4 * Copyright (C) 1995-1997 Paul H. Hargrove
5 * (C) 2003 Ardis Technologies <roman@ardistech.com>
6 * This file may be distributed under the terms of the GNU General Public License.
8 * This file contains inode-related functions which do not depend on
9 * which scheme is being used to represent forks.
11 * Based on the minix file system code, (C) 1991, 1992 by Linus Torvalds
14 #include <linux/pagemap.h>
15 #include <linux/mpage.h>
20 static const struct file_operations hfs_file_operations
;
21 static struct inode_operations hfs_file_inode_operations
;
23 /*================ Variable-like macros ================*/
25 #define HFS_VALID_MODE_BITS (S_IFREG | S_IFDIR | S_IRWXUGO)
27 static int hfs_writepage(struct page
*page
, struct writeback_control
*wbc
)
29 return block_write_full_page(page
, hfs_get_block
, wbc
);
32 static int hfs_readpage(struct file
*file
, struct page
*page
)
34 return block_read_full_page(page
, hfs_get_block
);
37 static int hfs_prepare_write(struct file
*file
, struct page
*page
, unsigned from
, unsigned to
)
39 return cont_prepare_write(page
, from
, to
, hfs_get_block
,
40 &HFS_I(page
->mapping
->host
)->phys_size
);
43 static sector_t
hfs_bmap(struct address_space
*mapping
, sector_t block
)
45 return generic_block_bmap(mapping
, block
, hfs_get_block
);
48 static int hfs_releasepage(struct page
*page
, gfp_t mask
)
50 struct inode
*inode
= page
->mapping
->host
;
51 struct super_block
*sb
= inode
->i_sb
;
52 struct hfs_btree
*tree
;
53 struct hfs_bnode
*node
;
57 switch (inode
->i_ino
) {
59 tree
= HFS_SB(sb
)->ext_tree
;
62 tree
= HFS_SB(sb
)->cat_tree
;
68 if (tree
->node_size
>= PAGE_CACHE_SIZE
) {
69 nidx
= page
->index
>> (tree
->node_size_shift
- PAGE_CACHE_SHIFT
);
70 spin_lock(&tree
->hash_lock
);
71 node
= hfs_bnode_findhash(tree
, nidx
);
74 else if (atomic_read(&node
->refcnt
))
77 hfs_bnode_unhash(node
);
80 spin_unlock(&tree
->hash_lock
);
82 nidx
= page
->index
<< (PAGE_CACHE_SHIFT
- tree
->node_size_shift
);
83 i
= 1 << (PAGE_CACHE_SHIFT
- tree
->node_size_shift
);
84 spin_lock(&tree
->hash_lock
);
86 node
= hfs_bnode_findhash(tree
, nidx
++);
89 if (atomic_read(&node
->refcnt
)) {
93 hfs_bnode_unhash(node
);
95 } while (--i
&& nidx
< tree
->node_count
);
96 spin_unlock(&tree
->hash_lock
);
98 return res
? try_to_free_buffers(page
) : 0;
101 #ifdef CONFIG_DIRECTIO
102 static ssize_t
hfs_direct_IO(int rw
, struct kiocb
*iocb
,
103 const struct iovec
*iov
, loff_t offset
, unsigned long nr_segs
)
105 struct file
*file
= iocb
->ki_filp
;
106 struct inode
*inode
= file
->f_dentry
->d_inode
->i_mapping
->host
;
108 return blockdev_direct_IO(rw
, iocb
, inode
, inode
->i_sb
->s_bdev
, iov
,
109 offset
, nr_segs
, hfs_get_block
, NULL
);
113 static int hfs_writepages(struct address_space
