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
);
210 init_rwsem(&ei
->dax_sem
);
212 inode_init_once(&ei
->vfs_inode
);
215 static int __init
init_inodecache(void)
217 ext2_inode_cachep
= kmem_cache_create_usercopy("ext2_inode_cache",
218 sizeof(struct ext2_inode_info
), 0,
219 (SLAB_RECLAIM_ACCOUNT
|SLAB_MEM_SPREAD
|
221 offsetof(struct ext2_inode_info
, i_data
),
222 sizeof_field(struct ext2_inode_info
, i_data
),
224 if (ext2_inode_cachep
== NULL
)
229 static void destroy_inodecache(void)
232 * Make sure all delayed rcu free inodes are flushed before we
236 kmem_cache_destroy(ext2_inode_cachep
);
239 static int ext2_show_options(struct seq_file
*seq
, struct dentry
*root
)
241 struct super_block
*sb
= root
->d_sb
;
242 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
243 struct ext2_super_block
*es
= sbi
->s_es
;
244 unsigned long def_mount_opts
;
246 spin_lock(&sbi
->s_lock
);
247 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
249 if (sbi
->s_sb_block
!= 1)
250 seq_printf(seq
, ",sb=%lu", sbi
->s_sb_block
);
251 if (test_opt(sb
, MINIX_DF
))
252 seq_puts(seq
, ",minixdf");
253 if (test_opt(sb
, GRPID
))
254 seq_puts(seq
, ",grpid");
255 if (!test_opt(sb
, GRPID
) && (def_mount_opts
& EXT2_DEFM_BSDGROUPS
))
256 seq_puts(seq
, ",nogrpid");
257 if (!uid_eq(sbi
->s_resuid
, make_kuid(&init_user_ns
, EXT2_DEF_RESUID
)) ||
258 le16_to_cpu(es
->s_def_resuid
) != EXT2_DEF_RESUID
) {
259 seq_printf(seq
, ",resuid=%u",
260 from_kuid_munged(&init_user_ns
, sbi
->s_resuid
));
262 if (!gid_eq(sbi
->s_resgid
, make_kgid(&init_user_ns
, EXT2_DEF_RESGID
)) ||
263 le16_to_cpu(es
->s_def_resgid
) != EXT2_DEF_RESGID
) {
264 seq_printf(seq
, ",resgid=%u",
265 from_kgid_munged(&init_user_ns
, sbi
->s_resgid
));
267 if (test_opt(sb
, ERRORS_RO
)) {
268 int def_errors
= le16_to_cpu(es
->s_errors
);
270 if (def_errors
== EXT2_ERRORS_PANIC
||
271 def_errors
== EXT2_ERRORS_CONTINUE
) {
272 seq_puts(seq
, ",errors=remount-ro");
275 if (test_opt(sb
, ERRORS_CONT
))
276 seq_puts(seq
, ",errors=continue");
277 if (test_opt(sb
, ERRORS_PANIC
))
278 seq_puts(seq
, ",errors=panic");
279 if (test_opt(sb
, NO_UID32
))
280 seq_puts(seq
, ",nouid32");
281 if (test_opt(sb
, DEBUG
))
282 seq_puts(seq
, ",debug");
283 if (test_opt(sb
, OLDALLOC
))
284 seq_puts(seq
, ",oldalloc");
286 #ifdef CONFIG_EXT2_FS_XATTR
287 if (test_opt(sb
, XATTR_USER
))
288 seq_puts(seq
, ",user_xattr");
289 if (!test_opt(sb
, XATTR_USER
) &&
290 (def_mount_opts
& EXT2_DEFM_XATTR_USER
)) {
291 seq_puts(seq
, ",nouser_xattr");
295 #ifdef CONFIG_EXT2_FS_POSIX_ACL
296 if (test_opt(sb
, POSIX_ACL
))
297 seq_puts(seq
, ",acl");
298 if (!test_opt(sb
, POSIX_ACL
) && (def_mount_opts
& EXT2_DEFM_ACL
))
299 seq_puts(seq
, ",noacl");
302 if (test_opt(sb
, NOBH
))
303 seq_puts(seq
, ",nobh");
305 if (test_opt(sb
, USRQUOTA
))
306 seq_puts(seq
, ",usrquota");
308 if (test_opt(sb
, GRPQUOTA
))
309 seq_puts(seq
, ",grpquota");
311 if (test_opt(sb
, XIP
))
312 seq_puts(seq
, ",xip");
314 if (test_opt(sb
, DAX
))
315 seq_puts(seq
, ",dax");
317 if (!test_opt(sb
, RESERVATION
))
318 seq_puts(seq
, ",noreservation");
320 spin_unlock(&sbi
->s_lock
);
325 static ssize_t
ext2_quota_read(struct super_block
*sb
, int type
, char *data
, size_t len
, loff_t off
);
326 static ssize_t
ext2_quota_write(struct super_block
*sb
, int type
, const char *data
, size_t len
, loff_t off
);
327 static int ext2_quota_on(struct super_block
*sb
, int type
, int format_id
,
328 const struct path
*path
);
329 static struct dquot
**ext2_get_dquots(struct inode
*inode
)
331 return EXT2_I(inode
)->i_dquot
;
334 static const struct quotactl_ops ext2_quotactl_ops
= {
335 .quota_on
= ext2_quota_on
,
336 .quota_off
= ext2_quota_off
,
337 .quota_sync
= dquot_quota_sync
,
338 .get_state
= dquot_get_state
,
339 .set_info
= dquot_set_dqinfo
,
340 .get_dqblk
= dquot_get_dqblk
,
341 .set_dqblk
= dquot_set_dqblk
,
342 .get_nextdqblk
= dquot_get_next_dqblk
,
346 static const struct super_operations ext2_sops
= {
347 .alloc_inode
= ext2_alloc_inode
,
348 .free_inode
= ext2_free_in_core_inode
,
349 .write_inode
= ext2_write_inode
,
350 .evict_inode
= ext2_evict_inode
,
351 .put_super
= ext2_put_super
,
352 .sync_fs
= ext2_sync_fs
,
353 .freeze_fs
= ext2_freeze
,
354 .unfreeze_fs
= ext2_unfreeze
,
355 .statfs
= ext2_statfs
,
356 .remount_fs
= ext2_remount
,
357 .show_options
= ext2_show_options
,
359 .quota_read
= ext2_quota_read
,
360 .quota_write
= ext2_quota_write
,
361 .get_dquots
= ext2_get_dquots
,
365 static struct inode
*ext2_nfs_get_inode(struct super_block
*sb
,
366 u64 ino
, u32 generation
)
370 if (ino
< EXT2_FIRST_INO(sb
) && ino
!= EXT2_ROOT_INO
)
371 return ERR_PTR(-ESTALE
);
372 if (ino
> le32_to_cpu(EXT2_SB(sb
)->s_es
->s_inodes_count
))
373 return ERR_PTR(-ESTALE
);
376 * ext2_iget isn't quite right if the inode is currently unallocated!
