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 <linux/uaccess.h>
35 #include <linux/dax.h>
40 static void ext2_write_super(struct super_block
*sb
);
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
;
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
|= SB_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.
127 static int ext2_quota_off(struct super_block
*sb
, int type
);
129 static void ext2_quota_off_umount(struct super_block
*sb
)
133 for (type
= 0; type
< MAXQUOTAS
; type
++)
134 ext2_quota_off(sb
, type
);
137 static inline void ext2_quota_off_umount(struct super_block
*sb
)
142 static void ext2_put_super (struct super_block
* sb
)
146 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
148 ext2_quota_off_umount(sb
);
150 if (sbi
->s_ea_block_cache
) {
151 ext2_xattr_destroy_cache(sbi
->s_ea_block_cache
);
152 sbi
->s_ea_block_cache
= NULL
;
154 if (!sb_rdonly(sb
)) {
155 struct ext2_super_block
*es
= sbi
->s_es
;
157 spin_lock(&sbi
->s_lock
);
158 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
159 spin_unlock(&sbi
->s_lock
);
160 ext2_sync_super(sb
, es
, 1);
162 db_count
= sbi
->s_gdb_count
;
163 for (i
= 0; i
< db_count
; i
++)
164 if (sbi
->s_group_desc
[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 ei
->vfs_inode
.i_version
= 1;
189 memset(&ei
->i_dquot
, 0, sizeof(ei
->i_dquot
));
192 return &ei
->vfs_inode
;
195 static void ext2_i_callback(struct rcu_head
*head
)
197 struct inode
*inode
= container_of(head
, struct inode
, i_rcu
);
198 kmem_cache_free(ext2_inode_cachep
, EXT2_I(inode
));
201 static void ext2_destroy_inode(struct inode
*inode
)
203 call_rcu(&inode
->i_rcu
, ext2_i_callback
);
206 static void init_once(void *foo
)
208 struct ext2_inode_info
*ei
= (struct ext2_inode_info
*) foo
;
210 rwlock_init(&ei
->i_meta_lock
);
211 #ifdef CONFIG_EXT2_FS_XATTR
212 init_rwsem(&ei
->xattr_sem
);
214 mutex_init(&ei
->truncate_mutex
);
216 init_rwsem(&ei
->dax_sem
);
218 inode_init_once(&ei
->vfs_inode
);
221 static int __init
init_inodecache(void)
223 ext2_inode_cachep
= kmem_cache_create("ext2_inode_cache",
224 sizeof(struct ext2_inode_info
),
225 0, (SLAB_RECLAIM_ACCOUNT
|
226 SLAB_MEM_SPREAD
|SLAB_ACCOUNT
),
228 if (ext2_inode_cachep
== NULL
)
233 static void destroy_inodecache(void)
236 * Make sure all delayed rcu free inodes are flushed before we
240 kmem_cache_destroy(ext2_inode_cachep
);
243 static int ext2_show_options(struct seq_file
*seq
, struct dentry
*root
)
245 struct super_block
*sb
= root
->d_sb
;
246 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
247 struct ext2_super_block
*es
= sbi
->s_es
;
248 unsigned long def_mount_opts
;
250 spin_lock(&sbi
->s_lock
);
251 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
253 if (sbi
->s_sb_block
!= 1)
254 seq_printf(seq
, ",sb=%lu", sbi
->s_sb_block
);
255 if (test_opt(sb
, MINIX_DF
))
256 seq_puts(seq
, ",minixdf");
257 if (test_opt(sb
, GRPID
))
258 seq_puts(seq
, ",grpid");
259 if (!test_opt(sb
, GRPID
) && (def_mount_opts
& EXT2_DEFM_BSDGROUPS
))
260 seq_puts(seq
, ",nogrpid");
261 if (!uid_eq(sbi
->s_resuid
, make_kuid(&init_user_ns
, EXT2_DEF_RESUID
)) ||
262 le16_to_cpu(es
->s_def_resuid
) != EXT2_DEF_RESUID
) {
263 seq_printf(seq
, ",resuid=%u",
264 from_kuid_munged(&init_user_ns
, sbi
->s_resuid
));
266 if (!gid_eq(sbi
->s_resgid
, make_kgid(&init_user_ns
, EXT2_DEF_RESGID
)) ||
267 le16_to_cpu(es
->s_def_resgid
) != EXT2_DEF_RESGID
) {
268 seq_printf(seq
, ",resgid=%u",
269 from_kgid_munged(&init_user_ns
, sbi
->s_resgid
));
271 if (test_opt(sb
, ERRORS_RO
)) {
272 int def_errors
= le16_to_cpu(es
->s_errors
);
274 if (def_errors
== EXT2_ERRORS_PANIC
||
275 def_errors
== EXT2_ERRORS_CONTINUE
) {
276 seq_puts(seq
, ",errors=remount-ro");
279 if (test_opt(sb
, ERRORS_CONT
))
280 seq_puts(seq
, ",errors=continue");
281 if (test_opt(sb
, ERRORS_PANIC
))
282 seq_puts(seq
, ",errors=panic");
283 if (test_opt(sb
, NO_UID32
))
284 seq_puts(seq
, ",nouid32");
285 if (test_opt(sb
, DEBUG
))
286 seq_puts(seq
, ",debug");
287 if (test_opt(sb
, OLDALLOC
))
288 seq_puts(seq
, ",oldalloc");
290 #ifdef CONFIG_EXT2_FS_XATTR
291 if (test_opt(sb
, XATTR_USER
))
292 seq_puts(seq
, ",user_xattr");
293 if (!test_opt(sb
, XATTR_USER
) &&
294 (def_mount_opts
& EXT2_DEFM_XATTR_USER
)) {
295 seq_puts(seq
, ",nouser_xattr");
299 #ifdef CONFIG_EXT2_FS_POSIX_ACL
300 if (test_opt(sb
, POSIX_ACL
))
301 seq_puts(seq
, ",acl");
302 if (!test_opt(sb
, POSIX_ACL
) && (def_mount_opts
& EXT2_DEFM_ACL
))
303 seq_puts(seq
, ",noacl");
306 if (test_opt(sb
, NOBH
))
307 seq_puts(seq
, ",nobh");
309 #if defined(CONFIG_QUOTA)
310 if (sbi
->s_mount_opt
& EXT2_MOUNT_USRQUOTA
)
311 seq_puts(seq
, ",usrquota");
313 if (sbi
->s_mount_opt
& EXT2_MOUNT_GRPQUOTA
)
314 seq_puts(seq
, ",grpquota");
318 if (sbi
->s_mount_opt
& EXT2_MOUNT_XIP
)
319 seq_puts(seq
, ",xip");
320 if (sbi
->s_mount_opt
& EXT2_MOUNT_DAX
)
321 seq_puts(seq
, ",dax");
324 if (!test_opt(sb
, RESERVATION
))
325 seq_puts(seq
, ",noreservation");
327 spin_unlock(&sbi
->s_lock
);
332 static ssize_t
ext2_quota_read(struct super_block
*sb
, int type
, char *data
, size_t len
