2 * linux/fs/ext2/super.c
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
11 * linux/fs/minix/inode.c
13 * Copyright (C) 1991, 1992 Linus Torvalds
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
19 #include <linux/module.h>
20 #include <linux/string.h>
22 #include <linux/slab.h>
23 #include <linux/init.h>
24 #include <linux/blkdev.h>
25 #include <linux/parser.h>
26 #include <linux/random.h>
27 #include <linux/buffer_head.h>
28 #include <linux/exportfs.h>
29 #include <linux/vfs.h>
30 #include <linux/seq_file.h>
31 #include <linux/mount.h>
32 #include <linux/log2.h>
33 #include <linux/quotaops.h>
34 #include <asm/uaccess.h>
40 static void ext2_sync_super(struct super_block
*sb
,
41 struct ext2_super_block
*es
, int wait
);
42 static int ext2_remount (struct super_block
* sb
, int * flags
, char * data
);
43 static int ext2_statfs (struct dentry
* dentry
, struct kstatfs
* buf
);
44 static int ext2_sync_fs(struct super_block
*sb
, int wait
);
46 void ext2_error (struct super_block
* sb
, const char * function
,
47 const char * fmt
, ...)
50 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
51 struct ext2_super_block
*es
= sbi
->s_es
;
53 if (!(sb
->s_flags
& MS_RDONLY
)) {
54 spin_lock(&sbi
->s_lock
);
55 sbi
->s_mount_state
|= EXT2_ERROR_FS
;
56 es
->s_state
|= cpu_to_le16(EXT2_ERROR_FS
);
57 spin_unlock(&sbi
->s_lock
);
58 ext2_sync_super(sb
, es
, 1);
62 printk(KERN_CRIT
"EXT2-fs (%s): error: %s: ", sb
->s_id
, function
);
67 if (test_opt(sb
, ERRORS_PANIC
))
68 panic("EXT2-fs: panic from previous error\n");
69 if (test_opt(sb
, ERRORS_RO
)) {
70 ext2_msg(sb
, KERN_CRIT
,
71 "error: remounting filesystem read-only");
72 sb
->s_flags
|= MS_RDONLY
;
76 void ext2_msg(struct super_block
*sb
, const char *prefix
,
82 printk("%sEXT2-fs (%s): ", prefix
, sb
->s_id
);
89 * This must be called with sbi->s_lock held.
91 void ext2_update_dynamic_rev(struct super_block
*sb
)
93 struct ext2_super_block
*es
= EXT2_SB(sb
)->s_es
;
95 if (le32_to_cpu(es
->s_rev_level
) > EXT2_GOOD_OLD_REV
)
98 ext2_msg(sb
, KERN_WARNING
,
99 "warning: updating to rev %d because of "
100 "new feature flag, running e2fsck is recommended",
103 es
->s_first_ino
= cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO
);
104 es
->s_inode_size
= cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE
);
105 es
->s_rev_level
= cpu_to_le32(EXT2_DYNAMIC_REV
);
106 /* leave es->s_feature_*compat flags alone */
107 /* es->s_uuid will be set by e2fsck if empty */
110 * The rest of the superblock fields should be zero, and if not it
111 * means they are likely already in use, so leave them alone. We
112 * can leave it up to e2fsck to clean up any inconsistencies there.
116 static void ext2_put_super (struct super_block
* sb
)
120 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
123 ext2_write_super(sb
);
125 ext2_xattr_put_super(sb
);
126 if (!(sb
->s_flags
& MS_RDONLY
)) {
127 struct ext2_super_block
*es
= sbi
->s_es
;
129 spin_lock(&sbi
->s_lock
);
130 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
131 spin_unlock(&sbi
->s_lock
);
132 ext2_sync_super(sb
, es
, 1);
134 db_count
= sbi
->s_gdb_count
;
135 for (i
= 0; i
< db_count
; i
++)
136 if (sbi
->s_group_desc
[i
])
137 brelse (sbi
->s_group_desc
[i
]);
138 kfree(sbi
->s_group_desc
);
140 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
141 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
142 percpu_counter_destroy(&sbi
->s_dirs_counter
);
144 sb
->s_fs_info
= NULL
;
145 kfree(sbi
->s_blockgroup_lock
);
149 static struct kmem_cache
* ext2_inode_cachep
;
151 static struct inode
*ext2_alloc_inode(struct super_block
*sb
)
153 struct ext2_inode_info
*ei
;
154 ei
= (struct ext2_inode_info
*)kmem_cache_alloc(ext2_inode_cachep
, GFP_KERNEL
);
157 ei
->i_block_alloc_info
= NULL
;
158 ei
->vfs_inode
.i_version
= 1;
159 return &ei
->vfs_inode
;
162 static void ext2_destroy_inode(struct inode
*inode
)
164 kmem_cache_free(ext2_inode_cachep
, EXT2_I(inode
));
167 static void init_once(void *foo
)
169 struct ext2_inode_info
*ei
= (struct ext2_inode_info
*) foo
;
171 rwlock_init(&ei
->i_meta_lock
);
172 #ifdef CONFIG_EXT2_FS_XATTR
173 init_rwsem(&ei
->xattr_sem
);
175 mutex_init(&ei
->truncate_mutex
);
176 inode_init_once(&ei
->vfs_inode
);
179 static int init_inodecache(void)
181 ext2_inode_cachep
= kmem_cache_create("ext2_inode_cache",
182 sizeof(struct ext2_inode_info
),
183 0, (SLAB_RECLAIM_ACCOUNT
|
186 if (ext2_inode_cachep
== NULL
)
191 static void destroy_inodecache(void)
193 kmem_cache_destroy(ext2_inode_cachep
);
196 static void ext2_clear_inode(struct inode
*inode
)
198 struct ext2_block_alloc_info
