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_VERIFY
|SLAB_CTOR_CONSTRUCTOR
)) ==
77 SLAB_CTOR_CONSTRUCTOR
)
78 inode_init_once(&ei
->vfs_inode
);
81 static int init_inodecache(void)
83 minix_inode_cachep
= kmem_cache_create("minix_inode_cache",
84 sizeof(struct minix_inode_info
),
85 0, (SLAB_RECLAIM_ACCOUNT
|
88 if (minix_inode_cachep
== NULL
)
93 static void destroy_inodecache(void)
95 kmem_cache_destroy(minix_inode_cachep
);
98 static const struct super_operations minix_sops
= {
99 .alloc_inode
= minix_alloc_inode
,
100 .destroy_inode
= minix_destroy_inode
,
101 .read_inode
= minix_read_inode
,
102 .write_inode
= minix_write_inode
,
103 .delete_inode
= minix_delete_inode
,
104 .put_super
= minix_put_super
,
105 .statfs
= minix_statfs
,
106 .remount_fs
= minix_remount
,
109 static int minix_remount (struct super_block
* sb
, int * flags
, char * data
)
111 struct minix_sb_info
* sbi
= minix_sb(sb
);
112 struct minix_super_block
* ms
;
115 if ((*flags
& MS_RDONLY
) == (sb
->s_flags
& MS_RDONLY
))
117 if (*flags
& MS_RDONLY
) {
118 if (ms
->s_state
& MINIX_VALID_FS
||
119 !(sbi
->s_mount_state
& MINIX_VALID_FS
))
121 /* Mounting a rw partition read-only. */
122 if (sbi
->s_version
!= MINIX_V3
)
123 ms
->s_state
= sbi
->s_mount_state
;
124 mark_buffer_dirty(sbi
->s_sbh
);
126 /* Mount a partition which is read-only, read-write. */
127 if (sbi
->s_version
!= MINIX_V3
) {
128 sbi
->s_mount_state
= ms
->s_state
;
129 ms
->s_state
&= ~MINIX_VALID_FS
;
131 sbi
->s_mount_state
= MINIX_VALID_FS
;
133 mark_buffer_dirty(sbi
->s_sbh
);
135 if (!(sbi
->s_mount_state
& MINIX_VALID_FS
))
136 printk("MINIX-fs warning: remounting unchecked fs, "
137 "running fsck is recommended\n");
138 else if ((sbi
->s_mount_state
& MINIX_ERROR_FS
))
139 printk("MINIX-fs warning: remounting fs with errors, "
140 "running fsck is recommended\n");
145 static int minix_fill_super(struct super_block
*s
, void *data
, int silent
)
147 struct buffer_head
*bh
;
148 struct buffer_head
**map
;
149 struct minix_super_block
*ms
;
150 struct minix3_super_block
*m3s
= NULL
;
151 unsigned long i
, block
;
152 struct inode
*root_inode
;
153 struct minix_sb_info
*sbi
;
155 sbi
= kzalloc(sizeof(struct minix_sb_info
), GFP_KERNEL
);
160 BUILD_BUG_ON(32 != sizeof (struct minix_inode
));
161 BUILD_BUG_ON(64 != sizeof(struct minix2_inode
));
163 if (!sb_set_blocksize(s
, BLOCK_SIZE
))
166 if (!(bh
= sb_bread(s
, 1)))
169 ms
= (struct minix_super_block
*) bh
->b_data
;
172 sbi
->s_mount_state
= ms
->s_state
;
173 sbi
->s_ninodes
= ms
->s_ninodes
;
174 sbi
->s_nzones
= ms
->s_nzones
;
175 sbi
->s_imap_blocks
= ms
->s_imap_blocks
;
176 sbi
->s_zmap_blocks
= ms
->s_zmap_blocks
;
177 sbi
->s_firstdatazone
= ms
->s_firstdatazone
;
178 sbi
->s_log_zone_size
= ms
->s_log_zone_size
;
179 sbi
->s_max_size
= ms
->s_max_size
;
180 s
->s_magic
= ms