, loff_t off
);
333 static ssize_t
ext2_quota_write(struct super_block
*sb
, int type
, const char *data
, size_t len
, loff_t off
);
334 static int ext2_quota_on(struct super_block
*sb
, int type
, int format_id
,
335 const struct path
*path
);
336 static struct dquot
**ext2_get_dquots(struct inode
*inode
)
338 return EXT2_I(inode
)->i_dquot
;
341 static const struct quotactl_ops ext2_quotactl_ops
= {
342 .quota_on
= ext2_quota_on
,
343 .quota_off
= ext2_quota_off
,
344 .quota_sync
= dquot_quota_sync
,
345 .get_state
= dquot_get_state
,
346 .set_info
= dquot_set_dqinfo
,
347 .get_dqblk
= dquot_get_dqblk
,
348 .set_dqblk
= dquot_set_dqblk
,
349 .get_nextdqblk
= dquot_get_next_dqblk
,
353 static const struct super_operations ext2_sops
= {
354 .alloc_inode
= ext2_alloc_inode
,
355 .destroy_inode
= ext2_destroy_inode
,
356 .write_inode
= ext2_write_inode
,
357 .evict_inode
= ext2_evict_inode
,
358 .put_super
= ext2_put_super
,
359 .sync_fs
= ext2_sync_fs
,
360 .freeze_fs
= ext2_freeze
,
361 .unfreeze_fs
= ext2_unfreeze
,
362 .statfs
= ext2_statfs
,
363 .remount_fs
= ext2_remount
,
364 .show_options
= ext2_show_options
,
366 .quota_read
= ext2_quota_read
,
367 .quota_write
= ext2_quota_write
,
368 .get_dquots
= ext2_get_dquots
,
372 static struct inode
*ext2_nfs_get_inode(struct super_block
*sb
,
373 u64 ino
, u32 generation
)
377 if (ino
< EXT2_FIRST_INO(sb
) && ino
!= EXT2_ROOT_INO
)
378 return ERR_PTR(-ESTALE
);
379 if (ino
> le32_to_cpu(EXT2_SB(sb
)->s_es
->s_inodes_count
))
380 return ERR_PTR(-ESTALE
);
383 * ext2_iget isn't quite right if the inode is currently unallocated!
384 * However ext2_iget currently does appropriate checks to handle stale
385 * inodes so everything is OK.
387 inode
= ext2_iget(sb
, ino
);
389 return ERR_CAST(inode
);
390 if (generation
&& inode
->i_generation
!= generation
) {
391 /* we didn't find the right inode.. */
393 return ERR_PTR(-ESTALE
);
398 static struct dentry
*ext2_fh_to_dentry(struct super_block
*sb
, struct fid
*fid
,
399 int fh_len
, int fh_type
)
401 return generic_fh_to_dentry(sb
, fid
, fh_len
, fh_type
,
405 static struct dentry
*ext2_fh_to_parent(struct super_block
*sb
, struct fid
*fid
,
406 int fh_len
, int fh_type
)
408 return generic_fh_to_parent(sb
, fid
, fh_len
, fh_type
,
412 static const struct export_operations ext2_export_ops
= {
413 .fh_to_dentry
= ext2_fh_to_dentry
,
414 .fh_to_parent
= ext2_fh_to_parent
,
415 .get_parent
= ext2_get_parent
,
418 static unsigned long get_sb_block(void **data
)
420 unsigned long sb_block
;
421 char *options
= (char *) *data
;
423 if (!options
|| strncmp(options
, "sb=", 3) != 0)
424 return 1; /* Default location */
426 sb_block
= simple_strtoul(options
, &options
, 0);
427 if (*options
&& *options
!= ',') {
428 printk("EXT2-fs: Invalid sb specification: %s\n",
434 *data
= (void *) options
;
439 Opt_bsd_df
, Opt_minix_df
, Opt_grpid
, Opt_nogrpid
,
440 Opt_resgid
, Opt_resuid
, Opt_sb
, Opt_err_cont
, Opt_err_panic
,
441 Opt_err_ro
, Opt_nouid32
, Opt_nocheck
, Opt_debug
,
442 Opt_oldalloc
, Opt_orlov
, Opt_nobh
, Opt_user_xattr
, Opt_nouser_xattr
,
443 Opt_acl
, Opt_noacl
, Opt_xip
, Opt_dax
, Opt_ignore
, Opt_err
, Opt_quota
,
444 Opt_usrquota
, Opt_grpquota
, Opt_reservation
, Opt_noreservation
447 static const match_table_t tokens
= {
448 {Opt_bsd_df
, "bsddf"},
449 {Opt_minix_df
, "minixdf"},
450 {Opt_grpid
, "grpid"},
451 {Opt_grpid
, "bsdgroups"},
452 {Opt_nogrpid
, "nogrpid"},
453 {Opt_nogrpid
, "sysvgroups"},
454 {Opt_resgid
, "resgid=%u"},
455 {Opt_resuid
, "resuid=%u"},
457 {Opt_err_cont
, "errors=continue"},
458 {Opt_err_panic
, "errors=panic"},
459 {Opt_err_ro
, "errors=remount-ro"},
460 {Opt_nouid32
, "nouid32"},
461 {Opt_nocheck
, "check=none"},
462 {Opt_nocheck
, "nocheck"},
463 {Opt_debug
, "debug"},
464 {Opt_oldalloc
, "oldalloc"},
465 {Opt_orlov
, "orlov"},
467 {Opt_user_xattr
, "user_xattr"},
468 {Opt_nouser_xattr
, "nouser_xattr"},
470 {Opt_noacl
, "noacl"},
473 {Opt_grpquota
, "grpquota"},
474 {Opt_ignore
, "noquota"},
475 {Opt_quota
, "quota"},
476 {Opt_usrquota
, "usrquota"},
477 {Opt_reservation
, "reservation"},
478 {Opt_noreservation
, "noreservation"},
482 static int parse_options(char *options
, struct super_block
*sb
,
483 struct ext2_mount_options
*opts
)
486 substring_t args
[MAX_OPT_ARGS
];
494 while ((p
= strsep (&options
, ",")) != NULL
) {
499 token
= match_token(p
, tokens
, args
);
502 clear_opt (opts
->s_mount_opt
, MINIX_DF
);
505 set_opt (opts
->s_mount_opt
, MINIX_DF
);
508 set_opt (opts
->s_mount_opt
, GRPID
);
511 clear_opt (opts
->s_mount_opt
, GRPID
);
514 if (match_int(&args
[0], &option
))
516 uid
= make_kuid(current_user_ns(), option
);
517 if (!uid_valid(uid
)) {
518 ext2_msg(sb
, KERN_ERR
, "Invalid uid value %d", option
);
522 opts
->s_resuid
= uid
;
525 if (match_int(&args
[0], &option
))
527 gid
= make_kgid(current_user_ns(), option
);
528 if (!gid_valid(gid
)) {
529 ext2_msg(sb
, KERN_ERR
, "Invalid gid value %d", option
);
532 opts
->s_resgid
= gid
;
535 /* handled by get_sb_block() instead of here */
536 /* *sb_block = match_int(&args[0]); */
539 clear_opt (opts
->s_mount_opt
