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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_hfs_fs() and exit_hfs_fs(). 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/module.h> |
16 | #include <linux/blkdev.h> |
17 | #include <linux/mount.h> |
18 | #include <linux/init.h> |
19 | #include <linux/nls.h> |
20 | #include <linux/parser.h> |
21 | #include <linux/seq_file.h> |
22 | #include <linux/smp_lock.h> |
23 | #include <linux/vfs.h> |
24 | |
25 | #include "hfs_fs.h" |
26 | #include "btree.h" |
27 | |
28 | static struct kmem_cache *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 | lock_super(sb); |
54 | sb->s_dirt = 0; |
55 | |
56 | /* sync everything to the buffers */ |
57 | if (!(sb->s_flags & MS_RDONLY)) |
58 | hfs_mdb_commit(sb); |
59 | unlock_super(sb); |
60 | } |
61 | |
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 | |
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 | { |
81 | lock_kernel(); |
82 | |
83 | if (sb->s_dirt) |
84 | hfs_write_super(sb); |
85 | hfs_mdb_close(sb); |
86 | /* release the MDB's resources */ |
87 | hfs_mdb_put(sb); |
88 | |
89 | unlock_kernel(); |
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 | */ |
101 | static int hfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
102 | { |
103 | struct super_block *sb = dentry->d_sb; |
104 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
105 | |
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; |
113 | buf->f_fsid.val[0] = (u32)id; |
114 | buf->f_fsid.val[1] = (u32)(id >> 32); |
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))) { |
127 | printk(KERN_WARNING "hfs: filesystem was not cleanly unmounted, " |
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)) { |
132 | printk(KERN_WARNING "hfs: filesystem is marked locked, leaving read-only.\n"); |
133 | sb->s_flags |= MS_RDONLY; |
134 | *flags |= MS_RDONLY; |
135 | } |
136 | } |
137 | return 0; |
138 | } |
139 | |
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); |
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); |
161 | if (sbi->s_quiet) |
162 | seq_printf(seq, ",quiet"); |
163 | return 0; |
164 | } |
165 | |
166 | static struct inode *hfs_alloc_inode(struct super_block *sb) |
167 | { |
168 | struct hfs_inode_info *i; |
169 | |
170 | i = kmem_cache_alloc(hfs_inode_cachep, GFP_KERNEL); |
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 | |
179 | static const struct super_operations hfs_super_operations = { |
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, |
186 | .sync_fs = hfs_sync_fs, |
187 | .statfs = hfs_statfs, |
188 | .remount_fs = hfs_remount, |
189 | .show_options = hfs_show_options, |
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, |
195 | opt_codepage, opt_iocharset, |
196 | opt_err |
197 | }; |
198 | |
199 | static const match_table_t tokens = { |
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" }, |
210 | { opt_codepage, "codepage=%s" }, |
211 | { opt_iocharset, "iocharset=%s" }, |
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 */ |
236 | hsb->s_uid = current_uid(); |
237 | hsb->s_gid = current_gid(); |
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)) { |
256 | printk(KERN_ERR "hfs: uid requires an argument\n"); |
257 | return 0; |
258 | } |
259 | hsb->s_uid = (uid_t)tmp; |
260 | break; |
261 | case opt_gid: |
262 | if (match_int(&args[0], &tmp)) { |
263 | printk(KERN_ERR "hfs: gid requires an argument\n"); |
264 | return 0; |
265 | } |
266 | hsb->s_gid = (gid_t)tmp; |
267 | break; |
268 | case opt_umask: |
269 | if (match_octal(&args[0], &tmp)) { |
270 | printk(KERN_ERR "hfs: umask requires a value\n"); |
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)) { |
278 | printk(KERN_ERR "hfs: file_umask requires a value\n"); |
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)) { |
