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/smp_lock.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 <asm/uaccess.h>
41 static void ext2_sync_super(struct super_block
*sb
,
42 struct ext2_super_block
*es
);
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
);
47 void ext2_error (struct super_block
* sb
, const char * function
,
48 const char * fmt
, ...)
51 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
52 struct ext2_super_block
*es
= sbi
->s_es
;
54 if (!(sb
->s_flags
& MS_RDONLY
)) {
55 sbi
->s_mount_state
|= EXT2_ERROR_FS
;
56 es
->s_state
|= cpu_to_le16(EXT2_ERROR_FS
);
57 ext2_sync_super(sb
, es
);
61 printk(KERN_CRIT
"EXT2-fs (%s): error: %s: ", sb
->s_id
, function
);
66 if (test_opt(sb
, ERRORS_PANIC
))
67 panic("EXT2-fs: panic from previous error\n");
68 if (test_opt(sb
, ERRORS_RO
)) {
69 ext2_msg(sb
, KERN_CRIT
,
70 "error: remounting filesystem read-only");
71 sb
->s_flags
|= MS_RDONLY
;
75 void ext2_msg(struct super_block
*sb
, const char *prefix
,
81 printk("%sEXT2-fs (%s): ", prefix
, sb
->s_id
);
87 void ext2_update_dynamic_rev(struct super_block
*sb
)
89 struct ext2_super_block
*es
= EXT2_SB(sb
)->s_es
;
91 if (le32_to_cpu(es
->s_rev_level
) > EXT2_GOOD_OLD_REV
)
94 ext2_msg(sb
, KERN_WARNING
,
95 "warning: updating to rev %d because of "
96 "new feature flag, running e2fsck is recommended",
99 es
->s_first_ino
= cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO
);
100 es
->s_inode_size
= cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE
);
101 es
->s_rev_level
= cpu_to_le32(EXT2_DYNAMIC_REV
);
102 /* leave es->s_feature_*compat flags alone */
103 /* es->s_uuid will be set by e2fsck if empty */
106 * The rest of the superblock fields should be zero, and if not it
107 * means they are likely already in use, so leave them alone. We
108 * can leave it up to e2fsck to clean up any inconsistencies there.
112 static void ext2_put_super (struct super_block
* sb
)
116 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
121 ext2_write_super(sb
);
123 ext2_xattr_put_super(sb
);
124 if (!(sb
->s_flags
& MS_RDONLY
)) {
125 struct ext2_super_block
*es
= sbi
->s_es
;
127 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
128 ext2_sync_super(sb
, es
);
130 db_count
= sbi
->s_gdb_count
;
131 for (i
= 0; i
< db_count
; i
++)
132 if (sbi
->s_group_desc
[i
])
133 brelse (sbi
->s_group_desc
[i
]);
134 kfree(sbi
->s_group_desc
);
136 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
137 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
138 percpu_counter_destroy(&sbi
->s_dirs_counter
);
140 sb
->s_fs_info
= NULL
;
141 kfree(sbi
->s_blockgroup_lock
);
147 static struct kmem_cache
* ext2_inode_cachep
;
149 static struct inode
*ext2_alloc_inode(struct super_block
*sb
)
151 struct ext2_inode_info
*ei
;
152 ei
= (struct ext2_inode_info
*)kmem_cache_alloc(ext2_inode_cachep
, GFP_KERNEL
);
155 ei
->i_block_alloc_info
= NULL
;
156 ei
->vfs_inode
.i_version
= 1;
157 return &ei
->vfs_inode
;
160 static void ext2_destroy_inode(struct inode
*inode
)
162 kmem_cache_free(ext2_inode_cachep
, EXT2_I(inode
));
165 static void init_once(void *foo
)
167 struct ext2_inode_info
*ei
= (struct ext2_inode_info
*) foo
;
169 rwlock_init(&ei
->i_meta_lock
);
170 #ifdef CONFIG_EXT2_FS_XATTR
171 init_rwsem(&ei
->xattr_sem
);
173 mutex_init(&ei
->truncate_mutex
);
174 inode_init_once(&ei
->vfs_inode
);
177 static int init_inodecache(void)
179 ext2_inode_cachep
= kmem_cache_create("ext2_inode_cache",
180 sizeof(struct ext2_inode_info
),
181 0, (SLAB_RECLAIM_ACCOUNT
|
184 if (ext2_inode_cachep
== NULL
)
189 static void destroy_inodecache(void)
191 kmem_cache_destroy(ext2_inode_cachep
);
194 static void ext2_clear_inode(struct inode
*inode
)
196 struct ext2_block_alloc_info
*rsv
= EXT2_I(inode
)->i_block_alloc_info
;
199 ext2_discard_reservation(inode
);
200 EXT2_I(inode
)->i_block_alloc_info
= NULL
;
205 static int ext2_show_options(struct seq_file
*seq
, struct vfsmount
*vfs
)
207 struct super_block
*sb
= vfs
->mnt_sb
;
208 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
209 struct ext2_super_block
*es
= sbi
->s_es
;
210 unsigned long def_mount_opts
;
212 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
214 if (sbi
->s_sb_block
!= 1)
215 seq_printf(seq
, ",sb=%lu", sbi
->s_sb_block
);
216 if (test_opt(sb
, MINIX_DF
))
217 seq_puts(seq
, ",minixdf");
218 if (test_opt(sb
, GRPID
))
219 seq_puts(seq
, ",grpid");
220 if (!test_opt(sb
, GRPID
) && (def_mount_opts
& EXT2_DEFM_BSDGROUPS
))
221 seq_puts(seq
, ",nogrpid");
222 if (sbi
->s_resuid
!= EXT2_DEF_RESUID
||
223 le16_to_cpu(es
->s_def_resuid
) != EXT2_DEF_RESUID
) {
224 seq_printf(seq
, ",resuid=%u", sbi
->s_resuid
);
226 if (sbi
->s_resgid
!= EXT2_DEF_RESGID
||
227 le16_to_cpu(es
->s_def_resgid
) != EXT2_DEF_RESGID
) {
228 seq_printf(seq
, ",resgid=%u", sbi
->s_resgid
);
230 if (test_opt(sb
, ERRORS_RO
)) {
231 int def_errors
= le16_to_cpu(es
->s_errors
);
233 if (def_errors
== EXT2_ERRORS_PANIC
||
234 def_errors
== EXT2_ERRORS_CONTINUE
) {
235 seq_puts(seq
, ",errors=remount-ro");
238 if (test_opt(sb
, ERRORS_CONT
))
239 seq_puts(seq
, ",errors=continue");
240 if (test_opt(sb
, ERRORS_PANIC
))
241 seq_puts(seq
, ",errors=panic");
242 if (test_opt(sb
, NO_UID32
))
243 seq_puts(seq
, ",nouid32");
244 if (test_opt(sb