, ERRORS_CONT
);
540 clear_opt (opts
->s_mount_opt
, ERRORS_RO
);
541 set_opt (opts
->s_mount_opt
, ERRORS_PANIC
);
544 clear_opt (opts
->s_mount_opt
, ERRORS_CONT
);
545 clear_opt (opts
->s_mount_opt
, ERRORS_PANIC
);
546 set_opt (opts
->s_mount_opt
, ERRORS_RO
);
549 clear_opt (opts
->s_mount_opt
, ERRORS_RO
);
550 clear_opt (opts
->s_mount_opt
, ERRORS_PANIC
);
551 set_opt (opts
->s_mount_opt
, ERRORS_CONT
);
554 set_opt (opts
->s_mount_opt
, NO_UID32
);
557 clear_opt (opts
->s_mount_opt
, CHECK
);
560 set_opt (opts
->s_mount_opt
, DEBUG
);
563 set_opt (opts
->s_mount_opt
, OLDALLOC
);
566 clear_opt (opts
->s_mount_opt
, OLDALLOC
);
569 set_opt (opts
->s_mount_opt
, NOBH
);
571 #ifdef CONFIG_EXT2_FS_XATTR
573 set_opt (opts
->s_mount_opt
, XATTR_USER
);
575 case Opt_nouser_xattr
:
576 clear_opt (opts
->s_mount_opt
, XATTR_USER
);
580 case Opt_nouser_xattr
:
581 ext2_msg(sb
, KERN_INFO
, "(no)user_xattr options"
585 #ifdef CONFIG_EXT2_FS_POSIX_ACL
587 set_opt(opts
->s_mount_opt
, POSIX_ACL
);
590 clear_opt(opts
->s_mount_opt
, POSIX_ACL
);
595 ext2_msg(sb
, KERN_INFO
,
596 "(no)acl options not supported");
600 ext2_msg(sb
, KERN_INFO
, "use dax instead of xip");
601 set_opt(opts
->s_mount_opt
, XIP
);
605 ext2_msg(sb
, KERN_WARNING
,
606 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
607 set_opt(opts
->s_mount_opt
, DAX
);
609 ext2_msg(sb
, KERN_INFO
, "dax option not supported");
613 #if defined(CONFIG_QUOTA)
616 set_opt(opts
->s_mount_opt
, USRQUOTA
);
620 set_opt(opts
->s_mount_opt
, GRPQUOTA
);
626 ext2_msg(sb
, KERN_INFO
,
627 "quota operations not supported");
631 case Opt_reservation
:
632 set_opt(opts
->s_mount_opt
, RESERVATION
);
633 ext2_msg(sb
, KERN_INFO
, "reservations ON");
635 case Opt_noreservation
:
636 clear_opt(opts
->s_mount_opt
, RESERVATION
);
637 ext2_msg(sb
, KERN_INFO
, "reservations OFF");
648 static int ext2_setup_super (struct super_block
* sb
,
649 struct ext2_super_block
* es
,
653 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
655 if (le32_to_cpu(es
->s_rev_level
) > EXT2_MAX_SUPP_REV
) {
656 ext2_msg(sb
, KERN_ERR
,
657 "error: revision level too high, "
658 "forcing read-only mode");
663 if (!(sbi
->s_mount_state
& EXT2_VALID_FS
))
664 ext2_msg(sb
, KERN_WARNING
,
665 "warning: mounting unchecked fs, "
666 "running e2fsck is recommended");
667 else if ((sbi
->s_mount_state
& EXT2_ERROR_FS
))
668 ext2_msg(sb
, KERN_WARNING
,
669 "warning: mounting fs with errors, "
670 "running e2fsck is recommended");
671 else if ((__s16
) le16_to_cpu(es
->s_max_mnt_count
) >= 0 &&
672 le16_to_cpu(es
->s_mnt_count
) >=
673 (unsigned short) (__s16
) le16_to_cpu(es
->s_max_mnt_count
))
674 ext2_msg(sb
, KERN_WARNING
,
675 "warning: maximal mount count reached, "
676 "running e2fsck is recommended");
677 else if (le32_to_cpu(es
->s_checkinterval
) &&
678 (le32_to_cpu(es
->s_lastcheck
) +
679 le32_to_cpu(es
->s_checkinterval
) <= get_seconds()))
680 ext2_msg(sb
, KERN_WARNING
,
681 "warning: checktime reached, "
682 "running e2fsck is recommended");
683 if (!le16_to_cpu(es
->s_max_mnt_count
))
684 es
->s_max_mnt_count
= cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT
);
685 le16_add_cpu(&es
->s_mnt_count
, 1);
686 if (test_opt (sb
, DEBUG
))
687 ext2_msg(sb
, KERN_INFO
, "%s, %s, bs=%lu, fs=%lu, gc=%lu, "
688 "bpg=%lu, ipg=%lu, mo=%04lx]",
689 EXT2FS_VERSION
, EXT2FS_DATE
, sb
->s_blocksize
,
692 EXT2_BLOCKS_PER_GROUP(sb
),
693 EXT2_INODES_PER_GROUP(sb
),
698 static int ext2_check_descriptors(struct super_block
*sb
)
701 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
703 ext2_debug ("Checking group descriptors");
705 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
706 struct ext2_group_desc
*gdp
= ext2_get_group_desc(sb
, i
, NULL
);
707 ext2_fsblk_t first_block
= ext2_group_first_block_no(sb
, i
);
708 ext2_fsblk_t last_block
;
710 if (i
== sbi
->s_groups_count
- 1)
711 last_block
= le32_to_cpu(sbi
->s_es
->s_blocks_count
) - 1;
713 last_block
= first_block
+
714 (EXT2_BLOCKS_PER_GROUP(sb
) - 1);
716 if (le32_to_cpu(gdp
->bg_block_bitmap
) < first_block
||
717 le32_to_cpu(gdp
->bg_block_bitmap
) > last_block
)
719 ext2_error (sb
, "ext2_check_descriptors",
720 "Block bitmap for group %d"
721 " not in group (block %lu)!",
722 i
, (unsigned long) le32_to_cpu(gdp
->bg_block_bitmap
));
725 if (le32_to_cpu(gdp
->bg_inode_bitmap
) < first_block
||
726 le32_to_cpu(gdp
->bg_inode_bitmap
) > last_block
)
728 ext2_error (sb
, "ext2_check_descriptors",
729 "Inode bitmap for group %d"
730 " not in group (block %lu)!",
731 i
, (unsigned long) le32_to_cpu(gdp
->bg_inode_bitmap
));
734 if (le32_to_cpu(gdp
->bg_inode_table
) < first_block
||
735 le32_to_cpu(gdp
->bg_inode_table
) + sbi
->s_itb_per_group
- 1 >
738 ext2_error (sb
, "ext2_check_descriptors",
739 "Inode table for group %d"
740 " not in group (block %lu)!",
741 i
, (unsigned long) le32_to_cpu(gdp
->bg_inode_table
));
749 * Maximal file size. There is a direct, and {,double-,triple-}indirect
750 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
751 * We need to be 1 filesystem block less than the 2^32 sector limit.
