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
);
195 inode_init_once(&ei
->vfs_inode
);
198 static int __init
init_inodecache(void)
200 ext2_inode_cachep
= kmem_cache_create("ext2_inode_cache",
201 sizeof(struct ext2_inode_info
),
202 0, (SLAB_RECLAIM_ACCOUNT
|
205 if (ext2_inode_cachep
== NULL
)
210 static void destroy_inodecache(void)
213 * Make sure all delayed rcu free inodes are flushed before we
217 kmem_cache_destroy(ext2_inode_cachep
);
220 static int ext2_show_options(struct seq_file
*seq
, struct dentry
*root
)
222 struct super_block
*sb
= root
->d_sb
;
223 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
224 struct ext2_super_block
*es
= sbi
->s_es
;
225 unsigned long def_mount_opts
;
227 spin_lock(&sbi
->s_lock
);
228 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
230 if (sbi
->s_sb_block
!= 1)
231 seq_printf(seq
, ",sb=%lu", sbi
->s_sb_block
);
232 if (test_opt(sb
, MINIX_DF
))
233 seq_puts(seq
, ",minixdf");
234 if (test_opt(sb
, GRPID
))
235 seq_puts(seq
, ",grpid");
236 if (!test_opt(sb
, GRPID
) && (def_mount_opts
& EXT2_DEFM_BSDGROUPS
))
237 seq_puts(seq
, ",nogrpid");
238 if (!uid_eq(sbi
->s_resuid
, make_kuid(&init_user_ns
, EXT2_DEF_RESUID
)) ||
239 le16_to_cpu(es
->s_def_resuid
) != EXT2_DEF_RESUID
) {
240 seq_printf(seq
, ",resuid=%u",
241 from_kuid_munged(&init_user_ns
, sbi
->s_resuid
));
243 if (!gid_eq(sbi
->s_resgid
, make_kgid(&init_user_ns
, EXT2_DEF_RESGID
)) ||
244 le16_to_cpu(es
->s_def_resgid
) != EXT2_DEF_RESGID
) {
245 seq_printf(seq
, ",resgid=%u",
246 from_kgid_munged(&init_user_ns
, sbi
->s_resgid
));
248 if (test_opt(sb
, ERRORS_RO
)) {
249 int def_errors
= le16_to_cpu(es
->s_errors
);
251 if (def_errors
== EXT2_ERRORS_PANIC
||
252 def_errors
== EXT2_ERRORS_CONTINUE
) {
253 seq_puts(seq
, ",errors=remount-ro");
256 if (test_opt(sb
, ERRORS_CONT
))
257 seq_puts(seq
, ",errors=continue");
258 if (test_opt(sb
, ERRORS_PANIC
))
259 seq_puts(seq
, ",errors=panic");
260 if (test_opt(sb
, NO_UID32
))
261 seq_puts(seq
, ",nouid32");
262 if (test_opt(sb
, DEBUG
))
263 seq_puts(seq
, ",debug");
264 if (test_opt(sb
, OLDALLOC
))
265 seq_puts(seq
, ",oldalloc");
267 #ifdef CONFIG_EXT2_FS_XATTR
268 if (test_opt(sb
, XATTR_USER
))
269 seq_puts(seq
, ",user_xattr");
270 if (!test_opt(sb
, XATTR_USER
) &&
271 (def_mount_opts
& EXT2_DEFM_XATTR_USER
)) {
272 seq_puts(seq
, ",nouser_xattr");
276 #ifdef CONFIG_EXT2_FS_POSIX_ACL
277 if (test_opt(sb
, POSIX_ACL
))
278 seq_puts(seq
, ",acl");
279 if (!test_opt(sb
, POSIX_ACL
) && (def_mount_opts
& EXT2_DEFM_ACL
))
280 seq_puts(seq
, ",noacl");
283 if (test_opt(sb
, NOBH
))
284 seq_puts(seq
, ",nobh");
286 #if defined(CONFIG_QUOTA)
287 if (sbi
->s_mount_opt
& EXT2_MOUNT_USRQUOTA
)
288 seq_puts(seq
, ",usrquota");
290 if (sbi
->s_mount_opt
& EXT2_MOUNT_GRPQUOTA
)
291 seq_puts(seq
, ",grpquota");
294 #if defined(CONFIG_EXT2_FS_XIP)
295 if (sbi
->s_mount_opt
& EXT2_MOUNT_XIP
)
296 seq_puts(seq
, ",xip");
299 if (!test_opt(sb
, RESERVATION
))
300 seq_puts(seq
, ",noreservation");
302 spin_unlock(&sbi
->s_lock
);
307 static ssize_t
ext2_quota_read(struct super_block
*sb
, int type
, char *data
, size_t len
, loff_t off
);
308 static ssize_t
ext2_quota_write(struct super_block
*sb
, int type
, const char *data
, size_t len
, loff_t off
);
309 static struct dquot
**ext2_get_dquots(struct inode
*inode
)
311 return EXT2_I(inode
)->i_dquot
;
315 static const struct super_operations ext2_sops
= {
316 .alloc_inode
= ext2_alloc_inode
,
317 .destroy_inode
= ext2_destroy_inode
,
318 .write_inode
= ext2_write_inode
,
319 .evict_inode
= ext2_evict_inode
,
320 .put_super
= ext2_put_super
,
321 .sync_fs
= ext2_sync_fs
,
322 .freeze_fs
= ext2_freeze
,
323 .unfreeze_fs
= ext2_unfreeze
,
324 .statfs
= ext2_statfs
,
325 .remount_fs
= ext2_remount
,
326 .show_options
= ext2_show_options
,
328 .quota_read
= ext2_quota_read
,
329 .quota_write
= ext2_quota_write
,
330 .get_dquots
= ext2_get_dquots
,
334 static struct inode
*ext2_nfs_get_inode(struct super_block
*sb
,
335 u64 ino
, u32 generation
)
339 if (ino
< EXT2_FIRST_INO(sb
) && ino
!= EXT2_ROOT_INO
)
340 return ERR_PTR(-ESTALE
);
341 if (ino
> le32_to_cpu(EXT2_SB(sb
)->s_es
->s_inodes_count
))
342 return ERR_PTR(-ESTALE
);
345 * ext2_iget isn't quite right if the inode is currently unallocated!