377 * However ext2_iget currently does appropriate checks to handle stale
378 * inodes so everything is OK.
380 inode
= ext2_iget(sb
, ino
);
382 return ERR_CAST(inode
);
383 if (generation
&& inode
->i_generation
!= generation
) {
384 /* we didn't find the right inode.. */
386 return ERR_PTR(-ESTALE
);
391 static struct dentry
*ext2_fh_to_dentry(struct super_block
*sb
, struct fid
*fid
,
392 int fh_len
, int fh_type
)
394 return generic_fh_to_dentry(sb
, fid
, fh_len
, fh_type
,
398 static struct dentry
*ext2_fh_to_parent(struct super_block
*sb
, struct fid
*fid
,
399 int fh_len
, int fh_type
)
401 return generic_fh_to_parent(sb
, fid
, fh_len
, fh_type
,
405 static const struct export_operations ext2_export_ops
= {
406 .fh_to_dentry
= ext2_fh_to_dentry
,
407 .fh_to_parent
= ext2_fh_to_parent
,
408 .get_parent
= ext2_get_parent
,
411 static unsigned long get_sb_block(void **data
)
413 unsigned long sb_block
;
414 char *options
= (char *) *data
;
416 if (!options
|| strncmp(options
, "sb=", 3) != 0)
417 return 1; /* Default location */
419 sb_block
= simple_strtoul(options
, &options
, 0);
420 if (*options
&& *options
!= ',') {
421 printk("EXT2-fs: Invalid sb specification: %s\n",
427 *data
= (void *) options
;
432 Opt_bsd_df
, Opt_minix_df
, Opt_grpid
, Opt_nogrpid
,
433 Opt_resgid
, Opt_resuid
, Opt_sb
, Opt_err_cont
, Opt_err_panic
,
434 Opt_err_ro
, Opt_nouid32
, Opt_nocheck
, Opt_debug
,
435 Opt_oldalloc
, Opt_orlov
, Opt_nobh
, Opt_user_xattr
, Opt_nouser_xattr
,
436 Opt_acl
, Opt_noacl
, Opt_xip
, Opt_dax
, Opt_ignore
, Opt_err
, Opt_quota
,
437 Opt_usrquota
, Opt_grpquota
, Opt_reservation
, Opt_noreservation
440 static const match_table_t tokens
= {
441 {Opt_bsd_df
, "bsddf"},
442 {Opt_minix_df
, "minixdf"},
443 {Opt_grpid
, "grpid"},
444 {Opt_grpid
, "bsdgroups"},
445 {Opt_nogrpid
, "nogrpid"},
446 {Opt_nogrpid
, "sysvgroups"},
447 {Opt_resgid
, "resgid=%u"},
448 {Opt_resuid
, "resuid=%u"},
450 {Opt_err_cont
, "errors=continue"},
451 {Opt_err_panic
, "errors=panic"},
452 {Opt_err_ro
, "errors=remount-ro"},
453 {Opt_nouid32
, "nouid32"},
454 {Opt_nocheck
, "check=none"},
455 {Opt_nocheck
, "nocheck"},
456 {Opt_debug
, "debug"},
457 {Opt_oldalloc
, "oldalloc"},
458 {Opt_orlov
, "orlov"},
460 {Opt_user_xattr
, "user_xattr"},
461 {Opt_nouser_xattr
, "nouser_xattr"},
463 {Opt_noacl
, "noacl"},
466 {Opt_grpquota
, "grpquota"},
467 {Opt_ignore
, "noquota"},
468 {Opt_quota
, "quota"},
469 {Opt_usrquota
, "usrquota"},
470 {Opt_reservation
, "reservation"},
471 {Opt_noreservation
, "noreservation"},
475 static int parse_options(char *options
, struct super_block
*sb
,
476 struct ext2_mount_options
*opts
)
479 substring_t args
[MAX_OPT_ARGS
];
487 while ((p
= strsep (&options
, ",")) != NULL
) {
492 token
= match_token(p
, tokens
, args
);
495 clear_opt (opts
->s_mount_opt
, MINIX_DF
);
498 set_opt (opts
->s_mount_opt
, MINIX_DF
);
501 set_opt (opts
->s_mount_opt
, GRPID
);
504 clear_opt (opts
->s_mount_opt
, GRPID
);
507 if (match_int(&args
[0], &option
))
509 uid
= make_kuid(current_user_ns(), option
);
510 if (!uid_valid(uid
)) {
511 ext2_msg(sb
, KERN_ERR
, "Invalid uid value %d", option
);
515 opts
->s_resuid
= uid
;
518 if (match_int(&args
[0], &option
))
520 gid
= make_kgid(current_user_ns(), option
);
521 if (!gid_valid(gid
)) {
522 ext2_msg(sb
, KERN_ERR
, "Invalid gid value %d", option
);
525 opts
->s_resgid
= gid
;
528 /* handled by get_sb_block() instead of here */
529 /* *sb_block = match_int(&args[0]); */
532 clear_opt (opts
->s_mount_opt
, ERRORS_CONT
);
533 clear_opt (opts
->s_mount_opt
, ERRORS_RO
);
534 set_opt (opts
->s_mount_opt
, ERRORS_PANIC
);
537 clear_opt (opts
->s_mount_opt
, ERRORS_CONT
);
538 clear_opt (opts
->s_mount_opt
, ERRORS_PANIC
);
539 set_opt (opts
->s_mount_opt
, ERRORS_RO
);
542 clear_opt (opts
->s_mount_opt
, ERRORS_RO
);
543 clear_opt (opts
->s_mount_opt
, ERRORS_PANIC
);
544 set_opt (opts
->s_mount_opt
, ERRORS_CONT
);
547 set_opt (opts
->s_mount_opt
, NO_UID32
);
550 ext2_msg(sb
, KERN_WARNING
,
551 "Option nocheck/check=none is deprecated and"
552 " will be removed in June 2020.");
553 clear_opt (opts
->s_mount_opt
, CHECK
);
556 set_opt (opts
->s_mount_opt
, DEBUG
);
559 set_opt (opts
->s_mount_opt
, OLDALLOC
);
562 clear_opt (opts
->s_mount_opt
, OLDALLOC
);
565 set_opt (opts
->s_mount_opt
, NOBH
);
567 #ifdef CONFIG_EXT2_FS_XATTR
569 set_opt (opts