753 static loff_t
ext2_max_size(int bits
)
755 loff_t res
= EXT2_NDIR_BLOCKS
;
759 /* This is calculated to be the largest file size for a
760 * dense, file such that the total number of
761 * sectors in the file, including data and all indirect blocks,
762 * does not exceed 2^32 -1
763 * __u32 i_blocks representing the total number of
764 * 512 bytes blocks of the file
766 upper_limit
= (1LL << 32) - 1;
768 /* total blocks in file system block size */
769 upper_limit
>>= (bits
- 9);
772 /* indirect blocks */
774 /* double indirect blocks */
775 meta_blocks
+= 1 + (1LL << (bits
-2));
776 /* tripple indirect blocks */
777 meta_blocks
+= 1 + (1LL << (bits
-2)) + (1LL << (2*(bits
-2)));
779 upper_limit
-= meta_blocks
;
780 upper_limit
<<= bits
;
782 res
+= 1LL << (bits
-2);
783 res
+= 1LL << (2*(bits
-2));
784 res
+= 1LL << (3*(bits
-2));
786 if (res
> upper_limit
)
789 if (res
> MAX_LFS_FILESIZE
)
790 res
= MAX_LFS_FILESIZE
;
795 static unsigned long descriptor_loc(struct super_block
*sb
,
796 unsigned long logic_sb_block
,
799 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
800 unsigned long bg
, first_meta_bg
;
803 first_meta_bg
= le32_to_cpu(sbi
->s_es
->s_first_meta_bg
);
805 if (!EXT2_HAS_INCOMPAT_FEATURE(sb
, EXT2_FEATURE_INCOMPAT_META_BG
) ||
807 return (logic_sb_block
+ nr
+ 1);
808 bg
= sbi
->s_desc_per_block
* nr
;
809 if (ext2_bg_has_super(sb
, bg
))
812 return ext2_group_first_block_no(sb
, bg
) + has_super
;
815 static int ext2_fill_super(struct super_block
*sb
, void *data
, int silent
)
817 struct dax_device
*dax_dev
= fs_dax_get_by_bdev(sb
->s_bdev
);
818 struct buffer_head
* bh
;
819 struct ext2_sb_info
* sbi
;
820 struct ext2_super_block
* es
;
823 unsigned long sb_block
= get_sb_block(&data
);
824 unsigned long logic_sb_block
;
825 unsigned long offset
= 0;
826 unsigned long def_mount_opts
;
828 int blocksize
= BLOCK_SIZE
;
833 struct ext2_mount_options opts
;
836 sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
840 sbi
->s_blockgroup_lock
=
841 kzalloc(sizeof(struct blockgroup_lock
), GFP_KERNEL
);
842 if (!sbi
->s_blockgroup_lock
) {
847 sbi
->s_sb_block
= sb_block
;
848 sbi
->s_daxdev
= dax_dev
;
850 spin_lock_init(&sbi
->s_lock
);
853 * See what the current blocksize for the device is, and
854 * use that as the blocksize. Otherwise (or if the blocksize
855 * is smaller than the default) use the default.
856 * This is important for devices that have a hardware
857 * sectorsize that is larger than the default.
859 blocksize
= sb_min_blocksize(sb
, BLOCK_SIZE
);
861 ext2_msg(sb
, KERN_ERR
, "error: unable to set blocksize");
866 * If the superblock doesn't start on a hardware sector boundary,
867 * calculate the offset.
869 if (blocksize
!= BLOCK_SIZE
) {
870 logic_sb_block
= (sb_block
*BLOCK_SIZE
) / blocksize
;
871 offset
= (sb_block
*BLOCK_SIZE
) % blocksize
;
873 logic_sb_block
= sb_block
;
876 if (!(bh
= sb_bread(sb
, logic_sb_block
))) {
877 ext2_msg(sb
, KERN_ERR
, "error: unable to read superblock");
881 * Note: s_es must be initialized as soon as possible because
882 * some ext2 macro-instructions depend on its value
884 es
= (struct ext2_super_block
*) (((char *)bh
->b_data
) + offset
);
886 sb
->s_magic
= le16_to_cpu(es
->s_magic
);
888 if (sb
->s_magic
!= EXT2_SUPER_MAGIC
)
891 /* Set defaults before we parse the mount options */
892 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
893 if (def_mount_opts
& EXT2_DEFM_DEBUG
)
894 set_opt(opts
.s_mount_opt
, DEBUG
);
895 if (def_mount_opts
& EXT2_DEFM_BSDGROUPS
)
896 set_opt(opts
.s_mount_opt
, GRPID
);
897 if (def_mount_opts
& EXT2_DEFM_UID16
)
898 set_opt(opts
.s_mount_opt
, NO_UID32
);
899 #ifdef CONFIG_EXT2_FS_XATTR
900 if (def_mount_opts
& EXT2_DEFM_XATTR_USER
)
901 set_opt(opts
.s_mount_opt
, XATTR_USER
);
903 #ifdef CONFIG_EXT2_FS_POSIX_ACL
904 if (def_mount_opts
& EXT2_DEFM_ACL
)
905 set_opt(opts
.s_mount_opt
, POSIX_ACL
);
908 if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT2_ERRORS_PANIC
)
909 set_opt(opts
.s_mount_opt
, ERRORS_PANIC
);
910 else if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT2_ERRORS_CONTINUE
)
911 set_opt(opts
.s_mount_opt
, ERRORS_CONT
);
913 set_opt(opts
.s_mount_opt
, ERRORS_RO
);
915 opts
.s_resuid
= make_kuid(&init_user_ns
, le16_to_cpu(es
->s_def_resuid
));
916 opts
.s_resgid
= make_kgid(&init_user_ns
, le16_to_cpu(es
->s_def_resgid
));
918 set_opt(opts
.s_mount_opt
, RESERVATION
);
920 if (!parse_options((char *) data
, sb
, &opts
))
923 sbi
->s_mount_opt
= opts
.s_mount_opt
;
924 sbi
->s_resuid
= opts
.s_resuid
;
925 sbi
->s_resgid
= opts
.s_resgid
;
927 sb
->s_flags
= (sb
->s_flags
& ~SB_POSIXACL
) |
928 ((EXT2_SB(sb
)->s_mount_opt
& EXT2_MOUNT_POSIX_ACL
) ?
