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 kmem_cache_t
* 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
, SLAB_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
, kmem_cache_t
* cachep
, unsigned long flags
)
161 struct ext2_inode_info
*ei
= (struct ext2_inode_info
*) foo
;
163 if ((flags
& (SLAB_CTOR_VERIFY
|SLAB_CTOR_CONSTRUCTOR
)) ==
164 SLAB_CTOR_CONSTRUCTOR
) {
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
);
173 static int init_inodecache(void)
175 ext2_inode_cachep
= kmem_cache_create("ext2_inode_cache",
176 sizeof(struct ext2_inode_info
),
177 0, (SLAB_RECLAIM_ACCOUNT
|
180 if (ext2_inode_cachep
== NULL
)
185 static void destroy_inodecache(void)
187 if (kmem_cache_destroy(ext2_inode_cachep
))
188 printk(KERN_INFO
"ext2_inode_cache: not all structures were freed\n");
191 static void ext2_clear_inode(struct inode
*inode
)
193 #ifdef CONFIG_EXT2_FS_POSIX_ACL
194 struct ext2_inode_info
*ei
= EXT2_I(inode
);
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
;
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
;
207 static int ext2_show_options(struct seq_file
*seq
, struct vfsmount
*vfs
)
209 struct ext2_sb_info
*sbi
= EXT2_SB(vfs
->mnt_sb
);
211 if (sbi
->s_mount_opt
& EXT2_MOUNT_GRPID
)
212 seq_puts(seq
, ",grpid");
214 #if defined(CONFIG_QUOTA)
215 if (sbi
->s_mount_opt
& EXT2_MOUNT_USRQUOTA
)
216 seq_puts(seq
, ",usrquota");
218 if (sbi
->s_mount_opt
& EXT2_MOUNT_GRPQUOTA
)
219 seq_puts(seq
, ",grpquota");
222 #if defined(CONFIG_EXT2_FS_XIP)
223 if (sbi
->s_mount_opt
& EXT2_MOUNT_XIP
)
224 seq_puts(seq
, ",xip");
231 static ssize_t
ext2_quota_read(struct super_block
*sb
, int type
, char *data
, size_t len
, loff_t off
);
232 static ssize_t
ext2_quota_write(struct super_block
*sb
, int type
, const char *data
, size_t len
, loff_t off
);
235 static struct super_operations ext2_sops
= {
236 .alloc_inode
= ext2_alloc_inode
,
237 .destroy_inode
= ext2_destroy_inode
,
238 .read_inode
= ext2_read_inode
,
239 .write_inode
= ext2_write_inode
,
240 .put_inode
= ext2_put_inode
,
241 .delete_inode
= ext2_delete_inode
,
242 .put_super
= ext2_put_super
,
243 .write_super
= ext2_write_super
,
244 .statfs
= ext2_statfs
,
245 .remount_fs
= ext2_remount
,
246 .clear_inode
= ext2_clear_inode
,
247 .show_options
= ext2_show_options
,
249 .quota_read
= ext2_quota_read
,
250 .quota_write
= ext2_quota_write
,
254 static struct dentry
*ext2_get_dentry(struct super_block
*sb
, void *vobjp
)
257 unsigned long ino
= objp
[0];
258 __u32 generation
= objp
[1];
260 struct dentry
*result
;
262 if (ino
< EXT2_FIRST_INO(sb
) && ino
!= EXT2_ROOT_INO
)
263 return ERR_PTR(-ESTALE
);
264 if (ino
> le32_to_cpu(EXT2_SB(sb
)->s_es
->s_inodes_count
))
265 return ERR_PTR(-ESTALE
);
267 /* iget isn't really right if the inode is currently unallocated!!
268 * ext2_read_inode currently does appropriate checks, but
269 * it might be "neater" to call ext2_get_inode first and check
270 * if the inode is valid.....
272 inode
= iget(sb
, ino
);
274 return ERR_PTR(-ENOMEM
);
275 if (is_bad_inode(inode
) ||
276 (generation
&& inode
->i_generation
!= generation
)) {
277 /* we didn't find the right inode.. */
279 return ERR_PTR(-ESTALE
);
281 /* now to find a dentry.
282 * If possible, get a well-connected one
284 result
= d_alloc_anon(inode
);
287 return ERR_PTR(-ENOMEM
);
292 /* Yes, most of these are left as NULL!!
293 * A NULL value implies the default, which works with ext2-like file
294 * systems, but can be improved upon.
295 * Currently only get_parent is required.
