2 * linux/fs/hfsplus/super.c
5 * Brad Boyer (flar@allandria.com)
6 * (C) 2003 Ardis Technologies <roman@ardistech.com>
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/pagemap.h>
14 #include <linux/slab.h>
15 #include <linux/smp_lock.h>
16 #include <linux/vfs.h>
17 #include <linux/nls.h>
19 static struct inode
*hfsplus_alloc_inode(struct super_block
*sb
);
20 static void hfsplus_destroy_inode(struct inode
*inode
);
22 #include "hfsplus_fs.h"
24 struct inode
*hfsplus_iget(struct super_block
*sb
, unsigned long ino
)
26 struct hfs_find_data fd
;
27 struct hfsplus_vh
*vhdr
;
31 inode
= iget_locked(sb
, ino
);
33 return ERR_PTR(-ENOMEM
);
34 if (!(inode
->i_state
& I_NEW
))
37 INIT_LIST_HEAD(&HFSPLUS_I(inode
).open_dir_list
);
38 mutex_init(&HFSPLUS_I(inode
).extents_lock
);
39 HFSPLUS_I(inode
).flags
= 0;
40 HFSPLUS_I(inode
).rsrc_inode
= NULL
;
41 atomic_set(&HFSPLUS_I(inode
).opencnt
, 0);
43 if (inode
->i_ino
>= HFSPLUS_FIRSTUSER_CNID
) {
45 hfs_find_init(HFSPLUS_SB(inode
->i_sb
).cat_tree
, &fd
);
46 err
= hfsplus_find_cat(inode
->i_sb
, inode
->i_ino
, &fd
);
48 err
= hfsplus_cat_read_inode(inode
, &fd
);
54 vhdr
= HFSPLUS_SB(inode
->i_sb
).s_vhdr
;
55 switch(inode
->i_ino
) {
56 case HFSPLUS_ROOT_CNID
:
58 case HFSPLUS_EXT_CNID
:
59 hfsplus_inode_read_fork(inode
, &vhdr
->ext_file
);
60 inode
->i_mapping
->a_ops
= &hfsplus_btree_aops
;
62 case HFSPLUS_CAT_CNID
:
63 hfsplus_inode_read_fork(inode
, &vhdr
->cat_file
);
64 inode
->i_mapping
->a_ops
= &hfsplus_btree_aops
;
66 case HFSPLUS_ALLOC_CNID
:
67 hfsplus_inode_read_fork(inode
, &vhdr
->alloc_file
);
68 inode
->i_mapping
->a_ops
= &hfsplus_aops
;
70 case HFSPLUS_START_CNID
:
71 hfsplus_inode_read_fork(inode
, &vhdr
->start_file
);
73 case HFSPLUS_ATTR_CNID
:
74 hfsplus_inode_read_fork(inode
, &vhdr
->attr_file
);
75 inode
->i_mapping
->a_ops
= &hfsplus_btree_aops
;
82 unlock_new_inode(inode
);
90 static int hfsplus_write_inode(struct inode
*inode
,
91 struct writeback_control
*wbc
)
93 struct hfsplus_vh
*vhdr
;
96 dprint(DBG_INODE
, "hfsplus_write_inode: %lu\n", inode
->i_ino
);
97 hfsplus_ext_write_extent(inode
);
98 if (inode
->i_ino
>= HFSPLUS_FIRSTUSER_CNID
) {
99 return hfsplus_cat_write_inode(inode
);
101 vhdr
= HFSPLUS_SB(inode
->i_sb
).s_vhdr
;
102 switch (inode
->i_ino
) {
103 case HFSPLUS_ROOT_CNID
:
104 ret
= hfsplus_cat_write_inode(inode
);
106 case HFSPLUS_EXT_CNID
:
107 if (vhdr
->ext_file
.total_size
!= cpu_to_be64(inode
->i_size
)) {
108 HFSPLUS_SB(inode
->i_sb
).flags
|= HFSPLUS_SB_WRITEBACKUP
;
109 inode
->i_sb
->s_dirt
= 1;