, DEBUG
))
245 seq_puts(seq
, ",debug");
246 if (test_opt(sb
, OLDALLOC
))
247 seq_puts(seq
, ",oldalloc");
249 #ifdef CONFIG_EXT2_FS_XATTR
250 if (test_opt(sb
, XATTR_USER
))
251 seq_puts(seq
, ",user_xattr");
252 if (!test_opt(sb
, XATTR_USER
) &&
253 (def_mount_opts
& EXT2_DEFM_XATTR_USER
)) {
254 seq_puts(seq
, ",nouser_xattr");
258 #ifdef CONFIG_EXT2_FS_POSIX_ACL
259 if (test_opt(sb
, POSIX_ACL
))
260 seq_puts(seq
, ",acl");
261 if (!test_opt(sb
, POSIX_ACL
) && (def_mount_opts
& EXT2_DEFM_ACL
))
262 seq_puts(seq
, ",noacl");
265 if (test_opt(sb
, NOBH
))
266 seq_puts(seq
, ",nobh");
268 #if defined(CONFIG_QUOTA)
269 if (sbi
->s_mount_opt
& EXT2_MOUNT_USRQUOTA
)
270 seq_puts(seq
, ",usrquota");
272 if (sbi
->s_mount_opt
& EXT2_MOUNT_GRPQUOTA
)
273 seq_puts(seq
, ",grpquota");
276 #if defined(CONFIG_EXT2_FS_XIP)
277 if (sbi
->s_mount_opt
& EXT2_MOUNT_XIP
)
278 seq_puts(seq
, ",xip");
281 if (!test_opt(sb
, RESERVATION
))
282 seq_puts(seq
, ",noreservation");
288 static ssize_t
ext2_quota_read(struct super_block
*sb
, int type
, char *data
, size_t len
, loff_t off
);
289 static ssize_t
ext2_quota_write(struct super_block
*sb
, int type
, const char *data
, size_t len
, loff_t off
);
292 static const struct super_operations ext2_sops
= {
293 .alloc_inode
= ext2_alloc_inode
,
294 .destroy_inode
= ext2_destroy_inode
,
295 .write_inode
= ext2_write_inode
,
296 .delete_inode
= ext2_delete_inode
,
297 .put_super
= ext2_put_super
,
298 .write_super
= ext2_write_super
,
299 .sync_fs
= ext2_sync_fs
,
300 .statfs
= ext2_statfs
,
301 .remount_fs
= ext2_remount
,
302 .clear_inode
= ext2_clear_inode
,
303 .show_options
= ext2_show_options
,
305 .quota_read
= ext2_quota_read
,
306 .quota_write
= ext2_quota_write
,
310 static struct inode
*ext2_nfs_get_inode(struct super_block
*sb
,
311 u64 ino
, u32 generation
)
315 if (ino
< EXT2_FIRST_INO(sb
) && ino
!= EXT2_ROOT_INO
)
316 return ERR_PTR(-ESTALE
);
317 if (ino
> le32_to_cpu(EXT2_SB(sb
)->s_es
->s_inodes_count
))
318 return ERR_PTR(-ESTALE
);
320 /* iget isn't really right if the inode is currently unallocated!!
321 * ext2_read_inode currently does appropriate checks, but
322 * it might be "neater" to call ext2_get_inode first and check
323 * if the inode is valid.....
325 inode
= ext2_iget(sb
, ino
);
327 return ERR_CAST(inode
);
328 if (generation
&& inode
->i_generation
!= generation
) {
329 /* we didn't find the right inode.. */
331 return ERR_PTR(-ESTALE
);
336 static struct dentry
*ext2_fh_to_dentry(struct super_block
*sb
, struct fid
*fid
,
337 int fh_len
, int fh_type
)
339 return generic_fh_to_dentry(sb
, fid
, fh_len
, fh_type
,
343 static struct dentry
*ext2_fh_to_parent(struct super_block
*sb
, struct fid
*fid
,
344 int fh_len
, int fh_type
)
346 return generic_fh_to_parent(sb
, fid
, fh_len
, fh_type
,
350 /* Yes, most of these are left as NULL!!
351 * A NULL value implies the default, which works with ext2-like file
352 * systems, but can be improved upon.
353 * Currently only get_parent is required.
355 static const struct export_operations ext2_export_ops
= {
356 .fh_to_dentry
= ext2_fh_to_dentry
,
357 .fh_to_parent
= ext2_fh_to_parent
,
358 .get_parent
= ext2_get_parent
,
361 static unsigned long get_sb_block(void **data
)
363 unsigned long sb_block
;
364 char *options
= (char *) *data
;
366 if (!options
|| strncmp(options
, "sb=", 3) != 0)
367 return 1; /* Default location */
369 sb_block
= simple_strtoul(options
, &options
, 0);
370 if (*options
&& *options
!= ',') {
371 printk("EXT2-fs: Invalid sb specification: %s\n",
377 *data
= (void *) options
;
382 Opt_bsd_df
, Opt_minix_df
, Opt_grpid
, Opt_nogrpid
,
383 Opt_resgid
, Opt_resuid
, Opt_sb
, Opt_err_cont
, Opt_err_panic
,
384 Opt_err_ro
, Opt_nouid32
, Opt_nocheck
, Opt_debug
,
385 Opt_oldalloc
, Opt_orlov
, Opt_nobh
, Opt_user_xattr
, Opt_nouser_xattr
,
386 Opt_acl
, Opt_noacl
, Opt_xip
, Opt_ignore
, Opt_err
, Opt_quota
,
387 Opt_usrquota
, Opt_grpquota
, Opt_reservation
, Opt_noreservation
390 static const match_table_t tokens
= {
391 {Opt_bsd_df
, "bsddf"},
392 {Opt_minix_df
, "minixdf"},
393 {Opt_grpid
, "grpid"},
394 {Opt_grpid
, "bsdgroups"},
395 {Opt_nogrpid
, "nogrpid"},
396 {Opt_nogrpid
, "sysvgroups"},
397 {Opt_resgid
, "resgid=%u"},
398 {Opt_resuid
, "resuid=%u"},
400 {Opt_err_cont
, "errors=continue"},
401 {Opt_err_panic
, "errors=panic"},
402 {Opt_err_ro
, "errors=remount-ro"},
403 {Opt_nouid32
, "nouid32"},
404 {Opt_nocheck
, "check=none"},
405 {Opt_nocheck
, "nocheck"},
406 {Opt_debug
, "debug"},
407 {Opt_oldalloc
, "oldalloc"},
408 {Opt_orlov
, "orlov"},
410 {Opt_user_xattr
, "user_xattr"},
411 {Opt_nouser_xattr
, "nouser_xattr"},
413 {Opt_noacl
, "noacl"},
415 {Opt_grpquota
, "grpquota"},
416 {Opt_ignore
, "noquota"},
417 {Opt_quota
, "quota"},
418 {Opt_usrquota
, "usrquota"},
419 {Opt_reservation
, "reservation"},
420 {Opt_noreservation
, "noreservation"},
424 static int parse_options(char *options
, struct super_block
*sb
)
427 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
428 substring_t args
[MAX_OPT_ARGS
];
434 while ((p
= strsep (&options
, ",")) != NULL
) {
439 token
= match_token(p
, tokens
, args
);
442 clear_opt (sbi
->s_mount_opt
, MINIX_DF
);
445 set_opt (sbi
->s_mount_opt
, MINIX_DF
);
448 set_opt (sbi
->s_mount_opt
, GRPID