*rsv
= EXT2_I(inode
)->i_block_alloc_info
;
201 ext2_discard_reservation(inode
);
202 EXT2_I(inode
)->i_block_alloc_info
= NULL
;
207 static int ext2_show_options(struct seq_file
*seq
, struct vfsmount
*vfs
)
209 struct super_block
*sb
= vfs
->mnt_sb
;
210 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
211 struct ext2_super_block
*es
= sbi
->s_es
;
212 unsigned long def_mount_opts
;
214 spin_lock(&sbi
->s_lock
);
215 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
217 if (sbi
->s_sb_block
!= 1)
218 seq_printf(seq
, ",sb=%lu", sbi
->s_sb_block
);
219 if (test_opt(sb
, MINIX_DF
))
220 seq_puts(seq
, ",minixdf");
221 if (test_opt(sb
, GRPID
))
222 seq_puts(seq
, ",grpid");
223 if (!test_opt(sb
, GRPID
) && (def_mount_opts
& EXT2_DEFM_BSDGROUPS
))
224 seq_puts(seq
, ",nogrpid");
225 if (sbi
->s_resuid
!= EXT2_DEF_RESUID
||
226 le16_to_cpu(es
->s_def_resuid
) != EXT2_DEF_RESUID
) {
227 seq_printf(seq
, ",resuid=%u", sbi
->s_resuid
);
229 if (sbi
->s_resgid
!= EXT2_DEF_RESGID
||
230 le16_to_cpu(es
->s_def_resgid
) != EXT2_DEF_RESGID
) {
231 seq_printf(seq
, ",resgid=%u", sbi
->s_resgid
);
233 if (test_opt(sb
, ERRORS_RO
)) {
234 int def_errors
= le16_to_cpu(es
->s_errors
);
236 if (def_errors
== EXT2_ERRORS_PANIC
||
237 def_errors
== EXT2_ERRORS_CONTINUE
) {
238 seq_puts(seq
, ",errors=remount-ro");
241 if (test_opt(sb
, ERRORS_CONT
))
242 seq_puts(seq
, ",errors=continue");
243 if (test_opt(sb
, ERRORS_PANIC
))
244 seq_puts(seq
, ",errors=panic");
245 if (test_opt(sb
, NO_UID32
))
246 seq_puts(seq
, ",nouid32");
247 if (test_opt(sb
, DEBUG
))
248 seq_puts(seq
, ",debug");
249 if (test_opt(sb
, OLDALLOC
))
250 seq_puts(seq
, ",oldalloc");
252 #ifdef CONFIG_EXT2_FS_XATTR
253 if (test_opt(sb
, XATTR_USER
))
254 seq_puts(seq
, ",user_xattr");
255 if (!test_opt(sb
, XATTR_USER
) &&
256 (def_mount_opts
& EXT2_DEFM_XATTR_USER
)) {
257 seq_puts(seq
, ",nouser_xattr");
261 #ifdef CONFIG_EXT2_FS_POSIX_ACL
262 if (test_opt(sb
, POSIX_ACL
))
263 seq_puts(seq
, ",acl");
264 if (!test_opt(sb
, POSIX_ACL
) && (def_mount_opts
& EXT2_DEFM_ACL
))
265 seq_puts(seq
, ",noacl");
268 if (test_opt(sb
, NOBH
))
269 seq_puts(seq
, ",nobh");
271 #if defined(CONFIG_QUOTA)
272 if (sbi
->s_mount_opt
& EXT2_MOUNT_USRQUOTA
)
273 seq_puts(seq
, ",usrquota");
275 if (sbi
->s_mount_opt
& EXT2_MOUNT_GRPQUOTA
)
276 seq_puts(seq
, ",grpquota");
279 #if defined(CONFIG_EXT2_FS_XIP)
280 if (sbi
->s_mount_opt
& EXT2_MOUNT_XIP
)
281 seq_puts(seq
, ",xip");
284 if (!test_opt(sb
, RESERVATION
))
285 seq_puts(seq
, ",noreservation");
287 spin_unlock(&sbi
->s_lock
);
292 static ssize_t
ext2_quota_read(struct super_block
*sb
, int type
, char *data
, size_t len
, loff_t off
);
293 static ssize_t
ext2_quota_write(struct super_block
*sb
, int type
, const char *data
, size_t len
, loff_t off
);
296 static const struct super_operations ext2_sops
= {
297 .alloc_inode
= ext2_alloc_inode
,
298 .destroy_inode
= ext2_destroy_inode
,
299 .write_inode
= ext2_write_inode
,
300 .delete_inode
= ext2_delete_inode
,
301 .put_super
= ext2_put_super
,
302 .write_super
= ext2_write_super
,
303 .sync_fs
= ext2_sync_fs
,
304 .statfs
= ext2_statfs
,
305 .remount_fs
= ext2_remount
,
306 .clear_inode
= ext2_clear_inode
,
307 .show_options
= ext2_show_options
,
309 .quota_read
= ext2_quota_read
,
310 .quota_write
= ext2_quota_write
,
314 static struct inode
*ext2_nfs_get_inode(struct super_block
*sb
,
315 u64 ino
, u32 generation
)
319 if (ino
< EXT2_FIRST_INO(sb
) && ino
!= EXT2_ROOT_INO
)
320 return ERR_PTR(-ESTALE
);
321 if (ino
> le32_to_cpu(EXT2_SB(sb
)->s_es
->s_inodes_count
))
322 return ERR_PTR(-ESTALE
);
324 /* iget isn't really right if the inode is currently unallocated!!
325 * ext2_read_inode currently does appropriate checks, but
326 * it might be "neater" to call ext2_get_inode first and check
327 * if the inode is valid.....
329 inode
= ext2_iget(sb
, ino
);
331 return ERR_CAST(inode
);
332 if (generation
&& inode
->i_generation
!= generation
) {
333 /* we didn't find the right inode.. */
335 return ERR_PTR(-ESTALE
);
340 static struct dentry
*ext2_fh_to_dentry(struct super_block
*sb
, struct fid
*fid
,
341 int fh_len
, int fh_type
)
343 return generic_fh_to_dentry(sb
, fid
, fh_len
, fh_type
,
347 static struct dentry
*ext2_fh_to_parent(struct super_block
*sb
, struct fid
*fid
,
348 int fh_len
, int fh_type
)
350 return generic_fh_to_parent(sb
, fid
, fh_len
, fh_type
,
354 /* Yes, most of these are left as NULL!!
355 * A NULL value implies the default, which works with ext2-like file
356 * systems, but can be improved upon.
357 * Currently only get_parent is required.