297 static struct export_operations ext2_export_ops
= {
298 .get_parent
= ext2_get_parent
,
299 .get_dentry
= ext2_get_dentry
,
302 static unsigned long get_sb_block(void **data
)
304 unsigned long sb_block
;
305 char *options
= (char *) *data
;
307 if (!options
|| strncmp(options
, "sb=", 3) != 0)
308 return 1; /* Default location */
310 sb_block
= simple_strtoul(options
, &options
, 0);
311 if (*options
&& *options
!= ',') {
312 printk("EXT2-fs: Invalid sb specification: %s\n",
318 *data
= (void *) options
;
323 Opt_bsd_df
, Opt_minix_df
, Opt_grpid
, Opt_nogrpid
,
324 Opt_resgid
, Opt_resuid
, Opt_sb
, Opt_err_cont
, Opt_err_panic
,
325 Opt_err_ro
, Opt_nouid32
, Opt_nocheck
, Opt_debug
,
326 Opt_oldalloc
, Opt_orlov
, Opt_nobh
, Opt_user_xattr
, Opt_nouser_xattr
,
327 Opt_acl
, Opt_noacl
, Opt_xip
, Opt_ignore
, Opt_err
, Opt_quota
,
328 Opt_usrquota
, Opt_grpquota
331 static match_table_t tokens
= {
332 {Opt_bsd_df
, "bsddf"},
333 {Opt_minix_df
, "minixdf"},
334 {Opt_grpid
, "grpid"},
335 {Opt_grpid
, "bsdgroups"},
336 {Opt_nogrpid
, "nogrpid"},
337 {Opt_nogrpid
, "sysvgroups"},
338 {Opt_resgid
, "resgid=%u"},
339 {Opt_resuid
, "resuid=%u"},
341 {Opt_err_cont
, "errors=continue"},
342 {Opt_err_panic
, "errors=panic"},
343 {Opt_err_ro
, "errors=remount-ro"},
344 {Opt_nouid32
, "nouid32"},
345 {Opt_nocheck
, "check=none"},
346 {Opt_nocheck
, "nocheck"},
347 {Opt_debug
, "debug"},
348 {Opt_oldalloc
, "oldalloc"},
349 {Opt_orlov
, "orlov"},
351 {Opt_user_xattr
, "user_xattr"},
352 {Opt_nouser_xattr
, "nouser_xattr"},
354 {Opt_noacl
, "noacl"},
356 {Opt_grpquota
, "grpquota"},
357 {Opt_ignore
, "noquota"},
358 {Opt_quota
, "quota"},
359 {Opt_usrquota
, "usrquota"},
363 static int parse_options (char * options
,
364 struct ext2_sb_info
*sbi
)
367 substring_t args
[MAX_OPT_ARGS
];
368 unsigned long kind
= EXT2_MOUNT_ERRORS_CONT
;
374 while ((p
= strsep (&options
, ",")) != NULL
) {
379 token
= match_token(p
, tokens
, args
);
382 clear_opt (sbi
->s_mount_opt
, MINIX_DF
);
385 set_opt (sbi
->s_mount_opt
, MINIX_DF
);
388 set_opt (sbi
->s_mount_opt
, GRPID
);
391 clear_opt (sbi
->s_mount_opt
, GRPID
);
394 if (match_int(&args
[0], &option
))
396 sbi
->s_resuid
= option
;
399 if (match_int(&args
[0], &option
))
401 sbi
->s_resgid
= option
;
404 /* handled by get_sb_block() instead of here */
405 /* *sb_block = match_int(&args[0]); */
408 kind
= EXT2_MOUNT_ERRORS_PANIC
;
411 kind
= EXT2_MOUNT_ERRORS_RO
;
414 kind
= EXT2_MOUNT_ERRORS_CONT
;
417 set_opt (sbi
->s_mount_opt
, NO_UID32
);
420 clear_opt (sbi
->s_mount_opt
, CHECK
);
423 set_opt (sbi
->s_mount_opt
, DEBUG
);
426 set_opt (sbi
->s_mount_opt
, OLDALLOC
);
429 clear_opt (sbi
->s_mount_opt
, OLDALLOC
);
432 set_opt (sbi
->s_mount_opt
, NOBH
);
434 #ifdef CONFIG_EXT2_FS_XATTR
436 set_opt (sbi
->s_mount_opt
, XATTR_USER
);
438 case Opt_nouser_xattr
:
439 clear_opt (sbi
->s_mount_opt
, XATTR_USER
);
443 case Opt_nouser_xattr
:
444 printk("EXT2 (no)user_xattr options not supported\n");
447 #ifdef CONFIG_EXT2_FS_POSIX_ACL
449 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
452 clear_opt(sbi
->s_mount_opt
, POSIX_ACL
);
457 printk("EXT2 (no)acl options not supported\n");
461 #ifdef CONFIG_EXT2_FS_XIP
462 set_opt (sbi
->s_mount_opt
, XIP
);
464 printk("EXT2 xip option not supported\n");
468 #if defined(CONFIG_QUOTA)
471 set_opt(sbi
->s_mount_opt
, USRQUOTA
);
475 set_opt(sbi
->s_mount_opt
, GRPQUOTA
);
482 "EXT2-fs: quota operations not supported.\n");
493 sbi
->s_mount_opt
|= kind
;
