1 // SPDX-License-Identifier: GPL-2.0-only
3 * linux/fs/ext2/super.c
5 * Copyright (C) 1992, 1993, 1994, 1995
6 * Remy Card (card@masi.ibp.fr)
7 * Laboratoire MASI - Institut Blaise Pascal
8 * Universite Pierre et Marie Curie (Paris VI)
12 * linux/fs/minix/inode.c
14 * Copyright (C) 1991, 1992 Linus Torvalds
16 * Big-endian to little-endian byte-swapping/bitmaps by
17 * David S. Miller (davem@caip.rutgers.edu), 1995
20 #include <linux/module.h>
21 #include <linux/string.h>
23 #include <linux/slab.h>
24 #include <linux/init.h>
25 #include <linux/blkdev.h>
26 #include <linux/parser.h>
27 #include <linux/random.h>
28 #include <linux/buffer_head.h>
29 #include <linux/exportfs.h>
30 #include <linux/vfs.h>
31 #include <linux/seq_file.h>
32 #include <linux/mount.h>
33 #include <linux/log2.h>
34 #include <linux/quotaops.h>
35 #include <linux/uaccess.h>
36 #include <linux/dax.h>
37 #include <linux/iversion.h>
42 static void ext2_write_super(struct super_block
*sb
);
43 static int ext2_remount (struct super_block
* sb
, int * flags
, char * data
);
44 static int ext2_statfs (struct dentry
* dentry
, struct kstatfs
* buf
);
45 static int ext2_sync_fs(struct super_block
*sb
, int wait
);
46 static int ext2_freeze(struct super_block
*sb
);
47 static int ext2_unfreeze(struct super_block
*sb
);
49 void ext2_error(struct super_block
*sb
, const char *function
,
54 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
55 struct ext2_super_block
*es
= sbi
->s_es
;
58 spin_lock(&sbi
->s_lock
);
59 sbi
->s_mount_state
|= EXT2_ERROR_FS
;
60 es
->s_state
|= cpu_to_le16(EXT2_ERROR_FS
);
61 spin_unlock(&sbi
->s_lock
);
62 ext2_sync_super(sb
, es
, 1);
70 printk(KERN_CRIT
"EXT2-fs (%s): error: %s: %pV\n",
71 sb
->s_id
, function
, &vaf
);
75 if (test_opt(sb
, ERRORS_PANIC
))
76 panic("EXT2-fs: panic from previous error\n");
77 if (!sb_rdonly(sb
) && test_opt(sb
, ERRORS_RO
)) {
78 ext2_msg(sb
, KERN_CRIT
,
79 "error: remounting filesystem read-only");
80 sb
->s_flags
|= SB_RDONLY
;
84 void ext2_msg(struct super_block
*sb
, const char *prefix
,
95 printk("%sEXT2-fs (%s): %pV\n", prefix
, sb
->s_id
, &vaf
);
101 * This must be called with sbi->s_lock held.
103 void ext2_update_dynamic_rev(struct super_block
*sb
)
105 struct ext2_super_block
*es
= EXT2_SB(sb
)->s_es
;
107 if (le32_to_cpu(es
->s_rev_level
) > EXT2_GOOD_OLD_REV
)
110 ext2_msg(sb
, KERN_WARNING
,
111 "warning: updating to rev %d because of "
112 "new feature flag, running e2fsck is recommended",
115 es
->s_first_ino
= cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO
);
116 es
->s_inode_size
= cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE
);
117 es
->s_rev_level
= cpu_to_le32(EXT2_DYNAMIC_REV
);
118 /* leave es->s_feature_*compat flags alone */
119 /* es->s_uuid will be set by e2fsck if empty */
122 * The rest of the superblock fields should be zero, and if not it
123 * means they are likely already in use, so leave them alone. We
124 * can leave it up to e2fsck to clean up any inconsistencies there.
129 static int ext2_quota_off(struct super_block
*sb
, int type
);
131 static void ext2_quota_off_umount(struct super_block
*sb
)
135 for (type
= 0; type
< MAXQUOTAS
; type
++)
136 ext2_quota_off(sb
, type
);
139 static inline void ext2_quota_off_umount(struct super_block
*sb
)
144 static void ext2_put_super (struct super_block
* sb
)
148 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
150 ext2_quota_off_umount(sb
);
152 ext2_xattr_destroy_cache(sbi
->s_ea_block_cache
);
153 sbi
->s_ea_block_cache
= NULL
;
155 if (!sb_rdonly(sb
)) {
156 struct ext2_super_block
*es
= sbi
->s_es
;
158 spin_lock(&sbi
->s_lock
);
159 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
160 spin_unlock(&sbi
->s_lock
);
161 ext2_sync_super(sb
, es
, 1);
163 db_count
= sbi
->s_gdb_count
;
164 for (i
= 0; i
< db_count
; i
++)
165 brelse(sbi
->s_group_desc
[i
]);
166 kfree(sbi
->s_group_desc
);
168 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
169 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
170 percpu_counter_destroy(&sbi
->s_dirs_counter
);
172 sb
->s_fs_info
= NULL
;
173 kfree(sbi
->s_blockgroup_lock
);
174 fs_put_dax(sbi
->s_daxdev
);
178 static struct kmem_cache
* ext2_inode_cachep
;
180 static struct inode
*ext2_alloc_inode(struct super_block
*sb
)
182 struct ext2_inode_info
*ei
;
183 ei
= kmem_cache_alloc(ext2_inode_cachep
, GFP_KERNEL
);
186 ei
->i_block_alloc_info
= NULL
;
187 inode_set_iversion(&ei
->vfs_inode
, 1);
189 memset(&ei
->i_dquot
, 0, sizeof(ei
->i_dquot
));
192 return &ei
->vfs_inode
;
195 static void ext2_free_in_core_inode(struct inode
*inode
)
197 kmem_cache_free(ext2_inode_cachep
, EXT2_I(inode
));
200 static void init_once(void *foo
)
202 struct ext2_inode_info
*ei
= (struct ext2_inode_info
*) foo
;
204 rwlock_init(&ei
->i_meta_lock
);
205 #ifdef CONFIG_EXT2_FS_XATTR
206 init_rwsem(&ei
->xattr_sem
);
208 mutex_init(&ei
