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 <asm/uaccess.h>
40 static void ext2_sync_super(struct super_block
*sb
,
41 struct ext2_super_block
*es
);
42 static int ext2_remount (struct super_block
* sb
, int * flags
, char * data
);
43 static int ext2_statfs (struct dentry
* dentry
, struct kstatfs
* buf
);
45 void ext2_error (struct super_block
* sb
, const char * function
,
46 const char * fmt
, ...)
49 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
50 struct ext2_super_block
*es
= sbi
->s_es
;
52 if (!(sb
->s_flags
& MS_RDONLY
)) {
53 sbi
->s_mount_state
|= EXT2_ERROR_FS
;
55 cpu_to_le16(le16_to_cpu(es
->s_state
) | EXT2_ERROR_FS
);
56 ext2_sync_super(sb
, es
);
60 printk(KERN_CRIT
"EXT2-fs error (device %s): %s: ",sb
->s_id
, function
);
65 if (test_opt(sb
, ERRORS_PANIC
))
66 panic("EXT2-fs panic from previous error\n");
67 if (test_opt(sb
, ERRORS_RO
)) {
68 printk("Remounting filesystem read-only\n");
69 sb
->s_flags
|= MS_RDONLY
;
73 void ext2_warning (struct super_block
* sb
, const char * function
,
74 const char * fmt
, ...)
79 printk(KERN_WARNING
"EXT2-fs warning (device %s): %s: ",
86 void ext2_update_dynamic_rev(struct super_block
*sb
)
88 struct ext2_super_block
*es
= EXT2_SB(sb
)->s_es
;
90 if (le32_to_cpu(es
->s_rev_level
) > EXT2_GOOD_OLD_REV
)
93 ext2_warning(sb
, __FUNCTION__
,
94 "updating to rev %d because of new feature flag, "
95 "running e2fsck is recommended",
98 es
->s_first_ino
= cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO
);
99 es
->s_inode_size
= cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE
);
100 es
->s_rev_level
= cpu_to_le32(EXT2_DYNAMIC_REV
);
101 /* leave es->s_feature_*compat flags alone */
102 /* es->s_uuid will be set by e2fsck if empty */
105 * The rest of the superblock fields should be zero, and if not it
106 * means they are likely already in use, so leave them alone. We
107 * can leave it up to e2fsck to clean up any inconsistencies there.
111 static void ext2_put_super (struct super_block
* sb
)
115 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
117 ext2_xattr_put_super(sb
);
118 if (!(sb
->s_flags
& MS_RDONLY
)) {
119 struct ext2_super_block
*es
= sbi
->s_es
;
121 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
122 ext2_sync_super(sb
, es
);
124 db_count
= sbi
->s_gdb_count
;
125 for (i
= 0; i
< db_count
; i
++)
126 if (sbi
->s_group_desc
[i
])
127 brelse (sbi
->s_group_desc
[i
]);
128 kfree(sbi
->s_group_desc
);
130 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
131 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
132 percpu_counter_destroy(&sbi
->s_dirs_counter
);
134 sb
->s_fs_info
= NULL
;
140 static struct kmem_cache
* ext2_inode_cachep
;
142 static struct inode
*ext2_alloc_inode(struct super_block
*sb
)
144 struct ext2_inode_info
*ei
;
145 ei
= (struct ext2_inode_info
*)kmem_cache_alloc(ext2_inode_cachep
, GFP_KERNEL
);
148 #ifdef CONFIG_EXT2_FS_POSIX_ACL
149 ei
->i_acl
= EXT2_ACL_NOT_CACHED
;
150 ei
->i_default_acl
= EXT2_ACL_NOT_CACHED
;
152 ei
->i_block_alloc_info
= NULL
;
153 ei
->vfs_inode
.i_version
= 1;
154 return &ei
->vfs_inode
;
157 static void ext2_destroy_inode(struct inode
*inode
)
159 kmem_cache_free(ext2_inode_cachep
, EXT2_I(inode
));
162 static void init_once(struct kmem_cache
* cachep
, void *foo
)
164 struct ext2_inode_info
*ei
= (struct ext2_inode_info
*) foo
;
166 rwlock_init(&ei
->i_meta_lock
);
167 #ifdef CONFIG_EXT2_FS_XATTR
168 init_rwsem(&ei
->xattr_sem
);
170 mutex_init(&ei
->truncate_mutex
);
171 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
|
181 if (ext2_inode_cachep
== NULL
)
186 static void destroy_inodecache(void)
188 kmem_cache_destroy(ext2_inode_cachep
);
191 static void ext2_clear_inode(struct inode
*inode
)
193 struct ext2_block_alloc_info
*rsv
= EXT2_I(inode
)->i_block_alloc_info
;
194 #ifdef CONFIG_EXT2_FS_POSIX_ACL
195 struct ext2_inode_info
*ei
= EXT2_I(inode
);
197 if (ei
->i_acl
&& ei
->i_acl
!= EXT2_ACL_NOT_CACHED
) {
198 posix_acl_release(ei
->i_acl
);
199 ei
->i_acl
= EXT2_ACL_NOT_CACHED
;
201 if (ei
->i_default_acl
&& ei