);
451 clear_opt (sbi
->s_mount_opt
, GRPID
);
454 if (match_int(&args
[0], &option
))
456 sbi
->s_resuid
= option
;
459 if (match_int(&args
[0], &option
))
461 sbi
->s_resgid
= option
;
464 /* handled by get_sb_block() instead of here */
465 /* *sb_block = match_int(&args[0]); */
468 clear_opt (sbi
->s_mount_opt
, ERRORS_CONT
);
469 clear_opt (sbi
->s_mount_opt
, ERRORS_RO
);
470 set_opt (sbi
->s_mount_opt
, ERRORS_PANIC
);
473 clear_opt (sbi
->s_mount_opt
, ERRORS_CONT
);
474 clear_opt (sbi
->s_mount_opt
, ERRORS_PANIC
);
475 set_opt (sbi
->s_mount_opt
, ERRORS_RO
);
478 clear_opt (sbi
->s_mount_opt
, ERRORS_RO
);
479 clear_opt (sbi
->s_mount_opt
, ERRORS_PANIC
);
480 set_opt (sbi
->s_mount_opt
, ERRORS_CONT
);
483 set_opt (sbi
->s_mount_opt
, NO_UID32
);
486 clear_opt (sbi
->s_mount_opt
, CHECK
);
489 set_opt (sbi
->s_mount_opt
, DEBUG
);
492 set_opt (sbi
->s_mount_opt
, OLDALLOC
);
495 clear_opt (sbi
->s_mount_opt
, OLDALLOC
);
498 set_opt (sbi
->s_mount_opt
, NOBH
);
500 #ifdef CONFIG_EXT2_FS_XATTR
502 set_opt (sbi
->s_mount_opt
, XATTR_USER
);
504 case Opt_nouser_xattr
:
505 clear_opt (sbi
->s_mount_opt
, XATTR_USER
);
509 case Opt_nouser_xattr
:
510 ext2_msg(sb
, KERN_INFO
, "(no)user_xattr options"
514 #ifdef CONFIG_EXT2_FS_POSIX_ACL
516 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
519 clear_opt(sbi
->s_mount_opt
, POSIX_ACL
);
524 ext2_msg(sb
, KERN_INFO
,
525 "(no)acl options not supported");
529 #ifdef CONFIG_EXT2_FS_XIP
530 set_opt (sbi
->s_mount_opt
, XIP
);
532 ext2_msg(sb
, KERN_INFO
, "xip option not supported");
536 #if defined(CONFIG_QUOTA)
539 set_opt(sbi
->s_mount_opt
, USRQUOTA
);
543 set_opt(sbi
->s_mount_opt
, GRPQUOTA
);
549 ext2_msg(sb
, KERN_INFO
,
550 "quota operations not supported");
554 case Opt_reservation
:
555 set_opt(sbi
->s_mount_opt
, RESERVATION
);
556 ext2_msg(sb
, KERN_INFO
, "reservations ON");
558 case Opt_noreservation
:
559 clear_opt(sbi
->s_mount_opt
, RESERVATION
);
560 ext2_msg(sb
, KERN_INFO
, "reservations OFF");
571 static int ext2_setup_super (struct super_block
* sb
,
572 struct ext2_super_block
* es
,
576 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
578 if (le32_to_cpu(es
->s_rev_level
) > EXT2_MAX_SUPP_REV
) {
579 ext2_msg(sb
, KERN_ERR
,
580 "error: revision level too high, "
581 "forcing read-only mode");
586 if (!(sbi
->s_mount_state
& EXT2_VALID_FS
))
587 ext2_msg(sb
, KERN_WARNING
,
588 "warning: mounting unchecked fs, "
589 "running e2fsck is recommended");
590 else if ((sbi
->s_mount_state
& EXT2_ERROR_FS
))
591 ext2_msg(sb
, KERN_WARNING
,
592 "warning: mounting fs with errors, "
593 "running e2fsck is recommended");
594 else if ((__s16
) le16_to_cpu(es
->s_max_mnt_count
) >= 0 &&
595 le16_to_cpu(es
->s_mnt_count
) >=
596 (unsigned short) (__s16
) le16_to_cpu(es
->s_max_mnt_count
))
597 ext2_msg(sb
, KERN_WARNING
,
598 "warning: maximal mount count reached, "
599 "running e2fsck is recommended");
600 else if (le32_to_cpu(es
->s_checkinterval
) &&
601 (le32_to_cpu(es
->s_lastcheck
) +
602 le32_to_cpu(es
->s_checkinterval
) <= get_seconds()))
603 ext2_msg(sb
, KERN_WARNING
,
604 "warning: checktime reached, "
605 "running e2fsck is recommended");
606 if (!le16_to_cpu(es
->s_max_mnt_count
))
607 es
->s_max_mnt_count
= cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT
);
608 le16_add_cpu(&es
->s_mnt_count
, 1);
609 ext2_write_super(sb
);
610 if (test_opt (sb
, DEBUG
))
611 ext2_msg(sb
, KERN_INFO
, "%s, %s, bs=%lu, fs=%lu, gc=%lu, "
612 "bpg=%lu, ipg=%lu, mo=%04lx]",
613 EXT2FS_VERSION
, EXT2FS_DATE
, sb
->s_blocksize
,
616 EXT2_BLOCKS_PER_GROUP(sb
),
617 EXT2_INODES_PER_GROUP(sb
),
622 static int ext2_check_descriptors(struct super_block
*sb
)
625 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
627 ext2_debug ("Checking group descriptors");
629 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
630 struct ext2_group_desc
*gdp
= ext2_get_group_desc(sb
, i
, NULL
);
631 ext2_fsblk_t first_block
= ext2_group_first_block_no(sb
, i
);
632 ext2_fsblk_t last_block
;
634 if (i
== sbi
->s_groups_count
- 1)
635 last_block
= le32_to_cpu(sbi
->s_es
->s_blocks_count
) - 1;
637 last_block
= first_block
+
638 (EXT2_BLOCKS_PER_GROUP(sb
) - 1);
640 if (le32_to_cpu(gdp
->bg_block_bitmap
) < first_block
||
641 le32_to_cpu(gdp
->bg_block_bitmap
) > last_block
)
643 ext2_error (sb
, "ext2_check_descriptors",
644 "Block bitmap for group %d"
645 " not in group (block %lu)!",
646 i
, (unsigned long) le32_to_cpu(gdp
->bg_block_bitmap
));
649 if (le32_to_cpu(gdp
->bg_inode_bitmap
) < first_block
||
650 le32_to_cpu(gdp
->bg_inode_bitmap
) > last_block
)
652 ext2_error (sb
, "ext2_check_descriptors",
653 "Inode bitmap for group %d"
654 " not in group (block %lu)!",
655 i
, (unsigned long) le32_to_cpu(gdp
->bg_inode_bitmap
));
658 if (le32_to_cpu(gdp
->bg_inode_table
) < first_block
||
659 le32_to_cpu(gdp
->bg_inode_table
) + sbi
->s_itb_per_group
- 1 >
662 ext2_error (sb
, "ext2_check_descriptors",
663 "Inode table for group %d"
664 " not in group (block %lu)!",
665 i
, (unsigned long) le32_to_cpu(gdp
->bg_inode_table
));
673 * Maximal file size. There is a direct, and {,double-,triple-}indirect
674 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
675 * We need to be 1 filesystem block less than the 2^32 sector limit.
