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
12 #include <linux/module.h>
14 #include <linux/buffer_head.h>
15 #include <linux/slab.h>
16 #include <linux/init.h>
17 #include <linux/highuid.h>
18 #include <linux/vfs.h>
20 static void minix_read_inode(struct inode
* inode
);
21 static int minix_write_inode(struct inode
* inode
, int wait
);
22 static int minix_statfs(struct dentry
*dentry
, struct kstatfs
*buf
);
23 static int minix_remount (struct super_block
* sb
, int * flags
, char * data
);
25 static void minix_delete_inode(struct inode
*inode
)
27 truncate_inode_pages(&inode
->i_data
, 0);
29 minix_truncate(inode
);
30 minix_free_inode(inode
);
33 static void minix_put_super(struct super_block
*sb
)
36 struct minix_sb_info
*sbi
= minix_sb(sb
);
38 if (!(sb
->s_flags
& MS_RDONLY
)) {
39 sbi
->s_ms
->s_state
= sbi
->s_mount_state
;
40 mark_buffer_dirty(sbi
->s_sbh
);
42 for (i
= 0; i
< sbi
->s_imap_blocks
; i
++)
43 brelse(sbi
->s_imap
[i
]);
44 for (i
= 0; i
< sbi
->s_zmap_blocks
; i
++)
45 brelse(sbi
->s_zmap
[i
]);
54 static kmem_cache_t
* minix_inode_cachep
;
56 static struct inode
*minix_alloc_inode(struct super_block
*sb
)
58 struct minix_inode_info
*ei
;
59 ei
= (struct minix_inode_info
*)kmem_cache_alloc(minix_inode_cachep
, SLAB_KERNEL
);
62 return &ei
->vfs_inode
;
65 static void minix_destroy_inode(struct inode
*inode
)
67 kmem_cache_free(minix_inode_cachep
, minix_i(inode
));
70 static void init_once(void * foo
, kmem_cache_t
* cachep
, unsigned long flags
)
72 struct minix_inode_info
*ei
= (struct minix_inode_info
*) foo
;
74 if ((flags
& (SLAB_CTOR_VERIFY
|SLAB_CTOR_CONSTRUCTOR
)) ==
75 SLAB_CTOR_CONSTRUCTOR
)
76 inode_init_once(&ei
->vfs_inode
);
79 static int init_inodecache(void)
81 minix_inode_cachep
= kmem_cache_create("minix_inode_cache",
82 sizeof(struct minix_inode_info
),
83 0, (SLAB_RECLAIM_ACCOUNT
|
86 if (minix_inode_cachep
== NULL
)
91 static void destroy_inodecache(void)
93 if (kmem_cache_destroy(minix_inode_cachep
))
94 printk(KERN_INFO
"minix_inode_cache: not all structures were freed\n");
97 static 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 ms
->s_state
= sbi
->s_mount_state
;
122 mark_buffer_dirty(sbi
->s_sbh
);
124 /* Mount a partition which is read-only, read-write. */
125 sbi
->s_mount_state
= ms
->s_state
;
126 ms
->s_state
&= ~MINIX_VALID_FS
;
127 mark_buffer_dirty(sbi
->s_sbh
);
129 if (!(sbi
->s_mount_state
& MINIX_VALID_FS
))
130 printk("MINIX-fs warning: remounting unchecked fs, "
131 "running fsck is recommended\n");
132 else if ((sbi
->s_mount_state
& MINIX_ERROR_FS
))
133 printk("MINIX-fs warning: remounting fs with errors, "
134 "running fsck is recommended\n");
139 static int minix_fill_super(struct super_block
*s
, void *data
, int silent
)
141 struct buffer_head
*bh
;
142 struct buffer_head
**map
;
143 struct minix_super_block
*ms
;
145 struct inode
*root_inode
;
146 struct minix_sb_info
*sbi
;
148 sbi
= kmalloc(sizeof(struct minix_sb_info
), GFP_KERNEL
);
152 memset(sbi
, 0, sizeof(struct minix_sb_info
));
154 /* N.B. These should be compile-time tests.