->i_default_acl
!= EXT2_ACL_NOT_CACHED
) {
202 posix_acl_release(ei
->i_default_acl
);
203 ei
->i_default_acl
= EXT2_ACL_NOT_CACHED
;
206 ext2_discard_reservation(inode
);
207 EXT2_I(inode
)->i_block_alloc_info
= NULL
;
212 static int ext2_show_options(struct seq_file
*seq
, struct vfsmount
*vfs
)
214 struct super_block
*sb
= vfs
->mnt_sb
;
215 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
216 struct ext2_super_block
*es
= sbi
->s_es
;
217 unsigned long def_mount_opts
;
219 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
221 if (sbi
->s_sb_block
!= 1)
222 seq_printf(seq
, ",sb=%lu", sbi
->s_sb_block
);
223 if (test_opt(sb
, MINIX_DF
))
224 seq_puts(seq
, ",minixdf");
225 if (test_opt(sb
, GRPID
))
226 seq_puts(seq
, ",grpid");
227 if (!test_opt(sb
, GRPID
) && (def_mount_opts
& EXT2_DEFM_BSDGROUPS
))
228 seq_puts(seq
, ",nogrpid");
229 if (sbi
->s_resuid
!= EXT2_DEF_RESUID
||
230 le16_to_cpu(es
->s_def_resuid
) != EXT2_DEF_RESUID
) {
231 seq_printf(seq
, ",resuid=%u", sbi
->s_resuid
);
233 if (sbi
->s_resgid
!= EXT2_DEF_RESGID
||
234 le16_to_cpu(es
->s_def_resgid
) != EXT2_DEF_RESGID
) {
235 seq_printf(seq
, ",resgid=%u", sbi
->s_resgid
);
237 if (test_opt(sb
, ERRORS_RO
)) {
238 int def_errors
= le16_to_cpu(es
->s_errors
);
240 if (def_errors
== EXT2_ERRORS_PANIC
||
241 def_errors
== EXT2_ERRORS_CONTINUE
) {
242 seq_puts(seq
, ",errors=remount-ro");
245 if (test_opt(sb
, ERRORS_CONT
))
246 seq_puts(seq
, ",errors=continue");
247 if (test_opt(sb
, ERRORS_PANIC
))
248 seq_puts(seq
, ",errors=panic");
249 if (test_opt(sb
, NO_UID32
))
250 seq_puts(seq
, ",nouid32");
251 if (test_opt(sb
, DEBUG
))
252 seq_puts(seq
, ",debug");
253 if (test_opt(sb
, OLDALLOC
))
254 seq_puts(seq
, ",oldalloc");
256 #ifdef CONFIG_EXT2_FS_XATTR
257 if (test_opt(sb
, XATTR_USER
))
258 seq_puts(seq
, ",user_xattr");
259 if (!test_opt(sb
, XATTR_USER
) &&
260 (def_mount_opts
& EXT2_DEFM_XATTR_USER
)) {
261 seq_puts(seq
, ",nouser_xattr");
265 #ifdef CONFIG_EXT2_FS_POSIX_ACL
266 if (test_opt(sb
, POSIX_ACL
))
267 seq_puts(seq
, ",acl");
268 if (!test_opt(sb
, POSIX_ACL
) && (def_mount_opts
& EXT2_DEFM_ACL
))
269 seq_puts(seq
, ",noacl");
272 if (test_opt(sb
, NOBH
))
273 seq_puts(seq
, ",nobh");
275 #if defined(CONFIG_QUOTA)
276 if (sbi
->s_mount_opt
& EXT2_MOUNT_USRQUOTA
)
277 seq_puts(seq
, ",usrquota");
279 if (sbi
->s_mount_opt
& EXT2_MOUNT_GRPQUOTA
)
280 seq_puts(seq
, ",grpquota");
283 #if defined(CONFIG_EXT2_FS_XIP)
284 if (sbi
->s_mount_opt
& EXT2_MOUNT_XIP
)
285 seq_puts(seq
, ",xip");
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 .statfs
= ext2_statfs
,
304 .remount_fs
= ext2_remount
,
305 .clear_inode
= ext2_clear_inode
,
306 .show_options
= ext2_show_options
,
308 .quota_read
= ext2_quota_read
,
309 .quota_write
= ext2_quota_write
,
313 static struct inode
*ext2_nfs_get_inode(struct super_block
*sb
,
314 u64 ino
, u32 generation
)
318 if (ino
< EXT2_FIRST_INO(sb
) && ino
!= EXT2_ROOT_INO
)
319 return ERR_PTR(-ESTALE
);
320 if (ino
> le32_to_cpu(EXT2_SB(sb
)->s_es
->s_inodes_count
))
321 return ERR_PTR(-ESTALE
);
323 /* iget isn't really right if the inode is currently unallocated!!
324 * ext2_read_inode currently does appropriate checks, but
325 * it might be "neater" to call ext2_get_inode first and check
326 * if the inode is valid.....
328 inode
= ext2_iget(sb
, ino
);
330 return ERR_CAST(inode
);
331 if (generation
&& inode
->i_generation
!= generation
) {
332 /* we didn't find the right inode.. */
334 return ERR_PTR(-ESTALE
);
339 static struct dentry
*ext2_fh_to_dentry(struct super_block
*sb
, struct fid
*fid
,
340 int fh_len
, int fh_type
)
342 return generic_fh_to_dentry(sb
, fid
, fh_len
, fh_type
,
346 static struct dentry
*ext2_fh_to_parent(struct super_block
*sb
, struct fid
*fid
,
347 int fh_len
, int fh_type
)
349 return generic_fh_to_parent(sb
, fid
, fh_len
, fh_type
,
353 /* Yes, most of these are left as NULL!!
354 * A NULL value implies the default, which works with ext2-like file
355 * systems, but can be improved upon.
356 * Currently only get_parent is required.