->s_magic
;
181 if (s
->s_magic
== MINIX_SUPER_MAGIC
) {
182 sbi
->s_version
= MINIX_V1
;
185 sbi
->s_link_max
= MINIX_LINK_MAX
;
186 } else if (s
->s_magic
== MINIX_SUPER_MAGIC2
) {
187 sbi
->s_version
= MINIX_V1
;
190 sbi
->s_link_max
= MINIX_LINK_MAX
;
191 } else if (s
->s_magic
== MINIX2_SUPER_MAGIC
) {
192 sbi
->s_version
= MINIX_V2
;
193 sbi
->s_nzones
= ms
->s_zones
;
196 sbi
->s_link_max
= MINIX2_LINK_MAX
;
197 } else if (s
->s_magic
== MINIX2_SUPER_MAGIC2
) {
198 sbi
->s_version
= MINIX_V2
;
199 sbi
->s_nzones
= ms
->s_zones
;
202 sbi
->s_link_max
= MINIX2_LINK_MAX
;
203 } else if ( *(__u16
*)(bh
->b_data
+ 24) == MINIX3_SUPER_MAGIC
) {
204 m3s
= (struct minix3_super_block
*) bh
->b_data
;
205 s
->s_magic
= m3s
->s_magic
;
206 sbi
->s_imap_blocks
= m3s
->s_imap_blocks
;
207 sbi
->s_zmap_blocks
= m3s
->s_zmap_blocks
;
208 sbi
->s_firstdatazone
= m3s
->s_firstdatazone
;
209 sbi
->s_log_zone_size
= m3s
->s_log_zone_size
;
210 sbi
->s_max_size
= m3s
->s_max_size
;
211 sbi
->s_ninodes
= m3s
->s_ninodes
;
212 sbi
->s_nzones
= m3s
->s_zones
;
215 sbi
->s_version
= MINIX_V3
;
216 sbi
->s_link_max
= MINIX2_LINK_MAX
;
217 sbi
->s_mount_state
= MINIX_VALID_FS
;
218 sb_set_blocksize(s
, m3s
->s_blocksize
);
223 * Allocate the buffer map to keep the superblock small.
225 if (sbi
->s_imap_blocks
== 0 || sbi
->s_zmap_blocks
== 0)
227 i
= (sbi
->s_imap_blocks
+ sbi
->s_zmap_blocks
) * sizeof(bh
);
228 map
= kzalloc(i
, GFP_KERNEL
);
231 sbi
->s_imap
= &map
[0];
232 sbi
->s_zmap
= &map
[sbi
->s_imap_blocks
];
235 for (i
=0 ; i
< sbi
->s_imap_blocks
; i
++) {
236 if (!(sbi
->s_imap
[i
]=sb_bread(s
, block
)))
240 for (i
=0 ; i
< sbi
->s_zmap_blocks
; i
++) {
241 if (!(sbi
->s_zmap
[i
]=sb_bread(s
, block
)))
246 minix_set_bit(0,sbi
->s_imap
[0]->b_data
);
247 minix_set_bit(0,sbi
->s_zmap
[0]->b_data
);
249 /* set up enough so that it can read an inode */
250 s
->s_op
= &minix_sops
;
251 root_inode
= iget(s
, MINIX_ROOT_INO
);
252 if (!root_inode
|| is_bad_inode(root_inode
))
255 s
->s_root
= d_alloc_root(root_inode
);
260 s
->s_root
->d_op
= &minix_dentry_operations
;
262 if (!(s
->s_flags
& MS_RDONLY
)) {
263 if (sbi
->s_version
!= MINIX_V3
) /* s_state is now out from V3 sb */
264 ms
->s_state
&= ~MINIX_VALID_FS
;
265 mark_buffer_dirty(bh
);
267 if (!(sbi
->s_mount_state
& MINIX_VALID_FS
))
268 printk("MINIX-fs: mounting unchecked file system, "
269 "running fsck is recommended\n");
270 else if (sbi
->s_mount_state
& MINIX_ERROR_FS
)
271 printk("MINIX-fs: mounting file system with errors, "
272 "running fsck is recommended\n");
281 printk("MINIX-fs: get root inode failed\n");
285 printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
287 for (i
= 0; i
< sbi
->s_imap_blocks
; i
++)
288 brelse(sbi
->s_imap
[i
]);
289 for (i
= 0; i
< sbi
->s_zmap_blocks
; i
++)
290 brelse(sbi
->s_zmap
[i
]);
