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>
19 extern struct timezone sys_tz
;
21 static int affs_statfs(struct super_block
*sb
, struct kstatfs
*buf
);
22 static int affs_remount (struct super_block
*sb
, int *flags
, char *data
);
25 affs_put_super(struct super_block
*sb
)
27 struct affs_sb_info
*sbi
= AFFS_SB(sb
);
28 pr_debug("AFFS: put_super()\n");
30 if (!(sb
->s_flags
& MS_RDONLY
)) {
31 AFFS_ROOT_TAIL(sb
, sbi
->s_root_bh
)->bm_flag
= cpu_to_be32(1);
32 secs_to_datestamp(get_seconds(),
33 &AFFS_ROOT_TAIL(sb
, sbi
->s_root_bh
)->disk_change
);
34 affs_fix_checksum(sb
, sbi
->s_root_bh
);
35 mark_buffer_dirty(sbi
->s_root_bh
);
40 affs_brelse(sbi
->s_root_bh
);
47 affs_write_super(struct super_block
*sb
)
50 struct affs_sb_info
*sbi
= AFFS_SB(sb
);
52 if (!(sb
->s_flags
& MS_RDONLY
)) {
53 // if (sbi->s_bitmap[i].bm_bh) {
54 // if (buffer_dirty(sbi->s_bitmap[i].bm_bh)) {
56 AFFS_ROOT_TAIL(sb
, sbi
->s_root_bh
)->bm_flag
= cpu_to_be32(clean
);
57 secs_to_datestamp(get_seconds(),
58 &AFFS_ROOT_TAIL(sb
, sbi
->s_root_bh
)->disk_change
);
59 affs_fix_checksum(sb
, sbi
->s_root_bh
);
60 mark_buffer_dirty(sbi
->s_root_bh
);
61 sb
->s_dirt
= !clean
; /* redo until bitmap synced */
65 pr_debug("AFFS: write_super() at %lu, clean=%d\n", get_seconds(), clean
);
68 static kmem_cache_t
* affs_inode_cachep
;
70 static struct inode
*affs_alloc_inode(struct super_block
*sb
)
72 struct affs_inode_info
*ei
;
73 ei
= (struct affs_inode_info
*)kmem_cache_alloc(affs_inode_cachep
, SLAB_KERNEL
);
76 ei
->vfs_inode
.i_version
= 1;
77 return &ei
->vfs_inode
;
80 static void affs_destroy_inode(struct inode
*inode
)
82 kmem_cache_free(affs_inode_cachep
, AFFS_I(inode
));
85 static void init_once(void * foo
, kmem_cache_t
* cachep
, unsigned long flags
)
87 struct affs_inode_info
*ei
= (struct affs_inode_info
*) foo
;
89 if ((flags
& (SLAB_CTOR_VERIFY
|SLAB_CTOR_CONSTRUCTOR
)) ==
90 SLAB_CTOR_CONSTRUCTOR
) {
91 init_MUTEX(&ei
->i_link_lock
);
92 init_MUTEX(&ei
->i_ext_lock
);
93 inode_init_once(&ei
->vfs_inode
);
97 static int init_inodecache(void)
99 affs_inode_cachep
= kmem_cache_create("affs_inode_cache",
100 sizeof(struct affs_inode_info
),
101 0, SLAB_RECLAIM_ACCOUNT
,
103 if (affs_inode_cachep
== NULL
)
108 static void destroy_inodecache(void)
110 if (kmem_cache_destroy(affs_inode_cachep
))
111 printk(KERN_INFO
"affs_inode_cache: not all structures were freed\n");
114 static struct super_operations affs_sops
= {
115 .alloc_inode
= affs_alloc_inode
,
116 .destroy_inode
= affs_destroy_inode
,
117 .read_inode
= affs_read_inode
,
118 .write_inode
= affs_write_inode
,
119 .put_inode
= affs_put_inode
,
120 .delete_inode
= affs_delete_inode
,
121 .clear_inode
= affs_clear_inode
,
122 .put_super
= affs_put_super
,
123 .write_super
= affs_write_super
,
124 .statfs
= affs_statfs
,
125 .remount_fs
= affs_remount
,
129 Opt_bs
, Opt_mode
, Opt_mufs
, Opt_prefix
, Opt_protect
,
