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/smp_lock.h>
29 #include <linux/vfs.h>
30 #include <linux/seq_file.h>
31 #include <linux/mount.h>
32 #include <asm/uaccess.h>
38 static void ext2_sync_super(struct super_block
*sb
,
39 struct ext2_super_block
*es
);
40 static int ext2_remount (struct super_block
* sb
, int * flags
, char * data
);
41 static int ext2_statfs (struct dentry
* dentry
, struct kstatfs
* buf
);
43 void ext2_error (struct super_block
* sb
, const char * function
,
44 const char * fmt
, ...)
47 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
48 struct ext2_super_block
*es
= sbi
->s_es
;
50 if (!(sb
->s_flags
& MS_RDONLY
)) {
51 sbi
->s_mount_state
|= EXT2_ERROR_FS
;
53 cpu_to_le16(le16_to_cpu(es
->s_state
) | EXT2_ERROR_FS
);
54 ext2_sync_super(sb
, es
);
58 printk(KERN_CRIT
"EXT2-fs error (device %s): %s: ",sb
->s_id
, function
);
63 if (test_opt(sb
, ERRORS_PANIC
))
64 panic("EXT2-fs panic from previous error\n");
65 if (test_opt(sb
, ERRORS_RO
)) {
66 printk("Remounting filesystem read-only\n");
67 sb
->s_flags
|= MS_RDONLY
;
71 void ext2_warning (struct super_block
* sb
, const char * function
,
72 const char * fmt
, ...)
77 printk(KERN_WARNING
"EXT2-fs warning (device %s): %s: ",
84 void ext2_update_dynamic_rev(struct super_block
*sb
)
86 struct ext2_super_block
*es
= EXT2_SB(sb
)->s_es
;
88 if (le32_to_cpu(es
->s_rev_level
) > EXT2_GOOD_OLD_REV
)
91 ext2_warning(sb
, __FUNCTION__
,
92 "updating to rev %d because of new feature flag, "
93 "running e2fsck is recommended",
96 es
->s_first_ino
= cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO
);
97 es
->s_inode_size
= cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE
);
98 es
->s_rev_level
= cpu_to_le32(EXT2_DYNAMIC_REV
);
99 /* leave es->s_feature_*compat flags alone */
100 /* es->s_uuid will be set by e2fsck if empty */
103 * The rest of the superblock fields should be zero, and if not it
104 * means they are likely already in use, so leave them alone. We
105 * can leave it up to e2fsck to clean up any inconsistencies there.
109 static void ext2_put_super (struct super_block
* sb
)
113 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
115 ext2_xattr_put_super(sb
);
116 if (!(sb
->s_flags
& MS_RDONLY
)) {
117 struct ext2_super_block
*es
= sbi
->s_es
;
119 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
120 ext2_sync_super(sb
, es
);
122 db_count
= sbi
->s_gdb_count
;
123 for (i
= 0; i
< db_count
; i
++)
124 if (sbi
->s_group_desc
[i
])
125 brelse (sbi
->s_group_desc
[i
]);
126 kfree(sbi
->s_group_desc
);
128 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
129 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
130 percpu_counter_destroy(&sbi
->s_dirs_counter
);
132 sb
->s_fs_info
= NULL
;
138 static struct kmem_cache
* ext2_inode_cachep
;
140 static struct inode
*ext2_alloc_inode(struct super_block
*sb
)
142 struct ext2_inode_info
*ei
;
143 ei
= (struct ext2_inode_info
*)kmem_cache_alloc(ext2_inode_cachep
, GFP_KERNEL
);
146 #ifdef CONFIG_EXT2_FS_POSIX_ACL
147 ei
->i_acl
= EXT2_ACL_NOT_CACHED
;
148 ei
->i_default_acl
= EXT2_ACL_NOT_CACHED
;
150 ei
->vfs_inode
.i_version
= 1;
151 return &ei
->vfs_inode
;
154 static void ext2_destroy_inode(struct inode
*inode
)
156 kmem_cache_free(ext2_inode_cachep
, EXT2_I(inode
));
159 static void init_once(void * foo
, struct kmem_cache
* cachep
, unsigned long flags
)
161 struct ext2_inode_info
*ei
= (struct ext2_inode_info
*) foo
;
163 if (flags
& SLAB_CTOR_CONSTRUCTOR
) {
164 rwlock_init(&ei
->i_meta_lock
);
165 #ifdef CONFIG_EXT2_FS_XATTR
166 init_rwsem(&ei
->xattr_sem
);
168 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 ext2_sb_info
*sbi
= EXT2_SB(vfs
->mnt_sb
);
209 if (sbi
->s_mount_opt
& EXT2_MOUNT_GRPID
)
210 seq_puts(seq
, ",grpid");
212 #if defined(CONFIG_QUOTA)
213 if (sbi
->s_mount_opt
& EXT2_MOUNT_USRQUOTA
)
214 seq_puts(seq
, ",usrquota");
216 if (sbi
->s_mount_opt
& EXT2_MOUNT_GRPQUOTA
)
217 seq_puts(seq
, ",grpquota");
220 #if defined(CONFIG_EXT2_FS_XIP)
221 if (sbi
->s_mount_opt
& EXT2_MOUNT_XIP
)
222 seq_puts(seq
, ",xip");
229 static ssize_t
ext2_quota_read(struct super_block
*sb
, int type
, char *data
, size_t len
, loff_t off
);
230 static ssize_t
ext2_quota_write(struct super_block
*sb
, int type
, const char *data
, size_t len
, loff_t off
);
233 static const struct super_operations ext2_sops
= {
234 .alloc_inode
= ext2_alloc_inode
,
235 .destroy_inode
= ext2_destroy_inode
,
236 .read_inode
= ext2_read_inode
,
237 .write_inode
= ext2_write_inode
,
238 .put_inode
= ext2_put_inode
,
239 .delete_inode
= ext2_delete_inode
,
240 .put_super
= ext2_put_super
,
241 .write_super
= ext2_write_super
,
242 .statfs
= ext2_statfs
,
243 .remount_fs
= ext2_remount
,
244 .clear_inode
= ext2_clear_inode
,
245 .show_options
= ext2_show_options
,
247 .quota_read
= ext2_quota_read
,
248 .quota_write
= ext2_quota_write
,
252 static struct dentry
*ext2_get_dentry(struct super_block
*sb
, void *vobjp
)
255 unsigned long ino
= objp
[0];
256 __u32 generation
= objp
[1];
258 struct dentry
*result
;
260 if (ino
< EXT2_FIRST_INO(sb
) && ino
!= EXT2_ROOT_INO
)
261 return ERR_PTR(-ESTALE
);
262 if (ino
> le32_to_cpu(EXT2_SB(sb
)->s_es
->s_inodes_count
))
263 return ERR_PTR(-ESTALE
);
265 /* iget isn't really right if the inode is currently unallocated!!