358 static const struct export_operations ext2_export_ops
= {
359 .fh_to_dentry
= ext2_fh_to_dentry
,
360 .fh_to_parent
= ext2_fh_to_parent
,
361 .get_parent
= ext2_get_parent
,
364 static unsigned long get_sb_block(void **data
)
366 unsigned long sb_block
;
367 char *options
= (char *) *data
;
369 if (!options
|| strncmp(options
, "sb=", 3) != 0)
370 return 1; /* Default location */
372 sb_block
= simple_strtoul(options
, &options
, 0);
373 if (*options
&& *options
!= ',') {
374 printk("EXT2-fs: Invalid sb specification: %s\n",
380 *data
= (void *) options
;
385 Opt_bsd_df
, Opt_minix_df
, Opt_grpid
, Opt_nogrpid
,
386 Opt_resgid
, Opt_resuid
, Opt_sb
, Opt_err_cont
, Opt_err_panic
,
387 Opt_err_ro
, Opt_nouid32
, Opt_nocheck
, Opt_debug
,
388 Opt_oldalloc
, Opt_orlov
, Opt_nobh
, Opt_user_xattr
, Opt_nouser_xattr
,
389 Opt_acl
, Opt_noacl
, Opt_xip
, Opt_ignore
, Opt_err
, Opt_quota
,
390 Opt_usrquota
, Opt_grpquota
, Opt_reservation
, Opt_noreservation
393 static match_table_t tokens
= {
394 {Opt_bsd_df
, "bsddf"},
395 {Opt_minix_df
, "minixdf"},
396 {Opt_grpid
, "grpid"},
397 {Opt_grpid
, "bsdgroups"},
398 {Opt_nogrpid
, "nogrpid"},
399 {Opt_nogrpid
, "sysvgroups"},
400 {Opt_resgid
, "resgid=%u"},
401 {Opt_resuid
, "resuid=%u"},
403 {Opt_err_cont
, "errors=continue"},
404 {Opt_err_panic
, "errors=panic"},
405 {Opt_err_ro
, "errors=remount-ro"},
406 {Opt_nouid32
, "nouid32"},
407 {Opt_nocheck
, "check=none"},
408 {Opt_nocheck
, "nocheck"},
409 {Opt_debug
, "debug"},
410 {Opt_oldalloc
, "oldalloc"},
411 {Opt_orlov
, "orlov"},
413 {Opt_user_xattr
, "user_xattr"},
414 {Opt_nouser_xattr
, "nouser_xattr"},
416 {Opt_noacl
, "noacl"},
418 {Opt_grpquota
, "grpquota"},
419 {Opt_ignore
, "noquota"},
420 {Opt_quota
, "quota"},
421 {Opt_usrquota
, "usrquota"},
422 {Opt_reservation
, "reservation"},
423 {Opt_noreservation
, "noreservation"},
427 static int parse_options (char * options
,
428 struct ext2_sb_info
*sbi
)
431 substring_t args
[MAX_OPT_ARGS
];
437 while ((p
= strsep (&options
, ",")) != NULL
) {
442 token
= match_token(p
, tokens
, args
);
445 clear_opt (sbi
->s_mount_opt
, MINIX_DF
);
448 set_opt (sbi
->s_mount_opt
, MINIX_DF
);
451 set_opt (sbi
->s_mount_opt
, GRPID
);
454 clear_opt (sbi
->s_mount_opt
, GRPID
);
457 if (match_int(&args
[0], &option
))
459 sbi
->s_resuid
= option
;
462 if (match_int(&args
[0], &option
))
464 sbi
->s_resgid
= option
;
467 /* handled by get_sb_block() instead of here */
468 /* *sb_block = match_int(&args[0]); */
471 clear_opt (sbi
->s_mount_opt
, ERRORS_CONT
);
472 clear_opt (sbi
->s_mount_opt
, ERRORS_RO
);
473 set_opt (sbi
->s_mount_opt
, ERRORS_PANIC
);
476 clear_opt (sbi
->s_mount_opt
, ERRORS_CONT
);
477 clear_opt (sbi
->s_mount_opt
, ERRORS_PANIC
);
478 set_opt (sbi
->s_mount_opt
, ERRORS_RO
);
481 clear_opt (sbi
->s_mount_opt
, ERRORS_RO
);
482 clear_opt (sbi
->s_mount_opt
, ERRORS_PANIC
);
483 set_opt (sbi
->s_mount_opt
, ERRORS_CONT
);
486 set_opt (sbi
->s_mount_opt
, NO_UID32
);
489 clear_opt (sbi
->s_mount_opt
, CHECK
);
492 set_opt (sbi
->s_mount_opt
, DEBUG
);
495 set_opt (sbi
->s_mount_opt
, OLDALLOC
);
498 clear_opt (sbi
->s_mount_opt
, OLDALLOC
);
501 set_opt (sbi
->s_mount_opt
, NOBH
);
503 #ifdef CONFIG_EXT2_FS_XATTR
505 set_opt (sbi
->s_mount_opt
, XATTR_USER
);
507 case Opt_nouser_xattr
:
508 clear_opt (sbi
->s_mount_opt
, XATTR_USER
);
512 case Opt_nouser_xattr
:
513 printk("EXT2 (no)user_xattr options not supported\n");
516 #ifdef CONFIG_EXT2_FS_POSIX_ACL
518 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
521 clear_opt(sbi
->s_mount_opt
, POSIX_ACL
);
526 printk("EXT2 (no)acl options not supported\n");
530 #ifdef CONFIG_EXT2_FS_XIP
531 set_opt (sbi
->s_mount_opt
, XIP
);
533 printk("EXT2 xip option not supported\n");
537 #if defined(CONFIG_QUOTA)
540 set_opt(sbi
->s_mount_opt
, USRQUOTA
);
544 set_opt(sbi
->s_mount_opt
, GRPQUOTA
);
551 "EXT2-fs: quota operations not supported.\n");
556 case Opt_reservation
:
557 set_opt(sbi
->s_mount_opt
, RESERVATION
);
558 printk("reservations ON\n");
560 case Opt_noreservation
:
561 clear_opt(sbi
->s_mount_opt
, RESERVATION
);
562 printk("reservations OFF\n");
573 static int ext2_setup_super (struct super_block
* sb
,
574 struct ext2_super_block
* es
,
578 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
580 if (le32_to_cpu(es
->s_rev_level
) > EXT2_MAX_SUPP_REV
) {
581 printk ("EXT2-fs warning: revision level too high, "
582 "forcing read-only mode\n");
587 if (!(sbi
->s_mount_state
& EXT2_VALID_FS
))
588 printk ("EXT2-fs warning: mounting unchecked fs, "
589 "running e2fsck is recommended\n");
590 else if ((sbi
->s_mount_state
& EXT2_ERROR_FS
))
591 printk ("EXT2-fs warning: mounting fs with errors, "
592 "running e2fsck is recommended\n");
593 else if ((__s16
) le16_to_cpu(es
->s_max_mnt_count
) >= 0 &&
594 le16_to_cpu(es
->s_mnt_count
) >=
595 (unsigned short) (__s16
) le16_to_cpu(es
->s_max_mnt_count
))
596 printk ("EXT2-fs warning: maximal mount count reached, "