*mapping
,
114 struct writeback_control
*wbc
)
116 return mpage_writepages(mapping
, wbc
, hfs_get_block
);
119 const struct address_space_operations hfs_btree_aops
= {
120 .readpage
= hfs_readpage
,
121 .writepage
= hfs_writepage
,
122 .sync_page
= block_sync_page
,
123 .prepare_write
= hfs_prepare_write
,
124 .commit_write
= generic_commit_write
,
126 .releasepage
= hfs_releasepage
,
129 const struct address_space_operations hfs_aops
= {
130 .readpage
= hfs_readpage
,
131 .writepage
= hfs_writepage
,
132 .sync_page
= block_sync_page
,
133 .prepare_write
= hfs_prepare_write
,
134 .commit_write
= generic_commit_write
,
136 #ifdef CONFIG_DIRECTIO
137 .direct_IO
= hfs_direct_IO
,
139 .writepages
= hfs_writepages
,
145 struct inode
*hfs_new_inode(struct inode
*dir
, struct qstr
*name
, int mode
)
147 struct super_block
*sb
= dir
->i_sb
;
148 struct inode
*inode
= new_inode(sb
);
152 init_MUTEX(&HFS_I(inode
)->extents_lock
);
153 INIT_LIST_HEAD(&HFS_I(inode
)->open_dir_list
);
154 hfs_cat_build_key(sb
, (btree_key
*)&HFS_I(inode
)->cat_key
, dir
->i_ino
, name
);
155 inode
->i_ino
= HFS_SB(sb
)->next_id
++;
156 inode
->i_mode
= mode
;
157 inode
->i_uid
= current
->fsuid
;
158 inode
->i_gid
= current
->fsgid
;
160 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME_SEC
;
161 HFS_I(inode
)->flags
= 0;
162 HFS_I(inode
)->rsrc_inode
= NULL
;
163 HFS_I(inode
)->fs_blocks
= 0;
166 HFS_SB(sb
)->folder_count
++;
167 if (dir
->i_ino
== HFS_ROOT_CNID
)
168 HFS_SB(sb
)->root_dirs
++;
169 inode
->i_op
= &hfs_dir_inode_operations
;
170 inode
->i_fop
= &hfs_dir_operations
;
171 inode
->i_mode
|= S_IRWXUGO
;
172 inode
->i_mode
&= ~HFS_SB(inode
->i_sb
)->s_dir_umask
;
173 } else if (S_ISREG(mode
)) {
174 HFS_I(inode
)->clump_blocks
= HFS_SB(sb
)->clumpablks
;
175 HFS_SB(sb
)->file_count
++;
176 if (dir
->i_ino
== HFS_ROOT_CNID
)
177 HFS_SB(sb
)->root_files
++;
178 inode
->i_op
= &hfs_file_inode_operations
;
179 inode
->i_fop
= &hfs_file_operations
;
180 inode
->i_mapping
->a_ops
= &hfs_aops
;
181 inode
->i_mode
|= S_IRUGO
|S_IXUGO
;
183 inode
->i_mode
|= S_IWUGO
;
184 inode
->i_mode
&= ~HFS_SB(inode
->i_sb
)->s_file_umask
;
185 HFS_I(inode
)->phys_size
= 0;
186 HFS_I(inode
)->alloc_blocks
= 0;
187 HFS_I(inode
)->first_blocks
= 0;
188 HFS_I(inode
)->cached_start
= 0;
189 HFS_I(inode
)->cached_blocks
= 0;
190 memset(HFS_I(inode
)->first_extents
, 0, sizeof(hfs_extent_rec
));
191 memset(HFS_I(inode
)->cached_extents
, 0, sizeof(hfs_extent_rec
));
193 insert_inode_hash(inode
);
194 mark_inode_dirty(inode
);
195 set_bit(HFS_FLG_MDB_DIRTY
, &HFS_SB(sb
)->flags
);
201 void hfs_delete_inode(struct inode
*inode
)
203 struct super_block
*sb
= inode
->i_sb
;
205 dprint(DBG_INODE
, "delete_inode: %lu\n", inode
->i_ino
);
