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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/slab.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 | if (sb->s_dirt) |
82 | hfs_write_super(sb); |
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 | */ |
97 | static int hfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
98 | { |
99 | struct super_block *sb = dentry->d_sb; |
100 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
101 | |
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; |
109 | buf->f_fsid.val[0] = (u32)id; |
110 | buf->f_fsid.val[1] = (u32)(id >> 32); |
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))) { |
123 | printk(KERN_WARNING "hfs: filesystem was not cleanly unmounted, " |
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)) { |
128 | printk(KERN_WARNING "hfs: filesystem is marked locked, leaving read-only.\n"); |
129 | sb->s_flags |= MS_RDONLY; |
130 | *flags |= MS_RDONLY; |
131 | } |
132 | } |
133 | return 0; |
134 | } |
135 | |
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); |
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); |
157 | if (sbi->s_quiet) |
158 | seq_printf(seq, ",quiet"); |
159 | return 0; |
160 | } |
161 | |
162 | static struct inode *hfs_alloc_inode(struct super_block *sb) |
163 | { |
164 | struct hfs_inode_info *i; |
165 | |
166 | i = kmem_cache_alloc(hfs_inode_cachep, GFP_KERNEL); |
167 | return i ? &i->vfs_inode : NULL; |
168 | } |
169 | |
170 | static void hfs_i_callback(struct rcu_head *head) |
171 | { |
172 | struct inode *inode = container_of(head, struct inode, i_rcu); |
173 | INIT_LIST_HEAD(&inode->i_dentry); |
174 | kmem_cache_free(hfs_inode_cachep, HFS_I(inode)); |
175 | } |
176 | |
177 | static void hfs_destroy_inode(struct inode *inode) |
178 | { |
179 | call_rcu(&inode->i_rcu, hfs_i_callback); |
180 | } |
181 | |
182 | static const struct super_operations hfs_super_operations = { |
183 | .alloc_inode = hfs_alloc_inode, |
184 | .destroy_inode = hfs_destroy_inode, |
185 | .write_inode = hfs_write_inode, |
186 | .evict_inode = hfs_evict_inode, |
187 | .put_super = hfs_put_super, |
188 | .write_super = hfs_write_super, |
189 | .sync_fs = hfs_sync_fs, |
190 | .statfs = hfs_statfs, |
191 | .remount_fs = hfs_remount, |
192 | .show_options = hfs_show_options, |
193 | }; |
194 | |
195 | enum { |
196 | opt_uid, opt_gid, opt_umask, opt_file_umask, opt_dir_umask, |
197 | opt_part, opt_session, opt_type, opt_creator, opt_quiet, |
198 | opt_codepage, opt_iocharset, |
199 | opt_err |
200 | }; |
201 | |
202 | static const match_table_t tokens = { |
203 | { opt_uid, "uid=%u" }, |
204 | { opt_gid, "gid=%u" }, |
205 | { opt_umask, "umask=%o" }, |
206 | { opt_file_umask, "file_umask=%o" }, |
207 | { opt_dir_umask, "dir_umask=%o" }, |
208 | { opt_part, "part=%u" }, |
209 | { opt_session, "session=%u" }, |
210 | { opt_type, "type=%s" }, |
211 | { opt_creator, "creator=%s" }, |
212 | { opt_quiet, "quiet" }, |
213 | { opt_codepage, "codepage=%s" }, |
214 | { opt_iocharset, "iocharset=%s" }, |
215 | { opt_err, NULL } |
216 | }; |
217 | |
218 | static inline int match_fourchar(substring_t *arg, u32 *result) |
219 | { |
220 | if (arg->to - arg->from != 4) |
221 | return -EINVAL; |
222 | memcpy(result, arg->from, 4); |
223 | return 0; |
224 | } |
225 | |
226 | /* |
227 | * parse_options() |
228 | * |
229 | * adapted from linux/fs/msdos/inode.c written 1992,93 by Werner Almesberger |
230 | * This function is called by hfs_read_super() to parse the mount options. |
231 | */ |
232 | static int parse_options(char *options, struct hfs_sb_info *hsb) |
233 | { |
234 | char *p; |
235 | substring_t args[MAX_OPT_ARGS]; |
236 | int tmp, token; |
237 | |
238 | /* initialize the sb with defaults */ |
