thing.. */
833 if (sb
->s_blocksize
!= blocksize
) {
836 if (!sb_set_blocksize(sb
, blocksize
)) {
837 printk(KERN_ERR
"EXT2-fs: blocksize too small for device.\n");
841 logic_sb_block
= (sb_block
*BLOCK_SIZE
) / blocksize
;
842 offset
= (sb_block
*BLOCK_SIZE
) % blocksize
;
843 bh
= sb_bread(sb
, logic_sb_block
);
845 printk("EXT2-fs: Couldn't read superblock on "
849 es
= (struct ext2_super_block
*) (((char *)bh
->b_data
) + offset
);
851 if (es
->s_magic
!= cpu_to_le16(EXT2_SUPER_MAGIC
)) {
852 printk ("EXT2-fs: Magic mismatch, very weird !\n");
857 sb
->s_maxbytes
= ext2_max_size(sb
->s_blocksize_bits
);
859 if (le32_to_cpu(es
->s_rev_level
) == EXT2_GOOD_OLD_REV
) {
860 sbi
->s_inode_size
= EXT2_GOOD_OLD_INODE_SIZE
;
861 sbi
->s_first_ino
= EXT2_GOOD_OLD_FIRST_INO
;
863 sbi
->s_inode_size
= le16_to_cpu(es
->s_inode_size
);
864 sbi
->s_first_ino
= le32_to_cpu(es
->s_first_ino
);
865 if ((sbi
->s_inode_size
< EXT2_GOOD_OLD_INODE_SIZE
) ||
866 !is_power_of_2(sbi
->s_inode_size
) ||
867 (sbi
->s_inode_size
> blocksize
)) {
868 printk ("EXT2-fs: unsupported inode size: %d\n",
874 sbi
->s_frag_size
= EXT2_MIN_FRAG_SIZE
<<
875 le32_to_cpu(es
->s_log_frag_size
);
876 if (sbi
->s_frag_size
== 0)
878 sbi
->s_frags_per_block
= sb
->s_blocksize
/ sbi
->s_frag_size
;
880 sbi
->s_blocks_per_group
= le32_to_cpu(es
->s_blocks_per_group
);
881 sbi
->s_frags_per_group
= le32_to_cpu(es
->s_frags_per_group
);
882 sbi
->s_inodes_per_group
= le32_to_cpu(es
->s_inodes_per_group
);
884 if (EXT2_INODE_SIZE(sb
) == 0)
886 sbi
->s_inodes_per_block
= sb
->s_blocksize
/ EXT2_INODE_SIZE(sb
);
887 if (sbi
->s_inodes_per_block
== 0 || sbi
->s_inodes_per_group
== 0)
889 sbi
->s_itb_per_group
= sbi
->s_inodes_per_group
/
890 sbi
->s_inodes_per_block
;
891 sbi
->s_desc_per_block
= sb
->s_blocksize
/
892 sizeof (struct ext2_group_desc
);
894 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
895 sbi
->s_addr_per_block_bits
=
896 ilog2 (EXT2_ADDR_PER_BLOCK(sb
));
897 sbi
->s_desc_per_block_bits
=
898 ilog2 (EXT2_DESC_PER_BLOCK(sb
));
900 if (sb
->s_magic
!= EXT2_SUPER_MAGIC
)
903 if (sb
->s_blocksize
!= bh
->b_size
) {
905 printk ("VFS: Unsupported blocksize on dev "
910 if (sb
->s_blocksize
!= sbi
->s_frag_size
) {
911 printk ("EXT2-fs: fragsize %lu != blocksize %lu (not supported yet)\n",
912 sbi
->s_frag_size
, sb
->s_blocksize
);
916 if (sbi
->s_blocks_per_group
> sb
->s_blocksize
* 8) {
917 printk ("EXT2-fs: #blocks per group too big: %lu\n",
918 sbi
->s_blocks_per_group
);
921 if (sbi
->s_frags_per_group
> sb
->s_blocksize
* 8) {
922 printk ("EXT2-fs: #fragments per group too big: %lu\n",
923 sbi
->s_frags_per_group
);
926 if (sbi
->s_inodes_per_group
> sb
->s_blocksize
* 8) {
927 printk ("EXT2-fs: #inodes per group too big: %lu\n",
928 sbi
->s_inodes_per_group
);
932 if (EXT2_BLOCKS_PER_GROUP(sb
) == 0)
934 sbi
->s_groups_count
= ((le32_to_cpu(es
->s_blocks_count
) -
935 le32_to_cpu(es
->s_first_data_block
) - 1)
936 / EXT2_BLOCKS_PER_GROUP(sb
)) + 1;
937 db_count
= (sbi
->s_groups_count
+ EXT2_DESC_PER_BLOCK(sb
) - 1) /
938 EXT2_DESC_PER_BLOCK(sb
);
939 sbi