597 "running e2fsck is recommended\n");
598 else if (le32_to_cpu(es
->s_checkinterval
) &&
599 (le32_to_cpu(es
->s_lastcheck
) + le32_to_cpu(es
->s_checkinterval
) <= get_seconds()))
600 printk ("EXT2-fs warning: checktime reached, "
601 "running e2fsck is recommended\n");
602 if (!le16_to_cpu(es
->s_max_mnt_count
))
603 es
->s_max_mnt_count
= cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT
);
604 es
->s_mnt_count
=cpu_to_le16(le16_to_cpu(es
->s_mnt_count
) + 1);
605 ext2_write_super(sb
);
606 if (test_opt (sb
, DEBUG
))
607 printk ("[EXT II FS %s, %s, bs=%lu, fs=%lu, gc=%lu, "
608 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
609 EXT2FS_VERSION
, EXT2FS_DATE
, sb
->s_blocksize
,
612 EXT2_BLOCKS_PER_GROUP(sb
),
613 EXT2_INODES_PER_GROUP(sb
),
618 static int ext2_check_descriptors(struct super_block
*sb
)
621 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
622 unsigned long first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
);
623 unsigned long last_block
;
625 ext2_debug ("Checking group descriptors");
627 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
628 struct ext2_group_desc
*gdp
= ext2_get_group_desc(sb
, i
, NULL
);
630 if (i
== sbi
->s_groups_count
- 1)
631 last_block
= le32_to_cpu(sbi
->s_es
->s_blocks_count
) - 1;
633 last_block
= first_block
+
634 (EXT2_BLOCKS_PER_GROUP(sb
) - 1);
636 if (le32_to_cpu(gdp
->bg_block_bitmap
) < first_block
||
637 le32_to_cpu(gdp
->bg_block_bitmap
) > last_block
)
639 ext2_error (sb
, "ext2_check_descriptors",
640 "Block bitmap for group %d"
641 " not in group (block %lu)!",
642 i
, (unsigned long) le32_to_cpu(gdp
->bg_block_bitmap
));
645 if (le32_to_cpu(gdp
->bg_inode_bitmap
) < first_block
||
646 le32_to_cpu(gdp
->bg_inode_bitmap
) > last_block
)
648 ext2_error (sb
, "ext2_check_descriptors",
649 "Inode bitmap for group %d"
650 " not in group (block %lu)!",
651 i
, (unsigned long) le32_to_cpu(gdp
->bg_inode_bitmap
));
654 if (le32_to_cpu(gdp
->bg_inode_table
) < first_block
||
655 le32_to_cpu(gdp
->bg_inode_table
) + sbi
->s_itb_per_group
- 1 >
658 ext2_error (sb
, "ext2_check_descriptors",
659 "Inode table for group %d"
660 " not in group (block %lu)!",
661 i
, (unsigned long) le32_to_cpu(gdp
->bg_inode_table
));
664 first_block
+= EXT2_BLOCKS_PER_GROUP(sb
);
670 * Maximal file size. There is a direct, and {,double-,triple-}indirect
671 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
672 * We need to be 1 filesystem block less than the 2^32 sector limit.
674 static loff_t
ext2_max_size(int bits
)
676 loff_t res
= EXT2_NDIR_BLOCKS
;
680 /* This is calculated to be the largest file size for a
681 * dense, file such that the total number of
682 * sectors in the file, including data and all indirect blocks,
683 * does not exceed 2^32 -1
684 * __u32 i_blocks representing the total number of
685 * 512 bytes blocks of the file
687 upper_limit
= (1LL << 32) - 1;
689 /* total blocks in file system block size */
690 upper_limit
>>= (bits
- 9);
693 /* indirect blocks */
695 /* double indirect blocks */
696 meta_blocks
+= 1 + (1LL << (bits
-2));
697 /* tripple indirect blocks */
698 meta_blocks
+= 1 + (1LL << (bits
-2)) + (1LL << (2*(bits
-2)));
700 upper_limit
-= meta_blocks
;
701 upper_limit
<<= bits
;
703 res
+= 1LL << (bits
-2);
704 res
+= 1LL << (2*(bits
-2));
705 res
+= 1LL << (3*(bits
-2));
707 if (res
> upper_limit
)
710 if (res
> MAX_LFS_FILESIZE
)
711 res
= MAX_LFS_FILESIZE
;
716 static unsigned long descriptor_loc(struct super_block
*sb
,
717 unsigned long logic_sb_block
,
720 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
721 unsigned long bg
, first_data_block
, first_meta_bg
;
724 first_data_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
);
725 first_meta_bg
= le32_to_cpu(sbi
->s_es
->s_first_meta_bg
);
727 if (!EXT2_HAS_INCOMPAT_FEATURE(sb
, EXT2_FEATURE_INCOMPAT_META_BG
) ||
729 return (logic_sb_block
+ nr
+ 1);
730 bg
= sbi
->s_desc_per_block
* nr
;
731 if (ext2_bg_has_super(sb
, bg
))
733 return (first_data_block
+ has_super
+ (bg
* sbi
->s_blocks_per_group
));
736 static int ext2_fill_super(struct super_block
*sb
, void *data
, int silent
)
738 struct buffer_head
* bh
;
739 struct ext2_sb_info
* sbi
;
740 struct ext2_super_block
* es
;
743 unsigned long sb_block
= get_sb_block(&data
);
744 unsigned long logic_sb_block
;
745 unsigned long offset
= 0;
746 unsigned long def_mount_opts
;
748 int blocksize
= BLOCK_SIZE
;
754 sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
758 sbi
->s_sb_block
= sb_block
;
761 * See what the current blocksize for the device is, and
762 * use that as the blocksize. Otherwise (or if the blocksize
763 * is smaller than the default) use the default.
764 * This is important for devices that have a hardware
765 * sectorsize that is larger than the default.
767 blocksize
= sb_min_blocksize(sb
, BLOCK_SIZE
);
769 printk ("EXT2-fs: unable to set blocksize\n");
774 * If the superblock doesn't start on a hardware sector boundary,
775 * calculate the offset.