497 static int ext2_setup_super (struct super_block
* sb
,
498 struct ext2_super_block
* es
,
502 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
504 if (le32_to_cpu(es
->s_rev_level
) > EXT2_MAX_SUPP_REV
) {
505 printk ("EXT2-fs warning: revision level too high, "
506 "forcing read-only mode\n");
511 if (!(sbi
->s_mount_state
& EXT2_VALID_FS
))
512 printk ("EXT2-fs warning: mounting unchecked fs, "
513 "running e2fsck is recommended\n");
514 else if ((sbi
->s_mount_state
& EXT2_ERROR_FS
))
515 printk ("EXT2-fs warning: mounting fs with errors, "
516 "running e2fsck is recommended\n");
517 else if ((__s16
) le16_to_cpu(es
->s_max_mnt_count
) >= 0 &&
518 le16_to_cpu(es
->s_mnt_count
) >=
519 (unsigned short) (__s16
) le16_to_cpu(es
->s_max_mnt_count
))
520 printk ("EXT2-fs warning: maximal mount count reached, "
521 "running e2fsck is recommended\n");
522 else if (le32_to_cpu(es
->s_checkinterval
) &&
523 (le32_to_cpu(es
->s_lastcheck
) + le32_to_cpu(es
->s_checkinterval
) <= get_seconds()))
524 printk ("EXT2-fs warning: checktime reached, "
525 "running e2fsck is recommended\n");
526 if (!le16_to_cpu(es
->s_max_mnt_count
))
527 es
->s_max_mnt_count
= cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT
);
528 es
->s_mnt_count
=cpu_to_le16(le16_to_cpu(es
->s_mnt_count
) + 1);
529 ext2_write_super(sb
);
530 if (test_opt (sb
, DEBUG
))
531 printk ("[EXT II FS %s, %s, bs=%lu, fs=%lu, gc=%lu, "
532 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
533 EXT2FS_VERSION
, EXT2FS_DATE
, sb
->s_blocksize
,
536 EXT2_BLOCKS_PER_GROUP(sb
),
537 EXT2_INODES_PER_GROUP(sb
),
542 static int ext2_check_descriptors (struct super_block
* sb
)
546 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
547 unsigned long first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
);
548 unsigned long last_block
;
549 struct ext2_group_desc
* gdp
= NULL
;
551 ext2_debug ("Checking group descriptors");
553 for (i
= 0; i
< sbi
->s_groups_count
; i
++)
555 if (i
== sbi
->s_groups_count
- 1)
556 last_block
= le32_to_cpu(sbi
->s_es
->s_blocks_count
) - 1;
558 last_block
= first_block
+
559 (EXT2_BLOCKS_PER_GROUP(sb
) - 1);
561 if ((i
% EXT2_DESC_PER_BLOCK(sb
)) == 0)
562 gdp
= (struct ext2_group_desc
*) sbi
->s_group_desc
[desc_block
++]->b_data
;
563 if (le32_to_cpu(gdp
->bg_block_bitmap
) < first_block
||
564 le32_to_cpu(gdp
->bg_block_bitmap
) > last_block
)
566 ext2_error (sb
, "ext2_check_descriptors",
567 "Block bitmap for group %d"
568 " not in group (block %lu)!",
569 i
, (unsigned long) le32_to_cpu(gdp
->bg_block_bitmap
));
572 if (le32_to_cpu(gdp
->bg_inode_bitmap
) < first_block
||
573 le32_to_cpu(gdp
->bg_inode_bitmap
) > last_block
)
575 ext2_error (sb
, "ext2_check_descriptors",
576 "Inode bitmap for group %d"
577 " not in group (block %lu)!",
578 i
, (unsigned long) le32_to_cpu(gdp
->bg_inode_bitmap
));
581 if (le32_to_cpu(gdp
->bg_inode_table
) < first_block
||
582 le32_to_cpu(gdp
->bg_inode_table
) + sbi
->s_itb_per_group
>
585 ext2_error (sb
, "ext2_check_descriptors",
586 "Inode table for group %d"
587 " not in group (block %lu)!",
588 i
, (unsigned long) le32_to_cpu(gdp
->bg_inode_table
));
591 first_block
+= EXT2_BLOCKS_PER_GROUP(sb
);
597 #define log2(n) ffz(~(n))
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
= kmalloc(sizeof(*sbi
), GFP_KERNEL
);
662 memset(sbi
, 0, sizeof(*sbi
));
665 * See what the current blocksize for the device is, and
666 * use that as the blocksize. Otherwise (or if the blocksize
667 * is smaller than the default) use the default.