->truncate_mutex
);
209 inode_init_once(&ei
->vfs_inode
);
212 static int __init
init_inodecache(void)
214 ext2_inode_cachep
= kmem_cache_create_usercopy("ext2_inode_cache",
215 sizeof(struct ext2_inode_info
), 0,
216 (SLAB_RECLAIM_ACCOUNT
|SLAB_MEM_SPREAD
|
218 offsetof(struct ext2_inode_info
, i_data
),
219 sizeof_field(struct ext2_inode_info
, i_data
),
221 if (ext2_inode_cachep
== NULL
)
226 static void destroy_inodecache(void)
229 * Make sure all delayed rcu free inodes are flushed before we
233 kmem_cache_destroy(ext2_inode_cachep
);
236 static int ext2_show_options(struct seq_file
*seq
, struct dentry
*root
)
238 struct super_block
*sb
= root
->d_sb
;
239 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
240 struct ext2_super_block
*es
= sbi
->s_es
;
241 unsigned long def_mount_opts
;
243 spin_lock(&sbi
->s_lock
);
244 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
246 if (sbi
->s_sb_block
!= 1)
247 seq_printf(seq
, ",sb=%lu", sbi
->s_sb_block
);
248 if (test_opt(sb
, MINIX_DF
))
249 seq_puts(seq
, ",minixdf");
250 if (test_opt(sb
, GRPID
))
251 seq_puts(seq
, ",grpid");
252 if (!test_opt(sb
, GRPID
) && (def_mount_opts
& EXT2_DEFM_BSDGROUPS
))
253 seq_puts(seq
, ",nogrpid");
254 if (!uid_eq(sbi
->s_resuid
, make_kuid(&init_user_ns
, EXT2_DEF_RESUID
)) ||
255 le16_to_cpu(es
->s_def_resuid
) != EXT2_DEF_RESUID
) {
256 seq_printf(seq
, ",resuid=%u",
257 from_kuid_munged(&init_user_ns
, sbi
->s_resuid
));
259 if (!gid_eq(sbi
->s_resgid
, make_kgid(&init_user_ns
, EXT2_DEF_RESGID
)) ||
260 le16_to_cpu(es
->s_def_resgid
) != EXT2_DEF_RESGID
) {
261 seq_printf(seq
, ",resgid=%u",
262 from_kgid_munged(&init_user_ns
, sbi
->s_resgid
));
264 if (test_opt(sb
, ERRORS_RO
)) {
265 int def_errors
= le16_to_cpu(es
->s_errors
);
267 if (def_errors
== EXT2_ERRORS_PANIC
||
268 def_errors
== EXT2_ERRORS_CONTINUE
) {
269 seq_puts(seq
, ",errors=remount-ro");
272 if (test_opt(sb
, ERRORS_CONT
))
273 seq_puts(seq
, ",errors=continue");
274 if (test_opt(sb
, ERRORS_PANIC
))
275 seq_puts(seq
, ",errors=panic");
276 if (test_opt(sb
, NO_UID32
))
277 seq_puts(seq
, ",nouid32");
278 if (test_opt(sb
, DEBUG
))
279 seq_puts(seq
, ",debug");
280 if (test_opt(sb
, OLDALLOC
))
281 seq_puts(seq
, ",oldalloc");
283 #ifdef CONFIG_EXT2_FS_XATTR
284 if (test_opt(sb
, XATTR_USER
))
285 seq_puts(seq
, ",user_xattr");
286 if (!test_opt(sb
, XATTR_USER
) &&
287 (def_mount_opts
& EXT2_DEFM_XATTR_USER
)) {
288 seq_puts(seq
, ",nouser_xattr");
292 #ifdef CONFIG_EXT2_FS_POSIX_ACL
293 if (test_opt(sb
, POSIX_ACL
))
294 seq_puts(seq
, ",acl");
295 if (!test_opt(sb
, POSIX_ACL
) && (def_mount_opts
& EXT2_DEFM_ACL
))
296 seq_puts(seq
, ",noacl");
299 if (test_opt(sb
, NOBH
))
300 seq_puts(seq
, ",nobh");
302 if (test_opt(sb
, USRQUOTA
))
303 seq_puts(seq
, ",usrquota");
305 if (test_opt(sb
, GRPQUOTA
))
306 seq_puts(seq
, ",grpquota");
308 if (test_opt(sb
, XIP
))
309 seq_puts(seq
, ",xip");
311 if (test_opt(sb
, DAX
))
312 seq_puts(seq
, ",dax");
314 if (!test_opt(sb
, RESERVATION
))
315 seq_puts(seq
, ",noreservation");
317 spin_unlock(&sbi
->s_lock
);
322 static ssize_t
ext2_quota_read(struct super_block
*sb
, int type
, char *data
, size_t len
, loff_t off
);
323 static ssize_t
ext2_quota_write(struct super_block
*sb
, int type
, const char *data
, size_t len
, loff_t off
);
324 static int ext2_quota_on(struct super_block
*sb
, int type
, int format_id
,
325 const struct path
*path
);
326 static struct dquot
**ext2_get_dquots(struct inode
*inode
)
328 return EXT2_I(inode
)->i_dquot
;
331 static const struct quotactl_ops ext2_quotactl_ops
= {
332 .quota_on
= ext2_quota_on
,
333 .quota_off
= ext2_quota_off
,
334 .quota_sync
= dquot_quota_sync
,
335 .get_state
= dquot_get_state
,
336 .set_info
= dquot_set_dqinfo
,
337 .get_dqblk
= dquot_get_dqblk
,
338 .set_dqblk
= dquot_set_dqblk
,
339 .get_nextdqblk
= dquot_get_next_dqblk
,
343 static const struct super_operations ext2_sops
= {
344 .alloc_inode
= ext2_alloc_inode
,
345 .free_inode
= ext2_free_in_core_inode
,
346 .write_inode
= ext2_write_inode
,
347 .evict_inode
= ext2_evict_inode
,
348 .put_super
= ext2_put_super
,
349 .sync_fs
= ext2_sync_fs
,
350 .freeze_fs
= ext2_freeze
,
351 .unfreeze_fs
= ext2_unfreeze
,
352 .statfs
= ext2_statfs
,
353 .remount_fs
= ext2_remount
,
354 .show_options
= ext2_show_options
,
356 .quota_read
= ext2_quota_read
,
357 .quota_write
= ext2_quota_write
,
358 .get_dquots
= ext2_get_dquots
,
362 static struct inode
*ext2_nfs_get_inode(struct super_block
*sb
,
363 u64 ino
, u32 generation
)
367 if (ino
< EXT2_FIRST_INO(sb
) && ino
!= EXT2_ROOT_INO
)
368 return ERR_PTR(-ESTALE
);
369 if (ino
> le32_to_cpu(EXT2_SB(sb
)->s_es
->s_inodes_count
))
370 return ERR_PTR(-ESTALE
);
373 * ext2_iget isn't quite right if the inode is currently unallocated!
374 * However ext2_iget currently does appropriate checks to handle stale
375 * inodes so everything is OK.
