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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/hfs/super.c | |
3 | * | |
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. | |
7 | * | |
8 | * This file contains hfs_read_super(), some of the super_ops and | |
14b30d62 | 9 | * init_hfs_fs() and exit_hfs_fs(). The remaining super_ops are in |
1da177e4 LT |
10 | * inode.c since they deal with inodes. |
11 | * | |
12 | * Based on the minix file system code, (C) 1991, 1992 by Linus Torvalds | |
13 | */ | |
14 | ||
1da177e4 LT |
15 | #include <linux/module.h> |
16 | #include <linux/blkdev.h> | |
717dd80e | 17 | #include <linux/mount.h> |
1da177e4 | 18 | #include <linux/init.h> |
328b9227 | 19 | #include <linux/nls.h> |
1da177e4 | 20 | #include <linux/parser.h> |
717dd80e | 21 | #include <linux/seq_file.h> |
5a0e3ad6 | 22 | #include <linux/slab.h> |
405f5571 | 23 | #include <linux/smp_lock.h> |
1da177e4 LT |
24 | #include <linux/vfs.h> |
25 | ||
26 | #include "hfs_fs.h" | |
27 | #include "btree.h" | |
28 | ||
e18b890b | 29 | static struct kmem_cache *hfs_inode_cachep; |
1da177e4 LT |
30 | |
31 | MODULE_LICENSE("GPL"); | |
32 | ||
33 | /* | |
34 | * hfs_write_super() | |
35 | * | |
36 | * Description: | |
37 | * This function is called by the VFS only. When the filesystem | |
38 | * is mounted r/w it updates the MDB on disk. | |
39 | * Input Variable(s): | |
40 | * struct super_block *sb: Pointer to the hfs superblock | |
41 | * Output Variable(s): | |
42 | * NONE | |
43 | * Returns: | |
44 | * void | |
45 | * Preconditions: | |
46 | * 'sb' points to a "valid" (struct super_block). | |
47 | * Postconditions: | |
48 | * The MDB is marked 'unsuccessfully unmounted' by clearing bit 8 of drAtrb | |
49 | * (hfs_put_super() must set this flag!). Some MDB fields are updated | |
50 | * and the MDB buffer is written to disk by calling hfs_mdb_commit(). | |
51 | */ | |
52 | static void hfs_write_super(struct super_block *sb) | |
53 | { | |
ebc1ac16 | 54 | lock_super(sb); |
1da177e4 | 55 | sb->s_dirt = 0; |
ebc1ac16 | 56 | |
1da177e4 | 57 | /* sync everything to the buffers */ |
ebc1ac16 CH |
58 | if (!(sb->s_flags & MS_RDONLY)) |
59 | hfs_mdb_commit(sb); | |
60 | unlock_super(sb); | |
1da177e4 LT |
61 | } |
62 | ||
58bc5bbb CH |
63 | static int hfs_sync_fs(struct super_block *sb, int wait) |
64 | { | |
65 | lock_super(sb); | |
66 | hfs_mdb_commit(sb); | |
67 | sb->s_dirt = 0; | |
68 | unlock_super(sb); | |
69 | ||
70 | return 0; | |
71 | } | |
72 | ||
1da177e4 LT |
73 | /* |
74 | * hfs_put_super() | |
75 | * | |
76 | * This is the put_super() entry in the super_operations structure for | |
77 | * HFS filesystems. The purpose is to release the resources | |
78 | * associated with the superblock sb. | |
79 | */ | |
80 | static void hfs_put_super(struct super_block *sb) | |
81 | { | |
6cfd0148 CH |
82 | lock_kernel(); |
83 | ||
8c85e125 CH |
84 | if (sb->s_dirt) |
85 | hfs_write_super(sb); | |
1da177e4 LT |
