]>
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 | ||
15 | #include <linux/config.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/blkdev.h> | |
717dd80e | 18 | #include <linux/mount.h> |
1da177e4 | 19 | #include <linux/init.h> |
328b9227 | 20 | #include <linux/nls.h> |
1da177e4 | 21 | #include <linux/parser.h> |
717dd80e | 22 | #include <linux/seq_file.h> |
1da177e4 LT |
23 | #include <linux/vfs.h> |
24 | ||
25 | #include "hfs_fs.h" | |
26 | #include "btree.h" | |
27 | ||
28 | static kmem_cache_t *hfs_inode_cachep; | |
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 | { | |
53 | sb->s_dirt = 0; | |
54 | if (sb->s_flags & MS_RDONLY) | |
55 | return; | |
56 | /* sync everything to the buffers */ | |
57 | hfs_mdb_commit(sb); | |
58 | } | |
59 | ||
60 | /* | |
61 | * hfs_put_super() | |
62 | * | |
63 | * This is the put_super() entry in the super_operations structure for | |
64 | * HFS filesystems. The purpose is to release the resources | |
65 | * associated with the superblock sb. | |
66 | */ | |
67 | static void hfs_put_super(struct super_block *sb) | |
68 | { | |
69 | hfs_mdb_close(sb); | |
70 | /* release the MDB's resources */ | |
71 | hfs_mdb_put(sb); | |
72 | } | |
73 | ||
74 | /* | |
75 | * hfs_statfs() | |
76 | * | |
77 | * This is the statfs() entry in the super_operations structure for | |
78 | * HFS filesystems. The purpose is to return various data about the | |
79 | * filesystem. | |
80 | * | |
81 | * changed f_files/f_ffree to reflect the fs_ablock/free_ablocks. | |
82 | */ | |
83 | static int hfs_statfs(struct super_block *sb, struct kstatfs *buf) | |
84 | { | |
85 | buf->f_type = HFS_SUPER_MAGIC; | |
86 | buf->f_bsize = sb->s_blocksize; | |
87 | buf->f_blocks = (u32)HFS_SB(sb)->fs_ablocks * HFS_SB(sb)->fs_div; | |
88 | buf->f_bfree = (u32)HFS_SB(sb)->free_ablocks * HFS_SB(sb)->fs_div; | |
89 | buf->f_bavail = buf->f_bfree; | |
90 | buf->f_files = HFS_SB(sb)->fs_ablocks; | |
91 | buf->f_ffree = HFS_SB(sb)->free_ablocks; | |
92 | buf->f_namelen = HFS_NAMELEN; | |
93 | ||
94 | return 0; | |
95 | } | |
96 | ||
97 | static int hfs_remount(struct super_block *sb, int *flags, char *data) | |
98 | { | |
99 | *flags |= MS_NODIRATIME; | |
100 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) | |
101 | return 0; | |
102 | if (!(*flags & MS_RDONLY)) { | |
103 | if (!(HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_UNMNT))) { | |
104 | printk("HFS-fs warning: Filesystem was not cleanly unmounted, " | |
105 | "running fsck.hfs is recommended. leaving read-only.\n"); | |
106 | sb->s_flags |= MS_RDONLY; | |
107 | *flags |= MS_RDONLY; | |
108 | } else if (HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_SLOCK)) { | |
109 | printk("HFS-fs: Filesystem is marked locked, leaving read-only.\n"); | |
110 | sb->s_flags |= MS_RDONLY; | |
111 | *flags |= MS_RDONLY; | |
112 | } | |
113 | } | |
114 | return 0; | |
115 | } | |
116 | ||
717dd80e RZ |
117 | static int hfs_show_options(struct seq_file *seq, struct vfsmount *mnt) |
118 | { | |
119 | struct hfs_sb_info *sbi = HFS_SB(mnt->mnt_sb); | |
120 | ||
121 | if (sbi->s_creator != cpu_to_be32(0x3f3f3f3f)) | |
122 | seq_printf(seq, ",creator=%.4s", (char *)&sbi->s_creator); | |
123 | if (sbi->s_type != cpu_to_be32(0x3f3f3f3f)) | |
124 | seq_printf(seq, ",type=%.4s", (char *)&sbi->s_type); | |
125 | seq_printf(seq, ",uid=%u,gid=%u", sbi->s_uid, sbi->s_gid); | |
126 | if (sbi->s_file_umask != 0133) | |
127 | seq_printf(seq, ",file_umask=%o", sbi->s_file_umask); | |
