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>
21 extern struct timezone sys_tz
;
23 static int affs_statfs(struct dentry
*dentry
, struct kstatfs
*buf
);
24 static int affs_remount (struct super_block
*sb
, int *flags
, char *data
);
27 affs_put_super(struct super_block
*sb
)
29 struct affs_sb_info
*sbi
= AFFS_SB(sb
);
30 pr_debug("AFFS: put_super()\n");
34 if (!(sb
->s_flags
& MS_RDONLY
)) {
35 AFFS_ROOT_TAIL(sb
, sbi
->s_root_bh
)->bm_flag
= cpu_to_be32(1);
36 secs_to_datestamp(get_seconds(),
37 &AFFS_ROOT_TAIL(sb
, sbi
->s_root_bh
)->disk_change
);
38 affs_fix_checksum(sb
, sbi
->s_root_bh
);
39 mark_buffer_dirty(sbi
->s_root_bh
);
44 affs_brelse(sbi
->s_root_bh
);
52 affs_write_super(struct super_block
*sb
)
55 struct affs_sb_info
*sbi
= AFFS_SB(sb
);
57 if (!(sb
->s_flags
& MS_RDONLY
)) {
58 // if (sbi->s_bitmap[i].bm_bh) {
59 // if (buffer_dirty(sbi->s_bitmap[i].bm_bh)) {
61 AFFS_ROOT_TAIL(sb
, sbi
->s_root_bh
)->bm_flag
= cpu_to_be32(clean
);
62 secs_to_datestamp(get_seconds(),
63 &AFFS_ROOT_TAIL(sb
, sbi
->s_root_bh
)->disk_change
);
64 affs_fix_checksum(sb
, sbi
->s_root_bh
);
65 mark_buffer_dirty(sbi
->s_root_bh
);
66 sb
->s_dirt
= !clean
; /* redo until bitmap synced */
70 pr_debug("AFFS: write_super() at %lu, clean=%d\n", get_seconds(), clean
);
73 static struct kmem_cache
* affs_inode_cachep
;
75 static struct inode
*affs_alloc_inode(struct super_block
*sb
)
77 struct affs_inode_info
*i
;
79 i
= kmem_cache_alloc(affs_inode_cachep
, GFP_KERNEL
);
83 i
->vfs_inode
.i_version
= 1;
91 static void affs_destroy_inode(struct inode
*inode
)
93 kmem_cache_free(affs_inode_cachep
, AFFS_I(inode
));
96 static void init_once(void *foo
)
98 struct affs_inode_info
*ei
= (struct affs_inode_info
*) foo
;
100 init_MUTEX(&ei
->i_link_lock
);
101 init_MUTEX(&ei
->i_ext_lock
);
102 inode_init_once(&ei
->vfs_inode
);
105 static int init_inodecache(void)
107 affs_inode_cachep
= kmem_cache_create("affs_inode_cache",
108 sizeof(struct affs_inode_info
),
109 0, (SLAB_RECLAIM_ACCOUNT
|
112 if (affs_inode_cachep
== NULL
)
117 static void destroy_inodecache(void)
119 kmem_cache_destroy(affs_inode_cachep
);
122 static const struct super_operations affs_sops
= {
123 .alloc_inode
= affs_alloc_inode
,
124 .destroy_inode
= affs_destroy_inode
,
125 .write_inode
= affs_write_inode
,
126 .delete_inode
= affs_delete_inode
,
127 .clear_inode
= affs_clear_inode
,
128 .put_super
= affs_put_super
,
129 .write_super
= affs_write_super
,
130 .statfs
= affs_statfs
,
131 .remount_fs
= affs_remount
,
132 .show_options
= generic_show_options
,
136 Opt_bs
, Opt_mode
, Opt_mufs
, Opt_prefix
, Opt_protect
,
137 Opt_reserved
, Opt_root
, Opt_setgid
, Opt_setuid
,
138 Opt_verbose
, Opt_volume
, Opt_ignore
, Opt_err
,
141 static const match_table_t tokens
= {
143 {Opt_mode
, "mode=%o"},
145 {Opt_prefix
, "prefix=%s"},
146 {Opt_protect
