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