111 hfsplus_inode_write_fork(inode
, &vhdr
->ext_file
);
112 hfs_btree_write(HFSPLUS_SB(inode
->i_sb
).ext_tree
);
114 case HFSPLUS_CAT_CNID
:
115 if (vhdr
->cat_file
.total_size
!= cpu_to_be64(inode
->i_size
)) {
116 HFSPLUS_SB(inode
->i_sb
).flags
|= HFSPLUS_SB_WRITEBACKUP
;
117 inode
->i_sb
->s_dirt
= 1;
119 hfsplus_inode_write_fork(inode
, &vhdr
->cat_file
);
120 hfs_btree_write(HFSPLUS_SB(inode
->i_sb
).cat_tree
);
122 case HFSPLUS_ALLOC_CNID
:
123 if (vhdr
->alloc_file
.total_size
!= cpu_to_be64(inode
->i_size
)) {
124 HFSPLUS_SB(inode
->i_sb
).flags
|= HFSPLUS_SB_WRITEBACKUP
;
125 inode
->i_sb
->s_dirt
= 1;
127 hfsplus_inode_write_fork(inode
, &vhdr
->alloc_file
);
129 case HFSPLUS_START_CNID
:
130 if (vhdr
->start_file
.total_size
!= cpu_to_be64(inode
->i_size
)) {
131 HFSPLUS_SB(inode
->i_sb
).flags
|= HFSPLUS_SB_WRITEBACKUP
;
132 inode
->i_sb
->s_dirt
= 1;
134 hfsplus_inode_write_fork(inode
, &vhdr
->start_file
);
136 case HFSPLUS_ATTR_CNID
:
137 if (vhdr
->attr_file
.total_size
!= cpu_to_be64(inode
->i_size
)) {
138 HFSPLUS_SB(inode
->i_sb
).flags
|= HFSPLUS_SB_WRITEBACKUP
;
139 inode
->i_sb
->s_dirt
= 1;
141 hfsplus_inode_write_fork(inode
, &vhdr
->attr_file
);
142 hfs_btree_write(HFSPLUS_SB(inode
->i_sb
).attr_tree
);
148 static void hfsplus_evict_inode(struct inode
*inode
)
150 dprint(DBG_INODE
, "hfsplus_evict_inode: %lu\n", inode
->i_ino
);
151 truncate_inode_pages(&inode
->i_data
, 0);
152 end_writeback(inode
);
153 if (HFSPLUS_IS_RSRC(inode
)) {
154 HFSPLUS_I(HFSPLUS_I(inode
).rsrc_inode
).rsrc_inode
= NULL
;
155 iput(HFSPLUS_I(inode
).rsrc_inode
);
159 int hfsplus_sync_fs(struct super_block
*sb
, int wait
)
161 struct hfsplus_vh
*vhdr
= HFSPLUS_SB(sb
).s_vhdr
;
163 dprint(DBG_SUPER
, "hfsplus_write_super\n");
168 vhdr
->free_blocks
= cpu_to_be32(HFSPLUS_SB(sb
).free_blocks
);
169 vhdr
->next_alloc
= cpu_to_be32(HFSPLUS_SB(sb
).next_alloc
);
170 vhdr
->next_cnid
= cpu_to_be32(HFSPLUS_SB(sb
).next_cnid
);
171 vhdr
->folder_count
= cpu_to_be32(HFSPLUS_SB(sb
).folder_count
);
172 vhdr
->file_count
= cpu_to_be32(HFSPLUS_SB(sb
).file_count
);
174 mark_buffer_dirty(HFSPLUS_SB(sb
).s_vhbh
);
175 if (HFSPLUS_SB(sb
).flags
& HFSPLUS_SB_WRITEBACKUP
) {
176 if (HFSPLUS_SB(sb
).sect_count
) {
177 struct buffer_head
*bh
;
180 block
= HFSPLUS_SB(sb
).blockoffset
;
181 block
+= (HFSPLUS_SB(sb
).sect_count
- 2) >> (sb
->s_blocksize_bits
- 9);
182 offset
= ((HFSPLUS_SB(sb
).sect_count
- 2) << 9) & (sb
->s_blocksize
- 1);
183 printk(KERN_DEBUG
"hfs: backup: %u,%u,%u,%u\n", HFSPLUS_SB(sb
).blockoffset