206 if (S_ISDIR(inode
->i_mode
)) {
207 HFS_SB(sb
)->folder_count
--;
208 if (HFS_I(inode
)->cat_key
.ParID
== cpu_to_be32(HFS_ROOT_CNID
))
209 HFS_SB(sb
)->root_dirs
--;
210 set_bit(HFS_FLG_MDB_DIRTY
, &HFS_SB(sb
)->flags
);
214 HFS_SB(sb
)->file_count
--;
215 if (HFS_I(inode
)->cat_key
.ParID
== cpu_to_be32(HFS_ROOT_CNID
))
216 HFS_SB(sb
)->root_files
--;
217 if (S_ISREG(inode
->i_mode
)) {
218 if (!inode
->i_nlink
) {
220 hfs_file_truncate(inode
);
223 set_bit(HFS_FLG_MDB_DIRTY
, &HFS_SB(sb
)->flags
);
227 void hfs_inode_read_fork(struct inode
*inode
, struct hfs_extent
*ext
,
228 __be32 __log_size
, __be32 phys_size
, u32 clump_size
)
230 struct super_block
*sb
= inode
->i_sb
;
231 u32 log_size
= be32_to_cpu(__log_size
);
235 memcpy(HFS_I(inode
)->first_extents
, ext
, sizeof(hfs_extent_rec
));
236 for (count
= 0, i
= 0; i
< 3; i
++)
237 count
+= be16_to_cpu(ext
[i
].count
);
238 HFS_I(inode
)->first_blocks
= count
;
240 inode
->i_size
= HFS_I(inode
)->phys_size
= log_size
;
241 HFS_I(inode
)->fs_blocks
= (log_size
+ sb
->s_blocksize
- 1) >> sb
->s_blocksize_bits
;
242 inode_set_bytes(inode
, HFS_I(inode
)->fs_blocks
<< sb
->s_blocksize_bits
);
243 HFS_I(inode
)->alloc_blocks
= be32_to_cpu(phys_size
) /
244 HFS_SB(sb
)->alloc_blksz
;
245 HFS_I(inode
)->clump_blocks
= clump_size
/ HFS_SB(sb
)->alloc_blksz
;
246 if (!HFS_I(inode
)->clump_blocks
)
247 HFS_I(inode
)->clump_blocks
= HFS_SB(sb
)->clumpablks
;
250 struct hfs_iget_data
{
251 struct hfs_cat_key
*key
;
255 static int hfs_test_inode(struct inode
*inode
, void *data
)
257 struct hfs_iget_data
*idata
= data
;
263 return inode
->i_ino
== be32_to_cpu(rec
->dir
.DirID
);
265 return inode
->i_ino
== be32_to_cpu(rec
->file
.FlNum
);
275 static int hfs_read_inode(struct inode
*inode
, void *data
)
277 struct hfs_iget_data
*idata
= data
;
278 struct hfs_sb_info
*hsb
= HFS_SB(inode
->i_sb
);
281 HFS_I(inode
)->flags
= 0;
282 HFS_I(inode
)->rsrc_inode
= NULL
;
283 init_MUTEX(&HFS_I(inode
)->extents_lock
);
284 INIT_LIST_HEAD(&HFS_I(inode
)->open_dir_list
);
286 /* Initialize the inode */
287 inode
->i_uid
= hsb
->s_uid
;
288 inode
->i_gid
= hsb
->s_gid
;
292 HFS_I(inode
)->cat_key
= *idata
->key
;
294 HFS_I(inode
)->flags
|= HFS_FLG_RSRC
;
295 HFS_I(inode
)->tz_secondswest
= sys_tz
.tz_minuteswest
* 60;
300 if (!HFS_IS_RSRC(inode
)) {
301 hfs_inode_read_fork(inode
, rec
->file
.ExtRec
, rec
->file
.LgLen
,
302 rec
->file
.PyLen
, be16_to_cpu(rec
->file
.ClpSize
));
304 hfs_inode_read_fork(inode
, rec
->file
.RExtRec
, rec
->file
.RLgLen
,
305 rec
->file
.RPyLen
, be16_to_cpu(rec
->file
.ClpSize
));
308 inode
->i_ino
= be32_to_cpu(rec
->file
.FlNum
);
309 inode
->i_mode
= S_IRUGO
| S_IXUGO
;
310 if (!(rec
->file
.Flags
& HFS_FIL_LOCK
))
311 inode
->i_mode
|= S_IWUGO
;