->s_mount_opt
, XATTR_USER
);
571 case Opt_nouser_xattr
:
572 clear_opt (opts
->s_mount_opt
, XATTR_USER
);
576 case Opt_nouser_xattr
:
577 ext2_msg(sb
, KERN_INFO
, "(no)user_xattr options"
581 #ifdef CONFIG_EXT2_FS_POSIX_ACL
583 set_opt(opts
->s_mount_opt
, POSIX_ACL
);
586 clear_opt(opts
->s_mount_opt
, POSIX_ACL
);
591 ext2_msg(sb
, KERN_INFO
,
592 "(no)acl options not supported");
596 ext2_msg(sb
, KERN_INFO
, "use dax instead of xip");
597 set_opt(opts
->s_mount_opt
, XIP
);
601 ext2_msg(sb
, KERN_WARNING
,
602 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
603 set_opt(opts
->s_mount_opt
, DAX
);
605 ext2_msg(sb
, KERN_INFO
, "dax option not supported");
609 #if defined(CONFIG_QUOTA)
612 set_opt(opts
->s_mount_opt
, USRQUOTA
);
616 set_opt(opts
->s_mount_opt
, GRPQUOTA
);
622 ext2_msg(sb
, KERN_INFO
,
623 "quota operations not supported");
627 case Opt_reservation
:
628 set_opt(opts
->s_mount_opt
, RESERVATION
);
629 ext2_msg(sb
, KERN_INFO
, "reservations ON");
631 case Opt_noreservation
:
632 clear_opt(opts
->s_mount_opt
, RESERVATION
);
633 ext2_msg(sb
, KERN_INFO
, "reservations OFF");
644 static int ext2_setup_super (struct super_block
* sb
,
645 struct ext2_super_block
* es
,
649 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
651 if (le32_to_cpu(es
->s_rev_level
) > EXT2_MAX_SUPP_REV
) {
652 ext2_msg(sb
, KERN_ERR
,
653 "error: revision level too high, "
654 "forcing read-only mode");
659 if (!(sbi
->s_mount_state
& EXT2_VALID_FS
))
660 ext2_msg(sb
, KERN_WARNING
,
661 "warning: mounting unchecked fs, "
662 "running e2fsck is recommended");
663 else if ((sbi
->s_mount_state
& EXT2_ERROR_FS
))
664 ext2_msg(sb
, KERN_WARNING
,
665 "warning: mounting fs with errors, "
666 "running e2fsck is recommended");
667 else if ((__s16
) le16_to_cpu(es
->s_max_mnt_count
) >= 0 &&
668 le16_to_cpu(es
->s_mnt_count
) >=
669 (unsigned short) (__s16
) le16_to_cpu(es
->s_max_mnt_count
))
670 ext2_msg(sb
, KERN_WARNING
,
671 "warning: maximal mount count reached, "
672 "running e2fsck is recommended");
673 else if (le32_to_cpu(es
->s_checkinterval
) &&
674 (le32_to_cpu(es
->s_lastcheck
) +
675 le32_to_cpu(es
->s_checkinterval
) <=
676 ktime_get_real_seconds()))
677 ext2_msg(sb
, KERN_WARNING
,
678 "warning: checktime reached, "
679 "running e2fsck is recommended");
680 if (!le16_to_cpu(es
->s_max_mnt_count
))
681 es
->s_max_mnt_count
= cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT
);
682 le16_add_cpu(&es
->s_mnt_count
, 1);
683 if (test_opt (sb
, DEBUG
))
684 ext2_msg(sb
, KERN_INFO
, "%s, %s, bs=%lu, fs=%lu, gc=%lu, "
685 "bpg=%lu, ipg=%lu, mo=%04lx]",
686 EXT2FS_VERSION
, EXT2FS_DATE
, sb
->s_blocksize
,
689 EXT2_BLOCKS_PER_GROUP(sb
),
690 EXT2_INODES_PER_GROUP(sb
),
695 static int ext2_check_descriptors(struct super_block
*sb
)
698 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
700 ext2_debug ("Checking group descriptors");
702 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
703 struct ext2_group_desc
*gdp
= ext2_get_group_desc(sb
, i
, NULL
);
704 ext2_fsblk_t first_block
= ext2_group_first_block_no(sb
, i
);
705 ext2_fsblk_t last_block
;
707 if (i
== sbi
->s_groups_count
- 1)
708 last_block
= le32_to_cpu(sbi
->s_es
->s_blocks_count
) - 1;
710 last_block
= first_block
+
711 (EXT2_BLOCKS_PER_GROUP(sb
) - 1);
713 if (le32_to_cpu(gdp
->bg_block_bitmap
) < first_block
||
714 le32_to_cpu(gdp
->bg_block_bitmap
) > last_block
)
716 ext2_error (sb
, "ext2_check_descriptors",
717 "Block bitmap for group %d"
718 " not in group (block %lu)!",
719 i
, (unsigned long) le32_to_cpu(gdp
->bg_block_bitmap
));
722 if (le32_to_cpu(gdp
->bg_inode_bitmap
) < first_block
||
723 le32_to_cpu(gdp
->bg_inode_bitmap
) > last_block
)
725 ext2_error (sb
, "ext2_check_descriptors",
726 "Inode bitmap for group %d"
727 " not in group (block %lu)!",
728 i
, (unsigned long) le32_to_cpu(gdp
->bg_inode_bitmap
));
731 if (le32_to_cpu(gdp
->bg_inode_table
) < first_block
||
732 le32_to_cpu(gdp
->bg_inode_table
) + sbi
->s_itb_per_group
- 1 >
735 ext2_error (sb
, "ext2_check_descriptors",
736 "Inode table for group %d"
737 " not in group (block %lu)!",
738 i
, (unsigned long) le32_to_cpu(gdp
->bg_inode_table
));
746 * Maximal file size. There is a direct, and {,double-,triple-}indirect
747 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
748 * We need to be 1 filesystem block less than the 2^32 sector limit.