377 inode
= ext2_iget(sb
, ino
);
379 return ERR_CAST(inode
);
380 if (generation
&& inode
->i_generation
!= generation
) {
381 /* we didn't find the right inode.. */
383 return ERR_PTR(-ESTALE
);
388 static struct dentry
*ext2_fh_to_dentry(struct super_block
*sb
, struct fid
*fid
,
389 int fh_len
, int fh_type
)
391 return generic_fh_to_dentry(sb
, fid
, fh_len
, fh_type
,
395 static struct dentry
*ext2_fh_to_parent(struct super_block
*sb
, struct fid
*fid
,
396 int fh_len
, int fh_type
)
398 return generic_fh_to_parent(sb
, fid
, fh_len
, fh_type
,
402 static const struct export_operations ext2_export_ops
= {
403 .fh_to_dentry
= ext2_fh_to_dentry
,
404 .fh_to_parent
= ext2_fh_to_parent
,
405 .get_parent
= ext2_get_parent
,
408 static unsigned long get_sb_block(void **data
)
410 unsigned long sb_block
;
411 char *options
= (char *) *data
;
413 if (!options
|| strncmp(options
, "sb=", 3) != 0)
414 return 1; /* Default location */
416 sb_block
= simple_strtoul(options
, &options
, 0);
417 if (*options
&& *options
!= ',') {
418 printk("EXT2-fs: Invalid sb specification: %s\n",
424 *data
= (void *) options
;
429 Opt_bsd_df
, Opt_minix_df
, Opt_grpid
, Opt_nogrpid
,
430 Opt_resgid
, Opt_resuid
, Opt_sb
, Opt_err_cont
, Opt_err_panic
,
431 Opt_err_ro
, Opt_nouid32
, Opt_debug
,
432 Opt_oldalloc
, Opt_orlov
, Opt_nobh
, Opt_user_xattr
, Opt_nouser_xattr
,
433 Opt_acl
, Opt_noacl
, Opt_xip
, Opt_dax
, Opt_ignore
, Opt_err
, Opt_quota
,
434 Opt_usrquota
, Opt_grpquota
, Opt_reservation
, Opt_noreservation
437 static const match_table_t tokens
= {
438 {Opt_bsd_df
, "bsddf"},
439 {Opt_minix_df
, "minixdf"},
440 {Opt_grpid
, "grpid"},
441 {Opt_grpid
, "bsdgroups"},
442 {Opt_nogrpid
, "nogrpid"},
443 {Opt_nogrpid
, "sysvgroups"},
444 {Opt_resgid
, "resgid=%u"},
445 {Opt_resuid
, "resuid=%u"},
447 {Opt_err_cont
, "errors=continue"},
448 {Opt_err_panic
, "errors=panic"},
449 {Opt_err_ro
, "errors=remount-ro"},
450 {Opt_nouid32
, "nouid32"},
451 {Opt_debug
, "debug"},
452 {Opt_oldalloc
, "oldalloc"},
453 {Opt_orlov
, "orlov"},
455 {Opt_user_xattr
, "user_xattr"},
456 {Opt_nouser_xattr
, "nouser_xattr"},
458 {Opt_noacl
, "noacl"},
461 {Opt_grpquota
, "grpquota"},
462 {Opt_ignore
, "noquota"},
463 {Opt_quota
, "quota"},
464 {Opt_usrquota
, "usrquota"},
465 {Opt_reservation
, "reservation"},
466 {Opt_noreservation
, "noreservation"},
470 static int parse_options(char *options
, struct super_block
*sb
,
471 struct ext2_mount_options
*opts
)
474 substring_t args
[MAX_OPT_ARGS
];
482 while ((p
= strsep (&options
, ",")) != NULL
) {
487 token
= match_token(p
, tokens
, args
);
490 clear_opt (opts
->s_mount_opt
, MINIX_DF
);
493 set_opt (opts
->s_mount_opt
, MINIX_DF
);
496 set_opt (opts
->s_mount_opt
, GRPID
);
499 clear_opt (opts
->s_mount_opt
, GRPID
);
502 if (match_int(&args
[0], &option
))
504 uid
= make_kuid(current_user_ns(), option
);
505 if (!uid_valid(uid
)) {
506 ext2_msg(sb
, KERN_ERR
, "Invalid uid value %d", option
);
510 opts
->s_resuid
= uid
;
513 if (match_int(&args
[0], &option
))
515 gid
= make_kgid(current_user_ns(), option
);
516 if (!gid_valid(gid
)) {
517 ext2_msg(sb
, KERN_ERR
, "Invalid gid value %d", option
);
520 opts
->s_resgid
= gid
;
523 /* handled by get_sb_block() instead of here */
524 /* *sb_block = match_int(&args[0]); */
527 clear_opt (opts
->s_mount_opt
, ERRORS_CONT
);
528 clear_opt (opts
->s_mount_opt
, ERRORS_RO
);
529 set_opt (opts
->s_mount_opt
, ERRORS_PANIC
);
532 clear_opt (opts
->s_mount_opt
, ERRORS_CONT
);
533 clear_opt (opts
->s_mount_opt
, ERRORS_PANIC
);
534 set_opt (opts
->s_mount_opt
, ERRORS_RO
);
537 clear_opt (opts
->s_mount_opt
, ERRORS_RO
);
538 clear_opt (opts
->s_mount_opt
, ERRORS_PANIC
);
539 set_opt (opts
->s_mount_opt
, ERRORS_CONT
);
542 set_opt (opts
->s_mount_opt
, NO_UID32
);
545 set_opt (opts
->s_mount_opt
, DEBUG
);
548 set_opt (opts
->s_mount_opt
, OLDALLOC
);
551 clear_opt (opts
->s_mount_opt
, OLDALLOC
);
554 set_opt (opts
->s_mount_opt
, NOBH
);
556 #ifdef CONFIG_EXT2_FS_XATTR
558 set_opt (opts
->s_mount_opt
, XATTR_USER
);
560 case Opt_nouser_xattr
:
561 clear_opt (opts
->s_mount_opt
, XATTR_USER
);
565 case Opt_nouser_xattr
:
566 ext2_msg(sb
, KERN_INFO
, "(no)user_xattr options"
570 #ifdef CONFIG_EXT2_FS_POSIX_ACL
572 set_opt(opts
->s_mount_opt
, POSIX_ACL
);
575 clear_opt(opts
->s_mount_opt
, POSIX_ACL
);
580 ext2_msg(sb
, KERN_INFO
,
581 "(no)acl options not supported");
585 ext2_msg(sb
, KERN_INFO
, "use dax instead of xip");
586 set_opt(opts
->s_mount_opt
, XIP
);
590 ext2_msg(sb
, KERN_WARNING
,
591 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
592 set_opt(opts
->s_mount_opt
, DAX
);
594 ext2_msg(sb
, KERN_INFO
, "dax option not supported");
598 #if defined(CONFIG_QUOTA)
601 set_opt(opts
->s_mount_opt
, USRQUOTA
);
605 set_opt(opts
->s_mount_opt
, GRPQUOTA
);
611 ext2_msg(sb
, KERN_INFO
,
612 "quota operations not supported");
616 case Opt_reservation
:
617 set_opt(opts
->s_mount_opt
, RESERVATION
);
618 ext2_msg(sb
, KERN_INFO
, "reservations ON");
620 case Opt_noreservation
:
621 clear_opt(opts
->s_mount_opt
, RESERVATION
);
622 ext2_msg(sb
, KERN_INFO
, "reservations OFF");
633 static int ext2_setup_super (struct super_block
* sb
,
634 struct ext2_super_block
* es
,
638 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
640 if (le32_to_cpu(es
->s_rev_level
) > EXT2_MAX_SUPP_REV
) {
641 ext2_msg(sb
, KERN_ERR
,
642 "error: revision level too high, "
643 "forcing read-only mode");
648 if (!(sbi
->s_mount_state
& EXT2_VALID_FS
))
649 ext2_msg(sb
, KERN_WARNING
,
650 "warning: mounting unchecked fs, "
651 "running e2fsck is recommended");
652 else if ((sbi
->s_mount_state
& EXT2_ERROR_FS
))