,
184 HFSPLUS_SB(sb
).sect_count
, block
, offset
);
185 bh
= sb_bread(sb
, block
);
187 vhdr
= (struct hfsplus_vh
*)(bh
->b_data
+ offset
);
188 if (be16_to_cpu(vhdr
->signature
) == HFSPLUS_VOLHEAD_SIG
) {
189 memcpy(vhdr
, HFSPLUS_SB(sb
).s_vhdr
, sizeof(*vhdr
));
190 mark_buffer_dirty(bh
);
193 printk(KERN_WARNING
"hfs: backup not found!\n");
196 HFSPLUS_SB(sb
).flags
&= ~HFSPLUS_SB_WRITEBACKUP
;
202 static void hfsplus_write_super(struct super_block
*sb
)
204 if (!(sb
->s_flags
& MS_RDONLY
))
205 hfsplus_sync_fs(sb
, 1);
210 static void hfsplus_put_super(struct super_block
*sb
)
212 dprint(DBG_SUPER
, "hfsplus_put_super\n");
219 hfsplus_write_super(sb
);
220 if (!(sb
->s_flags
& MS_RDONLY
) && HFSPLUS_SB(sb
).s_vhdr
) {
221 struct hfsplus_vh
*vhdr
= HFSPLUS_SB(sb
).s_vhdr
;
223 vhdr
->modify_date
= hfsp_now2mt();
224 vhdr
->attributes
|= cpu_to_be32(HFSPLUS_VOL_UNMNT
);
225 vhdr
->attributes
&= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT
);
226 mark_buffer_dirty(HFSPLUS_SB(sb
).s_vhbh
);
227 sync_dirty_buffer(HFSPLUS_SB(sb
).s_vhbh
);
230 hfs_btree_close(HFSPLUS_SB(sb
).cat_tree
);
231 hfs_btree_close(HFSPLUS_SB(sb
).ext_tree
);
232 iput(HFSPLUS_SB(sb
).alloc_file
);
233 iput(HFSPLUS_SB(sb
).hidden_dir
);
234 brelse(HFSPLUS_SB(sb
).s_vhbh
);
235 unload_nls(HFSPLUS_SB(sb
).nls
);
236 kfree(sb
->s_fs_info
);
237 sb
->s_fs_info
= NULL
;
242 static int hfsplus_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
244 struct super_block
*sb
= dentry
->d_sb
;
245 u64 id
= huge_encode_dev(sb
->s_bdev
->bd_dev
);
247 buf
->f_type
= HFSPLUS_SUPER_MAGIC
;
248 buf
->f_bsize
= sb
->s_blocksize
;
249 buf
->f_blocks
= HFSPLUS_SB(sb
).total_blocks
<< HFSPLUS_SB(sb
).fs_shift
;
250 buf
->f_bfree
= HFSPLUS_SB(sb
).free_blocks
<< HFSPLUS_SB(sb
).fs_shift
;
251 buf
->f_bavail
= buf
->f_bfree
;
252 buf
->f_files
= 0xFFFFFFFF;
253 buf
->f_ffree
= 0xFFFFFFFF - HFSPLUS_SB(sb
).next_cnid
;
254 buf
->f_fsid
.val
[0] = (u32
)id
;
255 buf
->f_fsid
.val
[1] = (u32
)(id
>> 32);
256 buf
->f_namelen
= HFSPLUS_MAX_STRLEN
;
261 static int hfsplus_remount(struct super_block
*sb
, int *flags
, char *data
)
263 if ((*flags
& MS_RDONLY
) == (sb
->s_flags
& MS_RDONLY
))
265 if (!(*flags
& MS_RDONLY
)) {
266 struct hfsplus_vh
*vhdr
= HFSPLUS_SB(sb
).s_vhdr
;
267 struct hfsplus_sb_info sbi
;
269 memset(&sbi
, 0, sizeof(struct hfsplus_sb_info
));
270 sbi
.nls
= HFSPLUS_SB(sb
).nls
;
271 if (!hfsplus_parse_options(data
, &sbi
))
274 if (!(vhdr
->attributes
& cpu_to_be32(HFSPLUS_VOL_UNMNT
))) {
275 printk(KERN_WARNING
