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> |
5a0e3ad6 | 22 | #include <linux/slab.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 | { | |
8c85e125 CH |
81 | if (sb->s_dirt) |
82 | hfs_write_super(sb); | |
1da177e4 LT |
83 | hfs_mdb_close(sb); |
84 | /* release the MDB's resources */ | |
85 | hfs_mdb_put(sb); | |
86 | } | |
87 | ||
88 | /* | |
89 | * hfs_statfs() | |
90 | * | |
91 | * This is the statfs() entry in the super_operations structure for | |
92 | * HFS filesystems. The purpose is to return various data about the | |
93 | * filesystem. | |
94 | * | |
95 | * changed f_files/f_ffree to reflect the fs_ablock/free_ablocks. | |
96 | */ | |
726c3342 | 97 | static int hfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 98 | { |
726c3342 | 99 | struct super_block *sb = dentry->d_sb; |
7dd2c000 | 100 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
726c3342 | 101 | |
1da177e4 LT |
102 | buf->f_type = HFS_SUPER_MAGIC; |
103 | buf->f_bsize = sb->s_blocksize; | |
104 | buf->f_blocks = (u32)HFS_SB(sb)->fs_ablocks * HFS_SB(sb)->fs_div; | |
105 | buf->f_bfree = (u32)HFS_SB(sb)->free_ablocks * HFS_SB(sb)->fs_div; | |
106 | buf->f_bavail = buf->f_bfree; | |
107 | buf->f_files = HFS_SB(sb)->fs_ablocks; | |
108 | buf->f_ffree = HFS_SB(sb)->free_ablocks; | |
7dd2c000 CL |
109 | buf->f_fsid.val[0] = (u32)id; |
110 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
1da177e4 LT |
111 | buf->f_namelen = HFS_NAMELEN; |
112 | ||
113 | return 0; | |
114 | } | |
115 | ||
116 | static int hfs_remount(struct super_block *sb, int *flags, char *data) | |
117 | { | |
118 | *flags |= MS_NODIRATIME; | |
119 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) | |
120 | return 0; | |
121 | if (!(*flags & MS_RDONLY)) { | |
122 | if (!(HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_UNMNT))) { | |
7cf3cc30 | 123 | printk(KERN_WARNING "hfs: filesystem was not cleanly unmounted, " |
1da177e4 LT |
124 | "running fsck.hfs is recommended. leaving read-only.\n"); |
125 | sb->s_flags |= MS_RDONLY; | |
126 | *flags |= MS_RDONLY; | |
127 | } else if (HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_SLOCK)) { | |
7cf3cc30 | 128 | printk(KERN_WARNING "hfs: filesystem is marked locked, leaving read-only.\n"); |
1da177e4 LT |
129 | sb->s_flags |= MS_RDONLY; |
130 | *flags |= MS_RDONLY; | |
131 | } | |
132 | } | |
133 | return 0; | |
134 | } | |
135 | ||
717dd80e RZ |
136 | static int hfs_show_options(struct seq_file *seq, struct vfsmount *mnt) |
137 | { | |
138 | struct hfs_sb_info *sbi = HFS_SB(mnt->mnt_sb); | |
139 | ||
140 | if (sbi->s_creator != cpu_to_be32(0x3f3f3f3f)) | |
141 | seq_printf(seq, ",creator=%.4s", (char *)&sbi->s_creator); | |
142 | if (sbi->s_type != cpu_to_be32(0x3f3f3f3f)) | |
143 | seq_printf(seq, ",type=%.4s", (char *)&sbi->s_type); | |
144 | seq_printf(seq, ",uid=%u,gid=%u", sbi->s_uid, sbi->s_gid); | |
145 | if (sbi->s_file_umask != 0133) | |
146 | seq_printf(seq, ",file_umask=%o", sbi->s_file_umask); | |