346 * However ext2_iget currently does appropriate checks to handle stale
347 * inodes so everything is OK.
349 inode
= ext2_iget(sb
, ino
);
351 return ERR_CAST(inode
);
352 if (generation
&& inode
->i_generation
!= generation
) {
353 /* we didn't find the right inode.. */
355 return ERR_PTR(-ESTALE
);
360 static struct dentry
*ext2_fh_to_dentry(struct super_block
*sb
, struct fid
*fid
,
361 int fh_len
, int fh_type
)
363 return generic_fh_to_dentry(sb
, fid
, fh_len
, fh_type
,
367 static struct dentry
*ext2_fh_to_parent(struct super_block
*sb
, struct fid
*fid
,
368 int fh_len
, int fh_type
)
370 return generic_fh_to_parent(sb
, fid
, fh_len
, fh_type
,
374 static const struct export_operations ext2_export_ops
= {
375 .fh_to_dentry
= ext2_fh_to_dentry
,
376 .fh_to_parent
= ext2_fh_to_parent
,
377 .get_parent
= ext2_get_parent
,
380 static unsigned long get_sb_block(void **data
)
382 unsigned long sb_block
;
383 char *options
= (char *) *data
;
385 if (!options
|| strncmp(options
, "sb=", 3) != 0)
386 return 1; /* Default location */
388 sb_block
= simple_strtoul(options
, &options
, 0);
389 if (*options
&& *options
!= ',') {
390 printk("EXT2-fs: Invalid sb specification: %s\n",
396 *data
= (void *) options
;
401 Opt_bsd_df
, Opt_minix_df
, Opt_grpid
, Opt_nogrpid
,
402 Opt_resgid
, Opt_resuid
, Opt_sb
, Opt_err_cont
, Opt_err_panic
,
403 Opt_err_ro
, Opt_nouid32
, Opt_nocheck
, Opt_debug
,
404 Opt_oldalloc
, Opt_orlov
, Opt_nobh
, Opt_user_xattr
, Opt_nouser_xattr
,
405 Opt_acl
, Opt_noacl
, Opt_xip
, Opt_ignore
, Opt_err
, Opt_quota
,
406 Opt_usrquota
, Opt_grpquota
, Opt_reservation
, Opt_noreservation
409 static const match_table_t tokens
= {
410 {Opt_bsd_df
, "bsddf"},
411 {Opt_minix_df
, "minixdf"},
412 {Opt_grpid
, "grpid"},
413 {Opt_grpid
, "bsdgroups"},
414 {Opt_nogrpid
, "nogrpid"},
415 {Opt_nogrpid
, "sysvgroups"},
416 {Opt_resgid
, "resgid=%u"},
417 {Opt_resuid
, "resuid=%u"},
419 {Opt_err_cont
, "errors=continue"},
420 {Opt_err_panic
, "errors=panic"},
421 {Opt_err_ro
, "errors=remount-ro"},
422 {Opt_nouid32
, "nouid32"},
423 {Opt_nocheck
, "check=none"},
424 {Opt_nocheck
, "nocheck"},
425 {Opt_debug
, "debug"},
426 {Opt_oldalloc
, "oldalloc"},
427 {Opt_orlov
, "orlov"},
429 {Opt_user_xattr
, "user_xattr"},
430 {Opt_nouser_xattr
, "nouser_xattr"},
432 {Opt_noacl
, "noacl"},
434 {Opt_grpquota
, "grpquota"},
435 {Opt_ignore
, "noquota"},
436 {Opt_quota
, "quota"},
437 {Opt_usrquota
, "usrquota"},
438 {Opt_reservation
, "reservation"},
439 {Opt_noreservation
, "noreservation"},
443 static int parse_options(char *options
, struct super_block
*sb
)
446 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
447 substring_t args
[MAX_OPT_ARGS
];
455 while ((p
= strsep (&options
, ",")) != NULL
) {
460 token
= match_token(p
, tokens
, args
);
463 clear_opt (sbi
->s_mount_opt
, MINIX_DF
);
466 set_opt (sbi
->s_mount_opt
, MINIX_DF
);
469 set_opt (sbi
->s_mount_opt
, GRPID
);
472 clear_opt (sbi
->s_mount_opt
, GRPID
);
475 if (match_int(&args
[0], &option
))
477 uid
= make_kuid(current_user_ns(), option
);
478 if (!uid_valid(uid
)) {
479 ext2_msg(sb
, KERN_ERR
, "Invalid uid value %d", option
);
486 if (match_int(&args
[0], &option
))
488 gid
= make_kgid(current_user_ns(), option
);
489 if (!gid_valid(gid
)) {
490 ext2_msg(sb
, KERN_ERR
, "Invalid gid value %d", option
);
496 /* handled by get_sb_block() instead of here */
497 /* *sb_block = match_int(&args[0]); */
500 clear_opt (sbi
->s_mount_opt
, ERRORS_CONT
);
501 clear_opt (sbi
->s_mount_opt
, ERRORS_RO
);
502 set_opt (sbi
->s_mount_opt
, ERRORS_PANIC
);
505 clear_opt (sbi
->s_mount_opt
, ERRORS_CONT
);
506 clear_opt (sbi
->s_mount_opt
, ERRORS_PANIC
);
507 set_opt (sbi
->s_mount_opt
, ERRORS_RO
);
510 clear_opt (sbi
->s_mount_opt
, ERRORS_RO
);
511 clear_opt (sbi
->s_mount_opt
, ERRORS_PANIC
);
512 set_opt (sbi
->s_mount_opt
, ERRORS_CONT
);
515 set_opt (sbi
->s_mount_opt
, NO_UID32
);
518 clear_opt (sbi
->s_mount_opt
, CHECK
);
521 set_opt (sbi
->s_mount_opt
, DEBUG
);
524 set_opt (sbi
->s_mount_opt
, OLDALLOC
);
527 clear_opt (sbi
->s_mount_opt
, OLDALLOC
);
530 set_opt (sbi
->s_mount_opt
, NOBH
);
532 #ifdef CONFIG_EXT2_FS_XATTR
534 set_opt (sbi
->s_mount_opt
