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/vfs.h>
30 #include <linux/seq_file.h>
31 #include <linux/mount.h>
32 #include <linux/log2.h>
33 #include <linux/quotaops.h>
34 #include <asm/uaccess.h>
39 static void ext2_sync_super(struct super_block
*sb
,
40 struct ext2_super_block
*es
, int wait
);
41 static int ext2_remount (struct super_block
* sb
, int * flags
, char * data
);
42 static int ext2_statfs (struct dentry
* dentry
, struct kstatfs
* buf
);
43 static int ext2_sync_fs(struct super_block
*sb
, int wait
);
44 static int ext2_freeze(struct super_block
*sb
);
45 static int ext2_unfreeze(struct super_block
*sb
);
47 void ext2_error(struct super_block
*sb
, const char *function
,
52 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
53 struct ext2_super_block
*es
= sbi
->s_es
;
55 if (!(sb
->s_flags
& MS_RDONLY
)) {
56 spin_lock(&sbi
->s_lock
);
57 sbi
->s_mount_state
|= EXT2_ERROR_FS
;
58 es
->s_state
|= cpu_to_le16(EXT2_ERROR_FS
);
59 spin_unlock(&sbi
->s_lock
);
60 ext2_sync_super(sb
, es
, 1);
68 printk(KERN_CRIT
"EXT2-fs (%s): error: %s: %pV\n",
69 sb
->s_id
, function
, &vaf
);
73 if (test_opt(sb
, ERRORS_PANIC
))
74 panic("EXT2-fs: panic from previous error\n");
75 if (test_opt(sb
, ERRORS_RO
)) {
76 ext2_msg(sb
, KERN_CRIT
,
77 "error: remounting filesystem read-only");
78 sb
->s_flags
|= MS_RDONLY
;
82 void ext2_msg(struct super_block
*sb
, const char *prefix
,
93 printk("%sEXT2-fs (%s): %pV\n", prefix
, sb
->s_id
, &vaf
);
99 * This must be called with sbi->s_lock held.
101 void ext2_update_dynamic_rev(struct super_block
*sb
)
103 struct ext2_super_block
*es
= EXT2_SB(sb
)->s_es
;
105 if (le32_to_cpu(es
->s_rev_level
) > EXT2_GOOD_OLD_REV
)
108 ext2_msg(sb
, KERN_WARNING
,
109 "warning: updating to rev %d because of "
110 "new feature flag, running e2fsck is recommended",
113 es
->s_first_ino
= cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO
);
114 es
->s_inode_size
= cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE
);
115 es
->s_rev_level
= cpu_to_le32(EXT2_DYNAMIC_REV
);
116 /* leave es->s_feature_*compat flags alone */
117 /* es->s_uuid will be set by e2fsck if empty */
120 * The rest of the superblock fields should be zero, and if not it
121 * means they are likely already in use, so leave them alone. We
122 * can leave it up to e2fsck to clean up any inconsistencies there.
126 static void ext2_put_super (struct super_block
* sb
)
130 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
132 dquot_disable(sb
, -1, DQUOT_USAGE_ENABLED
| DQUOT_LIMITS_ENABLED
);
134 ext2_xattr_put_super(sb
);
135 if (!(sb
->s_flags
& MS_RDONLY
)) {
136 struct ext2_super_block
*es
= sbi
->s_es
;
138 spin_lock(&sbi
->s_lock
);
139 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
140 spin_unlock(&sbi
->s_lock
);
141 ext2_sync_super(sb
, es
, 1);
143 db_count
= sbi
->s_gdb_count
;
144 for (i
= 0; i
< db_count
; i
++)
145 if (sbi
->s_group_desc
[i
])
146 brelse (sbi
->s_group_desc
[i
]);
147 kfree(sbi
->s_group_desc
);
149 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
150 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
151 percpu_counter_destroy(&sbi
->s_dirs_counter
);
153 sb
->s_fs_info
= NULL
;
154 kfree(sbi
->s_blockgroup_lock
);
158 static struct kmem_cache
* ext2_inode_cachep
;
160 static struct inode
*ext2_alloc_inode(struct super_block
*sb
)
162 struct ext2_inode_info
*ei
;
163 ei
= kmem_cache_alloc(ext2_inode_cachep
, GFP_KERNEL
);
166 ei
->i_block_alloc_info
= NULL
;
167 ei
->vfs_inode
.i_version
= 1;
169 memset(&ei
->i_dquot
, 0, sizeof(ei
->i_dquot
));
172 return &ei
->vfs_inode
;
175 static void ext2_i_callback(struct rcu_head
*head
)
177 struct inode
*inode
= container_of(head
, struct inode
, i_rcu
);
178 kmem_cache_free(ext2_inode_cachep
, EXT2_I(inode
));
181 static void ext2_destroy_inode(struct inode
*inode
)
183 call_rcu(&inode
->i_rcu
, ext2_i_callback
);
186 static void init_once(void *foo
)
188 struct ext2_inode_info
*ei
= (struct ext2_inode_info
*) foo
;
190 rwlock_init(&ei
->i_meta_lock
);
191 #ifdef CONFIG_EXT2_FS_XATTR
192 init_rwsem(&ei
->xattr_sem
);
194 mutex_init(&ei
->truncate_mutex
);
196 init_rwsem(&ei
->dax_sem
);
198 inode_init_once(&ei
->vfs_inode
);
201 static int __init
init_inodecache(void)
203 ext2_inode_cachep
= kmem_cache_create("ext2_inode_cache",
204 sizeof(struct ext2_inode_info
),
205 0, (SLAB_RECLAIM_ACCOUNT
|
208 if (ext2_inode_cachep
== NULL
)
213 static void destroy_inodecache(void)
216 * Make sure all delayed rcu free inodes are flushed before we
220 kmem_cache_destroy(ext2_inode_cachep
);
223 static int ext2_show_options(struct seq_file
*seq
, struct dentry
*root
)
225 struct super_block
*sb
= root
->d_sb
;
226 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
227 struct ext2_super_block
*es
= sbi
->s_es
;
228 unsigned long def_mount_opts
;
230 spin_lock(&sbi
->s_lock
);