147 | if (sbi->s_dir_umask != 0022) | |
148 | seq_printf(seq, ",dir_umask=%o", sbi->s_dir_umask); | |
149 | if (sbi->part >= 0) | |
150 | seq_printf(seq, ",part=%u", sbi->part); | |
151 | if (sbi->session >= 0) | |
152 | seq_printf(seq, ",session=%u", sbi->session); | |
328b9227 RZ |
153 | if (sbi->nls_disk) |
154 | seq_printf(seq, ",codepage=%s", sbi->nls_disk->charset); | |
155 | if (sbi->nls_io) | |
156 | seq_printf(seq, ",iocharset=%s", sbi->nls_io->charset); | |
717dd80e RZ |
157 | if (sbi->s_quiet) |
158 | seq_printf(seq, ",quiet"); | |
159 | return 0; | |
160 | } | |
161 | ||
1da177e4 LT |
162 | static struct inode *hfs_alloc_inode(struct super_block *sb) |
163 | { | |
164 | struct hfs_inode_info *i; | |
165 | ||
e94b1766 | 166 | i = kmem_cache_alloc(hfs_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
167 | return i ? &i->vfs_inode : NULL; |
168 | } | |
169 | ||
170 | static void hfs_destroy_inode(struct inode *inode) | |
171 | { | |
172 | kmem_cache_free(hfs_inode_cachep, HFS_I(inode)); | |
173 | } | |
174 | ||
ee9b6d61 | 175 | static const struct super_operations hfs_super_operations = { |
1da177e4 LT |
176 | .alloc_inode = hfs_alloc_inode, |
177 | .destroy_inode = hfs_destroy_inode, | |
178 | .write_inode = hfs_write_inode, | |
b57922d9 | 179 | .evict_inode = hfs_evict_inode, |
1da177e4 LT |
180 | .put_super = hfs_put_super, |
181 | .write_super = hfs_write_super, | |
58bc5bbb | 182 | .sync_fs = hfs_sync_fs, |
1da177e4 LT |
183 | .statfs = hfs_statfs, |
184 | .remount_fs = hfs_remount, | |
717dd80e | 185 | .show_options = hfs_show_options, |
1da177e4 LT |
186 | }; |
187 | ||
188 | enum { | |
189 | opt_uid, opt_gid, opt_umask, opt_file_umask, opt_dir_umask, | |
190 | opt_part, opt_session, opt_type, opt_creator, opt_quiet, | |
328b9227 | 191 | opt_codepage, opt_iocharset, |
1da177e4 LT |
192 | opt_err |
193 | }; | |
194 | ||
a447c093 | 195 | static const match_table_t tokens = { |
1da177e4 LT |
196 | { opt_uid, "uid=%u" }, |
197 | { opt_gid, "gid=%u" }, | |
198 | { opt_umask, "umask=%o" }, | |
199 | { opt_file_umask, "file_umask=%o" }, | |
200 | { opt_dir_umask, "dir_umask=%o" }, | |
201 | { opt_part, "part=%u" }, | |
202 | { opt_session, "session=%u" }, | |
203 | { opt_type, "type=%s" }, | |
204 | { opt_creator, "creator=%s" }, | |
205 | { opt_quiet, "quiet" }, | |
328b9227 RZ |
206 | { opt_codepage, "codepage=%s" }, |
207 | { opt_iocharset, "iocharset=%s" }, | |
1da177e4 LT |
208 | { opt_err, NULL } |
209 | }; | |
210 | ||
211 | static inline int match_fourchar(substring_t *arg, u32 *result) | |
212 | { | |
213 | if (arg->to - arg->from != 4) | |
214 | return -EINVAL; | |
215 | memcpy(result, arg->from, 4); | |
216 | return 0; | |
217 | } | |
218 | ||
219 | /* | |
220 | * parse_options() | |
221 | * | |
222 | * adapted from linux/fs/msdos/inode.c written 1992,93 by Werner Almesberger | |
223 | * This function is called by hfs_read_super() to parse the mount options. | |
224 | */ | |
225 | static int parse_options(char *options, struct hfs_sb_info *hsb) | |