359 static const struct export_operations ext2_export_ops
= {
360 .fh_to_dentry
= ext2_fh_to_dentry
,
361 .fh_to_parent
= ext2_fh_to_parent
,
362 .get_parent
= ext2_get_parent
,
365 static unsigned long get_sb_block(void **data
)
367 unsigned long sb_block
;
368 char *options
= (char *) *data
;
370 if (!options
|| strncmp(options
, "sb=", 3) != 0)
371 return 1; /* Default location */
373 sb_block
= simple_strtoul(options
, &options
, 0);
374 if (*options
&& *options
!= ',') {
375 printk("EXT2-fs: Invalid sb specification: %s\n",
381 *data
= (void *) options
;
386 Opt_bsd_df
, Opt_minix_df
, Opt_grpid
, Opt_nogrpid
,
387 Opt_resgid
, Opt_resuid
, Opt_sb
, Opt_err_cont
, Opt_err_panic
,
388 Opt_err_ro
, Opt_nouid32
, Opt_nocheck
, Opt_debug
,
389 Opt_oldalloc
, Opt_orlov
, Opt_nobh
, Opt_user_xattr
, Opt_nouser_xattr
,
390 Opt_acl
, Opt_noacl
, Opt_xip
, Opt_ignore
, Opt_err
, Opt_quota
,
391 Opt_usrquota
, Opt_grpquota
, Opt_reservation
, Opt_noreservation
394 static const match_table_t tokens
= {
395 {Opt_bsd_df
, "bsddf"},
396 {Opt_minix_df
, "minixdf"},
397 {Opt_grpid
, "grpid"},
398 {Opt_grpid
, "bsdgroups"},
399 {Opt_nogrpid
, "nogrpid"},
400 {Opt_nogrpid
, "sysvgroups"},
401 {Opt_resgid
, "resgid=%u"},
402 {Opt_resuid
, "resuid=%u"},
404 {Opt_err_cont
, "errors=continue"},
405 {Opt_err_panic
, "errors=panic"},
406 {Opt_err_ro
, "errors=remount-ro"},
407 {Opt_nouid32
, "nouid32"},
408 {Opt_nocheck
, "check=none"},
409 {Opt_nocheck
, "nocheck"},
410 {Opt_debug
, "debug"},
411 {Opt_oldalloc
, "oldalloc"},
412 {Opt_orlov
, "orlov"},
414 {Opt_user_xattr
, "user_xattr"},
415 {Opt_nouser_xattr
, "nouser_xattr"},
417 {Opt_noacl
, "noacl"},
419 {Opt_grpquota
, "grpquota"},
420 {Opt_ignore
, "noquota"},
421 {Opt_quota
, "quota"},
422 {Opt_usrquota
, "usrquota"},
423 {Opt_reservation
, "reservation"},
424 {Opt_noreservation
, "noreservation"},
428 static int parse_options(char *options
, struct super_block
*sb
)
431 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
432 substring_t args
[MAX_OPT_ARGS
];
438 while ((p
= strsep (&options
, ",")) != NULL
) {
443 token
= match_token(p
, tokens
, args
);
446 clear_opt (sbi
->s_mount_opt
, MINIX_DF
);
449 set_opt (sbi
->s_mount_opt
, MINIX_DF
);
452 set_opt (sbi
->s_mount_opt
, GRPID
);
455 clear_opt (sbi
->s_mount_opt
, GRPID
);
458 if (match_int(&args
[0], &option
))
460 sbi
->s_resuid
= option
;
463 if (match_int(&args
[0], &option
))
465 sbi
->s_resgid
= option
;
468 /* handled by get_sb_block() instead of here */
469 /* *sb_block = match_int(&args[0]); */
472 clear_opt (sbi
->s_mount_opt
, ERRORS_CONT
);
473 clear_opt (sbi
->s_mount_opt
, ERRORS_RO
);
474 set_opt (sbi
->s_mount_opt
, ERRORS_PANIC
);
477 clear_opt (sbi
->s_mount_opt
, ERRORS_CONT
);
478 clear_opt (sbi
->s_mount_opt
, ERRORS_PANIC
);
479 set_opt (sbi
->s_mount_opt
, ERRORS_RO
);
482 clear_opt (sbi
->s_mount_opt
, ERRORS_RO
);
483 clear_opt (sbi
->s_mount_opt
, ERRORS_PANIC
);
484 set_opt (sbi
->s_mount_opt
, ERRORS_CONT
);
487 set_opt (sbi
->s_mount_opt
, NO_UID32
);
490 clear_opt (sbi
->s_mount_opt
, CHECK
);
493 set_opt (sbi
->s_mount_opt
, DEBUG
);
496 set_opt (sbi
->s_mount_opt
, OLDALLOC
);
499 clear_opt (sbi
->s_mount_opt
, OLDALLOC
);
502 set_opt (sbi
->s_mount_opt
, NOBH
);
504 #ifdef CONFIG_EXT2_FS_XATTR
506 set_opt (sbi
->s_mount_opt
, XATTR_USER
);
508 case Opt_nouser_xattr
:
509 clear_opt (sbi
->s_mount_opt
, XATTR_USER
);
513 case Opt_nouser_xattr
:
514 ext2_msg(sb
, KERN_INFO
, "(no)user_xattr options"
518 #ifdef CONFIG_EXT2_FS_POSIX_ACL
520 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
523 clear_opt(sbi
->s_mount_opt
, POSIX_ACL
);
528 ext2_msg(sb
, KERN_INFO
,
529 "(no)acl options not supported");
533 #ifdef CONFIG_EXT2_FS_XIP
534 set_opt (sbi
->s_mount_opt
, XIP
);
536 ext2_msg(sb
, KERN_INFO
, "xip option not supported");
540 #if defined(CONFIG_QUOTA)
543 set_opt(sbi
->s_mount_opt
, USRQUOTA
);
547 set_opt(sbi
->s_mount_opt
, GRPQUOTA
);
553 ext2_msg(sb
, KERN_INFO
,
554 "quota operations not supported");
558 case Opt_reservation
:
559 set_opt(sbi
->s_mount_opt
, RESERVATION
);
560 ext2_msg(sb
, KERN_INFO
, "reservations ON");
562 case Opt_noreservation
:
563 clear_opt(sbi
->s_mount_opt
, RESERVATION
);
564 ext2_msg(sb
, KERN_INFO
, "reservations OFF");
575 static int ext2_setup_super (struct super_block
* sb
,
576 struct ext2_super_block
* es
,
580 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
582 if (le32_to_cpu(es
->s_rev_level
) > EXT2_MAX_SUPP_REV
) {
583 ext2_msg(sb
, KERN_ERR
,
584 "error: revision level too high, "
585 "forcing read-only mode");
590 if (!(sbi
->s_mount_state
& EXT2_VALID_FS
))
591 ext2_msg(sb
, KERN_WARNING
,
592 "warning: mounting unchecked fs, "
593 "running e2fsck is recommended");
594 else if ((sbi
->s_mount_state
& EXT2_ERROR_FS
))
595 ext2_msg(sb
, KERN_WARNING
,
596 "warning: mounting fs with errors, "
597 "running e2fsck is recommended");
598 else if ((__s16
) le16_to_cpu(es
->s_max_mnt_count
) >= 0 &&
599 le16_to_cpu(es
->s_mnt_count
) >=
600 (unsigned short) (__s16