653 ext2_msg(sb
, KERN_WARNING
,
654 "warning: mounting fs with errors, "
655 "running e2fsck is recommended");
656 else if ((__s16
) le16_to_cpu(es
->s_max_mnt_count
) >= 0 &&
657 le16_to_cpu(es
->s_mnt_count
) >=
658 (unsigned short) (__s16
) le16_to_cpu(es
->s_max_mnt_count
))
659 ext2_msg(sb
, KERN_WARNING
,
660 "warning: maximal mount count reached, "
661 "running e2fsck is recommended");
662 else if (le32_to_cpu(es
->s_checkinterval
) &&
663 (le32_to_cpu(es
->s_lastcheck
) +
664 le32_to_cpu(es
->s_checkinterval
) <=
665 ktime_get_real_seconds()))
666 ext2_msg(sb
, KERN_WARNING
,
667 "warning: checktime reached, "
668 "running e2fsck is recommended");
669 if (!le16_to_cpu(es
->s_max_mnt_count
))
670 es
->s_max_mnt_count
= cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT
);
671 le16_add_cpu(&es
->s_mnt_count
, 1);
672 if (test_opt (sb
, DEBUG
))
673 ext2_msg(sb
, KERN_INFO
, "%s, %s, bs=%lu, fs=%lu, gc=%lu, "
674 "bpg=%lu, ipg=%lu, mo=%04lx]",
675 EXT2FS_VERSION
, EXT2FS_DATE
, sb
->s_blocksize
,
678 EXT2_BLOCKS_PER_GROUP(sb
),
679 EXT2_INODES_PER_GROUP(sb
),
684 static int ext2_check_descriptors(struct super_block
*sb
)
687 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
689 ext2_debug ("Checking group descriptors");
691 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
692 struct ext2_group_desc
*gdp
= ext2_get_group_desc(sb
, i
, NULL
);
693 ext2_fsblk_t first_block
= ext2_group_first_block_no(sb
, i
);
694 ext2_fsblk_t last_block
= ext2_group_last_block_no(sb
, i
);
696 if (le32_to_cpu(gdp
->bg_block_bitmap
) < first_block
||
697 le32_to_cpu(gdp
->bg_block_bitmap
) > last_block
)
699 ext2_error (sb
, "ext2_check_descriptors",
700 "Block bitmap for group %d"
701 " not in group (block %lu)!",
702 i
, (unsigned long) le32_to_cpu(gdp
->bg_block_bitmap
));
705 if (le32_to_cpu(gdp
->bg_inode_bitmap
) < first_block
||
706 le32_to_cpu(gdp
->bg_inode_bitmap
) > last_block
)
708 ext2_error (sb
, "ext2_check_descriptors",
709 "Inode bitmap for group %d"
710 " not in group (block %lu)!",
711 i
, (unsigned long) le32_to_cpu(gdp
->bg_inode_bitmap
));
714 if (le32_to_cpu(gdp
->bg_inode_table
) < first_block
||
715 le32_to_cpu(gdp
->bg_inode_table
) + sbi
->s_itb_per_group
- 1 >
718 ext2_error (sb
, "ext2_check_descriptors",
719 "Inode table for group %d"
720 " not in group (block %lu)!",
721 i
, (unsigned long) le32_to_cpu(gdp
->bg_inode_table
));
729 * Maximal file size. There is a direct, and {,double-,triple-}indirect
730 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
731 * We need to be 1 filesystem block less than the 2^32 sector limit.
733 static loff_t
ext2_max_size(int bits
)
735 loff_t res
= EXT2_NDIR_BLOCKS
;
737 unsigned int upper_limit
;
738 unsigned int ppb
= 1 << (bits
-2);
740 /* This is calculated to be the largest file size for a
741 * dense, file such that the total number of
742 * sectors in the file, including data and all indirect blocks,
743 * does not exceed 2^32 -1
744 * __u32 i_blocks representing the total number of
745 * 512 bytes blocks of the file
747 upper_limit
= (1LL << 32) - 1;
749 /* total blocks in file system block size */
750 upper_limit
>>= (bits
- 9);
752 /* Compute how many blocks we can address by block tree */
753 res
+= 1LL << (bits
-2);
754 res
+= 1LL << (2*(bits
-2));
755 res
+= 1LL << (3*(bits
-2));
756 /* Does block tree limit file size? */
757 if (res
< upper_limit
)
761 /* How many metadata blocks are needed for addressing upper_limit? */
762 upper_limit
-= EXT2_NDIR_BLOCKS
;
763 /* indirect blocks */
766 /* double indirect blocks */
767 if (upper_limit
< ppb
* ppb
) {
768 meta_blocks
+= 1 + DIV_ROUND_UP(upper_limit
, ppb
);
772 meta_blocks
+= 1 + ppb
;
773 upper_limit
-= ppb
* ppb
;
774 /* tripple indirect blocks for the rest */
775 meta_blocks
+= 1 + DIV_ROUND_UP(upper_limit
, ppb
) +
776 DIV_ROUND_UP(upper_limit
, ppb
*ppb
);
780 if (res
> MAX_LFS_FILESIZE
)
781 res
= MAX_LFS_FILESIZE
;
786 static unsigned long descriptor_loc(struct super_block
*sb
,
787 unsigned long logic_sb_block
,
790 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
791 unsigned long bg
, first_meta_bg
;
793 first_meta_bg
= le32_to_cpu(sbi
->s_es
->s_first_meta_bg
);
795 if (!EXT2_HAS_INCOMPAT_FEATURE(sb
, EXT2_FEATURE_INCOMPAT_META_BG
) ||
797 return (logic_sb_block
+ nr
+ 1);
798 bg
= sbi
->s_desc_per_block
* nr
;
800 return ext2_group_first_block_no(sb
, bg
) + ext2_bg_has_super(sb
, bg
);
803 static int ext2_fill_super(struct super_block
*sb
, void *data
, int silent
)
805 struct dax_device
*dax_dev
= fs_dax_get_by_bdev(sb
->s_bdev
);
806 struct buffer_head
* bh
;
807 struct ext2_sb_info
* sbi
;
808 struct ext2_super_block
* es
;
811 unsigned long sb_block
= get_sb_block(&data
);
812 unsigned long logic_sb_block
;
813 unsigned long offset
= 0;
814 unsigned long def_mount_opts
;
816 int blocksize
= BLOCK_SIZE
;
821 struct ext2_mount_options opts
;
823 sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
827 sbi
->s_blockgroup_lock
=
828 kzalloc(sizeof(struct blockgroup_lock
), GFP_KERNEL
);
829 if (!sbi
->s_blockgroup_lock
) {
834 sbi
->s_sb_block
= sb_block
;
835 sbi
->s_daxdev
= dax_dev
;
837 spin_lock_init(&sbi
->s_lock
);
841 * See what the current blocksize for the device is, and
842 * use that as the blocksize. Otherwise (or if the blocksize
843 * is smaller than the default) use the default.
844 * This is important for devices that have a hardware
845 * sectorsize that is larger than the default.
847 blocksize
= sb_min_blocksize(sb
, BLOCK_SIZE
);
849 ext2_msg(sb
, KERN_ERR
, "error: unable to set blocksize");
854 * If the superblock doesn't start on a hardware sector boundary,
855 * calculate the offset.