266 * ext2_read_inode currently does appropriate checks, but
267 * it might be "neater" to call ext2_get_inode first and check
268 * if the inode is valid.....
270 inode
= iget(sb
, ino
);
272 return ERR_PTR(-ENOMEM
);
273 if (is_bad_inode(inode
) ||
274 (generation
&& inode
->i_generation
!= generation
)) {
275 /* we didn't find the right inode.. */
277 return ERR_PTR(-ESTALE
);
279 /* now to find a dentry.
280 * If possible, get a well-connected one
282 result
= d_alloc_anon(inode
);
285 return ERR_PTR(-ENOMEM
);
290 /* Yes, most of these are left as NULL!!
291 * A NULL value implies the default, which works with ext2-like file
292 * systems, but can be improved upon.
293 * Currently only get_parent is required.
295 static struct export_operations ext2_export_ops
= {
296 .get_parent
= ext2_get_parent
,
297 .get_dentry
= ext2_get_dentry
,
300 static unsigned long get_sb_block(void **data
)
302 unsigned long sb_block
;
303 char *options
= (char *) *data
;
305 if (!options
|| strncmp(options
, "sb=", 3) != 0)
306 return 1; /* Default location */
308 sb_block
= simple_strtoul(options
, &options
, 0);
309 if (*options
&& *options
!= ',') {
310 printk("EXT2-fs: Invalid sb specification: %s\n",
316 *data
= (void *) options
;
321 Opt_bsd_df
, Opt_minix_df
, Opt_grpid
, Opt_nogrpid
,
322 Opt_resgid
, Opt_resuid
, Opt_sb
, Opt_err_cont
, Opt_err_panic
,
323 Opt_err_ro
, Opt_nouid32
, Opt_nocheck
, Opt_debug
,
324 Opt_oldalloc
, Opt_orlov
, Opt_nobh
, Opt_user_xattr
, Opt_nouser_xattr
,
325 Opt_acl
, Opt_noacl
, Opt_xip
, Opt_ignore
, Opt_err
, Opt_quota
,
326 Opt_usrquota
, Opt_grpquota
329 static match_table_t tokens
= {
330 {Opt_bsd_df
, "bsddf"},
331 {Opt_minix_df
, "minixdf"},
332 {Opt_grpid
, "grpid"},
333 {Opt_grpid
, "bsdgroups"},
334 {Opt_nogrpid
, "nogrpid"},
335 {Opt_nogrpid
, "sysvgroups"},
336 {Opt_resgid
, "resgid=%u"},
337 {Opt_resuid
, "resuid=%u"},
339 {Opt_err_cont
, "errors=continue"},
340 {Opt_err_panic
, "errors=panic"},
341 {Opt_err_ro
, "errors=remount-ro"},
342 {Opt_nouid32
, "nouid32"},
343 {Opt_nocheck
, "check=none"},
344 {Opt_nocheck
, "nocheck"},
345 {Opt_debug
, "debug"},
346 {Opt_oldalloc
, "oldalloc"},
347 {Opt_orlov
, "orlov"},
349 {Opt_user_xattr
, "user_xattr"},
350 {Opt_nouser_xattr
, "nouser_xattr"},
352 {Opt_noacl
, "noacl"},
354 {Opt_grpquota
, "grpquota"},
355 {Opt_ignore
, "noquota"},
356 {Opt_quota
, "quota"},
357 {Opt_usrquota
, "usrquota"},
361 static int parse_options (char * options
,
362 struct ext2_sb_info
*sbi
)
365 substring_t args
[MAX_OPT_ARGS
];
371 while ((p
= strsep (&options
, ",")) != NULL
) {
376 token
= match_token(p
, tokens
, args
);
379 clear_opt (sbi
->s_mount_opt
, MINIX_DF
);
382 set_opt (sbi
->s_mount_opt
, MINIX_DF
);
385 set_opt (sbi
->s_mount_opt
, GRPID
);
388 clear_opt (sbi
->s_mount_opt
, GRPID
);
391 if (match_int(&args
[0], &option
))
393 sbi
->s_resuid
= option
;
396 if (match_int(&args
[0], &option
))
398 sbi
->s_resgid
= option
;
401 /* handled by get_sb_block() instead of here */
402 /* *sb_block = match_int(&args[0]); */
405 clear_opt (sbi
->s_mount_opt
, ERRORS_CONT
);
406 clear_opt (sbi
->s_mount_opt
, ERRORS_RO
);
407 set_opt (sbi
->s_mount_opt
, ERRORS_PANIC
);
410 clear_opt (sbi
->s_mount_opt
, ERRORS_CONT
);
411 clear_opt (sbi
->s_mount_opt
, ERRORS_PANIC
);
412 set_opt (sbi
->s_mount_opt
, ERRORS_RO
);
415 clear_opt (sbi
->s_mount_opt
, ERRORS_RO
);
416 clear_opt (sbi
->s_mount_opt
, ERRORS_PANIC
);
417 set_opt (sbi
->s_mount_opt
, ERRORS_CONT
);
420 set_opt (sbi
->s_mount_opt
, NO_UID32
);
423 clear_opt (sbi
->s_mount_opt
, CHECK
);
426 set_opt (sbi
->s_mount_opt
, DEBUG
);
429 set_opt (sbi
->s_mount_opt
, OLDALLOC
);
432 clear_opt (sbi
->s_mount_opt
, OLDALLOC
);
435 set_opt (sbi
->s_mount_opt
, NOBH
);
437 #ifdef CONFIG_EXT2_FS_XATTR
439 set_opt (sbi
->s_mount_opt
, XATTR_USER
);
441 case Opt_nouser_xattr
:
442 clear_opt (sbi
->s_mount_opt
, XATTR_USER
);
446 case Opt_nouser_xattr
:
447 printk("EXT2 (no)user_xattr options not supported\n");
450 #ifdef CONFIG_EXT2_FS_POSIX_ACL
452 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
455 clear_opt(sbi
->s_mount_opt
, POSIX_ACL
);
460 printk("EXT2 (no)acl options not supported\n");
464 #ifdef CONFIG_EXT2_FS_XIP
465 set_opt (sbi
->s_mount_opt
, XIP
);
467 printk("EXT2 xip option not supported\n");
471 #if defined(CONFIG_QUOTA)
474 set_opt(sbi
->s_mount_opt
, USRQUOTA
);
478 set_opt(sbi
->s_mount_opt
, GRPQUOTA
);
485 "EXT2-fs: quota operations not supported.\n");
499 static int ext2_setup_super (struct super_block
* sb
,
500 struct ext2_super_block
* es
,
504 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
506 if (le32_to_cpu(es
->s_rev_level
) > EXT2_MAX_SUPP_REV
) {
507 printk ("EXT2-fs warning: revision level too high, "
508 "forcing read-only mode\n");
513 if (!(sbi
->s_mount_state
& EXT2_VALID_FS
))
514 printk ("EXT2-fs warning: mounting unchecked fs, "
515 "running e2fsck is recommended\n");
516 else if ((sbi
->s_mount_state
& EXT2_ERROR_FS
))
517 printk ("EXT2-fs warning: mounting fs with errors, "
518 "running e2fsck is recommended\n");
519 else if ((__s16
) le16_to_cpu(es
->s_max_mnt_count
) >= 0 &&
520 le16_to_cpu(es
->s_mnt_count
) >=
521 (unsigned short) (__s16
) le16_to_cpu(es
->s_max_mnt_count
))
522 printk ("EXT2-fs warning: maximal mount count reached, "
523 "running e2fsck is recommended\n");
524 else if (le32_to_cpu(es
->s_checkinterval
) &&
525 (le32_to_cpu(es
->s_lastcheck
) + le32_to_cpu(es
->s_checkinterval
) <= get_seconds()))
526 printk ("EXT2-fs warning: checktime reached, "
527 "running e2fsck is recommended\n");
528 if (!le16_to_cpu(es
->s_max_mnt_count
))
529 es
->s_max_mnt_count
= cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT
);
530 es
->s_mnt_count
=cpu_to_le16(le16_to_cpu(es
->s_mnt_count
) + 1);
531 ext2_write_super(sb
);
532 if (test_opt (sb
, DEBUG
))
533 printk ("[EXT II FS %s, %s, bs=%lu, fs=%lu, gc=%lu, "
534 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
535 EXT2FS_VERSION
, EXT2FS_DATE
, sb
->s_blocksize
,
538 EXT2_BLOCKS_PER_GROUP(sb
),
539 EXT2_INODES_PER_GROUP(sb
),
544 static int ext2_check_descriptors (struct super_block
* sb
)
548 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
549 unsigned long first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
);
550 unsigned long last_block
;
551 struct ext2_group_desc
* gdp
= NULL
;
553 ext2_debug ("Checking group descriptors");
555 for (i
= 0; i
< sbi
->s_groups_count
; i
++)
557 if (i
== sbi
->s_groups_count
- 1)
558 last_block
= le32_to_cpu(sbi
->s_es
->s_blocks_count
) - 1;
560 last_block
= first_block
+
561 (EXT2_BLOCKS_PER_GROUP(sb
) - 1);
563 if ((i
% EXT2_DESC_PER_BLOCK(sb
)) == 0)
564 gdp
= (struct ext2_group_desc
*) sbi
->s_group_desc
[desc_block
++]->b_data
;
565 if (le32_to_cpu(gdp
->bg_block_bitmap
) < first_block
||
566 le32_to_cpu(gdp
->bg_block_bitmap
) > last_block
)
568 ext2_error (sb
, "ext2_check_descriptors",
569 "Block bitmap for group %d"
570 " not in group (block %lu)!",
571 i
, (unsigned long) le32_to_cpu(gdp
->bg_block_bitmap
));
574 if (le32_to_cpu(gdp
->bg_inode_bitmap
) < first_block
||
575 le32_to_cpu(gdp
->bg_inode_bitmap
) > last_block
)
577 ext2_error (sb
, "ext2_check_descriptors",
578 "Inode bitmap for group %d"
579 " not in group (block %lu)!",
580 i
, (unsigned long) le32_to_cpu(gdp
->bg_inode_bitmap
));
583 if (le32_to_cpu(gdp
->bg_inode_table
) < first_block
||
584 le32_to_cpu(gdp
->bg_inode_table
) + sbi
->s_itb_per_group
>
587 ext2_error (sb
, "ext2_check_descriptors",
588 "Inode table for group %d"
589 " not in group (block %lu)!",
590 i
, (unsigned long) le32_to_cpu(gdp
->bg_inode_table
));
593 first_block
+= EXT2_BLOCKS_PER_GROUP(sb
);
600 * Maximal file size. There is a direct, and {,double-,triple-}indirect
601 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
602 * We need to be 1 filesystem block less than the 2^32 sector limit.
