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/config.h>
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/smp_lock.h>
30 #include <linux/vfs.h>
31 #include <linux/seq_file.h>
32 #include <linux/mount.h>
33 #include <asm/uaccess.h>
39 static void ext2_sync_super(struct super_block
*sb
,
40 struct ext2_super_block
*es
);
41 static int ext2_remount (struct super_block
* sb
, int * flags
, char * data
);
42 static int ext2_statfs (struct super_block
* sb
, struct kstatfs
* buf
);
44 void ext2_error (struct super_block
* sb
, const char * function
,
45 const char * fmt
, ...)
48 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
49 struct ext2_super_block
*es
= sbi
->s_es
;
51 if (!(sb
->s_flags
& MS_RDONLY
)) {
52 sbi
->s_mount_state
|= EXT2_ERROR_FS
;
54 cpu_to_le16(le16_to_cpu(es
->s_state
) | EXT2_ERROR_FS
);
55 ext2_sync_super(sb
, es
);
59 printk(KERN_CRIT
"EXT2-fs error (device %s): %s: ",sb
->s_id
, function
);
64 if (test_opt(sb
, ERRORS_PANIC
))
65 panic("EXT2-fs panic from previous error\n");
66 if (test_opt(sb
, ERRORS_RO
)) {
67 printk("Remounting filesystem read-only\n");
68 sb
->s_flags
|= MS_RDONLY
;
72 void ext2_warning (struct super_block
* sb
, const char * function
,
73 const char * fmt
, ...)
78 printk(KERN_WARNING
"EXT2-fs warning (device %s): %s: ",
85 void ext2_update_dynamic_rev(struct super_block
*sb
)
87 struct ext2_super_block
*es
= EXT2_SB(sb
)->s_es
;
89 if (le32_to_cpu(es
->s_rev_level
) > EXT2_GOOD_OLD_REV
)
92 ext2_warning(sb
, __FUNCTION__
,
93 "updating to rev %d because of new feature flag, "
94 "running e2fsck is recommended",
97 es
->s_first_ino
= cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO
);
98 es
->s_inode_size
= cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE
);
99 es
->s_rev_level
= cpu_to_le32(EXT2_DYNAMIC_REV
);
100 /* leave es->s_feature_*compat flags alone */
101 /* es->s_uuid will be set by e2fsck if empty */
104 * The rest of the superblock fields should be zero, and if not it
105 * means they are likely already in use, so leave them alone. We
106 * can leave it up to e2fsck to clean up any inconsistencies there.
110 static void ext2_put_super (struct super_block
* sb
)
114 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
116 ext2_xattr_put_super(sb
);
117 if (!(sb
->s_flags
& MS_RDONLY
)) {
118 struct ext2_super_block
*es
= sbi
->s_es
;
120 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
121 ext2_sync_super(sb
, es
);
123 db_count
= sbi
->s_gdb_count
;
124 for (i
= 0; i
< db_count
; i
++)
125 if (sbi
->s_group_desc
[i
])
126 brelse (sbi
->s_group_desc
[i
]);
127 kfree(sbi
->s_group_desc
);
129 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
130 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
131 percpu_counter_destroy(&sbi
->s_dirs_counter
);
133 sb
->s_fs_info
= NULL
;
139 static kmem_cache_t
* ext2_inode_cachep
;
141 static struct inode
*ext2_alloc_inode(struct super_block
*sb
)
143 struct ext2_inode_info
*ei
;
144 ei
= (struct ext2_inode_info
*)kmem_cache_alloc(ext2_inode_cachep
, SLAB_KERNEL
);
147 #ifdef CONFIG_EXT2_FS_POSIX_ACL
148 ei
->i_acl
= EXT2_ACL_NOT_CACHED
;
149 ei
->i_default_acl
= EXT2_ACL_NOT_CACHED
;
151 ei
->vfs_inode
.i_version
= 1;
152 return &ei
->vfs_inode
;
155 static void ext2_destroy_inode(struct inode
*inode
)
157 kmem_cache_free(ext2_inode_cachep
, EXT2_I(inode
));
160 static void init_once(void * foo
, kmem_cache_t
* cachep
, unsigned long flags
)
162 struct ext2_inode_info
*ei
= (struct ext2_inode_info
*) foo
;
164 if ((flags
& (SLAB_CTOR_VERIFY
|SLAB_CTOR_CONSTRUCTOR
)) ==
165 SLAB_CTOR_CONSTRUCTOR
) {
166 rwlock_init(&ei
->i_meta_lock
);
167 #ifdef CONFIG_EXT2_FS_XATTR
168 init_rwsem(&ei
->xattr_sem
);
170 inode_init_once(&ei
->vfs_inode
);
174 static int init_inodecache(void)
176 ext2_inode_cachep
= kmem_cache_create("ext2_inode_cache",
177 sizeof(struct ext2_inode_info
),
178 0, SLAB_RECLAIM_ACCOUNT
,
180 if (ext2_inode_cachep
== NULL
)
185 static void destroy_inodecache(void)
187 if (kmem_cache_destroy(ext2_inode_cachep
))
188 printk(KERN_INFO
"ext2_inode_cache: not all structures were freed\n");
191 static void ext2_clear_inode(struct inode
*inode
)
193 #ifdef CONFIG_EXT2_FS_POSIX_ACL
194 struct ext2_inode_info
*ei
= EXT2_I(inode
);
196 if (ei
->i_acl