857 if (blocksize
!= BLOCK_SIZE
) {
858 logic_sb_block
= (sb_block
*BLOCK_SIZE
) / blocksize
;
859 offset
= (sb_block
*BLOCK_SIZE
) % blocksize
;
861 logic_sb_block
= sb_block
;
864 if (!(bh
= sb_bread(sb
, logic_sb_block
))) {
865 ext2_msg(sb
, KERN_ERR
, "error: unable to read superblock");
869 * Note: s_es must be initialized as soon as possible because
870 * some ext2 macro-instructions depend on its value
872 es
= (struct ext2_super_block
*) (((char *)bh
->b_data
) + offset
);
874 sb
->s_magic
= le16_to_cpu(es
->s_magic
);
876 if (sb
->s_magic
!= EXT2_SUPER_MAGIC
)
879 opts
.s_mount_opt
= 0;
880 /* Set defaults before we parse the mount options */
881 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
882 if (def_mount_opts
& EXT2_DEFM_DEBUG
)
883 set_opt(opts
.s_mount_opt
, DEBUG
);
884 if (def_mount_opts
& EXT2_DEFM_BSDGROUPS
)
885 set_opt(opts
.s_mount_opt
, GRPID
);
886 if (def_mount_opts
& EXT2_DEFM_UID16
)
887 set_opt(opts
.s_mount_opt
, NO_UID32
);
888 #ifdef CONFIG_EXT2_FS_XATTR
889 if (def_mount_opts
& EXT2_DEFM_XATTR_USER
)
890 set_opt(opts
.s_mount_opt
, XATTR_USER
);
892 #ifdef CONFIG_EXT2_FS_POSIX_ACL
893 if (def_mount_opts
& EXT2_DEFM_ACL
)
894 set_opt(opts
.s_mount_opt
, POSIX_ACL
);
897 if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT2_ERRORS_PANIC
)
898 set_opt(opts
.s_mount_opt
, ERRORS_PANIC
);
899 else if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT2_ERRORS_CONTINUE
)
900 set_opt(opts
.s_mount_opt
, ERRORS_CONT
);
902 set_opt(opts
.s_mount_opt
, ERRORS_RO
);
904 opts
.s_resuid
= make_kuid(&init_user_ns
, le16_to_cpu(es
->s_def_resuid
));
905 opts
.s_resgid
= make_kgid(&init_user_ns
, le16_to_cpu(es
->s_def_resgid
));
907 set_opt(opts
.s_mount_opt
, RESERVATION
);
909 if (!parse_options((char *) data
, sb
, &opts
))
912 sbi
->s_mount_opt
= opts
.s_mount_opt
;
913 sbi
->s_resuid
= opts
.s_resuid
;
914 sbi
->s_resgid
= opts
.s_resgid
;
916 sb
->s_flags
= (sb
->s_flags
& ~SB_POSIXACL
) |
917 (test_opt(sb
, POSIX_ACL
) ? SB_POSIXACL
: 0);
918 sb
->s_iflags
|= SB_I_CGROUPWB
;
920 if (le32_to_cpu(es
->s_rev_level
) == EXT2_GOOD_OLD_REV
&&
921 (EXT2_HAS_COMPAT_FEATURE(sb
, ~0U) ||
922 EXT2_HAS_RO_COMPAT_FEATURE(sb
, ~0U) ||
923 EXT2_HAS_INCOMPAT_FEATURE(sb
, ~0U)))
924 ext2_msg(sb
, KERN_WARNING
,
925 "warning: feature flags set on rev 0 fs, "
926 "running e2fsck is recommended");
928 * Check feature flags regardless of the revision level, since we
929 * previously didn't change the revision level when setting the flags,
930 * so there is a chance incompat flags are set on a rev 0 filesystem.
932 features
= EXT2_HAS_INCOMPAT_FEATURE(sb
, ~EXT2_FEATURE_INCOMPAT_SUPP
);
934 ext2_msg(sb
, KERN_ERR
, "error: couldn't mount because of "
935 "unsupported optional features (%x)",
936 le32_to_cpu(features
));
939 if (!sb_rdonly(sb
) && (features
= EXT2_HAS_RO_COMPAT_FEATURE(sb
, ~EXT2_FEATURE_RO_COMPAT_SUPP
))){
940 ext2_msg(sb
, KERN_ERR
, "error: couldn't mount RDWR because of "
941 "unsupported optional features (%x)",
942 le32_to_cpu(features
));
946 blocksize
= BLOCK_SIZE
<< le32_to_cpu(sbi
->s_es
->s_log_block_size
);
948 if (test_opt(sb
, DAX
)) {
949 if (!bdev_dax_supported(sb
->s_bdev
, blocksize
)) {
950 ext2_msg(sb
, KERN_ERR
,
951 "DAX unsupported by block device. Turning off DAX.");
952 clear_opt(sbi
->s_mount_opt
, DAX
);
956 /* If the blocksize doesn't match, re-read the thing.. */
957 if (sb
->s_blocksize
!= blocksize
) {
960 if (!sb_set_blocksize(sb
, blocksize
)) {
961 ext2_msg(sb
, KERN_ERR
,
962 "error: bad blocksize %d", blocksize
);
966 logic_sb_block
= (sb_block
*BLOCK_SIZE
) / blocksize
;
967 offset
= (sb_block
*BLOCK_SIZE
) % blocksize
;
968 bh
= sb_bread(sb
, logic_sb_block
);
970 ext2_msg(sb
, KERN_ERR
, "error: couldn't read"
971 "superblock on 2nd try");
974 es
= (struct ext2_super_block
*) (((char *)bh
->b_data
) + offset
);
976 if (es
->s_magic
!= cpu_to_le16(EXT2_SUPER_MAGIC
)) {
977 ext2_msg(sb
, KERN_ERR
, "error: magic mismatch");
982 sb
->s_maxbytes
= ext2_max_size(sb
->s_blocksize_bits
);
983 sb
->s_max_links
= EXT2_LINK_MAX
;
984 sb
->s_time_min
= S32_MIN
;
985 sb
->s_time_max
= S32_MAX
;
987 if (le32_to_cpu(es
->s_rev_level
) == EXT2_GOOD_OLD_REV
) {
988 sbi
->s_inode_size
= EXT2_GOOD_OLD_INODE_SIZE
;
989 sbi
->s_first_ino
= EXT2_GOOD_OLD_FIRST_INO
;
991 sbi
->s_inode_size
= le16_to_cpu(es
->s_inode_size
);
992 sbi
->s_first_ino
= le32_to_cpu(es
->s_first_ino
);
993 if ((sbi
->s_inode_size
< EXT2_GOOD_OLD_INODE_SIZE
) ||
994 !is_power_of_2(sbi
->s_inode_size
) ||
995 (sbi
->s_inode_size
> blocksize
)) {
996 ext2_msg(sb
, KERN_ERR
,
997 "error: unsupported inode size: %d",
1003 sbi
->s_frag_size
= EXT2_MIN_FRAG_SIZE
<<
1004 le32_to_cpu(es
->s_log_frag_size
);
1005 if (sbi
->s_frag_size
== 0)
1007 sbi
->s_frags_per_block
= sb
->s_blocksize
/ sbi
->s_frag_size
;
1009 sbi
->s_blocks_per_group
= le32_to_cpu(es
->s_blocks_per_group
);
1010 sbi
->s_frags_per_group
= le32_to_cpu(es
->s_frags_per_group
);
1011 sbi
->s_inodes_per_group
= le32_to_cpu(es
->s_inodes_per_group
);
1013 sbi
->s_inodes_per_block
= sb
->s_blocksize
/ EXT2_INODE_SIZE(sb
);
1014 if (sbi
->s_inodes_per_block
== 0 || sbi
->s_inodes_per_group
== 0)
1016 sbi
->s_itb_per_group
= sbi
->s_inodes_per_group
/
1017 sbi
->s_inodes_per_block
;
1018 sbi
->s_desc_per_block
= sb
->s_blocksize
/
1019 sizeof (struct ext2_group_desc
);
1021 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
1022 sbi
->s_addr_per_block_bits
=
1023 ilog2 (EXT2_ADDR_PER_BLOCK(sb
