2 * linux/fs/affs/inode.c
4 * (c) 1996 Hans-Joachim Widmaier - Rewritten
6 * (C) 1993 Ray Burr - Modified for Amiga FFS filesystem.
8 * (C) 1992 Eric Youngdale Modified for ISO 9660 filesystem.
10 * (C) 1991 Linus Torvalds - minix filesystem
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/statfs.h>
16 #include <linux/parser.h>
17 #include <linux/magic.h>
18 #include <linux/sched.h>
19 #include <linux/cred.h>
20 #include <linux/slab.h>
21 #include <linux/writeback.h>
22 #include <linux/blkdev.h>
25 static int affs_statfs(struct dentry
*dentry
, struct kstatfs
*buf
);
26 static int affs_remount (struct super_block
*sb
, int *flags
, char *data
);
29 affs_commit_super(struct super_block
*sb
, int wait
)
31 struct affs_sb_info
*sbi
= AFFS_SB(sb
);
32 struct buffer_head
*bh
= sbi
->s_root_bh
;
33 struct affs_root_tail
*tail
= AFFS_ROOT_TAIL(sb
, bh
);
36 affs_secs_to_datestamp(ktime_get_real_seconds(), &tail
->disk_change
);
37 affs_fix_checksum(sb
, bh
);
40 mark_buffer_dirty(bh
);
42 sync_dirty_buffer(bh
);
46 affs_put_super(struct super_block
*sb
)
48 struct affs_sb_info
*sbi
= AFFS_SB(sb
);
49 pr_debug("%s()\n", __func__
);
51 cancel_delayed_work_sync(&sbi
->sb_work
);
55 affs_sync_fs(struct super_block
*sb
, int wait
)
57 affs_commit_super(sb
, wait
);
61 static void flush_superblock(struct work_struct
*work
)
63 struct affs_sb_info
*sbi
;
64 struct super_block
*sb
;
66 sbi
= container_of(work
, struct affs_sb_info
, sb_work
.work
);
69 spin_lock(&sbi
->work_lock
);
71 spin_unlock(&sbi
->work_lock
);
73 affs_commit_super(sb
, 1);
76 void affs_mark_sb_dirty(struct super_block
*sb
)
78 struct affs_sb_info
*sbi
= AFFS_SB(sb
);
81 if (sb
->s_flags
& MS_RDONLY
)
84 spin_lock(&sbi
->work_lock
);
85 if (!sbi
->work_queued
) {
86 delay
= msecs_to_jiffies(dirty_writeback_interval
* 10);
87 queue_delayed_work(system_long_wq
, &sbi
->sb_work
, delay
);
90 spin_unlock(&sbi
->work_lock
);
93 static struct kmem_cache
* affs_inode_cachep
;
95 static struct inode
*affs_alloc_inode(struct super_block
*sb
)
97 struct affs_inode_info
*i
;
99 i
= kmem_cache_alloc(affs_inode_cachep
, GFP_KERNEL
);
103 i
->vfs_inode
.i_version
= 1;
108 return &i
->vfs_inode
;
111 static void affs_i_callback(struct rcu_head
*head
)
113 struct inode
*inode
= container_of(head
, struct inode
, i_rcu
);
114 kmem_cache_free(affs_inode_cachep
, AFFS_I(inode
));
117 static void affs_destroy_inode(struct inode
*inode
)
119 call_rcu(&inode
->i_rcu
, affs_i_callback
);
122 static void init_once(void *foo
)
124 struct affs_inode_info
*ei
= (struct affs_inode_info
*) foo
;
126 sema_init(&ei
->i_link_lock
, 1);
127 sema_init(&ei
->i_ext_lock
, 1);
128 inode_init_once(&ei
->vfs_inode
);
131 static int __init
init_inodecache(void)
133 affs_inode_cachep
= kmem_cache_create("affs_inode_cache",
134 sizeof(struct affs_inode_info
),
135 0, (SLAB_RECLAIM_ACCOUNT
|
136 SLAB_MEM_SPREAD
|SLAB_ACCOUNT
),
138 if (affs_inode_cachep
== NULL
)
143 static void destroy_inodecache(void)
146 * Make sure all delayed rcu free inodes are flushed before we
150 kmem_cache_destroy(affs_inode_cachep
);
153 static const struct super_operations affs_sops
= {
154 .alloc_inode
= affs_alloc_inode
,
155 .destroy_inode
= affs_destroy_inode
,
156 .write_inode
= affs_write_inode
,
157 .evict_inode
= affs_evict_inode
,
158 .put_super
= affs_put_super
,
159 .sync_fs
= affs_sync_fs
,
160 .statfs
= affs_statfs
,
161 .remount_fs
= affs_remount
,
162 .show_options
= generic_show_options
,
166 Opt_bs