155 Unfortunately that is impossible. */
156 if (32 != sizeof (struct minix_inode
))
157 panic("bad V1 i-node size");
158 if (64 != sizeof(struct minix2_inode
))
159 panic("bad V2 i-node size");
161 if (!sb_set_blocksize(s
, BLOCK_SIZE
))
164 if (!(bh
= sb_bread(s
, 1)))
167 ms
= (struct minix_super_block
*) bh
->b_data
;
170 sbi
->s_mount_state
= ms
->s_state
;
171 sbi
->s_ninodes
= ms
->s_ninodes
;
172 sbi
->s_nzones
= ms
->s_nzones
;
173 sbi
->s_imap_blocks
= ms
->s_imap_blocks
;
174 sbi
->s_zmap_blocks
= ms
->s_zmap_blocks
;
175 sbi
->s_firstdatazone
= ms
->s_firstdatazone
;
176 sbi
->s_log_zone_size
= ms
->s_log_zone_size
;
177 sbi
->s_max_size
= ms
->s_max_size
;
178 s
->s_magic
= ms
->s_magic
;
179 if (s
->s_magic
== MINIX_SUPER_MAGIC
) {
180 sbi
->s_version
= MINIX_V1
;
183 sbi
->s_link_max
= MINIX_LINK_MAX
;
184 } else if (s
->s_magic
== MINIX_SUPER_MAGIC2
) {
185 sbi
->s_version
= MINIX_V1
;
188 sbi
->s_link_max
= MINIX_LINK_MAX
;
189 } else if (s
->s_magic
== MINIX2_SUPER_MAGIC
) {
190 sbi
->s_version
= MINIX_V2
;
191 sbi
->s_nzones
= ms
->s_zones
;
194 sbi
->s_link_max
= MINIX2_LINK_MAX
;
195 } else if (s
->s_magic
== MINIX2_SUPER_MAGIC2
) {
196 sbi
->s_version
= MINIX_V2
;
197 sbi
->s_nzones
= ms
->s_zones
;
200 sbi
->s_link_max
= MINIX2_LINK_MAX
;
205 * Allocate the buffer map to keep the superblock small.
207 if (sbi
->s_imap_blocks
== 0 || sbi
->s_zmap_blocks
== 0)
209 i
= (sbi
->s_imap_blocks
+ sbi
->s_zmap_blocks
) * sizeof(bh
);
210 map
= kmalloc(i
, GFP_KERNEL
);
214 sbi
->s_imap
= &map
[0];
215 sbi
->s_zmap
= &map
[sbi
->s_imap_blocks
];
218 for (i
=0 ; i
< sbi
->s_imap_blocks
; i
++) {
219 if (!(sbi
->s_imap
[i
]=sb_bread(s
, block
)))
223 for (i
=0 ; i
< sbi
->s_zmap_blocks
; i
++) {
224 if (!(sbi
->s_zmap
[i
]=sb_bread(s
, block
)))
229 minix_set_bit(0,sbi
->s_imap
[0]->b_data
);
230 minix_set_bit(0,sbi
->s_zmap
[0]->b_data
);
232 /* set up enough so that it can read an inode */
233 s
->s_op
= &minix_sops
;
234 root_inode
= iget(s
, MINIX_ROOT_INO
);
235 if (!root_inode
|| is_bad_inode(root_inode
))
238 s
->s_root
= d_alloc_root(root_inode
);
243 s
->s_root
->d_op
= &minix_dentry_operations
;
245 if (!(s
->s_flags
& MS_RDONLY
)) {
246 ms
->s_state
&= ~MINIX_VALID_FS
;
247 mark_buffer_dirty(bh
);
249 if (!(sbi
->s_mount_state
& MINIX_VALID_FS
))
250 printk("MINIX-fs: mounting unchecked file system, "
251 "running fsck is recommended\n");
252 else if (sbi
->s_mount_state
& MINIX_ERROR_FS
)
253 printk("MINIX-fs: mounting file system with errors, "
254 "running fsck is recommended\n");
263 printk("MINIX-fs: get root inode failed\n");
267 printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
269 for (i
= 0; i
< sbi
->s_imap_blocks
; i
++)
270 brelse(sbi
->s_imap
[i
]);
271 for (i
= 0; i
< sbi
->s_zmap_blocks
; i
++)
272 brelse(sbi
->s_zmap
[i
]);