));
1024 sbi
->s_desc_per_block_bits
=
1025 ilog2 (EXT2_DESC_PER_BLOCK(sb
));
1027 if (sb
->s_magic
!= EXT2_SUPER_MAGIC
)
1030 if (sb
->s_blocksize
!= bh
->b_size
) {
1032 ext2_msg(sb
, KERN_ERR
, "error: unsupported blocksize");
1036 if (sb
->s_blocksize
!= sbi
->s_frag_size
) {
1037 ext2_msg(sb
, KERN_ERR
,
1038 "error: fragsize %lu != blocksize %lu"
1039 "(not supported yet)",
1040 sbi
->s_frag_size
, sb
->s_blocksize
);
1044 if (sbi
->s_blocks_per_group
> sb
->s_blocksize
* 8) {
1045 ext2_msg(sb
, KERN_ERR
,
1046 "error: #blocks per group too big: %lu",
1047 sbi
->s_blocks_per_group
);
1050 if (sbi
->s_frags_per_group
> sb
->s_blocksize
* 8) {
1051 ext2_msg(sb
, KERN_ERR
,
1052 "error: #fragments per group too big: %lu",
1053 sbi
->s_frags_per_group
);
1056 if (sbi
->s_inodes_per_group
> sb
->s_blocksize
* 8) {
1057 ext2_msg(sb
, KERN_ERR
,
1058 "error: #inodes per group too big: %lu",
1059 sbi
->s_inodes_per_group
);
1063 if (EXT2_BLOCKS_PER_GROUP(sb
) == 0)
1065 sbi
->s_groups_count
= ((le32_to_cpu(es
->s_blocks_count
) -
1066 le32_to_cpu(es
->s_first_data_block
) - 1)
1067 / EXT2_BLOCKS_PER_GROUP(sb
)) + 1;
1068 db_count
= (sbi
->s_groups_count
+ EXT2_DESC_PER_BLOCK(sb
) - 1) /
1069 EXT2_DESC_PER_BLOCK(sb
);
1070 sbi
->s_group_desc
= kmalloc_array(db_count
,
1071 sizeof(struct buffer_head
*),
1073 if (sbi
->s_group_desc
== NULL
) {
1075 ext2_msg(sb
, KERN_ERR
, "error: not enough memory");
1078 bgl_lock_init(sbi
->s_blockgroup_lock
);
1079 sbi
->s_debts
= kcalloc(sbi
->s_groups_count
, sizeof(*sbi
->s_debts
), GFP_KERNEL
);
1080 if (!sbi
->s_debts
) {
1082 ext2_msg(sb
, KERN_ERR
, "error: not enough memory");
1083 goto failed_mount_group_desc
;
1085 for (i
= 0; i
< db_count
; i
++) {
1086 block
= descriptor_loc(sb
, logic_sb_block
, i
);
1087 sbi
->s_group_desc
[i
] = sb_bread(sb
, block
);
1088 if (!sbi
->s_group_desc
[i
]) {
1089 for (j
= 0; j
< i
; j
++)
1090 brelse (sbi
->s_group_desc
[j
]);
1091 ext2_msg(sb
, KERN_ERR
,
1092 "error: unable to read group descriptors");
1093 goto failed_mount_group_desc
;
1096 if (!ext2_check_descriptors (sb
)) {
1097 ext2_msg(sb
, KERN_ERR
, "group descriptors corrupted");
1100 sbi
->s_gdb_count
= db_count
;
1101 get_random_bytes(&sbi
->s_next_generation
, sizeof(u32
));
1102 spin_lock_init(&sbi
->s_next_gen_lock
);
1104 /* per filesystem reservation list head & lock */
1105 spin_lock_init(&sbi
->s_rsv_window_lock
);
1106 sbi
->s_rsv_window_root
= RB_ROOT
;
1108 * Add a single, static dummy reservation to the start of the
1109 * reservation window list --- it gives us a placeholder for
1110 * append-at-start-of-list which makes the allocation logic
1113 sbi
->s_rsv_window_head
.rsv_start
= EXT2_RESERVE_WINDOW_NOT_ALLOCATED
;
1114 sbi
->s_rsv_window_head
.rsv_end
= EXT2_RESERVE_WINDOW_NOT_ALLOCATED
;
1115 sbi
->s_rsv_window_head
.rsv_alloc_hit
= 0;
1116 sbi
->s_rsv_window_head
.rsv_goal_size
= 0;
1117 ext2_rsv_window_add(sb
, &sbi
->s_rsv_window_head
);
1119 err
= percpu_counter_init(&sbi
->s_freeblocks_counter
,
1120 ext2_count_free_blocks(sb
), GFP_KERNEL
);
1122 err
= percpu_counter_init(&sbi
->s_freeinodes_counter
,
1123 ext2_count_free_inodes(sb
), GFP_KERNEL
);
1126 err
= percpu_counter_init(&sbi
->s_dirs_counter
,
1127 ext2_count_dirs(sb
), GFP_KERNEL
);
1131 ext2_msg(sb
, KERN_ERR
, "error: insufficient memory");
1135 #ifdef CONFIG_EXT2_FS_XATTR
1136 sbi
->s_ea_block_cache
= ext2_xattr_create_cache();
1137 if (!sbi
->s_ea_block_cache
) {
1139 ext2_msg(sb
, KERN_ERR
, "Failed to create ea_block_cache");
1144 * set up enough so that it can read an inode
1146 sb
->s_op
= &ext2_sops
;
1147 sb
->s_export_op
= &ext2_export_ops
;
1148 sb
->s_xattr
= ext2_xattr_handlers
;
1151 sb
->dq_op
= &dquot_operations
;
1152 sb
->s_qcop
= &ext2_quotactl_ops
;
1153 sb
->s_quota_types
= QTYPE_MASK_USR
| QTYPE_MASK_GRP
;
1156 root
= ext2_iget(sb
, EXT2_ROOT_INO
);
1158 ret
= PTR_ERR(root
);
1161 if (!S_ISDIR(root
->i_mode
) || !root
->i_blocks
|| !root
->i_size
) {
1163 ext2_msg(sb
, KERN_ERR
, "error: corrupt root inode, run e2fsck");
1167 sb
->s_root
= d_make_root(root
);
1169 ext2_msg(sb
, KERN_ERR
, "error: get root inode failed");
1173 if (EXT2_HAS_COMPAT_FEATURE(sb
, EXT3_FEATURE_COMPAT_HAS_JOURNAL
))
1174 ext2_msg(sb
, KERN_WARNING
,
1175 "warning: mounting ext3 filesystem as ext2");
1176 if (ext2_setup_super (sb
, es
, sb_rdonly(sb
)))
1177 sb
->s_flags
|= SB_RDONLY
;
1178 ext2_write_super(sb
);
1183 ext2_msg(sb
, KERN_ERR
,
1184 "error: can't find an ext2 filesystem on dev %s.",
1188 ext2_xattr_destroy_cache(sbi
->s_ea_block_cache
);
1189 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
1190 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
1191 percpu_counter_destroy(&sbi
->s_dirs_counter
);
1193 for (i
= 0; i
< db_count
; i
++)
1194 brelse(sbi
->s_group_desc
[i
]);
1195 failed_mount_group_desc
:
1196 kfree(sbi
->s_group_desc
);
1197 kfree(sbi
->s_debts
);
1201 sb
->s_fs_info
= NULL
;
1202 kfree(sbi
->s_blockgroup_lock
);
1205 fs_put_dax(dax_dev
);
1209 static void ext2_clear_super_error(struct super_block
*sb
)
1211 struct buffer_head
*sbh
= EXT2_SB(sb
)->s_sbh
;
1213 if (buffer_write_io_error(sbh
)) {
1215 * Oh, dear. A previous attempt to write the
1216 * superblock failed. This could happen because the
1217 * USB device was yanked out. Or it could happen to
1218 * be a transient write error and maybe the block will
1219 * be remapped. Nothing we can do but to retry the
1220 * write and hope for the best.