777 if (blocksize
!= BLOCK_SIZE
) {
778 logic_sb_block
= (sb_block
*BLOCK_SIZE
) / blocksize
;
779 offset
= (sb_block
*BLOCK_SIZE
) % blocksize
;
781 logic_sb_block
= sb_block
;
784 if (!(bh
= sb_bread(sb
, logic_sb_block
))) {
785 printk ("EXT2-fs: unable to read superblock\n");
789 * Note: s_es must be initialized as soon as possible because
790 * some ext2 macro-instructions depend on its value
792 es
= (struct ext2_super_block
*) (((char *)bh
->b_data
) + offset
);
794 sb
->s_magic
= le16_to_cpu(es
->s_magic
);
796 if (sb
->s_magic
!= EXT2_SUPER_MAGIC
)
799 /* Set defaults before we parse the mount options */
800 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
801 if (def_mount_opts
& EXT2_DEFM_DEBUG
)
802 set_opt(sbi
->s_mount_opt
, DEBUG
);
803 if (def_mount_opts
& EXT2_DEFM_BSDGROUPS
)
804 set_opt(sbi
->s_mount_opt
, GRPID
);
805 if (def_mount_opts
& EXT2_DEFM_UID16
)
806 set_opt(sbi
->s_mount_opt
, NO_UID32
);
807 #ifdef CONFIG_EXT2_FS_XATTR
808 if (def_mount_opts
& EXT2_DEFM_XATTR_USER
)
809 set_opt(sbi
->s_mount_opt
, XATTR_USER
);
811 #ifdef CONFIG_EXT2_FS_POSIX_ACL
812 if (def_mount_opts
& EXT2_DEFM_ACL
)
813 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
816 if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT2_ERRORS_PANIC
)
817 set_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
818 else if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT2_ERRORS_CONTINUE
)
819 set_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
821 set_opt(sbi
->s_mount_opt
, ERRORS_RO
);
823 sbi
->s_resuid
= le16_to_cpu(es
->s_def_resuid
);
824 sbi
->s_resgid
= le16_to_cpu(es
->s_def_resgid
);
826 set_opt(sbi
->s_mount_opt
, RESERVATION
);
828 if (!parse_options ((char *) data
, sbi
))
831 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
832 ((EXT2_SB(sb
)->s_mount_opt
& EXT2_MOUNT_POSIX_ACL
) ?
835 ext2_xip_verify_sb(sb
); /* see if bdev supports xip, unset
836 EXT2_MOUNT_XIP if not */
838 if (le32_to_cpu(es
->s_rev_level
) == EXT2_GOOD_OLD_REV
&&
839 (EXT2_HAS_COMPAT_FEATURE(sb
, ~0U) ||
840 EXT2_HAS_RO_COMPAT_FEATURE(sb
, ~0U) ||
841 EXT2_HAS_INCOMPAT_FEATURE(sb
, ~0U)))
842 printk("EXT2-fs warning: feature flags set on rev 0 fs, "
843 "running e2fsck is recommended\n");
845 * Check feature flags regardless of the revision level, since we
846 * previously didn't change the revision level when setting the flags,
847 * so there is a chance incompat flags are set on a rev 0 filesystem.
849 features
= EXT2_HAS_INCOMPAT_FEATURE(sb
, ~EXT2_FEATURE_INCOMPAT_SUPP
);
851 printk("EXT2-fs: %s: couldn't mount because of "
852 "unsupported optional features (%x).\n",
853 sb
->s_id
, le32_to_cpu(features
));
856 if (!(sb
->s_flags
& MS_RDONLY
) &&
857 (features
= EXT2_HAS_RO_COMPAT_FEATURE(sb
, ~EXT2_FEATURE_RO_COMPAT_SUPP
))){
858 printk("EXT2-fs: %s: couldn't mount RDWR because of "
859 "unsupported optional features (%x).\n",
860 sb
->s_id
, le32_to_cpu(features
));
864 blocksize
= BLOCK_SIZE
<< le32_to_cpu(sbi
->s_es
->s_log_block_size
);
866 if (ext2_use_xip(sb
) && blocksize
!= PAGE_SIZE
) {
868 printk("XIP: Unsupported blocksize\n");
872 /* If the blocksize doesn't match, re-read the thing.. */
873 if (sb
->s_blocksize
!= blocksize
) {
876 if (!sb_set_blocksize(sb
, blocksize
)) {
877 printk(KERN_ERR
"EXT2-fs: blocksize too small for device.\n");
881 logic_sb_block
= (sb_block
*BLOCK_SIZE
) / blocksize
;
882 offset
= (sb_block
*BLOCK_SIZE
) % blocksize
;
883 bh
= sb_bread(sb
, logic_sb_block
);
885 printk("EXT2-fs: Couldn't read superblock on "
889 es
= (struct ext2_super_block
*) (((char *)bh
->b_data
) + offset
);
891 if (es
->s_magic
!= cpu_to_le16(EXT2_SUPER_MAGIC
)) {
892 printk ("EXT2-fs: Magic mismatch, very weird !\n");
897 sb
->s_maxbytes
= ext2_max_size(sb
->s_blocksize_bits
);
899 if (le32_to_cpu(es
->s_rev_level
) == EXT2_GOOD_OLD_REV
) {
900 sbi
->s_inode_size
= EXT2_GOOD_OLD_INODE_SIZE
;
901 sbi
->s_first_ino
= EXT2_GOOD_OLD_FIRST_INO
;
903 sbi
->s_inode_size
= le16_to_cpu(es
->s_inode_size
);
904 sbi
->s_first_ino
= le32_to_cpu(es
->s_first_ino
);
905 if ((sbi
->s_inode_size
< EXT2_GOOD_OLD_INODE_SIZE
) ||
906 !is_power_of_2(sbi
->s_inode_size
) ||
907 (sbi
->s_inode_size
> blocksize
)) {
908 printk ("EXT2-fs: unsupported inode size: %d\n",
914 sbi
->s_frag_size
= EXT2_MIN_FRAG_SIZE
<<
915 le32_to_cpu(es
->s_log_frag_size
);
916 if (sbi
->s_frag_size
== 0)
918 sbi
->s_frags_per_block
= sb
->s_blocksize
/ sbi
->s_frag_size
;
920 sbi
->s_blocks_per_group
= le32_to_cpu(es
->s_blocks_per_group
);
921 sbi
->s_frags_per_group
= le32_to_cpu(es
->s_frags_per_group
);
922 sbi
->s_inodes_per_group
= le32_to_cpu(es
->s_inodes_per_group
);
924 if (EXT2_INODE_SIZE(sb
) == 0)
926 sbi
->s_inodes_per_block
= sb
->s_blocksize
/ EXT2_INODE_SIZE(sb
);
927 if (sbi
->s_inodes_per_block
== 0 || sbi
->s_inodes_per_group
== 0)
929 sbi
->s_itb_per_group
= sbi
->s_inodes_per_group
/
930 sbi
->s_inodes_per_block
;
931 sbi
->s_desc_per_block
= sb
->s_blocksize
/
932 sizeof (struct ext2_group_desc
);
934 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