668 * This is important for devices that have a hardware
669 * sectorsize that is larger than the default.
671 blocksize
= sb_min_blocksize(sb
, BLOCK_SIZE
);
673 printk ("EXT2-fs: unable to set blocksize\n");
678 * If the superblock doesn't start on a hardware sector boundary,
679 * calculate the offset.
681 if (blocksize
!= BLOCK_SIZE
) {
682 logic_sb_block
= (sb_block
*BLOCK_SIZE
) / blocksize
;
683 offset
= (sb_block
*BLOCK_SIZE
) % blocksize
;
685 logic_sb_block
= sb_block
;
688 if (!(bh
= sb_bread(sb
, logic_sb_block
))) {
689 printk ("EXT2-fs: unable to read superblock\n");
693 * Note: s_es must be initialized as soon as possible because
694 * some ext2 macro-instructions depend on its value
696 es
= (struct ext2_super_block
*) (((char *)bh
->b_data
) + offset
);
698 sb
->s_magic
= le16_to_cpu(es
->s_magic
);
700 if (sb
->s_magic
!= EXT2_SUPER_MAGIC
)
703 /* Set defaults before we parse the mount options */
704 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
705 if (def_mount_opts
& EXT2_DEFM_DEBUG
)
706 set_opt(sbi
->s_mount_opt
, DEBUG
);
707 if (def_mount_opts
& EXT2_DEFM_BSDGROUPS
)
708 set_opt(sbi
->s_mount_opt
, GRPID
);
709 if (def_mount_opts
& EXT2_DEFM_UID16
)
710 set_opt(sbi
->s_mount_opt
, NO_UID32
);
711 if (def_mount_opts
& EXT2_DEFM_XATTR_USER
)
712 set_opt(sbi
->s_mount_opt
, XATTR_USER
);
713 if (def_mount_opts
& EXT2_DEFM_ACL
)
714 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
716 if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT2_ERRORS_PANIC
)
717 set_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
718 else if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT2_ERRORS_RO
)
719 set_opt(sbi
->s_mount_opt
, ERRORS_RO
);
721 sbi
->s_resuid
= le16_to_cpu(es
->s_def_resuid
);
722 sbi
->s_resgid
= le16_to_cpu(es
->s_def_resgid
);
724 if (!parse_options ((char *) data
, sbi
))
727 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
728 ((EXT2_SB(sb
)->s_mount_opt
& EXT2_MOUNT_POSIX_ACL
) ?
731 ext2_xip_verify_sb(sb
); /* see if bdev supports xip, unset
732 EXT2_MOUNT_XIP if not */
734 if (le32_to_cpu(es
->s_rev_level
) == EXT2_GOOD_OLD_REV
&&
735 (EXT2_HAS_COMPAT_FEATURE(sb
, ~0U) ||
736 EXT2_HAS_RO_COMPAT_FEATURE(sb
, ~0U) ||
737 EXT2_HAS_INCOMPAT_FEATURE(sb
, ~0U)))
738 printk("EXT2-fs warning: feature flags set on rev 0 fs, "
739 "running e2fsck is recommended\n");
741 * Check feature flags regardless of the revision level, since we
742 * previously didn't change the revision level when setting the flags,
743 * so there is a chance incompat flags are set on a rev 0 filesystem.
