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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/vfs.h>
23
24 #include "hfs_fs.h"
25 #include "btree.h"
26
27 static struct kmem_cache *hfs_inode_cachep;
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 */
82 static int hfs_statfs(struct dentry *dentry, struct kstatfs *buf)
83 {
84 struct super_block *sb = dentry->d_sb;
85 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
86
87 buf->f_type = HFS_SUPER_MAGIC;
88 buf->f_bsize = sb->s_blocksize;
89 buf->f_blocks = (u32)HFS_SB(sb)->fs_ablocks * HFS_SB(sb)->fs_div;
90 buf->f_bfree = (u32)HFS_SB(sb)->free_ablocks * HFS_SB(sb)->fs_div;
91 buf->f_bavail = buf->f_bfree;
92 buf->f_files = HFS_SB(sb)->fs_ablocks;
93 buf->f_ffree = HFS_SB(sb)->free_ablocks;
94 buf->f_fsid.val[0] = (u32)id;
95 buf->f_fsid.val[1] = (u32)(id >> 32);
96 buf->f_namelen = HFS_NAMELEN;
97
98 return 0;
99 }
100
101 static int hfs_remount(struct super_block *sb, int *flags, char *data)
102 {
103 *flags |= MS_NODIRATIME;
104 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
105 return 0;
106 if (!(*flags & MS_RDONLY)) {
107 if (!(HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_UNMNT))) {
108 printk(KERN_WARNING "hfs: filesystem was not cleanly unmounted, "
109 "running fsck.hfs is recommended. leaving read-only.\n");
110 sb->s_flags |= MS_RDONLY;
111 *flags |= MS_RDONLY;
112 } else if (HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_SLOCK)) {
113 printk(KERN_WARNING "hfs: filesystem is marked locked, leaving read-only.\n");
114 sb->s_flags |= MS_RDONLY;
115 *flags |= MS_RDONLY;
116 }
117 }
118 return 0;
119 }
120
121 static int hfs_show_options(struct seq_file *seq, struct vfsmount *mnt)
122 {
123 struct hfs_sb_info *sbi = HFS_SB(mnt->mnt_sb);
124
125 if (sbi->s_creator != cpu_to_be32(0x3f3f3f3f))
126 seq_printf(seq, ",creator=%.4s", (char *)&sbi->s_creator);
127 if (sbi->s_type != cpu_to_be32(0x3f3f3f3f))
128 seq_printf(seq, ",type=%.4s", (char *)&sbi->s_type);
129 seq_printf(seq, ",uid=%u,gid=%u", sbi->s_uid, sbi->s_gid);
130 if (sbi->s_file_umask != 0133)
131 seq_printf(seq, ",file_umask=%o", sbi->s_file_umask);
132 if (sbi->s_dir_umask != 0022)
133 seq_printf(seq, ",dir_umask=%o", sbi->s_dir_umask);
134 if (sbi->part >= 0)
135 seq_printf(seq, ",part=%u", sbi->part);
136 if (sbi->session >= 0)
137 seq_printf(seq, ",session=%u", sbi->session);
138 if (sbi->nls_disk)
139 seq_printf(seq, ",codepage=%s", sbi->nls_disk->charset);
140 if (sbi->nls_io)
141 seq_printf(seq, ",iocharset=%s", sbi->nls_io->charset);
142 if (sbi->s_quiet)
143 seq_printf(seq, ",quiet");
144 return 0;
145 }
146
147 static struct inode *hfs_alloc_inode(struct super_block *sb)
148 {
149 struct hfs_inode_info *i;
150
151 i = kmem_cache_alloc(hfs_inode_cachep, GFP_KERNEL);
152 return i ? &i->vfs_inode : NULL;
153 }
154
155 static void hfs_destroy_inode(struct inode *inode)
156 {
157 kmem_cache_free(hfs_inode_cachep, HFS_I(inode));
158 }
159
160 static const struct super_operations hfs_super_operations = {
161 .alloc_inode = hfs_alloc_inode,
162 .destroy_inode = hfs_destroy_inode,
163 .write_inode = hfs_write_inode,
164 .clear_inode = hfs_clear_inode,
165 .put_super = hfs_put_super,
166 .write_super = hfs_write_super,
167 .statfs = hfs_statfs,
168 .remount_fs = hfs_remount,
169 .show_options = hfs_show_options,
170 };
171
172 enum {
173 opt_uid, opt_gid, opt_umask, opt_file_umask, opt_dir_umask,
174 opt_part, opt_session, opt_type, opt_creator, opt_quiet,
175 opt_codepage, opt_iocharset,
176 opt_err
177 };
178
179 static const match_table_t tokens = {
180 { opt_uid, "uid=%u" },
181 { opt_gid, "gid=%u" },
182 { opt_umask, "umask=%o" },
183 { opt_file_umask, "file_umask=%o" },
184 { opt_dir_umask, "dir_umask=%o" },
185 { opt_part, "part=%u" },
186 { opt_session, "session=%u" },
187 { opt_type, "type=%s" },
188 { opt_creator, "creator=%s" },
189 { opt_quiet, "quiet" },
190 { opt_codepage, "codepage=%s" },
191 { opt_iocharset, "iocharset=%s" },
192 { opt_err, NULL }
193 };
194
195 static inline int match_fourchar(substring_t *arg, u32 *result)
196 {
197 if (arg->to - arg->from != 4)
198 return -EINVAL;
199 memcpy(result, arg->from, 4);
200 return 0;
201 }
202
203 /*
204 * parse_options()
205 *
206 * adapted from linux/fs/msdos/inode.c written 1992,93 by Werner Almesberger
207 * This function is called by hfs_read_super() to parse the mount options.