750 static loff_t
ext2_max_size(int bits
)
752 loff_t res
= EXT2_NDIR_BLOCKS
;
754 unsigned int upper_limit
;
755 unsigned int ppb
= 1 << (bits
-2);
757 /* This is calculated to be the largest file size for a
758 * dense, file such that the total number of
759 * sectors in the file, including data and all indirect blocks,
760 * does not exceed 2^32 -1
761 * __u32 i_blocks representing the total number of
762 * 512 bytes blocks of the file
764 upper_limit
= (1LL << 32) - 1;
766 /* total blocks in file system block size */
767 upper_limit
>>= (bits
- 9);
769 /* Compute how many blocks we can address by block tree */
770 res
+= 1LL << (bits
-2);
771 res
+= 1LL << (2*(bits
-2));
772 res
+= 1LL << (3*(bits
-2));
773 /* Compute how many metadata blocks are needed */
775 meta_blocks
+= 1 + ppb
;
776 meta_blocks
+= 1 + ppb
+ ppb
* ppb
;
777 /* Does block tree limit file size? */
778 if (res
+ meta_blocks
<= upper_limit
)
782 /* How many metadata blocks are needed for addressing upper_limit? */
783 upper_limit
-= EXT2_NDIR_BLOCKS
;
784 /* indirect blocks */
787 /* double indirect blocks */
788 if (upper_limit
< ppb
* ppb
) {
789 meta_blocks
+= 1 + DIV_ROUND_UP(upper_limit
, ppb
);
793 meta_blocks
+= 1 + ppb
;
794 upper_limit
-= ppb
* ppb
;
795 /* tripple indirect blocks for the rest */
796 meta_blocks
+= 1 + DIV_ROUND_UP(upper_limit
, ppb
) +
797 DIV_ROUND_UP(upper_limit
, ppb
*ppb
);
801 if (res
> MAX_LFS_FILESIZE
)
802 res
= MAX_LFS_FILESIZE
;
807 static unsigned long descriptor_loc(struct super_block
*sb
,
808 unsigned long logic_sb_block
,
811 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
812 unsigned long bg
, first_meta_bg
;
815 first_meta_bg
= le32_to_cpu(sbi
->s_es
->s_first_meta_bg
);
817 if (!EXT2_HAS_INCOMPAT_FEATURE(sb
, EXT2_FEATURE_INCOMPAT_META_BG
) ||
819 return (logic_sb_block
+ nr
+ 1);
820 bg
= sbi
->s_desc_per_block
* nr
;
821 if (ext2_bg_has_super(sb
, bg
))
824 return ext2_group_first_block_no(sb
, bg
) + has_super
;
827 static int ext2_fill_super(struct super_block
*sb
, void *data
, int silent
)
829 struct dax_device
*dax_dev
= fs_dax_get_by_bdev(sb
->s_bdev
);
830 struct buffer_head
* bh
;
831 struct ext2_sb_info
* sbi
;
832 struct ext2_super_block
* es
;
835 unsigned long sb_block
= get_sb_block(&data
);
836 unsigned long logic_sb_block
;
837 unsigned long offset
= 0;
838 unsigned long def_mount_opts
;
840 int blocksize
= BLOCK_SIZE
;
845 struct ext2_mount_options opts
;
847 sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
851 sbi
->s_blockgroup_lock
=
852 kzalloc(sizeof(struct blockgroup_lock
), GFP_KERNEL
);
853 if (!sbi
->s_blockgroup_lock
) {
858 sbi
->s_sb_block
= sb_block
;
859 sbi
->s_daxdev
= dax_dev
;
861 spin_lock_init(&sbi
->s_lock
);
865 * See what the current blocksize for the device is, and
866 * use that as the blocksize. Otherwise (or if the blocksize
867 * is smaller than the default) use the default.
868 * This is important for devices that have a hardware
869 * sectorsize that is larger than the default.
871 blocksize
= sb_min_blocksize(sb
, BLOCK_SIZE
);
873 ext2_msg(sb
, KERN_ERR
, "error: unable to set blocksize");
878 * If the superblock doesn't start on a hardware sector boundary,
879 * calculate the offset.
881 if (blocksize
!= BLOCK_SIZE
) {
882 logic_sb_block
= (sb_block
*BLOCK_SIZE
) / blocksize
;
883 offset
= (sb_block
*BLOCK_SIZE
) % blocksize
;
885 logic_sb_block
= sb_block
;
888 if (!(bh
= sb_bread(sb
, logic_sb_block
))) {
889 ext2_msg(sb
, KERN_ERR
, "error: unable to read superblock");
893 * Note: s_es must be initialized as soon as possible because
894 * some ext2 macro-instructions depend on its value
896 es
= (struct ext2_super_block
*) (((char *)bh
->b_data
) + offset
);
898 sb
->s_magic
= le16_to_cpu(es
->s_magic
);
900 if (sb
->s_magic
!= EXT2_SUPER_MAGIC
)
903 opts
.s_mount_opt
= 0;
904 /* Set defaults before we parse the mount options */
905 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
906 if (def_mount_opts
& EXT2_DEFM_DEBUG
)
907 set_opt(opts
.s_mount_opt
, DEBUG
);
908 if (def_mount_opts
& EXT2_DEFM_BSDGROUPS
)
909 set_opt(opts
.s_mount_opt
, GRPID
);
910 if (def_mount_opts
& EXT2_DEFM_UID16
)
911 set_opt(opts
.s_mount_opt
, NO_UID32
);
912 #ifdef CONFIG_EXT2_FS_XATTR
913 if (def_mount_opts
& EXT2_DEFM_XATTR_USER
)
914 set_opt(opts
.s_mount_opt
, XATTR_USER
);
916 #ifdef CONFIG_EXT2_FS_POSIX_ACL
917 if (def_mount_opts
& EXT2_DEFM_ACL
)
918 set_opt(opts
.s_mount_opt
, POSIX_ACL
);
921 if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT2_ERRORS_PANIC
)
922 set_opt(opts
.s_mount_opt
, ERRORS_PANIC
);
923 else if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT2_ERRORS_CONTINUE
)
924 set_opt(opts
.s_mount_opt
, ERRORS_CONT
);
926 set_opt(opts
.s_mount_opt
, ERRORS_RO
);
928 opts
.s_resuid
= make_kuid(&init_user_ns
, le16_to_cpu(es
->s_def_resuid
));
929 opts
.s_resgid
= make_kgid(&init_user_ns
, le16_to_cpu(es
->s_def_resgid
));
931 set_opt(opts
.s_mount_opt
, RESERVATION
);
933 if (!parse_options((char *) data
, sb
, &opts
))
936 sbi
->s_mount_opt
= opts
.s_mount_opt
;
937 sbi
->s_resuid
= opts
.s_resuid
;
938 sbi
->s_resgid
= opts
.s_resgid
;
940 sb
->s_flags
= (sb
->s_flags
& ~SB_POSIXACL
) |
941 (test_opt(sb
, POSIX_ACL
) ? SB_POSIXACL
: 0);
942 sb
->s_iflags
|= SB_I_CGROUPWB
;
944 if (le32_to_cpu(es
->s_rev_level
) == EXT2_GOOD_OLD_REV
&&
945 (EXT2_HAS_COMPAT_FEATURE(sb
, ~0U) ||
946 EXT2_HAS_RO_COMPAT_FEATURE(sb
, ~0U) ||
947 EXT2_HAS_INCOMPAT_FEATURE(sb
, ~0U)))
948 ext2_msg(sb
, KERN_WARNING
,
949 "warning: feature flags set on rev 0 fs, "
950 "running e2fsck is recommended");
952 * Check feature flags regardless of the revision level, since we
953 * previously didn't change the revision level when setting the flags,
954 * so there is a chance incompat flags are set on a rev 0 filesystem.