930 sb
->s_iflags
|= SB_I_CGROUPWB
;
932 if (le32_to_cpu(es
->s_rev_level
) == EXT2_GOOD_OLD_REV
&&
933 (EXT2_HAS_COMPAT_FEATURE(sb
, ~0U) ||
934 EXT2_HAS_RO_COMPAT_FEATURE(sb
, ~0U) ||
935 EXT2_HAS_INCOMPAT_FEATURE(sb
, ~0U)))
936 ext2_msg(sb
, KERN_WARNING
,
937 "warning: feature flags set on rev 0 fs, "
938 "running e2fsck is recommended");
940 * Check feature flags regardless of the revision level, since we
941 * previously didn't change the revision level when setting the flags,
942 * so there is a chance incompat flags are set on a rev 0 filesystem.
944 features
= EXT2_HAS_INCOMPAT_FEATURE(sb
, ~EXT2_FEATURE_INCOMPAT_SUPP
);
946 ext2_msg(sb
, KERN_ERR
, "error: couldn't mount because of "
947 "unsupported optional features (%x)",
948 le32_to_cpu(features
));
951 if (!sb_rdonly(sb
) && (features
= EXT2_HAS_RO_COMPAT_FEATURE(sb
, ~EXT2_FEATURE_RO_COMPAT_SUPP
))){
952 ext2_msg(sb
, KERN_ERR
, "error: couldn't mount RDWR because of "
953 "unsupported optional features (%x)",
954 le32_to_cpu(features
));
958 blocksize
= BLOCK_SIZE
<< le32_to_cpu(sbi
->s_es
->s_log_block_size
);
960 if (sbi
->s_mount_opt
& EXT2_MOUNT_DAX
) {
961 err
= bdev_dax_supported(sb
, blocksize
);
966 /* If the blocksize doesn't match, re-read the thing.. */
967 if (sb
->s_blocksize
!= blocksize
) {
970 if (!sb_set_blocksize(sb
, blocksize
)) {
971 ext2_msg(sb
, KERN_ERR
,
972 "error: bad blocksize %d", blocksize
);
976 logic_sb_block
= (sb_block
*BLOCK_SIZE
) / blocksize
;
977 offset
= (sb_block
*BLOCK_SIZE
) % blocksize
;
978 bh
= sb_bread(sb
, logic_sb_block
);
980 ext2_msg(sb
, KERN_ERR
, "error: couldn't read"
981 "superblock on 2nd try");
984 es
= (struct ext2_super_block
*) (((char *)bh
->b_data
) + offset
);
986 if (es
->s_magic
!= cpu_to_le16(EXT2_SUPER_MAGIC
)) {
987 ext2_msg(sb
, KERN_ERR
, "error: magic mismatch");
992 sb
->s_maxbytes
= ext2_max_size(sb
->s_blocksize_bits
);
993 sb
->s_max_links
= EXT2_LINK_MAX
;
995 if (le32_to_cpu(es
->s_rev_level
) == EXT2_GOOD_OLD_REV
) {
996 sbi
->s_inode_size
= EXT2_GOOD_OLD_INODE_SIZE
;
997 sbi
->s_first_ino
= EXT2_GOOD_OLD_FIRST_INO
;
999 sbi
->s_inode_size
= le16_to_cpu(es
->s_inode_size
);
1000 sbi
->s_first_ino
= le32_to_cpu(es
->s_first_ino
);
1001 if ((sbi
->s_inode_size
< EXT2_GOOD_OLD_INODE_SIZE
) ||
1002 !is_power_of_2(sbi
->s_inode_size
) ||
1003 (sbi
->s_inode_size
> blocksize
)) {
1004 ext2_msg(sb
, KERN_ERR
,
1005 "error: unsupported inode size: %d",
1011 sbi
->s_frag_size
= EXT2_MIN_FRAG_SIZE
<<
1012 le32_to_cpu(es
->s_log_frag_size
);
1013 if (sbi
->s_frag_size
== 0)
1015 sbi
->s_frags_per_block
= sb
->s_blocksize
/ sbi
->s_frag_size
;
1017 sbi
->s_blocks_per_group
= le32_to_cpu(es
->s_blocks_per_group
);
1018 sbi
->s_frags_per_group
= le32_to_cpu(es
->s_frags_per_group
);
1019 sbi
->s_inodes_per_group
= le32_to_cpu(es
->s_inodes_per_group
);
1021 if (EXT2_INODE_SIZE(sb
) == 0)
1023 sbi
->s_inodes_per_block
= sb
->s_blocksize
/ EXT2_INODE_SIZE(sb
);
1024 if (sbi
->s_inodes_per_block
== 0 || sbi
->s_inodes_per_group
== 0)
1026 sbi
->s_itb_per_group
= sbi
->s_inodes_per_group
/
1027 sbi
->s_inodes_per_block
;
1028 sbi
->s_desc_per_block
= sb
->s_blocksize
/
1029 sizeof (struct ext2_group_desc
);
1031 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
1032 sbi
->s_addr_per_block_bits
=
1033 ilog2 (EXT2_ADDR_PER_BLOCK(sb
));
1034 sbi
->s_desc_per_block_bits
=
1035 ilog2 (EXT2_DESC_PER_BLOCK(sb
));
1037 if (sb
->s_magic
!= EXT2_SUPER_MAGIC
)
1040 if (sb
->s_blocksize
!= bh
->b_size
) {
1042 ext2_msg(sb
, KERN_ERR
, "error: unsupported blocksize");
1046 if (sb
->s_blocksize
!= sbi
->s_frag_size
) {
1047 ext2_msg(sb
, KERN_ERR
,
1048 "error: fragsize %lu != blocksize %lu"
1049 "(not supported yet)",
1050 sbi
->s_frag_size
, sb
->s_blocksize
);
1054 if (sbi
->s_blocks_per_group
> sb
->s_blocksize
* 8) {
1055 ext2_msg(sb
, KERN_ERR
,
1056 "error: #blocks per group too big: %lu",
1057 sbi
->s_blocks_per_group
);
1060 if (sbi
->s_frags_per_group
> sb
->s_blocksize
* 8) {
1061 ext2_msg(sb
, KERN_ERR
,
1062 "error: #fragments per group too big: %lu",
1063 sbi
->s_frags_per_group
);
1066 if (sbi
->s_inodes_per_group
> sb
->s_blocksize
* 8) {
1067 ext2_msg(sb
, KERN_ERR
,
1068 "error: #inodes per group too big: %lu",
1069 sbi
->s_inodes_per_group
);
1073 if (EXT2_BLOCKS_PER_GROUP(sb
) == 0)
1075 sbi
->s_groups_count
= ((le32_to_cpu(es
->s_blocks_count
) -
1076 le32_to_cpu(es
->s_first_data_block
) - 1)
1077 / EXT2_BLOCKS_PER_GROUP(sb
)) + 1;
1078 db_count
= (sbi
->s_groups_count
+ EXT2_DESC_PER_BLOCK(sb
) - 1) /
1079 EXT2_DESC_PER_BLOCK(sb
);
1080 sbi
->s_group_desc
= kmalloc (db_count
* sizeof (struct buffer_head
*), GFP_KERNEL
);
1081 if (sbi
->s_group_desc
== NULL
) {
1082 ext2_msg(sb
, KERN_ERR
, "error: not enough memory");
1085 bgl_lock_init(sbi
->s_blockgroup_lock
);
1086 sbi
->s_debts
= kcalloc(sbi