->s_group_desc
= kmalloc (db_count
* sizeof (struct buffer_head
*), GFP_KERNEL
);
940 if (sbi
->s_group_desc
== NULL
) {
941 printk ("EXT2-fs: not enough memory\n");
944 bgl_lock_init(&sbi
->s_blockgroup_lock
);
945 sbi
->s_debts
= kcalloc(sbi
->s_groups_count
, sizeof(*sbi
->s_debts
), GFP_KERNEL
);
947 printk ("EXT2-fs: not enough memory\n");
948 goto failed_mount_group_desc
;
950 for (i
= 0; i
< db_count
; i
++) {
951 block
= descriptor_loc(sb
, logic_sb_block
, i
);
952 sbi
->s_group_desc
[i
] = sb_bread(sb
, block
);
953 if (!sbi
->s_group_desc
[i
]) {
954 for (j
= 0; j
< i
; j
++)
955 brelse (sbi
->s_group_desc
[j
]);
956 printk ("EXT2-fs: unable to read group descriptors\n");
957 goto failed_mount_group_desc
;
960 if (!ext2_check_descriptors (sb
)) {
961 printk ("EXT2-fs: group descriptors corrupted!\n");
964 sbi
->s_gdb_count
= db_count
;
965 get_random_bytes(&sbi
->s_next_generation
, sizeof(u32
));
966 spin_lock_init(&sbi
->s_next_gen_lock
);
968 err
= percpu_counter_init(&sbi
->s_freeblocks_counter
,
969 ext2_count_free_blocks(sb
));
971 err
= percpu_counter_init(&sbi
->s_freeinodes_counter
,
972 ext2_count_free_inodes(sb
));
975 err
= percpu_counter_init(&sbi
->s_dirs_counter
,
976 ext2_count_dirs(sb
));
979 printk(KERN_ERR
"EXT2-fs: insufficient memory\n");
983 * set up enough so that it can read an inode
985 sb
->s_op
= &ext2_sops
;
986 sb
->s_export_op
= &ext2_export_ops
;
987 sb
->s_xattr
= ext2_xattr_handlers
;
988 root
= iget(sb
, EXT2_ROOT_INO
);
989 sb
->s_root
= d_alloc_root(root
);
992 printk(KERN_ERR
"EXT2-fs: get root inode failed\n");
995 if (!S_ISDIR(root
->i_mode
) || !root
->i_blocks
|| !root
->i_size
) {
998 printk(KERN_ERR
"EXT2-fs: corrupt root inode, run e2fsck\n");
1001 if (EXT2_HAS_COMPAT_FEATURE(sb
, EXT3_FEATURE_COMPAT_HAS_JOURNAL
))
1002 ext2_warning(sb
, __FUNCTION__
,
1003 "mounting ext3 filesystem as ext2");
1004 ext2_setup_super (sb
, es
, sb
->s_flags
& MS_RDONLY
);
1009 printk("VFS: Can't find an ext2 filesystem on dev %s.\n",
1013 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
1014 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
1015 percpu_counter_destroy(&sbi
->s_dirs_counter
);
1017 for (i
= 0; i
< db_count
; i
++)
1018 brelse(sbi
->s_group_desc
[i
]);
1019 failed_mount_group_desc
:
1020 kfree(sbi
->s_group_desc
);
1021 kfree(sbi
->s_debts
);
1025 sb
->s_fs_info
= NULL
;
1030 static void ext2_commit_super (struct super_block
* sb
,
1031 struct ext2_super_block
* es
)
1033 es
->s_wtime
= cpu_to_le32(get_seconds());
1034 mark_buffer_dirty(EXT2_SB(sb
)->s_sbh
);
1038 static void ext2_sync_super(struct super_block
*sb
, struct ext2_super_block
*es
)
1040 es
->s_free_blocks_count
= cpu_to_le32(ext2_count_free_blocks(sb
));
1041 es
->s_free_inodes_count
= cpu_to_le32(ext2_count_free_inodes(sb
));
1042 es
->s_wtime
= cpu_to_le32(get_seconds());
1043 mark_buffer_dirty(EXT2_SB(sb
)->s_sbh
);
1044 sync_dirty_buffer(EXT2_SB(sb
)->s_sbh
);
1049 * In the second extended file system, it is not necessary to
1050 * write the super block since we use a mapping of the
1051 * disk super block in a buffer.