&& ei
->i_acl
!= EXT2_ACL_NOT_CACHED
) {
197 posix_acl_release(ei
->i_acl
);
198 ei
->i_acl
= EXT2_ACL_NOT_CACHED
;
200 if (ei
->i_default_acl
&& ei
->i_default_acl
!= EXT2_ACL_NOT_CACHED
) {
201 posix_acl_release(ei
->i_default_acl
);
202 ei
->i_default_acl
= EXT2_ACL_NOT_CACHED
;
207 static int ext2_show_options(struct seq_file
*seq
, struct vfsmount
*vfs
)
209 struct ext2_sb_info
*sbi
= EXT2_SB(vfs
->mnt_sb
);
211 if (sbi
->s_mount_opt
& EXT2_MOUNT_GRPID
)
212 seq_puts(seq
, ",grpid");
214 seq_puts(seq
, ",nogrpid");
216 #if defined(CONFIG_QUOTA)
217 if (sbi
->s_mount_opt
& EXT2_MOUNT_USRQUOTA
)
218 seq_puts(seq
, ",usrquota");
220 if (sbi
->s_mount_opt
& EXT2_MOUNT_GRPQUOTA
)
221 seq_puts(seq
, ",grpquota");
228 static ssize_t
ext2_quota_read(struct super_block
*sb
, int type
, char *data
, size_t len
, loff_t off
);
229 static ssize_t
ext2_quota_write(struct super_block
*sb
, int type
, const char *data
, size_t len
, loff_t off
);
232 static struct super_operations ext2_sops
= {
233 .alloc_inode
= ext2_alloc_inode
,
234 .destroy_inode
= ext2_destroy_inode
,
235 .read_inode
= ext2_read_inode
,
236 .write_inode
= ext2_write_inode
,
237 .put_inode
= ext2_put_inode
,
238 .delete_inode
= ext2_delete_inode
,
239 .put_super
= ext2_put_super
,
240 .write_super
= ext2_write_super
,
241 .statfs
= ext2_statfs
,
242 .remount_fs
= ext2_remount
,
243 .clear_inode
= ext2_clear_inode
,
244 .show_options
= ext2_show_options
,
246 .quota_read
= ext2_quota_read
,
247 .quota_write
= ext2_quota_write
,
251 /* Yes, most of these are left as NULL!!
252 * A NULL value implies the default, which works with ext2-like file
253 * systems, but can be improved upon.
254 * Currently only get_parent is required.
256 struct dentry
*ext2_get_parent(struct dentry
*child
);
257 static struct export_operations ext2_export_ops
= {
258 .get_parent
= ext2_get_parent
,
261 static unsigned long get_sb_block(void **data
)
263 unsigned long sb_block
;
264 char *options
= (char *) *data
;
266 if (!options
|| strncmp(options
, "sb=", 3) != 0)
267 return 1; /* Default location */
269 sb_block
= simple_strtoul(options
, &options
, 0);
270 if (*options
&& *options
!= ',') {
271 printk("EXT2-fs: Invalid sb specification: %s\n",
277 *data
= (void *) options
;
282 Opt_bsd_df
, Opt_minix_df
, Opt_grpid
, Opt_nogrpid
,
283 Opt_resgid
, Opt_resuid
, Opt_sb
, Opt_err_cont
, Opt_err_panic
,
284 Opt_err_ro
, Opt_nouid32
, Opt_nocheck
, Opt_debug
,
285 Opt_oldalloc
, Opt_orlov
, Opt_nobh
, Opt_user_xattr
, Opt_nouser_xattr
,
286 Opt_acl
, Opt_noacl
, Opt_xip
, Opt_ignore
, Opt_err
, Opt_quota
,
287 Opt_usrquota
, Opt_grpquota
290 static match_table_t tokens
= {
291 {Opt_bsd_df
, "bsddf"},
292 {Opt_minix_df
, "minixdf"},
293 {Opt_grpid
, "grpid"},
294 {Opt_grpid
, "bsdgroups"},
295 {Opt_nogrpid
, "nogrpid"},
296 {Opt_nogrpid
, "sysvgroups"},
297 {Opt_resgid
, "resgid=%u"},
298 {Opt_resuid
, "resuid=%u"},
300 {Opt_err_cont
, "errors=continue"},
301 {Opt_err_panic
, "errors=panic"},
302 {Opt_err_ro
, "errors=remount-ro"},
303 {Opt_nouid32
, "nouid32"},
304 {Opt_nocheck
, "check=none"},
305 {Opt_nocheck
, "nocheck"},
306 {Opt_debug
, "debug"},
307 {Opt_oldalloc
, "oldalloc"},
308 {Opt_orlov
, "orlov"},
310 {Opt_user_xattr
, "user_xattr"},
311 {Opt_nouser_xattr
, "nouser_xattr"},
313 {Opt_noacl
, "noacl"},
315 {Opt_grpquota
, "grpquota"},
316 {Opt_ignore
, "noquota"},
317 {Opt_quota
, "quota"},
318 {Opt_usrquota
, "usrquota"},
322 static int parse_options (char * options
,
323 struct ext2_sb_info
*sbi
)
326 substring_t args
[MAX_OPT_ARGS
];
327 unsigned long kind
= EXT2_MOUNT_ERRORS_CONT
;
333 while ((p
= strsep (&options
, ",")) != NULL
) {
338 token
= match_token(p
, tokens
, args
);
341 clear_opt (sbi
->s_mount_opt
, MINIX_DF
);
344 set_opt (sbi
->s_mount_opt
, MINIX_DF
);
347 set_opt (sbi
->s_mount_opt
, GRPID
);
350 clear_opt (sbi
->s_mount_opt
, GRPID
);
353 if (match_int(&args
[0], &option
))
355 sbi
->s_resuid
= option
;
358 if (match_int(&args
[0], &option
))
360 sbi
->s_resgid
= option
;
363 /* handled by get_sb_block() instead of here */
364 /* *sb_block = match_int(&args[0]); */
367 kind
= EXT2_MOUNT_ERRORS_PANIC
;
370 kind
= EXT2_MOUNT_ERRORS_RO
;
373 kind
= EXT2_MOUNT_ERRORS_CONT
;
376 set_opt (sbi
->s_mount_opt
, NO_UID32
);