130 Opt_reserved
, Opt_root
, Opt_setgid
, Opt_setuid
,
131 Opt_verbose
, Opt_volume
, Opt_ignore
, Opt_err
,
134 static match_table_t tokens
= {
136 {Opt_mode
, "mode=%o"},
138 {Opt_prefix
, "prefix=%s"},
139 {Opt_protect
, "protect"},
140 {Opt_reserved
, "reserved=%u"},
141 {Opt_root
, "root=%u"},
142 {Opt_setgid
, "setgid=%u"},
143 {Opt_setuid
, "setuid=%u"},
144 {Opt_verbose
, "verbose"},
145 {Opt_volume
, "volume=%s"},
146 {Opt_ignore
, "grpquota"},
147 {Opt_ignore
, "noquota"},
148 {Opt_ignore
, "quota"},
149 {Opt_ignore
, "usrquota"},
154 parse_options(char *options
, uid_t
*uid
, gid_t
*gid
, int *mode
, int *reserved
, s32
*root
,
155 int *blocksize
, char **prefix
, char *volume
, unsigned long *mount_opts
)
158 substring_t args
[MAX_OPT_ARGS
];
160 /* Fill in defaults */
173 while ((p
= strsep(&options
, ",")) != NULL
) {
174 int token
, n
, option
;
178 token
= match_token(p
, tokens
, args
);
181 if (match_int(&args
[0], &n
))
183 if (n
!= 512 && n
!= 1024 && n
!= 2048
185 printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
191 if (match_octal(&args
[0], &option
))
193 *mode
= option
& 0777;
194 *mount_opts
|= SF_SETMODE
;
197 *mount_opts
|= SF_MUFS
;
200 /* Free any previous prefix */
203 *prefix
= match_strdup(&args
[0]);
206 *mount_opts
|= SF_PREFIX
;
209 *mount_opts
|= SF_IMMUTABLE
;
212 if (match_int(&args
[0], reserved
))
216 if (match_int(&args
[0], root
))
220 if (match_int(&args
[0], &option
))
223 *mount_opts
|= SF_SETGID
;
226 if (match_int(&args
[0], &option
))
229 *mount_opts
|= SF_SETUID
;
232 *mount_opts
|= SF_VERBOSE
;
235 char *vol
= match_strdup(&args
[0]);
236 strlcpy(volume
, vol
, 32);
241 /* Silently ignore the quota options */
244 printk("AFFS: Unrecognized mount option \"%s\" "
245 "or missing value\n", p
);
252 /* This function definitely needs to be split up. Some fine day I'll
253 * hopefully have the guts to do so. Until then: sorry for the mess.
256 static int affs_fill_super(struct super_block
*sb
, void *data
, int silent
)
258 struct affs_sb_info
*sbi
;
259 struct buffer_head
*root_bh
= NULL
;
260 struct buffer_head
*boot_bh
;
261 struct inode
*root_inode
= NULL
;
271 unsigned long mount_flags
;
272 int tmp_flags
; /* fix remount prototype... */
274 pr_debug("AFFS: read_super(%s)\n",data
? (const char *)data
: "no options");
276 sb
->s_magic
= AFFS_SUPER_MAGIC
;
277 sb
->s_op
= &affs_sops
;
278 sb
->s_flags
|= MS_NODIRATIME
;
280 sbi
= kmalloc(sizeof(struct affs_sb_info
), GFP_KERNEL
);
284 memset(sbi
, 0, sizeof(*sbi
));
285 init_MUTEX(&sbi
->s_bmlock
);
287 if (!parse_options(data
,&uid
,&gid
,&i
,&reserved
,&root_block
,
288 &blocksize
,&sbi
->s_prefix
,
289 sbi
->s_volume
, &mount_flags
)) {
290 printk(KERN_ERR
"AFFS: Error parsing options\n");
293 /* N.B. after this point s_prefix must be released */
295 sbi
->s_flags
= mount_flags
;
299 sbi
->s_reserved
= reserved
;
301 /* Get the size of the device in 512-byte blocks.