) le16_to_cpu(es
->s_max_mnt_count
))
601 ext2_msg(sb
, KERN_WARNING
,
602 "warning: maximal mount count reached, "
603 "running e2fsck is recommended");
604 else if (le32_to_cpu(es
->s_checkinterval
) &&
605 (le32_to_cpu(es
->s_lastcheck
) +
606 le32_to_cpu(es
->s_checkinterval
) <= get_seconds()))
607 ext2_msg(sb
, KERN_WARNING
,
608 "warning: checktime reached, "
609 "running e2fsck is recommended");
610 if (!le16_to_cpu(es
->s_max_mnt_count
))
611 es
->s_max_mnt_count
= cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT
);
612 le16_add_cpu(&es
->s_mnt_count
, 1);
613 if (test_opt (sb
, DEBUG
))
614 ext2_msg(sb
, KERN_INFO
, "%s, %s, bs=%lu, fs=%lu, gc=%lu, "
615 "bpg=%lu, ipg=%lu, mo=%04lx]",
616 EXT2FS_VERSION
, EXT2FS_DATE
, sb
->s_blocksize
,
619 EXT2_BLOCKS_PER_GROUP(sb
),
620 EXT2_INODES_PER_GROUP(sb
),
625 static int ext2_check_descriptors(struct super_block
*sb
)
628 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
630 ext2_debug ("Checking group descriptors");
632 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
633 struct ext2_group_desc
*gdp
= ext2_get_group_desc(sb
, i
, NULL
);
634 ext2_fsblk_t first_block
= ext2_group_first_block_no(sb
, i
);
635 ext2_fsblk_t last_block
;
637 if (i
== sbi
->s_groups_count
- 1)
638 last_block
= le32_to_cpu(sbi
->s_es
->s_blocks_count
) - 1;
640 last_block
= first_block
+
641 (EXT2_BLOCKS_PER_GROUP(sb
) - 1);
643 if (le32_to_cpu(gdp
->bg_block_bitmap
) < first_block
||
644 le32_to_cpu(gdp
->bg_block_bitmap
) > last_block
)
646 ext2_error (sb
, "ext2_check_descriptors",
647 "Block bitmap for group %d"
648 " not in group (block %lu)!",
649 i
, (unsigned long) le32_to_cpu(gdp
->bg_block_bitmap
));
652 if (le32_to_cpu(gdp
->bg_inode_bitmap
) < first_block
||
653 le32_to_cpu(gdp
->bg_inode_bitmap
) > last_block
)
655 ext2_error (sb
, "ext2_check_descriptors",
656 "Inode bitmap for group %d"
657 " not in group (block %lu)!",
658 i
, (unsigned long) le32_to_cpu(gdp
->bg_inode_bitmap
));
661 if (le32_to_cpu(gdp
->bg_inode_table
) < first_block
||
662 le32_to_cpu(gdp
->bg_inode_table
) + sbi
->s_itb_per_group
- 1 >
665 ext2_error (sb
, "ext2_check_descriptors",
666 "Inode table for group %d"
667 " not in group (block %lu)!",
668 i
, (unsigned long) le32_to_cpu(gdp
->bg_inode_table
));
676 * Maximal file size. There is a direct, and {,double-,triple-}indirect
677 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
678 * We need to be 1 filesystem block less than the 2^32 sector limit.
680 static loff_t
ext2_max_size(int bits
)
682 loff_t res
= EXT2_NDIR_BLOCKS
;
686 /* This is calculated to be the largest file size for a
687 * dense, file such that the total number of
688 * sectors in the file, including data and all indirect blocks,
689 * does not exceed 2^32 -1
690 * __u32 i_blocks representing the total number of
691 * 512 bytes blocks of the file
693 upper_limit
= (1LL << 32) - 1;
695 /* total blocks in file system block size */
696 upper_limit
>>= (bits
- 9);
699 /* indirect blocks */
701 /* double indirect blocks */
702 meta_blocks
+= 1 + (1LL << (bits
-2));
703 /* tripple indirect blocks */
704 meta_blocks
+= 1 + (1LL << (bits
-2)) + (1LL << (2*(bits
-2)));
706 upper_limit
-= meta_blocks
;
707 upper_limit
<<= bits
;
709 res
+= 1LL << (bits
-2);
710 res
+= 1LL << (2*(bits
-2));
711 res
+= 1LL << (3*(bits
-2));
713 if (res
> upper_limit
)
716 if (res
> MAX_LFS_FILESIZE
)
717 res
= MAX_LFS_FILESIZE
;
722 static unsigned long descriptor_loc(struct super_block
*sb
,
723 unsigned long logic_sb_block
,
726 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
727 unsigned long bg
, first_meta_bg
;
730 first_meta_bg
= le32_to_cpu(sbi
->s_es
->s_first_meta_bg
);
732 if (!EXT2_HAS_INCOMPAT_FEATURE(sb
, EXT2_FEATURE_INCOMPAT_META_BG
) ||
734 return (logic_sb_block
+ nr
+ 1);
735 bg
= sbi
->s_desc_per_block
* nr
;
736 if (ext2_bg_has_super(sb
, bg
))
739 return ext2_group_first_block_no(sb
, bg
) + has_super
;
742 static int ext2_fill_super(struct super_block
*sb
, void *data
, int silent
)
744 struct buffer_head
* bh
;
745 struct ext2_sb_info
* sbi
;
746 struct ext2_super_block
* es
;
749 unsigned long sb_block
= get_sb_block(&data
);
750 unsigned long logic_sb_block
;
751 unsigned long offset
= 0;
752 unsigned long def_mount_opts
;
754 int blocksize
= BLOCK_SIZE
;
760 sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
764 sbi
->s_blockgroup_lock
=
765 kzalloc(sizeof(struct blockgroup_lock
), GFP_KERNEL
);
766 if (!sbi
->s_blockgroup_lock
) {
771 sbi
->s_sb_block
= sb_block
;
773 spin_lock_init(&sbi
->s_lock
);
776 * See what the current blocksize for the device is, and
777 * use that as the blocksize. Otherwise (or if the blocksize
778 * is smaller than the default) use the default.
779 * This is important for devices that have a hardware
780 * sectorsize that is larger than the default.
782 blocksize
= sb_min_blocksize(sb
, BLOCK_SIZE
);
784 ext2_msg(sb
, KERN_ERR
, "error: unable to set blocksize");
789 * If the superblock doesn't start on a hardware sector boundary,
790 * calculate the offset.