1222 ext2_msg(sb
, KERN_ERR
,
1223 "previous I/O error to superblock detected");
1224 clear_buffer_write_io_error(sbh
);
1225 set_buffer_uptodate(sbh
);
1229 void ext2_sync_super(struct super_block
*sb
, struct ext2_super_block
*es
,
1232 ext2_clear_super_error(sb
);
1233 spin_lock(&EXT2_SB(sb
)->s_lock
);
1234 es
->s_free_blocks_count
= cpu_to_le32(ext2_count_free_blocks(sb
));
1235 es
->s_free_inodes_count
= cpu_to_le32(ext2_count_free_inodes(sb
));
1236 es
->s_wtime
= cpu_to_le32(ktime_get_real_seconds());
1237 /* unlock before we do IO */
1238 spin_unlock(&EXT2_SB(sb
)->s_lock
);
1239 mark_buffer_dirty(EXT2_SB(sb
)->s_sbh
);
1241 sync_dirty_buffer(EXT2_SB(sb
)->s_sbh
);
1245 * In the second extended file system, it is not necessary to
1246 * write the super block since we use a mapping of the
1247 * disk super block in a buffer.
1249 * However, this function is still used to set the fs valid
1250 * flags to 0. We need to set this flag to 0 since the fs
1251 * may have been checked while mounted and e2fsck may have
1252 * set s_state to EXT2_VALID_FS after some corrections.
1254 static int ext2_sync_fs(struct super_block
*sb
, int wait
)
1256 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
1257 struct ext2_super_block
*es
= EXT2_SB(sb
)->s_es
;
1260 * Write quota structures to quota file, sync_blockdev() will write
1261 * them to disk later
1263 dquot_writeback_dquots(sb
, -1);
1265 spin_lock(&sbi
->s_lock
);
1266 if (es
->s_state
& cpu_to_le16(EXT2_VALID_FS
)) {
1267 ext2_debug("setting valid to 0\n");
1268 es
->s_state
&= cpu_to_le16(~EXT2_VALID_FS
);
1270 spin_unlock(&sbi
->s_lock
);
1271 ext2_sync_super(sb
, es
, wait
);
1275 static int ext2_freeze(struct super_block
*sb
)
1277 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
1280 * Open but unlinked files present? Keep EXT2_VALID_FS flag cleared
1281 * because we have unattached inodes and thus filesystem is not fully
1284 if (atomic_long_read(&sb
->s_remove_count
)) {
1285 ext2_sync_fs(sb
, 1);
1288 /* Set EXT2_FS_VALID flag */
1289 spin_lock(&sbi
->s_lock
);
1290 sbi
->s_es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
1291 spin_unlock(&sbi
->s_lock
);
1292 ext2_sync_super(sb
, sbi
->s_es
, 1);
1297 static int ext2_unfreeze(struct super_block
*sb
)
1299 /* Just write sb to clear EXT2_VALID_FS flag */
1300 ext2_write_super(sb
);
1305 static void ext2_write_super(struct super_block
*sb
)
1308 ext2_sync_fs(sb
, 1);
1311 static int ext2_remount (struct super_block
* sb
, int * flags
, char * data
)
1313 struct ext2_sb_info
* sbi
= EXT2_SB(sb
);
1314 struct ext2_super_block
* es
;
1315 struct ext2_mount_options new_opts
;
1318 sync_filesystem(sb
);
1320 spin_lock(&sbi
->s_lock
);
1321 new_opts
.s_mount_opt
= sbi
->s_mount_opt
;
1322 new_opts
.s_resuid
= sbi
->s_resuid
;
1323 new_opts
.s_resgid
= sbi
->s_resgid
;
1324 spin_unlock(&sbi
->s_lock
);
1326 if (!parse_options(data
, sb
, &new_opts
))
1329 spin_lock(&sbi
->s_lock
);
1331 if ((sbi
->s_mount_opt
^ new_opts
.s_mount_opt
) & EXT2_MOUNT_DAX
) {
1332 ext2_msg(sb
, KERN_WARNING
, "warning: refusing change of "
1333 "dax flag with busy inodes while remounting");
1334 new_opts
.s_mount_opt
^= EXT2_MOUNT_DAX
;
1336 if ((bool)(*flags
& SB_RDONLY
) == sb_rdonly(sb
))
1338 if (*flags
& SB_RDONLY
) {
1339 if (le16_to_cpu(es
->s_state
) & EXT2_VALID_FS
||
1340 !(sbi
->s_mount_state
& EXT2_VALID_FS
))
1344 * OK, we are remounting a valid rw partition rdonly, so set
1345 * the rdonly flag and then mark the partition as valid again.
1347 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
1348 es
->s_mtime
= cpu_to_le32(ktime_get_real_seconds());
1349 spin_unlock(&sbi
->s_lock
);
1351 err
= dquot_suspend(sb
, -1);
1355 ext2_sync_super(sb
, es
, 1);
1357 __le32 ret
= EXT2_HAS_RO_COMPAT_FEATURE(sb
,
1358 ~EXT2_FEATURE_RO_COMPAT_SUPP
);
1360 spin_unlock(&sbi
->s_lock
);
1361 ext2_msg(sb
, KERN_WARNING
,
1362 "warning: couldn't remount RDWR because of "
1363 "unsupported optional features (%x).",
1368 * Mounting a RDONLY partition read-write, so reread and
1369 * store the current valid flag. (It may have been changed
1370 * by e2fsck since we originally mounted the partition.)
1372 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
1373 if (!ext2_setup_super (sb
, es
, 0))
1374 sb
->s_flags
&= ~SB_RDONLY
;
1375 spin_unlock(&sbi
->s_lock
);
1377 ext2_write_super(sb
);
1379 dquot_resume(sb
, -1);
1382 spin_lock(&sbi
->s_lock
);
1384 sbi
->s_mount_opt
= new_opts
.s_mount_opt
;
1385 sbi
->s_resuid
= new_opts
.s_resuid
;
1386 sbi
->s_resgid
= new_opts
.s_resgid
;
1387 sb
->s_flags
= (sb
->s_flags
& ~SB_POSIXACL
) |
1388 (test_opt(sb
, POSIX_ACL
) ? SB_POSIXACL
: 0);
1389 spin_unlock(&sbi
->s_lock
);
1394 static int ext2_statfs (struct dentry
* dentry
, struct kstatfs
* buf
)
1396 struct super_block
*sb
= dentry
->d_sb
;
1397 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
1398 struct ext2_super_block
*es
= sbi
->s_es
;
1400 spin_lock(&sbi
->s_lock
);
1402 if (test_opt (sb
, MINIX_DF
))
1403 sbi
->s_overhead_last
= 0;
1404 else if (sbi
->s_blocks_last
!= le32_to_cpu(es
->s_blocks_count
)) {
1405 unsigned long i
, overhead
= 0;
1409 * Compute the overhead (FS structures). This is constant
1410 * for a given filesystem unless the number of block groups
1411 * changes so we cache the previous value until it does.