604 static loff_t
ext2_max_size(int bits
)
606 loff_t res
= EXT2_NDIR_BLOCKS
;
607 /* This constant is calculated to be the largest file size for a
608 * dense, 4k-blocksize file such that the total number of
609 * sectors in the file, including data and all indirect blocks,
610 * does not exceed 2^32. */
611 const loff_t upper_limit
= 0x1ff7fffd000LL
;
613 res
+= 1LL << (bits
-2);
614 res
+= 1LL << (2*(bits
-2));
615 res
+= 1LL << (3*(bits
-2));
617 if (res
> upper_limit
)
622 static unsigned long descriptor_loc(struct super_block
*sb
,
623 unsigned long logic_sb_block
,
626 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
627 unsigned long bg
, first_data_block
, first_meta_bg
;
630 first_data_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
);
631 first_meta_bg
= le32_to_cpu(sbi
->s_es
->s_first_meta_bg
);
633 if (!EXT2_HAS_INCOMPAT_FEATURE(sb
, EXT2_FEATURE_INCOMPAT_META_BG
) ||
635 return (logic_sb_block
+ nr
+ 1);
636 bg
= sbi
->s_desc_per_block
* nr
;
637 if (ext2_bg_has_super(sb
, bg
))
639 return (first_data_block
+ has_super
+ (bg
* sbi
->s_blocks_per_group
));
642 static int ext2_fill_super(struct super_block
*sb
, void *data
, int silent
)
644 struct buffer_head
* bh
;
645 struct ext2_sb_info
* sbi
;
646 struct ext2_super_block
* es
;
649 unsigned long sb_block
= get_sb_block(&data
);
650 unsigned long logic_sb_block
;
651 unsigned long offset
= 0;
652 unsigned long def_mount_opts
;
653 int blocksize
= BLOCK_SIZE
;
658 sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
664 * See what the current blocksize for the device is, and
665 * use that as the blocksize. Otherwise (or if the blocksize
666 * is smaller than the default) use the default.
667 * This is important for devices that have a hardware
668 * sectorsize that is larger than the default.
670 blocksize
= sb_min_blocksize(sb
, BLOCK_SIZE
);
672 printk ("EXT2-fs: unable to set blocksize\n");
677 * If the superblock doesn't start on a hardware sector boundary,
678 * calculate the offset.
680 if (blocksize
!= BLOCK_SIZE
) {
681 logic_sb_block
= (sb_block
*BLOCK_SIZE
) / blocksize
;
682 offset
= (sb_block
*BLOCK_SIZE
) % blocksize
;
684 logic_sb_block
= sb_block
;
687 if (!(bh
= sb_bread(sb
, logic_sb_block
))) {
688 printk ("EXT2-fs: unable to read superblock\n");
692 * Note: s_es must be initialized as soon as possible because
693 * some ext2 macro-instructions depend on its value
695 es
= (struct ext2_super_block
*) (((char *)bh
->b_data
) + offset
);
697 sb
->s_magic
= le16_to_cpu(es
->s_magic
);
699 if (sb
->s_magic
!= EXT2_SUPER_MAGIC
)
702 /* Set defaults before we parse the mount options */
703 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
704 if (def_mount_opts
& EXT2_DEFM_DEBUG
)
705 set_opt(sbi
->s_mount_opt
, DEBUG
);
706 if (def_mount_opts
& EXT2_DEFM_BSDGROUPS
)
707 set_opt(sbi
->s_mount_opt
, GRPID
);
708 if (def_mount_opts
& EXT2_DEFM_UID16
)
709 set_opt(sbi
->s_mount_opt
, NO_UID32
);
710 #ifdef CONFIG_EXT2_FS_XATTR
711 if (def_mount_opts
& EXT2_DEFM_XATTR_USER
)
712 set_opt(sbi
->s_mount_opt
, XATTR_USER
);
714 #ifdef CONFIG_EXT2_FS_POSIX_ACL
715 if (def_mount_opts
& EXT2_DEFM_ACL
)
716 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
719 if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT2_ERRORS_PANIC
)
720 set_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
721 else if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT2_ERRORS_RO
)
722 set_opt(sbi
->s_mount_opt
, ERRORS_RO
);
724 set_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
726 sbi
->s_resuid
= le16_to_cpu(es
->s_def_resuid
);
727 sbi
->s_resgid
= le16_to_cpu(es
->s_def_resgid
);
729 if (!parse_options ((char *) data
, sbi
))
732 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
733 ((EXT2_SB(sb
)->s_mount_opt
& EXT2_MOUNT_POSIX_ACL
) ?