128 | if (sbi->s_dir_umask != 0022) | |
129 | seq_printf(seq, ",dir_umask=%o", sbi->s_dir_umask); | |
130 | if (sbi->part >= 0) | |
131 | seq_printf(seq, ",part=%u", sbi->part); | |
132 | if (sbi->session >= 0) | |
133 | seq_printf(seq, ",session=%u", sbi->session); | |
328b9227 RZ |
134 | if (sbi->nls_disk) |
135 | seq_printf(seq, ",codepage=%s", sbi->nls_disk->charset); | |
136 | if (sbi->nls_io) | |
137 | seq_printf(seq, ",iocharset=%s", sbi->nls_io->charset); | |
717dd80e RZ |
138 | if (sbi->s_quiet) |
139 | seq_printf(seq, ",quiet"); | |
140 | return 0; | |
141 | } | |
142 | ||
1da177e4 LT |
143 | static struct inode *hfs_alloc_inode(struct super_block *sb) |
144 | { | |
145 | struct hfs_inode_info *i; | |
146 | ||
147 | i = kmem_cache_alloc(hfs_inode_cachep, SLAB_KERNEL); | |
148 | return i ? &i->vfs_inode : NULL; | |
149 | } | |
150 | ||
151 | static void hfs_destroy_inode(struct inode *inode) | |
152 | { | |
153 | kmem_cache_free(hfs_inode_cachep, HFS_I(inode)); | |
154 | } | |
155 | ||
156 | static struct super_operations hfs_super_operations = { | |
157 | .alloc_inode = hfs_alloc_inode, | |
158 | .destroy_inode = hfs_destroy_inode, | |
159 | .write_inode = hfs_write_inode, | |
160 | .clear_inode = hfs_clear_inode, | |
161 | .put_super = hfs_put_super, | |
162 | .write_super = hfs_write_super, | |
163 | .statfs = hfs_statfs, | |
164 | .remount_fs = hfs_remount, | |
717dd80e | 165 | .show_options = hfs_show_options, |
1da177e4 LT |
166 | }; |
167 | ||
168 | enum { | |
169 | opt_uid, opt_gid, opt_umask, opt_file_umask, opt_dir_umask, | |
170 | opt_part, opt_session, opt_type, opt_creator, opt_quiet, | |
328b9227 | 171 | opt_codepage, opt_iocharset, |
1da177e4 LT |
172 | opt_err |
173 | }; | |
174 | ||
175 | static match_table_t tokens = { | |
176 | { opt_uid, "uid=%u" }, | |
177 | { opt_gid, "gid=%u" }, | |
178 | { opt_umask, "umask=%o" }, | |
179 | { opt_file_umask, "file_umask=%o" }, | |
180 | { opt_dir_umask, "dir_umask=%o" }, | |
181 | { opt_part, "part=%u" }, | |
182 | { opt_session, "session=%u" }, | |
183 | { opt_type, "type=%s" }, | |
184 | { opt_creator, "creator=%s" }, | |
185 | { opt_quiet, "quiet" }, | |
328b9227 RZ |
186 | { opt_codepage, "codepage=%s" }, |
187 | { opt_iocharset, "iocharset=%s" }, | |
1da177e4 LT |
188 | { opt_err, NULL } |
189 | }; | |
190 | ||
191 | static inline int match_fourchar(substring_t *arg, u32 *result) | |
192 | { | |
193 | if (arg->to - arg->from != 4) | |
194 | return -EINVAL; | |
195 | memcpy(result, arg->from, 4); | |
196 | return 0; | |
197 | } | |
198 | ||
199 | /* | |
200 | * parse_options() | |
201 | * | |
202 | * adapted from linux/fs/msdos/inode.c written 1992,93 by Werner Almesberger | |
203 | * This function is called by hfs_read_super() to parse the mount options. | |
204 | */ | |
205 | static int parse_options(char *options, struct hfs_sb_info *hsb) | |
206 | { | |
207 | char *p; | |
208 | substring_t args[MAX_OPT_ARGS]; | |
209 | int tmp, token; | |
210 | ||
211 | /* initialize the sb with defaults */ | |
212 | hsb->s_uid = current->uid; | |
213 | hsb->s_gid = current->gid; | |
214 | hsb->s_file_umask = 0133; | |
215 | hsb->s_dir_umask = 0022; | |
216 | hsb->s_type = hsb->s_creator = cpu_to_be32(0x3f3f3f3f); /* == '????' */ | |
217 | hsb->s_quiet = 0; | |
218 | hsb->part = -1; | |
219 | hsb->session = -1; | |
220 | ||
221 | if (!options) | |
222 | return 1; | |
223 | ||
224 | while ((p = strsep(&options, ",")) != NULL) { | |