1415 * All of the blocks before first_data_block are
1418 overhead
= le32_to_cpu(es
->s_first_data_block
);
1421 * Add the overhead attributed to the superblock and
1422 * block group descriptors. If the sparse superblocks
1423 * feature is turned on, then not all groups have this.
1425 for (i
= 0; i
< sbi
->s_groups_count
; i
++)
1426 overhead
+= ext2_bg_has_super(sb
, i
) +
1427 ext2_bg_num_gdb(sb
, i
);
1430 * Every block group has an inode bitmap, a block
1431 * bitmap, and an inode table.
1433 overhead
+= (sbi
->s_groups_count
*
1434 (2 + sbi
->s_itb_per_group
));
1435 sbi
->s_overhead_last
= overhead
;
1437 sbi
->s_blocks_last
= le32_to_cpu(es
->s_blocks_count
);
1440 buf
->f_type
= EXT2_SUPER_MAGIC
;
1441 buf
->f_bsize
= sb
->s_blocksize
;
1442 buf
->f_blocks
= le32_to_cpu(es
->s_blocks_count
) - sbi
->s_overhead_last
;
1443 buf
->f_bfree
= ext2_count_free_blocks(sb
);
1444 es
->s_free_blocks_count
= cpu_to_le32(buf
->f_bfree
);
1445 buf
->f_bavail
= buf
->f_bfree
- le32_to_cpu(es
->s_r_blocks_count
);
1446 if (buf
->f_bfree
< le32_to_cpu(es
->s_r_blocks_count
))
1448 buf
->f_files
= le32_to_cpu(es
->s_inodes_count
);
1449 buf
->f_ffree
= ext2_count_free_inodes(sb
);
1450 es
->s_free_inodes_count
= cpu_to_le32(buf
->f_ffree
);
1451 buf
->f_namelen
= EXT2_NAME_LEN
;
1452 buf
->f_fsid
= uuid_to_fsid(es
->s_uuid
);
1453 spin_unlock(&sbi
->s_lock
);
1457 static struct dentry
*ext2_mount(struct file_system_type
*fs_type
,
1458 int flags
, const char *dev_name
, void *data
)
1460 return mount_bdev(fs_type
, flags
, dev_name
, data
, ext2_fill_super
);
1465 /* Read data from quotafile - avoid pagecache and such because we cannot afford
1466 * acquiring the locks... As quota files are never truncated and quota code
1467 * itself serializes the operations (and no one else should touch the files)
1468 * we don't have to be afraid of races */
1469 static ssize_t
ext2_quota_read(struct super_block
*sb
, int type
, char *data
,
1470 size_t len
, loff_t off
)
1472 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
1473 sector_t blk
= off
>> EXT2_BLOCK_SIZE_BITS(sb
);
1475 int offset
= off
& (sb
->s_blocksize
- 1);
1478 struct buffer_head tmp_bh
;
1479 struct buffer_head
*bh
;
1480 loff_t i_size
= i_size_read(inode
);
1484 if (off
+len
> i_size
)
1487 while (toread
> 0) {
1488 tocopy
= sb
->s_blocksize
- offset
< toread
?
1489 sb
->s_blocksize
- offset
: toread
;
1492 tmp_bh
.b_size
= sb
->s_blocksize
;
1493 err
= ext2_get_block(inode
, blk
, &tmp_bh
, 0);
1496 if (!buffer_mapped(&tmp_bh
)) /* A hole? */
1497 memset(data
, 0, tocopy
);
1499 bh
= sb_bread(sb
, tmp_bh
.b_blocknr
);
1502 memcpy(data
, bh
->b_data
+offset
, tocopy
);
1513 /* Write to quotafile */
1514 static ssize_t
ext2_quota_write(struct super_block
*sb
, int type
,
1515 const char *data
, size_t len
, loff_t off
)
1517 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
1518 sector_t blk
= off
>> EXT2_BLOCK_SIZE_BITS(sb
);
1520 int offset
= off
& (sb
->s_blocksize
- 1);
1522 size_t towrite
= len
;
1523 struct buffer_head tmp_bh
;
1524 struct buffer_head
*bh
;
1526 while (towrite
> 0) {
1527 tocopy
= sb
->s_blocksize
- offset
< towrite
?
1528 sb
->s_blocksize
- offset
: towrite
;
1531 tmp_bh
.b_size
= sb
->s_blocksize
;
1532 err
= ext2_get_block(inode
, blk
, &tmp_bh
, 1);
1535 if (offset
|| tocopy
!= EXT2_BLOCK_SIZE(sb
))
1536 bh
= sb_bread(sb
, tmp_bh
.b_blocknr
);
1538 bh
= sb_getblk(sb
, tmp_bh
.b_blocknr
);
1539 if (unlikely(!bh
)) {
1544 memcpy(bh
->b_data
+offset
, data
, tocopy
);
1545 flush_dcache_page(bh
->b_page
);
1546 set_buffer_uptodate(bh
);
1547 mark_buffer_dirty(bh
);
1558 if (inode
->i_size
< off
+len
-towrite
)
1559 i_size_write(inode
, off
+len
-towrite
);
1560 inode_inc_iversion(inode
);
1561 inode
->i_mtime
= inode
->i_ctime
= current_time(inode
);
1562 mark_inode_dirty(inode
);
1563 return len
- towrite
;
1566 static int ext2_quota_on(struct super_block
*sb
, int type
, int format_id
,
1567 const struct path
*path
)
1570 struct inode
*inode
;
1572 err
= dquot_quota_on(sb
, type
, format_id
, path
);
1576 inode
= d_inode(path
->dentry
);
1578 EXT2_I(inode
)->i_flags
|= EXT2_NOATIME_FL
| EXT2_IMMUTABLE_FL
;
1579 inode_set_flags(inode
, S_NOATIME
| S_IMMUTABLE
,
1580 S_NOATIME
| S_IMMUTABLE
);
1581 inode_unlock(inode
);
1582 mark_inode_dirty(inode
);
1587 static int ext2_quota_off(struct super_block
*sb
, int type
)
1589 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
1592 if (!inode
|| !igrab(inode
))
1595 err
= dquot_quota_off(sb
, type
);
1600 EXT2_I(inode
)->i_flags
&= ~(EXT2_NOATIME_FL
| EXT2_IMMUTABLE_FL
);
1601 inode_set_flags(inode
, 0, S_NOATIME
| S_IMMUTABLE
);
1602 inode_unlock(inode
);
1603 mark_inode_dirty(inode
);
1608 return dquot_quota_off(sb
, type
);
1613 static struct file_system_type ext2_fs_type
= {
1614 .owner
= THIS_MODULE
,
1616 .mount
= ext2_mount
,
1617 .kill_sb
= kill_block_super
,
1618 .fs_flags
= FS_REQUIRES_DEV
,
1620 MODULE_ALIAS_FS("ext2");
1622 static int __init
init_ext2_fs(void)
1626 err
= init_inodecache();
1629 err
= register_filesystem(&ext2_fs_type
);
1634 destroy_inodecache();
1638 static void __exit
exit_ext2_fs(void)
1640 unregister_filesystem(&ext2_fs_type
);
1641 destroy_inodecache();
1644 MODULE_AUTHOR("Remy Card and others");
1645 MODULE_DESCRIPTION("Second Extended Filesystem");
1646 MODULE_LICENSE("GPL");
1647 module_init(init_ext2_fs
)
1648 module_exit(exit_ext2_fs
)