->s_groups_count
, sizeof(*sbi
->s_debts
), GFP_KERNEL
);
1087 if (!sbi
->s_debts
) {
1088 ext2_msg(sb
, KERN_ERR
, "error: not enough memory");
1089 goto failed_mount_group_desc
;
1091 for (i
= 0; i
< db_count
; i
++) {
1092 block
= descriptor_loc(sb
, logic_sb_block
, i
);
1093 sbi
->s_group_desc
[i
] = sb_bread(sb
, block
);
1094 if (!sbi
->s_group_desc
[i
]) {
1095 for (j
= 0; j
< i
; j
++)
1096 brelse (sbi
->s_group_desc
[j
]);
1097 ext2_msg(sb
, KERN_ERR
,
1098 "error: unable to read group descriptors");
1099 goto failed_mount_group_desc
;
1102 if (!ext2_check_descriptors (sb
)) {
1103 ext2_msg(sb
, KERN_ERR
, "group descriptors corrupted");
1106 sbi
->s_gdb_count
= db_count
;
1107 get_random_bytes(&sbi
->s_next_generation
, sizeof(u32
));
1108 spin_lock_init(&sbi
->s_next_gen_lock
);
1110 /* per fileystem reservation list head & lock */
1111 spin_lock_init(&sbi
->s_rsv_window_lock
);
1112 sbi
->s_rsv_window_root
= RB_ROOT
;
1114 * Add a single, static dummy reservation to the start of the
1115 * reservation window list --- it gives us a placeholder for
1116 * append-at-start-of-list which makes the allocation logic
1119 sbi
->s_rsv_window_head
.rsv_start
= EXT2_RESERVE_WINDOW_NOT_ALLOCATED
;
1120 sbi
->s_rsv_window_head
.rsv_end
= EXT2_RESERVE_WINDOW_NOT_ALLOCATED
;
1121 sbi
->s_rsv_window_head
.rsv_alloc_hit
= 0;
1122 sbi
->s_rsv_window_head
.rsv_goal_size
= 0;
1123 ext2_rsv_window_add(sb
, &sbi
->s_rsv_window_head
);
1125 err
= percpu_counter_init(&sbi
->s_freeblocks_counter
,
1126 ext2_count_free_blocks(sb
), GFP_KERNEL
);
1128 err
= percpu_counter_init(&sbi
->s_freeinodes_counter
,
1129 ext2_count_free_inodes(sb
), GFP_KERNEL
);
1132 err
= percpu_counter_init(&sbi
->s_dirs_counter
,
1133 ext2_count_dirs(sb
), GFP_KERNEL
);
1136 ext2_msg(sb
, KERN_ERR
, "error: insufficient memory");
1140 #ifdef CONFIG_EXT2_FS_XATTR
1141 sbi
->s_ea_block_cache
= ext2_xattr_create_cache();
1142 if (!sbi
->s_ea_block_cache
) {
1143 ext2_msg(sb
, KERN_ERR
, "Failed to create ea_block_cache");
1148 * set up enough so that it can read an inode
1150 sb
->s_op
= &ext2_sops
;
1151 sb
->s_export_op
= &ext2_export_ops
;
1152 sb
->s_xattr
= ext2_xattr_handlers
;
1155 sb
->dq_op
= &dquot_operations
;
1156 sb
->s_qcop
= &ext2_quotactl_ops
;
1157 sb
->s_quota_types
= QTYPE_MASK_USR
| QTYPE_MASK_GRP
;
1160 root
= ext2_iget(sb
, EXT2_ROOT_INO
);
1162 ret
= PTR_ERR(root
);
1165 if (!S_ISDIR(root
->i_mode
) || !root
->i_blocks
|| !root
->i_size
) {
1167 ext2_msg(sb
, KERN_ERR
, "error: corrupt root inode, run e2fsck");
1171 sb
->s_root
= d_make_root(root
);
1173 ext2_msg(sb
, KERN_ERR
, "error: get root inode failed");
1177 if (EXT2_HAS_COMPAT_FEATURE(sb
, EXT3_FEATURE_COMPAT_HAS_JOURNAL
))
1178 ext2_msg(sb
, KERN_WARNING
,
1179 "warning: mounting ext3 filesystem as ext2");
1180 if (ext2_setup_super (sb
, es
, sb_rdonly(sb
)))
1181 sb
->s_flags
|= SB_RDONLY
;
1182 ext2_write_super(sb
);
1187 ext2_msg(sb
, KERN_ERR
,
1188 "error: can't find an ext2 filesystem on dev %s.",
1192 if (sbi
->s_ea_block_cache
)
1193 ext2_xattr_destroy_cache(sbi
->s_ea_block_cache
);
1194 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
1195 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
1196 percpu_counter_destroy(&sbi
->s_dirs_counter
);
1198 for (i
= 0; i
< db_count
; i
++)
1199 brelse(sbi
->s_group_desc
[i
]);
1200 failed_mount_group_desc
:
1201 kfree(sbi
->s_group_desc
);
1202 kfree(sbi
->s_debts
);
1206 sb
->s_fs_info
= NULL
;
1207 kfree(sbi
->s_blockgroup_lock
);
1210 fs_put_dax(dax_dev
);
1214 static void ext2_clear_super_error(struct super_block
*sb
)
1216 struct buffer_head
*sbh
= EXT2_SB(sb
)->s_sbh
;
1218 if (buffer_write_io_error(sbh
)) {
1220 * Oh, dear. A previous attempt to write the
1221 * superblock failed. This could happen because the
1222 * USB device was yanked out. Or it could happen to
1223 * be a transient write error and maybe the block will
1224 * be remapped. Nothing we can do but to retry the
1225 * write and hope for the best.
1227 ext2_msg(sb
, KERN_ERR
,
1228 "previous I/O error to superblock detected\n");
1229 clear_buffer_write_io_error(sbh
);
1230 set_buffer_uptodate(sbh
);
1234 void ext2_sync_super(struct super_block
*sb
, struct ext2_super_block
*es
,
1237 ext2_clear_super_error(sb
);
1238 spin_lock(&EXT2_SB(sb
)->s_lock
);
1239 es
->s_free_blocks_count
= cpu_to_le32(ext2_count_free_blocks(sb
));
1240 es
->s_free_inodes_count
= cpu_to_le32(ext2_count_free_inodes(sb
));
1241 es
->s_wtime
= cpu_to_le32(get_seconds());
1242 /* unlock before we do IO */
1243 spin_unlock(&EXT2_SB(sb
)->s_lock
);
1244 mark_buffer_dirty(EXT2_SB(sb
)->s_sbh
);
1246 sync_dirty_buffer(EXT2_SB(sb
)->s_sbh
);
1250 * In the second extended file system, it is not necessary to
1251 * write the super block since we use a mapping of the
1252 * disk super block in a buffer.