, XATTR_USER
);
536 case Opt_nouser_xattr
:
537 clear_opt (sbi
->s_mount_opt
, XATTR_USER
);
541 case Opt_nouser_xattr
:
542 ext2_msg(sb
, KERN_INFO
, "(no)user_xattr options"
546 #ifdef CONFIG_EXT2_FS_POSIX_ACL
548 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
551 clear_opt(sbi
->s_mount_opt
, POSIX_ACL
);
556 ext2_msg(sb
, KERN_INFO
,
557 "(no)acl options not supported");
561 #ifdef CONFIG_EXT2_FS_XIP
562 set_opt (sbi
->s_mount_opt
, XIP
);
564 ext2_msg(sb
, KERN_INFO
, "xip option not supported");
568 #if defined(CONFIG_QUOTA)
571 set_opt(sbi
->s_mount_opt
, USRQUOTA
);
575 set_opt(sbi
->s_mount_opt
, GRPQUOTA
);
581 ext2_msg(sb
, KERN_INFO
,
582 "quota operations not supported");
586 case Opt_reservation
:
587 set_opt(sbi
->s_mount_opt
, RESERVATION
);
588 ext2_msg(sb
, KERN_INFO
, "reservations ON");
590 case Opt_noreservation
:
591 clear_opt(sbi
->s_mount_opt
, RESERVATION
);
592 ext2_msg(sb
, KERN_INFO
, "reservations OFF");
603 static int ext2_setup_super (struct super_block
* sb
,
604 struct ext2_super_block
* es
,
608 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
610 if (le32_to_cpu(es
->s_rev_level
) > EXT2_MAX_SUPP_REV
) {
611 ext2_msg(sb
, KERN_ERR
,
612 "error: revision level too high, "
613 "forcing read-only mode");
618 if (!(sbi
->s_mount_state
& EXT2_VALID_FS
))
619 ext2_msg(sb
, KERN_WARNING
,
620 "warning: mounting unchecked fs, "
621 "running e2fsck is recommended");
622 else if ((sbi
->s_mount_state
& EXT2_ERROR_FS
))
623 ext2_msg(sb
, KERN_WARNING
,
624 "warning: mounting fs with errors, "
625 "running e2fsck is recommended");
626 else if ((__s16
) le16_to_cpu(es
->s_max_mnt_count
) >= 0 &&
627 le16_to_cpu(es
->s_mnt_count
) >=
628 (unsigned short) (__s16
) le16_to_cpu(es
->s_max_mnt_count
))
629 ext2_msg(sb
, KERN_WARNING
,
630 "warning: maximal mount count reached, "
631 "running e2fsck is recommended");
632 else if (le32_to_cpu(es
->s_checkinterval
) &&
633 (le32_to_cpu(es
->s_lastcheck
) +
634 le32_to_cpu(es
->s_checkinterval
) <= get_seconds()))
635 ext2_msg(sb
, KERN_WARNING
,
636 "warning: checktime reached, "
637 "running e2fsck is recommended");
638 if (!le16_to_cpu(es
->s_max_mnt_count
))
639 es
->s_max_mnt_count
= cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT
);
640 le16_add_cpu(&es
->s_mnt_count
, 1);
641 if (test_opt (sb
, DEBUG
))
642 ext2_msg(sb
, KERN_INFO
, "%s, %s, bs=%lu, fs=%lu, gc=%lu, "
643 "bpg=%lu, ipg=%lu, mo=%04lx]",
644 EXT2FS_VERSION
, EXT2FS_DATE
, sb
->s_blocksize
,
647 EXT2_BLOCKS_PER_GROUP(sb
),
648 EXT2_INODES_PER_GROUP(sb
),
653 static int ext2_check_descriptors(struct super_block
*sb
)
656 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
658 ext2_debug ("Checking group descriptors");
660 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
661 struct ext2_group_desc
*gdp
= ext2_get_group_desc(sb
, i
, NULL
);
662 ext2_fsblk_t first_block
= ext2_group_first_block_no(sb
, i
);
663 ext2_fsblk_t last_block
;
665 if (i
== sbi
->s_groups_count
- 1)
666 last_block
= le32_to_cpu(sbi
->s_es
->s_blocks_count
) - 1;
668 last_block
= first_block
+
669 (EXT2_BLOCKS_PER_GROUP(sb
) - 1);
671 if (le32_to_cpu(gdp
->bg_block_bitmap
) < first_block
||
672 le32_to_cpu(gdp
->bg_block_bitmap
) > last_block
)
674 ext2_error (sb
, "ext2_check_descriptors",
675 "Block bitmap for group %d"
676 " not in group (block %lu)!",
677 i
, (unsigned long) le32_to_cpu(gdp
->bg_block_bitmap
));
680 if (le32_to_cpu(gdp
->bg_inode_bitmap
) < first_block
||
681 le32_to_cpu(gdp
->bg_inode_bitmap
) > last_block
)
683 ext2_error (sb
, "ext2_check_descriptors",
684 "Inode bitmap for group %d"
685 " not in group (block %lu)!",
686 i
, (unsigned long) le32_to_cpu(gdp
->bg_inode_bitmap
));
689 if (le32_to_cpu(gdp
->bg_inode_table
) < first_block
||
690 le32_to_cpu(gdp
->bg_inode_table
) + sbi
->s_itb_per_group
- 1 >
693 ext2_error (sb
, "ext2_check_descriptors",
694 "Inode table for group %d"
695 " not in group (block %lu)!",
696 i
, (unsigned long) le32_to_cpu(gdp
->bg_inode_table
));
704 * Maximal file size. There is a direct, and {,double-,triple-}indirect
705 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
706 * We need to be 1 filesystem block less than the 2^32 sector limit.