302 * If we later see that the partition uses bigger
303 * blocks, we will have to change it.
306 size
= sb
->s_bdev
->bd_inode
->i_size
>> 9;
307 pr_debug("AFFS: initial blocksize=%d, #blocks=%d\n", 512, size
);
309 affs_set_blocksize(sb
, PAGE_SIZE
);
310 /* Try to find root block. Its location depends on the block size. */
316 size
= size
/ (blocksize
/ 512);
318 for (blocksize
= i
, key
= 0; blocksize
<= j
; blocksize
<<= 1, size
>>= 1) {
319 sbi
->s_root_block
= root_block
;
321 sbi
->s_root_block
= (reserved
+ size
- 1) / 2;
322 pr_debug("AFFS: setting blocksize to %d\n", blocksize
);
323 affs_set_blocksize(sb
, blocksize
);
324 sbi
->s_partition_size
= size
;
326 /* The root block location that was calculated above is not
327 * correct if the partition size is an odd number of 512-
328 * byte blocks, which will be rounded down to a number of
329 * 1024-byte blocks, and if there were an even number of
330 * reserved blocks. Ideally, all partition checkers should
331 * report the real number of blocks of the real blocksize,
332 * but since this just cannot be done, we have to try to
333 * find the root block anyways. In the above case, it is one
334 * block behind the calculated one. So we check this one, too.
336 for (num_bm
= 0; num_bm
< 2; num_bm
++) {
337 pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, "
338 "size=%d, reserved=%d\n",
340 sbi
->s_root_block
+ num_bm
,
341 blocksize
, size
, reserved
);
342 root_bh
= affs_bread(sb
, sbi
->s_root_block
+ num_bm
);
345 if (!affs_checksum_block(sb
, root_bh
) &&
346 be32_to_cpu(AFFS_ROOT_HEAD(root_bh
)->ptype
) == T_SHORT
&&
347 be32_to_cpu(AFFS_ROOT_TAIL(sb
, root_bh
)->stype
) == ST_ROOT
) {
348 sbi
->s_hashsize
= blocksize
/ 4 - 56;
349 sbi
->s_root_block
+= num_bm
;
353 affs_brelse(root_bh
);
358 printk(KERN_ERR
"AFFS: No valid root block on device %s\n",
362 /* N.B. after this point bh must be released */
364 root_block
= sbi
->s_root_block
;
366 /* Find out which kind of FS we have */
367 boot_bh
= sb_bread(sb
, 0);
369 printk(KERN_ERR
"AFFS: Cannot read boot block\n");
372 chksum
= be32_to_cpu(*(__be32
*)boot_bh
->b_data
);
375 /* Dircache filesystems are compatible with non-dircache ones
376 * when reading. As long as they aren't supported, writing is
379 if ((chksum
== FS_DCFFS
|| chksum
== MUFS_DCFFS
|| chksum
== FS_DCOFS
380 || chksum
== MUFS_DCOFS
) && !(sb
->s_flags
& MS_RDONLY
)) {
381 printk(KERN_NOTICE
"AFFS: Dircache FS - mounting %s read only\n",
383 sb
->s_flags
|= MS_RDONLY
;
389 sbi
->s_flags
|= SF_MUFS
;
393 sbi
->s_flags
|= SF_INTL
;
396 sbi
->s_flags
|= SF_MUFS
;
401 sbi
->s_flags
|= SF_MUFS
;
404 sbi
->s_flags
|= SF_OFS
;
405 sb
->s_flags
|= MS_NOEXEC
;
409 sbi
->s_flags
|= SF_MUFS
;
412 sbi
->s_flags
|= SF_INTL
| SF_OFS
;
413 sb
->s_flags
|= MS_NOEXEC
;
416 printk(KERN_ERR
"AFFS: Unknown filesystem on device %s: %08X\n",
421 if (mount_flags
& SF_VERBOSE
) {
422 chksum