312 inode
->i_mode
&= ~hsb
->s_file_umask
;
313 inode
->i_mode
|= S_IFREG
;
314 inode
->i_ctime
= inode
->i_atime
= inode
->i_mtime
=
315 hfs_m_to_utime(rec
->file
.MdDat
);
316 inode
->i_op
= &hfs_file_inode_operations
;
317 inode
->i_fop
= &hfs_file_operations
;
318 inode
->i_mapping
->a_ops
= &hfs_aops
;
321 inode
->i_ino
= be32_to_cpu(rec
->dir
.DirID
);
322 inode
->i_size
= be16_to_cpu(rec
->dir
.Val
) + 2;
323 HFS_I(inode
)->fs_blocks
= 0;
324 inode
->i_mode
= S_IFDIR
| (S_IRWXUGO
& ~hsb
->s_dir_umask
);
325 inode
->i_ctime
= inode
->i_atime
= inode
->i_mtime
=
326 hfs_m_to_utime(rec
->dir
.MdDat
);
327 inode
->i_op
= &hfs_dir_inode_operations
;
328 inode
->i_fop
= &hfs_dir_operations
;
331 make_bad_inode(inode
);
339 * Given the MDB for a HFS filesystem, a 'key' and an 'entry' in
340 * the catalog B-tree and the 'type' of the desired file return the
341 * inode for that file/directory or NULL. Note that 'type' indicates
342 * whether we want the actual file or directory, or the corresponding
343 * metadata (AppleDouble header file or CAP metadata file).
345 struct inode
*hfs_iget(struct super_block
*sb
, struct hfs_cat_key
*key
, hfs_cat_rec
*rec
)
347 struct hfs_iget_data data
= { key
, rec
};
353 cnid
= be32_to_cpu(rec
->dir
.DirID
);
356 cnid
= be32_to_cpu(rec
->file
.FlNum
);
361 inode
= iget5_locked(sb
, cnid
, hfs_test_inode
, hfs_read_inode
, &data
);
362 if (inode
&& (inode
->i_state
& I_NEW
))
363 unlock_new_inode(inode
);
367 void hfs_inode_write_fork(struct inode
*inode
, struct hfs_extent
*ext
,
368 __be32
*log_size
, __be32
*phys_size
)
370 memcpy(ext
, HFS_I(inode
)->first_extents
, sizeof(hfs_extent_rec
));
373 *log_size
= cpu_to_be32(inode
->i_size
);
375 *phys_size
= cpu_to_be32(HFS_I(inode
)->alloc_blocks
*
376 HFS_SB(inode
->i_sb
)->alloc_blksz
);
379 int hfs_write_inode(struct inode
*inode
, int unused
)
381 struct inode
*main_inode
= inode
;
382 struct hfs_find_data fd
;
385 dprint(DBG_INODE
, "hfs_write_inode: %lu\n", inode
->i_ino
);
386 hfs_ext_write_extent(inode
);
388 if (inode
->i_ino
< HFS_FIRSTUSER_CNID
) {
389 switch (inode
->i_ino
) {
393 hfs_btree_write(HFS_SB(inode
->i_sb
)->ext_tree
);
396 hfs_btree_write(HFS_SB(inode
->i_sb
)->cat_tree
);
404 if (HFS_IS_RSRC(inode
))
405 main_inode
= HFS_I(inode
)->rsrc_inode
;
407 if (!main_inode
->i_nlink
)
410 if (hfs_find_init(HFS_SB(main_inode
->i_sb
)->cat_tree
, &fd
))
414 fd
.search_key
->cat
= HFS_I(main_inode
)->cat_key
;
415 if (hfs_brec_find(&fd
))
419 if (S_ISDIR(main_inode
->i_mode
)) {
420 if (fd
.entrylength
< sizeof(struct hfs_cat_dir
))
422 hfs_bnode_read(fd
.bnode
, &rec
, fd
.entryoffset
,
423 sizeof(struct hfs_cat_dir
));
424 if (rec
.type
!= HFS_CDR_DIR
||
425 be32_to_cpu(rec
.dir
.DirID
) != inode
->i_ino
) {
428 rec