708 static loff_t
ext2_max_size(int bits
)
710 loff_t res
= EXT2_NDIR_BLOCKS
;
714 /* This is calculated to be the largest file size for a
715 * dense, file such that the total number of
716 * sectors in the file, including data and all indirect blocks,
717 * does not exceed 2^32 -1
718 * __u32 i_blocks representing the total number of
719 * 512 bytes blocks of the file
721 upper_limit
= (1LL << 32) - 1;
723 /* total blocks in file system block size */
724 upper_limit
>>= (bits
- 9);
727 /* indirect blocks */
729 /* double indirect blocks */
730 meta_blocks
+= 1 + (1LL << (bits
-2));
731 /* tripple indirect blocks */
732 meta_blocks
+= 1 + (1LL << (bits
-2)) + (1LL << (2*(bits
-2)));
734 upper_limit
-= meta_blocks
;
735 upper_limit
<<= bits
;
737 res
+= 1LL << (bits
-2);
738 res
+= 1LL << (2*(bits
-2));
739 res
+= 1LL << (3*(bits
-2));
741 if (res
> upper_limit
)
744 if (res
> MAX_LFS_FILESIZE
)
745 res
= MAX_LFS_FILESIZE
;
750 static unsigned long descriptor_loc(struct super_block
*sb
,
751 unsigned long logic_sb_block
,
754 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
755 unsigned long bg
, first_meta_bg
;
758 first_meta_bg
= le32_to_cpu(sbi
->s_es
->s_first_meta_bg
);
760 if (!EXT2_HAS_INCOMPAT_FEATURE(sb
, EXT2_FEATURE_INCOMPAT_META_BG
) ||
762 return (logic_sb_block
+ nr
+ 1);
763 bg
= sbi
->s_desc_per_block
* nr
;
764 if (ext2_bg_has_super(sb
, bg
))
767 return ext2_group_first_block_no(sb
, bg
) + has_super
;
770 static int ext2_fill_super(struct super_block
*sb
, void *data
, int silent
)
772 struct buffer_head
* bh
;
773 struct ext2_sb_info
* sbi
;
774 struct ext2_super_block
* es
;
777 unsigned long sb_block
= get_sb_block(&data
);
778 unsigned long logic_sb_block
;
779 unsigned long offset
= 0;
780 unsigned long def_mount_opts
;
782 int blocksize
= BLOCK_SIZE
;
789 sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
793 sbi
->s_blockgroup_lock
=
794 kzalloc(sizeof(struct blockgroup_lock
), GFP_KERNEL
);
795 if (!sbi
->s_blockgroup_lock
) {
800 sbi
->s_sb_block
= sb_block
;
802 spin_lock_init(&sbi
->s_lock
);
805 * See what the current blocksize for the device is, and
806 * use that as the blocksize. Otherwise (or if the blocksize
807 * is smaller than the default) use the default.
808 * This is important for devices that have a hardware
809 * sectorsize that is larger than the default.
811 blocksize
= sb_min_blocksize(sb
, BLOCK_SIZE
);
813 ext2_msg(sb
, KERN_ERR
, "error: unable to set blocksize");
818 * If the superblock doesn't start on a hardware sector boundary,
819 * calculate the offset.
821 if (blocksize
!= BLOCK_SIZE
) {
822 logic_sb_block
= (sb_block
*BLOCK_SIZE
) / blocksize
;
823 offset
= (sb_block
*BLOCK_SIZE
) % blocksize
;
825 logic_sb_block
= sb_block
;
828 if (!(bh
= sb_bread(sb
, logic_sb_block
))) {
829 ext2_msg(sb
, KERN_ERR
, "error: unable to read superblock");
833 * Note: s_es must be initialized as soon as possible because
834 * some ext2 macro-instructions depend on its value
836 es
= (struct ext2_super_block
*) (((char *)bh
->b_data
) + offset
);
838 sb
->s_magic
= le16_to_cpu(es
->s_magic
);
840 if (sb
->s_magic
!= EXT2_SUPER_MAGIC
)
843 /* Set defaults before we parse the mount options */
844 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
845 if (def_mount_opts
& EXT2_DEFM_DEBUG
)
846 set_opt(sbi
->s_mount_opt
, DEBUG
);
847 if (def_mount_opts
& EXT2_DEFM_BSDGROUPS
)
848 set_opt(sbi
->s_mount_opt
, GRPID
);
849 if (def_mount_opts
& EXT2_DEFM_UID16
)
850 set_opt(sbi
->s_mount_opt
, NO_UID32
);
851 #ifdef CONFIG_EXT2_FS_XATTR
852 if (def_mount_opts
& EXT2_DEFM_XATTR_USER
)
853 set_opt(sbi
->s_mount_opt
, XATTR_USER
);
855 #ifdef CONFIG_EXT2_FS_POSIX_ACL
856 if (def_mount_opts
& EXT2_DEFM_ACL
)
857 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
860 if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT2_ERRORS_PANIC
)
861 set_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
862 else if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT2_ERRORS_CONTINUE
)
863 set_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
865 set_opt(sbi
->s_mount_opt
, ERRORS_RO
);
867 sbi
->s_resuid
= make_kuid(&init_user_ns
, le16_to_cpu(es
->s_def_resuid
));
868 sbi
->s_resgid
= make_kgid(&init_user_ns
, le16_to_cpu(es
->s_def_resgid
));
870 set_opt(sbi
->s_mount_opt
, RESERVATION
);
872 if (!parse_options((char *) data
, sb
))
875 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
876 ((EXT2_SB(sb
)->s_mount_opt
& EXT2_MOUNT_POSIX_ACL
) ?
879 if (le32_to_cpu(es
->s_rev_level
) == EXT2_GOOD_OLD_REV
&&
880 (EXT2_HAS_COMPAT_FEATURE(sb
, ~0U) ||
881 EXT2_HAS_RO_COMPAT_FEATURE(sb
, ~0U) ||
882 EXT2_HAS_INCOMPAT_FEATURE(sb
, ~0U)))
883 ext2_msg(sb
, KERN_WARNING
,
884 "warning: feature flags set on rev 0 fs, "
885 "running e2fsck is recommended");
887 * Check feature flags regardless of the revision level, since we
888 * previously didn't change the revision level when setting the flags,
889 * so there is a chance incompat flags are set on a rev 0 filesystem.