379 clear_opt (sbi
->s_mount_opt
, CHECK
);
382 set_opt (sbi
->s_mount_opt
, DEBUG
);
385 set_opt (sbi
->s_mount_opt
, OLDALLOC
);
388 clear_opt (sbi
->s_mount_opt
, OLDALLOC
);
391 set_opt (sbi
->s_mount_opt
, NOBH
);
393 #ifdef CONFIG_EXT2_FS_XATTR
395 set_opt (sbi
->s_mount_opt
, XATTR_USER
);
397 case Opt_nouser_xattr
:
398 clear_opt (sbi
->s_mount_opt
, XATTR_USER
);
402 case Opt_nouser_xattr
:
403 printk("EXT2 (no)user_xattr options not supported\n");
406 #ifdef CONFIG_EXT2_FS_POSIX_ACL
408 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
411 clear_opt(sbi
->s_mount_opt
, POSIX_ACL
);
416 printk("EXT2 (no)acl options not supported\n");
420 #ifdef CONFIG_EXT2_FS_XIP
421 set_opt (sbi
->s_mount_opt
, XIP
);
423 printk("EXT2 xip option not supported\n");
427 #if defined(CONFIG_QUOTA)
430 set_opt(sbi
->s_mount_opt
, USRQUOTA
);
434 set_opt(sbi
->s_mount_opt
, GRPQUOTA
);
441 "EXT2-fs: quota operations not supported.\n");
452 sbi
->s_mount_opt
|= kind
;
456 static int ext2_setup_super (struct super_block
* sb
,
457 struct ext2_super_block
* es
,
461 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
463 if (le32_to_cpu(es
->s_rev_level
) > EXT2_MAX_SUPP_REV
) {
464 printk ("EXT2-fs warning: revision level too high, "
465 "forcing read-only mode\n");
470 if (!(sbi
->s_mount_state
& EXT2_VALID_FS
))
471 printk ("EXT2-fs warning: mounting unchecked fs, "
472 "running e2fsck is recommended\n");
473 else if ((sbi
->s_mount_state
& EXT2_ERROR_FS
))
474 printk ("EXT2-fs warning: mounting fs with errors, "
475 "running e2fsck is recommended\n");
476 else if ((__s16
) le16_to_cpu(es
->s_max_mnt_count
) >= 0 &&
477 le16_to_cpu(es
->s_mnt_count
) >=
478 (unsigned short) (__s16
) le16_to_cpu(es
->s_max_mnt_count
))
479 printk ("EXT2-fs warning: maximal mount count reached, "
480 "running e2fsck is recommended\n");
481 else if (le32_to_cpu(es
->s_checkinterval
) &&
482 (le32_to_cpu(es
->s_lastcheck
) + le32_to_cpu(es
->s_checkinterval
) <= get_seconds()))
483 printk ("EXT2-fs warning: checktime reached, "
484 "running e2fsck is recommended\n");
485 if (!le16_to_cpu(es
->s_max_mnt_count
))
486 es
->s_max_mnt_count
= cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT
);
487 es
->s_mnt_count
=cpu_to_le16(le16_to_cpu(es
->s_mnt_count
) + 1);
488 ext2_write_super(sb
);
489 if (test_opt (sb
, DEBUG
))
490 printk ("[EXT II FS %s, %s, bs=%lu, fs=%lu, gc=%lu, "
491 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
492 EXT2FS_VERSION
, EXT2FS_DATE
, sb
->s_blocksize
,
495 EXT2_BLOCKS_PER_GROUP(sb
),
496 EXT2_INODES_PER_GROUP(sb
),
501 static int ext2_check_descriptors (struct super_block
* sb
)
505 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
506 unsigned long block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
);
507 struct ext2_group_desc
* gdp
= NULL
;
509 ext2_debug ("Checking group descriptors");
511 for (i
= 0; i
< sbi
->s_groups_count
; i
++)
513 if ((i
% EXT2_DESC_PER_BLOCK(sb
)) == 0)
514 gdp
= (struct ext2_group_desc
*) sbi
->s_group_desc
[desc_block
++]->b_data
;
515 if (le32_to_cpu(gdp
->bg_block_bitmap
) < block
||
516 le32_to_cpu(gdp
->bg_block_bitmap
) >= block
+ EXT2_BLOCKS_PER_GROUP(sb
))
518 ext2_error (sb
, "ext2_check_descriptors",
519 "Block bitmap for group %d"
520 " not in group (block %lu)!",
521 i
, (unsigned long) le32_to_cpu(gdp
->bg_block_bitmap
));
524 if (le32_to_cpu(gdp
->bg_inode_bitmap
) < block
||
525 le32_to_cpu(gdp
->bg_inode_bitmap
) >= block
+ EXT2_BLOCKS_PER_GROUP(sb
))
527 ext2_error (sb
, "ext2_check_descriptors",
528 "Inode bitmap for group %d"
529 " not in group (block %lu)!",
530 i
, (unsigned long) le32_to_cpu(gdp
->bg_inode_bitmap
));
533 if (le32_to_cpu(gdp
->bg_inode_table
) < block
||
534 le32_to_cpu(gdp
->bg_inode_table
) + sbi
->s_itb_per_group
>=
535 block
+ EXT2_BLOCKS_PER_GROUP(sb
))
537 ext2_error (sb
, "ext2_check_descriptors",
538 "Inode table for group %d"
539 " not in group (block %lu)!",
540 i
, (unsigned long) le32_to_cpu(gdp
->bg_inode_table
));
543 block
+= EXT2_BLOCKS_PER_GROUP(sb
);
549 #define log2(n) ffz(~(n))
552 * Maximal file size. There is a direct, and {,double-,triple-}indirect
553 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
554 * We need to be 1 filesystem block less than the 2^32 sector limit.