.dir
.MdDat
= hfs_u_to_mtime(inode
->i_mtime
);
429 rec
.dir
.Val
= cpu_to_be16(inode
->i_size
- 2);
431 hfs_bnode_write(fd
.bnode
, &rec
, fd
.entryoffset
,
432 sizeof(struct hfs_cat_dir
));
433 } else if (HFS_IS_RSRC(inode
)) {
434 hfs_bnode_read(fd
.bnode
, &rec
, fd
.entryoffset
,
435 sizeof(struct hfs_cat_file
));
436 hfs_inode_write_fork(inode
, rec
.file
.RExtRec
,
437 &rec
.file
.RLgLen
, &rec
.file
.RPyLen
);
438 hfs_bnode_write(fd
.bnode
, &rec
, fd
.entryoffset
,
439 sizeof(struct hfs_cat_file
));
441 if (fd
.entrylength
< sizeof(struct hfs_cat_file
))
443 hfs_bnode_read(fd
.bnode
, &rec
, fd
.entryoffset
,
444 sizeof(struct hfs_cat_file
));
445 if (rec
.type
!= HFS_CDR_FIL
||
446 be32_to_cpu(rec
.file
.FlNum
) != inode
->i_ino
) {
449 if (inode
->i_mode
& S_IWUSR
)
450 rec
.file
.Flags
&= ~HFS_FIL_LOCK
;
452 rec
.file
.Flags
|= HFS_FIL_LOCK
;
453 hfs_inode_write_fork(inode
, rec
.file
.ExtRec
, &rec
.file
.LgLen
, &rec
.file
.PyLen
);
454 rec
.file
.MdDat
= hfs_u_to_mtime(inode
->i_mtime
);
456 hfs_bnode_write(fd
.bnode
, &rec
, fd
.entryoffset
,
457 sizeof(struct hfs_cat_file
));
464 static struct dentry
*hfs_file_lookup(struct inode
*dir
, struct dentry
*dentry
,
465 struct nameidata
*nd
)
467 struct inode
*inode
= NULL
;
469 struct hfs_find_data fd
;
472 if (HFS_IS_RSRC(dir
) || strcmp(dentry
->d_name
.name
, "rsrc"))
475 inode
= HFS_I(dir
)->rsrc_inode
;
479 inode
= new_inode(dir
->i_sb
);
481 return ERR_PTR(-ENOMEM
);
483 hfs_find_init(HFS_SB(dir
->i_sb
)->cat_tree
, &fd
);
484 fd
.search_key
->cat
= HFS_I(dir
)->cat_key
;
485 res
= hfs_brec_read(&fd
, &rec
, sizeof(rec
));
487 struct hfs_iget_data idata
= { NULL
, &rec
};
488 hfs_read_inode(inode
, &idata
);
495 HFS_I(inode
)->rsrc_inode
= dir
;
496 HFS_I(dir
)->rsrc_inode
= inode
;
498 hlist_add_head(&inode
->i_hash
, &HFS_SB(dir
->i_sb
)->rsrc_inodes
);
499 mark_inode_dirty(inode
);
501 d_add(dentry
, inode
);
505 void hfs_clear_inode(struct inode
*inode
)
507 if (HFS_IS_RSRC(inode
) && HFS_I(inode
)->rsrc_inode
) {
508 HFS_I(HFS_I(inode
)->rsrc_inode
)->rsrc_inode
= NULL
;
509 iput(HFS_I(inode
)->rsrc_inode
);
513 static int hfs_permission(struct inode
*inode
, int mask
,
514 struct nameidata
*nd
)
516 if (S_ISREG(inode
->i_mode
) && mask
& MAY_EXEC
)
518 return generic_permission(inode
, mask
, NULL
);
521 static int hfs_file_open(struct inode
*inode
, struct file
*file
)
523 if (HFS_IS_RSRC(inode
))
524 inode
= HFS_I(inode
)->rsrc_inode
;
525 if (atomic_read(&file
->f_count
) != 1)
527 atomic_inc(&HFS_I(inode
)->opencnt
);
531 static int hfs_file_release(struct inode
*inode
, struct file
*file
)
533 //struct super_block *sb = inode->i_sb;
535 if (HFS_IS_RSRC(inode
))
536 inode
= HFS_I(inode
)->rsrc_inode
;
537 if (atomic_read(&file
->f_count