231 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
233 if (sbi
->s_sb_block
!= 1)
234 seq_printf(seq
, ",sb=%lu", sbi
->s_sb_block
);
235 if (test_opt(sb
, MINIX_DF
))
236 seq_puts(seq
, ",minixdf");
237 if (test_opt(sb
, GRPID
))
238 seq_puts(seq
, ",grpid");
239 if (!test_opt(sb
, GRPID
) && (def_mount_opts
& EXT2_DEFM_BSDGROUPS
))
240 seq_puts(seq
, ",nogrpid");
241 if (!uid_eq(sbi
->s_resuid
, make_kuid(&init_user_ns
, EXT2_DEF_RESUID
)) ||
242 le16_to_cpu(es
->s_def_resuid
) != EXT2_DEF_RESUID
) {
243 seq_printf(seq
, ",resuid=%u",
244 from_kuid_munged(&init_user_ns
, sbi
->s_resuid
));
246 if (!gid_eq(sbi
->s_resgid
, make_kgid(&init_user_ns
, EXT2_DEF_RESGID
)) ||
247 le16_to_cpu(es
->s_def_resgid
) != EXT2_DEF_RESGID
) {
248 seq_printf(seq
, ",resgid=%u",
249 from_kgid_munged(&init_user_ns
, sbi
->s_resgid
));
251 if (test_opt(sb
, ERRORS_RO
)) {
252 int def_errors
= le16_to_cpu(es
->s_errors
);
254 if (def_errors
== EXT2_ERRORS_PANIC
||
255 def_errors
== EXT2_ERRORS_CONTINUE
) {
256 seq_puts(seq
, ",errors=remount-ro");
259 if (test_opt(sb
, ERRORS_CONT
))
260 seq_puts(seq
, ",errors=continue");
261 if (test_opt(sb
, ERRORS_PANIC
))
262 seq_puts(seq
, ",errors=panic");
263 if (test_opt(sb
, NO_UID32
))
264 seq_puts(seq
, ",nouid32");
265 if (test_opt(sb
, DEBUG
))
266 seq_puts(seq
, ",debug");
267 if (test_opt(sb
, OLDALLOC
))
268 seq_puts(seq
, ",oldalloc");
270 #ifdef CONFIG_EXT2_FS_XATTR
271 if (test_opt(sb
, XATTR_USER
))
272 seq_puts(seq
, ",user_xattr");
273 if (!test_opt(sb
, XATTR_USER
) &&
274 (def_mount_opts
& EXT2_DEFM_XATTR_USER
)) {
275 seq_puts(seq
, ",nouser_xattr");
279 #ifdef CONFIG_EXT2_FS_POSIX_ACL
280 if (test_opt(sb
, POSIX_ACL
))
281 seq_puts(seq
, ",acl");
282 if (!test_opt(sb
, POSIX_ACL
) && (def_mount_opts
& EXT2_DEFM_ACL
))
283 seq_puts(seq
, ",noacl");
286 if (test_opt(sb
, NOBH
))
287 seq_puts(seq
, ",nobh");
289 #if defined(CONFIG_QUOTA)
290 if (sbi
->s_mount_opt
& EXT2_MOUNT_USRQUOTA
)
291 seq_puts(seq
, ",usrquota");
293 if (sbi
->s_mount_opt
& EXT2_MOUNT_GRPQUOTA
)
294 seq_puts(seq
, ",grpquota");
298 if (sbi
->s_mount_opt
& EXT2_MOUNT_XIP
)
299 seq_puts(seq
, ",xip");
300 if (sbi
->s_mount_opt
& EXT2_MOUNT_DAX
)
301 seq_puts(seq
, ",dax");
304 if (!test_opt(sb
, RESERVATION
))
305 seq_puts(seq
, ",noreservation");
307 spin_unlock(&sbi
->s_lock
);
312 static ssize_t
ext2_quota_read(struct super_block
*sb
, int type
, char *data
, size_t len
, loff_t off
);
313 static ssize_t
ext2_quota_write(struct super_block
*sb
, int type
, const char *data
, size_t len
, loff_t off
);
314 static struct dquot
**ext2_get_dquots(struct inode
*inode
)
316 return EXT2_I(inode
)->i_dquot
;
320 static const struct super_operations ext2_sops
= {
321 .alloc_inode
= ext2_alloc_inode
,
322 .destroy_inode
= ext2_destroy_inode
,
323 .write_inode
= ext2_write_inode
,
324 .evict_inode
= ext2_evict_inode
,
325 .put_super
= ext2_put_super
,
326 .sync_fs
= ext2_sync_fs
,
327 .freeze_fs
= ext2_freeze
,
328 .unfreeze_fs
= ext2_unfreeze
,
329 .statfs
= ext2_statfs
,
330 .remount_fs
= ext2_remount
,
331 .show_options
= ext2_show_options
,
333 .quota_read
= ext2_quota_read
,
334 .quota_write
= ext2_quota_write
,
335 .get_dquots
= ext2_get_dquots
,
339 static struct inode
*ext2_nfs_get_inode(struct super_block
*sb
,
340 u64 ino
, u32 generation
)
344 if (ino
< EXT2_FIRST_INO(sb
) && ino
!= EXT2_ROOT_INO
)
345 return ERR_PTR(-ESTALE
);
346 if (ino
> le32_to_cpu(EXT2_SB(sb
)->s_es
->s_inodes_count
))
347 return ERR_PTR(-ESTALE
);
350 * ext2_iget isn't quite right if the inode is currently unallocated!
351 * However ext2_iget currently does appropriate checks to handle stale
352 * inodes so everything is OK.
354 inode
= ext2_iget(sb
, ino
);
356 return ERR_CAST(inode
);
357 if (generation
&& inode
->i_generation
!= generation
) {
358 /* we didn't find the right inode.. */
360 return ERR_PTR(-ESTALE
);
365 static struct dentry
*ext2_fh_to_dentry(struct super_block
*sb
, struct fid
*fid
,
366 int fh_len
, int fh_type
)
368 return generic_fh_to_dentry(sb
, fid
, fh_len
, fh_type
,
372 static struct dentry
*ext2_fh_to_parent(struct super_block
*sb
, struct fid
*fid
,
373 int fh_len
, int fh_type
)
375 return generic_fh_to_parent(sb
, fid
, fh_len
, fh_type
,
379 static const struct export_operations ext2_export_ops
= {
380 .fh_to_dentry
= ext2_fh_to_dentry
,
381 .fh_to_parent
= ext2_fh_to_parent
,
382 .get_parent
= ext2_get_parent
,
385 static unsigned long get_sb_block(void **data
)
387 unsigned long sb_block
;
388 char *options
= (char *) *data
;
390 if (!options
|| strncmp(options
, "sb=", 3) != 0)
391 return 1; /* Default location */
393 sb_block
= simple_strtoul(options
, &options
, 0);
394 if (*options
&& *options
!= ',') {
395 printk("EXT2-fs: Invalid sb specification: %s\n",
401 *data
= (void *) options
;
406 Opt_bsd_df
, Opt_minix_df
, Opt_grpid
, Opt_nogrpid
,
407 Opt_resgid