86 | hfs_mdb_close(sb); |
87 | /* release the MDB's resources */ | |
88 | hfs_mdb_put(sb); | |
6cfd0148 CH |
89 | |
90 | unlock_kernel(); | |
1da177e4 LT |
91 | } |
92 | ||
93 | /* | |
94 | * hfs_statfs() | |
95 | * | |
96 | * This is the statfs() entry in the super_operations structure for | |
97 | * HFS filesystems. The purpose is to return various data about the | |
98 | * filesystem. | |
99 | * | |
100 | * changed f_files/f_ffree to reflect the fs_ablock/free_ablocks. | |
101 | */ | |
726c3342 | 102 | static int hfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 103 | { |
726c3342 | 104 | struct super_block *sb = dentry->d_sb; |
7dd2c000 | 105 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
726c3342 | 106 | |
1da177e4 LT |
107 | buf->f_type = HFS_SUPER_MAGIC; |
108 | buf->f_bsize = sb->s_blocksize; | |
109 | buf->f_blocks = (u32)HFS_SB(sb)->fs_ablocks * HFS_SB(sb)->fs_div; | |
110 | buf->f_bfree = (u32)HFS_SB(sb)->free_ablocks * HFS_SB(sb)->fs_div; | |
111 | buf->f_bavail = buf->f_bfree; | |
112 | buf->f_files = HFS_SB(sb)->fs_ablocks; | |
113 | buf->f_ffree = HFS_SB(sb)->free_ablocks; | |
7dd2c000 CL |
114 | buf->f_fsid.val[0] = (u32)id; |
115 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
1da177e4 LT |
116 | buf->f_namelen = HFS_NAMELEN; |
117 | ||
118 | return 0; | |
119 | } | |
120 | ||
121 | static int hfs_remount(struct super_block *sb, int *flags, char *data) | |
122 | { | |
123 | *flags |= MS_NODIRATIME; | |
124 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) | |
125 | return 0; | |
126 | if (!(*flags & MS_RDONLY)) { | |
127 | if (!(HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_UNMNT))) { | |
7cf3cc30 | 128 | printk(KERN_WARNING "hfs: filesystem was not cleanly unmounted, " |
1da177e4 LT |
129 | "running fsck.hfs is recommended. leaving read-only.\n"); |
130 | sb->s_flags |= MS_RDONLY; | |
131 | *flags |= MS_RDONLY; | |
132 | } else if (HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_SLOCK)) { | |
7cf3cc30 | 133 | printk(KERN_WARNING "hfs: filesystem is marked locked, leaving read-only.\n"); |
1da177e4 LT |
134 | sb->s_flags |= MS_RDONLY; |
135 | *flags |= MS_RDONLY; | |
136 | } | |
137 | } | |
138 | return 0; | |
139 | } | |
140 | ||
717dd80e RZ |
141 | static int hfs_show_options(struct seq_file *seq, struct vfsmount *mnt) |
142 | { | |
143 | struct hfs_sb_info *sbi = HFS_SB(mnt->mnt_sb); | |
144 | ||
145 | if (sbi->s_creator != cpu_to_be32(0x3f3f3f3f)) | |
146 | seq_printf(seq, ",creator=%.4s", (char *)&sbi->s_creator); | |
147 | if (sbi->s_type != cpu_to_be32(0x3f3f3f3f)) | |
148 | seq_printf(seq, ",type=%.4s", (char *)&sbi->s_type); | |
149 | seq_printf(seq, ",uid=%u,gid=%u", sbi->s_uid, sbi->s_gid); | |
150 | if (sbi->s_file_umask != 0133) | |
151 | seq_printf(seq, ",file_umask=%o", sbi->s_file_umask); | |
152 | if (sbi->s_dir_umask != 0022) | |
153 | seq_printf(seq, ",dir_umask=%o", sbi->s_dir_umask); | |
154 | if (sbi->part >= 0) | |
155 | seq_printf(seq, ",part=%u", sbi->part); | |