935 sbi
->s_addr_per_block_bits
=
936 ilog2 (EXT2_ADDR_PER_BLOCK(sb
));
937 sbi
->s_desc_per_block_bits
=
938 ilog2 (EXT2_DESC_PER_BLOCK(sb
));
940 if (sb
->s_magic
!= EXT2_SUPER_MAGIC
)
943 if (sb
->s_blocksize
!= bh
->b_size
) {
945 printk ("VFS: Unsupported blocksize on dev "
950 if (sb
->s_blocksize
!= sbi
->s_frag_size
) {
951 printk ("EXT2-fs: fragsize %lu != blocksize %lu (not supported yet)\n",
952 sbi
->s_frag_size
, sb
->s_blocksize
);
956 if (sbi
->s_blocks_per_group
> sb
->s_blocksize
* 8) {
957 printk ("EXT2-fs: #blocks per group too big: %lu\n",
958 sbi
->s_blocks_per_group
);
961 if (sbi
->s_frags_per_group
> sb
->s_blocksize
* 8) {
962 printk ("EXT2-fs: #fragments per group too big: %lu\n",
963 sbi
->s_frags_per_group
);
966 if (sbi
->s_inodes_per_group
> sb
->s_blocksize
* 8) {
967 printk ("EXT2-fs: #inodes per group too big: %lu\n",
968 sbi
->s_inodes_per_group
);
972 if (EXT2_BLOCKS_PER_GROUP(sb
) == 0)
974 sbi
->s_groups_count
= ((le32_to_cpu(es
->s_blocks_count
) -
975 le32_to_cpu(es
->s_first_data_block
) - 1)
976 / EXT2_BLOCKS_PER_GROUP(sb
)) + 1;
977 db_count
= (sbi
->s_groups_count
+ EXT2_DESC_PER_BLOCK(sb
) - 1) /
978 EXT2_DESC_PER_BLOCK(sb
);
979 sbi
->s_group_desc
= kmalloc (db_count
* sizeof (struct buffer_head
*), GFP_KERNEL
);
980 if (sbi
->s_group_desc
== NULL
) {
981 printk ("EXT2-fs: not enough memory\n");
984 bgl_lock_init(&sbi
->s_blockgroup_lock
);
985 sbi
->s_debts
= kcalloc(sbi
->s_groups_count
, sizeof(*sbi
->s_debts
), GFP_KERNEL
);
987 printk ("EXT2-fs: not enough memory\n");
988 goto failed_mount_group_desc
;
990 for (i
= 0; i
< db_count
; i
++) {
991 block
= descriptor_loc(sb
, logic_sb_block
, i
);
992 sbi
->s_group_desc
[i
] = sb_bread(sb
, block
);
993 if (!sbi
->s_group_desc
[i
]) {
994 for (j
= 0; j
< i
; j
++)
995 brelse (sbi
->s_group_desc
[j
]);
996 printk ("EXT2-fs: unable to read group descriptors\n");
997 goto failed_mount_group_desc
;
1000 if (!ext2_check_descriptors (sb
)) {
1001 printk ("EXT2-fs: group descriptors corrupted!\n");
1004 sbi
->s_gdb_count
= db_count
;
1005 get_random_bytes(&sbi
->s_next_generation
, sizeof(u32
));
1006 spin_lock_init(&sbi
->s_next_gen_lock
);
1008 /* per fileystem reservation list head & lock */
1009 spin_lock_init(&sbi
->s_rsv_window_lock
);
1010 sbi
->s_rsv_window_root
= RB_ROOT
;
1012 * Add a single, static dummy reservation to the start of the
1013 * reservation window list --- it gives us a placeholder for
1014 * append-at-start-of-list which makes the allocation logic
1017 sbi
->s_rsv_window_head
.rsv_start
= EXT2_RESERVE_WINDOW_NOT_ALLOCATED
;
1018 sbi
->s_rsv_window_head
.rsv_end
= EXT2_RESERVE_WINDOW_NOT_ALLOCATED
;
1019 sbi
->s_rsv_window_head
.rsv_alloc_hit
= 0;
1020 sbi
->s_rsv_window_head
.rsv_goal_size
= 0;
1021 ext2_rsv_window_add(sb
, &sbi
->s_rsv_window_head
);
1023 err
= percpu_counter_init(&sbi
->s_freeblocks_counter
,
1024 ext2_count_free_blocks(sb
));
1026 err
= percpu_counter_init(&sbi
->s_freeinodes_counter
,
1027 ext2_count_free_inodes(sb
));
1030 err
= percpu_counter_init(&sbi
->s_dirs_counter
,
1031 ext2_count_dirs(sb
));
1034 printk(KERN_ERR
"EXT2-fs: insufficient memory\n");
1038 * set up enough so that it can read an inode
1040 sb
->s_op
= &ext2_sops
;
1041 sb
->s_export_op
= &ext2_export_ops
;
1042 sb
->s_xattr
= ext2_xattr_handlers
;
1043 root
= ext2_iget(sb
, EXT2_ROOT_INO
);
1045 ret
= PTR_ERR(root
);
1048 if (!S_ISDIR(root
->i_mode
) || !root
->i_blocks
|| !root
->i_size
) {
1050 printk(KERN_ERR
"EXT2-fs: corrupt root inode, run e2fsck\n");
1054 sb
->s_root
= d_alloc_root(root
);
1057 printk(KERN_ERR
"EXT2-fs: get root inode failed\n");
1061 if (EXT2_HAS_COMPAT_FEATURE(sb
, EXT3_FEATURE_COMPAT_HAS_JOURNAL
))
1062 ext2_warning(sb
, __FUNCTION__
,
1063 "mounting ext3 filesystem as ext2");
1064 ext2_setup_super (sb
, es
, sb
->s_flags
& MS_RDONLY
);
1069 printk("VFS: Can't find an ext2 filesystem on dev %s.\n",
1073 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
1074 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
1075 percpu_counter_destroy(&sbi
->s_dirs_counter
);
1077 for (i
= 0; i
< db_count
; i
++)
1078 brelse(sbi
->s_group_desc
[i
]);
1079 failed_mount_group_desc
:
1080 kfree(sbi
->s_group_desc
);
1081 kfree(sbi
->s_debts
);
1085 sb
->s_fs_info
= NULL
;
1090 static void ext2_commit_super (struct super_block
* sb
,
1091 struct ext2_super_block
* es
)
1093 es
->s_wtime
= cpu_to_le32(get_seconds());
1094 mark_buffer_dirty(EXT2_SB(sb
)->s_sbh
);
1098 static void ext2_sync_super(struct super_block
*sb
, struct ext2_super_block
*es
)
1100 es
->s_free_blocks_count
= cpu_to_le32(ext2_count_free_blocks(sb
));
1101 es
->s_free_inodes_count
= cpu_to_le32(ext2_count_free_inodes(sb
));
1102 es
->s_wtime
= cpu_to_le32(get_seconds());
1103 mark_buffer_dirty(EXT2_SB(sb
)->s_sbh
);
1104 sync_dirty_buffer(EXT2_SB(sb
)->s_sbh
);
1109 * In the second extended file system, it is not necessary to
1110 * write the super block since we use a mapping of the
1111 * disk super block in a buffer.