"hfs: filesystem was not cleanly unmounted, "
276 "running fsck.hfsplus is recommended. leaving read-only.\n");
277 sb
->s_flags
|= MS_RDONLY
;
279 } else if (sbi
.flags
& HFSPLUS_SB_FORCE
) {
281 } else if (vhdr
->attributes
& cpu_to_be32(HFSPLUS_VOL_SOFTLOCK
)) {
282 printk(KERN_WARNING
"hfs: filesystem is marked locked, leaving read-only.\n");
283 sb
->s_flags
|= MS_RDONLY
;
285 } else if (vhdr
->attributes
& cpu_to_be32(HFSPLUS_VOL_JOURNALED
)) {
286 printk(KERN_WARNING
"hfs: filesystem is marked journaled, leaving read-only.\n");
287 sb
->s_flags
|= MS_RDONLY
;
294 static const struct super_operations hfsplus_sops
= {
295 .alloc_inode
= hfsplus_alloc_inode
,
296 .destroy_inode
= hfsplus_destroy_inode
,
297 .write_inode
= hfsplus_write_inode
,
298 .evict_inode
= hfsplus_evict_inode
,
299 .put_super
= hfsplus_put_super
,
300 .write_super
= hfsplus_write_super
,
301 .sync_fs
= hfsplus_sync_fs
,
302 .statfs
= hfsplus_statfs
,
303 .remount_fs
= hfsplus_remount
,
304 .show_options
= hfsplus_show_options
,
307 static int hfsplus_fill_super(struct super_block
*sb
, void *data
, int silent
)
309 struct hfsplus_vh
*vhdr
;
310 struct hfsplus_sb_info
*sbi
;
311 hfsplus_cat_entry entry
;
312 struct hfs_find_data fd
;
313 struct inode
*root
, *inode
;
315 struct nls_table
*nls
= NULL
;
318 sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
323 INIT_HLIST_HEAD(&sbi
->rsrc_inodes
);
324 hfsplus_fill_defaults(sbi
);
325 if (!hfsplus_parse_options(data
, sbi
)) {
326 printk(KERN_ERR
"hfs: unable to parse mount options\n");
331 /* temporarily use utf8 to correctly find the hidden dir below */
333 sbi
->nls
= load_nls("utf8");
335 printk(KERN_ERR
"hfs: unable to load nls for utf8\n");
340 /* Grab the volume header */
341 if (hfsplus_read_wrapper(sb
)) {
343 printk(KERN_WARNING
"hfs: unable to find HFS+ superblock\n");
347 vhdr
= HFSPLUS_SB(sb
).s_vhdr
;
349 /* Copy parts of the volume header into the superblock */
350 sb
->s_magic
= HFSPLUS_VOLHEAD_SIG
;
351 if (be16_to_cpu(vhdr
->version
) < HFSPLUS_MIN_VERSION
||
352 be16_to_cpu(vhdr
->version
) > HFSPLUS_CURRENT_VERSION
) {
353 printk(KERN_ERR
"hfs: wrong filesystem version\n");
356 HFSPLUS_SB(sb
).total_blocks
= be32_to_cpu(vhdr
->total_blocks
);
357 HFSPLUS_SB(sb
).free_blocks
= be32_to_cpu(vhdr
->free_blocks
);
358 HFSPLUS_SB(sb
).next_alloc
= be32_to_cpu(vhdr
->next_alloc
);
359 HFSPLUS_SB(sb
).next_cnid
= be32_to_cpu(vhdr
->next_cnid
);
360 HFSPLUS_SB(sb
).file_count
= be32_to_cpu(vhdr
->file_count
);
361 HFSPLUS_SB(sb
).folder_count
= be32_to_cpu(vhdr
->folder_count