736 ext2_xip_verify_sb(sb
); /* see if bdev supports xip, unset
737 EXT2_MOUNT_XIP if not */
739 if (le32_to_cpu(es
->s_rev_level
) == EXT2_GOOD_OLD_REV
&&
740 (EXT2_HAS_COMPAT_FEATURE(sb
, ~0U) ||
741 EXT2_HAS_RO_COMPAT_FEATURE(sb
, ~0U) ||
742 EXT2_HAS_INCOMPAT_FEATURE(sb
, ~0U)))
743 printk("EXT2-fs warning: feature flags set on rev 0 fs, "
744 "running e2fsck is recommended\n");
746 * Check feature flags regardless of the revision level, since we
747 * previously didn't change the revision level when setting the flags,
748 * so there is a chance incompat flags are set on a rev 0 filesystem.
750 features
= EXT2_HAS_INCOMPAT_FEATURE(sb
, ~EXT2_FEATURE_INCOMPAT_SUPP
);
752 printk("EXT2-fs: %s: couldn't mount because of "
753 "unsupported optional features (%x).\n",
754 sb
->s_id
, le32_to_cpu(features
));
757 if (!(sb
->s_flags
& MS_RDONLY
) &&
758 (features
= EXT2_HAS_RO_COMPAT_FEATURE(sb
, ~EXT2_FEATURE_RO_COMPAT_SUPP
))){
759 printk("EXT2-fs: %s: couldn't mount RDWR because of "
760 "unsupported optional features (%x).\n",
761 sb
->s_id
, le32_to_cpu(features
));
765 blocksize
= BLOCK_SIZE
<< le32_to_cpu(sbi
->s_es
->s_log_block_size
);
767 if ((ext2_use_xip(sb
)) && ((blocksize
!= PAGE_SIZE
) ||
768 (sb
->s_blocksize
!= blocksize
))) {
770 printk("XIP: Unsupported blocksize\n");
774 /* If the blocksize doesn't match, re-read the thing.. */
775 if (sb
->s_blocksize
!= blocksize
) {
778 if (!sb_set_blocksize(sb
, blocksize
)) {
779 printk(KERN_ERR
"EXT2-fs: blocksize too small for device.\n");
783 logic_sb_block
= (sb_block
*BLOCK_SIZE
) / blocksize
;
784 offset
= (sb_block
*BLOCK_SIZE
) % blocksize
;
785 bh
= sb_bread(sb
, logic_sb_block
);
787 printk("EXT2-fs: Couldn't read superblock on "
791 es
= (struct ext2_super_block
*) (((char *)bh
->b_data
) + offset
);
793 if (es
->s_magic
!= cpu_to_le16(EXT2_SUPER_MAGIC
)) {
794 printk ("EXT2-fs: Magic mismatch, very weird !\n");
799 sb
->s_maxbytes
= ext2_max_size(sb
->s_blocksize_bits
);
801 if (le32_to_cpu(es
->s_rev_level
) == EXT2_GOOD_OLD_REV
) {
802 sbi
->s_inode_size
= EXT2_GOOD_OLD_INODE_SIZE
;
803 sbi
->s_first_ino
= EXT2_GOOD_OLD_FIRST_INO
;
805 sbi
->s_inode_size
= le16_to_cpu(es
->s_inode_size
);
806 sbi
->s_first_ino
= le32_to_cpu(es
->s_first_ino
);
807 if ((sbi
->s_inode_size
< EXT2_GOOD_OLD_INODE_SIZE
) ||
808 (sbi
->s_inode_size
& (sbi
->s_inode_size
- 1)) ||
809 (sbi
->s_inode_size
> blocksize
)) {
810 printk ("EXT2-fs: unsupported inode size: %d\n",
816 sbi
->s_frag_size
= EXT2_MIN_FRAG_SIZE
<<
817 le32_to_cpu(es
->s_log_frag_size
);
818 if (sbi
->s_frag_size
== 0)
820 sbi
->s_frags_per_block
= sb
->s_blocksize
/ sbi
->s_frag_size
;
822 sbi
->s_blocks_per_group
= le32_to_cpu(es
->s_blocks_per_group
);
823 sbi
->s_frags_per_group
= le32_to_cpu(es
->s_frags_per_group
);
824 sbi
->s_inodes_per_group
= le32_to_cpu(es
->s_inodes_per_group
);
826 if (EXT2_INODE_SIZE(sb
) == 0)
828 sbi
->s_inodes_per_block
= sb
->s_blocksize
/ EXT2_INODE_SIZE(sb
);
829 if (sbi
->s_inodes_per_block
== 0 || sbi
->s_inodes_per_group
== 0)
831 sbi
->s_itb_per_group
= sbi
->s_inodes_per_group
/
832 sbi
->s_inodes_per_block
;
833 sbi
->s_desc_per_block
= sb
->s_blocksize
/
834 sizeof (struct ext2_group_desc
);
836 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
837 sbi
->s_addr_per_block_bits
=
838 ilog2 (EXT2_ADDR_PER_BLOCK(sb
));
839 sbi
->s_desc_per_block_bits
=
840 ilog2 (EXT2_DESC_PER_BLOCK(sb
));
842 if (sb
->s_magic
!= EXT2_SUPER_MAGIC
)
845 if (sb
->s_blocksize
!= bh
->b_size
) {
847 printk ("VFS: Unsupported blocksize on dev "
852 if (sb
->s_blocksize
!= sbi
->s_frag_size
) {
853 printk ("EXT2-fs: fragsize %lu != blocksize %lu (not supported yet)\n",
854 sbi
->s_frag_size
, sb
->s_blocksize
);
858 if (sbi
->s_blocks_per_group