296 printk("MINIX-fs: can't allocate map\n");
301 printk("MINIX-fs: bad superblock\n");
306 printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 "
307 "on device %s.\n", s
->s_id
);
313 printk("MINIX-fs: blocksize too small for device\n");
317 printk("MINIX-fs: unable to read superblock\n");
324 static int minix_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
326 struct minix_sb_info
*sbi
= minix_sb(dentry
->d_sb
);
327 buf
->f_type
= dentry
->d_sb
->s_magic
;
328 buf
->f_bsize
= dentry
->d_sb
->s_blocksize
;
329 buf
->f_blocks
= (sbi
->s_nzones
- sbi
->s_firstdatazone
) << sbi
->s_log_zone_size
;
330 buf
->f_bfree
= minix_count_free_blocks(sbi
);
331 buf
->f_bavail
= buf
->f_bfree
;
332 buf
->f_files
= sbi
->s_ninodes
;
333 buf
->f_ffree
= minix_count_free_inodes(sbi
);
334 buf
->f_namelen
= sbi
->s_namelen
;
338 static int minix_get_block(struct inode
*inode
, sector_t block
,
339 struct buffer_head
*bh_result
, int create
)
341 if (INODE_VERSION(inode
) == MINIX_V1
)
342 return V1_minix_get_block(inode
, block
, bh_result
, create
);
344 return V2_minix_get_block(inode
, block
, bh_result
, create
);
347 static int minix_writepage(struct page
*page
, struct writeback_control
*wbc
)
349 return block_write_full_page(page
, minix_get_block
, wbc
);
351 static int minix_readpage(struct file
*file
, struct page
*page
)
353 return block_read_full_page(page
,minix_get_block
);
355 static int minix_prepare_write(struct file
*file
, struct page
*page
, unsigned from
, unsigned to
)
357 return block_prepare_write(page
,from
,to
,minix_get_block
);
359 static sector_t
minix_bmap(struct address_space
*mapping
, sector_t block
)
361 return generic_block_bmap(mapping
,block
,minix_get_block
);
363 static const struct address_space_operations minix_aops
= {
364 .readpage
= minix_readpage
,
365 .writepage
= minix_writepage
,
366 .sync_page
= block_sync_page
,
367 .prepare_write
= minix_prepare_write
,
368 .commit_write
= generic_commit_write
,
372 static const struct inode_operations minix_symlink_inode_operations
= {
373 .readlink
= generic_readlink
,
374 .follow_link
= page_follow_link_light
,
375 .put_link
= page_put_link
,
376 .getattr
= minix_getattr
,
379 void minix_set_inode(struct inode
*inode
, dev_t rdev
)
381 if (S_ISREG(inode
->i_mode
)) {
382 inode
->i_op
= &minix_file_inode_operations
;
383 inode
->i_fop
= &minix_file_operations
;
384 inode
->i_mapping
->a_ops
= &minix_aops
;
385 } else if (S_ISDIR(inode
->i_mode
)) {
386 inode
->i_op
= &minix_dir_inode_operations
;
387 inode
->i_fop
= &minix_dir_operations
;
388 inode
->i_mapping
->a_ops
= &minix_aops
;
389 } else if (S_ISLNK(inode
->i_mode
)) {
390 inode
->i_op
= &minix_symlink_inode_operations
;
391 inode
->i_mapping
->a_ops
= &minix_aops
;
393 init_special_inode(inode
, inode
->i_mode
, rdev
);
397 * The minix V1 function to read an inode.