891 features
= EXT2_HAS_INCOMPAT_FEATURE(sb
, ~EXT2_FEATURE_INCOMPAT_SUPP
);
893 ext2_msg(sb
, KERN_ERR
, "error: couldn't mount because of "
894 "unsupported optional features (%x)",
895 le32_to_cpu(features
));
898 if (!(sb
->s_flags
& MS_RDONLY
) &&
899 (features
= EXT2_HAS_RO_COMPAT_FEATURE(sb
, ~EXT2_FEATURE_RO_COMPAT_SUPP
))){
900 ext2_msg(sb
, KERN_ERR
, "error: couldn't mount RDWR because of "
901 "unsupported optional features (%x)",
902 le32_to_cpu(features
));
906 blocksize
= BLOCK_SIZE
<< le32_to_cpu(sbi
->s_es
->s_log_block_size
);
908 if (sbi
->s_mount_opt
& EXT2_MOUNT_XIP
) {
909 if (blocksize
!= PAGE_SIZE
) {
910 ext2_msg(sb
, KERN_ERR
,
911 "error: unsupported blocksize for xip");
914 if (!sb
->s_bdev
->bd_disk
->fops
->direct_access
) {
915 ext2_msg(sb
, KERN_ERR
,
916 "error: device does not support xip");
921 /* If the blocksize doesn't match, re-read the thing.. */
922 if (sb
->s_blocksize
!= blocksize
) {
925 if (!sb_set_blocksize(sb
, blocksize
)) {
926 ext2_msg(sb
, KERN_ERR
,
927 "error: bad blocksize %d", blocksize
);
931 logic_sb_block
= (sb_block
*BLOCK_SIZE
) / blocksize
;
932 offset
= (sb_block
*BLOCK_SIZE
) % blocksize
;
933 bh
= sb_bread(sb
, logic_sb_block
);
935 ext2_msg(sb
, KERN_ERR
, "error: couldn't read"
936 "superblock on 2nd try");
939 es
= (struct ext2_super_block
*) (((char *)bh
->b_data
) + offset
);
941 if (es
->s_magic
!= cpu_to_le16(EXT2_SUPER_MAGIC
)) {
942 ext2_msg(sb
, KERN_ERR
, "error: magic mismatch");
947 sb
->s_maxbytes
= ext2_max_size(sb
->s_blocksize_bits
);
948 sb
->s_max_links
= EXT2_LINK_MAX
;
950 if (le32_to_cpu(es
->s_rev_level
) == EXT2_GOOD_OLD_REV
) {
951 sbi
->s_inode_size
= EXT2_GOOD_OLD_INODE_SIZE
;
952 sbi
->s_first_ino
= EXT2_GOOD_OLD_FIRST_INO
;
954 sbi
->s_inode_size
= le16_to_cpu(es
->s_inode_size
);
955 sbi
->s_first_ino
= le32_to_cpu(es
->s_first_ino
);
956 if ((sbi
->s_inode_size
< EXT2_GOOD_OLD_INODE_SIZE
) ||
957 !is_power_of_2(sbi
->s_inode_size
) ||
958 (sbi
->s_inode_size
> blocksize
)) {
959 ext2_msg(sb
, KERN_ERR
,
960 "error: unsupported inode size: %d",
966 sbi
->s_frag_size
= EXT2_MIN_FRAG_SIZE
<<
967 le32_to_cpu(es
->s_log_frag_size
);
968 if (sbi
->s_frag_size
== 0)
970 sbi
->s_frags_per_block
= sb
->s_blocksize
/ sbi
->s_frag_size
;
972 sbi
->s_blocks_per_group
= le32_to_cpu(es
->s_blocks_per_group
);
973 sbi
->s_frags_per_group
= le32_to_cpu(es
->s_frags_per_group
);
974 sbi
->s_inodes_per_group
= le32_to_cpu(es
->s_inodes_per_group
);
976 if (EXT2_INODE_SIZE(sb
) == 0)
978 sbi
->s_inodes_per_block
= sb
->s_blocksize
/ EXT2_INODE_SIZE(sb
);
979 if (sbi
->s_inodes_per_block
== 0 || sbi
->s_inodes_per_group
== 0)
981 sbi
->s_itb_per_group
= sbi
->s_inodes_per_group
/
982 sbi
->s_inodes_per_block
;
983 sbi
->s_desc_per_block
= sb
->s_blocksize
/
984 sizeof (struct ext2_group_desc
);
986 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
987 sbi
->s_addr_per_block_bits
=
988 ilog2 (EXT2_ADDR_PER_BLOCK(sb
));
989 sbi
->s_desc_per_block_bits
=
990 ilog2 (EXT2_DESC_PER_BLOCK(sb
));
992 if (sb
->s_magic
!= EXT2_SUPER_MAGIC
)
995 if (sb
->s_blocksize
!= bh
->b_size
) {
997 ext2_msg(sb
, KERN_ERR
, "error: unsupported blocksize");
1001 if (sb
->s_blocksize
!= sbi
->s_frag_size
) {
1002 ext2_msg(sb
, KERN_ERR
,
1003 "error: fragsize %lu != blocksize %lu"
1004 "(not supported yet)",
1005 sbi
->s_frag_size
, sb
->s_blocksize
);
1009 if (sbi
->s_blocks_per_group
> sb
->s_blocksize
* 8) {
1010 ext2_msg(sb
, KERN_ERR
,
1011 "error: #blocks per group too big: %lu",
1012 sbi
->s_blocks_per_group
);
1015 if (sbi
->s_frags_per_group
> sb
->s_blocksize
* 8) {
1016 ext2_msg(sb
, KERN_ERR
,
1017 "error: #fragments per group too big: %lu",
1018 sbi
->s_frags_per_group
);
1021 if (sbi
->s_inodes_per_group
> sb
->s_blocksize
* 8) {
1022 ext2_msg(sb
, KERN_ERR
,
1023 "error: #inodes per group too big: %lu",
1024 sbi
->s_inodes_per_group
);
1028 if (EXT2_BLOCKS_PER_GROUP(sb
) == 0)
1030 sbi
->s_groups_count
= ((le32_to_cpu(es
->s_blocks_count
) -
1031 le32_to_cpu(es
->s_first_data_block
) - 1)
1032 / EXT2_BLOCKS_PER_GROUP(sb
)) + 1;
1033 db_count
= (sbi
->s_groups_count
+ EXT2_DESC_PER_BLOCK(sb
) - 1) /
1034 EXT2_DESC_PER_BLOCK(sb
);
1035 sbi
->s_group_desc
= kmalloc (db_count
* sizeof (struct buffer_head
*), GFP_KERNEL
);
1036 if (sbi
->s_group_desc
== NULL
) {
1037 ext2_msg(sb
, KERN_ERR
, "error: not enough memory");
1040 bgl_lock_init(sbi
->s_blockgroup_lock
);
1041 sbi
->s_debts
= kcalloc(sbi
->s_groups_count
, sizeof(*sbi
->s_debts