= cpu_to_be32(chksum
);
423 printk(KERN_NOTICE
"AFFS: Mounting volume \"%*s\": Type=%.3s\\%c, Blocksize=%d\n",
424 AFFS_ROOT_TAIL(sb
, root_bh
)->disk_name
[0],
425 AFFS_ROOT_TAIL(sb
, root_bh
)->disk_name
+ 1,
426 (char *)&chksum
,((char *)&chksum
)[3] + '0',blocksize
);
429 sb
->s_flags
|= MS_NODEV
| MS_NOSUID
;
431 sbi
->s_data_blksize
= sb
->s_blocksize
;
432 if (sbi
->s_flags
& SF_OFS
)
433 sbi
->s_data_blksize
-= 24;
435 /* Keep super block in cache */
436 sbi
->s_root_bh
= root_bh
;
437 /* N.B. after this point s_root_bh must be released */
439 tmp_flags
= sb
->s_flags
;
440 if (affs_init_bitmap(sb
, &tmp_flags
))
442 sb
->s_flags
= tmp_flags
;
444 /* set up enough so that it can read an inode */
446 root_inode
= iget(sb
, root_block
);
447 sb
->s_root
= d_alloc_root(root_inode
);
449 printk(KERN_ERR
"AFFS: Get root inode failed\n");
452 sb
->s_root
->d_op
= &affs_dentry_operations
;
454 pr_debug("AFFS: s_flags=%lX\n",sb
->s_flags
);
458 * Begin the cascaded cleanup ...
463 kfree(sbi
->s_bitmap
);
464 affs_brelse(root_bh
);
465 kfree(sbi
->s_prefix
);
467 sb
->s_fs_info
= NULL
;
472 affs_remount(struct super_block
*sb
, int *flags
, char *data
)
474 struct affs_sb_info
*sbi
= AFFS_SB(sb
);
481 unsigned long mount_flags
;
484 pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\")\n",*flags
,data
);
486 *flags
|= MS_NODIRATIME
;
488 if (!parse_options(data
,&uid
,&gid
,&mode
,&reserved
,&root_block
,
489 &blocksize
,&sbi
->s_prefix
,sbi
->s_volume
,&mount_flags
))
491 sbi
->s_flags
= mount_flags
;
496 if ((*flags
& MS_RDONLY
) == (sb
->s_flags
& MS_RDONLY
))
498 if (*flags
& MS_RDONLY
) {
501 affs_write_super(sb
);
502 affs_free_bitmap(sb
);
504 res
= affs_init_bitmap(sb
, flags
);
510 affs_statfs(struct super_block
*sb
, struct kstatfs
*buf
)
514 pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",AFFS_SB(sb
)->s_partition_size
,
515 AFFS_SB(sb
)->s_reserved
);
517 free
= affs_count_free_blocks(sb
);
518 buf
->f_type
= AFFS_SUPER_MAGIC
;
519 buf
->f_bsize
= sb
->s_blocksize
;
520 buf
->f_blocks
= AFFS_SB(sb
)->s_partition_size
- AFFS_SB(sb
)->s_reserved
;
522 buf
->f_bavail
= free
;
526 static struct super_block
*affs_get_sb(struct file_system_type
*fs_type
,
527 int flags
, const char *dev_name
, void *data
)
529 return get_sb_bdev(fs_type
, flags
, dev_name
, data
, affs_fill_super
);
532 static struct file_system_type affs_fs_type
= {
533 .owner
= THIS_MODULE
,
535 .get_sb
= affs_get_sb
,
536 .kill_sb
= kill_block_super
,
537 .fs_flags
= FS_REQUIRES_DEV
,
540 static int __init
init_affs_fs(void)
542 int err
= init_inodecache();
545 err
= register_filesystem(&affs_fs_type
);
550 destroy_inodecache();
555 static void __exit
exit_affs_fs(void)
557 unregister_filesystem(&affs_fs_type
);
558 destroy_inodecache();
561 MODULE_DESCRIPTION("Amiga filesystem support for Linux");
562 MODULE_LICENSE("GPL");
564 module_init(init_affs_fs
)
565 module_exit(exit_affs_fs
)