2 * linux/fs/minix/inode.c
4 * Copyright (C) 1991, 1992 Linus Torvalds
6 * Copyright (C) 1996 Gertjan van Wingerde (gertjan@cs.vu.nl)
9 * Modified for 680x0 by Andreas Schwab
10 * Updated to filesystem version 3 by Daniel Aragones
13 #include <linux/module.h>
15 #include <linux/buffer_head.h>
16 #include <linux/slab.h>
17 #include <linux/init.h>
18 #include <linux/highuid.h>
19 #include <linux/vfs.h>
21 static void minix_read_inode(struct inode
* inode
);
22 static int minix_write_inode(struct inode
* inode
, int wait
);
23 static int minix_statfs(struct dentry
*dentry
, struct kstatfs
*buf
);
24 static int minix_remount (struct super_block
* sb
, int * flags
, char * data
);
26 static void minix_delete_inode(struct inode
*inode
)
28 truncate_inode_pages(&inode
->i_data
, 0);
30 minix_truncate(inode
);
31 minix_free_inode(inode
);
34 static void minix_put_super(struct super_block
*sb
)
37 struct minix_sb_info
*sbi
= minix_sb(sb
);
39 if (!(sb
->s_flags
& MS_RDONLY
)) {
40 if (sbi
->s_version
!= MINIX_V3
) /* s_state is now out from V3 sb */
41 sbi
->s_ms
->s_state
= sbi
->s_mount_state
;
42 mark_buffer_dirty(sbi
->s_sbh
);
44 for (i
= 0; i
< sbi
->s_imap_blocks
; i
++)
45 brelse(sbi
->s_imap
[i
]);
46 for (i
= 0; i
< sbi
->s_zmap_blocks
; i
++)
47 brelse(sbi
->s_zmap
[i
]);
56 static struct kmem_cache
* minix_inode_cachep
;
58 static struct inode
*minix_alloc_inode(struct super_block
*sb
)
60 struct minix_inode_info
*ei
;
61 ei
= (struct minix_inode_info
*)kmem_cache_alloc(minix_inode_cachep
, GFP_KERNEL
);
64 return &ei
->vfs_inode
;
67 static void minix_destroy_inode(struct inode
*inode
)
69 kmem_cache_free(minix_inode_cachep
, minix_i(inode
));
72 static void init_once(void * foo
, struct kmem_cache
* cachep
, unsigned long flags
)
74 struct minix_inode_info
*ei
= (struct minix_inode_info
*) foo
;
76 if (flags
& SLAB_CTOR_CONSTRUCTOR
)
77 inode_init_once(&ei
->vfs_inode
);
80 static int init_inodecache(void)
82 minix_inode_cachep
= kmem_cache_create("minix_inode_cache",
83 sizeof(struct minix_inode_info
),
84 0, (SLAB_RECLAIM_ACCOUNT
|
87 if (minix_inode_cachep
== NULL
)
92 static void destroy_inodecache(void)
94 kmem_cache_destroy(minix_inode_cachep
);
97 static const struct super_operations minix_sops
= {
98 .alloc_inode
= minix_alloc_inode
,
99 .destroy_inode
= minix_destroy_inode
,
100 .read_inode
= minix_read_inode
,
101 .write_inode
= minix_write_inode
,
102 .delete_inode
= minix_delete_inode
,
103 .put_super
= minix_put_super
,
104 .statfs
= minix_statfs
,
105 .remount_fs
= minix_remount
,
108 static int minix_remount (struct super_block
* sb
, int * flags
, char * data
)
110 struct minix_sb_info
* sbi
= minix_sb(sb
);
111 struct minix_super_block
* ms
;
114 if ((*flags
& MS_RDONLY
) == (sb
->s_flags
& MS_RDONLY
))
116 if (*flags
& MS_RDONLY
) {
117 if (ms
->s_state
& MINIX_VALID_FS
||
118 !(sbi
->s_mount_state
& MINIX_VALID_FS
))
120 /* Mounting a rw partition read-only. */