745 features
= EXT2_HAS_INCOMPAT_FEATURE(sb
, ~EXT2_FEATURE_INCOMPAT_SUPP
);
747 printk("EXT2-fs: %s: couldn't mount because of "
748 "unsupported optional features (%x).\n",
749 sb
->s_id
, le32_to_cpu(features
));
752 if (!(sb
->s_flags
& MS_RDONLY
) &&
753 (features
= EXT2_HAS_RO_COMPAT_FEATURE(sb
, ~EXT2_FEATURE_RO_COMPAT_SUPP
))){
754 printk("EXT2-fs: %s: couldn't mount RDWR because of "
755 "unsupported optional features (%x).\n",
756 sb
->s_id
, le32_to_cpu(features
));
760 blocksize
= BLOCK_SIZE
<< le32_to_cpu(sbi
->s_es
->s_log_block_size
);
762 if ((ext2_use_xip(sb
)) && ((blocksize
!= PAGE_SIZE
) ||
763 (sb
->s_blocksize
!= blocksize
))) {
765 printk("XIP: Unsupported blocksize\n");
769 /* If the blocksize doesn't match, re-read the thing.. */
770 if (sb
->s_blocksize
!= blocksize
) {
773 if (!sb_set_blocksize(sb
, blocksize
)) {
774 printk(KERN_ERR
"EXT2-fs: blocksize too small for device.\n");
778 logic_sb_block
= (sb_block
*BLOCK_SIZE
) / blocksize
;
779 offset
= (sb_block
*BLOCK_SIZE
) % blocksize
;
780 bh
= sb_bread(sb
, logic_sb_block
);
782 printk("EXT2-fs: Couldn't read superblock on "
786 es
= (struct ext2_super_block
*) (((char *)bh
->b_data
) + offset
);
788 if (es
->s_magic
!= cpu_to_le16(EXT2_SUPER_MAGIC
)) {
789 printk ("EXT2-fs: Magic mismatch, very weird !\n");
794 sb
->s_maxbytes
= ext2_max_size(sb
->s_blocksize_bits
);
796 if (le32_to_cpu(es
->s_rev_level
) == EXT2_GOOD_OLD_REV
) {
797 sbi
->s_inode_size
= EXT2_GOOD_OLD_INODE_SIZE
;
798 sbi
->s_first_ino
= EXT2_GOOD_OLD_FIRST_INO
;
800 sbi
->s_inode_size
= le16_to_cpu(es
->s_inode_size
);
801 sbi
->s_first_ino
= le32_to_cpu(es
->s_first_ino
);
802 if ((sbi
->s_inode_size
< EXT2_GOOD_OLD_INODE_SIZE
) ||
803 (sbi
->s_inode_size
& (sbi
->s_inode_size
- 1)) ||
804 (sbi
->s_inode_size
> blocksize
)) {
805 printk ("EXT2-fs: unsupported inode size: %d\n",
811 sbi
->s_frag_size
= EXT2_MIN_FRAG_SIZE
<<
812 le32_to_cpu(es
->s_log_frag_size
);
813 if (sbi
->s_frag_size
== 0)
815 sbi
->s_frags_per_block
= sb
->s_blocksize
/ sbi
->s_frag_size
;
817 sbi
->s_blocks_per_group
= le32_to_cpu(es
->s_blocks_per_group
);
818 sbi
->s_frags_per_group
= le32_to_cpu(es
->s_frags_per_group
);
819 sbi
->s_inodes_per_group
= le32_to_cpu(es
->s_inodes_per_group
);
821 if (EXT2_INODE_SIZE(sb
) == 0)
823 sbi
->s_inodes_per_block
= sb
->s_blocksize
/ EXT2_INODE_SIZE(sb
);
824 if (sbi
->s_inodes_per_block
== 0 || sbi
->s_inodes_per_group
== 0)
826 sbi
->s_itb_per_group
= sbi
->s_inodes_per_group
/
827 sbi
->s_inodes_per_block
;
828 sbi
->s_desc_per_block
= sb
->s_blocksize
/
829 sizeof (struct ext2_group_desc
);
831 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
832 sbi
->s_addr_per_block_bits
=
833 log2 (EXT2_ADDR_PER_BLOCK(sb
));
834 sbi
->s_desc_per_block_bits
=
835 log2 (EXT2_DESC_PER_BLOCK(sb
));
837 if (sb
->s_magic
!= EXT2_SUPER_MAGIC
)
840 if (sb
->s_blocksize
!= bh
->b_size
) {
842 printk ("VFS: Unsupported blocksize on dev "
847 if (sb
->s_blocksize
!= sbi
->s_frag_size
) {
848 printk ("EXT2-fs: fragsize %lu != blocksize %lu (not supported yet)\n",
849 sbi
->s_frag_size
, sb
->s_blocksize
);
853 if (sbi
->s_blocks_per_group
> sb
->s_blocksize
* 8) {
854 printk ("EXT2-fs: #blocks per group too big: %lu\n",
855 sbi
->s_blocks_per_group
);
858 if (sbi
->s_frags_per_group
> sb
->s_blocksize
* 8) {
859 printk ("EXT2-fs: #fragments per group too big: %lu\n",
860 sbi
->s_frags_per_group
);
863 if (sbi
->s_inodes_per_group
> sb
->s_blocksize
* 8) {
864 printk ("EXT2-fs: #inodes per group too big: %lu\n",
865 sbi
->s_inodes_per_group
);