278 printk("MINIX-fs: can't allocate map\n");
283 printk("MINIX-fs: bad superblock\n");
288 printk("VFS: Can't find a Minix or Minix V2 filesystem "
289 "on device %s\n", s
->s_id
);
295 printk("MINIX-fs: blocksize too small for device\n");
299 printk("MINIX-fs: unable to read superblock\n");
306 static int minix_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
308 struct minix_sb_info
*sbi
= minix_sb(dentry
->d_sb
);
309 buf
->f_type
= dentry
->d_sb
->s_magic
;
310 buf
->f_bsize
= dentry
->d_sb
->s_blocksize
;
311 buf
->f_blocks
= (sbi
->s_nzones
- sbi
->s_firstdatazone
) << sbi
->s_log_zone_size
;
312 buf
->f_bfree
= minix_count_free_blocks(sbi
);
313 buf
->f_bavail
= buf
->f_bfree
;
314 buf
->f_files
= sbi
->s_ninodes
;
315 buf
->f_ffree
= minix_count_free_inodes(sbi
);
316 buf
->f_namelen
= sbi
->s_namelen
;
320 static int minix_get_block(struct inode
*inode
, sector_t block
,
321 struct buffer_head
*bh_result
, int create
)
323 if (INODE_VERSION(inode
) == MINIX_V1
)
324 return V1_minix_get_block(inode
, block
, bh_result
, create
);
326 return V2_minix_get_block(inode
, block
, bh_result
, create
);
329 static int minix_writepage(struct page
*page
, struct writeback_control
*wbc
)
331 return block_write_full_page(page
, minix_get_block
, wbc
);
333 static int minix_readpage(struct file
*file
, struct page
*page
)
335 return block_read_full_page(page
,minix_get_block
);
337 static int minix_prepare_write(struct file
*file
, struct page
*page
, unsigned from
, unsigned to
)
339 return block_prepare_write(page
,from
,to
,minix_get_block
);
341 static sector_t
minix_bmap(struct address_space
*mapping
, sector_t block
)
343 return generic_block_bmap(mapping
,block
,minix_get_block
);
345 static const struct address_space_operations minix_aops
= {
346 .readpage
= minix_readpage
,
347 .writepage
= minix_writepage
,
348 .sync_page
= block_sync_page
,
349 .prepare_write
= minix_prepare_write
,
350 .commit_write
= generic_commit_write
,
354 static struct inode_operations minix_symlink_inode_operations
= {
355 .readlink
= generic_readlink
,
356 .follow_link
= page_follow_link_light
,
357 .put_link
= page_put_link
,
358 .getattr
= minix_getattr
,
361 void minix_set_inode(struct inode
*inode
, dev_t rdev
)
363 if (S_ISREG(inode
->i_mode
)) {
364 inode
->i_op
= &minix_file_inode_operations
;
365 inode
->i_fop
= &minix_file_operations
;
366 inode
->i_mapping
->a_ops
= &minix_aops
;
367 } else if (S_ISDIR(inode
->i_mode
)) {
368 inode
->i_op
= &minix_dir_inode_operations
;
369 inode
->i_fop
= &minix_dir_operations
;
370 inode
->i_mapping
->a_ops
= &minix_aops
;
371 } else if (S_ISLNK(inode
->i_mode
)) {
372 inode
->i_op
= &minix_symlink_inode_operations
;
373 inode
->i_mapping
->a_ops
= &minix_aops
;
375 init_special_inode(inode
, inode
->i_mode
, rdev
);
379 * The minix V1 function to read an inode.