1053 * However, this function is still used to set the fs valid
1054 * flags to 0. We need to set this flag to 0 since the fs
1055 * may have been checked while mounted and e2fsck may have
1056 * set s_state to EXT2_VALID_FS after some corrections.
1059 void ext2_write_super (struct super_block
* sb
)
1061 struct ext2_super_block
* es
;
1063 if (!(sb
->s_flags
& MS_RDONLY
)) {
1064 es
= EXT2_SB(sb
)->s_es
;
1066 if (le16_to_cpu(es
->s_state
) & EXT2_VALID_FS
) {
1067 ext2_debug ("setting valid to 0\n");
1068 es
->s_state
= cpu_to_le16(le16_to_cpu(es
->s_state
) &
1070 es
->s_free_blocks_count
= cpu_to_le32(ext2_count_free_blocks(sb
));
1071 es
->s_free_inodes_count
= cpu_to_le32(ext2_count_free_inodes(sb
));
1072 es
->s_mtime
= cpu_to_le32(get_seconds());
1073 ext2_sync_super(sb
, es
);
1075 ext2_commit_super (sb
, es
);
1081 static int ext2_remount (struct super_block
* sb
, int * flags
, char * data
)
1083 struct ext2_sb_info
* sbi
= EXT2_SB(sb
);
1084 struct ext2_super_block
* es
;
1085 unsigned long old_mount_opt
= sbi
->s_mount_opt
;
1086 struct ext2_mount_options old_opts
;
1087 unsigned long old_sb_flags
;
1090 /* Store the old options */
1091 old_sb_flags
= sb
->s_flags
;
1092 old_opts
.s_mount_opt
= sbi
->s_mount_opt
;
1093 old_opts
.s_resuid
= sbi
->s_resuid
;
1094 old_opts
.s_resgid
= sbi
->s_resgid
;
1097 * Allow the "check" option to be passed as a remount option.
1099 if (!parse_options (data
, sbi
)) {
1104 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
1105 ((sbi
->s_mount_opt
& EXT2_MOUNT_POSIX_ACL
) ? MS_POSIXACL
: 0);
1107 ext2_xip_verify_sb(sb
); /* see if bdev supports xip, unset
1108 EXT2_MOUNT_XIP if not */
1110 if ((ext2_use_xip(sb
)) && (sb
->s_blocksize
!= PAGE_SIZE
)) {
1111 printk("XIP: Unsupported blocksize\n");
1117 if (((sbi
->s_mount_opt
& EXT2_MOUNT_XIP
) !=
1118 (old_mount_opt
& EXT2_MOUNT_XIP
)) &&
1119 invalidate_inodes(sb
))
1120 ext2_warning(sb
, __FUNCTION__
, "busy inodes while remounting "\
1121 "xip remain in cache (no functional problem)");
1122 if ((*flags
& MS_RDONLY
) == (sb
->s_flags
& MS_RDONLY
))
1124 if (*flags
& MS_RDONLY
) {
1125 if (le16_to_cpu(es
->s_state
) & EXT2_VALID_FS
||
1126 !(sbi
->s_mount_state
& EXT2_VALID_FS
))
1129 * OK, we are remounting a valid rw partition rdonly, so set
1130 * the rdonly flag and then mark the partition as valid again.