869 if (EXT2_BLOCKS_PER_GROUP(sb
) == 0)
871 sbi
->s_groups_count
= ((le32_to_cpu(es
->s_blocks_count
) -
872 le32_to_cpu(es
->s_first_data_block
) - 1)
873 / EXT2_BLOCKS_PER_GROUP(sb
)) + 1;
874 db_count
= (sbi
->s_groups_count
+ EXT2_DESC_PER_BLOCK(sb
) - 1) /
875 EXT2_DESC_PER_BLOCK(sb
);
876 sbi
->s_group_desc
= kmalloc (db_count
* sizeof (struct buffer_head
*), GFP_KERNEL
);
877 if (sbi
->s_group_desc
== NULL
) {
878 printk ("EXT2-fs: not enough memory\n");
881 bgl_lock_init(&sbi
->s_blockgroup_lock
);
882 sbi
->s_debts
= kmalloc(sbi
->s_groups_count
* sizeof(*sbi
->s_debts
),
885 printk ("EXT2-fs: not enough memory\n");
886 goto failed_mount_group_desc
;
888 memset(sbi
->s_debts
, 0, sbi
->s_groups_count
* sizeof(*sbi
->s_debts
));
889 for (i
= 0; i
< db_count
; i
++) {
890 block
= descriptor_loc(sb
, logic_sb_block
, i
);
891 sbi
->s_group_desc
[i
] = sb_bread(sb
, block
);
892 if (!sbi
->s_group_desc
[i
]) {
893 for (j
= 0; j
< i
; j
++)
894 brelse (sbi
->s_group_desc
[j
]);
895 printk ("EXT2-fs: unable to read group descriptors\n");
896 goto failed_mount_group_desc
;
899 if (!ext2_check_descriptors (sb
)) {
900 printk ("EXT2-fs: group descriptors corrupted!\n");
903 sbi
->s_gdb_count
= db_count
;
904 get_random_bytes(&sbi
->s_next_generation
, sizeof(u32
));
905 spin_lock_init(&sbi
->s_next_gen_lock
);
907 percpu_counter_init(&sbi
->s_freeblocks_counter
,
908 ext2_count_free_blocks(sb
));
909 percpu_counter_init(&sbi
->s_freeinodes_counter
,
910 ext2_count_free_inodes(sb
));
911 percpu_counter_init(&sbi
->s_dirs_counter
,
912 ext2_count_dirs(sb
));
914 * set up enough so that it can read an inode
916 sb
->s_op
= &ext2_sops
;
917 sb
->s_export_op
= &ext2_export_ops
;
918 sb
->s_xattr
= ext2_xattr_handlers
;
919 root
= iget(sb
, EXT2_ROOT_INO
);
920 sb
->s_root
= d_alloc_root(root
);
923 printk(KERN_ERR
"EXT2-fs: get root inode failed\n");
926 if (!S_ISDIR(root
->i_mode
) || !root
->i_blocks
|| !root
->i_size
) {
929 printk(KERN_ERR
"EXT2-fs: corrupt root inode, run e2fsck\n");
932 if (EXT2_HAS_COMPAT_FEATURE(sb
, EXT3_FEATURE_COMPAT_HAS_JOURNAL
))
933 ext2_warning(sb
, __FUNCTION__
,
934 "mounting ext3 filesystem as ext2");
935 ext2_setup_super (sb
, es
, sb
->s_flags
& MS_RDONLY
);
940 printk("VFS: Can't find an ext2 filesystem on dev %s.\n",
944 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
945 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
946 percpu_counter_destroy(&sbi
->s_dirs_counter
);
948 for (i
= 0; i
< db_count
; i
++)
949 brelse(sbi
->s_group_desc
[i
]);
950 failed_mount_group_desc
:
951 kfree(sbi
->s_group_desc
);
956 sb
->s_fs_info
= NULL
;
961 static void ext2_commit_super (struct super_block
* sb
,
962 struct ext2_super_block
* es
)
964 es
->s_wtime
= cpu_to_le32(get_seconds());
965 mark_buffer_dirty(EXT2_SB(sb
)->s_sbh
);
969 static void ext2_sync_super(struct super_block
*sb
, struct ext2_super_block
*es
)
971 es
->s_free_blocks_count
= cpu_to_le32(ext2_count_free_blocks(sb
));
972 es
->s_free_inodes_count
= cpu_to_le32(ext2_count_free_inodes(sb
));
973 es
->s_wtime
= cpu_to_le32(get_seconds());
974 mark_buffer_dirty(EXT2_SB(sb
)->s_sbh
);
975 sync_dirty_buffer(EXT2_SB(sb
)->s_sbh
);
980 * In the second extended file system, it is not necessary to
981 * write the super block since we use a mapping of the
982 * disk super block in a buffer.
984 * However, this function is still used to set the fs valid
985 * flags to 0. We need to set this flag to 0 since the fs
986 * may have been checked while mounted and e2fsck may have
987 * set s_state to EXT2_VALID_FS after some corrections.
