2 * linux/fs/minix/inode.c
4 * Copyright (C) 1991, 1992 Linus Torvalds
6 * Copyright (C) 1996 Gertjan van Wingerde
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>
20 #include <linux/writeback.h>
22 static int minix_write_inode(struct inode
*inode
,
23 struct writeback_control
*wbc
);
24 static int minix_statfs(struct dentry
*dentry
, struct kstatfs
*buf
);
25 static int minix_remount (struct super_block
* sb
, int * flags
, char * data
);
27 static void minix_evict_inode(struct inode
*inode
)
29 truncate_inode_pages_final(&inode
->i_data
);
30 if (!inode
->i_nlink
) {
32 minix_truncate(inode
);
34 invalidate_inode_buffers(inode
);
37 minix_free_inode(inode
);
40 static void minix_put_super(struct super_block
*sb
)
43 struct minix_sb_info
*sbi
= minix_sb(sb
);
45 if (!(sb
->s_flags
& MS_RDONLY
)) {
46 if (sbi
->s_version
!= MINIX_V3
) /* s_state is now out from V3 sb */
47 sbi
->s_ms
->s_state
= sbi
->s_mount_state
;
48 mark_buffer_dirty(sbi
->s_sbh
);
50 for (i
= 0; i
< sbi
->s_imap_blocks
; i
++)
51 brelse(sbi
->s_imap
[i
]);
52 for (i
= 0; i
< sbi
->s_zmap_blocks
; i
++)
53 brelse(sbi
->s_zmap
[i
]);
60 static struct kmem_cache
* minix_inode_cachep
;
62 static struct inode
*minix_alloc_inode(struct super_block
*sb
)
64 struct minix_inode_info
*ei
;
65 ei
= kmem_cache_alloc(minix_inode_cachep
, GFP_KERNEL
);
68 return &ei
->vfs_inode
;
71 static void minix_i_callback(struct rcu_head
*head
)
73 struct inode
*inode
= container_of(head
, struct inode
, i_rcu
);
74 kmem_cache_free(minix_inode_cachep
, minix_i(inode
));
77 static void minix_destroy_inode(struct inode
*inode
)
79 call_rcu(&inode
->i_rcu
, minix_i_callback
);
82 static void init_once(void *foo
)
84 struct minix_inode_info
*ei
= (struct minix_inode_info
*) foo
;
86 inode_init_once(&ei
->vfs_inode
);
89 static int __init
init_inodecache(void)
91 minix_inode_cachep
= kmem_cache_create("minix_inode_cache",
92 sizeof(struct minix_inode_info
),
93 0, (SLAB_RECLAIM_ACCOUNT
|
96 if (minix_inode_cachep
== NULL
)
101 static void destroy_inodecache(void)
104 * Make sure all delayed rcu free inodes are flushed before we
108 kmem_cache_destroy(minix_inode_cachep
);
111 static const struct super_operations minix_sops
= {
112 .alloc_inode
= minix_alloc_inode
,
113 .destroy_inode
= minix_destroy_inode
,
114 .write_inode
= minix_write_inode
,
115 .evict_inode
= minix_evict_inode
,
116 .put_super
= minix_put_super
,
117 .statfs
= minix_statfs
,
118 .remount_fs
= minix_remount
,
121 static int minix_remount (struct super_block
* sb
, int * flags
, char * data
)
123 struct minix_sb_info
* sbi
= minix_sb(sb
);
124 struct minix_super_block
* ms
;
128 if ((*flags
& MS_RDONLY
) == (sb
->s_flags
& MS_RDONLY
))
130 if (*flags
& MS_RDONLY
) {
131 if (ms
->s_state
& MINIX_VALID_FS
||
132 !(sbi
->s_mount_state
& MINIX_VALID_FS
))
134 /* Mounting a rw partition read-only. */
135 if (sbi
->s_version
!= MINIX_V3