156 | if (sbi->session >= 0) | |
157 | seq_printf(seq, ",session=%u", sbi->session); | |
328b9227 RZ |
158 | if (sbi->nls_disk) |
159 | seq_printf(seq, ",codepage=%s", sbi->nls_disk->charset); | |
160 | if (sbi->nls_io) | |
161 | seq_printf(seq, ",iocharset=%s", sbi->nls_io->charset); | |
717dd80e RZ |
162 | if (sbi->s_quiet) |
163 | seq_printf(seq, ",quiet"); | |
164 | return 0; | |
165 | } | |
166 | ||
1da177e4 LT |
167 | static struct inode *hfs_alloc_inode(struct super_block *sb) |
168 | { | |
169 | struct hfs_inode_info *i; | |
170 | ||
e94b1766 | 171 | i = kmem_cache_alloc(hfs_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
172 | return i ? &i->vfs_inode : NULL; |
173 | } | |
174 | ||
175 | static void hfs_destroy_inode(struct inode *inode) | |
176 | { | |
177 | kmem_cache_free(hfs_inode_cachep, HFS_I(inode)); | |
178 | } | |
179 | ||
ee9b6d61 | 180 | static const struct super_operations hfs_super_operations = { |
1da177e4 LT |
181 | .alloc_inode = hfs_alloc_inode, |
182 | .destroy_inode = hfs_destroy_inode, | |
183 | .write_inode = hfs_write_inode, | |
b57922d9 | 184 | .evict_inode = hfs_evict_inode, |
1da177e4 LT |
185 | .put_super = hfs_put_super, |
186 | .write_super = hfs_write_super, | |
58bc5bbb | 187 | .sync_fs = hfs_sync_fs, |
1da177e4 LT |
188 | .statfs = hfs_statfs, |
189 | .remount_fs = hfs_remount, | |
717dd80e | 190 | .show_options = hfs_show_options, |
1da177e4 LT |
191 | }; |
192 | ||
193 | enum { | |
194 | opt_uid, opt_gid, opt_umask, opt_file_umask, opt_dir_umask, | |
195 | opt_part, opt_session, opt_type, opt_creator, opt_quiet, | |
328b9227 | 196 | opt_codepage, opt_iocharset, |
1da177e4 LT |
197 | opt_err |
198 | }; | |
199 | ||
a447c093 | 200 | static const match_table_t tokens = { |
1da177e4 LT |
201 | { opt_uid, "uid=%u" }, |
202 | { opt_gid, "gid=%u" }, | |
203 | { opt_umask, "umask=%o" }, | |
204 | { opt_file_umask, "file_umask=%o" }, | |
205 | { opt_dir_umask, "dir_umask=%o" }, | |
206 | { opt_part, "part=%u" }, | |
207 | { opt_session, "session=%u" }, | |
208 | { opt_type, "type=%s" }, | |
209 | { opt_creator, "creator=%s" }, | |
210 | { opt_quiet, "quiet" }, | |
328b9227 RZ |
211 | { opt_codepage, "codepage=%s" }, |
212 | { opt_iocharset, "iocharset=%s" }, | |
1da177e4 LT |
213 | { opt_err, NULL } |
214 | }; | |
215 | ||
216 | static inline int match_fourchar(substring_t *arg, u32 *result) | |
217 | { | |
218 | if (arg->to - arg->from != 4) | |
219 | return -EINVAL; | |
220 | memcpy(result, arg->from, 4); | |
221 | return 0; | |
222 | } | |
223 | ||
224 | /* | |
225 | * parse_options() | |
226 | * | |
227 | * adapted from linux/fs/msdos/inode.c written 1992,93 by Werner Almesberger | |
228 | * This function is called by hfs_read_super() to parse the mount options. | |
229 | */ | |
230 | static int parse_options(char *options, struct hfs_sb_info *hsb) | |
231 | { | |
232 | char *p; | |
233 | substring_t args[MAX_OPT_ARGS]; | |
234 | int tmp, token; | |