), GFP_KERNEL
);
1042 if (!sbi
->s_debts
) {
1043 ext2_msg(sb
, KERN_ERR
, "error: not enough memory");
1044 goto failed_mount_group_desc
;
1046 for (i
= 0; i
< db_count
; i
++) {
1047 block
= descriptor_loc(sb
, logic_sb_block
, i
);
1048 sbi
->s_group_desc
[i
] = sb_bread(sb
, block
);
1049 if (!sbi
->s_group_desc
[i
]) {
1050 for (j
= 0; j
< i
; j
++)
1051 brelse (sbi
->s_group_desc
[j
]);
1052 ext2_msg(sb
, KERN_ERR
,
1053 "error: unable to read group descriptors");
1054 goto failed_mount_group_desc
;
1057 if (!ext2_check_descriptors (sb
)) {
1058 ext2_msg(sb
, KERN_ERR
, "group descriptors corrupted");
1061 sbi
->s_gdb_count
= db_count
;
1062 get_random_bytes(&sbi
->s_next_generation
, sizeof(u32
));
1063 spin_lock_init(&sbi
->s_next_gen_lock
);
1065 /* per fileystem reservation list head & lock */
1066 spin_lock_init(&sbi
->s_rsv_window_lock
);
1067 sbi
->s_rsv_window_root
= RB_ROOT
;
1069 * Add a single, static dummy reservation to the start of the
1070 * reservation window list --- it gives us a placeholder for
1071 * append-at-start-of-list which makes the allocation logic
1074 sbi
->s_rsv_window_head
.rsv_start
= EXT2_RESERVE_WINDOW_NOT_ALLOCATED
;
1075 sbi
->s_rsv_window_head
.rsv_end
= EXT2_RESERVE_WINDOW_NOT_ALLOCATED
;
1076 sbi
->s_rsv_window_head
.rsv_alloc_hit
= 0;
1077 sbi
->s_rsv_window_head
.rsv_goal_size
= 0;
1078 ext2_rsv_window_add(sb
, &sbi
->s_rsv_window_head
);
1080 err
= percpu_counter_init(&sbi
->s_freeblocks_counter
,
1081 ext2_count_free_blocks(sb
), GFP_KERNEL
);
1083 err
= percpu_counter_init(&sbi
->s_freeinodes_counter
,
1084 ext2_count_free_inodes(sb
), GFP_KERNEL
);
1087 err
= percpu_counter_init(&sbi
->s_dirs_counter
,
1088 ext2_count_dirs(sb
), GFP_KERNEL
);
1091 ext2_msg(sb
, KERN_ERR
, "error: insufficient memory");
1095 * set up enough so that it can read an inode
1097 sb
->s_op
= &ext2_sops
;
1098 sb
->s_export_op
= &ext2_export_ops
;
1099 sb
->s_xattr
= ext2_xattr_handlers
;
1102 sb
->dq_op
= &dquot_operations
;
1103 sb
->s_qcop
= &dquot_quotactl_ops
;
1104 sb
->s_quota_types
= QTYPE_MASK_USR
| QTYPE_MASK_GRP
;
1107 root
= ext2_iget(sb
, EXT2_ROOT_INO
);
1109 ret
= PTR_ERR(root
);
1112 if (!S_ISDIR(root
->i_mode
) || !root
->i_blocks
|| !root
->i_size
) {
1114 ext2_msg(sb
, KERN_ERR
, "error: corrupt root inode, run e2fsck");
1118 sb
->s_root
= d_make_root(root
);
1120 ext2_msg(sb
, KERN_ERR
, "error: get root inode failed");
1124 if (EXT2_HAS_COMPAT_FEATURE(sb
, EXT3_FEATURE_COMPAT_HAS_JOURNAL
))
1125 ext2_msg(sb
, KERN_WARNING
,
1126 "warning: mounting ext3 filesystem as ext2");
1127 if (ext2_setup_super (sb
, es
, sb
->s_flags
& MS_RDONLY
))
1128 sb
->s_flags
|= MS_RDONLY
;
1129 ext2_write_super(sb
);
1134 ext2_msg(sb
, KERN_ERR
,
1135 "error: can't find an ext2 filesystem on dev %s.",
1139 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
1140 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
1141 percpu_counter_destroy(&sbi
->s_dirs_counter
);
1143 for (i
= 0; i
< db_count
; i
++)
1144 brelse(sbi
->s_group_desc
[i
]);
1145 failed_mount_group_desc
:
1146 kfree(sbi
->s_group_desc
);
1147 kfree(sbi
->s_debts
);
1151 sb
->s_fs_info
= NULL
;
1152 kfree(sbi
->s_blockgroup_lock
);
1158 static void ext2_clear_super_error(struct super_block
*sb
)
1160 struct buffer_head
*sbh
= EXT2_SB(sb
)->s_sbh
;
1162 if (buffer_write_io_error(sbh
)) {
1164 * Oh, dear. A previous attempt to write the
1165 * superblock failed. This could happen because the
1166 * USB device was yanked out. Or it could happen to
1167 * be a transient write error and maybe the block will
1168 * be remapped. Nothing we can do but to retry the
1169 * write and hope for the best.
1171 ext2_msg(sb
, KERN_ERR
,
1172 "previous I/O error to superblock detected\n");
1173 clear_buffer_write_io_error(sbh
);
1174 set_buffer_uptodate(sbh
);
1178 static void ext2_sync_super(struct super_block
*sb
, struct ext2_super_block
*es
,
1181 ext2_clear_super_error(sb
);
1182 spin_lock(&EXT2_SB(sb
)->s_lock
);
1183 es
->s_free_blocks_count
= cpu_to_le32(ext2_count_free_blocks(sb
));
1184 es
->s_free_inodes_count
= cpu_to_le32(ext2_count_free_inodes(sb
));
1185 es
->s_wtime
= cpu_to_le32(get_seconds());
1186 /* unlock before we do IO */
1187 spin_unlock(&EXT2_SB(sb
)->s_lock
);
1188 mark_buffer_dirty(EXT2_SB(sb
)->s_sbh
);
1190 sync_dirty_buffer(EXT2_SB(sb
)->s_sbh
);
1194 * In the second extended file system, it is not necessary to
1195 * write the super block since we use a mapping of the
1196 * disk super block in a buffer.