)
136 ms
->s_state
= sbi
->s_mount_state
;
137 mark_buffer_dirty(sbi
->s_sbh
);
139 /* Mount a partition which is read-only, read-write. */
140 if (sbi
->s_version
!= MINIX_V3
) {
141 sbi
->s_mount_state
= ms
->s_state
;
142 ms
->s_state
&= ~MINIX_VALID_FS
;
144 sbi
->s_mount_state
= MINIX_VALID_FS
;
146 mark_buffer_dirty(sbi
->s_sbh
);
148 if (!(sbi
->s_mount_state
& MINIX_VALID_FS
))
149 printk("MINIX-fs warning: remounting unchecked fs, "
150 "running fsck is recommended\n");
151 else if ((sbi
->s_mount_state
& MINIX_ERROR_FS
))
152 printk("MINIX-fs warning: remounting fs with errors, "
153 "running fsck is recommended\n");
158 static int minix_fill_super(struct super_block
*s
, void *data
, int silent
)
160 struct buffer_head
*bh
;
161 struct buffer_head
**map
;
162 struct minix_super_block
*ms
;
163 struct minix3_super_block
*m3s
= NULL
;
164 unsigned long i
, block
;
165 struct inode
*root_inode
;
166 struct minix_sb_info
*sbi
;
169 sbi
= kzalloc(sizeof(struct minix_sb_info
), GFP_KERNEL
);
174 BUILD_BUG_ON(32 != sizeof (struct minix_inode
));
175 BUILD_BUG_ON(64 != sizeof(struct minix2_inode
));
177 if (!sb_set_blocksize(s
, BLOCK_SIZE
))
180 if (!(bh
= sb_bread(s
, 1)))
183 ms
= (struct minix_super_block
*) bh
->b_data
;
186 sbi
->s_mount_state
= ms
->s_state
;
187 sbi
->s_ninodes
= ms
->s_ninodes
;
188 sbi
->s_nzones
= ms
->s_nzones
;
189 sbi
->s_imap_blocks
= ms
->s_imap_blocks
;
190 sbi
->s_zmap_blocks
= ms
->s_zmap_blocks
;
191 sbi
->s_firstdatazone
= ms
->s_firstdatazone
;
192 sbi
->s_log_zone_size
= ms
->s_log_zone_size
;
193 sbi
->s_max_size
= ms
->s_max_size
;
194 s
->s_magic
= ms
->s_magic
;
195 if (s
->s_magic
== MINIX_SUPER_MAGIC
) {
196 sbi
->s_version
= MINIX_V1
;
199 s
->s_max_links
= MINIX_LINK_MAX
;
200 } else if (s
->s_magic
== MINIX_SUPER_MAGIC2
) {
201 sbi
->s_version
= MINIX_V1
;
204 s
->s_max_links
= MINIX_LINK_MAX
;
205 } else if (s
->s_magic
== MINIX2_SUPER_MAGIC
) {
206 sbi
->s_version
= MINIX_V2
;
207 sbi
->s_nzones
= ms
->s_zones
;
210 s
->s_max_links
= MINIX2_LINK_MAX
;
211 } else if (s
->s_magic
== MINIX2_SUPER_MAGIC2
) {
212 sbi
->s_version
= MINIX_V2
;
213 sbi
->s_nzones
= ms
->s_zones
;
216 s
->s_max_links
= MINIX2_LINK_MAX
;
217 } else if ( *(__u16
*)(bh
->b_data
+ 24) == MINIX3_SUPER_MAGIC
) {
218 m3s
= (struct minix3_super_block
*) bh
->b_data
;
219 s
->s_magic
= m3s
->s_magic
;
220 sbi
->s_imap_blocks
= m3s
->s_imap_blocks
;
221 sbi
->s_zmap_blocks
= m3s
->s_zmap_blocks
;
222 sbi
->s_firstdatazone
= m3s
->s_firstdatazone
;
223 sbi
->s_log_zone_size
= m3s
->s_log_zone_size
;
224 sbi
->s_max_size
= m3s
->s_max_size
;
225 sbi
->s_ninodes
= m3s
->s_ninodes
;
226 sbi
->s_nzones
= m3s
->s_zones
;
229 sbi
->s_version
= MINIX_V3
;
230 sbi
->s_mount_state
= MINIX_VALID_FS
;
231 sb_set_blocksize(s
, m3s
->s_blocksize
);
232 s
->s_max_links
= MINIX2_LINK_MAX
;
237 * Allocate the buffer map to keep the superblock small.