226 | { | |
227 | char *p; | |
228 | substring_t args[MAX_OPT_ARGS]; | |
229 | int tmp, token; | |
230 | ||
231 | /* initialize the sb with defaults */ | |
94c9a5ee DH |
232 | hsb->s_uid = current_uid(); |
233 | hsb->s_gid = current_gid(); | |
1da177e4 LT |
234 | hsb->s_file_umask = 0133; |
235 | hsb->s_dir_umask = 0022; | |
236 | hsb->s_type = hsb->s_creator = cpu_to_be32(0x3f3f3f3f); /* == '????' */ | |
237 | hsb->s_quiet = 0; | |
238 | hsb->part = -1; | |
239 | hsb->session = -1; | |
240 | ||
241 | if (!options) | |
242 | return 1; | |
243 | ||
244 | while ((p = strsep(&options, ",")) != NULL) { | |
245 | if (!*p) | |
246 | continue; | |
247 | ||
248 | token = match_token(p, tokens, args); | |
249 | switch (token) { | |
250 | case opt_uid: | |
251 | if (match_int(&args[0], &tmp)) { | |
7cf3cc30 | 252 | printk(KERN_ERR "hfs: uid requires an argument\n"); |
1da177e4 LT |
253 | return 0; |
254 | } | |
255 | hsb->s_uid = (uid_t)tmp; | |
256 | break; | |
257 | case opt_gid: | |
258 | if (match_int(&args[0], &tmp)) { | |
7cf3cc30 | 259 | printk(KERN_ERR "hfs: gid requires an argument\n"); |
1da177e4 LT |
260 | return 0; |
261 | } | |
262 | hsb->s_gid = (gid_t)tmp; | |
263 | break; | |
264 | case opt_umask: | |
265 | if (match_octal(&args[0], &tmp)) { | |
7cf3cc30 | 266 | printk(KERN_ERR "hfs: umask requires a value\n"); |
1da177e4 LT |
267 | return 0; |
268 | } | |
269 | hsb->s_file_umask = (umode_t)tmp; | |
270 | hsb->s_dir_umask = (umode_t)tmp; | |
271 | break; | |
272 | case opt_file_umask: | |
273 | if (match_octal(&args[0], &tmp)) { | |
7cf3cc30 | 274 | printk(KERN_ERR "hfs: file_umask requires a value\n"); |
1da177e4 LT |
275 | return 0; |
276 | } | |
277 | hsb->s_file_umask = (umode_t)tmp; | |
278 | break; | |
279 | case opt_dir_umask: | |
280 | if (match_octal(&args[0], &tmp)) { | |
7cf3cc30 | 281 | printk(KERN_ERR "hfs: dir_umask requires a value\n"); |
1da177e4 LT |
282 | return 0; |
283 | } | |
284 | hsb->s_dir_umask = (umode_t)tmp; | |
285 | break; | |
286 | case opt_part: | |
287 | if (match_int(&args[0], &hsb->part)) { | |
7cf3cc30 | 288 | printk(KERN_ERR "hfs: part requires an argument\n"); |
1da177e4 LT |
289 | return 0; |
290 | } | |
291 | break; | |
292 | case opt_session: | |
293 | if (match_int(&args[0], &hsb->session)) { | |
7cf3cc30 | 294 | printk(KERN_ERR "hfs: session requires an argument\n"); |
1da177e4 LT |
295 | return 0; |
296 | } | |
297 | break; | |
298 | case opt_type: | |
299 | if (match_fourchar(&args[0], &hsb->s_type)) { | |
7cf3cc30 | 300 | printk(KERN_ERR "hfs: type requires a 4 character value\n"); |
1da177e4 LT |
301 | return 0; |
302 | } | |
303 | break; | |
304 | case opt_creator: | |
305 | if (match_fourchar(&args[0], &hsb->s_creator)) { | |
7cf3cc30 | 306 | printk(KERN_ERR "hfs: creator requires a 4 character value\n"); |
1da177e4 LT |
307 | return 0; |
308 | } | |
309 | break; | |
310 | case opt_quiet: | |
311 | hsb->s_quiet = 1; | |
312 | break; | |
328b9227 RZ |
313 | case opt_codepage: |