399 static void V1_minix_read_inode(struct inode
* inode
)
401 struct buffer_head
* bh
;
402 struct minix_inode
* raw_inode
;
403 struct minix_inode_info
*minix_inode
= minix_i(inode
);
406 raw_inode
= minix_V1_raw_inode(inode
->i_sb
, inode
->i_ino
, &bh
);
408 make_bad_inode(inode
);
411 inode
->i_mode
= raw_inode
->i_mode
;
412 inode
->i_uid
= (uid_t
)raw_inode
->i_uid
;
413 inode
->i_gid
= (gid_t
)raw_inode
->i_gid
;
414 inode
->i_nlink
= raw_inode
->i_nlinks
;
415 inode
->i_size
= raw_inode
->i_size
;
416 inode
->i_mtime
.tv_sec
= inode
->i_atime
.tv_sec
= inode
->i_ctime
.tv_sec
= raw_inode
->i_time
;
417 inode
->i_mtime
.tv_nsec
= 0;
418 inode
->i_atime
.tv_nsec
= 0;
419 inode
->i_ctime
.tv_nsec
= 0;
421 for (i
= 0; i
< 9; i
++)
422 minix_inode
->u
.i1_data
[i
] = raw_inode
->i_zone
[i
];
423 minix_set_inode(inode
, old_decode_dev(raw_inode
->i_zone
[0]));
428 * The minix V2 function to read an inode.
430 static void V2_minix_read_inode(struct inode
* inode
)
432 struct buffer_head
* bh
;
433 struct minix2_inode
* raw_inode
;
434 struct minix_inode_info
*minix_inode
= minix_i(inode
);
437 raw_inode
= minix_V2_raw_inode(inode
->i_sb
, inode
->i_ino
, &bh
);
439 make_bad_inode(inode
);
442 inode
->i_mode
= raw_inode
->i_mode
;
443 inode
->i_uid
= (uid_t
)raw_inode
->i_uid
;
444 inode
->i_gid
= (gid_t
)raw_inode
->i_gid
;
445 inode
->i_nlink
= raw_inode
->i_nlinks
;
446 inode
->i_size
= raw_inode
->i_size
;
447 inode
->i_mtime
.tv_sec
= raw_inode
->i_mtime
;
448 inode
->i_atime
.tv_sec
= raw_inode
->i_atime
;
449 inode
->i_ctime
.tv_sec
= raw_inode
->i_ctime
;
450 inode
->i_mtime
.tv_nsec
= 0;
451 inode
->i_atime
.tv_nsec
= 0;
452 inode
->i_ctime
.tv_nsec
= 0;
454 for (i
= 0; i
< 10; i
++)
455 minix_inode
->u
.i2_data
[i
] = raw_inode
->i_zone
[i
];
456 minix_set_inode(inode
, old_decode_dev(raw_inode
->i_zone
[0]));
461 * The global function to read an inode.
463 static void minix_read_inode(struct inode
* inode
)
465 if (INODE_VERSION(inode
) == MINIX_V1
)
466 V1_minix_read_inode(inode
);
468 V2_minix_read_inode(inode
);
472 * The minix V1 function to synchronize an inode.
474 static struct buffer_head
* V1_minix_update_inode(struct inode
* inode
)
476 struct buffer_head
* bh
;
477 struct minix_inode
* raw_inode
;
478 struct minix_inode_info
*minix_inode
= minix_i(inode
);
481 raw_inode
= minix_V1_raw_inode(inode
->i_sb
, inode
->i_ino
, &bh
);
484 raw_inode
->i_mode
= inode
->i_mode
;
485 raw_inode
->i_uid
= fs_high2lowuid(inode
->i_uid
);
486 raw_inode
->i_gid
= fs_high2lowgid(inode
->i_gid
);
487 raw_inode
->i_nlinks
= inode
->i_nlink
;
488 raw_inode
->i_size
= inode
->i_size
;
489 raw_inode
->i_time
= inode
->i_mtime
.tv_sec
;
490 if (S_ISCHR(inode
->i_mode
) || S_ISBLK(inode
->i_mode
))
491 raw_inode
->i_zone
[0] = old_encode_dev(inode
->i_rdev
);
492 else for (i
= 0; i
< 9; i
++)
493 raw_inode
->i_zone
[i
] = minix_inode
->u
.i1_data
[i
];
494 mark_buffer_dirty(bh
);
499 * The minix V2 function to synchronize an inode.