1198 * However, this function is still used to set the fs valid
1199 * flags to 0. We need to set this flag to 0 since the fs
1200 * may have been checked while mounted and e2fsck may have
1201 * set s_state to EXT2_VALID_FS after some corrections.
1203 static int ext2_sync_fs(struct super_block
*sb
, int wait
)
1205 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
1206 struct ext2_super_block
*es
= EXT2_SB(sb
)->s_es
;
1209 * Write quota structures to quota file, sync_blockdev() will write
1210 * them to disk later
1212 dquot_writeback_dquots(sb
, -1);
1214 spin_lock(&sbi
->s_lock
);
1215 if (es
->s_state
& cpu_to_le16(EXT2_VALID_FS
)) {
1216 ext2_debug("setting valid to 0\n");
1217 es
->s_state
&= cpu_to_le16(~EXT2_VALID_FS
);
1219 spin_unlock(&sbi
->s_lock
);
1220 ext2_sync_super(sb
, es
, wait
);
1224 static int ext2_freeze(struct super_block
*sb
)
1226 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
1229 * Open but unlinked files present? Keep EXT2_VALID_FS flag cleared
1230 * because we have unattached inodes and thus filesystem is not fully
1233 if (atomic_long_read(&sb
->s_remove_count
)) {
1234 ext2_sync_fs(sb
, 1);
1237 /* Set EXT2_FS_VALID flag */
1238 spin_lock(&sbi
->s_lock
);
1239 sbi
->s_es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
1240 spin_unlock(&sbi
->s_lock
);
1241 ext2_sync_super(sb
, sbi
->s_es
, 1);
1246 static int ext2_unfreeze(struct super_block
*sb
)
1248 /* Just write sb to clear EXT2_VALID_FS flag */
1249 ext2_write_super(sb
);
1254 void ext2_write_super(struct super_block
*sb
)
1256 if (!(sb
->s_flags
& MS_RDONLY
))
1257 ext2_sync_fs(sb
, 1);
1260 static int ext2_remount (struct super_block
* sb
, int * flags
, char * data
)
1262 struct ext2_sb_info
* sbi
= EXT2_SB(sb
);
1263 struct ext2_super_block
* es
;
1264 struct ext2_mount_options old_opts
;
1265 unsigned long old_sb_flags
;
1268 sync_filesystem(sb
);
1269 spin_lock(&sbi
->s_lock
);
1271 /* Store the old options */
1272 old_sb_flags
= sb
->s_flags
;
1273 old_opts
.s_mount_opt
= sbi
->s_mount_opt
;
1274 old_opts
.s_resuid
= sbi
->s_resuid
;
1275 old_opts
.s_resgid
= sbi
->s_resgid
;
1278 * Allow the "check" option to be passed as a remount option.
1280 if (!parse_options(data
, sb
)) {
1285 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
1286 ((sbi
->s_mount_opt
& EXT2_MOUNT_POSIX_ACL
) ? MS_POSIXACL
: 0);
1289 if ((sbi
->s_mount_opt
^ old_opts
.s_mount_opt
) & EXT2_MOUNT_XIP
) {
1290 ext2_msg(sb
, KERN_WARNING
, "warning: refusing change of "
1291 "xip flag with busy inodes while remounting");
1292 sbi
->s_mount_opt
^= EXT2_MOUNT_XIP
;
1294 if ((*flags
& MS_RDONLY
) == (sb
->s_flags
& MS_RDONLY
)) {
1295 spin_unlock(&sbi
->s_lock
);
1298 if (*flags
& MS_RDONLY
) {
1299 if (le16_to_cpu(es
->s_state
) & EXT2_VALID_FS
||
1300 !(sbi
->s_mount_state
& EXT2_VALID_FS
)) {
1301 spin_unlock(&sbi
->s_lock
);
1306 * OK, we are remounting a valid rw partition rdonly, so set
1307 * the rdonly flag and then mark the partition as valid again.
1309 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
1310 es
->s_mtime
= cpu_to_le32(get_seconds());
1311 spin_unlock(&sbi
->s_lock
);
1313 err
= dquot_suspend(sb
, -1);
1315 spin_lock(&sbi
->s_lock
);
1319 ext2_sync_super(sb
, es
, 1);
1321 __le32 ret
= EXT2_HAS_RO_COMPAT_FEATURE(sb
,
1322 ~EXT2_FEATURE_RO_COMPAT_SUPP
);
1324 ext2_msg(sb
, KERN_WARNING
,
1325 "warning: couldn't remount RDWR because of "
1326 "unsupported optional features (%x).",
1332 * Mounting a RDONLY partition read-write, so reread and
1333 * store the current valid flag. (It may have been changed
1334 * by e2fsck since we originally mounted the partition.)
1336 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
1337 if (!ext2_setup_super (sb
, es
, 0))
1338 sb
->s_flags
&= ~MS_RDONLY
;
1339 spin_unlock(&sbi
->s_lock
);
1341 ext2_write_super(sb
);
1343 dquot_resume(sb
, -1);
1348 sbi
->s_mount_opt
= old_opts
.s_mount_opt
;
1349 sbi
->s_resuid
= old_opts
.s_resuid
;
1350 sbi
->s_resgid
= old_opts
.s_resgid
;
1351 sb
->s_flags
= old_sb_flags
;
1352 spin_unlock(&sbi
->s_lock
);
1356 static int ext2_statfs (struct dentry
* dentry
, struct kstatfs
* buf
)
1358 struct super_block
*sb
= dentry
->d_sb
;
1359 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
1360 struct ext2_super_block
*es
= sbi
->s_es
;
1363 spin_lock(&sbi
->s_lock
);
1365 if (test_opt (sb
, MINIX_DF
))
1366 sbi
->s_overhead_last
= 0;
1367 else if (sbi
->s_blocks_last
!= le32_to_cpu(es
->s_blocks_count
)) {
1368 unsigned long i
, overhead
= 0;
1372 * Compute the overhead (FS structures). This is constant
1373 * for a given filesystem unless the number of block groups
1374 * changes so we cache the previous value until it does.
1378 * All of the blocks before first_data_block are
1381 overhead
= le32_to_cpu(es
->s_first_data_block
);
1384 * Add the overhead attributed to the superblock and
1385 * block group descriptors. If the sparse superblocks
1386 * feature is turned on, then not all groups have this.