677 static loff_t
ext2_max_size(int bits
)
679 loff_t res
= EXT2_NDIR_BLOCKS
;
683 /* This is calculated to be the largest file size for a
684 * dense, file such that the total number of
685 * sectors in the file, including data and all indirect blocks,
686 * does not exceed 2^32 -1
687 * __u32 i_blocks representing the total number of
688 * 512 bytes blocks of the file
690 upper_limit
= (1LL << 32) - 1;
692 /* total blocks in file system block size */
693 upper_limit
>>= (bits
- 9);
696 /* indirect blocks */
698 /* double indirect blocks */
699 meta_blocks
+= 1 + (1LL << (bits
-2));
700 /* tripple indirect blocks */
701 meta_blocks
+= 1 + (1LL << (bits
-2)) + (1LL << (2*(bits
-2)));
703 upper_limit
-= meta_blocks
;
704 upper_limit
<<= bits
;
706 res
+= 1LL << (bits
-2);
707 res
+= 1LL << (2*(bits
-2));
708 res
+= 1LL << (3*(bits
-2));
710 if (res
> upper_limit
)
713 if (res
> MAX_LFS_FILESIZE
)
714 res
= MAX_LFS_FILESIZE
;
719 static unsigned long descriptor_loc(struct super_block
*sb
,
720 unsigned long logic_sb_block
,
723 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
724 unsigned long bg
, first_meta_bg
;
727 first_meta_bg
= le32_to_cpu(sbi
->s_es
->s_first_meta_bg
);
729 if (!EXT2_HAS_INCOMPAT_FEATURE(sb
, EXT2_FEATURE_INCOMPAT_META_BG
) ||
731 return (logic_sb_block
+ nr
+ 1);
732 bg
= sbi
->s_desc_per_block
* nr
;
733 if (ext2_bg_has_super(sb
, bg
))
736 return ext2_group_first_block_no(sb
, bg
) + has_super
;
739 static int ext2_fill_super(struct super_block
*sb
, void *data
, int silent
)
741 struct buffer_head
* bh
;
742 struct ext2_sb_info
* sbi
;
743 struct ext2_super_block
* es
;
746 unsigned long sb_block
= get_sb_block(&data
);
747 unsigned long logic_sb_block
;
748 unsigned long offset
= 0;
749 unsigned long def_mount_opts
;
751 int blocksize
= BLOCK_SIZE
;
757 sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
761 sbi
->s_blockgroup_lock
=
762 kzalloc(sizeof(struct blockgroup_lock
), GFP_KERNEL
);
763 if (!sbi
->s_blockgroup_lock
) {
768 sbi
->s_sb_block
= sb_block
;
771 * See what the current blocksize for the device is, and
772 * use that as the blocksize. Otherwise (or if the blocksize
773 * is smaller than the default) use the default.
774 * This is important for devices that have a hardware
775 * sectorsize that is larger than the default.
777 blocksize
= sb_min_blocksize(sb
, BLOCK_SIZE
);
779 ext2_msg(sb
, KERN_ERR
, "error: unable to set blocksize");
784 * If the superblock doesn't start on a hardware sector boundary,
785 * calculate the offset.
787 if (blocksize
!= BLOCK_SIZE
) {
788 logic_sb_block
= (sb_block
*BLOCK_SIZE
) / blocksize
;
789 offset
= (sb_block
*BLOCK_SIZE
) % blocksize
;
791 logic_sb_block
= sb_block
;
794 if (!(bh
= sb_bread(sb
, logic_sb_block
))) {
795 ext2_msg(sb
, KERN_ERR
, "error: unable to read superblock");
799 * Note: s_es must be initialized as soon as possible because
800 * some ext2 macro-instructions depend on its value
802 es
= (struct ext2_super_block
*) (((char *)bh
->b_data
) + offset
);
804 sb
->s_magic
= le16_to_cpu(es
->s_magic
);
806 if (sb
->s_magic
!= EXT2_SUPER_MAGIC
)
809 /* Set defaults before we parse the mount options */
810 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
811 if (def_mount_opts
& EXT2_DEFM_DEBUG
)
812 set_opt(sbi
->s_mount_opt
, DEBUG
);
813 if (def_mount_opts
& EXT2_DEFM_BSDGROUPS
)
814 set_opt(sbi
->s_mount_opt
, GRPID
);
815 if (def_mount_opts
& EXT2_DEFM_UID16
)
816 set_opt(sbi
->s_mount_opt
, NO_UID32
);
817 #ifdef CONFIG_EXT2_FS_XATTR
818 if (def_mount_opts
& EXT2_DEFM_XATTR_USER
)
819 set_opt(sbi
->s_mount_opt
, XATTR_USER
);
821 #ifdef CONFIG_EXT2_FS_POSIX_ACL
822 if (def_mount_opts
& EXT2_DEFM_ACL
)
823 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
826 if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT2_ERRORS_PANIC
)
827 set_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
828 else if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT2_ERRORS_CONTINUE
)
829 set_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
831 set_opt(sbi
->s_mount_opt
, ERRORS_RO
);
833 sbi
->s_resuid
= le16_to_cpu(es
->s_def_resuid
);
834 sbi
->s_resgid
= le16_to_cpu(es
->s_def_resgid
);
836 set_opt(sbi
->s_mount_opt
, RESERVATION
);
838 if (!parse_options((char *) data
, sb
))
841 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
842 ((EXT2_SB(sb
)->s_mount_opt
& EXT2_MOUNT_POSIX_ACL
) ?