235 | ||
236 | /* initialize the sb with defaults */ | |
94c9a5ee DH |
237 | hsb->s_uid = current_uid(); |
238 | hsb->s_gid = current_gid(); | |
1da177e4 LT |
239 | hsb->s_file_umask = 0133; |
240 | hsb->s_dir_umask = 0022; | |
241 | hsb->s_type = hsb->s_creator = cpu_to_be32(0x3f3f3f3f); /* == '????' */ | |
242 | hsb->s_quiet = 0; | |
243 | hsb->part = -1; | |
244 | hsb->session = -1; | |
245 | ||
246 | if (!options) | |
247 | return 1; | |
248 | ||
249 | while ((p = strsep(&options, ",")) != NULL) { | |
250 | if (!*p) | |
251 | continue; | |
252 | ||
253 | token = match_token(p, tokens, args); | |
254 | switch (token) { | |
255 | case opt_uid: | |
256 | if (match_int(&args[0], &tmp)) { | |
7cf3cc30 | 257 | printk(KERN_ERR "hfs: uid requires an argument\n"); |
1da177e4 LT |
258 | return 0; |
259 | } | |
260 | hsb->s_uid = (uid_t)tmp; | |
261 | break; | |
262 | case opt_gid: | |
263 | if (match_int(&args[0], &tmp)) { | |
7cf3cc30 | 264 | printk(KERN_ERR "hfs: gid requires an argument\n"); |
1da177e4 LT |
265 | return 0; |
266 | } | |
267 | hsb->s_gid = (gid_t)tmp; | |
268 | break; | |
269 | case opt_umask: | |
270 | if (match_octal(&args[0], &tmp)) { | |
7cf3cc30 | 271 | printk(KERN_ERR "hfs: umask requires a value\n"); |
1da177e4 LT |
272 | return 0; |
273 | } | |
274 | hsb->s_file_umask = (umode_t)tmp; | |
275 | hsb->s_dir_umask = (umode_t)tmp; | |
276 | break; | |
277 | case opt_file_umask: | |
278 | if (match_octal(&args[0], &tmp)) { | |
7cf3cc30 | 279 | printk(KERN_ERR "hfs: file_umask requires a value\n"); |
1da177e4 LT |
280 | return 0; |
281 | } | |
282 | hsb->s_file_umask = (umode_t)tmp; | |
283 | break; | |
284 | case opt_dir_umask: | |
285 | if (match_octal(&args[0], &tmp)) { | |
7cf3cc30 | 286 | printk(KERN_ERR "hfs: dir_umask requires a value\n"); |
1da177e4 LT |
287 | return 0; |
288 | } | |
289 | hsb->s_dir_umask = (umode_t)tmp; | |
290 | break; | |
291 | case opt_part: | |
292 | if (match_int(&args[0], &hsb->part)) { | |
7cf3cc30 | 293 | printk(KERN_ERR "hfs: part requires an argument\n"); |
1da177e4 LT |
294 | return 0; |
295 | } | |
296 | break; | |
297 | case opt_session: | |
298 | if (match_int(&args[0], &hsb->session)) { | |
7cf3cc30 | 299 | printk(KERN_ERR "hfs: session requires an argument\n"); |
1da177e4 LT |
300 | return 0; |
301 | } | |
302 | break; | |
303 | case opt_type: | |
304 | if (match_fourchar(&args[0], &hsb->s_type)) { | |
7cf3cc30 | 305 | printk(KERN_ERR "hfs: type requires a 4 character value\n"); |
1da177e4 LT |
306 | return 0; |
307 | } | |
308 | break; | |
309 | case opt_creator: | |
310 | if (match_fourchar(&args[0], &hsb->s_creator)) { | |
7cf3cc30 | 311 | printk(KERN_ERR "hfs: creator requires a 4 character value\n"); |
1da177e4 LT |
312 | return 0; |
313 | } | |
314 | break; | |
315 | case opt_quiet: | |
316 | hsb->s_quiet = 1; | |
317 | break; | |
328b9227 RZ |
318 | case opt_codepage: |
319 | if (hsb->nls_disk) { | |
7cf3cc30 | 320 | printk(KERN_ERR "hfs: unable to change codepage\n"); |