239 if (sbi
->s_imap_blocks
== 0 || sbi
->s_zmap_blocks
== 0)
241 i
= (sbi
->s_imap_blocks
+ sbi
->s_zmap_blocks
) * sizeof(bh
);
242 map
= kzalloc(i
, GFP_KERNEL
);
245 sbi
->s_imap
= &map
[0];
246 sbi
->s_zmap
= &map
[sbi
->s_imap_blocks
];
249 for (i
=0 ; i
< sbi
->s_imap_blocks
; i
++) {
250 if (!(sbi
->s_imap
[i
]=sb_bread(s
, block
)))
254 for (i
=0 ; i
< sbi
->s_zmap_blocks
; i
++) {
255 if (!(sbi
->s_zmap
[i
]=sb_bread(s
, block
)))
260 minix_set_bit(0,sbi
->s_imap
[0]->b_data
);
261 minix_set_bit(0,sbi
->s_zmap
[0]->b_data
);
263 /* Apparently minix can create filesystems that allocate more blocks for
264 * the bitmaps than needed. We simply ignore that, but verify it didn't
265 * create one with not enough blocks and bail out if so.
267 block
= minix_blocks_needed(sbi
->s_ninodes
, s
->s_blocksize
);
268 if (sbi
->s_imap_blocks
< block
) {
269 printk("MINIX-fs: file system does not have enough "
270 "imap blocks allocated. Refusing to mount.\n");
274 block
= minix_blocks_needed(
275 (sbi
->s_nzones
- sbi
->s_firstdatazone
+ 1),
277 if (sbi
->s_zmap_blocks
< block
) {
278 printk("MINIX-fs: file system does not have enough "
279 "zmap blocks allocated. Refusing to mount.\n");
283 /* set up enough so that it can read an inode */
284 s
->s_op
= &minix_sops
;
285 root_inode
= minix_iget(s
, MINIX_ROOT_INO
);
286 if (IS_ERR(root_inode
)) {
287 ret
= PTR_ERR(root_inode
);
292 s
->s_root
= d_make_root(root_inode
);
296 if (!(s
->s_flags
& MS_RDONLY
)) {
297 if (sbi
->s_version
!= MINIX_V3
) /* s_state is now out from V3 sb */
298 ms
->s_state
&= ~MINIX_VALID_FS
;
299 mark_buffer_dirty(bh
);
301 if (!(sbi
->s_mount_state
& MINIX_VALID_FS
))
302 printk("MINIX-fs: mounting unchecked file system, "
303 "running fsck is recommended\n");
304 else if (sbi
->s_mount_state
& MINIX_ERROR_FS
)
305 printk("MINIX-fs: mounting file system with errors, "
306 "running fsck is recommended\n");
312 printk("MINIX-fs: get root inode failed\n");
316 printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
318 for (i
= 0; i
< sbi
->s_imap_blocks
; i
++)
319 brelse(sbi
->s_imap
[i
]);
320 for (i
= 0; i
< sbi
->s_zmap_blocks
; i
++)
321 brelse(sbi
->s_zmap
[i
]);
328 printk("MINIX-fs: can't allocate map\n");
333 printk("MINIX-fs: bad superblock\n");
338 printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 "
339 "on device %s.\n", s
->s_id
);
345 printk("MINIX-fs: blocksize too small for device\n");
349 printk("MINIX-fs: unable to read superblock\n");
356 static int minix_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
358 struct super_block
*sb
= dentry
->d_sb
;
359 struct minix_sb_info
*sbi
= minix_sb(sb
);
360 u64 id
= huge_encode_dev(sb
->s_bdev
->bd_dev
);
361 buf
->f_type
= sb
->s_magic
;
362 buf
->f_bsize
= sb
->s_blocksize
;
363 buf
->f_blocks
= (sbi
->s_nzones
- sbi
->s_firstdatazone