845 ext2_xip_verify_sb(sb
); /* see if bdev supports xip, unset
846 EXT2_MOUNT_XIP if not */
848 if (le32_to_cpu(es
->s_rev_level
) == EXT2_GOOD_OLD_REV
&&
849 (EXT2_HAS_COMPAT_FEATURE(sb
, ~0U) ||
850 EXT2_HAS_RO_COMPAT_FEATURE(sb
, ~0U) ||
851 EXT2_HAS_INCOMPAT_FEATURE(sb
, ~0U)))
852 ext2_msg(sb
, KERN_WARNING
,
853 "warning: feature flags set on rev 0 fs, "
854 "running e2fsck is recommended");
856 * Check feature flags regardless of the revision level, since we
857 * previously didn't change the revision level when setting the flags,
858 * so there is a chance incompat flags are set on a rev 0 filesystem.
860 features
= EXT2_HAS_INCOMPAT_FEATURE(sb
, ~EXT2_FEATURE_INCOMPAT_SUPP
);
862 ext2_msg(sb
, KERN_ERR
, "error: couldn't mount because of "
863 "unsupported optional features (%x)",
864 le32_to_cpu(features
));
867 if (!(sb
->s_flags
& MS_RDONLY
) &&
868 (features
= EXT2_HAS_RO_COMPAT_FEATURE(sb
, ~EXT2_FEATURE_RO_COMPAT_SUPP
))){
869 ext2_msg(sb
, KERN_ERR
, "error: couldn't mount RDWR because of "
870 "unsupported optional features (%x)",
871 le32_to_cpu(features
));
875 blocksize
= BLOCK_SIZE
<< le32_to_cpu(sbi
->s_es
->s_log_block_size
);
877 if (ext2_use_xip(sb
) && blocksize
!= PAGE_SIZE
) {
879 ext2_msg(sb
, KERN_ERR
,
880 "error: unsupported blocksize for xip");
884 /* If the blocksize doesn't match, re-read the thing.. */
885 if (sb
->s_blocksize
!= blocksize
) {
888 if (!sb_set_blocksize(sb
, blocksize
)) {
889 ext2_msg(sb
, KERN_ERR
, "error: blocksize is too small");
893 logic_sb_block
= (sb_block
*BLOCK_SIZE
) / blocksize
;
894 offset
= (sb_block
*BLOCK_SIZE
) % blocksize
;
895 bh
= sb_bread(sb
, logic_sb_block
);
897 ext2_msg(sb
, KERN_ERR
, "error: couldn't read"
898 "superblock on 2nd try");
901 es
= (struct ext2_super_block
*) (((char *)bh
->b_data
) + offset
);
903 if (es
->s_magic
!= cpu_to_le16(EXT2_SUPER_MAGIC
)) {
904 ext2_msg(sb
, KERN_ERR
, "error: magic mismatch");
909 sb
->s_maxbytes
= ext2_max_size(sb
->s_blocksize_bits
);
911 if (le32_to_cpu(es
->s_rev_level
) == EXT2_GOOD_OLD_REV
) {
912 sbi
->s_inode_size
= EXT2_GOOD_OLD_INODE_SIZE
;
913 sbi
->s_first_ino
= EXT2_GOOD_OLD_FIRST_INO
;
915 sbi
->s_inode_size
= le16_to_cpu(es
->s_inode_size
);
916 sbi
->s_first_ino
= le32_to_cpu(es
->s_first_ino
);
917 if ((sbi
->s_inode_size
< EXT2_GOOD_OLD_INODE_SIZE
) ||
918 !is_power_of_2(sbi
->s_inode_size
) ||
919 (sbi
->s_inode_size
> blocksize
)) {
920 ext2_msg(sb
, KERN_ERR
,
921 "error: unsupported inode size: %d",
927 sbi
->s_frag_size
= EXT2_MIN_FRAG_SIZE
<<
928 le32_to_cpu(es
->s_log_frag_size
);
929 if (sbi
->s_frag_size
== 0)
931 sbi
->s_frags_per_block
= sb
->s_blocksize
/ sbi
->s_frag_size
;
933 sbi
->s_blocks_per_group
= le32_to_cpu(es
->s_blocks_per_group
);
934 sbi
->s_frags_per_group
= le32_to_cpu(es
->s_frags_per_group
);
935 sbi
->s_inodes_per_group
= le32_to_cpu(es
->s_inodes_per_group
);
937 if (EXT2_INODE_SIZE(sb
) == 0)
939 sbi
->s_inodes_per_block
= sb
->s_blocksize
/ EXT2_INODE_SIZE(sb
);
940 if (sbi
->s_inodes_per_block
== 0 || sbi
->s_inodes_per_group
== 0)
942 sbi
->s_itb_per_group
= sbi
->s_inodes_per_group
/
943 sbi
->s_inodes_per_block
;
944 sbi
->s_desc_per_block
= sb
->s_blocksize
/
945 sizeof (struct ext2_group_desc
);
947 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
948 sbi
->s_addr_per_block_bits
=
949 ilog2 (EXT2_ADDR_PER_BLOCK(sb
));
950 sbi
->s_desc_per_block_bits
=
951 ilog2 (EXT2_DESC_PER_BLOCK(sb
));
953 if (sb
->s_magic
!= EXT2_SUPER_MAGIC
)
956 if (sb
->s_blocksize
!= bh
->b_size
) {
958 ext2_msg(sb
, KERN_ERR
, "error: unsupported blocksize");
962 if (sb
->s_blocksize
!= sbi
->s_frag_size
) {
963 ext2_msg(sb
, KERN_ERR
,
964 "error: fragsize %lu != blocksize %lu"
965 "(not supported yet)",
966 sbi
->s_frag_size
, sb
->s_blocksize
);
970 if (sbi
->s_blocks_per_group
> sb
->s_blocksize
* 8) {
971 ext2_msg(sb
, KERN_ERR
,
972 "error: #blocks per group too big: %lu",
973 sbi
->s_blocks_per_group
);
976 if (sbi
->s_frags_per_group
> sb
->s_blocksize
* 8) {
977 ext2_msg(sb
, KERN_ERR
,
978 "error: #fragments per group too big: %lu",
979 sbi
->s_frags_per_group
);
982 if (sbi
->s_inodes_per_group