556 static loff_t
ext2_max_size(int bits
)
558 loff_t res
= EXT2_NDIR_BLOCKS
;
559 /* This constant is calculated to be the largest file size for a
560 * dense, 4k-blocksize file such that the total number of
561 * sectors in the file, including data and all indirect blocks,
562 * does not exceed 2^32. */
563 const loff_t upper_limit
= 0x1ff7fffd000LL
;
565 res
+= 1LL << (bits
-2);
566 res
+= 1LL << (2*(bits
-2));
567 res
+= 1LL << (3*(bits
-2));
569 if (res
> upper_limit
)
574 static unsigned long descriptor_loc(struct super_block
*sb
,
575 unsigned long logic_sb_block
,
578 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
579 unsigned long bg
, first_data_block
, first_meta_bg
;
582 first_data_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
);
583 first_meta_bg
= le32_to_cpu(sbi
->s_es
->s_first_meta_bg
);
585 if (!EXT2_HAS_INCOMPAT_FEATURE(sb
, EXT2_FEATURE_INCOMPAT_META_BG
) ||
587 return (logic_sb_block
+ nr
+ 1);
588 bg
= sbi
->s_desc_per_block
* nr
;
589 if (ext2_bg_has_super(sb
, bg
))
591 return (first_data_block
+ has_super
+ (bg
* sbi
->s_blocks_per_group
));
594 static int ext2_fill_super(struct super_block
*sb
, void *data
, int silent
)
596 struct buffer_head
* bh
;
597 struct ext2_sb_info
* sbi
;
598 struct ext2_super_block
* es
;
601 unsigned long sb_block
= get_sb_block(&data
);
602 unsigned long logic_sb_block
;
603 unsigned long offset
= 0;
604 unsigned long def_mount_opts
;
605 int blocksize
= BLOCK_SIZE
;
610 sbi
= kmalloc(sizeof(*sbi
), GFP_KERNEL
);
614 memset(sbi
, 0, sizeof(*sbi
));
617 * See what the current blocksize for the device is, and
618 * use that as the blocksize. Otherwise (or if the blocksize
619 * is smaller than the default) use the default.
620 * This is important for devices that have a hardware
621 * sectorsize that is larger than the default.
623 blocksize
= sb_min_blocksize(sb
, BLOCK_SIZE
);
625 printk ("EXT2-fs: unable to set blocksize\n");
630 * If the superblock doesn't start on a hardware sector boundary,
631 * calculate the offset.
633 if (blocksize
!= BLOCK_SIZE
) {
634 logic_sb_block
= (sb_block
*BLOCK_SIZE
) / blocksize
;
635 offset
= (sb_block
*BLOCK_SIZE
) % blocksize
;
637 logic_sb_block
= sb_block
;
640 if (!(bh
= sb_bread(sb
, logic_sb_block
))) {
641 printk ("EXT2-fs: unable to read superblock\n");
645 * Note: s_es must be initialized as soon as possible because
646 * some ext2 macro-instructions depend on its value
648 es
= (struct ext2_super_block
*) (((char *)bh
->b_data
) + offset
);
650 sb
->s_magic
= le16_to_cpu(es
->s_magic
);
652 if (sb
->s_magic
!= EXT2_SUPER_MAGIC
)
655 /* Set defaults before we parse the mount options */
656 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
657 if (def_mount_opts
& EXT2_DEFM_DEBUG
)
658 set_opt(sbi
->s_mount_opt
, DEBUG
);
659 if (def_mount_opts
& EXT2_DEFM_BSDGROUPS
)
660 set_opt(sbi
->s_mount_opt
, GRPID
);
661 if (def_mount_opts
& EXT2_DEFM_UID16
)
662 set_opt(sbi
->s_mount_opt
, NO_UID32
);
663 if (def_mount_opts
& EXT2_DEFM_XATTR_USER
)
664 set_opt(sbi
->s_mount_opt
, XATTR_USER
);
665 if (def_mount_opts
& EXT2_DEFM_ACL
)
666 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
668 if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT2_ERRORS_PANIC
)
669 set_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
670 else if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT2_ERRORS_RO
)
671 set_opt(sbi
->s_mount_opt
, ERRORS_RO
);
673 sbi
->s_resuid
= le16_to_cpu(es
->s_def_resuid
);
674 sbi
->s_resgid
= le16_to_cpu(es
->s_def_resgid
);
676 if (!parse_options ((char *) data
, sbi
))
679 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
680 ((EXT2_SB(sb
)->s_mount_opt
& EXT2_MOUNT_POSIX_ACL
) ?