208 */
209 static int parse_options(char *options, struct hfs_sb_info *hsb)
210 {
211 char *p;
212 substring_t args[MAX_OPT_ARGS];
213 int tmp, token;
214
215 /* initialize the sb with defaults */
216 hsb->s_uid = current_uid();
217 hsb->s_gid = current_gid();
218 hsb->s_file_umask = 0133;
219 hsb->s_dir_umask = 0022;
220 hsb->s_type = hsb->s_creator = cpu_to_be32(0x3f3f3f3f); /* == '????' */
221 hsb->s_quiet = 0;
222 hsb->part = -1;
223 hsb->session = -1;
224
225 if (!options)
226 return 1;
227
228 while ((p = strsep(&options, ",")) != NULL) {
229 if (!*p)
230 continue;
231
232 token = match_token(p, tokens, args);
233 switch (token) {
234 case opt_uid:
235 if (match_int(&args[0], &tmp)) {
236 printk(KERN_ERR "hfs: uid requires an argument\n");
237 return 0;
238 }
239 hsb->s_uid = (uid_t)tmp;
240 break;
241 case opt_gid:
242 if (match_int(&args[0], &tmp)) {
243 printk(KERN_ERR "hfs: gid requires an argument\n");
244 return 0;
245 }
246 hsb->s_gid = (gid_t)tmp;
247 break;
248 case opt_umask:
249 if (match_octal(&args[0], &tmp)) {
250 printk(KERN_ERR "hfs: umask requires a value\n");
251 return 0;
252 }
253 hsb->s_file_umask = (umode_t)tmp;
254 hsb->s_dir_umask = (umode_t)tmp;
255 break;
256 case opt_file_umask:
257 if (match_octal(&args[0], &tmp)) {
258 printk(KERN_ERR "hfs: file_umask requires a value\n");
259 return 0;
260 }
261 hsb->s_file_umask = (umode_t)tmp;
262 break;
263 case opt_dir_umask:
264 if (match_octal(&args[0], &tmp)) {
265 printk(KERN_ERR "hfs: dir_umask requires a value\n");
266 return 0;
267 }
268 hsb->s_dir_umask = (umode_t)tmp;
269 break;
270 case opt_part:
271 if (match_int(&args[0], &hsb->part)) {
272 printk(KERN_ERR "hfs: part requires an argument\n");
273 return 0;
274 }
275 break;
276 case opt_session:
277 if (match_int(&args[0], &hsb->session)) {
278 printk(KERN_ERR "hfs: session requires an argument\n");
279 return 0;
280 }
281 break;
282 case opt_type:
283 if (match_fourchar(&args[0], &hsb->s_type)) {
284 printk(KERN_ERR "hfs: type requires a 4 character value\n");
285 return 0;
286 }
287 break;
288 case opt_creator:
289 if (match_fourchar(&args[0], &hsb->s_creator)) {
290 printk(KERN_ERR "hfs: creator requires a 4 character value\n");
291 return 0;
292 }
293 break;
294 case opt_quiet:
295 hsb->s_quiet = 1;
296 break;
297 case opt_codepage:
298 if (hsb->nls_disk) {
299 printk(KERN_ERR "hfs: unable to change codepage\n");
300 return 0;
301 }
302 p = match_strdup(&args[0]);
303 if (p)
304 hsb->nls_disk = load_nls(p);
305 if (!hsb->nls_disk) {
306 printk(KERN_ERR "hfs: unable to load codepage \"%s\"\n", p);
307 kfree(p);
308 return 0;
309 }
310 kfree(p);
311 break;
312 case opt_iocharset:
313 if (hsb->nls_io) {
314 printk(KERN_ERR "hfs: unable to change iocharset\n");
315 return 0;
316 }
317 p = match_strdup(&args[0]);
318 if (p)
319 hsb->nls_io = load_nls(p);
320 if (!hsb->nls_io) {
321 printk(KERN_ERR "hfs: unable to load iocharset \"%s\"\n", p);
322 kfree(p);
323 return 0;
324 }
325 kfree(p);
326 break;
327 default:
328 return 0;
329 }
330 }
331
332 if (hsb->nls_disk && !hsb->nls_io) {
333 hsb->nls_io = load_nls_default();
334 if (!hsb->nls_io) {
335 printk(KERN_ERR "hfs: unable to load default iocharset\n");
336 return 0;
337 }
338 }
339 hsb->s_dir_umask &= 0777;
340 hsb->s_file_umask &= 0577;
341
342 return 1;
343 }
344
345 /*
346 * hfs_read_super()
347 *
348 * This is the function that is responsible for mounting an HFS
349 * filesystem. It performs all the tasks necessary to get enough data
350 * from the disk to read the root inode. This includes parsing the
351 * mount options, dealing with Macintosh partitions, reading the
352 * superblock and the allocation bitmap blocks, calling
353 * hfs_btree_init() to get the necessary data about the extents and
354 * catalog B-trees and, finally, reading the root inode into memory.
