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