> sb
->s_blocksize
* 8) {
859 printk ("EXT2-fs: #blocks per group too big: %lu\n",
860 sbi
->s_blocks_per_group
);
863 if (sbi
->s_frags_per_group
> sb
->s_blocksize
* 8) {
864 printk ("EXT2-fs: #fragments per group too big: %lu\n",
865 sbi
->s_frags_per_group
);
868 if (sbi
->s_inodes_per_group
> sb
->s_blocksize
* 8) {
869 printk ("EXT2-fs: #inodes per group too big: %lu\n",
870 sbi
->s_inodes_per_group
);
874 if (EXT2_BLOCKS_PER_GROUP(sb
) == 0)
876 sbi
->s_groups_count
= ((le32_to_cpu(es
->s_blocks_count
) -
877 le32_to_cpu(es
->s_first_data_block
) - 1)
878 / EXT2_BLOCKS_PER_GROUP(sb
)) + 1;
879 db_count
= (sbi
->s_groups_count
+ EXT2_DESC_PER_BLOCK(sb
) - 1) /
880 EXT2_DESC_PER_BLOCK(sb
);
881 sbi
->s_group_desc
= kmalloc (db_count
* sizeof (struct buffer_head
*), GFP_KERNEL
);
882 if (sbi
->s_group_desc
== NULL
) {
883 printk ("EXT2-fs: not enough memory\n");
886 bgl_lock_init(&sbi
->s_blockgroup_lock
);
887 sbi
->s_debts
= kmalloc(sbi
->s_groups_count
* sizeof(*sbi
->s_debts
),
890 printk ("EXT2-fs: not enough memory\n");
891 goto failed_mount_group_desc
;
893 memset(sbi
->s_debts
, 0, sbi
->s_groups_count
* sizeof(*sbi
->s_debts
));
894 for (i
= 0; i
< db_count
; i
++) {
895 block
= descriptor_loc(sb
, logic_sb_block
, i
);
896 sbi
->s_group_desc
[i
] = sb_bread(sb
, block
);
897 if (!sbi
->s_group_desc
[i
]) {
898 for (j
= 0; j
< i
; j
++)
899 brelse (sbi
->s_group_desc
[j
]);
900 printk ("EXT2-fs: unable to read group descriptors\n");
901 goto failed_mount_group_desc
;
904 if (!ext2_check_descriptors (sb
)) {
905 printk ("EXT2-fs: group descriptors corrupted!\n");
908 sbi
->s_gdb_count
= db_count
;
909 get_random_bytes(&sbi
->s_next_generation
, sizeof(u32
));
910 spin_lock_init(&sbi
->s_next_gen_lock
);
912 percpu_counter_init(&sbi
->s_freeblocks_counter
,
913 ext2_count_free_blocks(sb
));
914 percpu_counter_init(&sbi
->s_freeinodes_counter
,
915 ext2_count_free_inodes(sb
));
916 percpu_counter_init(&sbi
->s_dirs_counter
,
917 ext2_count_dirs(sb
));
919 * set up enough so that it can read an inode
921 sb
->s_op
= &ext2_sops
;
922 sb
->s_export_op
= &ext2_export_ops
;
923 sb
->s_xattr
= ext2_xattr_handlers
;
924 root
= iget(sb
, EXT2_ROOT_INO
);
925 sb
->s_root
= d_alloc_root(root
);
928 printk(KERN_ERR
"EXT2-fs: get root inode failed\n");
931 if (!S_ISDIR(root
->i_mode
) || !root
->i_blocks
|| !root
->i_size
) {
934 printk(KERN_ERR
"EXT2-fs: corrupt root inode, run e2fsck\n");
937 if (EXT2_HAS_COMPAT_FEATURE(sb
, EXT3_FEATURE_COMPAT_HAS_JOURNAL
))
938 ext2_warning(sb
, __FUNCTION__
,
939 "mounting ext3 filesystem as ext2");
940 ext2_setup_super (sb
, es
, sb
->s_flags
& MS_RDONLY
);
945 printk("VFS: Can't find an ext2 filesystem on dev %s.\n",
949 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
950 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
951 percpu_counter_destroy(&sbi
->s_dirs_counter
);
953 for (i
= 0; i
< db_count
; i
++)
954 brelse(sbi
->s_group_desc
[i
]);
955 failed_mount_group_desc
:
956 kfree(sbi
->s_group_desc
);
961 sb
->s_fs_info
= NULL
;
966 static void ext2_commit_super (struct super_block
* sb
,
967 struct ext2_super_block
* es
)
969 es
->s_wtime
= cpu_to_le32(get_seconds());
970 mark_buffer_dirty(EXT2_SB(sb
)->s_sbh
);
974 static void ext2_sync_super(struct super_block
*sb
, struct ext2_super_block
*es
)
976 es
->s_free_blocks_count
= cpu_to_le32(ext2_count_free_blocks(sb
));
977 es
->s_free_inodes_count
= cpu_to_le32(ext2_count_free_inodes(sb
));
978 es
->s_wtime
= cpu_to_le32(get_seconds());
979 mark_buffer_dirty(EXT2_SB(sb
)->s_sbh
);
980 sync_dirty_buffer(EXT2_SB(sb
)->s_sbh
);
985 * In the second extended file system, it is not necessary to
986 * write the super block since we use a mapping of the
987 * disk super block in a buffer.