);
362 HFSPLUS_SB(sb
).data_clump_blocks
= be32_to_cpu(vhdr
->data_clump_sz
) >> HFSPLUS_SB(sb
).alloc_blksz_shift
;
363 if (!HFSPLUS_SB(sb
).data_clump_blocks
)
364 HFSPLUS_SB(sb
).data_clump_blocks
= 1;
365 HFSPLUS_SB(sb
).rsrc_clump_blocks
= be32_to_cpu(vhdr
->rsrc_clump_sz
) >> HFSPLUS_SB(sb
).alloc_blksz_shift
;
366 if (!HFSPLUS_SB(sb
).rsrc_clump_blocks
)
367 HFSPLUS_SB(sb
).rsrc_clump_blocks
= 1;
369 /* Set up operations so we can load metadata */
370 sb
->s_op
= &hfsplus_sops
;
371 sb
->s_maxbytes
= MAX_LFS_FILESIZE
;
373 if (!(vhdr
->attributes
& cpu_to_be32(HFSPLUS_VOL_UNMNT
))) {
374 printk(KERN_WARNING
"hfs: Filesystem was not cleanly unmounted, "
375 "running fsck.hfsplus is recommended. mounting read-only.\n");
376 sb
->s_flags
|= MS_RDONLY
;
377 } else if (sbi
->flags
& HFSPLUS_SB_FORCE
) {
379 } else if (vhdr
->attributes
& cpu_to_be32(HFSPLUS_VOL_SOFTLOCK
)) {
380 printk(KERN_WARNING
"hfs: Filesystem is marked locked, mounting read-only.\n");
381 sb
->s_flags
|= MS_RDONLY
;
382 } else if ((vhdr
->attributes
& cpu_to_be32(HFSPLUS_VOL_JOURNALED
)) && !(sb
->s_flags
& MS_RDONLY
)) {
383 printk(KERN_WARNING
"hfs: write access to a journaled filesystem is not supported, "
384 "use the force option at your own risk, mounting read-only.\n");
385 sb
->s_flags
|= MS_RDONLY
;
387 sbi
->flags
&= ~HFSPLUS_SB_FORCE
;
389 /* Load metadata objects (B*Trees) */
390 HFSPLUS_SB(sb
).ext_tree
= hfs_btree_open(sb
, HFSPLUS_EXT_CNID
);
391 if (!HFSPLUS_SB(sb
).ext_tree
) {
392 printk(KERN_ERR
"hfs: failed to load extents file\n");
395 HFSPLUS_SB(sb
).cat_tree
= hfs_btree_open(sb
, HFSPLUS_CAT_CNID
);
396 if (!HFSPLUS_SB(sb
).cat_tree
) {
397 printk(KERN_ERR
"hfs: failed to load catalog file\n");
401 inode
= hfsplus_iget(sb
, HFSPLUS_ALLOC_CNID
);
403 printk(KERN_ERR
"hfs: failed to load allocation file\n");
404 err
= PTR_ERR(inode
);
407 HFSPLUS_SB(sb
).alloc_file
= inode
;
409 /* Load the root directory */
410 root
= hfsplus_iget(sb
, HFSPLUS_ROOT_CNID
);
412 printk(KERN_ERR
"hfs: failed to load root directory\n");
416 sb
->s_root
= d_alloc_root(root
);
422 sb
->s_root
->d_op
= &hfsplus_dentry_operations
;
424 str
.len
= sizeof(HFSP_HIDDENDIR_NAME
) - 1;
425 str
.name
= HFSP_HIDDENDIR_NAME
;
426 hfs_find_init(HFSPLUS_SB(sb
).cat_tree
, &fd
);
427 hfsplus_cat_build_key(sb
, fd
.search_key
, HFSPLUS_ROOT_CNID
, &str
);
428 if (!hfs_brec_read(&fd
, &entry
, sizeof(entry
))) {
430 if (entry
.type
!= cpu_to_be16(HFSPLUS_FOLDER
))
432 inode
= hfsplus_iget(sb
, be32_to_cpu(entry
.folder
.id
));
434 err