, Opt_resuid
, Opt_sb
, Opt_err_cont
, Opt_err_panic
,
408 Opt_err_ro
, Opt_nouid32
, Opt_nocheck
, Opt_debug
,
409 Opt_oldalloc
, Opt_orlov
, Opt_nobh
, Opt_user_xattr
, Opt_nouser_xattr
,
410 Opt_acl
, Opt_noacl
, Opt_xip
, Opt_dax
, Opt_ignore
, Opt_err
, Opt_quota
,
411 Opt_usrquota
, Opt_grpquota
, Opt_reservation
, Opt_noreservation
414 static const match_table_t tokens
= {
415 {Opt_bsd_df
, "bsddf"},
416 {Opt_minix_df
, "minixdf"},
417 {Opt_grpid
, "grpid"},
418 {Opt_grpid
, "bsdgroups"},
419 {Opt_nogrpid
, "nogrpid"},
420 {Opt_nogrpid
, "sysvgroups"},
421 {Opt_resgid
, "resgid=%u"},
422 {Opt_resuid
, "resuid=%u"},
424 {Opt_err_cont
, "errors=continue"},
425 {Opt_err_panic
, "errors=panic"},
426 {Opt_err_ro
, "errors=remount-ro"},
427 {Opt_nouid32
, "nouid32"},
428 {Opt_nocheck
, "check=none"},
429 {Opt_nocheck
, "nocheck"},
430 {Opt_debug
, "debug"},
431 {Opt_oldalloc
, "oldalloc"},
432 {Opt_orlov
, "orlov"},
434 {Opt_user_xattr
, "user_xattr"},
435 {Opt_nouser_xattr
, "nouser_xattr"},
437 {Opt_noacl
, "noacl"},
440 {Opt_grpquota
, "grpquota"},
441 {Opt_ignore
, "noquota"},
442 {Opt_quota
, "quota"},
443 {Opt_usrquota
, "usrquota"},
444 {Opt_reservation
, "reservation"},
445 {Opt_noreservation
, "noreservation"},
449 static int parse_options(char *options
, struct super_block
*sb
)
452 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
453 substring_t args
[MAX_OPT_ARGS
];
461 while ((p
= strsep (&options
, ",")) != NULL
) {
466 token
= match_token(p
, tokens
, args
);
469 clear_opt (sbi
->s_mount_opt
, MINIX_DF
);
472 set_opt (sbi
->s_mount_opt
, MINIX_DF
);
475 set_opt (sbi
->s_mount_opt
, GRPID
);
478 clear_opt (sbi
->s_mount_opt
, GRPID
);
481 if (match_int(&args
[0], &option
))
483 uid
= make_kuid(current_user_ns(), option
);
484 if (!uid_valid(uid
)) {
485 ext2_msg(sb
, KERN_ERR
, "Invalid uid value %d", option
);
492 if (match_int(&args
[0], &option
))
494 gid
= make_kgid(current_user_ns(), option
);
495 if (!gid_valid(gid
)) {
496 ext2_msg(sb
, KERN_ERR
, "Invalid gid value %d", option
);
502 /* handled by get_sb_block() instead of here */
503 /* *sb_block = match_int(&args[0]); */
506 clear_opt (sbi
->s_mount_opt
, ERRORS_CONT
);
507 clear_opt (sbi
->s_mount_opt
, ERRORS_RO
);
508 set_opt (sbi
->s_mount_opt
, ERRORS_PANIC
);
511 clear_opt (sbi
->s_mount_opt
, ERRORS_CONT
);
512 clear_opt (sbi
->s_mount_opt
, ERRORS_PANIC
);
513 set_opt (sbi
->s_mount_opt
, ERRORS_RO
);
516 clear_opt (sbi
->s_mount_opt
, ERRORS_RO
);
517 clear_opt (sbi
->s_mount_opt
, ERRORS_PANIC
);
518 set_opt (sbi
->s_mount_opt
, ERRORS_CONT
);
521 set_opt (sbi
->s_mount_opt
, NO_UID32
);
524 clear_opt (sbi
->s_mount_opt
, CHECK
);
527 set_opt (sbi
->s_mount_opt
, DEBUG
);
530 set_opt (sbi
->s_mount_opt
, OLDALLOC
);
533 clear_opt (sbi
->s_mount_opt
, OLDALLOC
);
536 set_opt (sbi
->s_mount_opt
, NOBH
);
538 #ifdef CONFIG_EXT2_FS_XATTR
540 set_opt (sbi
->s_mount_opt
, XATTR_USER
);
542 case Opt_nouser_xattr
:
543 clear_opt (sbi
->s_mount_opt
, XATTR_USER
);
547 case Opt_nouser_xattr
:
548 ext2_msg(sb
, KERN_INFO
, "(no)user_xattr options"
552 #ifdef CONFIG_EXT2_FS_POSIX_ACL
554 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
557 clear_opt(sbi
->s_mount_opt
, POSIX_ACL
);
562 ext2_msg(sb
, KERN_INFO
,
563 "(no)acl options not supported");
567 ext2_msg(sb
, KERN_INFO
, "use dax instead of xip");
568 set_opt(sbi
->s_mount_opt
, XIP
);
572 set_opt(sbi
->s_mount_opt
, DAX
);
574 ext2_msg(sb
, KERN_INFO
, "dax option not supported");
578 #if defined(CONFIG_QUOTA)
581 set_opt(sbi
->s_mount_opt
, USRQUOTA
);
585 set_opt(sbi
->s_mount_opt
, GRPQUOTA
);
591 ext2_msg(sb
, KERN_INFO
,
592 "quota operations not supported");
596 case Opt_reservation
:
597 set_opt(sbi
->s_mount_opt
, RESERVATION
);
598 ext2_msg(sb
, KERN_INFO
, "reservations ON");
600 case Opt_noreservation
:
601 clear_opt(sbi
->s_mount_opt
, RESERVATION
);
602 ext2_msg(sb
, KERN_INFO
, "reservations OFF");
613 static int ext2_setup_super (struct super_block
* sb
,
614 struct ext2_super_block
* es
,
618 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
620 if (le32_to_cpu(es
->s_rev_level
) > EXT2_MAX_SUPP_REV
) {
621 ext2_msg(sb
, KERN_ERR
,
622 "error: revision level too high, "
623 "forcing read-only mode");
628 if (!(sbi
->s_mount_state
& EXT2_VALID_FS
))
629 ext2_msg(sb
, KERN_WARNING
,
630 "warning: mounting unchecked fs, "
631 "running e2fsck is recommended");
632 else if ((sbi
->s_mount_state
& EXT2_ERROR_FS
))
633 ext2_msg(sb
, KERN_WARNING
,
634 "warning: mounting fs with errors, "
635 "running e2fsck is recommended");
636 else if ((__s16
) le16_to_cpu(es
->s_max_mnt_count
) >= 0 &&
637 le16_to_cpu(es
->s_mnt_count
) >=
638 (unsigned short) (__s16
) le16_to_cpu(es
->s_max_mnt_count
))
639 ext2_msg(sb
, KERN_WARNING
,
640 "warning: maximal mount count reached, "
641 "running e2fsck is recommended");
642 else if (le32_to_cpu(es