, "protect"},
147 {Opt_reserved
, "reserved=%u"},
148 {Opt_root
, "root=%u"},
149 {Opt_setgid
, "setgid=%u"},
150 {Opt_setuid
, "setuid=%u"},
151 {Opt_verbose
, "verbose"},
152 {Opt_volume
, "volume=%s"},
153 {Opt_ignore
, "grpquota"},
154 {Opt_ignore
, "noquota"},
155 {Opt_ignore
, "quota"},
156 {Opt_ignore
, "usrquota"},
161 parse_options(char *options
, uid_t
*uid
, gid_t
*gid
, int *mode
, int *reserved
, s32
*root
,
162 int *blocksize
, char **prefix
, char *volume
, unsigned long *mount_opts
)
165 substring_t args
[MAX_OPT_ARGS
];
167 /* Fill in defaults */
169 *uid
= current_uid();
170 *gid
= current_gid();
180 while ((p
= strsep(&options
, ",")) != NULL
) {
181 int token
, n
, option
;
185 token
= match_token(p
, tokens
, args
);
188 if (match_int(&args
[0], &n
))
190 if (n
!= 512 && n
!= 1024 && n
!= 2048
192 printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
198 if (match_octal(&args
[0], &option
))
200 *mode
= option
& 0777;
201 *mount_opts
|= SF_SETMODE
;
204 *mount_opts
|= SF_MUFS
;
207 /* Free any previous prefix */
209 *prefix
= match_strdup(&args
[0]);
212 *mount_opts
|= SF_PREFIX
;
215 *mount_opts
|= SF_IMMUTABLE
;
218 if (match_int(&args
[0], reserved
))
222 if (match_int(&args
[0], root
))
226 if (match_int(&args
[0], &option
))
229 *mount_opts
|= SF_SETGID
;
232 if (match_int(&args
[0], &option
))
235 *mount_opts
|= SF_SETUID
;
238 *mount_opts
|= SF_VERBOSE
;
241 char *vol
= match_strdup(&args
[0]);
244 strlcpy(volume
, vol
, 32);
249 /* Silently ignore the quota options */
252 printk("AFFS: Unrecognized mount option \"%s\" "
253 "or missing value\n", p
);
260 /* This function definitely needs to be split up. Some fine day I'll
261 * hopefully have the guts to do so. Until then: sorry for the mess.
264 static int affs_fill_super(struct super_block
*sb
, void *data
, int silent
)
266 struct affs_sb_info
*sbi
;
267 struct buffer_head
*root_bh
= NULL
;
268 struct buffer_head
*boot_bh
;
269 struct inode
*root_inode
= NULL
;
279 unsigned long mount_flags
;
280 int tmp_flags
; /* fix remount prototype... */
284 save_mount_options(sb
, data
);
286 pr_debug("AFFS: read_super(%s)\n",data
? (const char *)data
: "no options");
288 sb
->s_magic
= AFFS_SUPER_MAGIC
;
289 sb
->s_op
= &affs_sops
;
290 sb
->s_flags
|= MS_NODIRATIME
;
292 sbi
= kzalloc(sizeof(struct affs_sb_info
), GFP_KERNEL
);
296 mutex_init(&sbi
->s_bmlock
);
298 if (!parse_options(data
,&uid
,&gid
,&i
,&reserved
,&root_block
,
299 &blocksize
,&sbi
->s_prefix
,
300 sbi
->s_volume
, &mount_flags
)) {
301 printk(KERN_ERR
"AFFS: Error parsing options\n");
304 /* N.B. after this point s_prefix must be released */
306 sbi
->s_flags
= mount_flags
;
310 sbi
->s_reserved
= reserved
;
312 /* Get the size of the device in 512-byte blocks.
313 * If we later see that the partition uses bigger
314 * blocks, we will have to change it.