956 features
= EXT2_HAS_INCOMPAT_FEATURE(sb
, ~EXT2_FEATURE_INCOMPAT_SUPP
);
958 ext2_msg(sb
, KERN_ERR
, "error: couldn't mount because of "
959 "unsupported optional features (%x)",
960 le32_to_cpu(features
));
963 if (!sb_rdonly(sb
) && (features
= EXT2_HAS_RO_COMPAT_FEATURE(sb
, ~EXT2_FEATURE_RO_COMPAT_SUPP
))){
964 ext2_msg(sb
, KERN_ERR
, "error: couldn't mount RDWR because of "
965 "unsupported optional features (%x)",
966 le32_to_cpu(features
));
970 blocksize
= BLOCK_SIZE
<< le32_to_cpu(sbi
->s_es
->s_log_block_size
);
972 if (test_opt(sb
, DAX
)) {
973 if (!bdev_dax_supported(sb
->s_bdev
, blocksize
)) {
974 ext2_msg(sb
, KERN_ERR
,
975 "DAX unsupported by block device. Turning off DAX.");
976 clear_opt(sbi
->s_mount_opt
, DAX
);
980 /* If the blocksize doesn't match, re-read the thing.. */
981 if (sb
->s_blocksize
!= blocksize
) {
984 if (!sb_set_blocksize(sb
, blocksize
)) {
985 ext2_msg(sb
, KERN_ERR
,
986 "error: bad blocksize %d", blocksize
);
990 logic_sb_block
= (sb_block
*BLOCK_SIZE
) / blocksize
;
991 offset
= (sb_block
*BLOCK_SIZE
) % blocksize
;
992 bh
= sb_bread(sb
, logic_sb_block
);
994 ext2_msg(sb
, KERN_ERR
, "error: couldn't read"
995 "superblock on 2nd try");
998 es
= (struct ext2_super_block
*) (((char *)bh
->b_data
) + offset
);
1000 if (es
->s_magic
!= cpu_to_le16(EXT2_SUPER_MAGIC
)) {
1001 ext2_msg(sb
, KERN_ERR
, "error: magic mismatch");
1006 sb
->s_maxbytes
= ext2_max_size(sb
->s_blocksize_bits
);
1007 sb
->s_max_links
= EXT2_LINK_MAX
;
1008 sb
->s_time_min
= S32_MIN
;
1009 sb
->s_time_max
= S32_MAX
;
1011 if (le32_to_cpu(es
->s_rev_level
) == EXT2_GOOD_OLD_REV
) {
1012 sbi
->s_inode_size
= EXT2_GOOD_OLD_INODE_SIZE
;
1013 sbi
->s_first_ino
= EXT2_GOOD_OLD_FIRST_INO
;
1015 sbi
->s_inode_size
= le16_to_cpu(es
->s_inode_size
);
1016 sbi
->s_first_ino
= le32_to_cpu(es
->s_first_ino
);
1017 if ((sbi
->s_inode_size
< EXT2_GOOD_OLD_INODE_SIZE
) ||
1018 !is_power_of_2(sbi
->s_inode_size
) ||
1019 (sbi
->s_inode_size
> blocksize
)) {
1020 ext2_msg(sb
, KERN_ERR
,
1021 "error: unsupported inode size: %d",
1027 sbi
->s_frag_size
= EXT2_MIN_FRAG_SIZE
<<
1028 le32_to_cpu(es
->s_log_frag_size
);
1029 if (sbi
->s_frag_size
== 0)
1031 sbi
->s_frags_per_block
= sb
->s_blocksize
/ sbi
->s_frag_size
;
1033 sbi
->s_blocks_per_group
= le32_to_cpu(es
->s_blocks_per_group
);
1034 sbi
->s_frags_per_group
= le32_to_cpu(es
->s_frags_per_group
);
1035 sbi
->s_inodes_per_group
= le32_to_cpu(es
->s_inodes_per_group
);
1037 sbi
->s_inodes_per_block
= sb
->s_blocksize
/ EXT2_INODE_SIZE(sb
);
1038 if (sbi
->s_inodes_per_block
== 0 || sbi
->s_inodes_per_group
== 0)
1040 sbi
->s_itb_per_group
= sbi
->s_inodes_per_group
/
1041 sbi
->s_inodes_per_block
;
1042 sbi
->s_desc_per_block
= sb
->s_blocksize
/
1043 sizeof (struct ext2_group_desc
);
1045 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
1046 sbi
->s_addr_per_block_bits
=
1047 ilog2 (EXT2_ADDR_PER_BLOCK(sb
));
1048 sbi
->s_desc_per_block_bits
=
1049 ilog2 (EXT2_DESC_PER_BLOCK(sb
));
1051 if (sb
->s_magic
!= EXT2_SUPER_MAGIC
)
1054 if (sb
->s_blocksize
!= bh
->b_size
) {
1056 ext2_msg(sb
, KERN_ERR
, "error: unsupported blocksize");
1060 if (sb
->s_blocksize
!= sbi
->s_frag_size
) {
1061 ext2_msg(sb
, KERN_ERR
,
1062 "error: fragsize %lu != blocksize %lu"
1063 "(not supported yet)",
1064 sbi
->s_frag_size
, sb
->s_blocksize
);
1068 if (sbi
->s_blocks_per_group
> sb
->s_blocksize
* 8) {
1069 ext2_msg(sb
, KERN_ERR
,
1070 "error: #blocks per group too big: %lu",
1071 sbi
->s_blocks_per_group
);
1074 if (sbi
->s_frags_per_group
> sb
->s_blocksize
* 8) {
1075 ext2_msg(sb
, KERN_ERR
,
1076 "error: #fragments per group too big: %lu",
1077 sbi
->s_frags_per_group
);
1080 if (sbi
->s_inodes_per_group
> sb
->s_blocksize
* 8) {
1081 ext2_msg(sb
, KERN_ERR
,
1082 "error: #inodes per group too big: %lu",
1083 sbi
->s_inodes_per_group
);
1087 if (EXT2_BLOCKS_PER_GROUP(sb
) == 0)
1089 sbi
->s_groups_count
= ((le32_to_cpu(es
->s_blocks_count
) -
1090 le32_to_cpu(es
->s_first_data_block
) - 1)
1091 / EXT2_BLOCKS_PER_GROUP(sb
)) + 1;
1092 db_count
= (sbi
->s_groups_count
+ EXT2_DESC_PER_BLOCK(sb
) - 1) /
1093 EXT2_DESC_PER_BLOCK(sb
);
1094 sbi
->s_group_desc
= kmalloc_array (db_count
,
1095 sizeof(struct buffer_head
*),
1097 if (sbi
->s_group_desc
== NULL
) {
1099 ext2_msg(sb
, KERN_ERR
, "error: not enough memory");
1102 bgl_lock_init(sbi
->s_blockgroup_lock
);
1103 sbi
->s_debts
= kcalloc(sbi
->s_groups_count
, sizeof(*sbi
->s_debts
), GFP_KERNEL
);
1104 if (!sbi
->s_debts
) {
1106 ext2_msg(sb
, KERN_ERR
, "error: not enough memory");
1107 goto failed_mount_group_desc
;
1109 for (i