683 ext2_xip_verify_sb(sb
); /* see if bdev supports xip, unset
684 EXT2_MOUNT_XIP if not */
686 if (le32_to_cpu(es
->s_rev_level
) == EXT2_GOOD_OLD_REV
&&
687 (EXT2_HAS_COMPAT_FEATURE(sb
, ~0U) ||
688 EXT2_HAS_RO_COMPAT_FEATURE(sb
, ~0U) ||
689 EXT2_HAS_INCOMPAT_FEATURE(sb
, ~0U)))
690 printk("EXT2-fs warning: feature flags set on rev 0 fs, "
691 "running e2fsck is recommended\n");
693 * Check feature flags regardless of the revision level, since we
694 * previously didn't change the revision level when setting the flags,
695 * so there is a chance incompat flags are set on a rev 0 filesystem.
697 features
= EXT2_HAS_INCOMPAT_FEATURE(sb
, ~EXT2_FEATURE_INCOMPAT_SUPP
);
699 printk("EXT2-fs: %s: couldn't mount because of "
700 "unsupported optional features (%x).\n",
701 sb
->s_id
, le32_to_cpu(features
));
704 if (!(sb
->s_flags
& MS_RDONLY
) &&
705 (features
= EXT2_HAS_RO_COMPAT_FEATURE(sb
, ~EXT2_FEATURE_RO_COMPAT_SUPP
))){
706 printk("EXT2-fs: %s: couldn't mount RDWR because of "
707 "unsupported optional features (%x).\n",
708 sb
->s_id
, le32_to_cpu(features
));
712 blocksize
= BLOCK_SIZE
<< le32_to_cpu(sbi
->s_es
->s_log_block_size
);
714 if ((ext2_use_xip(sb
)) && ((blocksize
!= PAGE_SIZE
) ||
715 (sb
->s_blocksize
!= blocksize
))) {
717 printk("XIP: Unsupported blocksize\n");
721 /* If the blocksize doesn't match, re-read the thing.. */
722 if (sb
->s_blocksize
!= blocksize
) {
725 if (!sb_set_blocksize(sb
, blocksize
)) {
726 printk(KERN_ERR
"EXT2-fs: blocksize too small for device.\n");
730 logic_sb_block
= (sb_block
*BLOCK_SIZE
) / blocksize
;
731 offset
= (sb_block
*BLOCK_SIZE
) % blocksize
;
732 bh
= sb_bread(sb
, logic_sb_block
);
734 printk("EXT2-fs: Couldn't read superblock on "
738 es
= (struct ext2_super_block
*) (((char *)bh
->b_data
) + offset
);
740 if (es
->s_magic
!= cpu_to_le16(EXT2_SUPER_MAGIC
)) {
741 printk ("EXT2-fs: Magic mismatch, very weird !\n");
746 sb
->s_maxbytes
= ext2_max_size(sb
->s_blocksize_bits
);
748 if (le32_to_cpu(es
->s_rev_level
) == EXT2_GOOD_OLD_REV
) {
749 sbi
->s_inode_size
= EXT2_GOOD_OLD_INODE_SIZE
;
750 sbi
->s_first_ino
= EXT2_GOOD_OLD_FIRST_INO
;
752 sbi
->s_inode_size
= le16_to_cpu(es
->s_inode_size
);
753 sbi
->s_first_ino
= le32_to_cpu(es
->s_first_ino
);
754 if ((sbi
->s_inode_size
< EXT2_GOOD_OLD_INODE_SIZE
) ||
755 (sbi
->s_inode_size
& (sbi
->s_inode_size
- 1)) ||
756 (sbi
->s_inode_size
> blocksize
)) {
757 printk ("EXT2-fs: unsupported inode size: %d\n",
763 sbi
->s_frag_size
= EXT2_MIN_FRAG_SIZE
<<
764 le32_to_cpu(es
->s_log_frag_size
);
765 if (sbi
->s_frag_size
== 0)
767 sbi
->s_frags_per_block
= sb
->s_blocksize
/ sbi
->s_frag_size
;
769 sbi
->s_blocks_per_group
= le32_to_cpu(es
->s_blocks_per_group
);
770 sbi
->s_frags_per_group
= le32_to_cpu(es
->s_frags_per_group
);
771 sbi
->s_inodes_per_group
= le32_to_cpu(es
->s_inodes_per_group
);
773 if (EXT2_INODE_SIZE(sb
) == 0)
775 sbi
->s_inodes_per_block
= sb
->s_blocksize
/ EXT2_INODE_SIZE(sb
);
776 if (sbi
->s_inodes_per_block
== 0)
778 sbi
->s_itb_per_group
= sbi
->s_inodes_per_group
/
779 sbi
->s_inodes_per_block
;
780 sbi
->s_desc_per_block
= sb
->s_blocksize
/
781 sizeof (struct ext2_group_desc
);
783 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
784 sbi
->s_addr_per_block_bits
=
785 log2 (EXT2_ADDR_PER_BLOCK(sb
));
786 sbi
->s_desc_per_block_bits
=
787 log2 (EXT2_DESC_PER_BLOCK(sb
));
789 if (sb
->s_magic
!= EXT2_SUPER_MAGIC
)
792 if (sb
->s_blocksize
!= bh
->b_size
) {
794 printk ("VFS: Unsupported blocksize on dev "
799 if (sb
->s_blocksize
!= sbi
->s_frag_size
) {
800 printk ("EXT2-fs: fragsize %lu != blocksize %lu (not supported yet)\n",
801 sbi
->s_frag_size
, sb
->s_blocksize
);
805 if (sbi
->s_blocks_per_group
> sb
->s_blocksize
* 8) {