121 if (sbi
->s_version
!= MINIX_V3
)
122 ms
->s_state
= sbi
->s_mount_state
;
123 mark_buffer_dirty(sbi
->s_sbh
);
125 /* Mount a partition which is read-only, read-write. */
126 if (sbi
->s_version
!= MINIX_V3
) {
127 sbi
->s_mount_state
= ms
->s_state
;
128 ms
->s_state
&= ~MINIX_VALID_FS
;
130 sbi
->s_mount_state
= MINIX_VALID_FS
;
132 mark_buffer_dirty(sbi
->s_sbh
);
134 if (!(sbi
->s_mount_state
& MINIX_VALID_FS
))
135 printk("MINIX-fs warning: remounting unchecked fs, "
136 "running fsck is recommended\n");
137 else if ((sbi
->s_mount_state
& MINIX_ERROR_FS
))
138 printk("MINIX-fs warning: remounting fs with errors, "
139 "running fsck is recommended\n");
144 static int minix_fill_super(struct super_block
*s
, void *data
, int silent
)
146 struct buffer_head
*bh
;
147 struct buffer_head
**map
;
148 struct minix_super_block
*ms
;
149 struct minix3_super_block
*m3s
= NULL
;
150 unsigned long i
, block
;
151 struct inode
*root_inode
;
152 struct minix_sb_info
*sbi
;
154 sbi
= kzalloc(sizeof(struct minix_sb_info
), GFP_KERNEL
);
159 BUILD_BUG_ON(32 != sizeof (struct minix_inode
));
160 BUILD_BUG_ON(64 != sizeof(struct minix2_inode
));
162 if (!sb_set_blocksize(s
, BLOCK_SIZE
))
165 if (!(bh
= sb_bread(s
, 1)))
168 ms
= (struct minix_super_block
*) bh
->b_data
;
171 sbi
->s_mount_state
= ms
->s_state
;
172 sbi
->s_ninodes
= ms
->s_ninodes
;
173 sbi
->s_nzones
= ms
->s_nzones
;
174 sbi
->s_imap_blocks
= ms
->s_imap_blocks
;
175 sbi
->s_zmap_blocks
= ms
->s_zmap_blocks
;
176 sbi
->s_firstdatazone
= ms
->s_firstdatazone
;
177 sbi
->s_log_zone_size
= ms
->s_log_zone_size
;
178 sbi
->s_max_size
= ms
->s_max_size
;
179 s
->s_magic
= ms
->s_magic
;
180 if (s
->s_magic
== MINIX_SUPER_MAGIC
) {
181 sbi
->s_version
= MINIX_V1
;
184 sbi
->s_link_max
= MINIX_LINK_MAX
;
185 } else if (s
->s_magic
== MINIX_SUPER_MAGIC2
) {
186 sbi
->s_version
= MINIX_V1
;
189 sbi
->s_link_max
= MINIX_LINK_MAX
;
190 } else if (s
->s_magic
== MINIX2_SUPER_MAGIC
) {
191 sbi
->s_version
= MINIX_V2
;
192 sbi
->s_nzones
= ms
->s_zones
;
195 sbi
->s_link_max
= MINIX2_LINK_MAX
;
196 } else if (s
->s_magic
== MINIX2_SUPER_MAGIC2
) {
197 sbi
->s_version
= MINIX_V2
;
198 sbi
->s_nzones
= ms
->s_zones
;
201 sbi
->s_link_max
= MINIX2_LINK_MAX
;
202 } else if ( *(__u16
*)(bh
->b_data
+ 24) == MINIX3_SUPER_MAGIC
) {
203 m3s
= (struct minix3_super_block
*) bh
->b_data
;
204 s
->s_magic
= m3s
->s_magic
;
205 sbi
->s_imap_blocks
= m3s
->s_imap_blocks
;
206 sbi
->s_zmap_blocks
= m3s
->s_zmap_blocks
;
207 sbi
->s_firstdatazone
= m3s
->s_firstdatazone
;
208 sbi
->s_log_zone_size
= m3s
->s_log_zone_size
;
209 sbi
->s_max_size
= m3s
->s_max_size
;
210 sbi
->s_ninodes
= m3s
->s_ninodes
;
211 sbi
->s_nzones
= m3s
->s_zones
;
214 sbi
->s_version
= MINIX_V3
;
215 sbi
->s_link_max
= MINIX2_LINK_MAX
;
216 sbi
->s_mount_state
= MINIX_VALID_FS
;
217 sb_set_blocksize(s
, m3s
->s_blocksize
);
222 * Allocate the buffer map to keep the superblock small.