= PTR_ERR(inode
);
437 HFSPLUS_SB(sb
).hidden_dir
= inode
;
441 if (sb
->s_flags
& MS_RDONLY
)
444 /* H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
445 * all three are registered with Apple for our use
447 vhdr
->last_mount_vers
= cpu_to_be32(HFSP_MOUNT_VERSION
);
448 vhdr
->modify_date
= hfsp_now2mt();
449 be32_add_cpu(&vhdr
->write_count
, 1);
450 vhdr
->attributes
&= cpu_to_be32(~HFSPLUS_VOL_UNMNT
);
451 vhdr
->attributes
|= cpu_to_be32(HFSPLUS_VOL_INCNSTNT
);
452 mark_buffer_dirty(HFSPLUS_SB(sb
).s_vhbh
);
453 sync_dirty_buffer(HFSPLUS_SB(sb
).s_vhbh
);
455 if (!HFSPLUS_SB(sb
).hidden_dir
) {
456 printk(KERN_DEBUG
"hfs: create hidden dir...\n");
457 HFSPLUS_SB(sb
).hidden_dir
= hfsplus_new_inode(sb
, S_IFDIR
);
458 hfsplus_create_cat(HFSPLUS_SB(sb
).hidden_dir
->i_ino
, sb
->s_root
->d_inode
,
459 &str
, HFSPLUS_SB(sb
).hidden_dir
);
460 mark_inode_dirty(HFSPLUS_SB(sb
).hidden_dir
);
463 unload_nls(sbi
->nls
);
468 hfsplus_put_super(sb
);
473 MODULE_AUTHOR("Brad Boyer");
474 MODULE_DESCRIPTION("Extended Macintosh Filesystem");
475 MODULE_LICENSE("GPL");
477 static struct kmem_cache
*hfsplus_inode_cachep
;
479 static struct inode
*hfsplus_alloc_inode(struct super_block
*sb
)
481 struct hfsplus_inode_info
*i
;
483 i
= kmem_cache_alloc(hfsplus_inode_cachep
, GFP_KERNEL
);
484 return i
? &i
->vfs_inode
: NULL
;
487 static void hfsplus_destroy_inode(struct inode
*inode
)
489 kmem_cache_free(hfsplus_inode_cachep
, &HFSPLUS_I(inode
));
492 #define HFSPLUS_INODE_SIZE sizeof(struct hfsplus_inode_info)
494 static int hfsplus_get_sb(struct file_system_type
*fs_type
,
495 int flags
, const char *dev_name
, void *data
,
496 struct vfsmount
*mnt
)
498 return get_sb_bdev(fs_type
, flags
, dev_name
, data
, hfsplus_fill_super
,
502 static struct file_system_type hfsplus_fs_type
= {
503 .owner
= THIS_MODULE
,
505 .get_sb
= hfsplus_get_sb
,
506 .kill_sb
= kill_block_super
,
507 .fs_flags
= FS_REQUIRES_DEV
,
510 static void hfsplus_init_once(void *p
)
512 struct hfsplus_inode_info
*i
= p
;
514 inode_init_once(&i
->vfs_inode
);
517 static int __init
init_hfsplus_fs(void)
521 hfsplus_inode_cachep
= kmem_cache_create("hfsplus_icache",
522 HFSPLUS_INODE_SIZE
, 0, SLAB_HWCACHE_ALIGN
,
524 if (!hfsplus_inode_cachep
)
526 err
= register_filesystem(&hfsplus_fs_type
);
528 kmem_cache_destroy(hfsplus_inode_cachep
);
532 static void __exit
exit_hfsplus_fs(void)
534 unregister_filesystem(&hfsplus_fs_type
);
535 kmem_cache_destroy(hfsplus_inode_cachep
);
538 module_init(init_hfsplus_fs
)
539 module_exit(exit_hfsplus_fs
)