806 printk ("EXT2-fs: #blocks per group too big: %lu\n",
807 sbi
->s_blocks_per_group
);
810 if (sbi
->s_frags_per_group
> sb
->s_blocksize
* 8) {
811 printk ("EXT2-fs: #fragments per group too big: %lu\n",
812 sbi
->s_frags_per_group
);
815 if (sbi
->s_inodes_per_group
> sb
->s_blocksize
* 8) {
816 printk ("EXT2-fs: #inodes per group too big: %lu\n",
817 sbi
->s_inodes_per_group
);
821 if (EXT2_BLOCKS_PER_GROUP(sb
) == 0)
823 sbi
->s_groups_count
= (le32_to_cpu(es
->s_blocks_count
) -
824 le32_to_cpu(es
->s_first_data_block
) +
825 EXT2_BLOCKS_PER_GROUP(sb
) - 1) /
826 EXT2_BLOCKS_PER_GROUP(sb
);
827 db_count
= (sbi
->s_groups_count
+ EXT2_DESC_PER_BLOCK(sb
) - 1) /
828 EXT2_DESC_PER_BLOCK(sb
);
829 sbi
->s_group_desc
= kmalloc (db_count
* sizeof (struct buffer_head
*), GFP_KERNEL
);
830 if (sbi
->s_group_desc
== NULL
) {
831 printk ("EXT2-fs: not enough memory\n");
834 percpu_counter_init(&sbi
->s_freeblocks_counter
);
835 percpu_counter_init(&sbi
->s_freeinodes_counter
);
836 percpu_counter_init(&sbi
->s_dirs_counter
);
837 bgl_lock_init(&sbi
->s_blockgroup_lock
);
838 sbi
->s_debts
= kmalloc(sbi
->s_groups_count
* sizeof(*sbi
->s_debts
),
841 printk ("EXT2-fs: not enough memory\n");
842 goto failed_mount_group_desc
;
844 memset(sbi
->s_debts
, 0, sbi
->s_groups_count
* sizeof(*sbi
->s_debts
));
845 for (i
= 0; i
< db_count
; i
++) {
846 block
= descriptor_loc(sb
, logic_sb_block
, i
);
847 sbi
->s_group_desc
[i
] = sb_bread(sb
, block
);
848 if (!sbi
->s_group_desc
[i
]) {
849 for (j
= 0; j
< i
; j
++)
850 brelse (sbi
->s_group_desc
[j
]);
851 printk ("EXT2-fs: unable to read group descriptors\n");
852 goto failed_mount_group_desc
;
855 if (!ext2_check_descriptors (sb
)) {
856 printk ("EXT2-fs: group descriptors corrupted!\n");
860 sbi
->s_gdb_count
= db_count
;
861 get_random_bytes(&sbi
->s_next_generation
, sizeof(u32
));
862 spin_lock_init(&sbi
->s_next_gen_lock
);
864 * set up enough so that it can read an inode
866 sb
->s_op
= &ext2_sops
;
867 sb
->s_export_op
= &ext2_export_ops
;
868 sb
->s_xattr
= ext2_xattr_handlers
;
869 root
= iget(sb
, EXT2_ROOT_INO
);
870 sb
->s_root
= d_alloc_root(root
);
873 printk(KERN_ERR
"EXT2-fs: get root inode failed\n");
876 if (!S_ISDIR(root
->i_mode
) || !root
->i_blocks
|| !root
->i_size
) {
879 printk(KERN_ERR
"EXT2-fs: corrupt root inode, run e2fsck\n");
882 if (EXT2_HAS_COMPAT_FEATURE(sb
, EXT3_FEATURE_COMPAT_HAS_JOURNAL
))
883 ext2_warning(sb
, __FUNCTION__
,
884 "mounting ext3 filesystem as ext2");
885 ext2_setup_super (sb
, es
, sb
->s_flags
& MS_RDONLY
);
886 percpu_counter_mod(&sbi
->s_freeblocks_counter
,
887 ext2_count_free_blocks(sb
));
888 percpu_counter_mod(&sbi
->s_freeinodes_counter
,
889 ext2_count_free_inodes(sb
));
890 percpu_counter_mod(&sbi
->s_dirs_counter
,
891 ext2_count_dirs(sb
));
896 printk("VFS: Can't find an ext2 filesystem on dev %s.\n",
901 for (i
= 0; i
< db_count
; i
++)
902 brelse(sbi
->s_group_desc
[i
]);
903 failed_mount_group_desc
:
904 kfree(sbi
->s_group_desc
);
909 sb
->s_fs_info
= NULL
;
914 static void ext2_commit_super (struct super_block
* sb
,
915 struct ext2_super_block
* es
)
917 es
->s_wtime
= cpu_to_le32(get_seconds());
918 mark_buffer_dirty(EXT2_SB(sb
)->s_sbh
);
922 static void ext2_sync_super(struct super_block
*sb
, struct ext2_super_block
*es
)
924 es
->s_free_blocks_count
= cpu_to_le32(ext2_count_free_blocks(sb
));
925 es
->s_free_inodes_count
= cpu_to_le32(ext2_count_free_inodes(sb
));
926 es
->s_wtime
= cpu_to_le32(get_seconds());
927 mark_buffer_dirty(EXT2_SB(sb
)->s_sbh
);
928 sync_dirty_buffer(EXT2_SB(sb
)->s_sbh
);
933 * In the second extended file system, it is not necessary to
934 * write the super block since we use a mapping of the
935 * disk super block in a buffer.