224 if (sbi
->s_imap_blocks
== 0 || sbi
->s_zmap_blocks
== 0)
226 i
= (sbi
->s_imap_blocks
+ sbi
->s_zmap_blocks
) * sizeof(bh
);
227 map
= kzalloc(i
, GFP_KERNEL
);
230 sbi
->s_imap
= &map
[0];
231 sbi
->s_zmap
= &map
[sbi
->s_imap_blocks
];
234 for (i
=0 ; i
< sbi
->s_imap_blocks
; i
++) {
235 if (!(sbi
->s_imap
[i
]=sb_bread(s
, block
)))
239 for (i
=0 ; i
< sbi
->s_zmap_blocks
; i
++) {
240 if (!(sbi
->s_zmap
[i
]=sb_bread(s
, block
)))
245 minix_set_bit(0,sbi
->s_imap
[0]->b_data
);
246 minix_set_bit(0,sbi
->s_zmap
[0]->b_data
);
248 /* set up enough so that it can read an inode */
249 s
->s_op
= &minix_sops
;
250 root_inode
= iget(s
, MINIX_ROOT_INO
);
251 if (!root_inode
|| is_bad_inode(root_inode
))
254 s
->s_root
= d_alloc_root(root_inode
);
259 s
->s_root
->d_op
= &minix_dentry_operations
;
261 if (!(s
->s_flags
& MS_RDONLY
)) {
262 if (sbi
->s_version
!= MINIX_V3
) /* s_state is now out from V3 sb */
263 ms
->s_state
&= ~MINIX_VALID_FS
;
264 mark_buffer_dirty(bh
);
266 if (!(sbi
->s_mount_state
& MINIX_VALID_FS
))
267 printk("MINIX-fs: mounting unchecked file system, "
268 "running fsck is recommended\n");
269 else if (sbi
->s_mount_state
& MINIX_ERROR_FS
)
270 printk("MINIX-fs: mounting file system with errors, "
271 "running fsck is recommended\n");
280 printk("MINIX-fs: get root inode failed\n");
284 printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
286 for (i
= 0; i
< sbi
->s_imap_blocks
; i
++)
287 brelse(sbi
->s_imap
[i
]);
288 for (i
= 0; i
< sbi
->s_zmap_blocks
; i
++)
289 brelse(sbi
->s_zmap
[i
]);
295 printk("MINIX-fs: can't allocate map\n");
300 printk("MINIX-fs: bad superblock\n");
305 printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 "
306 "on device %s.\n", s
->s_id
);
312 printk("MINIX-fs: blocksize too small for device\n");
316 printk("MINIX-fs: unable to read superblock\n");
323 static int minix_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
325 struct minix_sb_info
*sbi
= minix_sb(dentry
->d_sb
);
326 buf
->f_type
= dentry
->d_sb
->s_magic
;
327 buf
->f_bsize
= dentry
->d_sb
->s_blocksize
;
328 buf
->f_blocks
= (sbi
->s_nzones
- sbi
->s_firstdatazone
) << sbi
->s_log_zone_size
;
329 buf
->f_bfree
= minix_count_free_blocks(sbi
);
330 buf
->f_bavail
= buf
->f_bfree
;
331 buf
->f_files
= sbi
->s_ninodes
;
332 buf
->f_ffree
= minix_count_free_inodes(sbi
);
333 buf
->f_namelen
= sbi
->s_namelen
;
337 static int minix_get_block(struct inode
*inode
, sector_t block
,
338 struct buffer_head
*bh_result
, int create
)
340 if (INODE_VERSION(inode
) == MINIX_V1
)
341 return V1_minix_get_block(inode
, block
, bh_result
, create
);
343 return V2_minix_get_block(inode
, block
, bh_result
, create
);
346 static int minix_writepage(struct page
*page
, struct writeback_control
*wbc
)
348 return block_write_full_page(page
, minix_get_block
, wbc
);
350 static int minix_readpage(struct file
*file
, struct page
*page
)
352 return block_read_full_page(page
,minix_get_block
);
354 static int minix_prepare_write(struct file
*file
, struct page
*page
, unsigned from
, unsigned to
)
356 return block_prepare_write(page
,from
,to
,minix_get_block
);
358 static sector_t
minix_bmap(struct address_space
*mapping
, sector_t block
)
360 return generic_block_bmap(mapping
,block
,minix_get_block
);
362 static const struct address_space_operations minix_aops
= {
363 .readpage
= minix_readpage
,
364 .writepage
= minix_writepage
,
365 .sync_page
= block_sync_page
,
366 .prepare_write
= minix_prepare_write
,
367 .commit_write
= generic_commit_write
,
371 static const struct inode_operations minix_symlink_inode_operations
= {
372 .readlink
= generic_readlink
,
373 .follow_link
= page_follow_link_light
,
374 .put_link
= page_put_link
,
375 .getattr
= minix_getattr
,
378 void minix_set_inode(struct inode
*inode
, dev_t rdev
)
380 if (S_ISREG(inode
->i_mode
)) {
381 inode
->i_op
= &minix_file_inode_operations
;
382 inode
->i_fop
= &minix_file_operations
;
383 inode
->i_mapping
->a_ops
= &minix_aops
;
384 } else if (S_ISDIR(inode
->i_mode
)) {
385 inode
->i_op
= &minix_dir_inode_operations
;
386 inode
->i_fop
= &minix_dir_operations
;
387 inode
->i_mapping
->a_ops
= &minix_aops
;
388 } else if (S_ISLNK(inode
->i_mode
)) {
389 inode
->i_op
= &minix_symlink_inode_operations
;
390 inode
->i_mapping
->a_ops
= &minix_aops
;
392 init_special_inode(inode
, inode
->i_mode
, rdev
);
396 * The minix V1 function to read an inode.