= 0; i
< db_count
; i
++) {
1110 block
= descriptor_loc(sb
, logic_sb_block
, i
);
1111 sbi
->s_group_desc
[i
] = sb_bread(sb
, block
);
1112 if (!sbi
->s_group_desc
[i
]) {
1113 for (j
= 0; j
< i
; j
++)
1114 brelse (sbi
->s_group_desc
[j
]);
1115 ext2_msg(sb
, KERN_ERR
,
1116 "error: unable to read group descriptors");
1117 goto failed_mount_group_desc
;
1120 if (!ext2_check_descriptors (sb
)) {
1121 ext2_msg(sb
, KERN_ERR
, "group descriptors corrupted");
1124 sbi
->s_gdb_count
= db_count
;
1125 get_random_bytes(&sbi
->s_next_generation
, sizeof(u32
));
1126 spin_lock_init(&sbi
->s_next_gen_lock
);
1128 /* per fileystem reservation list head & lock */
1129 spin_lock_init(&sbi
->s_rsv_window_lock
);
1130 sbi
->s_rsv_window_root
= RB_ROOT
;
1132 * Add a single, static dummy reservation to the start of the
1133 * reservation window list --- it gives us a placeholder for
1134 * append-at-start-of-list which makes the allocation logic
1137 sbi
->s_rsv_window_head
.rsv_start
= EXT2_RESERVE_WINDOW_NOT_ALLOCATED
;
1138 sbi
->s_rsv_window_head
.rsv_end
= EXT2_RESERVE_WINDOW_NOT_ALLOCATED
;
1139 sbi
->s_rsv_window_head
.rsv_alloc_hit
= 0;
1140 sbi
->s_rsv_window_head
.rsv_goal_size
= 0;
1141 ext2_rsv_window_add(sb
, &sbi
->s_rsv_window_head
);
1143 err
= percpu_counter_init(&sbi
->s_freeblocks_counter
,
1144 ext2_count_free_blocks(sb
), GFP_KERNEL
);
1146 err
= percpu_counter_init(&sbi
->s_freeinodes_counter
,
1147 ext2_count_free_inodes(sb
), GFP_KERNEL
);
1150 err
= percpu_counter_init(&sbi
->s_dirs_counter
,
1151 ext2_count_dirs(sb
), GFP_KERNEL
);
1154 ext2_msg(sb
, KERN_ERR
, "error: insufficient memory");
1158 #ifdef CONFIG_EXT2_FS_XATTR
1159 sbi
->s_ea_block_cache
= ext2_xattr_create_cache();
1160 if (!sbi
->s_ea_block_cache
) {
1162 ext2_msg(sb
, KERN_ERR
, "Failed to create ea_block_cache");
1167 * set up enough so that it can read an inode
1169 sb
->s_op
= &ext2_sops
;
1170 sb
->s_export_op
= &ext2_export_ops
;
1171 sb
->s_xattr
= ext2_xattr_handlers
;
1174 sb
->dq_op
= &dquot_operations
;
1175 sb
->s_qcop
= &ext2_quotactl_ops
;
1176 sb
->s_quota_types
= QTYPE_MASK_USR
| QTYPE_MASK_GRP
;
1179 root
= ext2_iget(sb
, EXT2_ROOT_INO
);
1181 ret
= PTR_ERR(root
);
1184 if (!S_ISDIR(root
->i_mode
) || !root
->i_blocks
|| !root
->i_size
) {
1186 ext2_msg(sb
, KERN_ERR
, "error: corrupt root inode, run e2fsck");
1190 sb
->s_root
= d_make_root(root
);
1192 ext2_msg(sb
, KERN_ERR
, "error: get root inode failed");
1196 if (EXT2_HAS_COMPAT_FEATURE(sb
, EXT3_FEATURE_COMPAT_HAS_JOURNAL
))
1197 ext2_msg(sb
, KERN_WARNING
,
1198 "warning: mounting ext3 filesystem as ext2");
1199 if (ext2_setup_super (sb
, es
, sb_rdonly(sb
)))
1200 sb
->s_flags
|= SB_RDONLY
;
1201 ext2_write_super(sb
);
1206 ext2_msg(sb
, KERN_ERR
,
1207 "error: can't find an ext2 filesystem on dev %s.",
1211 ext2_xattr_destroy_cache(sbi
->s_ea_block_cache
);
1212 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
1213 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
1214 percpu_counter_destroy(&sbi
->s_dirs_counter
);
1216 for (i
= 0; i
< db_count
; i
++)
1217 brelse(sbi
->s_group_desc
[i
]);
1218 failed_mount_group_desc
:
1219 kfree(sbi
->s_group_desc
);
1220 kfree(sbi
->s_debts
);
1224 sb
->s_fs_info
= NULL
;
1225 kfree(sbi
->s_blockgroup_lock
);
1228 fs_put_dax(dax_dev
);
1232 static void ext2_clear_super_error(struct super_block
*sb
)
1234 struct buffer_head
*sbh
= EXT2_SB(sb
)->s_sbh
;
1236 if (buffer_write_io_error(sbh
)) {
1238 * Oh, dear. A previous attempt to write the
1239 * superblock failed. This could happen because the
1240 * USB device was yanked out. Or it could happen to
1241 * be a transient write error and maybe the block will
1242 * be remapped. Nothing we can do but to retry the
1243 * write and hope for the best.
1245 ext2_msg(sb
, KERN_ERR
,
1246 "previous I/O error to superblock detected");
1247 clear_buffer_write_io_error(sbh
);
1248 set_buffer_uptodate(sbh
);
1252 void ext2_sync_super(struct super_block
*sb
, struct ext2_super_block
*es
,
1255 ext2_clear_super_error(sb
);
1256 spin_lock(&EXT2_SB(sb
)->s_lock
);
1257 es
->s_free_blocks_count
= cpu_to_le32(ext2_count_free_blocks(sb
));
1258 es
->s_free_inodes_count
= cpu_to_le32(ext2_count_free_inodes(sb
));
1259 es
->s_wtime
= cpu_to_le32(ktime_get_real_seconds());
1260 /* unlock before we do IO */
1261 spin_unlock(&EXT2_SB(sb
)->s_lock
);
1262 mark_buffer_dirty(EXT2_SB(sb
)->s_sbh
);
1264 sync_dirty_buffer(EXT2_SB(sb
)->s_sbh
);
1268 * In the second extended file system, it is not necessary to
1269 * write the super block since we use a mapping of the
1270 * disk super block in a buffer.