->s_checkinterval
) &&
643 (le32_to_cpu(es
->s_lastcheck
) +
644 le32_to_cpu(es
->s_checkinterval
) <= get_seconds()))
645 ext2_msg(sb
, KERN_WARNING
,
646 "warning: checktime reached, "
647 "running e2fsck is recommended");
648 if (!le16_to_cpu(es
->s_max_mnt_count
))
649 es
->s_max_mnt_count
= cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT
);
650 le16_add_cpu(&es
->s_mnt_count
, 1);
651 if (test_opt (sb
, DEBUG
))
652 ext2_msg(sb
, KERN_INFO
, "%s, %s, bs=%lu, fs=%lu, gc=%lu, "
653 "bpg=%lu, ipg=%lu, mo=%04lx]",
654 EXT2FS_VERSION
, EXT2FS_DATE
, sb
->s_blocksize
,
657 EXT2_BLOCKS_PER_GROUP(sb
),
658 EXT2_INODES_PER_GROUP(sb
),
663 static int ext2_check_descriptors(struct super_block
*sb
)
666 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
668 ext2_debug ("Checking group descriptors");
670 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
671 struct ext2_group_desc
*gdp
= ext2_get_group_desc(sb
, i
, NULL
);
672 ext2_fsblk_t first_block
= ext2_group_first_block_no(sb
, i
);
673 ext2_fsblk_t last_block
;
675 if (i
== sbi
->s_groups_count
- 1)
676 last_block
= le32_to_cpu(sbi
->s_es
->s_blocks_count
) - 1;
678 last_block
= first_block
+
679 (EXT2_BLOCKS_PER_GROUP(sb
) - 1);
681 if (le32_to_cpu(gdp
->bg_block_bitmap
) < first_block
||
682 le32_to_cpu(gdp
->bg_block_bitmap
) > last_block
)
684 ext2_error (sb
, "ext2_check_descriptors",
685 "Block bitmap for group %d"
686 " not in group (block %lu)!",
687 i
, (unsigned long) le32_to_cpu(gdp
->bg_block_bitmap
));
690 if (le32_to_cpu(gdp
->bg_inode_bitmap
) < first_block
||
691 le32_to_cpu(gdp
->bg_inode_bitmap
) > last_block
)
693 ext2_error (sb
, "ext2_check_descriptors",
694 "Inode bitmap for group %d"
695 " not in group (block %lu)!",
696 i
, (unsigned long) le32_to_cpu(gdp
->bg_inode_bitmap
));
699 if (le32_to_cpu(gdp
->bg_inode_table
) < first_block
||
700 le32_to_cpu(gdp
->bg_inode_table
) + sbi
->s_itb_per_group
- 1 >
703 ext2_error (sb
, "ext2_check_descriptors",
704 "Inode table for group %d"
705 " not in group (block %lu)!",
706 i
, (unsigned long) le32_to_cpu(gdp
->bg_inode_table
));
714 * Maximal file size. There is a direct, and {,double-,triple-}indirect
715 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
716 * We need to be 1 filesystem block less than the 2^32 sector limit.
718 static loff_t
ext2_max_size(int bits
)
720 loff_t res
= EXT2_NDIR_BLOCKS
;
724 /* This is calculated to be the largest file size for a
725 * dense, file such that the total number of
726 * sectors in the file, including data and all indirect blocks,
727 * does not exceed 2^32 -1
728 * __u32 i_blocks representing the total number of
729 * 512 bytes blocks of the file
731 upper_limit
= (1LL << 32) - 1;
733 /* total blocks in file system block size */
734 upper_limit
>>= (bits
- 9);
737 /* indirect blocks */
739 /* double indirect blocks */
740 meta_blocks
+= 1 + (1LL << (bits
-2));
741 /* tripple indirect blocks */
742 meta_blocks
+= 1 + (1LL << (bits
-2)) + (1LL << (2*(bits
-2)));
744 upper_limit
-= meta_blocks
;
745 upper_limit
<<= bits
;
747 res
+= 1LL << (bits
-2);
748 res
+= 1LL << (2*(bits
-2));
749 res
+= 1LL << (3*(bits
-2));
751 if (res
> upper_limit
)
754 if (res
> MAX_LFS_FILESIZE
)
755 res
= MAX_LFS_FILESIZE
;
760 static unsigned long descriptor_loc(struct super_block
*sb
,
761 unsigned long logic_sb_block
,
764 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
765 unsigned long bg
, first_meta_bg
;
768 first_meta_bg
= le32_to_cpu(sbi
->s_es
->s_first_meta_bg
);
770 if (!EXT2_HAS_INCOMPAT_FEATURE(sb
, EXT2_FEATURE_INCOMPAT_META_BG
) ||
772 return (logic_sb_block
+ nr
+ 1);
773 bg
= sbi
->s_desc_per_block
* nr
;
774 if (ext2_bg_has_super(sb
, bg
))
777 return ext2_group_first_block_no(sb
, bg
) + has_super
;
780 static int ext2_fill_super(struct super_block
*sb
, void *data
, int silent
)
782 struct buffer_head
* bh
;
783 struct ext2_sb_info
* sbi
;
784 struct ext2_super_block
* es
;
787 unsigned long sb_block
= get_sb_block(&data
);
788 unsigned long logic_sb_block
;
789 unsigned long offset
= 0;
790 unsigned long def_mount_opts
;
792 int blocksize
= BLOCK_SIZE
;
799 sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
803 sbi
->s_blockgroup_lock
=
804 kzalloc(sizeof(struct blockgroup_lock
), GFP_KERNEL
);
805 if (!sbi
->s_blockgroup_lock
) {
810 sbi
->s_sb_block
= sb_block
;
812 spin_lock_init(&sbi
->s_lock
);
815 * See what the current blocksize for the device is, and
816 * use that as the blocksize. Otherwise (or if the blocksize
817 * is smaller than the default) use the default.
818 * This is important for devices that have a hardware
819 * sectorsize that is larger than the default.
821 blocksize
= sb_min_blocksize(sb
, BLOCK_SIZE
);
823 ext2_msg(sb
, KERN_ERR
, "error: unable to set blocksize");
828 * If the superblock doesn't start on a hardware sector boundary,
829 * calculate the offset.