239 | hsb->s_uid = current_uid(); |
240 | hsb->s_gid = current_gid(); |
241 | hsb->s_file_umask = 0133; |
242 | hsb->s_dir_umask = 0022; |
243 | hsb->s_type = hsb->s_creator = cpu_to_be32(0x3f3f3f3f); /* == '????' */ |
244 | hsb->s_quiet = 0; |
245 | hsb->part = -1; |
246 | hsb->session = -1; |
247 | |
248 | if (!options) |
249 | return 1; |
250 | |
251 | while ((p = strsep(&options, ",")) != NULL) { |
252 | if (!*p) |
253 | continue; |
254 | |
255 | token = match_token(p, tokens, args); |
256 | switch (token) { |
257 | case opt_uid: |
258 | if (match_int(&args[0], &tmp)) { |
259 | printk(KERN_ERR "hfs: uid requires an argument\n"); |
260 | return 0; |
261 | } |
262 | hsb->s_uid = (uid_t)tmp; |
263 | break; |
264 | case opt_gid: |
265 | if (match_int(&args[0], &tmp)) { |
266 | printk(KERN_ERR "hfs: gid requires an argument\n"); |
267 | return 0; |
268 | } |
269 | hsb->s_gid = (gid_t)tmp; |
270 | break; |
271 | case opt_umask: |
272 | if (match_octal(&args[0], &tmp)) { |
273 | printk(KERN_ERR "hfs: umask requires a value\n"); |
274 | return 0; |
275 | } |
276 | hsb->s_file_umask = (umode_t)tmp; |
277 | hsb->s_dir_umask = (umode_t)tmp; |
278 | break; |
279 | case opt_file_umask: |
280 | if (match_octal(&args[0], &tmp)) { |
281 | printk(KERN_ERR "hfs: file_umask requires a value\n"); |
282 | return 0; |
283 | } |
284 | hsb->s_file_umask = (umode_t)tmp; |
285 | break; |
286 | case opt_dir_umask: |
287 | if (match_octal(&args[0], &tmp)) { |
288 | printk(KERN_ERR "hfs: dir_umask requires a value\n"); |
289 | return 0; |
290 | } |
291 | hsb->s_dir_umask = (umode_t)tmp; |
292 | break; |
293 | case opt_part: |
294 | if (match_int(&args[0], &hsb->part)) { |
295 | printk(KERN_ERR "hfs: part requires an argument\n"); |
296 | return 0; |
297 | } |
298 | break; |
299 | case opt_session: |
300 | if (match_int(&args[0], &hsb->session)) { |
301 | printk(KERN_ERR "hfs: session requires an argument\n"); |
302 | return 0; |
303 | } |
304 | break; |
305 | case opt_type: |
306 | if (match_fourchar(&args[0], &hsb->s_type)) { |
307 | printk(KERN_ERR "hfs: type requires a 4 character value\n"); |
308 | return 0; |
309 | } |
310 | break; |
311 | case opt_creator: |
312 | if (match_fourchar(&args[0], &hsb->s_creator)) { |
313 | printk(KERN_ERR "hfs: creator requires a 4 character value\n"); |
314 | return 0; |
315 | } |
316 | break; |
317 | case opt_quiet: |
318 | hsb->s_quiet = 1; |
319 | break; |
320 | case opt_codepage: |
321 | if (hsb->nls_disk) { |
322 | printk(KERN_ERR "hfs: unable to change codepage\n"); |
323 | return 0; |
324 | } |
325 | p = match_strdup(&args[0]); |
326 | if (p) |
327 | hsb->nls_disk = load_nls(p); |
328 | if (!hsb->nls_disk) { |
329 | printk(KERN_ERR "hfs: unable to load codepage \"%s\"\n", p); |
330 | kfree(p); |
331 | return 0; |
332 | } |
333 | kfree(p); |
334 | break; |
335 | case opt_iocharset: |
336 | if (hsb->nls_io) { |
337 | printk(KERN_ERR "hfs: unable to change iocharset\n"); |
338 | return 0; |
339 | } |
340 | p = match_strdup(&args[0]); |
341 | if (p) |
342 | hsb->nls_io = load_nls(p); |
343 | if (!hsb->nls_io) { |
344 | printk(KERN_ERR "hfs: unable to load iocharset \"%s\"\n", p); |
345 | kfree(p); |
346 | return 0; |
347 | } |
348 | kfree(p); |
349 | break; |
350 | default: |
351 | return 0; |
352 | } |
353 | } |
354 | |
355 | if (hsb->nls_disk && !hsb->nls_io) { |
356 | hsb->nls_io = load_nls_default(); |
357 | if (!hsb->nls_io) { |
358 | printk(KERN_ERR "hfs: unable to load default iocharset\n"); |
359 | return 0; |
360 | } |
361 | } |
362 | hsb->s_dir_umask &= 0777; |
363 | hsb->s_file_umask &= 0577; |
364 | |
365 | return 1; |
366 | } |
367 | |
368 | /* |
369 | * hfs_read_super() |
370 | * |
371 | * This is the function that is responsible for mounting an HFS |