355 */
356 static int hfs_fill_super(struct super_block *sb, void *data, int silent)
357 {
358 struct hfs_sb_info *sbi;
359 struct hfs_find_data fd;
360 hfs_cat_rec rec;
361 struct inode *root_inode;
362 int res;
363
364 sbi = kzalloc(sizeof(struct hfs_sb_info), GFP_KERNEL);
365 if (!sbi)
366 return -ENOMEM;
367 sb->s_fs_info = sbi;
368 INIT_HLIST_HEAD(&sbi->rsrc_inodes);
369
370 res = -EINVAL;
371 if (!parse_options((char *)data, sbi)) {
372 printk(KERN_ERR "hfs: unable to parse mount options.\n");
373 goto bail;
374 }
375
376 sb->s_op = &hfs_super_operations;
377 sb->s_flags |= MS_NODIRATIME;
378 mutex_init(&sbi->bitmap_lock);
379
380 res = hfs_mdb_get(sb);
381 if (res) {
382 if (!silent)
383 printk(KERN_WARNING "hfs: can't find a HFS filesystem on dev %s.\n",
384 hfs_mdb_name(sb));
385 res = -EINVAL;
386 goto bail;
387 }
388
389 /* try to get the root inode */
390 hfs_find_init(HFS_SB(sb)->cat_tree, &fd);
391 res = hfs_cat_find_brec(sb, HFS_ROOT_CNID, &fd);
392 if (!res)
393 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, fd.entrylength);
394 if (res) {
395 hfs_find_exit(&fd);
396 goto bail_no_root;
397 }
398 res = -EINVAL;
399 root_inode = hfs_iget(sb, &fd.search_key->cat, &rec);
400 hfs_find_exit(&fd);
401 if (!root_inode)
402 goto bail_no_root;
403
404 res = -ENOMEM;
405 sb->s_root = d_alloc_root(root_inode);
406 if (!sb->s_root)
407 goto bail_iput;
408
409 sb->s_root->d_op = &hfs_dentry_operations;
410
411 /* everything's okay */
412 return 0;
413
414 bail_iput:
415 iput(root_inode);
416 bail_no_root:
417 printk(KERN_ERR "hfs: get root inode failed.\n");
418 bail:
419 hfs_mdb_put(sb);
420 return res;
421 }
422
423 static int hfs_get_sb(struct file_system_type *fs_type,
424 int flags, const char *dev_name, void *data,
425 struct vfsmount *mnt)
426 {
427 return get_sb_bdev(fs_type, flags, dev_name, data, hfs_fill_super, mnt);
428 }
429
430 static struct file_system_type hfs_fs_type = {
431 .owner = THIS_MODULE,
432 .name = "hfs",
433 .get_sb = hfs_get_sb,
434 .kill_sb = kill_block_super,
435 .fs_flags = FS_REQUIRES_DEV,
436 };
437
438 static void hfs_init_once(void *p)
439 {
440 struct hfs_inode_info *i = p;
441
442 inode_init_once(&i->vfs_inode);
443 }
444
445 static int __init init_hfs_fs(void)
446 {
447 int err;
448
449 hfs_inode_cachep = kmem_cache_create("hfs_inode_cache",
450 sizeof(struct hfs_inode_info), 0, SLAB_HWCACHE_ALIGN,
451 hfs_init_once);
452 if (!hfs_inode_cachep)
453 return -ENOMEM;
454 err = register_filesystem(&hfs_fs_type);
455 if (err)
456 kmem_cache_destroy(hfs_inode_cachep);
457 return err;
458 }
459
460 static void __exit exit_hfs_fs(void)
461 {
462 unregister_filesystem(&hfs_fs_type);
463 kmem_cache_destroy(hfs_inode_cachep);
464 }
465
466 module_init(init_hfs_fs)
467 module_exit(exit_hfs_fs)