) << sbi
->s_log_zone_size
;
364 buf
->f_bfree
= minix_count_free_blocks(sb
);
365 buf
->f_bavail
= buf
->f_bfree
;
366 buf
->f_files
= sbi
->s_ninodes
;
367 buf
->f_ffree
= minix_count_free_inodes(sb
);
368 buf
->f_namelen
= sbi
->s_namelen
;
369 buf
->f_fsid
.val
[0] = (u32
)id
;
370 buf
->f_fsid
.val
[1] = (u32
)(id
>> 32);
375 static int minix_get_block(struct inode
*inode
, sector_t block
,
376 struct buffer_head
*bh_result
, int create
)
378 if (INODE_VERSION(inode
) == MINIX_V1
)
379 return V1_minix_get_block(inode
, block
, bh_result
, create
);
381 return V2_minix_get_block(inode
, block
, bh_result
, create
);
384 static int minix_writepage(struct page
*page
, struct writeback_control
*wbc
)
386 return block_write_full_page(page
, minix_get_block
, wbc
);
389 static int minix_readpage(struct file
*file
, struct page
*page
)
391 return block_read_full_page(page
,minix_get_block
);
394 int minix_prepare_chunk(struct page
*page
, loff_t pos
, unsigned len
)
396 return __block_write_begin(page
, pos
, len
, minix_get_block
);
399 static void minix_write_failed(struct address_space
*mapping
, loff_t to
)
401 struct inode
*inode
= mapping
->host
;
403 if (to
> inode
->i_size
) {
404 truncate_pagecache(inode
, inode
->i_size
);
405 minix_truncate(inode
);
409 static int minix_write_begin(struct file
*file
, struct address_space
*mapping
,
410 loff_t pos
, unsigned len
, unsigned flags
,
411 struct page
**pagep
, void **fsdata
)
415 ret
= block_write_begin(mapping
, pos
, len
, flags
, pagep
,
418 minix_write_failed(mapping
, pos
+ len
);
423 static sector_t
minix_bmap(struct address_space
*mapping
, sector_t block
)
425 return generic_block_bmap(mapping
,block
,minix_get_block
);
428 static const struct address_space_operations minix_aops
= {
429 .readpage
= minix_readpage
,
430 .writepage
= minix_writepage
,
431 .write_begin
= minix_write_begin
,
432 .write_end
= generic_write_end
,
436 static const struct inode_operations minix_symlink_inode_operations
= {
437 .readlink
= generic_readlink
,
438 .follow_link
= page_follow_link_light
,
439 .put_link
= page_put_link
,
440 .getattr
= minix_getattr
,
443 void minix_set_inode(struct inode
*inode
, dev_t rdev
)
445 if (S_ISREG(inode
->i_mode
)) {
446 inode
->i_op
= &minix_file_inode_operations
;
447 inode
->i_fop
= &minix_file_operations
;
448 inode
->i_mapping
->a_ops
= &minix_aops
;
449 } else if (S_ISDIR(inode
->i_mode
)) {
450 inode
->i_op
= &minix_dir_inode_operations
;
451 inode
->i_fop
= &minix_dir_operations
;
452 inode
->i_mapping
->a_ops
= &minix_aops
;
453 } else if (S_ISLNK(inode
->i_mode
)) {
454 inode
->i_op
= &minix_symlink_inode_operations
;
455 inode_nohighmem(inode
);
456 inode
->i_mapping
->a_ops
= &minix_aops
;
458 init_special_inode(inode
, inode
->i_mode
, rdev
);
462 * The minix V1 function to read an inode.