1132 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
1133 es
->s_mtime
= cpu_to_le32(get_seconds());
1135 __le32 ret
= EXT2_HAS_RO_COMPAT_FEATURE(sb
,
1136 ~EXT2_FEATURE_RO_COMPAT_SUPP
);
1138 printk("EXT2-fs: %s: couldn't remount RDWR because of "
1139 "unsupported optional features (%x).\n",
1140 sb
->s_id
, le32_to_cpu(ret
));
1145 * Mounting a RDONLY partition read-write, so reread and
1146 * store the current valid flag. (It may have been changed
1147 * by e2fsck since we originally mounted the partition.)
1149 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
1150 if (!ext2_setup_super (sb
, es
, 0))
1151 sb
->s_flags
&= ~MS_RDONLY
;
1153 ext2_sync_super(sb
, es
);
1156 sbi
->s_mount_opt
= old_opts
.s_mount_opt
;
1157 sbi
->s_resuid
= old_opts
.s_resuid
;
1158 sbi
->s_resgid
= old_opts
.s_resgid
;
1159 sb
->s_flags
= old_sb_flags
;
1163 static int ext2_statfs (struct dentry
* dentry
, struct kstatfs
* buf
)
1165 struct super_block
*sb
= dentry
->d_sb
;
1166 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
1167 struct ext2_super_block
*es
= sbi
->s_es
;
1170 if (test_opt (sb
, MINIX_DF
))
1171 sbi
->s_overhead_last
= 0;
1172 else if (sbi
->s_blocks_last
!= le32_to_cpu(es
->s_blocks_count
)) {
1173 unsigned long i
, overhead
= 0;
1177 * Compute the overhead (FS structures). This is constant
1178 * for a given filesystem unless the number of block groups
1179 * changes so we cache the previous value until it does.
1183 * All of the blocks before first_data_block are
1186 overhead
= le32_to_cpu(es
->s_first_data_block
);
1189 * Add the overhead attributed to the superblock and
1190 * block group descriptors. If the sparse superblocks
1191 * feature is turned on, then not all groups have this.
1193 for (i
= 0; i
< sbi
->s_groups_count
; i
++)
1194 overhead
+= ext2_bg_has_super(sb
, i
) +
1195 ext2_bg_num_gdb(sb
, i
);
1198 * Every block group has an inode bitmap, a block
1199 * bitmap, and an inode table.
1201 overhead
+= (sbi
->s_groups_count
*
1202 (2 + sbi
->s_itb_per_group
));
1203 sbi
->s_overhead_last
= overhead
;
1205 sbi
->s_blocks_last
= le32_to_cpu(es
->s_blocks_count
);
1208 buf
->f_type
= EXT2_SUPER_MAGIC
;
1209 buf
->f_bsize
= sb
->s_blocksize
;
1210 buf
->f_blocks
= le32_to_cpu(es
->s_blocks_count
) - sbi
->s_overhead_last
;
1211 buf
->f_bfree
= ext2_count_free_blocks(sb
);
1212 es
->s_free_blocks_count
= cpu_to_le32(buf
->f_bfree
);
1213 buf
->f_bavail
= buf
->f_bfree
- le32_to_cpu(es
->s_r_blocks_count
);
1214 if (buf
->f_bfree
< le32_to_cpu(es
->s_r_blocks_count
))
1216 buf
->f_files
= le32_to_cpu(es
->s_inodes_count
);
1217 buf
->f_ffree
= ext2_count_free_inodes(sb
);
1218 es
->s_free_inodes_count
= cpu_to_le32(buf
->f_ffree
);
1219 buf
->f_namelen
= EXT2_NAME_LEN
;
1220 fsid
= le64_to_cpup((void *)es
->s_uuid
) ^
1221 le64_to_cpup((void *)es
->s_uuid
+ sizeof(u64
));
1222 buf
->f_fsid
.val
[0] = fsid
& 0xFFFFFFFFUL
;
1223 buf
->f_fsid
.val
[1] = (fsid
>> 32) & 0xFFFFFFFFUL
;