, Opt_mode
, Opt_mufs
, Opt_notruncate
, Opt_prefix
, Opt_protect
,
167 Opt_reserved
, Opt_root
, Opt_setgid
, Opt_setuid
,
168 Opt_verbose
, Opt_volume
, Opt_ignore
, Opt_err
,
171 static const match_table_t tokens
= {
173 {Opt_mode
, "mode=%o"},
175 {Opt_notruncate
, "nofilenametruncate"},
176 {Opt_prefix
, "prefix=%s"},
177 {Opt_protect
, "protect"},
178 {Opt_reserved
, "reserved=%u"},
179 {Opt_root
, "root=%u"},
180 {Opt_setgid
, "setgid=%u"},
181 {Opt_setuid
, "setuid=%u"},
182 {Opt_verbose
, "verbose"},
183 {Opt_volume
, "volume=%s"},
184 {Opt_ignore
, "grpquota"},
185 {Opt_ignore
, "noquota"},
186 {Opt_ignore
, "quota"},
187 {Opt_ignore
, "usrquota"},
192 parse_options(char *options
, kuid_t
*uid
, kgid_t
*gid
, int *mode
, int *reserved
, s32
*root
,
193 int *blocksize
, char **prefix
, char *volume
, unsigned long *mount_opts
)
196 substring_t args
[MAX_OPT_ARGS
];
198 /* Fill in defaults */
200 *uid
= current_uid();
201 *gid
= current_gid();
211 while ((p
= strsep(&options
, ",")) != NULL
) {
212 int token
, n
, option
;
216 token
= match_token(p
, tokens
, args
);
219 if (match_int(&args
[0], &n
))
221 if (n
!= 512 && n
!= 1024 && n
!= 2048
223 pr_warn("Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
229 if (match_octal(&args
[0], &option
))
231 *mode
= option
& 0777;
232 affs_set_opt(*mount_opts
, SF_SETMODE
);
235 affs_set_opt(*mount_opts
, SF_MUFS
);
238 affs_set_opt(*mount_opts
, SF_NO_TRUNCATE
);
241 *prefix
= match_strdup(&args
[0]);
244 affs_set_opt(*mount_opts
, SF_PREFIX
);
247 affs_set_opt(*mount_opts
, SF_IMMUTABLE
);
250 if (match_int(&args
[0], reserved
))
254 if (match_int(&args
[0], root
))
258 if (match_int(&args
[0], &option
))
260 *gid
= make_kgid(current_user_ns(), option
);
261 if (!gid_valid(*gid
))
263 affs_set_opt(*mount_opts
, SF_SETGID
);
266 if (match_int(&args
[0], &option
))
268 *uid
= make_kuid(current_user_ns(), option
);
269 if (!uid_valid(*uid
))
271 affs_set_opt(*mount_opts
, SF_SETUID
);
274 affs_set_opt(*mount_opts
, SF_VERBOSE
);
277 char *vol
= match_strdup(&args
[0]);
280 strlcpy(volume
, vol
, 32);
285 /* Silently ignore the quota options */
288 pr_warn("Unrecognized mount option \"%s\" or missing value\n",
296 /* This function definitely needs to be split up. Some fine day I'll
297 * hopefully have the guts to do so. Until then: sorry for the mess.
300 static int affs_fill_super(struct super_block
*sb
, void *data
, int silent
)
302 struct affs_sb_info
*sbi
;
303 struct buffer_head
*root_bh
= NULL
;
304 struct buffer_head
*boot_bh
;
305 struct inode
*root_inode
= NULL
;
314 unsigned long mount_flags
;
315 int tmp_flags
; /* fix remount prototype... */
319 save_mount_options(sb
, data
);
321 pr_debug("read_super(%s)\n", data
? (const char *)data
: "no options");
323 sb
->s_magic
= AFFS_SUPER_MAGIC
;
324 sb
->s_op
= &affs_sops
;
325 sb
->s_flags
|= MS_NODIRATIME
;
327 sbi
= kzalloc(sizeof(struct affs_sb_info
), GFP_KERNEL
);
333 mutex_init(&sbi
->s_bmlock
);
334 spin_lock_init(&sbi
->symlink_lock
);
335 spin_lock_init(&sbi
->work_lock
);
336 INIT_DELAYED_WORK(&sbi
->sb_work
, flush_superblock
);
338 if (!parse_options(data
,&uid
,&gid
,&i
,&reserved
,&root_block
,
339 &blocksize
,&sbi
->s_prefix
,
340 sbi
->s_volume
, &mount_flags
)) {
341 pr_err("Error parsing options\n");
344 /* N.B. after this point s_prefix must be released */
346 sbi
->s_flags
= mount_flags
;
350 sbi
->s_reserved
= reserved
;
352 /* Get the size of the device in 512-byte blocks.