464 static struct inode
*V1_minix_iget(struct inode
*inode
)
466 struct buffer_head
* bh
;
467 struct minix_inode
* raw_inode
;
468 struct minix_inode_info
*minix_inode
= minix_i(inode
);
471 raw_inode
= minix_V1_raw_inode(inode
->i_sb
, inode
->i_ino
, &bh
);
474 return ERR_PTR(-EIO
);
476 inode
->i_mode
= raw_inode
->i_mode
;
477 i_uid_write(inode
, raw_inode
->i_uid
);
478 i_gid_write(inode
, raw_inode
->i_gid
);
479 set_nlink(inode
, raw_inode
->i_nlinks
);
480 inode
->i_size
= raw_inode
->i_size
;
481 inode
->i_mtime
.tv_sec
= inode
->i_atime
.tv_sec
= inode
->i_ctime
.tv_sec
= raw_inode
->i_time
;
482 inode
->i_mtime
.tv_nsec
= 0;
483 inode
->i_atime
.tv_nsec
= 0;
484 inode
->i_ctime
.tv_nsec
= 0;
486 for (i
= 0; i
< 9; i
++)
487 minix_inode
->u
.i1_data
[i
] = raw_inode
->i_zone
[i
];
488 minix_set_inode(inode
, old_decode_dev(raw_inode
->i_zone
[0]));
490 unlock_new_inode(inode
);
495 * The minix V2 function to read an inode.
497 static struct inode
*V2_minix_iget(struct inode
*inode
)
499 struct buffer_head
* bh
;
500 struct minix2_inode
* raw_inode
;
501 struct minix_inode_info
*minix_inode
= minix_i(inode
);
504 raw_inode
= minix_V2_raw_inode(inode
->i_sb
, inode
->i_ino
, &bh
);
507 return ERR_PTR(-EIO
);
509 inode
->i_mode
= raw_inode
->i_mode
;
510 i_uid_write(inode
, raw_inode
->i_uid
);
511 i_gid_write(inode
, raw_inode
->i_gid
);
512 set_nlink(inode
, raw_inode
->i_nlinks
);
513 inode
->i_size
= raw_inode
->i_size
;
514 inode
->i_mtime
.tv_sec
= raw_inode
->i_mtime
;
515 inode
->i_atime
.tv_sec
= raw_inode
->i_atime
;
516 inode
->i_ctime
.tv_sec
= raw_inode
->i_ctime
;
517 inode
->i_mtime
.tv_nsec
= 0;
518 inode
->i_atime
.tv_nsec
= 0;
519 inode
->i_ctime
.tv_nsec
= 0;
521 for (i
= 0; i
< 10; i
++)
522 minix_inode
->u
.i2_data
[i
] = raw_inode
->i_zone
[i
];
523 minix_set_inode(inode
, old_decode_dev(raw_inode
->i_zone
[0]));
525 unlock_new_inode(inode
);
530 * The global function to read an inode.
532 struct inode
*minix_iget(struct super_block
*sb
, unsigned long ino
)
536 inode
= iget_locked(sb
, ino
);
538 return ERR_PTR(-ENOMEM
);
539 if (!(inode
->i_state
& I_NEW
))
542 if (INODE_VERSION(inode
) == MINIX_V1
)
543 return V1_minix_iget(inode
);
545 return V2_minix_iget(inode
);
549 * The minix V1 function to synchronize an inode.
551 static struct buffer_head
* V1_minix_update_inode(struct inode
* inode
)
553 struct buffer_head
* bh
;
554 struct minix_inode
* raw_inode
;
555 struct minix_inode_info
*minix_inode
= minix_i(inode
);
558 raw_inode
= minix_V1_raw_inode(inode
->i_sb
, inode
->i_ino
, &bh
);
561 raw_inode
->i_mode
= inode
->i_mode
;
562 raw_inode
->i_uid
= fs_high2lowuid(i_uid_read(inode
));
563 raw_inode
->i_gid
= fs_high2lowgid(i_gid_read(inode
));
564 raw_inode
->i_nlinks
= inode
->i_nlink
;
565 raw_inode
->i_size
= inode
->i_size
;
566 raw_inode
->i_time
= inode
->i_mtime
.tv_sec
;
567 if (S_ISCHR(inode
->i_mode
) || S_ISBLK(inode
->i_mode
))
568 raw_inode
->i_zone
[0] = old_encode_dev(inode
->i_rdev
);
569 else for (i
= 0; i
< 9; i
++)
570 raw_inode
->i_zone
[i
] = minix_inode
->u
.i1_data
[i
];
571 mark_buffer_dirty(bh
);
576 * The minix V2 function to synchronize an inode.