937 * However, this function is still used to set the fs valid
938 * flags to 0. We need to set this flag to 0 since the fs
939 * may have been checked while mounted and e2fsck may have
940 * set s_state to EXT2_VALID_FS after some corrections.
943 void ext2_write_super (struct super_block
* sb
)
945 struct ext2_super_block
* es
;
947 if (!(sb
->s_flags
& MS_RDONLY
)) {
948 es
= EXT2_SB(sb
)->s_es
;
950 if (le16_to_cpu(es
->s_state
) & EXT2_VALID_FS
) {
951 ext2_debug ("setting valid to 0\n");
952 es
->s_state
= cpu_to_le16(le16_to_cpu(es
->s_state
) &
954 es
->s_free_blocks_count
= cpu_to_le32(ext2_count_free_blocks(sb
));
955 es
->s_free_inodes_count
= cpu_to_le32(ext2_count_free_inodes(sb
));
956 es
->s_mtime
= cpu_to_le32(get_seconds());
957 ext2_sync_super(sb
, es
);
959 ext2_commit_super (sb
, es
);
965 static int ext2_remount (struct super_block
* sb
, int * flags
, char * data
)
967 struct ext2_sb_info
* sbi
= EXT2_SB(sb
);
968 struct ext2_super_block
* es
;
969 unsigned long old_mount_opt
= sbi
->s_mount_opt
;
970 struct ext2_mount_options old_opts
;
971 unsigned long old_sb_flags
;
974 /* Store the old options */
975 old_sb_flags
= sb
->s_flags
;
976 old_opts
.s_mount_opt
= sbi
->s_mount_opt
;
977 old_opts
.s_resuid
= sbi
->s_resuid
;
978 old_opts
.s_resgid
= sbi
->s_resgid
;
981 * Allow the "check" option to be passed as a remount option.
983 if (!parse_options (data
, sbi
)) {
988 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
989 ((sbi
->s_mount_opt
& EXT2_MOUNT_POSIX_ACL
) ? MS_POSIXACL
: 0);
992 if (((sbi
->s_mount_opt
& EXT2_MOUNT_XIP
) !=
993 (old_mount_opt
& EXT2_MOUNT_XIP
)) &&
994 invalidate_inodes(sb
))
995 ext2_warning(sb
, __FUNCTION__
, "busy inodes while remounting "\
996 "xip remain in cache (no functional problem)");
997 if ((*flags
& MS_RDONLY
) == (sb
->s_flags
& MS_RDONLY
))
999 if (*flags
& MS_RDONLY
) {
1000 if (le16_to_cpu(es
->s_state
) & EXT2_VALID_FS
||
1001 !(sbi
->s_mount_state
& EXT2_VALID_FS
))
1004 * OK, we are remounting a valid rw partition rdonly, so set
1005 * the rdonly flag and then mark the partition as valid again.
1007 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
1008 es
->s_mtime
= cpu_to_le32(get_seconds());
1010 __le32 ret
= EXT2_HAS_RO_COMPAT_FEATURE(sb
,
1011 ~EXT2_FEATURE_RO_COMPAT_SUPP
);
1013 printk("EXT2-fs: %s: couldn't remount RDWR because of "
1014 "unsupported optional features (%x).\n",
1015 sb
->s_id
, le32_to_cpu(ret
));
1020 * Mounting a RDONLY partition read-write, so reread and
1021 * store the current valid flag. (It may have been changed
1022 * by e2fsck since we originally mounted the partition.)
1024 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
1025 if (!ext2_setup_super (sb
, es
, 0))
1026 sb
->s_flags
&= ~MS_RDONLY
;
1028 ext2_sync_super(sb
, es
);
1031 sbi
->s_mount_opt
= old_opts
.s_mount_opt
;
1032 sbi
->s_resuid
= old_opts
.s_resuid
;
1033 sbi
->s_resgid
= old_opts
.s_resgid
;
1034 sb
->s_flags
= old_sb_flags
;
1038 static int ext2_statfs (struct super_block
* sb
, struct kstatfs
* buf
)
1040 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
1041 unsigned long overhead
;
1044 if (test_opt (sb
, MINIX_DF
))
1048 * Compute the overhead (FS structures)
1052 * All of the blocks before first_data_block are
1055 overhead
= le32_to_cpu(sbi
->s_es
->s_first_data_block
);
1058 * Add the overhead attributed to the superblock and
1059 * block group descriptors. If the sparse superblocks
1060 * feature is turned on, then not all groups have this.