> sb
->s_blocksize
* 8) {
983 ext2_msg(sb
, KERN_ERR
,
984 "error: #inodes per group too big: %lu",
985 sbi
->s_inodes_per_group
);
989 if (EXT2_BLOCKS_PER_GROUP(sb
) == 0)
991 sbi
->s_groups_count
= ((le32_to_cpu(es
->s_blocks_count
) -
992 le32_to_cpu(es
->s_first_data_block
) - 1)
993 / EXT2_BLOCKS_PER_GROUP(sb
)) + 1;
994 db_count
= (sbi
->s_groups_count
+ EXT2_DESC_PER_BLOCK(sb
) - 1) /
995 EXT2_DESC_PER_BLOCK(sb
);
996 sbi
->s_group_desc
= kmalloc (db_count
* sizeof (struct buffer_head
*), GFP_KERNEL
);
997 if (sbi
->s_group_desc
== NULL
) {
998 ext2_msg(sb
, KERN_ERR
, "error: not enough memory");
1001 bgl_lock_init(sbi
->s_blockgroup_lock
);
1002 sbi
->s_debts
= kcalloc(sbi
->s_groups_count
, sizeof(*sbi
->s_debts
), GFP_KERNEL
);
1003 if (!sbi
->s_debts
) {
1004 ext2_msg(sb
, KERN_ERR
, "error: not enough memory");
1005 goto failed_mount_group_desc
;
1007 for (i
= 0; i
< db_count
; i
++) {
1008 block
= descriptor_loc(sb
, logic_sb_block
, i
);
1009 sbi
->s_group_desc
[i
] = sb_bread(sb
, block
);
1010 if (!sbi
->s_group_desc
[i
]) {
1011 for (j
= 0; j
< i
; j
++)
1012 brelse (sbi
->s_group_desc
[j
]);
1013 ext2_msg(sb
, KERN_ERR
,
1014 "error: unable to read group descriptors");
1015 goto failed_mount_group_desc
;
1018 if (!ext2_check_descriptors (sb
)) {
1019 ext2_msg(sb
, KERN_ERR
, "group descriptors corrupted");
1022 sbi
->s_gdb_count
= db_count
;
1023 get_random_bytes(&sbi
->s_next_generation
, sizeof(u32
));
1024 spin_lock_init(&sbi
->s_next_gen_lock
);
1026 /* per fileystem reservation list head & lock */
1027 spin_lock_init(&sbi
->s_rsv_window_lock
);
1028 sbi
->s_rsv_window_root
= RB_ROOT
;
1030 * Add a single, static dummy reservation to the start of the
1031 * reservation window list --- it gives us a placeholder for
1032 * append-at-start-of-list which makes the allocation logic
1035 sbi
->s_rsv_window_head
.rsv_start
= EXT2_RESERVE_WINDOW_NOT_ALLOCATED
;
1036 sbi
->s_rsv_window_head
.rsv_end
= EXT2_RESERVE_WINDOW_NOT_ALLOCATED
;
1037 sbi
->s_rsv_window_head
.rsv_alloc_hit
= 0;
1038 sbi
->s_rsv_window_head
.rsv_goal_size
= 0;
1039 ext2_rsv_window_add(sb
, &sbi
->s_rsv_window_head
);
1041 err
= percpu_counter_init(&sbi
->s_freeblocks_counter
,
1042 ext2_count_free_blocks(sb
));
1044 err
= percpu_counter_init(&sbi
->s_freeinodes_counter
,
1045 ext2_count_free_inodes(sb
));
1048 err
= percpu_counter_init(&sbi
->s_dirs_counter
,
1049 ext2_count_dirs(sb
));
1052 ext2_msg(sb
, KERN_ERR
, "error: insufficient memory");
1056 * set up enough so that it can read an inode
1058 sb
->s_op
= &ext2_sops
;
1059 sb
->s_export_op
= &ext2_export_ops
;
1060 sb
->s_xattr
= ext2_xattr_handlers
;
1061 root
= ext2_iget(sb
, EXT2_ROOT_INO
);
1063 ret
= PTR_ERR(root
);
1066 if (!S_ISDIR(root
->i_mode
) || !root
->i_blocks
|| !root
->i_size
) {
1068 ext2_msg(sb
, KERN_ERR
, "error: corrupt root inode, run e2fsck");
1072 sb
->s_root
= d_alloc_root(root
);
1075 ext2_msg(sb
, KERN_ERR
, "error: get root inode failed");
1079 if (EXT2_HAS_COMPAT_FEATURE(sb
, EXT3_FEATURE_COMPAT_HAS_JOURNAL
))
1080 ext2_msg(sb
, KERN_WARNING
,
1081 "warning: mounting ext3 filesystem as ext2");
1082 ext2_setup_super (sb
, es
, sb
->s_flags
& MS_RDONLY
);
1087 ext2_msg(sb
, KERN_ERR
,
1088 "error: can't find an ext2 filesystem on dev %s.",
1092 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
1093 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
1094 percpu_counter_destroy(&sbi
->s_dirs_counter
);
1096 for (i
= 0; i
< db_count
; i
++)
1097 brelse(sbi
->s_group_desc
[i
]);
1098 failed_mount_group_desc
:
1099 kfree(sbi
->s_group_desc
);
1100 kfree(sbi
->s_debts
);
1104 sb
->s_fs_info
= NULL
;
1105 kfree(sbi
->s_blockgroup_lock
);
1110 static void ext2_clear_super_error(struct super_block
*sb
)
1112 struct buffer_head
*sbh
= EXT2_SB(sb
)->s_sbh
;
1114 if (buffer_write_io_error(sbh
)) {
1116 * Oh, dear. A previous attempt to write the
1117 * superblock failed. This could happen because the
1118 * USB device was yanked out. Or it could happen to
1119 * be a transient write error and maybe the block will
1120 * be remapped. Nothing we can do but to retry the
1121 * write and hope for the best.