314 | if (hsb->nls_disk) { | |
7cf3cc30 | 315 | printk(KERN_ERR "hfs: unable to change codepage\n"); |
328b9227 RZ |
316 | return 0; |
317 | } | |
318 | p = match_strdup(&args[0]); | |
3fbe5c31 JM |
319 | if (p) |
320 | hsb->nls_disk = load_nls(p); | |
328b9227 | 321 | if (!hsb->nls_disk) { |
7cf3cc30 | 322 | printk(KERN_ERR "hfs: unable to load codepage \"%s\"\n", p); |
328b9227 RZ |
323 | kfree(p); |
324 | return 0; | |
325 | } | |
326 | kfree(p); | |
327 | break; | |
328 | case opt_iocharset: | |
329 | if (hsb->nls_io) { | |
7cf3cc30 | 330 | printk(KERN_ERR "hfs: unable to change iocharset\n"); |
328b9227 RZ |
331 | return 0; |
332 | } | |
333 | p = match_strdup(&args[0]); | |
3fbe5c31 JM |
334 | if (p) |
335 | hsb->nls_io = load_nls(p); | |
328b9227 | 336 | if (!hsb->nls_io) { |
7cf3cc30 | 337 | printk(KERN_ERR "hfs: unable to load iocharset \"%s\"\n", p); |
328b9227 RZ |
338 | kfree(p); |
339 | return 0; | |
340 | } | |
341 | kfree(p); | |
342 | break; | |
1da177e4 LT |
343 | default: |
344 | return 0; | |
345 | } | |
346 | } | |
347 | ||
328b9227 RZ |
348 | if (hsb->nls_disk && !hsb->nls_io) { |
349 | hsb->nls_io = load_nls_default(); | |
350 | if (!hsb->nls_io) { | |
7cf3cc30 | 351 | printk(KERN_ERR "hfs: unable to load default iocharset\n"); |
328b9227 RZ |
352 | return 0; |
353 | } | |
354 | } | |
1da177e4 LT |
355 | hsb->s_dir_umask &= 0777; |
356 | hsb->s_file_umask &= 0577; | |
357 | ||
358 | return 1; | |
359 | } | |
360 | ||
361 | /* | |
362 | * hfs_read_super() | |
363 | * | |
364 | * This is the function that is responsible for mounting an HFS | |
365 | * filesystem. It performs all the tasks necessary to get enough data | |
366 | * from the disk to read the root inode. This includes parsing the | |
367 | * mount options, dealing with Macintosh partitions, reading the | |
368 | * superblock and the allocation bitmap blocks, calling | |
369 | * hfs_btree_init() to get the necessary data about the extents and | |
370 | * catalog B-trees and, finally, reading the root inode into memory. | |
371 | */ | |
372 | static int hfs_fill_super(struct super_block *sb, void *data, int silent) | |
373 | { | |
374 | struct hfs_sb_info *sbi; | |
375 | struct hfs_find_data fd; | |
376 | hfs_cat_rec rec; | |
377 | struct inode *root_inode; | |
378 | int res; | |
379 | ||
f8314dc6 | 380 | sbi = kzalloc(sizeof(struct hfs_sb_info), GFP_KERNEL); |
8526fb37 | 381 | if (!sbi) |
1da177e4 | 382 | return -ENOMEM; |
8526fb37 | 383 | |
1da177e4 | 384 | sb->s_fs_info = sbi; |
1da177e4 LT |
385 | |
386 | res = -EINVAL; | |
387 | if (!parse_options((char *)data, sbi)) { | |
7cf3cc30 | 388 | printk(KERN_ERR "hfs: unable to parse mount options.\n"); |
945b0920 | 389 | goto bail; |
1da177e4 LT |
390 | } |
391 | ||
392 | sb->s_op = &hfs_super_operations; | |
393 | sb->s_flags |= MS_NODIRATIME; | |
3084b72d | 394 | mutex_init(&sbi->bitmap_lock); |
1da177e4 LT |
395 | |
396 | res = hfs_mdb_get(sb); | |
397 | if (res) { | |
398 | if (!silent) | |