831 if (blocksize
!= BLOCK_SIZE
) {
832 logic_sb_block
= (sb_block
*BLOCK_SIZE
) / blocksize
;
833 offset
= (sb_block
*BLOCK_SIZE
) % blocksize
;
835 logic_sb_block
= sb_block
;
838 if (!(bh
= sb_bread(sb
, logic_sb_block
))) {
839 ext2_msg(sb
, KERN_ERR
, "error: unable to read superblock");
843 * Note: s_es must be initialized as soon as possible because
844 * some ext2 macro-instructions depend on its value
846 es
= (struct ext2_super_block
*) (((char *)bh
->b_data
) + offset
);
848 sb
->s_magic
= le16_to_cpu(es
->s_magic
);
850 if (sb
->s_magic
!= EXT2_SUPER_MAGIC
)
853 /* Set defaults before we parse the mount options */
854 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
855 if (def_mount_opts
& EXT2_DEFM_DEBUG
)
856 set_opt(sbi
->s_mount_opt
, DEBUG
);
857 if (def_mount_opts
& EXT2_DEFM_BSDGROUPS
)
858 set_opt(sbi
->s_mount_opt
, GRPID
);
859 if (def_mount_opts
& EXT2_DEFM_UID16
)
860 set_opt(sbi
->s_mount_opt
, NO_UID32
);
861 #ifdef CONFIG_EXT2_FS_XATTR
862 if (def_mount_opts
& EXT2_DEFM_XATTR_USER
)
863 set_opt(sbi
->s_mount_opt
, XATTR_USER
);
865 #ifdef CONFIG_EXT2_FS_POSIX_ACL
866 if (def_mount_opts
& EXT2_DEFM_ACL
)
867 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
870 if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT2_ERRORS_PANIC
)
871 set_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
872 else if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT2_ERRORS_CONTINUE
)
873 set_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
875 set_opt(sbi
->s_mount_opt
, ERRORS_RO
);
877 sbi
->s_resuid
= make_kuid(&init_user_ns
, le16_to_cpu(es
->s_def_resuid
));
878 sbi
->s_resgid
= make_kgid(&init_user_ns
, le16_to_cpu(es
->s_def_resgid
));
880 set_opt(sbi
->s_mount_opt
, RESERVATION
);
882 if (!parse_options((char *) data
, sb
))
885 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
886 ((EXT2_SB(sb
)->s_mount_opt
& EXT2_MOUNT_POSIX_ACL
) ?
888 sb
->s_iflags
|= SB_I_CGROUPWB
;
890 if (le32_to_cpu(es
->s_rev_level
) == EXT2_GOOD_OLD_REV
&&
891 (EXT2_HAS_COMPAT_FEATURE(sb
, ~0U) ||
892 EXT2_HAS_RO_COMPAT_FEATURE(sb
, ~0U) ||
893 EXT2_HAS_INCOMPAT_FEATURE(sb
, ~0U)))
894 ext2_msg(sb
, KERN_WARNING
,
895 "warning: feature flags set on rev 0 fs, "
896 "running e2fsck is recommended");
898 * Check feature flags regardless of the revision level, since we
899 * previously didn't change the revision level when setting the flags,
900 * so there is a chance incompat flags are set on a rev 0 filesystem.
902 features
= EXT2_HAS_INCOMPAT_FEATURE(sb
, ~EXT2_FEATURE_INCOMPAT_SUPP
);
904 ext2_msg(sb
, KERN_ERR
, "error: couldn't mount because of "
905 "unsupported optional features (%x)",
906 le32_to_cpu(features
));
909 if (!(sb
->s_flags
& MS_RDONLY
) &&
910 (features
= EXT2_HAS_RO_COMPAT_FEATURE(sb
, ~EXT2_FEATURE_RO_COMPAT_SUPP
))){
911 ext2_msg(sb
, KERN_ERR
, "error: couldn't mount RDWR because of "
912 "unsupported optional features (%x)",
913 le32_to_cpu(features
));
917 blocksize
= BLOCK_SIZE
<< le32_to_cpu(sbi
->s_es
->s_log_block_size
);
919 if (sbi
->s_mount_opt
& EXT2_MOUNT_DAX
) {
920 if (blocksize
!= PAGE_SIZE
) {
921 ext2_msg(sb
, KERN_ERR
,
922 "error: unsupported blocksize for dax");
925 if (!sb
->s_bdev
->bd_disk
->fops
->direct_access
) {
926 ext2_msg(sb
, KERN_ERR
,
927 "error: device does not support dax");
932 /* If the blocksize doesn't match, re-read the thing.. */
933 if (sb
->s_blocksize
!= blocksize
) {
936 if (!sb_set_blocksize(sb
, blocksize
)) {
937 ext2_msg(sb
, KERN_ERR
,
938 "error: bad blocksize %d", blocksize
);
942 logic_sb_block
= (sb_block
*BLOCK_SIZE
) / blocksize
;
943 offset
= (sb_block
*BLOCK_SIZE
) % blocksize
;
944 bh
= sb_bread(sb
, logic_sb_block
);
946 ext2_msg(sb
, KERN_ERR
, "error: couldn't read"
947 "superblock on 2nd try");
950 es
= (struct ext2_super_block
*) (((char *)bh
->b_data
) + offset
);
952 if (es
->s_magic
!= cpu_to_le16(EXT2_SUPER_MAGIC
)) {
953 ext2_msg(sb
, KERN_ERR
, "error: magic mismatch");
958 sb
->s_maxbytes
= ext2_max_size(sb
->s_blocksize_bits
);
959 sb
->s_max_links
= EXT2_LINK_MAX
;
961 if (le32_to_cpu(es
->s_rev_level
) == EXT2_GOOD_OLD_REV
) {
962 sbi
->s_inode_size
= EXT2_GOOD_OLD_INODE_SIZE
;
963 sbi
->s_first_ino
= EXT2_GOOD_OLD_FIRST_INO
;
965 sbi
->s_inode_size
= le16_to_cpu(es
->s_inode_size
);
966 sbi
->s_first_ino
= le32_to_cpu(es
->s_first_ino
);
967 if ((sbi
->s_inode_size
< EXT2_GOOD_OLD_INODE_SIZE
) ||
968 !is_power_of_2(sbi
->s_inode_size
) ||
969 (sbi
->s_inode_size
> blocksize
)) {
970 ext2_msg(sb
, KERN_ERR
,
971 "error: unsupported inode size: %d",
977 sbi
->s_frag_size
= EXT2_MIN_FRAG_SIZE
<<
978 le32_to_cpu(es
->s_log_frag_size
);
979 if (sbi
->s_frag_size
== 0)
981 sbi
->s_frags_per_block
= sb
->s_blocksize
/ sbi
->s_frag_size
;
983 sbi
->s_blocks_per_group
= le32_to_cpu(es
->s_blocks_per_group
);
984 sbi
->s_frags_per_group
= le32_to_cpu(es
->s_frags_per_group
);
985 sbi
->s_inodes_per_group
= le32_to_cpu(es
->s_inodes_per_group
);
987 if (EXT2_INODE_SIZE(sb
) == 0)
989 sbi
->s_inodes_per_block
= sb
->s_blocksize
/ EXT2_INODE_SIZE(sb
);
990 if (sbi
->s_inodes_per_block
== 0 || sbi
->s_inodes_per_group
== 0)
992 sbi
->s_itb_per_group
= sbi
->s_inodes_per_group
/
993 sbi
->s_inodes_per_block
;
994 sbi
->s_desc_per_block
= sb
->s_blocksize
/
995 sizeof (struct ext2_group_desc
);