990 void ext2_write_super (struct super_block
* sb
)
992 struct ext2_super_block
* es
;
994 if (!(sb
->s_flags
& MS_RDONLY
)) {
995 es
= EXT2_SB(sb
)->s_es
;
997 if (le16_to_cpu(es
->s_state
) & EXT2_VALID_FS
) {
998 ext2_debug ("setting valid to 0\n");
999 es
->s_state
= cpu_to_le16(le16_to_cpu(es
->s_state
) &
1001 es
->s_free_blocks_count
= cpu_to_le32(ext2_count_free_blocks(sb
));
1002 es
->s_free_inodes_count
= cpu_to_le32(ext2_count_free_inodes(sb
));
1003 es
->s_mtime
= cpu_to_le32(get_seconds());
1004 ext2_sync_super(sb
, es
);
1006 ext2_commit_super (sb
, es
);
1012 static int ext2_remount (struct super_block
* sb
, int * flags
, char * data
)
1014 struct ext2_sb_info
* sbi
= EXT2_SB(sb
);
1015 struct ext2_super_block
* es
;
1016 unsigned long old_mount_opt
= sbi
->s_mount_opt
;
1017 struct ext2_mount_options old_opts
;
1018 unsigned long old_sb_flags
;
1021 /* Store the old options */
1022 old_sb_flags
= sb
->s_flags
;
1023 old_opts
.s_mount_opt
= sbi
->s_mount_opt
;
1024 old_opts
.s_resuid
= sbi
->s_resuid
;
1025 old_opts
.s_resgid
= sbi
->s_resgid
;
1028 * Allow the "check" option to be passed as a remount option.
1030 if (!parse_options (data
, sbi
)) {
1035 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
1036 ((sbi
->s_mount_opt
& EXT2_MOUNT_POSIX_ACL
) ? MS_POSIXACL
: 0);
1039 if (((sbi
->s_mount_opt
& EXT2_MOUNT_XIP
) !=
1040 (old_mount_opt
& EXT2_MOUNT_XIP
)) &&
1041 invalidate_inodes(sb
))
1042 ext2_warning(sb
, __FUNCTION__
, "busy inodes while remounting "\
1043 "xip remain in cache (no functional problem)");
1044 if ((*flags
& MS_RDONLY
) == (sb
->s_flags
& MS_RDONLY
))
1046 if (*flags
& MS_RDONLY
) {
1047 if (le16_to_cpu(es
->s_state
) & EXT2_VALID_FS
||
1048 !(sbi
->s_mount_state
& EXT2_VALID_FS
))
1051 * OK, we are remounting a valid rw partition rdonly, so set
1052 * the rdonly flag and then mark the partition as valid again.
1054 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
1055 es
->s_mtime
= cpu_to_le32(get_seconds());
1057 __le32 ret
= EXT2_HAS_RO_COMPAT_FEATURE(sb
,
1058 ~EXT2_FEATURE_RO_COMPAT_SUPP
);
1060 printk("EXT2-fs: %s: couldn't remount RDWR because of "
1061 "unsupported optional features (%x).\n",
1062 sb
->s_id
, le32_to_cpu(ret
));
1067 * Mounting a RDONLY partition read-write, so reread and
1068 * store the current valid flag. (It may have been changed
1069 * by e2fsck since we originally mounted the partition.)
1071 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
1072 if (!ext2_setup_super (sb
, es
, 0))
1073 sb
->s_flags
&= ~MS_RDONLY
;
1075 ext2_sync_super(sb
, es
);
1078 sbi
->s_mount_opt
= old_opts
.s_mount_opt
;
1079 sbi
->s_resuid
= old_opts
.s_resuid
;
1080 sbi
->s_resgid
= old_opts
.s_resgid
;
1081 sb
->s_flags
= old_sb_flags
;
1085 static int ext2_statfs (struct dentry
* dentry
, struct kstatfs
* buf
)
1087 struct super_block
*sb
= dentry
->d_sb
;
1088 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
1089 unsigned long overhead
;
1092 if (test_opt (sb
, MINIX_DF
))
1096 * Compute the overhead (FS structures)
1100 * All of the blocks before first_data_block are
1103 overhead
= le32_to_cpu(sbi
->s_es
->s_first_data_block
);
1106 * Add the overhead attributed to the superblock and
1107 * block group descriptors. If the sparse superblocks
1108 * feature is turned on, then not all groups have this.
1110 for (i
= 0; i
< sbi
->s_groups_count
; i
++)
1111 overhead
+= ext2_bg_has_super(sb
, i
) +
1112 ext2_bg_num_gdb(sb
, i
);
1115 * Every block group has an inode bitmap, a block
1116 * bitmap, and an inode table.