989 * However, this function is still used to set the fs valid
990 * flags to 0. We need to set this flag to 0 since the fs
991 * may have been checked while mounted and e2fsck may have
992 * set s_state to EXT2_VALID_FS after some corrections.
995 void ext2_write_super (struct super_block
* sb
)
997 struct ext2_super_block
* es
;
999 if (!(sb
->s_flags
& MS_RDONLY
)) {
1000 es
= EXT2_SB(sb
)->s_es
;
1002 if (le16_to_cpu(es
->s_state
) & EXT2_VALID_FS
) {
1003 ext2_debug ("setting valid to 0\n");
1004 es
->s_state
= cpu_to_le16(le16_to_cpu(es
->s_state
) &
1006 es
->s_free_blocks_count
= cpu_to_le32(ext2_count_free_blocks(sb
));
1007 es
->s_free_inodes_count
= cpu_to_le32(ext2_count_free_inodes(sb
));
1008 es
->s_mtime
= cpu_to_le32(get_seconds());
1009 ext2_sync_super(sb
, es
);
1011 ext2_commit_super (sb
, es
);
1017 static int ext2_remount (struct super_block
* sb
, int * flags
, char * data
)
1019 struct ext2_sb_info
* sbi
= EXT2_SB(sb
);
1020 struct ext2_super_block
* es
;
1021 unsigned long old_mount_opt
= sbi
->s_mount_opt
;
1022 struct ext2_mount_options old_opts
;
1023 unsigned long old_sb_flags
;
1026 /* Store the old options */
1027 old_sb_flags
= sb
->s_flags
;
1028 old_opts
.s_mount_opt
= sbi
->s_mount_opt
;
1029 old_opts
.s_resuid
= sbi
->s_resuid
;
1030 old_opts
.s_resgid
= sbi
->s_resgid
;
1033 * Allow the "check" option to be passed as a remount option.
1035 if (!parse_options (data
, sbi
)) {
1040 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
1041 ((sbi
->s_mount_opt
& EXT2_MOUNT_POSIX_ACL
) ? MS_POSIXACL
: 0);
1044 if (((sbi
->s_mount_opt
& EXT2_MOUNT_XIP
) !=
1045 (old_mount_opt
& EXT2_MOUNT_XIP
)) &&
1046 invalidate_inodes(sb
))
1047 ext2_warning(sb
, __FUNCTION__
, "busy inodes while remounting "\
1048 "xip remain in cache (no functional problem)");
1049 if ((*flags
& MS_RDONLY
) == (sb
->s_flags
& MS_RDONLY
))
1051 if (*flags
& MS_RDONLY
) {
1052 if (le16_to_cpu(es
->s_state
) & EXT2_VALID_FS
||
1053 !(sbi
->s_mount_state
& EXT2_VALID_FS
))
1056 * OK, we are remounting a valid rw partition rdonly, so set
1057 * the rdonly flag and then mark the partition as valid again.
1059 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
1060 es
->s_mtime
= cpu_to_le32(get_seconds());
1062 __le32 ret
= EXT2_HAS_RO_COMPAT_FEATURE(sb
,
1063 ~EXT2_FEATURE_RO_COMPAT_SUPP
);
1065 printk("EXT2-fs: %s: couldn't remount RDWR because of "
1066 "unsupported optional features (%x).\n",
1067 sb
->s_id
, le32_to_cpu(ret
));
1072 * Mounting a RDONLY partition read-write, so reread and
1073 * store the current valid flag. (It may have been changed
1074 * by e2fsck since we originally mounted the partition.)
1076 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
1077 if (!ext2_setup_super (sb
, es
, 0))
1078 sb
->s_flags
&= ~MS_RDONLY
;
1080 ext2_sync_super(sb
, es
);
1083 sbi
->s_mount_opt
= old_opts
.s_mount_opt
;
1084 sbi
->s_resuid
= old_opts
.s_resuid
;
1085 sbi
->s_resgid
= old_opts
.s_resgid
;
1086 sb
->s_flags
= old_sb_flags
;
1090 static int ext2_statfs (struct dentry
* dentry
, struct kstatfs
* buf
)
1092 struct super_block
*sb
= dentry
->d_sb
;
1093 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
1094 struct ext2_super_block
*es
= sbi
->s_es
;
1095 unsigned long overhead
;
1099 if (test_opt (sb
, MINIX_DF
))
1103 * Compute the overhead (FS structures)
1107 * All of the blocks before first_data_block are
1110 overhead
= le32_to_cpu(es
->s_first_data_block
);
1113 * Add the overhead attributed to the superblock and
1114 * block group descriptors. If the sparse superblocks
1115 * feature is turned on, then not all groups have this.