997 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
998 sbi
->s_addr_per_block_bits
=
999 ilog2 (EXT2_ADDR_PER_BLOCK(sb
));
1000 sbi
->s_desc_per_block_bits
=
1001 ilog2 (EXT2_DESC_PER_BLOCK(sb
));
1003 if (sb
->s_magic
!= EXT2_SUPER_MAGIC
)
1006 if (sb
->s_blocksize
!= bh
->b_size
) {
1008 ext2_msg(sb
, KERN_ERR
, "error: unsupported blocksize");
1012 if (sb
->s_blocksize
!= sbi
->s_frag_size
) {
1013 ext2_msg(sb
, KERN_ERR
,
1014 "error: fragsize %lu != blocksize %lu"
1015 "(not supported yet)",
1016 sbi
->s_frag_size
, sb
->s_blocksize
);
1020 if (sbi
->s_blocks_per_group
> sb
->s_blocksize
* 8) {
1021 ext2_msg(sb
, KERN_ERR
,
1022 "error: #blocks per group too big: %lu",
1023 sbi
->s_blocks_per_group
);
1026 if (sbi
->s_frags_per_group
> sb
->s_blocksize
* 8) {
1027 ext2_msg(sb
, KERN_ERR
,
1028 "error: #fragments per group too big: %lu",
1029 sbi
->s_frags_per_group
);
1032 if (sbi
->s_inodes_per_group
> sb
->s_blocksize
* 8) {
1033 ext2_msg(sb
, KERN_ERR
,
1034 "error: #inodes per group too big: %lu",
1035 sbi
->s_inodes_per_group
);
1039 if (EXT2_BLOCKS_PER_GROUP(sb
) == 0)
1041 sbi
->s_groups_count
= ((le32_to_cpu(es
->s_blocks_count
) -
1042 le32_to_cpu(es
->s_first_data_block
) - 1)
1043 / EXT2_BLOCKS_PER_GROUP(sb
)) + 1;
1044 db_count
= (sbi
->s_groups_count
+ EXT2_DESC_PER_BLOCK(sb
) - 1) /
1045 EXT2_DESC_PER_BLOCK(sb
);
1046 sbi
->s_group_desc
= kmalloc (db_count
* sizeof (struct buffer_head
*), GFP_KERNEL
);
1047 if (sbi
->s_group_desc
== NULL
) {
1048 ext2_msg(sb
, KERN_ERR
, "error: not enough memory");
1051 bgl_lock_init(sbi
->s_blockgroup_lock
);
1052 sbi
->s_debts
= kcalloc(sbi
->s_groups_count
, sizeof(*sbi
->s_debts
), GFP_KERNEL
);
1053 if (!sbi
->s_debts
) {
1054 ext2_msg(sb
, KERN_ERR
, "error: not enough memory");
1055 goto failed_mount_group_desc
;
1057 for (i
= 0; i
< db_count
; i
++) {
1058 block
= descriptor_loc(sb
, logic_sb_block
, i
);
1059 sbi
->s_group_desc
[i
] = sb_bread(sb
, block
);
1060 if (!sbi
->s_group_desc
[i
]) {
1061 for (j
= 0; j
< i
; j
++)
1062 brelse (sbi
->s_group_desc
[j
]);
1063 ext2_msg(sb
, KERN_ERR
,
1064 "error: unable to read group descriptors");
1065 goto failed_mount_group_desc
;
1068 if (!ext2_check_descriptors (sb
)) {
1069 ext2_msg(sb
, KERN_ERR
, "group descriptors corrupted");
1072 sbi
->s_gdb_count
= db_count
;
1073 get_random_bytes(&sbi
->s_next_generation
, sizeof(u32
));
1074 spin_lock_init(&sbi
->s_next_gen_lock
);
1076 /* per fileystem reservation list head & lock */
1077 spin_lock_init(&sbi
->s_rsv_window_lock
);
1078 sbi
->s_rsv_window_root
= RB_ROOT
;
1080 * Add a single, static dummy reservation to the start of the
1081 * reservation window list --- it gives us a placeholder for
1082 * append-at-start-of-list which makes the allocation logic
1085 sbi
->s_rsv_window_head
.rsv_start
= EXT2_RESERVE_WINDOW_NOT_ALLOCATED
;
1086 sbi
->s_rsv_window_head
.rsv_end
= EXT2_RESERVE_WINDOW_NOT_ALLOCATED
;
1087 sbi
->s_rsv_window_head
.rsv_alloc_hit
= 0;
1088 sbi
->s_rsv_window_head
.rsv_goal_size
= 0;
1089 ext2_rsv_window_add(sb
, &sbi
->s_rsv_window_head
);
1091 err
= percpu_counter_init(&sbi
->s_freeblocks_counter
,
1092 ext2_count_free_blocks(sb
), GFP_KERNEL
);
1094 err
= percpu_counter_init(&sbi
->s_freeinodes_counter
,
1095 ext2_count_free_inodes(sb
), GFP_KERNEL
);
1098 err
= percpu_counter_init(&sbi
->s_dirs_counter
,
1099 ext2_count_dirs(sb
), GFP_KERNEL
);
1102 ext2_msg(sb
, KERN_ERR
, "error: insufficient memory");
1106 * set up enough so that it can read an inode
1108 sb
->s_op
= &ext2_sops
;
1109 sb
->s_export_op
= &ext2_export_ops
;
1110 sb
->s_xattr
= ext2_xattr_handlers
;
1113 sb
->dq_op
= &dquot_operations
;
1114 sb
->s_qcop
= &dquot_quotactl_ops
;
1115 sb
->s_quota_types
= QTYPE_MASK_USR
| QTYPE_MASK_GRP
;
1118 root
= ext2_iget(sb
, EXT2_ROOT_INO
);
1120 ret
= PTR_ERR(root
);
1123 if (!S_ISDIR(root
->i_mode
) || !root
->i_blocks
|| !root
->i_size
) {
1125 ext2_msg(sb
, KERN_ERR
, "error: corrupt root inode, run e2fsck");
1129 sb
->s_root
= d_make_root(root
);
1131 ext2_msg(sb
, KERN_ERR
, "error: get root inode failed");
1135 if (EXT2_HAS_COMPAT_FEATURE(sb
, EXT3_FEATURE_COMPAT_HAS_JOURNAL
))
1136 ext2_msg(sb
, KERN_WARNING
,
1137 "warning: mounting ext3 filesystem as ext2");
1138 if (ext2_setup_super (sb
, es
, sb
->s_flags
& MS_RDONLY
))
1139 sb
->s_flags
|= MS_RDONLY
;
1140 ext2_write_super(sb
);
1145 ext2_msg(sb
, KERN_ERR
,
1146 "error: can't find an ext2 filesystem on dev %s.",
1150 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
1151 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
1152 percpu_counter_destroy(&sbi
->s_dirs_counter
);
1154 for (i
= 0; i
< db_count
; i
++)
1155 brelse(sbi
->s_group_desc
[i
]);
1156 failed_mount_group_desc
:
1157 kfree(sbi
->s_group_desc
);
1158 kfree(sbi
->s_debts
);
1162 sb
->s_fs_info
= NULL
;
1163 kfree(sbi
->s_blockgroup_lock
);
1169 static void ext2_clear_super_error(struct super_block
*sb
)
1171 struct buffer_head
*sbh
= EXT2_SB(sb
)->s_sbh
;
1173 if (buffer_write_io_error(sbh
)) {
1175 * Oh, dear. A previous attempt to write the
1176 * superblock failed. This could happen because the
1177 * USB device was yanked out. Or it could happen to
1178 * be a transient write error and maybe the block will
1179 * be remapped. Nothing we can do but to retry the
1180 * write and hope for the best.