) != 0)
539 if (atomic_dec_and_test(&HFS_I(inode
)->opencnt
)) {
540 mutex_lock(&inode
->i_mutex
);
541 hfs_file_truncate(inode
);
542 //if (inode->i_flags & S_DEAD) {
543 // hfs_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL);
544 // hfs_delete_inode(inode);
546 mutex_unlock(&inode
->i_mutex
);
552 * hfs_notify_change()
554 * Based very closely on fs/msdos/inode.c by Werner Almesberger
556 * This is the notify_change() field in the super_operations structure
557 * for HFS file systems. The purpose is to take that changes made to
558 * an inode and apply then in a filesystem-dependent manner. In this
559 * case the process has a few of tasks to do:
560 * 1) prevent changes to the i_uid and i_gid fields.
561 * 2) map file permissions to the closest allowable permissions
562 * 3) Since multiple Linux files can share the same on-disk inode under
563 * HFS (for instance the data and resource forks of a file) a change
564 * to permissions must be applied to all other in-core inodes which
565 * correspond to the same HFS file.
568 int hfs_inode_setattr(struct dentry
*dentry
, struct iattr
* attr
)
570 struct inode
*inode
= dentry
->d_inode
;
571 struct hfs_sb_info
*hsb
= HFS_SB(inode
->i_sb
);
574 error
= inode_change_ok(inode
, attr
); /* basic permission checks */
578 /* no uig/gid changes and limit which mode bits can be set */
579 if (((attr
->ia_valid
& ATTR_UID
) &&
580 (attr
->ia_uid
!= hsb
->s_uid
)) ||
581 ((attr
->ia_valid
& ATTR_GID
) &&
582 (attr
->ia_gid
!= hsb
->s_gid
)) ||
583 ((attr
->ia_valid
& ATTR_MODE
) &&
584 ((S_ISDIR(inode
->i_mode
) &&
585 (attr
->ia_mode
!= inode
->i_mode
)) ||
586 (attr
->ia_mode
& ~HFS_VALID_MODE_BITS
)))) {
587 return hsb
->s_quiet
? 0 : error
;
590 if (attr
->ia_valid
& ATTR_MODE
) {
591 /* Only the 'w' bits can ever change and only all together. */
592 if (attr
->ia_mode
& S_IWUSR
)
593 attr
->ia_mode
= inode
->i_mode
| S_IWUGO
;
595 attr
->ia_mode
= inode
->i_mode
& ~S_IWUGO
;
596 attr
->ia_mode
&= S_ISDIR(inode
->i_mode
) ? ~hsb
->s_dir_umask
: ~hsb
->s_file_umask
;
598 error
= inode_setattr(inode
, attr
);
606 static const struct file_operations hfs_file_operations
= {
607 .llseek
= generic_file_llseek
,
608 .read
= do_sync_read
,
609 .aio_read
= generic_file_aio_read
,
610 .write
= do_sync_write
,
611 .aio_write
= generic_file_aio_write
,
612 .mmap
= generic_file_mmap
,
613 .sendfile
= generic_file_sendfile
,
615 .open
= hfs_file_open
,
616 .release
= hfs_file_release
,
619 static struct inode_operations hfs_file_inode_operations
= {
620 .lookup
= hfs_file_lookup
,
621 .truncate
= hfs_file_truncate
,
622 .setattr
= hfs_inode_setattr
,
623 .permission
= hfs_permission
,
624 .setxattr
= hfs_setxattr
,
625 .getxattr
= hfs_getxattr
,
626 .listxattr
= hfs_listxattr
,