792 if (blocksize
!= BLOCK_SIZE
) {
793 logic_sb_block
= (sb_block
*BLOCK_SIZE
) / blocksize
;
794 offset
= (sb_block
*BLOCK_SIZE
) % blocksize
;
796 logic_sb_block
= sb_block
;
799 if (!(bh
= sb_bread(sb
, logic_sb_block
))) {
800 ext2_msg(sb
, KERN_ERR
, "error: unable to read superblock");
804 * Note: s_es must be initialized as soon as possible because
805 * some ext2 macro-instructions depend on its value
807 es
= (struct ext2_super_block
*) (((char *)bh
->b_data
) + offset
);
809 sb
->s_magic
= le16_to_cpu(es
->s_magic
);
811 if (sb
->s_magic
!= EXT2_SUPER_MAGIC
)
814 /* Set defaults before we parse the mount options */
815 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
816 if (def_mount_opts
& EXT2_DEFM_DEBUG
)
817 set_opt(sbi
->s_mount_opt
, DEBUG
);
818 if (def_mount_opts
& EXT2_DEFM_BSDGROUPS
)
819 set_opt(sbi
->s_mount_opt
, GRPID
);
820 if (def_mount_opts
& EXT2_DEFM_UID16
)
821 set_opt(sbi
->s_mount_opt
, NO_UID32
);
822 #ifdef CONFIG_EXT2_FS_XATTR
823 if (def_mount_opts
& EXT2_DEFM_XATTR_USER
)
824 set_opt(sbi
->s_mount_opt
, XATTR_USER
);
826 #ifdef CONFIG_EXT2_FS_POSIX_ACL
827 if (def_mount_opts
& EXT2_DEFM_ACL
)
828 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
831 if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT2_ERRORS_PANIC
)
832 set_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
833 else if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT2_ERRORS_CONTINUE
)
834 set_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
836 set_opt(sbi
->s_mount_opt
, ERRORS_RO
);
838 sbi
->s_resuid
= le16_to_cpu(es
->s_def_resuid
);
839 sbi
->s_resgid
= le16_to_cpu(es
->s_def_resgid
);
841 set_opt(sbi
->s_mount_opt
, RESERVATION
);
843 if (!parse_options((char *) data
, sb
))
846 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
847 ((EXT2_SB(sb
)->s_mount_opt
& EXT2_MOUNT_POSIX_ACL
) ?
850 ext2_xip_verify_sb(sb
); /* see if bdev supports xip, unset
851 EXT2_MOUNT_XIP if not */
853 if (le32_to_cpu(es
->s_rev_level
) == EXT2_GOOD_OLD_REV
&&
854 (EXT2_HAS_COMPAT_FEATURE(sb
, ~0U) ||
855 EXT2_HAS_RO_COMPAT_FEATURE(sb
, ~0U) ||
856 EXT2_HAS_INCOMPAT_FEATURE(sb
, ~0U)))
857 ext2_msg(sb
, KERN_WARNING
,
858 "warning: feature flags set on rev 0 fs, "
859 "running e2fsck is recommended");
861 * Check feature flags regardless of the revision level, since we
862 * previously didn't change the revision level when setting the flags,
863 * so there is a chance incompat flags are set on a rev 0 filesystem.
865 features
= EXT2_HAS_INCOMPAT_FEATURE(sb
, ~EXT2_FEATURE_INCOMPAT_SUPP
);
867 ext2_msg(sb
, KERN_ERR
, "error: couldn't mount because of "
868 "unsupported optional features (%x)",
869 le32_to_cpu(features
));
872 if (!(sb
->s_flags
& MS_RDONLY
) &&
873 (features
= EXT2_HAS_RO_COMPAT_FEATURE(sb
, ~EXT2_FEATURE_RO_COMPAT_SUPP
))){
874 ext2_msg(sb
, KERN_ERR
, "error: couldn't mount RDWR because of "
875 "unsupported optional features (%x)",
876 le32_to_cpu(features
));
880 blocksize
= BLOCK_SIZE
<< le32_to_cpu(sbi
->s_es
->s_log_block_size
);
882 if (ext2_use_xip(sb
) && blocksize
!= PAGE_SIZE
) {
884 ext2_msg(sb
, KERN_ERR
,
885 "error: unsupported blocksize for xip");
889 /* If the blocksize doesn't match, re-read the thing.. */
890 if (sb
->s_blocksize
!= blocksize
) {
893 if (!sb_set_blocksize(sb
, blocksize
)) {
894 ext2_msg(sb
, KERN_ERR
, "error: blocksize is too small");
898 logic_sb_block
= (sb_block
*BLOCK_SIZE
) / blocksize
;
899 offset
= (sb_block
*BLOCK_SIZE
) % blocksize
;
900 bh
= sb_bread(sb
, logic_sb_block
);
902 ext2_msg(sb
, KERN_ERR
, "error: couldn't read"
903 "superblock on 2nd try");
906 es
= (struct ext2_super_block
*) (((char *)bh
->b_data
) + offset
);
908 if (es
->s_magic
!= cpu_to_le16(EXT2_SUPER_MAGIC
)) {
909 ext2_msg(sb
, KERN_ERR
, "error: magic mismatch");
914 sb
->s_maxbytes
= ext2_max_size(sb
->s_blocksize_bits
);
916 if (le32_to_cpu(es
->s_rev_level
) == EXT2_GOOD_OLD_REV
) {
917 sbi
->s_inode_size
= EXT2_GOOD_OLD_INODE_SIZE
;
918 sbi
->s_first_ino
= EXT2_GOOD_OLD_FIRST_INO
;
920 sbi
->s_inode_size
= le16_to_cpu(es
->s_inode_size
);
921 sbi
->s_first_ino
= le32_to_cpu(es
->s_first_ino
);
922 if ((sbi
->s_inode_size
< EXT2_GOOD_OLD_INODE_SIZE
) ||
923 !is_power_of_2(sbi
->s_inode_size
) ||
924 (sbi
->s_inode_size
> blocksize
)) {
925 ext2_msg(sb
, KERN_ERR
,
926 "error: unsupported inode size: %d",
932 sbi
->s_frag_size
= EXT2_MIN_FRAG_SIZE
<<
933 le32_to_cpu(es
->s_log_frag_size
);
934 if (sbi
->s_frag_size
== 0)
936 sbi
->s_frags_per_block
= sb
->s_blocksize
/ sbi
->s_frag_size
;
938 sbi
->s_blocks_per_group
= le32_to_cpu(es
->s_blocks_per_group
);
939 sbi
->s_frags_per_group
= le32_to_cpu(es
->s_frags_per_group
);
940 sbi
->s_inodes_per_group
= le32_to_cpu(es
->s_inodes_per_group
);
942 if (EXT2_INODE_SIZE(sb
) == 0)
944 sbi
->s_inodes_per_block
= sb
->s_blocksize
/ EXT2_INODE_SIZE(sb
);
945 if (sbi
->s_inodes_per_block
== 0 || sbi
->s_inodes_per_group
== 0)
947 sbi
->s_itb_per_group
= sbi
->s_inodes_per_group
/
948 sbi
->s_inodes_per_block
;
949 sbi
->s_desc_per_block
= sb
->s_blocksize
/
950 sizeof (struct ext2_group_desc
);