1123 printk(KERN_ERR
"EXT2-fs: %s previous I/O error to "
1124 "superblock detected", sb
->s_id
);
1125 clear_buffer_write_io_error(sbh
);
1126 set_buffer_uptodate(sbh
);
1130 static void ext2_commit_super (struct super_block
* sb
,
1131 struct ext2_super_block
* es
)
1133 ext2_clear_super_error(sb
);
1134 es
->s_wtime
= cpu_to_le32(get_seconds());
1135 mark_buffer_dirty(EXT2_SB(sb
)->s_sbh
);
1139 static void ext2_sync_super(struct super_block
*sb
, struct ext2_super_block
*es
)
1141 ext2_clear_super_error(sb
);
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 mark_buffer_dirty(EXT2_SB(sb
)->s_sbh
);
1146 sync_dirty_buffer(EXT2_SB(sb
)->s_sbh
);
1151 * In the second extended file system, it is not necessary to
1152 * write the super block since we use a mapping of the
1153 * disk super block in a buffer.
1155 * However, this function is still used to set the fs valid
1156 * flags to 0. We need to set this flag to 0 since the fs
1157 * may have been checked while mounted and e2fsck may have
1158 * set s_state to EXT2_VALID_FS after some corrections.
1161 static int ext2_sync_fs(struct super_block
*sb
, int wait
)
1163 struct ext2_super_block
*es
= EXT2_SB(sb
)->s_es
;
1164 struct buffer_head
*sbh
= EXT2_SB(sb
)->s_sbh
;
1167 if (buffer_write_io_error(sbh
)) {
1169 * Oh, dear. A previous attempt to write the
1170 * superblock failed. This could happen because the
1171 * USB device was yanked out. Or it could happen to
1172 * be a transient write error and maybe the block will
1173 * be remapped. Nothing we can do but to retry the
1174 * write and hope for the best.
1176 ext2_msg(sb
, KERN_ERR
,
1177 "previous I/O error to superblock detected\n");
1178 clear_buffer_write_io_error(sbh
);
1179 set_buffer_uptodate(sbh
);
1182 if (es
->s_state
& cpu_to_le16(EXT2_VALID_FS
)) {
1183 ext2_debug("setting valid to 0\n");
1184 es
->s_state
&= cpu_to_le16(~EXT2_VALID_FS
);
1185 es
->s_free_blocks_count
=
1186 cpu_to_le32(ext2_count_free_blocks(sb
));
1187 es
->s_free_inodes_count
=
1188 cpu_to_le32(ext2_count_free_inodes(sb
));
1189 es
->s_mtime
= cpu_to_le32(get_seconds());
1190 ext2_sync_super(sb
, es
);
1192 ext2_commit_super(sb
, es
);
1201 void ext2_write_super(struct super_block
*sb
)
1203 if (!(sb
->s_flags
& MS_RDONLY
))
1204 ext2_sync_fs(sb
, 1);
1209 static int ext2_remount (struct super_block
* sb
, int * flags
, char * data
)
1211 struct ext2_sb_info
* sbi
= EXT2_SB(sb
);
1212 struct ext2_super_block
* es
;
1213 unsigned long old_mount_opt
= sbi
->s_mount_opt
;
1214 struct ext2_mount_options old_opts
;
1215 unsigned long old_sb_flags
;
1220 /* Store the old options */
1221 old_sb_flags
= sb
->s_flags
;
1222 old_opts
.s_mount_opt
= sbi
->s_mount_opt
;
1223 old_opts
.s_resuid
= sbi
->s_resuid
;
1224 old_opts
.s_resgid
= sbi
->s_resgid
;
1227 * Allow the "check" option to be passed as a remount option.
1229 if (!parse_options(data
, sb
)) {
1234 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
1235 ((sbi
->s_mount_opt
& EXT2_MOUNT_POSIX_ACL
) ? MS_POSIXACL
: 0);
1237 ext2_xip_verify_sb(sb
); /* see if bdev supports xip, unset
1238 EXT2_MOUNT_XIP if not */
1240 if ((ext2_use_xip(sb
)) && (sb
->s_blocksize
!= PAGE_SIZE
)) {
1241 ext2_msg(sb
, KERN_WARNING
,
1242 "warning: unsupported blocksize for xip");
1248 if (((sbi
->s_mount_opt
& EXT2_MOUNT_XIP
) !=
1249 (old_mount_opt
& EXT2_MOUNT_XIP
)) &&
1250 invalidate_inodes(sb
)) {
1251 ext2_msg(sb
, KERN_WARNING
, "warning: refusing change of "
1252 "xip flag with busy inodes while remounting");
1253 sbi
->s_mount_opt
&= ~EXT2_MOUNT_XIP
;
1254 sbi
->s_mount_opt
|= old_mount_opt
& EXT2_MOUNT_XIP
;
1256 if ((*flags
& MS_RDONLY
) == (sb
->s_flags
& MS_RDONLY
)) {
1260 if (*flags
& MS_RDONLY
) {
1261 if (le16_to_cpu(es
->s_state
) & EXT2_VALID_FS
||
1262 !(sbi
->s_mount_state
& EXT2_VALID_FS
)) {
1267 * OK, we are remounting a valid rw partition rdonly, so set
1268 * the rdonly flag and then mark the partition as valid again.
1270 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
1271 es
->s_mtime
= cpu_to_le32(get_seconds());
1273 __le32 ret
= EXT2_HAS_RO_COMPAT_FEATURE(sb
,
1274 ~EXT2_FEATURE_RO_COMPAT_SUPP
);
1276 ext2_msg(sb
, KERN_WARNING
,
1277 "warning: couldn't remount RDWR because of "
1278 "unsupported optional features (%x).",
1284 * Mounting a RDONLY partition read-write, so reread and
1285 * store the current valid flag. (It may have been changed
1286 * by e2fsck since we originally mounted the partition.)
1288 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
1289 if (!ext2_setup_super (sb
, es
, 0))
1290 sb
->s_flags
&= ~MS_RDONLY
;
1292 ext2_sync_super(sb
, es
);
1296 sbi
->s_mount_opt
= old_opts
.s_mount_opt
;
1297 sbi
->s_resuid
= old_opts
.s_resuid
;
1298 sbi
->s_resgid
= old_opts
.s_resgid
;
1299 sb
->s_flags
= old_sb_flags
;
1304 static int ext2_statfs (struct dentry
* dentry
, struct kstatfs
* buf
)
1306 struct super_block
*sb
= dentry
->d_sb
;
1307 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
1308 struct ext2_super_block
*es
= sbi
->s_es
;
1311 if (test_opt (sb
, MINIX_DF
))
1312 sbi
->s_overhead_last
= 0;
1313 else if (sbi
->s_blocks_last
!= le32_to_cpu(es
->s_blocks_count
)) {
1314 unsigned long i
, overhead
= 0;
1318 * Compute the overhead (FS structures). This is constant
1319 * for a given filesystem unless the number of block groups
1320 * changes so we cache the previous value until it does.