285 | printk(KERN_ERR "hfs: dir_umask requires a value\n"); |
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)) { |
292 | printk(KERN_ERR "hfs: part requires an argument\n"); |
293 | return 0; |
294 | } |
295 | break; |
296 | case opt_session: |
297 | if (match_int(&args[0], &hsb->session)) { |
298 | printk(KERN_ERR "hfs: session requires an argument\n"); |
299 | return 0; |
300 | } |
301 | break; |
302 | case opt_type: |
303 | if (match_fourchar(&args[0], &hsb->s_type)) { |
304 | printk(KERN_ERR "hfs: type requires a 4 character value\n"); |
305 | return 0; |
306 | } |
307 | break; |
308 | case opt_creator: |
309 | if (match_fourchar(&args[0], &hsb->s_creator)) { |
310 | printk(KERN_ERR "hfs: creator requires a 4 character value\n"); |
311 | return 0; |
312 | } |
313 | break; |
314 | case opt_quiet: |
315 | hsb->s_quiet = 1; |
316 | break; |
317 | case opt_codepage: |
318 | if (hsb->nls_disk) { |
319 | printk(KERN_ERR "hfs: unable to change codepage\n"); |
320 | return 0; |
321 | } |
322 | p = match_strdup(&args[0]); |
323 | if (p) |
324 | hsb->nls_disk = load_nls(p); |
325 | if (!hsb->nls_disk) { |
326 | printk(KERN_ERR "hfs: unable to load codepage \"%s\"\n", p); |
327 | kfree(p); |
328 | return 0; |
329 | } |
330 | kfree(p); |
331 | break; |
332 | case opt_iocharset: |
333 | if (hsb->nls_io) { |
334 | printk(KERN_ERR "hfs: unable to change iocharset\n"); |
335 | return 0; |
336 | } |
337 | p = match_strdup(&args[0]); |
338 | if (p) |
339 | hsb->nls_io = load_nls(p); |
340 | if (!hsb->nls_io) { |
341 | printk(KERN_ERR "hfs: unable to load iocharset \"%s\"\n", p); |
342 | kfree(p); |
343 | return 0; |
344 | } |
345 | kfree(p); |
346 | break; |
347 | default: |
348 | return 0; |
349 | } |
350 | } |
351 | |
352 | if (hsb->nls_disk && !hsb->nls_io) { |
353 | hsb->nls_io = load_nls_default(); |
354 | if (!hsb->nls_io) { |
355 | printk(KERN_ERR "hfs: unable to load default iocharset\n"); |
356 | return 0; |
357 | } |
358 | } |
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 | |
384 | sbi = kzalloc(sizeof(struct hfs_sb_info), GFP_KERNEL); |
385 | if (!sbi) |
386 | return -ENOMEM; |
387 | sb->s_fs_info = sbi; |
388 | INIT_HLIST_HEAD(&sbi->rsrc_inodes); |
389 | |
390 | res = -EINVAL; |
391 | if (!parse_options((char *)data, sbi)) { |
392 | printk(KERN_ERR "hfs: unable to parse mount options.\n"); |
393 | goto bail; |
394 | } |
395 | |
396 | sb->s_op = &hfs_super_operations; |
397 | sb->s_flags |= MS_NODIRATIME; |
398 | mutex_init(&sbi->bitmap_lock); |
399 | |
400 | res = hfs_mdb_get(sb); |
401 | if (res) { |
402 | if (!silent) |
403 | printk(KERN_WARNING "hfs: can't find a HFS filesystem on dev %s.\n", |
404 | hfs_mdb_name(sb)); |
405 | res = -EINVAL; |
406 | goto bail; |
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 | } |
418 | res = -EINVAL; |
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 | |
424 | res = -ENOMEM; |
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: |
437 | printk(KERN_ERR "hfs: get root inode failed.\n"); |
438 | bail: |
439 | hfs_mdb_put(sb); |
440 | return res; |
441 | } |
442 | |
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) |
446 | { |
447 | return get_sb_bdev(fs_type, flags, dev_name, data, hfs_fill_super, mnt); |
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 | |
458 | static void hfs_init_once(void *p) |
459 | { |
460 | struct hfs_inode_info *i = p; |
461 | |
462 | inode_init_once(&i->vfs_inode); |
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, |
471 | hfs_init_once); |
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); |
483 | kmem_cache_destroy(hfs_inode_cachep); |
484 | } |
485 | |
486 | module_init(init_hfs_fs) |
487 | module_exit(exit_hfs_fs) |
488 |
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