1272 * However, this function is still used to set the fs valid
1273 * flags to 0. We need to set this flag to 0 since the fs
1274 * may have been checked while mounted and e2fsck may have
1275 * set s_state to EXT2_VALID_FS after some corrections.
1277 static int ext2_sync_fs(struct super_block
*sb
, int wait
)
1279 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
1280 struct ext2_super_block
*es
= EXT2_SB(sb
)->s_es
;
1283 * Write quota structures to quota file, sync_blockdev() will write
1284 * them to disk later
1286 dquot_writeback_dquots(sb
, -1);
1288 spin_lock(&sbi
->s_lock
);
1289 if (es
->s_state
& cpu_to_le16(EXT2_VALID_FS
)) {
1290 ext2_debug("setting valid to 0\n");
1291 es
->s_state
&= cpu_to_le16(~EXT2_VALID_FS
);
1293 spin_unlock(&sbi
->s_lock
);
1294 ext2_sync_super(sb
, es
, wait
);
1298 static int ext2_freeze(struct super_block
*sb
)
1300 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
1303 * Open but unlinked files present? Keep EXT2_VALID_FS flag cleared
1304 * because we have unattached inodes and thus filesystem is not fully
1307 if (atomic_long_read(&sb
->s_remove_count
)) {
1308 ext2_sync_fs(sb
, 1);
1311 /* Set EXT2_FS_VALID flag */
1312 spin_lock(&sbi
->s_lock
);
1313 sbi
->s_es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
1314 spin_unlock(&sbi
->s_lock
);
1315 ext2_sync_super(sb
, sbi
->s_es
, 1);
1320 static int ext2_unfreeze(struct super_block
*sb
)
1322 /* Just write sb to clear EXT2_VALID_FS flag */
1323 ext2_write_super(sb
);
1328 static void ext2_write_super(struct super_block
*sb
)
1331 ext2_sync_fs(sb
, 1);
1334 static int ext2_remount (struct super_block
* sb
, int * flags
, char * data
)
1336 struct ext2_sb_info
* sbi
= EXT2_SB(sb
);
1337 struct ext2_super_block
* es
;
1338 struct ext2_mount_options new_opts
;
1341 sync_filesystem(sb
);
1343 spin_lock(&sbi
->s_lock
);
1344 new_opts
.s_mount_opt
= sbi
->s_mount_opt
;
1345 new_opts
.s_resuid
= sbi
->s_resuid
;
1346 new_opts
.s_resgid
= sbi
->s_resgid
;
1347 spin_unlock(&sbi
->s_lock
);
1349 if (!parse_options(data
, sb
, &new_opts
))
1352 spin_lock(&sbi
->s_lock
);
1354 if ((sbi
->s_mount_opt
^ new_opts
.s_mount_opt
) & EXT2_MOUNT_DAX
) {
1355 ext2_msg(sb
, KERN_WARNING
, "warning: refusing change of "
1356 "dax flag with busy inodes while remounting");
1357 new_opts
.s_mount_opt
^= EXT2_MOUNT_DAX
;
1359 if ((bool)(*flags
& SB_RDONLY
) == sb_rdonly(sb
))
1361 if (*flags
& SB_RDONLY
) {
1362 if (le16_to_cpu(es
->s_state
) & EXT2_VALID_FS
||
1363 !(sbi
->s_mount_state
& EXT2_VALID_FS
))
1367 * OK, we are remounting a valid rw partition rdonly, so set
1368 * the rdonly flag and then mark the partition as valid again.
1370 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
1371 es
->s_mtime
= cpu_to_le32(ktime_get_real_seconds());
1372 spin_unlock(&sbi
->s_lock
);
1374 err
= dquot_suspend(sb
, -1);
1378 ext2_sync_super(sb
, es
, 1);
1380 __le32 ret
= EXT2_HAS_RO_COMPAT_FEATURE(sb
,
1381 ~EXT2_FEATURE_RO_COMPAT_SUPP
);
1383 spin_unlock(&sbi
->s_lock
);
1384 ext2_msg(sb
, KERN_WARNING
,
1385 "warning: couldn't remount RDWR because of "
1386 "unsupported optional features (%x).",
1391 * Mounting a RDONLY partition read-write, so reread and
1392 * store the current valid flag. (It may have been changed
1393 * by e2fsck since we originally mounted the partition.)
1395 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
1396 if (!ext2_setup_super (sb
, es
, 0))
1397 sb
->s_flags
&= ~SB_RDONLY
;
1398 spin_unlock(&sbi
->s_lock
);
1400 ext2_write_super(sb
);
1402 dquot_resume(sb
, -1);
1405 spin_lock(&sbi
->s_lock
);
1407 sbi
->s_mount_opt
= new_opts
.s_mount_opt
;
1408 sbi
->s_resuid
= new_opts
.s_resuid
;
1409 sbi
->s_resgid
= new_opts
.s_resgid
;
1410 sb
->s_flags
= (sb
->s_flags
& ~SB_POSIXACL
) |
1411 (test_opt(sb
, POSIX_ACL
) ? SB_POSIXACL
: 0);
1412 spin_unlock(&sbi
->s_lock
);
1417 static int ext2_statfs (struct dentry
* dentry
, struct kstatfs
* buf
)
1419 struct super_block
*sb
= dentry
->d_sb
;
1420 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
1421 struct ext2_super_block
*es
= sbi
->s_es
;
1424 spin_lock(&sbi
->s_lock
);
1426 if (test_opt (sb
, MINIX_DF
))
1427 sbi
->s_overhead_last
= 0;
1428 else if (sbi
->s_blocks_last
!= le32_to_cpu(es
->s_blocks_count
)) {
1429 unsigned long i
, overhead
= 0;
1433 * Compute the overhead (FS structures). This is constant
1434 * for a given filesystem unless the number of block groups
1435 * changes so we cache the previous value until it does.
1439 * All of the blocks before first_data_block are
1442 overhead
= le32_to_cpu(es
->s_first_data_block
);
1445 * Add the overhead attributed to the superblock and
1446 * block group descriptors. If the sparse superblocks
1447 * feature is turned on, then not all groups have this.
1449 for (i
= 0; i
< sbi
->s_groups_count
; i
++)
1450 overhead
+= ext2_bg_has_super(sb
, i
) +
1451 ext2_bg_num_gdb(sb
, i
);
1454 * Every block group has an inode bitmap, a block
1455 * bitmap, and an inode table.