1182 ext2_msg(sb
, KERN_ERR
,
1183 "previous I/O error to superblock detected\n");
1184 clear_buffer_write_io_error(sbh
);
1185 set_buffer_uptodate(sbh
);
1189 static void ext2_sync_super(struct super_block
*sb
, struct ext2_super_block
*es
,
1192 ext2_clear_super_error(sb
);
1193 spin_lock(&EXT2_SB(sb
)->s_lock
);
1194 es
->s_free_blocks_count
= cpu_to_le32(ext2_count_free_blocks(sb
));
1195 es
->s_free_inodes_count
= cpu_to_le32(ext2_count_free_inodes(sb
));
1196 es
->s_wtime
= cpu_to_le32(get_seconds());
1197 /* unlock before we do IO */
1198 spin_unlock(&EXT2_SB(sb
)->s_lock
);
1199 mark_buffer_dirty(EXT2_SB(sb
)->s_sbh
);
1201 sync_dirty_buffer(EXT2_SB(sb
)->s_sbh
);
1205 * In the second extended file system, it is not necessary to
1206 * write the super block since we use a mapping of the
1207 * disk super block in a buffer.
1209 * However, this function is still used to set the fs valid
1210 * flags to 0. We need to set this flag to 0 since the fs
1211 * may have been checked while mounted and e2fsck may have
1212 * set s_state to EXT2_VALID_FS after some corrections.
1214 static int ext2_sync_fs(struct super_block
*sb
, int wait
)
1216 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
1217 struct ext2_super_block
*es
= EXT2_SB(sb
)->s_es
;
1220 * Write quota structures to quota file, sync_blockdev() will write
1221 * them to disk later
1223 dquot_writeback_dquots(sb
, -1);
1225 spin_lock(&sbi
->s_lock
);
1226 if (es
->s_state
& cpu_to_le16(EXT2_VALID_FS
)) {
1227 ext2_debug("setting valid to 0\n");
1228 es
->s_state
&= cpu_to_le16(~EXT2_VALID_FS
);
1230 spin_unlock(&sbi
->s_lock
);
1231 ext2_sync_super(sb
, es
, wait
);
1235 static int ext2_freeze(struct super_block
*sb
)
1237 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
1240 * Open but unlinked files present? Keep EXT2_VALID_FS flag cleared
1241 * because we have unattached inodes and thus filesystem is not fully
1244 if (atomic_long_read(&sb
->s_remove_count
)) {
1245 ext2_sync_fs(sb
, 1);
1248 /* Set EXT2_FS_VALID flag */
1249 spin_lock(&sbi
->s_lock
);
1250 sbi
->s_es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
1251 spin_unlock(&sbi
->s_lock
);
1252 ext2_sync_super(sb
, sbi
->s_es
, 1);
1257 static int ext2_unfreeze(struct super_block
*sb
)
1259 /* Just write sb to clear EXT2_VALID_FS flag */
1260 ext2_write_super(sb
);
1265 void ext2_write_super(struct super_block
*sb
)
1267 if (!(sb
->s_flags
& MS_RDONLY
))
1268 ext2_sync_fs(sb
, 1);
1271 static int ext2_remount (struct super_block
* sb
, int * flags
, char * data
)
1273 struct ext2_sb_info
* sbi
= EXT2_SB(sb
);
1274 struct ext2_super_block
* es
;
1275 struct ext2_mount_options old_opts
;
1276 unsigned long old_sb_flags
;
1279 sync_filesystem(sb
);
1280 spin_lock(&sbi
->s_lock
);
1282 /* Store the old options */
1283 old_sb_flags
= sb
->s_flags
;
1284 old_opts
.s_mount_opt
= sbi
->s_mount_opt
;
1285 old_opts
.s_resuid
= sbi
->s_resuid
;
1286 old_opts
.s_resgid
= sbi
->s_resgid
;
1289 * Allow the "check" option to be passed as a remount option.
1291 if (!parse_options(data
, sb
)) {
1296 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
1297 ((sbi
->s_mount_opt
& EXT2_MOUNT_POSIX_ACL
) ? MS_POSIXACL
: 0);
1300 if ((sbi
->s_mount_opt
^ old_opts
.s_mount_opt
) & EXT2_MOUNT_DAX
) {
1301 ext2_msg(sb
, KERN_WARNING
, "warning: refusing change of "
1302 "dax flag with busy inodes while remounting");
1303 sbi
->s_mount_opt
^= EXT2_MOUNT_DAX
;
1305 if ((*flags
& MS_RDONLY
) == (sb
->s_flags
& MS_RDONLY
)) {
1306 spin_unlock(&sbi
->s_lock
);
1309 if (*flags
& MS_RDONLY
) {
1310 if (le16_to_cpu(es
->s_state
) & EXT2_VALID_FS
||
1311 !(sbi
->s_mount_state
& EXT2_VALID_FS
)) {
1312 spin_unlock(&sbi
->s_lock
);
1317 * OK, we are remounting a valid rw partition rdonly, so set
1318 * the rdonly flag and then mark the partition as valid again.
1320 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
1321 es
->s_mtime
= cpu_to_le32(get_seconds());
1322 spin_unlock(&sbi
->s_lock
);
1324 err
= dquot_suspend(sb
, -1);
1326 spin_lock(&sbi
->s_lock
);
1330 ext2_sync_super(sb
, es
, 1);
1332 __le32 ret
= EXT2_HAS_RO_COMPAT_FEATURE(sb
,
1333 ~EXT2_FEATURE_RO_COMPAT_SUPP
);
1335 ext2_msg(sb
, KERN_WARNING
,
1336 "warning: couldn't remount RDWR because of "
1337 "unsupported optional features (%x).",
1343 * Mounting a RDONLY partition read-write, so reread and
1344 * store the current valid flag. (It may have been changed
1345 * by e2fsck since we originally mounted the partition.)
1347 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
1348 if (!ext2_setup_super (sb
, es
, 0))
1349 sb
->s_flags
&= ~MS_RDONLY
;
1350 spin_unlock(&sbi
->s_lock
);
1352 ext2_write_super(sb
);
1354 dquot_resume(sb
, -1);
1359 sbi
->s_mount_opt
= old_opts
.s_mount_opt
;
1360 sbi
->s_resuid
= old_opts
.s_resuid
;
1361 sbi
->s_resgid
= old_opts
.s_resgid
;
1362 sb
->s_flags
= old_sb_flags
;
1363 spin_unlock(&sbi
->s_lock
);
1367 static int ext2_statfs (struct dentry
* dentry
, struct kstatfs
* buf
)
1369 struct super_block
*sb
= dentry
->d_sb
;
1370 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
1371 struct ext2_super_block
*es
= sbi
->s_es
;
1374 spin_lock(&sbi
->s_lock
);
1376 if (test_opt (sb
, MINIX_DF
))
1377 sbi
->s_overhead_last
= 0;
1378 else if (sbi
->s_blocks_last
!= le32_to_cpu(es
->s_blocks_count
)) {
1379 unsigned long i
, overhead
= 0;
1383 * Compute the overhead (FS structures). This is constant
1384 * for a given filesystem unless the number of block groups
1385 * changes so we cache the previous value until it does.