7cf3cc30 | 399 | printk(KERN_WARNING "hfs: can't find a HFS filesystem on dev %s.\n", |
1da177e4 LT |
400 | hfs_mdb_name(sb)); |
401 | res = -EINVAL; | |
945b0920 | 402 | goto bail; |
1da177e4 LT |
403 | } |
404 | ||
405 | /* try to get the root inode */ | |
406 | hfs_find_init(HFS_SB(sb)->cat_tree, &fd); | |
407 | res = hfs_cat_find_brec(sb, HFS_ROOT_CNID, &fd); | |
ec81aecb AW |
408 | if (!res) { |
409 | if (fd.entrylength > sizeof(rec) || fd.entrylength < 0) { | |
410 | res = -EIO; | |
411 | goto bail; | |
412 | } | |
1da177e4 | 413 | hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, fd.entrylength); |
ec81aecb | 414 | } |
1da177e4 LT |
415 | if (res) { |
416 | hfs_find_exit(&fd); | |
417 | goto bail_no_root; | |
418 | } | |
d6ddf554 | 419 | res = -EINVAL; |
1da177e4 LT |
420 | root_inode = hfs_iget(sb, &fd.search_key->cat, &rec); |
421 | hfs_find_exit(&fd); | |
422 | if (!root_inode) | |
423 | goto bail_no_root; | |
424 | ||
d6ddf554 | 425 | res = -ENOMEM; |
1da177e4 LT |
426 | sb->s_root = d_alloc_root(root_inode); |
427 | if (!sb->s_root) | |
428 | goto bail_iput; | |
429 | ||
430 | sb->s_root->d_op = &hfs_dentry_operations; | |
431 | ||
432 | /* everything's okay */ | |
433 | return 0; | |
434 | ||
435 | bail_iput: | |
436 | iput(root_inode); | |
437 | bail_no_root: | |
7cf3cc30 | 438 | printk(KERN_ERR "hfs: get root inode failed.\n"); |
945b0920 | 439 | bail: |
1da177e4 | 440 | hfs_mdb_put(sb); |
1da177e4 LT |
441 | return res; |
442 | } | |
443 | ||
454e2398 DH |
444 | static int hfs_get_sb(struct file_system_type *fs_type, |
445 | int flags, const char *dev_name, void *data, | |
446 | struct vfsmount *mnt) | |
1da177e4 | 447 | { |
454e2398 | 448 | return get_sb_bdev(fs_type, flags, dev_name, data, hfs_fill_super, mnt); |
1da177e4 LT |
449 | } |
450 | ||
451 | static struct file_system_type hfs_fs_type = { | |
452 | .owner = THIS_MODULE, | |
453 | .name = "hfs", | |
454 | .get_sb = hfs_get_sb, | |
455 | .kill_sb = kill_block_super, | |
456 | .fs_flags = FS_REQUIRES_DEV, | |
457 | }; | |
458 | ||
51cc5068 | 459 | static void hfs_init_once(void *p) |
1da177e4 LT |
460 | { |
461 | struct hfs_inode_info *i = p; | |
462 | ||
a35afb83 | 463 | inode_init_once(&i->vfs_inode); |
1da177e4 LT |
464 | } |
465 | ||
466 | static int __init init_hfs_fs(void) | |
467 | { | |
468 | int err; | |
469 | ||
470 | hfs_inode_cachep = kmem_cache_create("hfs_inode_cache", | |
471 | sizeof(struct hfs_inode_info), 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 472 | hfs_init_once); |
1da177e4 LT |
473 | if (!hfs_inode_cachep) |
474 | return -ENOMEM; | |
475 | err = register_filesystem(&hfs_fs_type); | |
476 | if (err) | |
477 | kmem_cache_destroy(hfs_inode_cachep); | |
478 | return err; | |
479 | } | |
480 | ||
481 | static void __exit exit_hfs_fs(void) | |
482 | { | |
483 | unregister_filesystem(&hfs_fs_type); | |
1a1d92c1 | 484 | kmem_cache_destroy(hfs_inode_cachep); |
1da177e4 LT |
485 | } |
486 | ||
487 | module_init(init_hfs_fs) | |
488 | module_exit(exit_hfs_fs) |