1457 overhead
+= (sbi
->s_groups_count
*
1458 (2 + sbi
->s_itb_per_group
));
1459 sbi
->s_overhead_last
= overhead
;
1461 sbi
->s_blocks_last
= le32_to_cpu(es
->s_blocks_count
);
1464 buf
->f_type
= EXT2_SUPER_MAGIC
;
1465 buf
->f_bsize
= sb
->s_blocksize
;
1466 buf
->f_blocks
= le32_to_cpu(es
->s_blocks_count
) - sbi
->s_overhead_last
;
1467 buf
->f_bfree
= ext2_count_free_blocks(sb
);
1468 es
->s_free_blocks_count
= cpu_to_le32(buf
->f_bfree
);
1469 buf
->f_bavail
= buf
->f_bfree
- le32_to_cpu(es
->s_r_blocks_count
);
1470 if (buf
->f_bfree
< le32_to_cpu(es
->s_r_blocks_count
))
1472 buf
->f_files
= le32_to_cpu(es
->s_inodes_count
);
1473 buf
->f_ffree
= ext2_count_free_inodes(sb
);
1474 es
->s_free_inodes_count
= cpu_to_le32(buf
->f_ffree
);
1475 buf
->f_namelen
= EXT2_NAME_LEN
;
1476 fsid
= le64_to_cpup((void *)es
->s_uuid
) ^
1477 le64_to_cpup((void *)es
->s_uuid
+ sizeof(u64
));
1478 buf
->f_fsid
.val
[0] = fsid
& 0xFFFFFFFFUL
;
1479 buf
->f_fsid
.val
[1] = (fsid
>> 32) & 0xFFFFFFFFUL
;
1480 spin_unlock(&sbi
->s_lock
);
1484 static struct dentry
*ext2_mount(struct file_system_type
*fs_type
,
1485 int flags
, const char *dev_name
, void *data
)
1487 return mount_bdev(fs_type
, flags
, dev_name
, data
, ext2_fill_super
);
1492 /* Read data from quotafile - avoid pagecache and such because we cannot afford
1493 * acquiring the locks... As quota files are never truncated and quota code
1494 * itself serializes the operations (and no one else should touch the files)
1495 * we don't have to be afraid of races */
1496 static ssize_t
ext2_quota_read(struct super_block
*sb
, int type
, char *data
,
1497 size_t len
, loff_t off
)
1499 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
1500 sector_t blk
= off
>> EXT2_BLOCK_SIZE_BITS(sb
);
1502 int offset
= off
& (sb
->s_blocksize
- 1);
1505 struct buffer_head tmp_bh
;
1506 struct buffer_head
*bh
;
1507 loff_t i_size
= i_size_read(inode
);
1511 if (off
+len
> i_size
)
1514 while (toread
> 0) {
1515 tocopy
= sb
->s_blocksize
- offset
< toread
?
1516 sb
->s_blocksize
- offset
: toread
;
1519 tmp_bh
.b_size
= sb
->s_blocksize
;
1520 err
= ext2_get_block(inode
, blk
, &tmp_bh
, 0);
1523 if (!buffer_mapped(&tmp_bh
)) /* A hole? */
1524 memset(data
, 0, tocopy
);
1526 bh
= sb_bread(sb
, tmp_bh
.b_blocknr
);
1529 memcpy(data
, bh
->b_data
+offset
, tocopy
);
1540 /* Write to quotafile */
1541 static ssize_t
ext2_quota_write(struct super_block
*sb
, int type
,
1542 const char *data
, size_t len
, loff_t off
)
1544 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
1545 sector_t blk
= off
>> EXT2_BLOCK_SIZE_BITS(sb
);
1547 int offset
= off
& (sb
->s_blocksize
- 1);
1549 size_t towrite
= len
;
1550 struct buffer_head tmp_bh
;
1551 struct buffer_head
*bh
;
1553 while (towrite
> 0) {
1554 tocopy
= sb
->s_blocksize
- offset
< towrite
?
1555 sb
->s_blocksize
- offset
: towrite
;
1558 tmp_bh
.b_size
= sb
->s_blocksize
;
1559 err
= ext2_get_block(inode
, blk
, &tmp_bh
, 1);
1562 if (offset
|| tocopy
!= EXT2_BLOCK_SIZE(sb
))
1563 bh
= sb_bread(sb
, tmp_bh
.b_blocknr
);
1565 bh
= sb_getblk(sb
, tmp_bh
.b_blocknr
);
1566 if (unlikely(!bh
)) {
1571 memcpy(bh
->b_data
+offset
, data
, tocopy
);
1572 flush_dcache_page(bh
->b_page
);
1573 set_buffer_uptodate(bh
);
1574 mark_buffer_dirty(bh
);
1585 if (inode
->i_size
< off
+len
-towrite
)
1586 i_size_write(inode
, off
+len
-towrite
);
1587 inode_inc_iversion(inode
);
1588 inode
->i_mtime
= inode
->i_ctime
= current_time(inode
);
1589 mark_inode_dirty(inode
);
1590 return len
- towrite
;
1593 static int ext2_quota_on(struct super_block
*sb
, int type
, int format_id
,
1594 const struct path
*path
)
1597 struct inode
*inode
;
1599 err
= dquot_quota_on(sb
, type
, format_id
, path
);
1603 inode
= d_inode(path
->dentry
);
1605 EXT2_I(inode
)->i_flags
|= EXT2_NOATIME_FL
| EXT2_IMMUTABLE_FL
;
1606 inode_set_flags(inode
, S_NOATIME
| S_IMMUTABLE
,
1607 S_NOATIME
| S_IMMUTABLE
);
1608 inode_unlock(inode
);
1609 mark_inode_dirty(inode
);
1614 static int ext2_quota_off(struct super_block
*sb
, int type
)
1616 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
1619 if (!inode
|| !igrab(inode
))
1622 err
= dquot_quota_off(sb
, type
);
1627 EXT2_I(inode
)->i_flags
&= ~(EXT2_NOATIME_FL
| EXT2_IMMUTABLE_FL
);
1628 inode_set_flags(inode
, 0, S_NOATIME
| S_IMMUTABLE
);
1629 inode_unlock(inode
);
1630 mark_inode_dirty(inode
);
1635 return dquot_quota_off(sb
, type
);
1640 static struct file_system_type ext2_fs_type
= {
1641 .owner
= THIS_MODULE
,
1643 .mount
= ext2_mount
,
1644 .kill_sb
= kill_block_super
,
1645 .fs_flags
= FS_REQUIRES_DEV
,
1647 MODULE_ALIAS_FS("ext2");
1649 static int __init
init_ext2_fs(void)
1653 err
= init_inodecache();
1656 err
= register_filesystem(&ext2_fs_type
);
1661 destroy_inodecache();
1665 static void __exit
exit_ext2_fs(void)
1667 unregister_filesystem(&ext2_fs_type
);
1668 destroy_inodecache();
1671 MODULE_AUTHOR("Remy Card and others");
1672 MODULE_DESCRIPTION("Second Extended Filesystem");
1673 MODULE_LICENSE("GPL");
1674 module_init(init_ext2_fs
)
1675 module_exit(exit_ext2_fs
)