353 * If we later see that the partition uses bigger
354 * blocks, we will have to change it.
357 size
= i_size_read(sb
->s_bdev
->bd_inode
) >> 9;
358 pr_debug("initial blocksize=%d, #blocks=%d\n", 512, size
);
360 affs_set_blocksize(sb
, PAGE_SIZE
);
361 /* Try to find root block. Its location depends on the block size. */
363 i
= bdev_logical_block_size(sb
->s_bdev
);
367 size
= size
/ (blocksize
/ 512);
370 for (blocksize
= i
; blocksize
<= j
; blocksize
<<= 1, size
>>= 1) {
371 sbi
->s_root_block
= root_block
;
373 sbi
->s_root_block
= (reserved
+ size
- 1) / 2;
374 pr_debug("setting blocksize to %d\n", blocksize
);
375 affs_set_blocksize(sb
, blocksize
);
376 sbi
->s_partition_size
= size
;
378 /* The root block location that was calculated above is not
379 * correct if the partition size is an odd number of 512-
380 * byte blocks, which will be rounded down to a number of
381 * 1024-byte blocks, and if there were an even number of
382 * reserved blocks. Ideally, all partition checkers should
383 * report the real number of blocks of the real blocksize,
384 * but since this just cannot be done, we have to try to
385 * find the root block anyways. In the above case, it is one
386 * block behind the calculated one. So we check this one, too.
388 for (num_bm
= 0; num_bm
< 2; num_bm
++) {
389 pr_debug("Dev %s, trying root=%u, bs=%d, "
390 "size=%d, reserved=%d\n",
392 sbi
->s_root_block
+ num_bm
,
393 blocksize
, size
, reserved
);
394 root_bh
= affs_bread(sb
, sbi
->s_root_block
+ num_bm
);
397 if (!affs_checksum_block(sb
, root_bh
) &&
398 be32_to_cpu(AFFS_ROOT_HEAD(root_bh
)->ptype
) == T_SHORT
&&
399 be32_to_cpu(AFFS_ROOT_TAIL(sb
, root_bh
)->stype
) == ST_ROOT
) {
400 sbi
->s_hashsize
= blocksize
/ 4 - 56;
401 sbi
->s_root_block
+= num_bm
;
404 affs_brelse(root_bh
);
409 pr_err("No valid root block on device %s\n", sb
->s_id
);
412 /* N.B. after this point bh must be released */
414 /* Keep super block in cache */
415 sbi
->s_root_bh
= root_bh
;
416 root_block
= sbi
->s_root_block
;
418 /* Find out which kind of FS we have */
419 boot_bh
= sb_bread(sb
, 0);
421 pr_err("Cannot read boot block\n");
424 memcpy(sig
, boot_bh
->b_data
, 4);
426 chksum
= be32_to_cpu(*(__be32
*)sig
);
428 /* Dircache filesystems are compatible with non-dircache ones
429 * when reading. As long as they aren't supported, writing is
432 if ((chksum
== FS_DCFFS
|| chksum
== MUFS_DCFFS
|| chksum
== FS_DCOFS
433 || chksum
== MUFS_DCOFS
) && !(sb
->s_flags
& MS_RDONLY
)) {
434 pr_notice("Dircache FS - mounting %s read only\n", sb
->s_id
);
435 sb
->s_flags
|= MS_RDONLY
;
441 affs_set_opt(sbi
->s_flags
, SF_MUFS
);
445 affs_set_opt(sbi
->s_flags
, SF_INTL
);
448 affs_set_opt(sbi
->s_flags
, SF_MUFS
);
453 affs_set_opt(sbi
->s_flags
, SF_MUFS
);
456 affs_set_opt(sbi
->s_flags
, SF_OFS
);
457 sb
->s_flags
|= MS_NOEXEC
;
461 affs_set_opt(sbi
->s_flags
, SF_MUFS
);
464 affs_set_opt(sbi
->s_flags
, SF_INTL
);
465 affs_set_opt(sbi
->s_flags
, SF_OFS
);
466 sb
->s_flags
|= MS_NOEXEC
;
469 pr_err("Unknown filesystem on device %s: %08X\n",
474 if (affs_test_opt(mount_flags
, SF_VERBOSE
)) {
475 u8 len
= AFFS_ROOT_TAIL(sb
, root_bh
)->disk_name
[0];
476 pr_notice("Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
478 AFFS_ROOT_TAIL(sb
, root_bh
)->disk_name
+ 1,
479 sig
, sig
[3] + '0', blocksize
);
482 sb
->s_flags
|= MS_NODEV