1118 overhead
+= (sbi
->s_groups_count
*
1119 (2 + sbi
->s_itb_per_group
));
1122 buf
->f_type
= EXT2_SUPER_MAGIC
;
1123 buf
->f_bsize
= sb
->s_blocksize
;
1124 buf
->f_blocks
= le32_to_cpu(sbi
->s_es
->s_blocks_count
) - overhead
;
1125 buf
->f_bfree
= ext2_count_free_blocks(sb
);
1126 buf
->f_bavail
= buf
->f_bfree
- le32_to_cpu(sbi
->s_es
->s_r_blocks_count
);
1127 if (buf
->f_bfree
< le32_to_cpu(sbi
->s_es
->s_r_blocks_count
))
1129 buf
->f_files
= le32_to_cpu(sbi
->s_es
->s_inodes_count
);
1130 buf
->f_ffree
= ext2_count_free_inodes (sb
);
1131 buf
->f_namelen
= EXT2_NAME_LEN
;
1135 static int ext2_get_sb(struct file_system_type
*fs_type
,
1136 int flags
, const char *dev_name
, void *data
, struct vfsmount
*mnt
)
1138 return get_sb_bdev(fs_type
, flags
, dev_name
, data
, ext2_fill_super
, mnt
);
1143 /* Read data from quotafile - avoid pagecache and such because we cannot afford
1144 * acquiring the locks... As quota files are never truncated and quota code
1145 * itself serializes the operations (and noone else should touch the files)
1146 * we don't have to be afraid of races */
1147 static ssize_t
ext2_quota_read(struct super_block
*sb
, int type
, char *data
,
1148 size_t len
, loff_t off
)
1150 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
1151 sector_t blk
= off
>> EXT2_BLOCK_SIZE_BITS(sb
);
1153 int offset
= off
& (sb
->s_blocksize
- 1);
1156 struct buffer_head tmp_bh
;
1157 struct buffer_head
*bh
;
1158 loff_t i_size
= i_size_read(inode
);
1162 if (off
+len
> i_size
)
1165 while (toread
> 0) {
1166 tocopy
= sb
->s_blocksize
- offset
< toread
?
1167 sb
->s_blocksize
- offset
: toread
;
1170 err
= ext2_get_block(inode
, blk
, &tmp_bh
, 0);
1173 if (!buffer_mapped(&tmp_bh
)) /* A hole? */
1174 memset(data
, 0, tocopy
);
1176 bh
= sb_bread(sb
, tmp_bh
.b_blocknr
);
1179 memcpy(data
, bh
->b_data
+offset
, tocopy
);
1190 /* Write to quotafile */
1191 static ssize_t
ext2_quota_write(struct super_block
*sb
, int type
,
1192 const char *data
, size_t len
, loff_t off
)
1194 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
1195 sector_t blk
= off
>> EXT2_BLOCK_SIZE_BITS(sb
);
1197 int offset
= off
& (sb
->s_blocksize
- 1);
1199 size_t towrite
= len
;
1200 struct buffer_head tmp_bh
;
1201 struct buffer_head
*bh
;
1203 mutex_lock_nested(&inode
->i_mutex
, I_MUTEX_QUOTA
);
1204 while (towrite
> 0) {
1205 tocopy
= sb
->s_blocksize
- offset
< towrite
?
1206 sb
->s_blocksize
- offset
: towrite
;
1209 err
= ext2_get_block(inode
, blk
, &tmp_bh
, 1);
1212 if (offset
|| tocopy
!= EXT2_BLOCK_SIZE(sb
))
1213 bh
= sb_bread(sb
, tmp_bh
.b_blocknr
);
1215 bh
= sb_getblk(sb
, tmp_bh
.b_blocknr
);
1221 memcpy(bh
->b_data
+offset
, data
, tocopy
);
1222 flush_dcache_page(bh
->b_page
);
1223 set_buffer_uptodate(bh
);
1224 mark_buffer_dirty(bh
);
1235 if (inode
->i_size
< off
+len
-towrite
)
1236 i_size_write(inode
, off
+len
-towrite
);
1238 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
1239 mark_inode_dirty(inode
);
1240 mutex_unlock(&inode
->i_mutex
);
1241 return len
- towrite
;
1246 static struct file_system_type ext2_fs_type
= {
1247 .owner
= THIS_MODULE
,
1249 .get_sb
= ext2_get_sb
,
1250 .kill_sb
= kill_block_super
,
1251 .fs_flags
= FS_REQUIRES_DEV
,
1254 static int __init
init_ext2_fs(void)
1256 int err
= init_ext2_xattr();
1259 err
= init_inodecache();
1262 err
= register_filesystem(&ext2_fs_type
);
1267 destroy_inodecache();
1273 static void __exit
exit_ext2_fs(void)
1275 unregister_filesystem(&ext2_fs_type
);
1276 destroy_inodecache();
1280 module_init(init_ext2_fs
)
1281 module_exit(exit_ext2_fs
)