328b9227 RZ |
321 | return 0; |
322 | } | |
323 | p = match_strdup(&args[0]); | |
3fbe5c31 JM |
324 | if (p) |
325 | hsb->nls_disk = load_nls(p); | |
328b9227 | 326 | if (!hsb->nls_disk) { |
7cf3cc30 | 327 | printk(KERN_ERR "hfs: unable to load codepage \"%s\"\n", p); |
328b9227 RZ |
328 | kfree(p); |
329 | return 0; | |
330 | } | |
331 | kfree(p); | |
332 | break; | |
333 | case opt_iocharset: | |
334 | if (hsb->nls_io) { | |
7cf3cc30 | 335 | printk(KERN_ERR "hfs: unable to change iocharset\n"); |
328b9227 RZ |
336 | return 0; |
337 | } | |
338 | p = match_strdup(&args[0]); | |
3fbe5c31 JM |
339 | if (p) |
340 | hsb->nls_io = load_nls(p); | |
328b9227 | 341 | if (!hsb->nls_io) { |
7cf3cc30 | 342 | printk(KERN_ERR "hfs: unable to load iocharset \"%s\"\n", p); |
328b9227 RZ |
343 | kfree(p); |
344 | return 0; | |
345 | } | |
346 | kfree(p); | |
347 | break; | |
1da177e4 LT |
348 | default: |
349 | return 0; | |
350 | } | |
351 | } | |
352 | ||
328b9227 RZ |
353 | if (hsb->nls_disk && !hsb->nls_io) { |
354 | hsb->nls_io = load_nls_default(); | |
355 | if (!hsb->nls_io) { | |
7cf3cc30 | 356 | printk(KERN_ERR "hfs: unable to load default iocharset\n"); |
328b9227 RZ |
357 | return 0; |
358 | } | |
359 | } | |
1da177e4 LT |
360 | hsb->s_dir_umask &= 0777; |
361 | hsb->s_file_umask &= 0577; | |
362 | ||
363 | return 1; | |
364 | } | |
365 | ||
366 | /* | |
367 | * hfs_read_super() | |
368 | * | |
369 | * This is the function that is responsible for mounting an HFS | |
370 | * filesystem. It performs all the tasks necessary to get enough data | |
371 | * from the disk to read the root inode. This includes parsing the | |
372 | * mount options, dealing with Macintosh partitions, reading the | |
373 | * superblock and the allocation bitmap blocks, calling | |
374 | * hfs_btree_init() to get the necessary data about the extents and | |
375 | * catalog B-trees and, finally, reading the root inode into memory. | |
376 | */ | |
377 | static int hfs_fill_super(struct super_block *sb, void *data, int silent) | |
378 | { | |
379 | struct hfs_sb_info *sbi; | |
380 | struct hfs_find_data fd; | |
381 | hfs_cat_rec rec; | |
382 | struct inode *root_inode; | |
383 | int res; | |
384 | ||
f8314dc6 | 385 | sbi = kzalloc(sizeof(struct hfs_sb_info), GFP_KERNEL); |
1da177e4 LT |
386 | if (!sbi) |
387 | return -ENOMEM; | |
388 | sb->s_fs_info = sbi; | |
1da177e4 LT |
389 | INIT_HLIST_HEAD(&sbi->rsrc_inodes); |
390 | ||
391 | res = -EINVAL; | |
392 | if (!parse_options((char *)data, sbi)) { | |
7cf3cc30 | 393 | printk(KERN_ERR "hfs: unable to parse mount options.\n"); |
945b0920 | 394 | goto bail; |
1da177e4 LT |
395 | } |
396 | ||
397 | sb->s_op = &hfs_super_operations; | |
398 | sb->s_flags |= MS_NODIRATIME; | |
3084b72d | 399 | mutex_init(&sbi->bitmap_lock); |
1da177e4 LT |
400 | |
401 | res = hfs_mdb_get(sb); | |
402 | if (res) { | |
403 | if (!silent) | |
7cf3cc30 | 404 | printk(KERN_WARNING "hfs: can't find a HFS filesystem on dev %s.\n", |