372 | * filesystem. It performs all the tasks necessary to get enough data |
373 | * from the disk to read the root inode. This includes parsing the |
374 | * mount options, dealing with Macintosh partitions, reading the |
375 | * superblock and the allocation bitmap blocks, calling |
376 | * hfs_btree_init() to get the necessary data about the extents and |
377 | * catalog B-trees and, finally, reading the root inode into memory. |
378 | */ |
379 | static int hfs_fill_super(struct super_block *sb, void *data, int silent) |
380 | { |
381 | struct hfs_sb_info *sbi; |
382 | struct hfs_find_data fd; |
383 | hfs_cat_rec rec; |
384 | struct inode *root_inode; |
385 | int res; |
386 | |
387 | sbi = kzalloc(sizeof(struct hfs_sb_info), GFP_KERNEL); |
388 | if (!sbi) |
389 | return -ENOMEM; |
390 | |
391 | sb->s_fs_info = sbi; |
392 | |
393 | res = -EINVAL; |
394 | if (!parse_options((char *)data, sbi)) { |
395 | printk(KERN_ERR "hfs: unable to parse mount options.\n"); |
396 | goto bail; |
397 | } |
398 | |
399 | sb->s_op = &hfs_super_operations; |
400 | sb->s_flags |= MS_NODIRATIME; |
401 | mutex_init(&sbi->bitmap_lock); |
402 | |
403 | res = hfs_mdb_get(sb); |
404 | if (res) { |
405 | if (!silent) |
406 | printk(KERN_WARNING "hfs: can't find a HFS filesystem on dev %s.\n", |
407 | hfs_mdb_name(sb)); |
408 | res = -EINVAL; |
409 | goto bail; |
410 | } |
411 | |
412 | /* try to get the root inode */ |
413 | hfs_find_init(HFS_SB(sb)->cat_tree, &fd); |
414 | res = hfs_cat_find_brec(sb, HFS_ROOT_CNID, &fd); |
415 | if (!res) { |
416 | if (fd.entrylength > sizeof(rec) || fd.entrylength < 0) { |
417 | res = -EIO; |
418 | goto bail; |
419 | } |
420 | hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, fd.entrylength); |
421 | } |
422 | if (res) { |
423 | hfs_find_exit(&fd); |
424 | goto bail_no_root; |
425 | } |
426 | res = -EINVAL; |
427 | root_inode = hfs_iget(sb, &fd.search_key->cat, &rec); |
428 | hfs_find_exit(&fd); |
429 | if (!root_inode) |
430 | goto bail_no_root; |
431 | |
432 | sb->s_d_op = &hfs_dentry_operations; |
433 | res = -ENOMEM; |
434 | sb->s_root = d_alloc_root(root_inode); |
435 | if (!sb->s_root) |
436 | goto bail_iput; |
437 | |
438 | /* everything's okay */ |
439 | return 0; |
440 | |
441 | bail_iput: |
442 | iput(root_inode); |
443 | bail_no_root: |
444 | printk(KERN_ERR "hfs: get root inode failed.\n"); |
445 | bail: |
446 | hfs_mdb_put(sb); |
447 | return res; |
448 | } |
449 | |
450 | static struct dentry *hfs_mount(struct file_system_type *fs_type, |
451 | int flags, const char *dev_name, void *data) |
452 | { |
453 | return mount_bdev(fs_type, flags, dev_name, data, hfs_fill_super); |
454 | } |
455 | |
456 | static struct file_system_type hfs_fs_type = { |
457 | .owner = THIS_MODULE, |
458 | .name = "hfs", |
459 | .mount = hfs_mount, |
460 | .kill_sb = kill_block_super, |
461 | .fs_flags = FS_REQUIRES_DEV, |
462 | }; |
463 | |
464 | static void hfs_init_once(void *p) |
465 | { |
466 | struct hfs_inode_info *i = p; |
467 | |
468 | inode_init_once(&i->vfs_inode); |
469 | } |
470 | |
471 | static int __init init_hfs_fs(void) |
472 | { |
473 | int err; |
474 | |
475 | hfs_inode_cachep = kmem_cache_create("hfs_inode_cache", |
476 | sizeof(struct hfs_inode_info), 0, SLAB_HWCACHE_ALIGN, |
477 | hfs_init_once); |
478 | if (!hfs_inode_cachep) |
479 | return -ENOMEM; |
480 | err = register_filesystem(&hfs_fs_type); |
481 | if (err) |
482 | kmem_cache_destroy(hfs_inode_cachep); |
483 | return err; |
484 | } |
485 | |
486 | static void __exit exit_hfs_fs(void) |
487 | { |
488 | unregister_filesystem(&hfs_fs_type); |
489 | kmem_cache_destroy(hfs_inode_cachep); |
490 | } |
491 | |
492 | module_init(init_hfs_fs) |
493 | module_exit(exit_hfs_fs) |
494 |
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