398 static void V1_minix_read_inode(struct inode
* inode
)
400 struct buffer_head
* bh
;
401 struct minix_inode
* raw_inode
;
402 struct minix_inode_info
*minix_inode
= minix_i(inode
);
405 raw_inode
= minix_V1_raw_inode(inode
->i_sb
, inode
->i_ino
, &bh
);
407 make_bad_inode(inode
);
410 inode
->i_mode
= raw_inode
->i_mode
;
411 inode
->i_uid
= (uid_t
)raw_inode
->i_uid
;
412 inode
->i_gid
= (gid_t
)raw_inode
->i_gid
;
413 inode
->i_nlink
= raw_inode
->i_nlinks
;
414 inode
->i_size
= raw_inode
->i_size
;
415 inode
->i_mtime
.tv_sec
= inode
->i_atime
.tv_sec
= inode
->i_ctime
.tv_sec
= raw_inode
->i_time
;
416 inode
->i_mtime
.tv_nsec
= 0;
417 inode
->i_atime
.tv_nsec
= 0;
418 inode
->i_ctime
.tv_nsec
= 0;
420 for (i
= 0; i
< 9; i
++)
421 minix_inode
->u
.i1_data
[i
] = raw_inode
->i_zone
[i
];
422 minix_set_inode(inode
, old_decode_dev(raw_inode
->i_zone
[0]));
427 * The minix V2 function to read an inode.
429 static void V2_minix_read_inode(struct inode
* inode
)
431 struct buffer_head
* bh
;
432 struct minix2_inode
* raw_inode
;
433 struct minix_inode_info
*minix_inode
= minix_i(inode
);
436 raw_inode
= minix_V2_raw_inode(inode
->i_sb
, inode
->i_ino
, &bh
);
438 make_bad_inode(inode
);
441 inode
->i_mode
= raw_inode
->i_mode
;
442 inode
->i_uid
= (uid_t
)raw_inode
->i_uid
;
443 inode
->i_gid
= (gid_t
)raw_inode
->i_gid
;
444 inode
->i_nlink
= raw_inode
->i_nlinks
;
445 inode
->i_size
= raw_inode
->i_size
;
446 inode
->i_mtime
.tv_sec
= raw_inode
->i_mtime
;
447 inode
->i_atime
.tv_sec
= raw_inode
->i_atime
;
448 inode
->i_ctime
.tv_sec
= raw_inode
->i_ctime
;
449 inode
->i_mtime
.tv_nsec
= 0;
450 inode
->i_atime
.tv_nsec
= 0;
451 inode
->i_ctime
.tv_nsec
= 0;
453 for (i
= 0; i
< 10; i
++)
454 minix_inode
->u
.i2_data
[i
] = raw_inode
->i_zone
[i
];
455 minix_set_inode(inode
, old_decode_dev(raw_inode
->i_zone
[0]));
460 * The global function to read an inode.
462 static void minix_read_inode(struct inode
* inode
)
464 if (INODE_VERSION(inode
) == MINIX_V1
)
465 V1_minix_read_inode(inode
);
467 V2_minix_read_inode(inode
);
471 * The minix V1 function to synchronize an inode.
473 static struct buffer_head
* V1_minix_update_inode(struct inode
* inode
)
475 struct buffer_head
* bh
;
476 struct minix_inode
* raw_inode
;
477 struct minix_inode_info
*minix_inode
= minix_i(inode
);
480 raw_inode
= minix_V1_raw_inode(inode
->i_sb
, inode
->i_ino
, &bh
);
483 raw_inode
->i_mode
= inode
->i_mode
;
484 raw_inode
->i_uid
= fs_high2lowuid(inode
->i_uid
);
485 raw_inode
->i_gid
= fs_high2lowgid(inode
->i_gid
);
486 raw_inode
->i_nlinks
= inode
->i_nlink
;
487 raw_inode
->i_size
= inode
->i_size
;
488 raw_inode
->i_time
= inode
->i_mtime
.tv_sec
;
489 if (S_ISCHR(inode
->i_mode
) || S_ISBLK(inode
->i_mode
))
490 raw_inode
->i_zone
[0] = old_encode_dev(inode
->i_rdev
);
491 else for (i
= 0; i
< 9; i
++)
492 raw_inode
->i_zone
[i
] = minix_inode
->u
.i1_data
[i
];
493 mark_buffer_dirty(bh
);
498 * The minix V2 function to synchronize an inode.