1389 * All of the blocks before first_data_block are
1392 overhead
= le32_to_cpu(es
->s_first_data_block
);
1395 * Add the overhead attributed to the superblock and
1396 * block group descriptors. If the sparse superblocks
1397 * feature is turned on, then not all groups have this.
1399 for (i
= 0; i
< sbi
->s_groups_count
; i
++)
1400 overhead
+= ext2_bg_has_super(sb
, i
) +
1401 ext2_bg_num_gdb(sb
, i
);
1404 * Every block group has an inode bitmap, a block
1405 * bitmap, and an inode table.
1407 overhead
+= (sbi
->s_groups_count
*
1408 (2 + sbi
->s_itb_per_group
));
1409 sbi
->s_overhead_last
= overhead
;
1411 sbi
->s_blocks_last
= le32_to_cpu(es
->s_blocks_count
);
1414 buf
->f_type
= EXT2_SUPER_MAGIC
;
1415 buf
->f_bsize
= sb
->s_blocksize
;
1416 buf
->f_blocks
= le32_to_cpu(es
->s_blocks_count
) - sbi
->s_overhead_last
;
1417 buf
->f_bfree
= ext2_count_free_blocks(sb
);
1418 es
->s_free_blocks_count
= cpu_to_le32(buf
->f_bfree
);
1419 buf
->f_bavail
= buf
->f_bfree
- le32_to_cpu(es
->s_r_blocks_count
);
1420 if (buf
->f_bfree
< le32_to_cpu(es
->s_r_blocks_count
))
1422 buf
->f_files
= le32_to_cpu(es
->s_inodes_count
);
1423 buf
->f_ffree
= ext2_count_free_inodes(sb
);
1424 es
->s_free_inodes_count
= cpu_to_le32(buf
->f_ffree
);
1425 buf
->f_namelen
= EXT2_NAME_LEN
;
1426 fsid
= le64_to_cpup((void *)es
->s_uuid
) ^
1427 le64_to_cpup((void *)es
->s_uuid
+ sizeof(u64
));
1428 buf
->f_fsid
.val
[0] = fsid
& 0xFFFFFFFFUL
;
1429 buf
->f_fsid
.val
[1] = (fsid
>> 32) & 0xFFFFFFFFUL
;
1430 spin_unlock(&sbi
->s_lock
);
1434 static struct dentry
*ext2_mount(struct file_system_type
*fs_type
,
1435 int flags
, const char *dev_name
, void *data
)
1437 return mount_bdev(fs_type
, flags
, dev_name
, data
, ext2_fill_super
);
1442 /* Read data from quotafile - avoid pagecache and such because we cannot afford
1443 * acquiring the locks... As quota files are never truncated and quota code
1444 * itself serializes the operations (and no one else should touch the files)
1445 * we don't have to be afraid of races */
1446 static ssize_t
ext2_quota_read(struct super_block
*sb
, int type
, char *data
,
1447 size_t len
, loff_t off
)
1449 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
1450 sector_t blk
= off
>> EXT2_BLOCK_SIZE_BITS(sb
);
1452 int offset
= off
& (sb
->s_blocksize
- 1);
1455 struct buffer_head tmp_bh
;
1456 struct buffer_head
*bh
;
1457 loff_t i_size
= i_size_read(inode
);
1461 if (off
+len
> i_size
)
1464 while (toread
> 0) {
1465 tocopy
= sb
->s_blocksize
- offset
< toread
?
1466 sb
->s_blocksize
- offset
: toread
;
1469 tmp_bh
.b_size
= sb
->s_blocksize
;
1470 err
= ext2_get_block(inode
, blk
, &tmp_bh
, 0);
1473 if (!buffer_mapped(&tmp_bh
)) /* A hole? */
1474 memset(data
, 0, tocopy
);
1476 bh
= sb_bread(sb
, tmp_bh
.b_blocknr
);
1479 memcpy(data
, bh
->b_data
+offset
, tocopy
);
1490 /* Write to quotafile */
1491 static ssize_t
ext2_quota_write(struct super_block
*sb
, int type
,
1492 const char *data
, size_t len
, loff_t off
)
1494 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
1495 sector_t blk
= off
>> EXT2_BLOCK_SIZE_BITS(sb
);
1497 int offset
= off
& (sb
->s_blocksize
- 1);
1499 size_t towrite
= len
;
1500 struct buffer_head tmp_bh
;
1501 struct buffer_head
*bh
;
1503 while (towrite
> 0) {
1504 tocopy
= sb
->s_blocksize
- offset
< towrite
?
1505 sb
->s_blocksize
- offset
: towrite
;
1508 tmp_bh
.b_size
= sb
->s_blocksize
;
1509 err
= ext2_get_block(inode
, blk
, &tmp_bh
, 1);
1512 if (offset
|| tocopy
!= EXT2_BLOCK_SIZE(sb
))
1513 bh
= sb_bread(sb
, tmp_bh
.b_blocknr
);
1515 bh
= sb_getblk(sb
, tmp_bh
.b_blocknr
);
1516 if (unlikely(!bh
)) {
1521 memcpy(bh
->b_data
+offset
, data
, tocopy
);
1522 flush_dcache_page(bh
->b_page
);
1523 set_buffer_uptodate(bh
);
1524 mark_buffer_dirty(bh
);
1535 if (inode
->i_size
< off
+len
-towrite
)
1536 i_size_write(inode
, off
+len
-towrite
);
1538 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
1539 mark_inode_dirty(inode
);
1540 return len
- towrite
;
1545 static struct file_system_type ext2_fs_type
= {
1546 .owner
= THIS_MODULE
,
1548 .mount
= ext2_mount
,
1549 .kill_sb
= kill_block_super
,
1550 .fs_flags
= FS_REQUIRES_DEV
,
1552 MODULE_ALIAS_FS("ext2");
1554 static int __init
init_ext2_fs(void)
1556 int err
= init_ext2_xattr();
1559 err
= init_inodecache();
1562 err
= register_filesystem(&ext2_fs_type
);
1567 destroy_inodecache();
1573 static void __exit
exit_ext2_fs(void)
1575 unregister_filesystem(&ext2_fs_type
);
1576 destroy_inodecache();
1580 MODULE_AUTHOR("Remy Card and others");
1581 MODULE_DESCRIPTION("Second Extended Filesystem");
1582 MODULE_LICENSE("GPL");
1583 module_init(init_ext2_fs
)
1584 module_exit(exit_ext2_fs
)