952 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
953 sbi
->s_addr_per_block_bits
=
954 ilog2 (EXT2_ADDR_PER_BLOCK(sb
));
955 sbi
->s_desc_per_block_bits
=
956 ilog2 (EXT2_DESC_PER_BLOCK(sb
));
958 if (sb
->s_magic
!= EXT2_SUPER_MAGIC
)
961 if (sb
->s_blocksize
!= bh
->b_size
) {
963 ext2_msg(sb
, KERN_ERR
, "error: unsupported blocksize");
967 if (sb
->s_blocksize
!= sbi
->s_frag_size
) {
968 ext2_msg(sb
, KERN_ERR
,
969 "error: fragsize %lu != blocksize %lu"
970 "(not supported yet)",
971 sbi
->s_frag_size
, sb
->s_blocksize
);
975 if (sbi
->s_blocks_per_group
> sb
->s_blocksize
* 8) {
976 ext2_msg(sb
, KERN_ERR
,
977 "error: #blocks per group too big: %lu",
978 sbi
->s_blocks_per_group
);
981 if (sbi
->s_frags_per_group
> sb
->s_blocksize
* 8) {
982 ext2_msg(sb
, KERN_ERR
,
983 "error: #fragments per group too big: %lu",
984 sbi
->s_frags_per_group
);
987 if (sbi
->s_inodes_per_group
> sb
->s_blocksize
* 8) {
988 ext2_msg(sb
, KERN_ERR
,
989 "error: #inodes per group too big: %lu",
990 sbi
->s_inodes_per_group
);
994 if (EXT2_BLOCKS_PER_GROUP(sb
) == 0)
996 sbi
->s_groups_count
= ((le32_to_cpu(es
->s_blocks_count
) -
997 le32_to_cpu(es
->s_first_data_block
) - 1)
998 / EXT2_BLOCKS_PER_GROUP(sb
)) + 1;
999 db_count
= (sbi
->s_groups_count
+ EXT2_DESC_PER_BLOCK(sb
) - 1) /
1000 EXT2_DESC_PER_BLOCK(sb
);
1001 sbi
->s_group_desc
= kmalloc (db_count
* sizeof (struct buffer_head
*), GFP_KERNEL
);
1002 if (sbi
->s_group_desc
== NULL
) {
1003 ext2_msg(sb
, KERN_ERR
, "error: not enough memory");
1006 bgl_lock_init(sbi
->s_blockgroup_lock
);
1007 sbi
->s_debts
= kcalloc(sbi
->s_groups_count
, sizeof(*sbi
->s_debts
), GFP_KERNEL
);
1008 if (!sbi
->s_debts
) {
1009 ext2_msg(sb
, KERN_ERR
, "error: not enough memory");
1010 goto failed_mount_group_desc
;
1012 for (i
= 0; i
< db_count
; i
++) {
1013 block
= descriptor_loc(sb
, logic_sb_block
, i
);
1014 sbi
->s_group_desc
[i
] = sb_bread(sb
, block
);
1015 if (!sbi
->s_group_desc
[i
]) {
1016 for (j
= 0; j
< i
; j
++)
1017 brelse (sbi
->s_group_desc
[j
]);
1018 ext2_msg(sb
, KERN_ERR
,
1019 "error: unable to read group descriptors");
1020 goto failed_mount_group_desc
;
1023 if (!ext2_check_descriptors (sb
)) {
1024 ext2_msg(sb
, KERN_ERR
, "group descriptors corrupted");
1027 sbi
->s_gdb_count
= db_count
;
1028 get_random_bytes(&sbi
->s_next_generation
, sizeof(u32
));
1029 spin_lock_init(&sbi
->s_next_gen_lock
);
1031 /* per fileystem reservation list head & lock */
1032 spin_lock_init(&sbi
->s_rsv_window_lock
);
1033 sbi
->s_rsv_window_root
= RB_ROOT
;
1035 * Add a single, static dummy reservation to the start of the
1036 * reservation window list --- it gives us a placeholder for
1037 * append-at-start-of-list which makes the allocation logic
1040 sbi
->s_rsv_window_head
.rsv_start
= EXT2_RESERVE_WINDOW_NOT_ALLOCATED
;
1041 sbi
->s_rsv_window_head
.rsv_end
= EXT2_RESERVE_WINDOW_NOT_ALLOCATED
;
1042 sbi
->s_rsv_window_head
.rsv_alloc_hit
= 0;
1043 sbi
->s_rsv_window_head
.rsv_goal_size
= 0;
1044 ext2_rsv_window_add(sb
, &sbi
->s_rsv_window_head
);
1046 err
= percpu_counter_init(&sbi
->s_freeblocks_counter
,
1047 ext2_count_free_blocks(sb
));
1049 err
= percpu_counter_init(&sbi
->s_freeinodes_counter
,
1050 ext2_count_free_inodes(sb
));
1053 err
= percpu_counter_init(&sbi
->s_dirs_counter
,
1054 ext2_count_dirs(sb
));
1057 ext2_msg(sb
, KERN_ERR
, "error: insufficient memory");
1061 * set up enough so that it can read an inode
1063 sb
->s_op
= &ext2_sops
;
1064 sb
->s_export_op
= &ext2_export_ops
;
1065 sb
->s_xattr
= ext2_xattr_handlers
;
1066 root
= ext2_iget(sb
, EXT2_ROOT_INO
);
1068 ret
= PTR_ERR(root
);
1071 if (!S_ISDIR(root
->i_mode
) || !root
->i_blocks
|| !root
->i_size
) {
1073 ext2_msg(sb
, KERN_ERR
, "error: corrupt root inode, run e2fsck");
1077 sb
->s_root
= d_alloc_root(root
);
1080 ext2_msg(sb
, KERN_ERR
, "error: get root inode failed");
1084 if (EXT2_HAS_COMPAT_FEATURE(sb
, EXT3_FEATURE_COMPAT_HAS_JOURNAL
))
1085 ext2_msg(sb
, KERN_WARNING
,
1086 "warning: mounting ext3 filesystem as ext2");
1087 if (ext2_setup_super (sb
, es
, sb
->s_flags
& MS_RDONLY
))
1088 sb
->s_flags
|= MS_RDONLY
;
1089 ext2_write_super(sb
);
1094 ext2_msg(sb
, KERN_ERR
,
1095 "error: can't find an ext2 filesystem on dev %s.",
1099 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
1100 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
1101 percpu_counter_destroy(&sbi
->s_dirs_counter
);
1103 for (i
= 0; i
< db_count
; i
++)
1104 brelse(sbi
->s_group_desc
[i
]);
1105 failed_mount_group_desc
:
1106 kfree(sbi
->s_group_desc
);
1107 kfree(sbi
->s_debts
);
1111 sb
->s_fs_info
= NULL
;
1112 kfree(sbi
->s_blockgroup_lock
);
1117 static void ext2_clear_super_error(struct super_block
*sb
)
1119 struct buffer_head
*sbh
= EXT2_SB(sb
)->s_sbh
;
1121 if (buffer_write_io_error(sbh
)) {
1123 * Oh, dear. A previous attempt to write the
1124 * superblock failed. This could happen because the
1125 * USB device was yanked out. Or it could happen to
1126 * be a transient write error and maybe the block will
1127 * be remapped. Nothing we can do but to retry the
1128 * write and hope for the best.