1da177e4 LT |
405 | hfs_mdb_name(sb)); |
406 | res = -EINVAL; | |
945b0920 | 407 | goto bail; |
1da177e4 LT |
408 | } |
409 | ||
410 | /* try to get the root inode */ | |
411 | hfs_find_init(HFS_SB(sb)->cat_tree, &fd); | |
412 | res = hfs_cat_find_brec(sb, HFS_ROOT_CNID, &fd); | |
ec81aecb AW |
413 | if (!res) { |
414 | if (fd.entrylength > sizeof(rec) || fd.entrylength < 0) { | |
415 | res = -EIO; | |
416 | goto bail; | |
417 | } | |
1da177e4 | 418 | hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, fd.entrylength); |
ec81aecb | 419 | } |
1da177e4 LT |
420 | if (res) { |
421 | hfs_find_exit(&fd); | |
422 | goto bail_no_root; | |
423 | } | |
d6ddf554 | 424 | res = -EINVAL; |
1da177e4 LT |
425 | root_inode = hfs_iget(sb, &fd.search_key->cat, &rec); |
426 | hfs_find_exit(&fd); | |
427 | if (!root_inode) | |
428 | goto bail_no_root; | |
429 | ||
d6ddf554 | 430 | res = -ENOMEM; |
1da177e4 LT |
431 | sb->s_root = d_alloc_root(root_inode); |
432 | if (!sb->s_root) | |
433 | goto bail_iput; | |
434 | ||
435 | sb->s_root->d_op = &hfs_dentry_operations; | |
436 | ||
437 | /* everything's okay */ | |
438 | return 0; | |
439 | ||
440 | bail_iput: | |
441 | iput(root_inode); | |
442 | bail_no_root: | |
7cf3cc30 | 443 | printk(KERN_ERR "hfs: get root inode failed.\n"); |
945b0920 | 444 | bail: |
1da177e4 | 445 | hfs_mdb_put(sb); |
1da177e4 LT |
446 | return res; |
447 | } | |
448 | ||
454e2398 DH |
449 | static int hfs_get_sb(struct file_system_type *fs_type, |
450 | int flags, const char *dev_name, void *data, | |
451 | struct vfsmount *mnt) | |
1da177e4 | 452 | { |
454e2398 | 453 | return get_sb_bdev(fs_type, flags, dev_name, data, hfs_fill_super, mnt); |
1da177e4 LT |
454 | } |
455 | ||
456 | static struct file_system_type hfs_fs_type = { | |
457 | .owner = THIS_MODULE, | |
458 | .name = "hfs", | |
459 | .get_sb = hfs_get_sb, | |
460 | .kill_sb = kill_block_super, | |
461 | .fs_flags = FS_REQUIRES_DEV, | |
462 | }; | |
463 | ||
51cc5068 | 464 | static void hfs_init_once(void *p) |
1da177e4 LT |
465 | { |
466 | struct hfs_inode_info *i = p; | |
467 | ||
a35afb83 | 468 | inode_init_once(&i->vfs_inode); |
1da177e4 LT |
469 | } |
470 | ||
471 | static int __init init_hfs_fs(void) | |
472 | { | |
473 | int err; | |
474 | ||
475 | hfs_inode_cachep = kmem_cache_create("hfs_inode_cache", | |
476 | sizeof(struct hfs_inode_info), 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 477 | hfs_init_once); |
1da177e4 LT |
478 | if (!hfs_inode_cachep) |
479 | return -ENOMEM; | |
480 | err = register_filesystem(&hfs_fs_type); | |
481 | if (err) | |
482 | kmem_cache_destroy(hfs_inode_cachep); | |
483 | return err; | |
484 | } | |
485 | ||
486 | static void __exit exit_hfs_fs(void) | |
487 | { | |
488 | unregister_filesystem(&hfs_fs_type); | |
1a1d92c1 | 489 | kmem_cache_destroy(hfs_inode_cachep); |
1da177e4 LT |
490 | } |
491 | ||
492 | module_init(init_hfs_fs) | |
493 | module_exit(exit_hfs_fs) |