1117 for (i
= 0; i
< sbi
->s_groups_count
; i
++)
1118 overhead
+= ext2_bg_has_super(sb
, i
) +
1119 ext2_bg_num_gdb(sb
, i
);
1122 * Every block group has an inode bitmap, a block
1123 * bitmap, and an inode table.
1125 overhead
+= (sbi
->s_groups_count
*
1126 (2 + sbi
->s_itb_per_group
));
1129 buf
->f_type
= EXT2_SUPER_MAGIC
;
1130 buf
->f_bsize
= sb
->s_blocksize
;
1131 buf
->f_blocks
= le32_to_cpu(es
->s_blocks_count
) - overhead
;
1132 buf
->f_bfree
= ext2_count_free_blocks(sb
);
1133 buf
->f_bavail
= buf
->f_bfree
- le32_to_cpu(es
->s_r_blocks_count
);
1134 if (buf
->f_bfree
< le32_to_cpu(es
->s_r_blocks_count
))
1136 buf
->f_files
= le32_to_cpu(es
->s_inodes_count
);
1137 buf
->f_ffree
= ext2_count_free_inodes(sb
);
1138 buf
->f_namelen
= EXT2_NAME_LEN
;
1139 fsid
= le64_to_cpup((void *)es
->s_uuid
) ^
1140 le64_to_cpup((void *)es
->s_uuid
+ sizeof(u64
));
1141 buf
->f_fsid
.val
[0] = fsid
& 0xFFFFFFFFUL
;
1142 buf
->f_fsid
.val
[1] = (fsid
>> 32) & 0xFFFFFFFFUL
;
1146 static int ext2_get_sb(struct file_system_type
*fs_type
,
1147 int flags
, const char *dev_name
, void *data
, struct vfsmount
*mnt
)
1149 return get_sb_bdev(fs_type
, flags
, dev_name
, data
, ext2_fill_super
, mnt
);
1154 /* Read data from quotafile - avoid pagecache and such because we cannot afford
1155 * acquiring the locks... As quota files are never truncated and quota code
1156 * itself serializes the operations (and noone else should touch the files)
1157 * we don't have to be afraid of races */
1158 static ssize_t
ext2_quota_read(struct super_block
*sb
, int type
, char *data
,
1159 size_t len
, loff_t off
)
1161 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
1162 sector_t blk
= off
>> EXT2_BLOCK_SIZE_BITS(sb
);
1164 int offset
= off
& (sb
->s_blocksize
- 1);
1167 struct buffer_head tmp_bh
;
1168 struct buffer_head
*bh
;
1169 loff_t i_size
= i_size_read(inode
);
1173 if (off
+len
> i_size
)
1176 while (toread
> 0) {
1177 tocopy
= sb
->s_blocksize
- offset
< toread
?
1178 sb
->s_blocksize
- offset
: toread
;
1181 err
= ext2_get_block(inode
, blk
, &tmp_bh
, 0);
1184 if (!buffer_mapped(&tmp_bh
)) /* A hole? */
1185 memset(data
, 0, tocopy
);
1187 bh
= sb_bread(sb
, tmp_bh
.b_blocknr
);
1190 memcpy(data
, bh
->b_data
+offset
, tocopy
);
1201 /* Write to quotafile */
1202 static ssize_t
ext2_quota_write(struct super_block
*sb
, int type
,
1203 const char *data
, size_t len
, loff_t off
)
1205 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
1206 sector_t blk
= off
>> EXT2_BLOCK_SIZE_BITS(sb
);
1208 int offset
= off
& (sb
->s_blocksize
- 1);
1210 size_t towrite
= len
;
1211 struct buffer_head tmp_bh
;
1212 struct buffer_head
*bh
;
1214 mutex_lock_nested(&inode
->i_mutex
, I_MUTEX_QUOTA
);
1215 while (towrite
> 0) {
1216 tocopy
= sb
->s_blocksize
- offset
< towrite
?
1217 sb
->s_blocksize
- offset
: towrite
;
1220 err
= ext2_get_block(inode
, blk
, &tmp_bh
, 1);
1223 if (offset
|| tocopy
!= EXT2_BLOCK_SIZE(sb
))
1224 bh
= sb_bread(sb
, tmp_bh
.b_blocknr
);
1226 bh
= sb_getblk(sb
, tmp_bh
.b_blocknr
);
1232 memcpy(bh
->b_data
+offset
, data
, tocopy
);
1233 flush_dcache_page(bh
->b_page
);
1234 set_buffer_uptodate(bh
);
1235 mark_buffer_dirty(bh
);
1246 if (inode
->i_size
< off
+len
-towrite
)
1247 i_size_write(inode
, off
+len
-towrite
);
1249 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
1250 mark_inode_dirty(inode
);
1251 mutex_unlock(&inode
->i_mutex
);
1252 return len
- towrite
;
1257 static struct file_system_type ext2_fs_type
= {
1258 .owner
= THIS_MODULE
,
1260 .get_sb
= ext2_get_sb
,
1261 .kill_sb
= kill_block_super
,
1262 .fs_flags
= FS_REQUIRES_DEV
,
1265 static int __init
init_ext2_fs(void)
1267 int err
= init_ext2_xattr();
1270 err
= init_inodecache();
1273 err
= register_filesystem(&ext2_fs_type
);
1278 destroy_inodecache();
1284 static void __exit
exit_ext2_fs(void)
1286 unregister_filesystem(&ext2_fs_type
);
1287 destroy_inodecache();
1291 module_init(init_ext2_fs
)
1292 module_exit(exit_ext2_fs
)