1113 * However, this function is still used to set the fs valid
1114 * flags to 0. We need to set this flag to 0 since the fs
1115 * may have been checked while mounted and e2fsck may have
1116 * set s_state to EXT2_VALID_FS after some corrections.
1119 void ext2_write_super (struct super_block
* sb
)
1121 struct ext2_super_block
* es
;
1123 if (!(sb
->s_flags
& MS_RDONLY
)) {
1124 es
= EXT2_SB(sb
)->s_es
;
1126 if (le16_to_cpu(es
->s_state
) & EXT2_VALID_FS
) {
1127 ext2_debug ("setting valid to 0\n");
1128 es
->s_state
= cpu_to_le16(le16_to_cpu(es
->s_state
) &
1130 es
->s_free_blocks_count
= cpu_to_le32(ext2_count_free_blocks(sb
));
1131 es
->s_free_inodes_count
= cpu_to_le32(ext2_count_free_inodes(sb
));
1132 es
->s_mtime
= cpu_to_le32(get_seconds());
1133 ext2_sync_super(sb
, es
);
1135 ext2_commit_super (sb
, es
);
1141 static int ext2_remount (struct super_block
* sb
, int * flags
, char * data
)
1143 struct ext2_sb_info
* sbi
= EXT2_SB(sb
);
1144 struct ext2_super_block
* es
;
1145 unsigned long old_mount_opt
= sbi
->s_mount_opt
;
1146 struct ext2_mount_options old_opts
;
1147 unsigned long old_sb_flags
;
1150 /* Store the old options */
1151 old_sb_flags
= sb
->s_flags
;
1152 old_opts
.s_mount_opt
= sbi
->s_mount_opt
;
1153 old_opts
.s_resuid
= sbi
->s_resuid
;
1154 old_opts
.s_resgid
= sbi
->s_resgid
;
1157 * Allow the "check" option to be passed as a remount option.
1159 if (!parse_options (data
, sbi
)) {
1164 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
1165 ((sbi
->s_mount_opt
& EXT2_MOUNT_POSIX_ACL
) ? MS_POSIXACL
: 0);
1167 ext2_xip_verify_sb(sb
); /* see if bdev supports xip, unset
1168 EXT2_MOUNT_XIP if not */
1170 if ((ext2_use_xip(sb
)) && (sb
->s_blocksize
!= PAGE_SIZE
)) {
1171 printk("XIP: Unsupported blocksize\n");
1177 if (((sbi
->s_mount_opt
& EXT2_MOUNT_XIP
) !=
1178 (old_mount_opt
& EXT2_MOUNT_XIP
)) &&
1179 invalidate_inodes(sb
))
1180 ext2_warning(sb
, __FUNCTION__
, "busy inodes while remounting "\
1181 "xip remain in cache (no functional problem)");
1182 if ((*flags
& MS_RDONLY
) == (sb
->s_flags
& MS_RDONLY
))
1184 if (*flags
& MS_RDONLY
) {
1185 if (le16_to_cpu(es
->s_state
) & EXT2_VALID_FS
||
1186 !(sbi
->s_mount_state
& EXT2_VALID_FS
))
1189 * OK, we are remounting a valid rw partition rdonly, so set
1190 * the rdonly flag and then mark the partition as valid again.
1192 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
1193 es
->s_mtime
= cpu_to_le32(get_seconds());
1195 __le32 ret
= EXT2_HAS_RO_COMPAT_FEATURE(sb
,
1196 ~EXT2_FEATURE_RO_COMPAT_SUPP
);
1198 printk("EXT2-fs: %s: couldn't remount RDWR because of "
1199 "unsupported optional features (%x).\n",
1200 sb
->s_id
, le32_to_cpu(ret
));
1205 * Mounting a RDONLY partition read-write, so reread and
1206 * store the current valid flag. (It may have been changed
1207 * by e2fsck since we originally mounted the partition.)
1209 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
1210 if (!ext2_setup_super (sb
, es
, 0))
1211 sb
->s_flags
&= ~MS_RDONLY
;
1213 ext2_sync_super(sb
, es
);
1216 sbi
->s_mount_opt
= old_opts
.s_mount_opt
;
1217 sbi
->s_resuid
= old_opts
.s_resuid
;
1218 sbi
->s_resgid
= old_opts
.s_resgid
;
1219 sb
->s_flags
= old_sb_flags
;
1223 static int ext2_statfs (struct dentry
* dentry
, struct kstatfs
* buf
)
1225 struct super_block
*sb
= dentry
->d_sb
;
1226 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
1227 struct ext2_super_block
*es
= sbi
->s_es
;
1230 if (test_opt (sb
, MINIX_DF
))
1231 sbi
->s_overhead_last
= 0;
1232 else if (sbi
->s_blocks_last
!= le32_to_cpu(es
->s_blocks_count
)) {
1233 unsigned long i
, overhead
= 0;
1237 * Compute the overhead (FS structures). This is constant
1238 * for a given filesystem unless the number of block groups
1239 * changes so we cache the previous value until it does.