1130 ext2_msg(sb
, KERN_ERR
,
1131 "previous I/O error to superblock detected\n");
1132 clear_buffer_write_io_error(sbh
);
1133 set_buffer_uptodate(sbh
);
1137 static void ext2_sync_super(struct super_block
*sb
, struct ext2_super_block
*es
,
1140 ext2_clear_super_error(sb
);
1141 spin_lock(&EXT2_SB(sb
)->s_lock
);
1142 es
->s_free_blocks_count
= cpu_to_le32(ext2_count_free_blocks(sb
));
1143 es
->s_free_inodes_count
= cpu_to_le32(ext2_count_free_inodes(sb
));
1144 es
->s_wtime
= cpu_to_le32(get_seconds());
1145 /* unlock before we do IO */
1146 spin_unlock(&EXT2_SB(sb
)->s_lock
);
1147 mark_buffer_dirty(EXT2_SB(sb
)->s_sbh
);
1149 sync_dirty_buffer(EXT2_SB(sb
)->s_sbh
);
1154 * In the second extended file system, it is not necessary to
1155 * write the super block since we use a mapping of the
1156 * disk super block in a buffer.
1158 * However, this function is still used to set the fs valid
1159 * flags to 0. We need to set this flag to 0 since the fs
1160 * may have been checked while mounted and e2fsck may have
1161 * set s_state to EXT2_VALID_FS after some corrections.
1163 static int ext2_sync_fs(struct super_block
*sb
, int wait
)
1165 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
1166 struct ext2_super_block
*es
= EXT2_SB(sb
)->s_es
;
1168 spin_lock(&sbi
->s_lock
);
1169 if (es
->s_state
& cpu_to_le16(EXT2_VALID_FS
)) {
1170 ext2_debug("setting valid to 0\n");
1171 es
->s_state
&= cpu_to_le16(~EXT2_VALID_FS
);
1173 spin_unlock(&sbi
->s_lock
);
1174 ext2_sync_super(sb
, es
, wait
);
1179 void ext2_write_super(struct super_block
*sb
)
1181 if (!(sb
->s_flags
& MS_RDONLY
))
1182 ext2_sync_fs(sb
, 1);
1187 static int ext2_remount (struct super_block
* sb
, int * flags
, char * data
)
1189 struct ext2_sb_info
* sbi
= EXT2_SB(sb
);
1190 struct ext2_super_block
* es
;
1191 unsigned long old_mount_opt
= sbi
->s_mount_opt
;
1192 struct ext2_mount_options old_opts
;
1193 unsigned long old_sb_flags
;
1196 spin_lock(&sbi
->s_lock
);
1198 /* Store the old options */
1199 old_sb_flags
= sb
->s_flags
;
1200 old_opts
.s_mount_opt
= sbi
->s_mount_opt
;
1201 old_opts
.s_resuid
= sbi
->s_resuid
;
1202 old_opts
.s_resgid
= sbi
->s_resgid
;
1205 * Allow the "check" option to be passed as a remount option.
1207 if (!parse_options(data
, sb
)) {
1212 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
1213 ((sbi
->s_mount_opt
& EXT2_MOUNT_POSIX_ACL
) ? MS_POSIXACL
: 0);
1215 ext2_xip_verify_sb(sb
); /* see if bdev supports xip, unset
1216 EXT2_MOUNT_XIP if not */
1218 if ((ext2_use_xip(sb
)) && (sb
->s_blocksize
!= PAGE_SIZE
)) {
1219 ext2_msg(sb
, KERN_WARNING
,
1220 "warning: unsupported blocksize for xip");
1226 if (((sbi
->s_mount_opt
& EXT2_MOUNT_XIP
) !=
1227 (old_mount_opt
& EXT2_MOUNT_XIP
)) &&
1228 invalidate_inodes(sb
)) {
1229 ext2_msg(sb
, KERN_WARNING
, "warning: refusing change of "
1230 "xip flag with busy inodes while remounting");
1231 sbi
->s_mount_opt
&= ~EXT2_MOUNT_XIP
;
1232 sbi
->s_mount_opt
|= old_mount_opt
& EXT2_MOUNT_XIP
;
1234 if ((*flags
& MS_RDONLY
) == (sb
->s_flags
& MS_RDONLY
)) {
1235 spin_unlock(&sbi
->s_lock
);
1238 if (*flags
& MS_RDONLY
) {
1239 if (le16_to_cpu(es
->s_state
) & EXT2_VALID_FS
||
1240 !(sbi
->s_mount_state
& EXT2_VALID_FS
)) {
1241 spin_unlock(&sbi
->s_lock
);
1245 * OK, we are remounting a valid rw partition rdonly, so set
1246 * the rdonly flag and then mark the partition as valid again.
1248 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
1249 es
->s_mtime
= cpu_to_le32(get_seconds());
1250 spin_unlock(&sbi
->s_lock
);
1251 ext2_sync_super(sb
, es
, 1);
1253 __le32 ret
= EXT2_HAS_RO_COMPAT_FEATURE(sb
,
1254 ~EXT2_FEATURE_RO_COMPAT_SUPP
);
1256 ext2_msg(sb
, KERN_WARNING
,
1257 "warning: couldn't remount RDWR because of "
1258 "unsupported optional features (%x).",
1264 * Mounting a RDONLY partition read-write, so reread and
1265 * store the current valid flag. (It may have been changed
1266 * by e2fsck since we originally mounted the partition.)
1268 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
1269 if (!ext2_setup_super (sb
, es
, 0))
1270 sb
->s_flags
&= ~MS_RDONLY
;
1271 spin_unlock(&sbi
->s_lock
);
1272 ext2_write_super(sb
);
1276 sbi
->s_mount_opt
= old_opts
.s_mount_opt
;
1277 sbi
->s_resuid
= old_opts
.s_resuid
;
1278 sbi
->s_resgid
= old_opts
.s_resgid
;
1279 sb
->s_flags
= old_sb_flags
;
1280 spin_unlock(&sbi
->s_lock
);
1284 static int ext2_statfs (struct dentry
* dentry
, struct kstatfs
* buf
)
1286 struct super_block
*sb
= dentry
->d_sb
;
1287 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
1288 struct ext2_super_block
*es
= sbi
->s_es
;
1291 spin_lock(&sbi
->s_lock
);
1293 if (test_opt (sb
, MINIX_DF
))
1294 sbi
->s_overhead_last
= 0;
1295 else if (sbi
->s_blocks_last
!= le32_to_cpu(es
->s_blocks_count
)) {
1296 unsigned long i
, overhead
= 0;
1300 * Compute the overhead (FS structures). This is constant
1301 * for a given filesystem unless the number of block groups
1302 * changes so we cache the previous value until it does.