1324 * All of the blocks before first_data_block are
1327 overhead
= le32_to_cpu(es
->s_first_data_block
);
1330 * Add the overhead attributed to the superblock and
1331 * block group descriptors. If the sparse superblocks
1332 * feature is turned on, then not all groups have this.
1334 for (i
= 0; i
< sbi
->s_groups_count
; i
++)
1335 overhead
+= ext2_bg_has_super(sb
, i
) +
1336 ext2_bg_num_gdb(sb
, i
);
1339 * Every block group has an inode bitmap, a block
1340 * bitmap, and an inode table.
1342 overhead
+= (sbi
->s_groups_count
*
1343 (2 + sbi
->s_itb_per_group
));
1344 sbi
->s_overhead_last
= overhead
;
1346 sbi
->s_blocks_last
= le32_to_cpu(es
->s_blocks_count
);
1349 buf
->f_type
= EXT2_SUPER_MAGIC
;
1350 buf
->f_bsize
= sb
->s_blocksize
;
1351 buf
->f_blocks
= le32_to_cpu(es
->s_blocks_count
) - sbi
->s_overhead_last
;
1352 buf
->f_bfree
= ext2_count_free_blocks(sb
);
1353 es
->s_free_blocks_count
= cpu_to_le32(buf
->f_bfree
);
1354 buf
->f_bavail
= buf
->f_bfree
- le32_to_cpu(es
->s_r_blocks_count
);
1355 if (buf
->f_bfree
< le32_to_cpu(es
->s_r_blocks_count
))
1357 buf
->f_files
= le32_to_cpu(es
->s_inodes_count
);
1358 buf
->f_ffree
= ext2_count_free_inodes(sb
);
1359 es
->s_free_inodes_count
= cpu_to_le32(buf
->f_ffree
);
1360 buf
->f_namelen
= EXT2_NAME_LEN
;
1361 fsid
= le64_to_cpup((void *)es
->s_uuid
) ^
1362 le64_to_cpup((void *)es
->s_uuid
+ sizeof(u64
));
1363 buf
->f_fsid
.val
[0] = fsid
& 0xFFFFFFFFUL
;
1364 buf
->f_fsid
.val
[1] = (fsid
>> 32) & 0xFFFFFFFFUL
;
1368 static int ext2_get_sb(struct file_system_type
*fs_type
,
1369 int flags
, const char *dev_name
, void *data
, struct vfsmount
*mnt
)
1371 return get_sb_bdev(fs_type
, flags
, dev_name
, data
, ext2_fill_super
, mnt
);
1376 /* Read data from quotafile - avoid pagecache and such because we cannot afford
1377 * acquiring the locks... As quota files are never truncated and quota code
1378 * itself serializes the operations (and noone else should touch the files)
1379 * we don't have to be afraid of races */
1380 static ssize_t
ext2_quota_read(struct super_block
*sb
, int type
, char *data
,
1381 size_t len
, loff_t off
)
1383 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
1384 sector_t blk
= off
>> EXT2_BLOCK_SIZE_BITS(sb
);
1386 int offset
= off
& (sb
->s_blocksize
- 1);
1389 struct buffer_head tmp_bh
;
1390 struct buffer_head
*bh
;
1391 loff_t i_size
= i_size_read(inode
);
1395 if (off
+len
> i_size
)
1398 while (toread
> 0) {
1399 tocopy
= sb
->s_blocksize
- offset
< toread
?
1400 sb
->s_blocksize
- offset
: toread
;
1403 tmp_bh
.b_size
= sb
->s_blocksize
;
1404 err
= ext2_get_block(inode
, blk
, &tmp_bh
, 0);
1407 if (!buffer_mapped(&tmp_bh
)) /* A hole? */
1408 memset(data
, 0, tocopy
);
1410 bh
= sb_bread(sb
, tmp_bh
.b_blocknr
);
1413 memcpy(data
, bh
->b_data
+offset
, tocopy
);
1424 /* Write to quotafile */
1425 static ssize_t
ext2_quota_write(struct super_block
*sb
, int type
,
1426 const char *data
, size_t len
, loff_t off
)
1428 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
1429 sector_t blk
= off
>> EXT2_BLOCK_SIZE_BITS(sb
);
1431 int offset
= off
& (sb
->s_blocksize
- 1);
1433 size_t towrite
= len
;
1434 struct buffer_head tmp_bh
;
1435 struct buffer_head
*bh
;
1437 mutex_lock_nested(&inode
->i_mutex
, I_MUTEX_QUOTA
);
1438 while (towrite
> 0) {
1439 tocopy
= sb
->s_blocksize
- offset
< towrite
?
1440 sb
->s_blocksize
- offset
: towrite
;
1443 err
= ext2_get_block(inode
, blk
, &tmp_bh
, 1);
1446 if (offset
|| tocopy
!= EXT2_BLOCK_SIZE(sb
))
1447 bh
= sb_bread(sb
, tmp_bh
.b_blocknr
);
1449 bh
= sb_getblk(sb
, tmp_bh
.b_blocknr
);
1455 memcpy(bh
->b_data
+offset
, data
, tocopy
);
1456 flush_dcache_page(bh
->b_page
);
1457 set_buffer_uptodate(bh
);
1458 mark_buffer_dirty(bh
);
1467 if (len
== towrite
) {
1468 mutex_unlock(&inode
->i_mutex
);
1471 if (inode
->i_size
< off
+len
-towrite
)
1472 i_size_write(inode
, off
+len
-towrite
);
1474 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
1475 mark_inode_dirty(inode
);
1476 mutex_unlock(&inode
->i_mutex
);
1477 return len
- towrite
;
1482 static struct file_system_type ext2_fs_type
= {
1483 .owner
= THIS_MODULE
,
1485 .get_sb
= ext2_get_sb
,
1486 .kill_sb
= kill_block_super
,
1487 .fs_flags
= FS_REQUIRES_DEV
,
1490 static int __init
init_ext2_fs(void)
1492 int err
= init_ext2_xattr();
1495 err
= init_inodecache();
1498 err
= register_filesystem(&ext2_fs_type
);
1503 destroy_inodecache();
1509 static void __exit
exit_ext2_fs(void)
1511 unregister_filesystem(&ext2_fs_type
);
1512 destroy_inodecache();
1516 module_init(init_ext2_fs
)
1517 module_exit(exit_ext2_fs
)