381 static void V1_minix_read_inode(struct inode
* inode
)
383 struct buffer_head
* bh
;
384 struct minix_inode
* raw_inode
;
385 struct minix_inode_info
*minix_inode
= minix_i(inode
);
388 raw_inode
= minix_V1_raw_inode(inode
->i_sb
, inode
->i_ino
, &bh
);
390 make_bad_inode(inode
);
393 inode
->i_mode
= raw_inode
->i_mode
;
394 inode
->i_uid
= (uid_t
)raw_inode
->i_uid
;
395 inode
->i_gid
= (gid_t
)raw_inode
->i_gid
;
396 inode
->i_nlink
= raw_inode
->i_nlinks
;
397 inode
->i_size
= raw_inode
->i_size
;
398 inode
->i_mtime
.tv_sec
= inode
->i_atime
.tv_sec
= inode
->i_ctime
.tv_sec
= raw_inode
->i_time
;
399 inode
->i_mtime
.tv_nsec
= 0;
400 inode
->i_atime
.tv_nsec
= 0;
401 inode
->i_ctime
.tv_nsec
= 0;
402 inode
->i_blocks
= inode
->i_blksize
= 0;
403 for (i
= 0; i
< 9; i
++)
404 minix_inode
->u
.i1_data
[i
] = raw_inode
->i_zone
[i
];
405 minix_set_inode(inode
, old_decode_dev(raw_inode
->i_zone
[0]));
410 * The minix V2 function to read an inode.
412 static void V2_minix_read_inode(struct inode
* inode
)
414 struct buffer_head
* bh
;
415 struct minix2_inode
* raw_inode
;
416 struct minix_inode_info
*minix_inode
= minix_i(inode
);
419 raw_inode
= minix_V2_raw_inode(inode
->i_sb
, inode
->i_ino
, &bh
);
421 make_bad_inode(inode
);
424 inode
->i_mode
= raw_inode
->i_mode
;
425 inode
->i_uid
= (uid_t
)raw_inode
->i_uid
;
426 inode
->i_gid
= (gid_t
)raw_inode
->i_gid
;
427 inode
->i_nlink
= raw_inode
->i_nlinks
;
428 inode
->i_size
= raw_inode
->i_size
;
429 inode
->i_mtime
.tv_sec
= raw_inode
->i_mtime
;
430 inode
->i_atime
.tv_sec
= raw_inode
->i_atime
;
431 inode
->i_ctime
.tv_sec
= raw_inode
->i_ctime
;
432 inode
->i_mtime
.tv_nsec
= 0;
433 inode
->i_atime
.tv_nsec
= 0;
434 inode
->i_ctime
.tv_nsec
= 0;
435 inode
->i_blocks
= inode
->i_blksize
= 0;
436 for (i
= 0; i
< 10; i
++)
437 minix_inode
->u
.i2_data
[i
] = raw_inode
->i_zone
[i
];
438 minix_set_inode(inode
, old_decode_dev(raw_inode
->i_zone
[0]));
443 * The global function to read an inode.
445 static void minix_read_inode(struct inode
* inode
)
447 if (INODE_VERSION(inode
) == MINIX_V1
)
448 V1_minix_read_inode(inode
);
450 V2_minix_read_inode(inode
);
454 * The minix V1 function to synchronize an inode.
456 static struct buffer_head
* V1_minix_update_inode(struct inode
* inode
)
458 struct buffer_head
* bh
;
459 struct minix_inode
* raw_inode
;
460 struct minix_inode_info
*minix_inode
= minix_i(inode
);
463 raw_inode
= minix_V1_raw_inode(inode
->i_sb
, inode
->i_ino
, &bh
);
466 raw_inode
->i_mode
= inode
->i_mode
;
467 raw_inode
->i_uid
= fs_high2lowuid(inode
->i_uid
);
468 raw_inode
->i_gid
= fs_high2lowgid(inode
->i_gid
);
469 raw_inode
->i_nlinks
= inode
->i_nlink
;
470 raw_inode
->i_size
= inode
->i_size
;
471 raw_inode
->i_time
= inode
->i_mtime
.tv_sec
;
472 if (S_ISCHR(inode
->i_mode
) || S_ISBLK(inode
->i_mode
))
473 raw_inode
->i_zone
[0] = old_encode_dev(inode
->i_rdev
);
474 else for (i
= 0; i
< 9; i
++)
475 raw_inode
->i_zone
[i
] = minix_inode
->u
.i1_data
[i
];
476 mark_buffer_dirty(bh
);
481 * The minix V2 function to synchronize an inode.