225 | if (!*p) | |
226 | continue; | |
227 | ||
228 | token = match_token(p, tokens, args); | |
229 | switch (token) { | |
230 | case opt_uid: | |
231 | if (match_int(&args[0], &tmp)) { | |
232 | printk("HFS: uid requires an argument\n"); | |
233 | return 0; | |
234 | } | |
235 | hsb->s_uid = (uid_t)tmp; | |
236 | break; | |
237 | case opt_gid: | |
238 | if (match_int(&args[0], &tmp)) { | |
239 | printk("HFS: gid requires an argument\n"); | |
240 | return 0; | |
241 | } | |
242 | hsb->s_gid = (gid_t)tmp; | |
243 | break; | |
244 | case opt_umask: | |
245 | if (match_octal(&args[0], &tmp)) { | |
246 | printk("HFS: umask requires a value\n"); | |
247 | return 0; | |
248 | } | |
249 | hsb->s_file_umask = (umode_t)tmp; | |
250 | hsb->s_dir_umask = (umode_t)tmp; | |
251 | break; | |
252 | case opt_file_umask: | |
253 | if (match_octal(&args[0], &tmp)) { | |
254 | printk("HFS: file_umask requires a value\n"); | |
255 | return 0; | |
256 | } | |
257 | hsb->s_file_umask = (umode_t)tmp; | |
258 | break; | |
259 | case opt_dir_umask: | |
260 | if (match_octal(&args[0], &tmp)) { | |
261 | printk("HFS: dir_umask requires a value\n"); | |
262 | return 0; | |
263 | } | |
264 | hsb->s_dir_umask = (umode_t)tmp; | |
265 | break; | |
266 | case opt_part: | |
267 | if (match_int(&args[0], &hsb->part)) { | |
268 | printk("HFS: part requires an argument\n"); | |
269 | return 0; | |
270 | } | |
271 | break; | |
272 | case opt_session: | |
273 | if (match_int(&args[0], &hsb->session)) { | |
274 | printk("HFS: session requires an argument\n"); | |
275 | return 0; | |
276 | } | |
277 | break; | |
278 | case opt_type: | |
279 | if (match_fourchar(&args[0], &hsb->s_type)) { | |
280 | printk("HFS+-fs: type requires a 4 character value\n"); | |
281 | return 0; | |
282 | } | |
283 | break; | |
284 | case opt_creator: | |
285 | if (match_fourchar(&args[0], &hsb->s_creator)) { | |
286 | printk("HFS+-fs: creator requires a 4 character value\n"); | |
287 | return 0; | |
288 | } | |
289 | break; | |
290 | case opt_quiet: | |
291 | hsb->s_quiet = 1; | |
292 | break; | |
328b9227 RZ |
293 | case opt_codepage: |
294 | if (hsb->nls_disk) { | |
295 | printk("HFS+-fs: unable to change codepage\n"); | |
296 | return 0; | |
297 | } | |
298 | p = match_strdup(&args[0]); | |
299 | hsb->nls_disk = load_nls(p); | |
300 | if (!hsb->nls_disk) { | |
301 | printk("HFS+-fs: unable to load codepage \"%s\"\n", p); | |
302 | kfree(p); | |
303 | return 0; | |
304 | } | |
305 | kfree(p); | |
306 | break; | |
307 | case opt_iocharset: | |
308 | if (hsb->nls_io) { | |
309 | printk("HFS: unable to change iocharset\n"); | |
310 | return 0; | |
311 | } | |
312 | p = match_strdup(&args[0]); | |
313 | hsb->nls_io = load_nls(p); | |
314 | if (!hsb->nls_io) { | |
315 | printk("HFS: unable to load iocharset \"%s\"\n", p); | |
316 | kfree(p); | |
317 | return 0; | |
318 | } | |
319 | kfree(p); | |
320 | break; | |
1da177e4 LT |
321 | default: |
322 | return 0; | |
323 | } | |
324 | } | |
325 | ||
328b9227 RZ |
326 | if (hsb->nls_disk && !hsb->nls_io) { |
327 | hsb->nls_io = load_nls_default(); | |
328 | if (!hsb->nls_io) { | |
329 | printk("HFS: unable to load default iocharset\n"); | |
330 | return 0; | |
331 | } | |
332 | } | |
1da177e4 LT |
333 | hsb->s_dir_umask &= 0777; |
334 | hsb->s_file_umask &= 0577; | |
335 | ||
336 | return 1; | |
337 | } | |
338 | ||
339 | /* | |
340 | * hfs_read_super() | |
341 | * | |
342 | * This is the function that is responsible for mounting an HFS | |