500 static struct buffer_head
* V2_minix_update_inode(struct inode
* inode
)
502 struct buffer_head
* bh
;
503 struct minix2_inode
* raw_inode
;
504 struct minix_inode_info
*minix_inode
= minix_i(inode
);
507 raw_inode
= minix_V2_raw_inode(inode
->i_sb
, inode
->i_ino
, &bh
);
510 raw_inode
->i_mode
= inode
->i_mode
;
511 raw_inode
->i_uid
= fs_high2lowuid(inode
->i_uid
);
512 raw_inode
->i_gid
= fs_high2lowgid(inode
->i_gid
);
513 raw_inode
->i_nlinks
= inode
->i_nlink
;
514 raw_inode
->i_size
= inode
->i_size
;
515 raw_inode
->i_mtime
= inode
->i_mtime
.tv_sec
;
516 raw_inode
->i_atime
= inode
->i_atime
.tv_sec
;
517 raw_inode
->i_ctime
= inode
->i_ctime
.tv_sec
;
518 if (S_ISCHR(inode
->i_mode
) || S_ISBLK(inode
->i_mode
))
519 raw_inode
->i_zone
[0] = old_encode_dev(inode
->i_rdev
);
520 else for (i
= 0; i
< 10; i
++)
521 raw_inode
->i_zone
[i
] = minix_inode
->u
.i2_data
[i
];
522 mark_buffer_dirty(bh
);
526 static struct buffer_head
*minix_update_inode(struct inode
*inode
)
528 if (INODE_VERSION(inode
) == MINIX_V1
)
529 return V1_minix_update_inode(inode
);
531 return V2_minix_update_inode(inode
);
534 static int minix_write_inode(struct inode
* inode
, int wait
)
536 brelse(minix_update_inode(inode
));
540 int minix_sync_inode(struct inode
* inode
)
543 struct buffer_head
*bh
;
545 bh
= minix_update_inode(inode
);
546 if (bh
&& buffer_dirty(bh
))
548 sync_dirty_buffer(bh
);
549 if (buffer_req(bh
) && !buffer_uptodate(bh
))
551 printk("IO error syncing minix inode [%s:%08lx]\n",
552 inode
->i_sb
->s_id
, inode
->i_ino
);
562 int minix_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
564 struct inode
*dir
= dentry
->d_parent
->d_inode
;
565 struct super_block
*sb
= dir
->i_sb
;
566 generic_fillattr(dentry
->d_inode
, stat
);
567 if (INODE_VERSION(dentry
->d_inode
) == MINIX_V1
)
568 stat
->blocks
= (BLOCK_SIZE
/ 512) * V1_minix_blocks(stat
->size
, sb
);
570 stat
->blocks
= (sb
->s_blocksize
/ 512) * V2_minix_blocks(stat
->size
, sb
);
571 stat
->blksize
= sb
->s_blocksize
;
576 * The function that is called for file truncation.
578 void minix_truncate(struct inode
* inode
)
580 if (!(S_ISREG(inode
->i_mode
) || S_ISDIR(inode
->i_mode
) || S_ISLNK(inode
->i_mode
)))
582 if (INODE_VERSION(inode
) == MINIX_V1
)
583 V1_minix_truncate(inode
);
585 V2_minix_truncate(inode
);
588 static int minix_get_sb(struct file_system_type
*fs_type
,
589 int flags
, const char *dev_name
, void *data
, struct vfsmount
*mnt
)
591 return get_sb_bdev(fs_type
, flags
, dev_name
, data
, minix_fill_super
,
595 static struct file_system_type minix_fs_type
= {
596 .owner
= THIS_MODULE
,
598 .get_sb
= minix_get_sb
,
599 .kill_sb
= kill_block_super
,
600 .fs_flags
= FS_REQUIRES_DEV
,
603 static int __init
init_minix_fs(void)
605 int err
= init_inodecache();
608 err
= register_filesystem(&minix_fs_type
);
613 destroy_inodecache();
618 static void __exit
exit_minix_fs(void)
620 unregister_filesystem(&minix_fs_type
);
621 destroy_inodecache();
624 module_init(init_minix_fs
)
625 module_exit(exit_minix_fs
)
626 MODULE_LICENSE("GPL");