483 static struct buffer_head
* V2_minix_update_inode(struct inode
* inode
)
485 struct buffer_head
* bh
;
486 struct minix2_inode
* raw_inode
;
487 struct minix_inode_info
*minix_inode
= minix_i(inode
);
490 raw_inode
= minix_V2_raw_inode(inode
->i_sb
, inode
->i_ino
, &bh
);
493 raw_inode
->i_mode
= inode
->i_mode
;
494 raw_inode
->i_uid
= fs_high2lowuid(inode
->i_uid
);
495 raw_inode
->i_gid
= fs_high2lowgid(inode
->i_gid
);
496 raw_inode
->i_nlinks
= inode
->i_nlink
;
497 raw_inode
->i_size
= inode
->i_size
;
498 raw_inode
->i_mtime
= inode
->i_mtime
.tv_sec
;
499 raw_inode
->i_atime
= inode
->i_atime
.tv_sec
;
500 raw_inode
->i_ctime
= inode
->i_ctime
.tv_sec
;
501 if (S_ISCHR(inode
->i_mode
) || S_ISBLK(inode
->i_mode
))
502 raw_inode
->i_zone
[0] = old_encode_dev(inode
->i_rdev
);
503 else for (i
= 0; i
< 10; i
++)
504 raw_inode
->i_zone
[i
] = minix_inode
->u
.i2_data
[i
];
505 mark_buffer_dirty(bh
);
509 static struct buffer_head
*minix_update_inode(struct inode
*inode
)
511 if (INODE_VERSION(inode
) == MINIX_V1
)
512 return V1_minix_update_inode(inode
);
514 return V2_minix_update_inode(inode
);
517 static int minix_write_inode(struct inode
* inode
, int wait
)
519 brelse(minix_update_inode(inode
));
523 int minix_sync_inode(struct inode
* inode
)
526 struct buffer_head
*bh
;
528 bh
= minix_update_inode(inode
);
529 if (bh
&& buffer_dirty(bh
))
531 sync_dirty_buffer(bh
);
532 if (buffer_req(bh
) && !buffer_uptodate(bh
))
534 printk("IO error syncing minix inode [%s:%08lx]\n",
535 inode
->i_sb
->s_id
, inode
->i_ino
);
545 int minix_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
547 generic_fillattr(dentry
->d_inode
, stat
);
548 if (INODE_VERSION(dentry
->d_inode
) == MINIX_V1
)
549 stat
->blocks
= (BLOCK_SIZE
/ 512) * V1_minix_blocks(stat
->size
);
551 stat
->blocks
= (BLOCK_SIZE
/ 512) * V2_minix_blocks(stat
->size
);
552 stat
->blksize
= BLOCK_SIZE
;
557 * The function that is called for file truncation.
559 void minix_truncate(struct inode
* inode
)
561 if (!(S_ISREG(inode
->i_mode
) || S_ISDIR(inode
->i_mode
) || S_ISLNK(inode
->i_mode
)))
563 if (INODE_VERSION(inode
) == MINIX_V1
)
564 V1_minix_truncate(inode
);
566 V2_minix_truncate(inode
);
569 static int minix_get_sb(struct file_system_type
*fs_type
,
570 int flags
, const char *dev_name
, void *data
, struct vfsmount
*mnt
)
572 return get_sb_bdev(fs_type
, flags
, dev_name
, data
, minix_fill_super
,
576 static struct file_system_type minix_fs_type
= {
577 .owner
= THIS_MODULE
,
579 .get_sb
= minix_get_sb
,
580 .kill_sb
= kill_block_super
,
581 .fs_flags
= FS_REQUIRES_DEV
,
584 static int __init
init_minix_fs(void)
586 int err
= init_inodecache();
589 err
= register_filesystem(&minix_fs_type
);
594 destroy_inodecache();
599 static void __exit
exit_minix_fs(void)
601 unregister_filesystem(&minix_fs_type
);
602 destroy_inodecache();
605 module_init(init_minix_fs
)
606 module_exit(exit_minix_fs
)
607 MODULE_LICENSE("GPL");