343 | * filesystem. It performs all the tasks necessary to get enough data | |
344 | * from the disk to read the root inode. This includes parsing the | |
345 | * mount options, dealing with Macintosh partitions, reading the | |
346 | * superblock and the allocation bitmap blocks, calling | |
347 | * hfs_btree_init() to get the necessary data about the extents and | |
348 | * catalog B-trees and, finally, reading the root inode into memory. | |
349 | */ | |
350 | static int hfs_fill_super(struct super_block *sb, void *data, int silent) | |
351 | { | |
352 | struct hfs_sb_info *sbi; | |
353 | struct hfs_find_data fd; | |
354 | hfs_cat_rec rec; | |
355 | struct inode *root_inode; | |
356 | int res; | |
357 | ||
358 | sbi = kmalloc(sizeof(struct hfs_sb_info), GFP_KERNEL); | |
359 | if (!sbi) | |
360 | return -ENOMEM; | |
361 | sb->s_fs_info = sbi; | |
362 | memset(sbi, 0, sizeof(struct hfs_sb_info)); | |
363 | INIT_HLIST_HEAD(&sbi->rsrc_inodes); | |
364 | ||
365 | res = -EINVAL; | |
366 | if (!parse_options((char *)data, sbi)) { | |
367 | hfs_warn("hfs_fs: 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) | |
378 | hfs_warn("VFS: Can't find a HFS filesystem on dev %s.\n", | |
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 | } | |
393 | root_inode = hfs_iget(sb, &fd.search_key->cat, &rec); | |
394 | hfs_find_exit(&fd); | |
395 | if (!root_inode) | |
396 | goto bail_no_root; | |
397 | ||
398 | sb->s_root = d_alloc_root(root_inode); | |
399 | if (!sb->s_root) | |
400 | goto bail_iput; | |
401 | ||
402 | sb->s_root->d_op = &hfs_dentry_operations; | |
403 | ||
404 | /* everything's okay */ | |
405 | return 0; | |
406 | ||
407 | bail_iput: | |
408 | iput(root_inode); | |
409 | bail_no_root: | |
410 | hfs_warn("hfs_fs: get root inode failed.\n"); | |
945b0920 | 411 | bail: |
1da177e4 | 412 | hfs_mdb_put(sb); |
1da177e4 LT |
413 | return res; |
414 | } | |
415 | ||
416 | static struct super_block *hfs_get_sb(struct file_system_type *fs_type, | |
417 | int flags, const char *dev_name, void *data) | |
418 | { | |
419 | return get_sb_bdev(fs_type, flags, dev_name, data, hfs_fill_super); | |
420 | } | |
421 | ||
422 | static struct file_system_type hfs_fs_type = { | |
423 | .owner = THIS_MODULE, | |
424 | .name = "hfs", | |
425 | .get_sb = hfs_get_sb, | |
426 | .kill_sb = kill_block_super, | |
427 | .fs_flags = FS_REQUIRES_DEV, | |
428 | }; | |
429 | ||
430 | static void hfs_init_once(void *p, kmem_cache_t *cachep, unsigned long flags) | |
431 | { | |
432 | struct hfs_inode_info *i = p; | |
433 | ||
434 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == SLAB_CTOR_CONSTRUCTOR) | |
435 | inode_init_once(&i->vfs_inode); | |
436 | } | |
437 | ||
438 | static int __init init_hfs_fs(void) | |
439 | { | |
440 | int err; | |
441 | ||
442 | hfs_inode_cachep = kmem_cache_create("hfs_inode_cache", | |
443 | sizeof(struct hfs_inode_info), 0, SLAB_HWCACHE_ALIGN, | |
444 | hfs_init_once, NULL); | |
445 | if (!hfs_inode_cachep) | |
446 | return -ENOMEM; | |
447 | err = register_filesystem(&hfs_fs_type); | |
448 | if (err) | |
449 | kmem_cache_destroy(hfs_inode_cachep); | |
450 | return err; | |
451 | } | |
452 | ||
453 | static void __exit exit_hfs_fs(void) | |
454 | { | |
455 | unregister_filesystem(&hfs_fs_type); | |
456 | if (kmem_cache_destroy(hfs_inode_cachep)) | |
457 | printk(KERN_INFO "hfs_inode_cache: not all structures were freed\n"); | |
458 | } | |
459 | ||
460 | module_init(init_hfs_fs) | |
461 | module_exit(exit_hfs_fs) |