| MS_NOSUID
;
484 sbi
->s_data_blksize
= sb
->s_blocksize
;
485 if (affs_test_opt(sbi
->s_flags
, SF_OFS
))
486 sbi
->s_data_blksize
-= 24;
488 tmp_flags
= sb
->s_flags
;
489 ret
= affs_init_bitmap(sb
, &tmp_flags
);
492 sb
->s_flags
= tmp_flags
;
494 /* set up enough so that it can read an inode */
496 root_inode
= affs_iget(sb
, root_block
);
497 if (IS_ERR(root_inode
))
498 return PTR_ERR(root_inode
);
500 if (affs_test_opt(AFFS_SB(sb
)->s_flags
, SF_INTL
))
501 sb
->s_d_op
= &affs_intl_dentry_operations
;
503 sb
->s_d_op
= &affs_dentry_operations
;
505 sb
->s_root
= d_make_root(root_inode
);
507 pr_err("AFFS: Get root inode failed\n");
511 sb
->s_export_op
= &affs_export_ops
;
512 pr_debug("s_flags=%lX\n", sb
->s_flags
);
517 affs_remount(struct super_block
*sb
, int *flags
, char *data
)
519 struct affs_sb_info
*sbi
= AFFS_SB(sb
);
526 unsigned long mount_flags
;
532 new_opts
= kstrdup(data
, GFP_KERNEL
);
533 if (data
&& !new_opts
)
536 pr_debug("%s(flags=0x%x,opts=\"%s\")\n", __func__
, *flags
, data
);
539 *flags
|= MS_NODIRATIME
;
541 memcpy(volume
, sbi
->s_volume
, 32);
542 if (!parse_options(data
, &uid
, &gid
, &mode
, &reserved
, &root_block
,
543 &blocksize
, &prefix
, volume
,
550 flush_delayed_work(&sbi
->sb_work
);
552 replace_mount_options(sb
, new_opts
);
554 sbi
->s_flags
= mount_flags
;
558 /* protect against readers */
559 spin_lock(&sbi
->symlink_lock
);
561 kfree(sbi
->s_prefix
);
562 sbi
->s_prefix
= prefix
;
564 memcpy(sbi
->s_volume
, volume
, 32);
565 spin_unlock(&sbi
->symlink_lock
);
567 if ((*flags
& MS_RDONLY
) == (sb
->s_flags
& MS_RDONLY
))
570 if (*flags
& MS_RDONLY
)
571 affs_free_bitmap(sb
);
573 res
= affs_init_bitmap(sb
, flags
);
579 affs_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
581 struct super_block
*sb
= dentry
->d_sb
;
583 u64 id
= huge_encode_dev(sb
->s_bdev
->bd_dev
);
585 pr_debug("%s() partsize=%d, reserved=%d\n",
586 __func__
, AFFS_SB(sb
)->s_partition_size
,
587 AFFS_SB(sb
)->s_reserved
);
589 free
= affs_count_free_blocks(sb
);
590 buf
->f_type
= AFFS_SUPER_MAGIC
;
591 buf
->f_bsize
= sb
->s_blocksize
;
592 buf
->f_blocks
= AFFS_SB(sb
)->s_partition_size
- AFFS_SB(sb
)->s_reserved
;
594 buf
->f_bavail
= free
;
595 buf
->f_fsid
.val
[0] = (u32
)id
;
596 buf
->f_fsid
.val
[1] = (u32
)(id
>> 32);
597 buf
->f_namelen
= AFFSNAMEMAX
;
601 static struct dentry
*affs_mount(struct file_system_type
*fs_type
,
602 int flags
, const char *dev_name
, void *data
)
604 return mount_bdev(fs_type
, flags
, dev_name
, data
, affs_fill_super
);
607 static void affs_kill_sb(struct super_block
*sb
)
609 struct affs_sb_info
*sbi
= AFFS_SB(sb
);
610 kill_block_super(sb
);
612 affs_free_bitmap(sb
);
613 affs_brelse(sbi
->s_root_bh
);
614 kfree(sbi
->s_prefix
);
615 mutex_destroy(&sbi
->s_bmlock
);
620 static struct file_system_type affs_fs_type
= {
621 .owner
= THIS_MODULE
,
624 .kill_sb
= affs_kill_sb
,
625 .fs_flags
= FS_REQUIRES_DEV
,
627 MODULE_ALIAS_FS("affs");
629 static int __init
init_affs_fs(void)
631 int err
= init_inodecache();
634 err
= register_filesystem(&affs_fs_type
);
639 destroy_inodecache();
644 static void __exit
exit_affs_fs(void)
646 unregister_filesystem(&affs_fs_type
);
647 destroy_inodecache();
650 MODULE_DESCRIPTION("Amiga filesystem support for Linux");
651 MODULE_LICENSE("GPL");
653 module_init(init_affs_fs
)
654 module_exit(exit_affs_fs
)