317 size
= sb
->s_bdev
->bd_inode
->i_size
>> 9;
318 pr_debug("AFFS: initial blocksize=%d, #blocks=%d\n", 512, size
);
320 affs_set_blocksize(sb
, PAGE_SIZE
);
321 /* Try to find root block. Its location depends on the block size. */
327 size
= size
/ (blocksize
/ 512);
329 for (blocksize
= i
, key
= 0; blocksize
<= j
; blocksize
<<= 1, size
>>= 1) {
330 sbi
->s_root_block
= root_block
;
332 sbi
->s_root_block
= (reserved
+ size
- 1) / 2;
333 pr_debug("AFFS: setting blocksize to %d\n", blocksize
);
334 affs_set_blocksize(sb
, blocksize
);
335 sbi
->s_partition_size
= size
;
337 /* The root block location that was calculated above is not
338 * correct if the partition size is an odd number of 512-
339 * byte blocks, which will be rounded down to a number of
340 * 1024-byte blocks, and if there were an even number of
341 * reserved blocks. Ideally, all partition checkers should
342 * report the real number of blocks of the real blocksize,
343 * but since this just cannot be done, we have to try to
344 * find the root block anyways. In the above case, it is one
345 * block behind the calculated one. So we check this one, too.
347 for (num_bm
= 0; num_bm
< 2; num_bm
++) {
348 pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, "
349 "size=%d, reserved=%d\n",
351 sbi
->s_root_block
+ num_bm
,
352 blocksize
, size
, reserved
);
353 root_bh
= affs_bread(sb
, sbi
->s_root_block
+ num_bm
);
356 if (!affs_checksum_block(sb
, root_bh
) &&
357 be32_to_cpu(AFFS_ROOT_HEAD(root_bh
)->ptype
) == T_SHORT
&&
358 be32_to_cpu(AFFS_ROOT_TAIL(sb
, root_bh
)->stype
) == ST_ROOT
) {
359 sbi
->s_hashsize
= blocksize
/ 4 - 56;
360 sbi
->s_root_block
+= num_bm
;
364 affs_brelse(root_bh
);
369 printk(KERN_ERR
"AFFS: No valid root block on device %s\n",
373 /* N.B. after this point bh must be released */
375 root_block
= sbi
->s_root_block
;
377 /* Find out which kind of FS we have */
378 boot_bh
= sb_bread(sb
, 0);
380 printk(KERN_ERR
"AFFS: Cannot read boot block\n");
383 memcpy(sig
, boot_bh
->b_data
, 4);
385 chksum
= be32_to_cpu(*(__be32
*)sig
);
387 /* Dircache filesystems are compatible with non-dircache ones
388 * when reading. As long as they aren't supported, writing is
391 if ((chksum
== FS_DCFFS
|| chksum
== MUFS_DCFFS
|| chksum
== FS_DCOFS
392 || chksum
== MUFS_DCOFS
) && !(sb
->s_flags
& MS_RDONLY
)) {
393 printk(KERN_NOTICE
"AFFS: Dircache FS - mounting %s read only\n",
395 sb
->s_flags
|= MS_RDONLY
;
401 sbi
->s_flags
|= SF_MUFS
;
405 sbi
->s_flags
|= SF_INTL
;
408 sbi
->s_flags
|= SF_MUFS
;
413 sbi
->s_flags
|= SF_MUFS
;
416 sbi
->s_flags
|= SF_OFS
;
417 sb
->s_flags
|= MS_NOEXEC
;
421 sbi
->s_flags
|= SF_MUFS
;
424 sbi
->s_flags
|= SF_INTL
| SF_OFS
;
425 sb
->s_flags
|= MS_NOEXEC
;
428 printk(KERN_ERR
"AFFS: Unknown filesystem on device %s: %08X\n",
433 if (mount_flags
& SF_VERBOSE
) {
434 u8 len
= AFFS_ROOT_TAIL(sb
, root_bh
)->disk_name
[0];
435 printk(KERN_NOTICE
"AFFS: Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
437 AFFS_ROOT_TAIL(sb
, root_bh
)->disk_name
+ 1,
438 sig
, sig
[3] + '0', blocksize
);
441 sb
->s_flags
|= MS_NODEV
| MS_NOSUID
;
443 sbi
->s_data_blksize
= sb
->s_blocksize
;
444 if (sbi
->s_flags
& SF_OFS
)
445 sbi
->s_data_blksize
-= 24;
447 /* Keep super block in cache */
448 sbi
->s_root_bh
= root_bh
;
449 /* N.B. after this point s_root_bh must be released */
451 tmp_flags
= sb
->s_flags
;
452 if (affs_init_bitmap(sb
, &tmp_flags
))
454 sb
->s_flags
= tmp_flags
;
456 /* set up enough so that it can read an inode */
458 root_inode
= affs_iget(sb
, root_block
);
459 if (IS_ERR(root_inode
)) {
460 ret
= PTR_ERR(root_inode
);
461 goto out_error_noinode
;
464 sb
->s_root
= d_alloc_root(root_inode
);
466 printk(KERN_ERR
"AFFS: Get root inode failed\n");
469 sb
->s_root
->d_op
= &affs_dentry_operations
;
471 pr_debug("AFFS: s_flags=%lX\n",sb
->s_flags
);
475 * Begin the cascaded cleanup ...