1254 * However, this function is still used to set the fs valid
1255 * flags to 0. We need to set this flag to 0 since the fs
1256 * may have been checked while mounted and e2fsck may have
1257 * set s_state to EXT2_VALID_FS after some corrections.
1259 static int ext2_sync_fs(struct super_block
*sb
, int wait
)
1261 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
1262 struct ext2_super_block
*es
= EXT2_SB(sb
)->s_es
;
1265 * Write quota structures to quota file, sync_blockdev() will write
1266 * them to disk later
1268 dquot_writeback_dquots(sb
, -1);
1270 spin_lock(&sbi
->s_lock
);
1271 if (es
->s_state
& cpu_to_le16(EXT2_VALID_FS
)) {
1272 ext2_debug("setting valid to 0\n");
1273 es
->s_state
&= cpu_to_le16(~EXT2_VALID_FS
);
1275 spin_unlock(&sbi
->s_lock
);
1276 ext2_sync_super(sb
, es
, wait
);
1280 static int ext2_freeze(struct super_block
*sb
)
1282 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
1285 * Open but unlinked files present? Keep EXT2_VALID_FS flag cleared
1286 * because we have unattached inodes and thus filesystem is not fully
1289 if (atomic_long_read(&sb
->s_remove_count
)) {
1290 ext2_sync_fs(sb
, 1);
1293 /* Set EXT2_FS_VALID flag */
1294 spin_lock(&sbi
->s_lock
);
1295 sbi
->s_es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
1296 spin_unlock(&sbi
->s_lock
);
1297 ext2_sync_super(sb
, sbi
->s_es
, 1);
1302 static int ext2_unfreeze(struct super_block
*sb
)
1304 /* Just write sb to clear EXT2_VALID_FS flag */
1305 ext2_write_super(sb
);
1310 static void ext2_write_super(struct super_block
*sb
)
1313 ext2_sync_fs(sb
, 1);
1316 static int ext2_remount (struct super_block
* sb
, int * flags
, char * data
)
1318 struct ext2_sb_info
* sbi
= EXT2_SB(sb
);
1319 struct ext2_super_block
* es
;
1320 struct ext2_mount_options new_opts
;
1323 sync_filesystem(sb
);
1325 spin_lock(&sbi
->s_lock
);
1326 new_opts
.s_mount_opt
= sbi
->s_mount_opt
;
1327 new_opts
.s_resuid
= sbi
->s_resuid
;
1328 new_opts
.s_resgid
= sbi
->s_resgid
;
1329 spin_unlock(&sbi
->s_lock
);
1332 * Allow the "check" option to be passed as a remount option.
1334 if (!parse_options(data
, sb
, &new_opts
))
1337 spin_lock(&sbi
->s_lock
);
1339 if ((sbi
->s_mount_opt
^ new_opts
.s_mount_opt
) & EXT2_MOUNT_DAX
) {
1340 ext2_msg(sb
, KERN_WARNING
, "warning: refusing change of "
1341 "dax flag with busy inodes while remounting");
1342 new_opts
.s_mount_opt
^= EXT2_MOUNT_DAX
;
1344 if ((bool)(*flags
& SB_RDONLY
) == sb_rdonly(sb
))
1346 if (*flags
& SB_RDONLY
) {
1347 if (le16_to_cpu(es
->s_state
) & EXT2_VALID_FS
||
1348 !(sbi
->s_mount_state
& EXT2_VALID_FS
))
1352 * OK, we are remounting a valid rw partition rdonly, so set
1353 * the rdonly flag and then mark the partition as valid again.
1355 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
1356 es
->s_mtime
= cpu_to_le32(get_seconds());
1357 spin_unlock(&sbi
->s_lock
);
1359 err
= dquot_suspend(sb
, -1);
1363 ext2_sync_super(sb
, es
, 1);
1365 __le32 ret
= EXT2_HAS_RO_COMPAT_FEATURE(sb
,
1366 ~EXT2_FEATURE_RO_COMPAT_SUPP
);
1368 spin_unlock(&sbi
->s_lock
);
1369 ext2_msg(sb
, KERN_WARNING
,
1370 "warning: couldn't remount RDWR because of "
1371 "unsupported optional features (%x).",
1376 * Mounting a RDONLY partition read-write, so reread and
1377 * store the current valid flag. (It may have been changed
1378 * by e2fsck since we originally mounted the partition.)
1380 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
1381 if (!ext2_setup_super (sb
, es
, 0))
1382 sb
->s_flags
&= ~SB_RDONLY
;
1383 spin_unlock(&sbi
->s_lock
);
1385 ext2_write_super(sb
);
1387 dquot_resume(sb
, -1);
1390 spin_lock(&sbi
->s_lock
);
1392 sbi
->s_mount_opt
= new_opts
.s_mount_opt
;
1393 sbi
->s_resuid
= new_opts
.s_resuid
;
1394 sbi
->s_resgid
= new_opts
.s_resgid
;
1395 sb
->s_flags
= (sb
->s_flags
& ~SB_POSIXACL
) |
1396 ((sbi
->s_mount_opt
& EXT2_MOUNT_POSIX_ACL
) ? SB_POSIXACL
: 0);
1397 spin_unlock(&sbi
->s_lock
);
1402 static int ext2_statfs (struct dentry
* dentry
, struct kstatfs
* buf
)
1404 struct super_block
*sb
= dentry
->d_sb
;
1405 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
1406 struct ext2_super_block
*es
= sbi
->s_es
;
1409 spin_lock(&sbi
->s_lock
);
1411 if (test_opt (sb
, MINIX_DF
))
1412 sbi
->s_overhead_last
= 0;
1413 else if (sbi
->s_blocks_last
!= le32_to_cpu(es
->s_blocks_count
)) {
1414 unsigned long i
, overhead
= 0;
1418 * Compute the overhead (FS structures). This is constant
1419 * for a given filesystem unless the number of block groups
1420 * changes so we cache the previous value until it does.
1424 * All of the blocks before first_data_block are
1427 overhead
= le32_to_cpu(es
->s_first_data_block
);
1430 * Add the overhead attributed to the superblock and
1431 * block group descriptors. If the sparse superblocks
1432 * feature is turned on, then not all groups have this.
1434 for (i
= 0; i
< sbi
->s_groups_count
; i
++)
1435 overhead
+= ext2_bg_has_super(sb
, i
) +
1436 ext2_bg_num_gdb(sb
, i
);
1439 * Every block group has an inode bitmap, a block
1440 * bitmap, and an inode table.