1243 * All of the blocks before first_data_block are
1246 overhead
= le32_to_cpu(es
->s_first_data_block
);
1249 * Add the overhead attributed to the superblock and
1250 * block group descriptors. If the sparse superblocks
1251 * feature is turned on, then not all groups have this.
1253 for (i
= 0; i
< sbi
->s_groups_count
; i
++)
1254 overhead
+= ext2_bg_has_super(sb
, i
) +
1255 ext2_bg_num_gdb(sb
, i
);
1258 * Every block group has an inode bitmap, a block
1259 * bitmap, and an inode table.
1261 overhead
+= (sbi
->s_groups_count
*
1262 (2 + sbi
->s_itb_per_group
));
1263 sbi
->s_overhead_last
= overhead
;
1265 sbi
->s_blocks_last
= le32_to_cpu(es
->s_blocks_count
);
1268 buf
->f_type
= EXT2_SUPER_MAGIC
;
1269 buf
->f_bsize
= sb
->s_blocksize
;
1270 buf
->f_blocks
= le32_to_cpu(es
->s_blocks_count
) - sbi
->s_overhead_last
;
1271 buf
->f_bfree
= ext2_count_free_blocks(sb
);
1272 es
->s_free_blocks_count
= cpu_to_le32(buf
->f_bfree
);
1273 buf
->f_bavail
= buf
->f_bfree
- le32_to_cpu(es
->s_r_blocks_count
);
1274 if (buf
->f_bfree
< le32_to_cpu(es
->s_r_blocks_count
))
1276 buf
->f_files
= le32_to_cpu(es
->s_inodes_count
);
1277 buf
->f_ffree
= ext2_count_free_inodes(sb
);
1278 es
->s_free_inodes_count
= cpu_to_le32(buf
->f_ffree
);
1279 buf
->f_namelen
= EXT2_NAME_LEN
;
1280 fsid
= le64_to_cpup((void *)es
->s_uuid
) ^
1281 le64_to_cpup((void *)es
->s_uuid
+ sizeof(u64
));
1282 buf
->f_fsid
.val
[0] = fsid
& 0xFFFFFFFFUL
;
1283 buf
->f_fsid
.val
[1] = (fsid
>> 32) & 0xFFFFFFFFUL
;
1287 static int ext2_get_sb(struct file_system_type
*fs_type
,
1288 int flags
, const char *dev_name
, void *data
, struct vfsmount
*mnt
)
1290 return get_sb_bdev(fs_type
, flags
, dev_name
, data
, ext2_fill_super
, mnt
);
1295 /* Read data from quotafile - avoid pagecache and such because we cannot afford
1296 * acquiring the locks... As quota files are never truncated and quota code
1297 * itself serializes the operations (and noone else should touch the files)
1298 * we don't have to be afraid of races */
1299 static ssize_t
ext2_quota_read(struct super_block
*sb
, int type
, char *data
,
1300 size_t len
, loff_t off
)
1302 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
1303 sector_t blk
= off
>> EXT2_BLOCK_SIZE_BITS(sb
);
1305 int offset
= off
& (sb
->s_blocksize
- 1);
1308 struct buffer_head tmp_bh
;
1309 struct buffer_head
*bh
;
1310 loff_t i_size
= i_size_read(inode
);
1314 if (off
+len
> i_size
)
1317 while (toread
> 0) {
1318 tocopy
= sb
->s_blocksize
- offset
< toread
?
1319 sb
->s_blocksize
- offset
: toread
;
1322 err
= ext2_get_block(inode
, blk
, &tmp_bh
, 0);
1325 if (!buffer_mapped(&tmp_bh
)) /* A hole? */
1326 memset(data
, 0, tocopy
);
1328 bh
= sb_bread(sb
, tmp_bh
.b_blocknr
);
1331 memcpy(data
, bh
->b_data
+offset
, tocopy
);
1342 /* Write to quotafile */
1343 static ssize_t
ext2_quota_write(struct super_block
*sb
, int type
,
1344 const char *data
, size_t len
, loff_t off
)
1346 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
1347 sector_t blk
= off
>> EXT2_BLOCK_SIZE_BITS(sb
);
1349 int offset
= off
& (sb
->s_blocksize
- 1);
1351 size_t towrite
= len
;
1352 struct buffer_head tmp_bh
;
1353 struct buffer_head
*bh
;
1355 mutex_lock_nested(&inode
->i_mutex
, I_MUTEX_QUOTA
);
1356 while (towrite
> 0) {
1357 tocopy
= sb
->s_blocksize
- offset
< towrite
?
1358 sb
->s_blocksize
- offset
: towrite
;
1361 err
= ext2_get_block(inode
, blk
, &tmp_bh
, 1);
1364 if (offset
|| tocopy
!= EXT2_BLOCK_SIZE(sb
))
1365 bh
= sb_bread(sb
, tmp_bh
.b_blocknr
);
1367 bh
= sb_getblk(sb
, tmp_bh
.b_blocknr
);
1373 memcpy(bh
->b_data
+offset
, data
, tocopy
);
1374 flush_dcache_page(bh
->b_page
);
1375 set_buffer_uptodate(bh
);
1376 mark_buffer_dirty(bh
);
1387 if (inode
->i_size
< off
+len
-towrite
)
1388 i_size_write(inode
, off
+len
-towrite
);
1390 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
1391 mark_inode_dirty(inode
);
1392 mutex_unlock(&inode
->i_mutex
);
1393 return len
- towrite
;
1398 static struct file_system_type ext2_fs_type
= {
1399 .owner
= THIS_MODULE
,
1401 .get_sb
= ext2_get_sb
,
1402 .kill_sb
= kill_block_super
,
1403 .fs_flags
= FS_REQUIRES_DEV
,
1406 static int __init
init_ext2_fs(void)
1408 int err
= init_ext2_xattr();
1411 err
= init_inodecache();
1414 err
= register_filesystem(&ext2_fs_type
);
1419 destroy_inodecache();
1425 static void __exit
exit_ext2_fs(void)
1427 unregister_filesystem(&ext2_fs_type
);
1428 destroy_inodecache();
1432 module_init(init_ext2_fs
)
1433 module_exit(exit_ext2_fs
)