481 kfree(sbi
->s_bitmap
);
482 affs_brelse(root_bh
);
483 kfree(sbi
->s_prefix
);
485 sb
->s_fs_info
= NULL
;
490 affs_remount(struct super_block
*sb
, int *flags
, char *data
)
492 struct affs_sb_info
*sbi
= AFFS_SB(sb
);
499 unsigned long mount_flags
;
501 char *new_opts
= kstrdup(data
, GFP_KERNEL
);
503 pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\")\n",*flags
,data
);
505 *flags
|= MS_NODIRATIME
;
507 if (!parse_options(data
, &uid
, &gid
, &mode
, &reserved
, &root_block
,
508 &blocksize
, &sbi
->s_prefix
, sbi
->s_volume
,
513 replace_mount_options(sb
, new_opts
);
515 sbi
->s_flags
= mount_flags
;
520 if ((*flags
& MS_RDONLY
) == (sb
->s_flags
& MS_RDONLY
))
522 if (*flags
& MS_RDONLY
) {
525 affs_write_super(sb
);
526 affs_free_bitmap(sb
);
528 res
= affs_init_bitmap(sb
, flags
);
534 affs_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
536 struct super_block
*sb
= dentry
->d_sb
;
538 u64 id
= huge_encode_dev(sb
->s_bdev
->bd_dev
);
540 pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",AFFS_SB(sb
)->s_partition_size
,
541 AFFS_SB(sb
)->s_reserved
);
543 free
= affs_count_free_blocks(sb
);
544 buf
->f_type
= AFFS_SUPER_MAGIC
;
545 buf
->f_bsize
= sb
->s_blocksize
;
546 buf
->f_blocks
= AFFS_SB(sb
)->s_partition_size
- AFFS_SB(sb
)->s_reserved
;
548 buf
->f_bavail
= free
;
549 buf
->f_fsid
.val
[0] = (u32
)id
;
550 buf
->f_fsid
.val
[1] = (u32
)(id
>> 32);
555 static int affs_get_sb(struct file_system_type
*fs_type
,
556 int flags
, const char *dev_name
, void *data
, struct vfsmount
*mnt
)
558 return get_sb_bdev(fs_type
, flags
, dev_name
, data
, affs_fill_super
,
562 static struct file_system_type affs_fs_type
= {
563 .owner
= THIS_MODULE
,
565 .get_sb
= affs_get_sb
,
566 .kill_sb
= kill_block_super
,
567 .fs_flags
= FS_REQUIRES_DEV
,
570 static int __init
init_affs_fs(void)
572 int err
= init_inodecache();
575 err
= register_filesystem(&affs_fs_type
);
580 destroy_inodecache();
585 static void __exit
exit_affs_fs(void)
587 unregister_filesystem(&affs_fs_type
);
588 destroy_inodecache();
591 MODULE_DESCRIPTION("Amiga filesystem support for Linux");
592 MODULE_LICENSE("GPL");
594 module_init(init_affs_fs
)
595 module_exit(exit_affs_fs
)