1062 for (i
= 0; i
< sbi
->s_groups_count
; i
++)
1063 overhead
+= ext2_bg_has_super(sb
, i
) +
1064 ext2_bg_num_gdb(sb
, i
);
1067 * Every block group has an inode bitmap, a block
1068 * bitmap, and an inode table.
1070 overhead
+= (sbi
->s_groups_count
*
1071 (2 + sbi
->s_itb_per_group
));
1074 buf
->f_type
= EXT2_SUPER_MAGIC
;
1075 buf
->f_bsize
= sb
->s_blocksize
;
1076 buf
->f_blocks
= le32_to_cpu(sbi
->s_es
->s_blocks_count
) - overhead
;
1077 buf
->f_bfree
= ext2_count_free_blocks(sb
);
1078 buf
->f_bavail
= buf
->f_bfree
- le32_to_cpu(sbi
->s_es
->s_r_blocks_count
);
1079 if (buf
->f_bfree
< le32_to_cpu(sbi
->s_es
->s_r_blocks_count
))
1081 buf
->f_files
= le32_to_cpu(sbi
->s_es
->s_inodes_count
);
1082 buf
->f_ffree
= ext2_count_free_inodes (sb
);
1083 buf
->f_namelen
= EXT2_NAME_LEN
;
1087 static struct super_block
*ext2_get_sb(struct file_system_type
*fs_type
,
1088 int flags
, const char *dev_name
, void *data
)
1090 return get_sb_bdev(fs_type
, flags
, dev_name
, data
, ext2_fill_super
);
1095 /* Read data from quotafile - avoid pagecache and such because we cannot afford
1096 * acquiring the locks... As quota files are never truncated and quota code
1097 * itself serializes the operations (and noone else should touch the files)
1098 * we don't have to be afraid of races */
1099 static ssize_t
ext2_quota_read(struct super_block
*sb
, int type
, char *data
,
1100 size_t len
, loff_t off
)
1102 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
1103 sector_t blk
= off
>> EXT2_BLOCK_SIZE_BITS(sb
);
1105 int offset
= off
& (sb
->s_blocksize
- 1);
1108 struct buffer_head tmp_bh
;
1109 struct buffer_head
*bh
;
1110 loff_t i_size
= i_size_read(inode
);
1114 if (off
+len
> i_size
)
1117 while (toread
> 0) {
1118 tocopy
= sb
->s_blocksize
- offset
< toread
?
1119 sb
->s_blocksize
- offset
: toread
;
1122 err
= ext2_get_block(inode
, blk
, &tmp_bh
, 0);
1125 if (!buffer_mapped(&tmp_bh
)) /* A hole? */
1126 memset(data
, 0, tocopy
);
1128 bh
= sb_bread(sb
, tmp_bh
.b_blocknr
);
1131 memcpy(data
, bh
->b_data
+offset
, tocopy
);
1142 /* Write to quotafile */
1143 static ssize_t
ext2_quota_write(struct super_block
*sb
, int type
,
1144 const char *data
, size_t len
, loff_t off
)
1146 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
1147 sector_t blk
= off
>> EXT2_BLOCK_SIZE_BITS(sb
);
1149 int offset
= off
& (sb
->s_blocksize
- 1);
1151 size_t towrite
= len
;
1152 struct buffer_head tmp_bh
;
1153 struct buffer_head
*bh
;
1155 mutex_lock(&inode
->i_mutex
);
1156 while (towrite
> 0) {
1157 tocopy
= sb
->s_blocksize
- offset
< towrite
?
1158 sb
->s_blocksize
- offset
: towrite
;
1161 err
= ext2_get_block(inode
, blk
, &tmp_bh
, 1);
1164 if (offset
|| tocopy
!= EXT2_BLOCK_SIZE(sb
))
1165 bh
= sb_bread(sb
, tmp_bh
.b_blocknr
);
1167 bh
= sb_getblk(sb
, tmp_bh
.b_blocknr
);
1173 memcpy(bh
->b_data
+offset
, data
, tocopy
);
1174 flush_dcache_page(bh
->b_page
);
1175 set_buffer_uptodate(bh
);
1176 mark_buffer_dirty(bh
);
1187 if (inode
->i_size
< off
+len
-towrite
)
1188 i_size_write(inode
, off
+len
-towrite
);
1190 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
1191 mark_inode_dirty(inode
);
1192 mutex_unlock(&inode
->i_mutex
);
1193 return len
- towrite
;
1198 static struct file_system_type ext2_fs_type
= {
1199 .owner
= THIS_MODULE
,
1201 .get_sb
= ext2_get_sb
,
1202 .kill_sb
= kill_block_super
,
1203 .fs_flags
= FS_REQUIRES_DEV
,
1206 static int __init
init_ext2_fs(void)
1208 int err
= init_ext2_xattr();
1211 err
= init_inodecache();
1214 err
= register_filesystem(&ext2_fs_type
);
1219 destroy_inodecache();
1225 static void __exit
exit_ext2_fs(void)
1227 unregister_filesystem(&ext2_fs_type
);
1228 destroy_inodecache();
1232 module_init(init_ext2_fs
)
1233 module_exit(exit_ext2_fs
)