1388 for (i
= 0; i
< sbi
->s_groups_count
; i
++)
1389 overhead
+= ext2_bg_has_super(sb
, i
) +
1390 ext2_bg_num_gdb(sb
, i
);
1393 * Every block group has an inode bitmap, a block
1394 * bitmap, and an inode table.
1396 overhead
+= (sbi
->s_groups_count
*
1397 (2 + sbi
->s_itb_per_group
));
1398 sbi
->s_overhead_last
= overhead
;
1400 sbi
->s_blocks_last
= le32_to_cpu(es
->s_blocks_count
);
1403 buf
->f_type
= EXT2_SUPER_MAGIC
;
1404 buf
->f_bsize
= sb
->s_blocksize
;
1405 buf
->f_blocks
= le32_to_cpu(es
->s_blocks_count
) - sbi
->s_overhead_last
;
1406 buf
->f_bfree
= ext2_count_free_blocks(sb
);
1407 es
->s_free_blocks_count
= cpu_to_le32(buf
->f_bfree
);
1408 buf
->f_bavail
= buf
->f_bfree
- le32_to_cpu(es
->s_r_blocks_count
);
1409 if (buf
->f_bfree
< le32_to_cpu(es
->s_r_blocks_count
))
1411 buf
->f_files
= le32_to_cpu(es
->s_inodes_count
);
1412 buf
->f_ffree
= ext2_count_free_inodes(sb
);
1413 es
->s_free_inodes_count
= cpu_to_le32(buf
->f_ffree
);
1414 buf
->f_namelen
= EXT2_NAME_LEN
;
1415 fsid
= le64_to_cpup((void *)es
->s_uuid
) ^
1416 le64_to_cpup((void *)es
->s_uuid
+ sizeof(u64
));
1417 buf
->f_fsid
.val
[0] = fsid
& 0xFFFFFFFFUL
;
1418 buf
->f_fsid
.val
[1] = (fsid
>> 32) & 0xFFFFFFFFUL
;
1419 spin_unlock(&sbi
->s_lock
);
1423 static struct dentry
*ext2_mount(struct file_system_type
*fs_type
,
1424 int flags
, const char *dev_name
, void *data
)
1426 return mount_bdev(fs_type
, flags
, dev_name
, data
, ext2_fill_super
);
1431 /* Read data from quotafile - avoid pagecache and such because we cannot afford
1432 * acquiring the locks... As quota files are never truncated and quota code
1433 * itself serializes the operations (and no one else should touch the files)
1434 * we don't have to be afraid of races */
1435 static ssize_t
ext2_quota_read(struct super_block
*sb
, int type
, char *data
,
1436 size_t len
, loff_t off
)
1438 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
1439 sector_t blk
= off
>> EXT2_BLOCK_SIZE_BITS(sb
);
1441 int offset
= off
& (sb
->s_blocksize
- 1);
1444 struct buffer_head tmp_bh
;
1445 struct buffer_head
*bh
;
1446 loff_t i_size
= i_size_read(inode
);
1450 if (off
+len
> i_size
)
1453 while (toread
> 0) {
1454 tocopy
= sb
->s_blocksize
- offset
< toread
?
1455 sb
->s_blocksize
- offset
: toread
;
1458 tmp_bh
.b_size
= sb
->s_blocksize
;
1459 err
= ext2_get_block(inode
, blk
, &tmp_bh
, 0);
1462 if (!buffer_mapped(&tmp_bh
)) /* A hole? */
1463 memset(data
, 0, tocopy
);
1465 bh
= sb_bread(sb
, tmp_bh
.b_blocknr
);
1468 memcpy(data
, bh
->b_data
+offset
, tocopy
);
1479 /* Write to quotafile */
1480 static ssize_t
ext2_quota_write(struct super_block
*sb
, int type
,
1481 const char *data
, size_t len
, loff_t off
)
1483 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
1484 sector_t blk
= off
>> EXT2_BLOCK_SIZE_BITS(sb
);
1486 int offset
= off
& (sb
->s_blocksize
- 1);
1488 size_t towrite
= len
;
1489 struct buffer_head tmp_bh
;
1490 struct buffer_head
*bh
;
1492 while (towrite
> 0) {
1493 tocopy
= sb
->s_blocksize
- offset
< towrite
?
1494 sb
->s_blocksize
- offset
: towrite
;
1497 tmp_bh
.b_size
= sb
->s_blocksize
;
1498 err
= ext2_get_block(inode
, blk
, &tmp_bh
, 1);
1501 if (offset
|| tocopy
!= EXT2_BLOCK_SIZE(sb
))
1502 bh
= sb_bread(sb
, tmp_bh
.b_blocknr
);
1504 bh
= sb_getblk(sb
, tmp_bh
.b_blocknr
);
1505 if (unlikely(!bh
)) {
1510 memcpy(bh
->b_data
+offset
, data
, tocopy
);
1511 flush_dcache_page(bh
->b_page
);
1512 set_buffer_uptodate(bh
);
1513 mark_buffer_dirty(bh
);
1524 if (inode
->i_size
< off
+len
-towrite
)
1525 i_size_write(inode
, off
+len
-towrite
);
1527 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
1528 mark_inode_dirty(inode
);
1529 return len
- towrite
;
1534 static struct file_system_type ext2_fs_type
= {
1535 .owner
= THIS_MODULE
,
1537 .mount
= ext2_mount
,
1538 .kill_sb
= kill_block_super
,
1539 .fs_flags
= FS_REQUIRES_DEV
,
1541 MODULE_ALIAS_FS("ext2");
1543 static int __init
init_ext2_fs(void)
1545 int err
= init_ext2_xattr();
1548 err
= init_inodecache();
1551 err
= register_filesystem(&ext2_fs_type
);
1556 destroy_inodecache();
1562 static void __exit
exit_ext2_fs(void)
1564 unregister_filesystem(&ext2_fs_type
);
1565 destroy_inodecache();
1569 MODULE_AUTHOR("Remy Card and others");
1570 MODULE_DESCRIPTION("Second Extended Filesystem");
1571 MODULE_LICENSE("GPL");
1572 module_init(init_ext2_fs
)
1573 module_exit(exit_ext2_fs
)