578 static struct buffer_head
* V2_minix_update_inode(struct inode
* inode
)
580 struct buffer_head
* bh
;
581 struct minix2_inode
* raw_inode
;
582 struct minix_inode_info
*minix_inode
= minix_i(inode
);
585 raw_inode
= minix_V2_raw_inode(inode
->i_sb
, inode
->i_ino
, &bh
);
588 raw_inode
->i_mode
= inode
->i_mode
;
589 raw_inode
->i_uid
= fs_high2lowuid(i_uid_read(inode
));
590 raw_inode
->i_gid
= fs_high2lowgid(i_gid_read(inode
));
591 raw_inode
->i_nlinks
= inode
->i_nlink
;
592 raw_inode
->i_size
= inode
->i_size
;
593 raw_inode
->i_mtime
= inode
->i_mtime
.tv_sec
;
594 raw_inode
->i_atime
= inode
->i_atime
.tv_sec
;
595 raw_inode
->i_ctime
= inode
->i_ctime
.tv_sec
;
596 if (S_ISCHR(inode
->i_mode
) || S_ISBLK(inode
->i_mode
))
597 raw_inode
->i_zone
[0] = old_encode_dev(inode
->i_rdev
);
598 else for (i
= 0; i
< 10; i
++)
599 raw_inode
->i_zone
[i
] = minix_inode
->u
.i2_data
[i
];
600 mark_buffer_dirty(bh
);
604 static int minix_write_inode(struct inode
*inode
, struct writeback_control
*wbc
)
607 struct buffer_head
*bh
;
609 if (INODE_VERSION(inode
) == MINIX_V1
)
610 bh
= V1_minix_update_inode(inode
);
612 bh
= V2_minix_update_inode(inode
);
615 if (wbc
->sync_mode
== WB_SYNC_ALL
&& buffer_dirty(bh
)) {
616 sync_dirty_buffer(bh
);
617 if (buffer_req(bh
) && !buffer_uptodate(bh
)) {
618 printk("IO error syncing minix inode [%s:%08lx]\n",
619 inode
->i_sb
->s_id
, inode
->i_ino
);
627 int minix_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
629 struct super_block
*sb
= dentry
->d_sb
;
630 generic_fillattr(d_inode(dentry
), stat
);
631 if (INODE_VERSION(d_inode(dentry
)) == MINIX_V1
)
632 stat
->blocks
= (BLOCK_SIZE
/ 512) * V1_minix_blocks(stat
->size
, sb
);
634 stat
->blocks
= (sb
->s_blocksize
/ 512) * V2_minix_blocks(stat
->size
, sb
);
635 stat
->blksize
= sb
->s_blocksize
;
640 * The function that is called for file truncation.
642 void minix_truncate(struct inode
* inode
)
644 if (!(S_ISREG(inode
->i_mode
) || S_ISDIR(inode
->i_mode
) || S_ISLNK(inode
->i_mode
)))
646 if (INODE_VERSION(inode
) == MINIX_V1
)
647 V1_minix_truncate(inode
);
649 V2_minix_truncate(inode
);
652 static struct dentry
*minix_mount(struct file_system_type
*fs_type
,
653 int flags
, const char *dev_name
, void *data
)
655 return mount_bdev(fs_type
, flags
, dev_name
, data
, minix_fill_super
);
658 static struct file_system_type minix_fs_type
= {
659 .owner
= THIS_MODULE
,
661 .mount
= minix_mount
,
662 .kill_sb
= kill_block_super
,
663 .fs_flags
= FS_REQUIRES_DEV
,
665 MODULE_ALIAS_FS("minix");
667 static int __init
init_minix_fs(void)
669 int err
= init_inodecache();
672 err
= register_filesystem(&minix_fs_type
);
677 destroy_inodecache();
682 static void __exit
exit_minix_fs(void)
684 unregister_filesystem(&minix_fs_type
);
685 destroy_inodecache();
688 module_init(init_minix_fs
)
689 module_exit(exit_minix_fs
)
690 MODULE_LICENSE("GPL");