1442 overhead
+= (sbi
->s_groups_count
*
1443 (2 + sbi
->s_itb_per_group
));
1444 sbi
->s_overhead_last
= overhead
;
1446 sbi
->s_blocks_last
= le32_to_cpu(es
->s_blocks_count
);
1449 buf
->f_type
= EXT2_SUPER_MAGIC
;
1450 buf
->f_bsize
= sb
->s_blocksize
;
1451 buf
->f_blocks
= le32_to_cpu(es
->s_blocks_count
) - sbi
->s_overhead_last
;
1452 buf
->f_bfree
= ext2_count_free_blocks(sb
);
1453 es
->s_free_blocks_count
= cpu_to_le32(buf
->f_bfree
);
1454 buf
->f_bavail
= buf
->f_bfree
- le32_to_cpu(es
->s_r_blocks_count
);
1455 if (buf
->f_bfree
< le32_to_cpu(es
->s_r_blocks_count
))
1457 buf
->f_files
= le32_to_cpu(es
->s_inodes_count
);
1458 buf
->f_ffree
= ext2_count_free_inodes(sb
);
1459 es
->s_free_inodes_count
= cpu_to_le32(buf
->f_ffree
);
1460 buf
->f_namelen
= EXT2_NAME_LEN
;
1461 fsid
= le64_to_cpup((void *)es
->s_uuid
) ^
1462 le64_to_cpup((void *)es
->s_uuid
+ sizeof(u64
));
1463 buf
->f_fsid
.val
[0] = fsid
& 0xFFFFFFFFUL
;
1464 buf
->f_fsid
.val
[1] = (fsid
>> 32) & 0xFFFFFFFFUL
;
1465 spin_unlock(&sbi
->s_lock
);
1469 static struct dentry
*ext2_mount(struct file_system_type
*fs_type
,
1470 int flags
, const char *dev_name
, void *data
)
1472 return mount_bdev(fs_type
, flags
, dev_name
, data
, ext2_fill_super
);
1477 /* Read data from quotafile - avoid pagecache and such because we cannot afford
1478 * acquiring the locks... As quota files are never truncated and quota code
1479 * itself serializes the operations (and no one else should touch the files)
1480 * we don't have to be afraid of races */
1481 static ssize_t
ext2_quota_read(struct super_block
*sb
, int type
, char *data
,
1482 size_t len
, loff_t off
)
1484 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
1485 sector_t blk
= off
>> EXT2_BLOCK_SIZE_BITS(sb
);
1487 int offset
= off
& (sb
->s_blocksize
- 1);
1490 struct buffer_head tmp_bh
;
1491 struct buffer_head
*bh
;
1492 loff_t i_size
= i_size_read(inode
);
1496 if (off
+len
> i_size
)
1499 while (toread
> 0) {
1500 tocopy
= sb
->s_blocksize
- offset
< toread
?
1501 sb
->s_blocksize
- offset
: toread
;
1504 tmp_bh
.b_size
= sb
->s_blocksize
;
1505 err
= ext2_get_block(inode
, blk
, &tmp_bh
, 0);
1508 if (!buffer_mapped(&tmp_bh
)) /* A hole? */
1509 memset(data
, 0, tocopy
);
1511 bh
= sb_bread(sb
, tmp_bh
.b_blocknr
);
1514 memcpy(data
, bh
->b_data
+offset
, tocopy
);
1525 /* Write to quotafile */
1526 static ssize_t
ext2_quota_write(struct super_block
*sb
, int type
,
1527 const char *data
, size_t len
, loff_t off
)
1529 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
1530 sector_t blk
= off
>> EXT2_BLOCK_SIZE_BITS(sb
);
1532 int offset
= off
& (sb
->s_blocksize
- 1);
1534 size_t towrite
= len
;
1535 struct buffer_head tmp_bh
;
1536 struct buffer_head
*bh
;
1538 while (towrite
> 0) {
1539 tocopy
= sb
->s_blocksize
- offset
< towrite
?
1540 sb
->s_blocksize
- offset
: towrite
;
1543 tmp_bh
.b_size
= sb
->s_blocksize
;
1544 err
= ext2_get_block(inode
, blk
, &tmp_bh
, 1);
1547 if (offset
|| tocopy
!= EXT2_BLOCK_SIZE(sb
))
1548 bh
= sb_bread(sb
, tmp_bh
.b_blocknr
);
1550 bh
= sb_getblk(sb
, tmp_bh
.b_blocknr
);
1551 if (unlikely(!bh
)) {
1556 memcpy(bh
->b_data
+offset
, data
, tocopy
);
1557 flush_dcache_page(bh
->b_page
);
1558 set_buffer_uptodate(bh
);
1559 mark_buffer_dirty(bh
);
1570 if (inode
->i_size
< off
+len
-towrite
)
1571 i_size_write(inode
, off
+len
-towrite
);
1573 inode
->i_mtime
= inode
->i_ctime
= current_time(inode
);
1574 mark_inode_dirty(inode
);
1575 return len
- towrite
;
1578 static int ext2_quota_on(struct super_block
*sb
, int type
, int format_id
,
1579 const struct path
*path
)
1582 struct inode
*inode
;
1584 err
= dquot_quota_on(sb
, type
, format_id
, path
);
1588 inode
= d_inode(path
->dentry
);
1590 EXT2_I(inode
)->i_flags
|= EXT2_NOATIME_FL
| EXT2_IMMUTABLE_FL
;
1591 inode_set_flags(inode
, S_NOATIME
| S_IMMUTABLE
,
1592 S_NOATIME
| S_IMMUTABLE
);
1593 inode_unlock(inode
);
1594 mark_inode_dirty(inode
);
1599 static int ext2_quota_off(struct super_block
*sb
, int type
)
1601 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
1604 if (!inode
|| !igrab(inode
))
1607 err
= dquot_quota_off(sb
, type
);
1612 EXT2_I(inode
)->i_flags
&= ~(EXT2_NOATIME_FL
| EXT2_IMMUTABLE_FL
);
1613 inode_set_flags(inode
, 0, S_NOATIME
| S_IMMUTABLE
);
1614 inode_unlock(inode
);
1615 mark_inode_dirty(inode
);
1620 return dquot_quota_off(sb
, type
);
1625 static struct file_system_type ext2_fs_type
= {
1626 .owner
= THIS_MODULE
,
1628 .mount
= ext2_mount
,
1629 .kill_sb
= kill_block_super
,
1630 .fs_flags
= FS_REQUIRES_DEV
,
1632 MODULE_ALIAS_FS("ext2");
1634 static int __init
init_ext2_fs(void)
1638 err
= init_inodecache();
1641 err
= register_filesystem(&ext2_fs_type
);
1646 destroy_inodecache();
1650 static void __exit
exit_ext2_fs(void)
1652 unregister_filesystem(&ext2_fs_type
);
1653 destroy_inodecache();
1656 MODULE_AUTHOR("Remy Card and others");
1657 MODULE_DESCRIPTION("Second Extended Filesystem");
1658 MODULE_LICENSE("GPL");
1659 module_init(init_ext2_fs
)
1660 module_exit(exit_ext2_fs
)