1227 static int ext2_get_sb(struct file_system_type
*fs_type
,
1228 int flags
, const char *dev_name
, void *data
, struct vfsmount
*mnt
)
1230 return get_sb_bdev(fs_type
, flags
, dev_name
, data
, ext2_fill_super
, mnt
);
1235 /* Read data from quotafile - avoid pagecache and such because we cannot afford
1236 * acquiring the locks... As quota files are never truncated and quota code
1237 * itself serializes the operations (and noone else should touch the files)
1238 * we don't have to be afraid of races */
1239 static ssize_t
ext2_quota_read(struct super_block
*sb
, int type
, char *data
,
1240 size_t len
, loff_t off
)
1242 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
1243 sector_t blk
= off
>> EXT2_BLOCK_SIZE_BITS(sb
);
1245 int offset
= off
& (sb
->s_blocksize
- 1);
1248 struct buffer_head tmp_bh
;
1249 struct buffer_head
*bh
;
1250 loff_t i_size
= i_size_read(inode
);
1254 if (off
+len
> i_size
)
1257 while (toread
> 0) {
1258 tocopy
= sb
->s_blocksize
- offset
< toread
?
1259 sb
->s_blocksize
- offset
: toread
;
1262 err
= ext2_get_block(inode
, blk
, &tmp_bh
, 0);
1265 if (!buffer_mapped(&tmp_bh
)) /* A hole? */
1266 memset(data
, 0, tocopy
);
1268 bh
= sb_bread(sb
, tmp_bh
.b_blocknr
);
1271 memcpy(data
, bh
->b_data
+offset
, tocopy
);
1282 /* Write to quotafile */
1283 static ssize_t
ext2_quota_write(struct super_block
*sb
, int type
,
1284 const char *data
, size_t len
, loff_t off
)
1286 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
1287 sector_t blk
= off
>> EXT2_BLOCK_SIZE_BITS(sb
);
1289 int offset
= off
& (sb
->s_blocksize
- 1);
1291 size_t towrite
= len
;
1292 struct buffer_head tmp_bh
;
1293 struct buffer_head
*bh
;
1295 mutex_lock_nested(&inode
->i_mutex
, I_MUTEX_QUOTA
);
1296 while (towrite
> 0) {
1297 tocopy
= sb
->s_blocksize
- offset
< towrite
?
1298 sb
->s_blocksize
- offset
: towrite
;
1301 err
= ext2_get_block(inode
, blk
, &tmp_bh
, 1);
1304 if (offset
|| tocopy
!= EXT2_BLOCK_SIZE(sb
))
1305 bh
= sb_bread(sb
, tmp_bh
.b_blocknr
);
1307 bh
= sb_getblk(sb
, tmp_bh
.b_blocknr
);
1313 memcpy(bh
->b_data
+offset
, data
, tocopy
);
1314 flush_dcache_page(bh
->b_page
);
1315 set_buffer_uptodate(bh
);
1316 mark_buffer_dirty(bh
);
1327 if (inode
->i_size
< off
+len
-towrite
)
1328 i_size_write(inode
, off
+len
-towrite
);
1330 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
1331 mark_inode_dirty(inode
);
1332 mutex_unlock(&inode
->i_mutex
);
1333 return len
- towrite
;
1338 static struct file_system_type ext2_fs_type
= {
1339 .owner
= THIS_MODULE
,
1341 .get_sb
= ext2_get_sb
,
1342 .kill_sb
= kill_block_super
,
1343 .fs_flags
= FS_REQUIRES_DEV
,
1346 static int __init
init_ext2_fs(void)
1348 int err
= init_ext2_xattr();
1351 err
= init_inodecache();
1354 err
= register_filesystem(&ext2_fs_type
);
1359 destroy_inodecache();
1365 static void __exit
exit_ext2_fs(void)
1367 unregister_filesystem(&ext2_fs_type
);
1368 destroy_inodecache();
1372 module_init(init_ext2_fs
)
1373 module_exit(exit_ext2_fs
)