501 static struct buffer_head
* V2_minix_update_inode(struct inode
* inode
)
503 struct buffer_head
* bh
;
504 struct minix2_inode
* raw_inode
;
505 struct minix_inode_info
*minix_inode
= minix_i(inode
);
508 raw_inode
= minix_V2_raw_inode(inode
->i_sb
, inode
->i_ino
, &bh
);
511 raw_inode
->i_mode
= inode
->i_mode
;
512 raw_inode
->i_uid
= fs_high2lowuid(inode
->i_uid
);
513 raw_inode
->i_gid
= fs_high2lowgid(inode
->i_gid
);
514 raw_inode
->i_nlinks
= inode
->i_nlink
;
515 raw_inode
->i_size
= inode
->i_size
;
516 raw_inode
->i_mtime
= inode
->i_mtime
.tv_sec
;
517 raw_inode
->i_atime
= inode
->i_atime
.tv_sec
;
518 raw_inode
->i_ctime
= inode
->i_ctime
.tv_sec
;
519 if (S_ISCHR(inode
->i_mode
) || S_ISBLK(inode
->i_mode
))
520 raw_inode
->i_zone
[0] = old_encode_dev(inode
->i_rdev
);
521 else for (i
= 0; i
< 10; i
++)
522 raw_inode
->i_zone
[i
] = minix_inode
->u
.i2_data
[i
];
523 mark_buffer_dirty(bh
);
527 static struct buffer_head
*minix_update_inode(struct inode
*inode
)
529 if (INODE_VERSION(inode
) == MINIX_V1
)
530 return V1_minix_update_inode(inode
);
532 return V2_minix_update_inode(inode
);
535 static int minix_write_inode(struct inode
* inode
, int wait
)
537 brelse(minix_update_inode(inode
));
541 int minix_sync_inode(struct inode
* inode
)
544 struct buffer_head
*bh
;
546 bh
= minix_update_inode(inode
);
547 if (bh
&& buffer_dirty(bh
))
549 sync_dirty_buffer(bh
);
550 if (buffer_req(bh
) && !buffer_uptodate(bh
))
552 printk("IO error syncing minix inode [%s:%08lx]\n",
553 inode
->i_sb
->s_id
, inode
->i_ino
);
563 int minix_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
565 struct inode
*dir
= dentry
->d_parent
->d_inode
;
566 struct super_block
*sb
= dir
->i_sb
;
567 generic_fillattr(dentry
->d_inode
, stat
);
568 if (INODE_VERSION(dentry
->d_inode
) == MINIX_V1
)
569 stat
->blocks
= (BLOCK_SIZE
/ 512) * V1_minix_blocks(stat
->size
, sb
);
571 stat
->blocks
= (sb
->s_blocksize
/ 512) * V2_minix_blocks(stat
->size
, sb
);
572 stat
->blksize
= sb
->s_blocksize
;
577 * The function that is called for file truncation.
579 void minix_truncate(struct inode
* inode
)
581 if (!(S_ISREG(inode
->i_mode
) || S_ISDIR(inode
->i_mode
) || S_ISLNK(inode
->i_mode
)))
583 if (INODE_VERSION(inode
) == MINIX_V1
)
584 V1_minix_truncate(inode
);
586 V2_minix_truncate(inode
);
589 static int minix_get_sb(struct file_system_type
*fs_type
,
590 int flags
, const char *dev_name
, void *data
, struct vfsmount
*mnt
)
592 return get_sb_bdev(fs_type
, flags
, dev_name
, data
, minix_fill_super
,
596 static struct file_system_type minix_fs_type
= {
597 .owner
= THIS_MODULE
,
599 .get_sb
= minix_get_sb
,
600 .kill_sb
= kill_block_super
,
601 .fs_flags
= FS_REQUIRES_DEV
,
604 static int __init
init_minix_fs(void)
606 int err
= init_inodecache();
609 err
= register_filesystem(&minix_fs_type
);
614 destroy_inodecache();
619 static void __exit
exit_minix_fs(void)
621 unregister_filesystem(&minix_fs_type
);
622 destroy_inodecache();
625 module_init(init_minix_fs
)
626 module_exit(exit_minix_fs
)
627 MODULE_LICENSE("GPL");