1306 * All of the blocks before first_data_block are
1309 overhead
= le32_to_cpu(es
->s_first_data_block
);
1312 * Add the overhead attributed to the superblock and
1313 * block group descriptors. If the sparse superblocks
1314 * feature is turned on, then not all groups have this.
1316 for (i
= 0; i
< sbi
->s_groups_count
; i
++)
1317 overhead
+= ext2_bg_has_super(sb
, i
) +
1318 ext2_bg_num_gdb(sb
, i
);
1321 * Every block group has an inode bitmap, a block
1322 * bitmap, and an inode table.
1324 overhead
+= (sbi
->s_groups_count
*
1325 (2 + sbi
->s_itb_per_group
));
1326 sbi
->s_overhead_last
= overhead
;
1328 sbi
->s_blocks_last
= le32_to_cpu(es
->s_blocks_count
);
1331 buf
->f_type
= EXT2_SUPER_MAGIC
;
1332 buf
->f_bsize
= sb
->s_blocksize
;
1333 buf
->f_blocks
= le32_to_cpu(es
->s_blocks_count
) - sbi
->s_overhead_last
;
1334 buf
->f_bfree
= ext2_count_free_blocks(sb
);
1335 es
->s_free_blocks_count
= cpu_to_le32(buf
->f_bfree
);
1336 buf
->f_bavail
= buf
->f_bfree
- le32_to_cpu(es
->s_r_blocks_count
);
1337 if (buf
->f_bfree
< le32_to_cpu(es
->s_r_blocks_count
))
1339 buf
->f_files
= le32_to_cpu(es
->s_inodes_count
);
1340 buf
->f_ffree
= ext2_count_free_inodes(sb
);
1341 es
->s_free_inodes_count
= cpu_to_le32(buf
->f_ffree
);
1342 buf
->f_namelen
= EXT2_NAME_LEN
;
1343 fsid
= le64_to_cpup((void *)es
->s_uuid
) ^
1344 le64_to_cpup((void *)es
->s_uuid
+ sizeof(u64
));
1345 buf
->f_fsid
.val
[0] = fsid
& 0xFFFFFFFFUL
;
1346 buf
->f_fsid
.val
[1] = (fsid
>> 32) & 0xFFFFFFFFUL
;
1347 spin_unlock(&sbi
->s_lock
);
1351 static int ext2_get_sb(struct file_system_type
*fs_type
,
1352 int flags
, const char *dev_name
, void *data
, struct vfsmount
*mnt
)
1354 return get_sb_bdev(fs_type
, flags
, dev_name
, data
, ext2_fill_super
, mnt
);
1359 /* Read data from quotafile - avoid pagecache and such because we cannot afford
1360 * acquiring the locks... As quota files are never truncated and quota code
1361 * itself serializes the operations (and noone else should touch the files)
1362 * we don't have to be afraid of races */
1363 static ssize_t
ext2_quota_read(struct super_block
*sb
, int type
, char *data
,
1364 size_t len
, loff_t off
)
1366 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
1367 sector_t blk
= off
>> EXT2_BLOCK_SIZE_BITS(sb
);
1369 int offset
= off
& (sb
->s_blocksize
- 1);
1372 struct buffer_head tmp_bh
;
1373 struct buffer_head
*bh
;
1374 loff_t i_size
= i_size_read(inode
);
1378 if (off
+len
> i_size
)
1381 while (toread
> 0) {
1382 tocopy
= sb
->s_blocksize
- offset
< toread
?
1383 sb
->s_blocksize
- offset
: toread
;
1386 tmp_bh
.b_size
= sb
->s_blocksize
;
1387 err
= ext2_get_block(inode
, blk
, &tmp_bh
, 0);
1390 if (!buffer_mapped(&tmp_bh
)) /* A hole? */
1391 memset(data
, 0, tocopy
);
1393 bh
= sb_bread(sb
, tmp_bh
.b_blocknr
);
1396 memcpy(data
, bh
->b_data
+offset
, tocopy
);
1407 /* Write to quotafile */
1408 static ssize_t
ext2_quota_write(struct super_block
*sb
, int type
,
1409 const char *data
, size_t len
, loff_t off
)
1411 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
1412 sector_t blk
= off
>> EXT2_BLOCK_SIZE_BITS(sb
);
1414 int offset
= off
& (sb
->s_blocksize
- 1);
1416 size_t towrite
= len
;
1417 struct buffer_head tmp_bh
;
1418 struct buffer_head
*bh
;
1420 mutex_lock_nested(&inode
->i_mutex
, I_MUTEX_QUOTA
);
1421 while (towrite
> 0) {
1422 tocopy
= sb
->s_blocksize
- offset
< towrite
?
1423 sb
->s_blocksize
- offset
: towrite
;
1426 err
= ext2_get_block(inode
, blk
, &tmp_bh
, 1);
1429 if (offset
|| tocopy
!= EXT2_BLOCK_SIZE(sb
))
1430 bh
= sb_bread(sb
, tmp_bh
.b_blocknr
);
1432 bh
= sb_getblk(sb
, tmp_bh
.b_blocknr
);
1438 memcpy(bh
->b_data
+offset
, data
, tocopy
);
1439 flush_dcache_page(bh
->b_page
);
1440 set_buffer_uptodate(bh
);
1441 mark_buffer_dirty(bh
);
1450 if (len
== towrite
) {
1451 mutex_unlock(&inode
->i_mutex
);
1454 if (inode
->i_size
< off
+len
-towrite
)
1455 i_size_write(inode
, off
+len
-towrite
);
1457 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
1458 mark_inode_dirty(inode
);
1459 mutex_unlock(&inode
->i_mutex
);
1460 return len
- towrite
;
1465 static struct file_system_type ext2_fs_type
= {
1466 .owner
= THIS_MODULE
,
1468 .get_sb
= ext2_get_sb
,
1469 .kill_sb
= kill_block_super
,
1470 .fs_flags
= FS_REQUIRES_DEV
,
1473 static int __init
init_ext2_fs(void)
1475 int err
= init_ext2_xattr();
1478 err
= init_inodecache();
1481 err
= register_filesystem(&ext2_fs_type
);
1486 destroy_inodecache();
1492 static void __exit
exit_ext2_fs(void)
1494 unregister_filesystem(&ext2_fs_type
);
1495 destroy_inodecache();
1499 module_init(init_ext2_fs
)
1500 module_exit(exit_ext2_fs
)