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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
28static struct kmem_cache *hfs_inode_cachep;
29
30MODULE_LICENSE("GPL");
31
32static int hfs_sync_fs(struct super_block *sb, int wait)
33{
34 hfs_mdb_commit(sb);
35 return 0;
36}
37
38
39
40
41
42
43
44
45static void hfs_put_super(struct super_block *sb)
46{
47 cancel_delayed_work_sync(&HFS_SB(sb)->mdb_work);
48 hfs_mdb_close(sb);
49
50 hfs_mdb_put(sb);
51}
52
53static void flush_mdb(struct work_struct *work)
54{
55 struct hfs_sb_info *sbi;
56 struct super_block *sb;
57
58 sbi = container_of(work, struct hfs_sb_info, mdb_work.work);
59 sb = sbi->sb;
60
61 spin_lock(&sbi->work_lock);
62 sbi->work_queued = 0;
63 spin_unlock(&sbi->work_lock);
64
65 hfs_mdb_commit(sb);
66}
67
68void hfs_mark_mdb_dirty(struct super_block *sb)
69{
70 struct hfs_sb_info *sbi = HFS_SB(sb);
71 unsigned long delay;
72
73 if (sb->s_flags & MS_RDONLY)
74 return;
75
76 spin_lock(&sbi->work_lock);
77 if (!sbi->work_queued) {
78 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
79 queue_delayed_work(system_long_wq, &sbi->mdb_work, delay);
80 sbi->work_queued = 1;
81 }
82 spin_unlock(&sbi->work_lock);
83}
84
85
86
87
88
89
90
91
92
93
94static int hfs_statfs(struct dentry *dentry, struct kstatfs *buf)
95{
96 struct super_block *sb = dentry->d_sb;
97 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
98
99 buf->f_type = HFS_SUPER_MAGIC;
100 buf->f_bsize = sb->s_blocksize;
101 buf->f_blocks = (u32)HFS_SB(sb)->fs_ablocks * HFS_SB(sb)->fs_div;
102 buf->f_bfree = (u32)HFS_SB(sb)->free_ablocks * HFS_SB(sb)->fs_div;
103 buf->f_bavail = buf->f_bfree;
104 buf->f_files = HFS_SB(sb)->fs_ablocks;
105 buf->f_ffree = HFS_SB(sb)->free_ablocks;
106 buf->f_fsid.val[0] = (u32)id;
107 buf->f_fsid.val[1] = (u32)(id >> 32);
108 buf->f_namelen = HFS_NAMELEN;
109
110 return 0;
111}
112
113static int hfs_remount(struct super_block *sb, int *flags, char *data)
114{
115 *flags |= MS_NODIRATIME;
116 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
117 return 0;
118 if (!(*flags & MS_RDONLY)) {
119 if (!(HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_UNMNT))) {
120 pr_warn("filesystem was not cleanly unmounted, running fsck.hfs is recommended. leaving read-only.\n");
121 sb->s_flags |= MS_RDONLY;
122 *flags |= MS_RDONLY;
123 } else if (HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_SLOCK)) {
124 pr_warn("filesystem is marked locked, leaving read-only.\n");
125 sb->s_flags |= MS_RDONLY;
126 *flags |= MS_RDONLY;
127 }
128 }
129 return 0;
130}
131
132static int hfs_show_options(struct seq_file *seq, struct dentry *root)
133{
134 struct hfs_sb_info *sbi = HFS_SB(root->d_sb);
135
136 if (sbi->s_creator != cpu_to_be32(0x3f3f3f3f))
137 seq_show_option_n(seq, "creator", (char *)&sbi->s_creator, 4);
138 if (sbi->s_type != cpu_to_be32(0x3f3f3f3f))
139 seq_show_option_n(seq, "type", (char *)&sbi->s_type, 4);
140 seq_printf(seq, ",uid=%u,gid=%u",
141 from_kuid_munged(&init_user_ns, sbi->s_uid),
142 from_kgid_munged(&init_user_ns, sbi->s_gid));
143 if (sbi->s_file_umask != 0133)
144 seq_printf(seq, ",file_umask=%o", sbi->s_file_umask);
145 if (sbi->s_dir_umask != 0022)
146 seq_printf(seq, ",dir_umask=%o", sbi->s_dir_umask);
147 if (sbi->part >= 0)
148 seq_printf(seq, ",part=%u", sbi->part);
149 if (sbi->session >= 0)
150 seq_printf(seq, ",session=%u", sbi->session);
151 if (sbi->nls_disk)
152 seq_printf(seq, ",codepage=%s", sbi->nls_disk->charset);
153 if (sbi->nls_io)
154 seq_printf(seq, ",iocharset=%s", sbi->nls_io->charset);
155 if (sbi->s_quiet)
156 seq_printf(seq, ",quiet");
157 return 0;
158}
159
160static struct inode *hfs_alloc_inode(struct super_block *sb)
161{
162 struct hfs_inode_info *i;
163
164 i = kmem_cache_alloc(hfs_inode_cachep, GFP_KERNEL);
165 return i ? &i->vfs_inode : NULL;
166}
167
168static void hfs_i_callback(struct rcu_head *head)
169{
170 struct inode *inode = container_of(head, struct inode, i_rcu);
171 kmem_cache_free(hfs_inode_cachep, HFS_I(inode));
172}
173
174static void hfs_destroy_inode(struct inode *inode)
175{
176 call_rcu(&inode->i_rcu, hfs_i_callback);
177}
178
179static 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 .evict_inode = hfs_evict_inode,
184 .put_super = hfs_put_super,
185 .sync_fs = hfs_sync_fs,
186 .statfs = hfs_statfs,
187 .remount_fs = hfs_remount,
188 .show_options = hfs_show_options,
189};
190
191enum {
192 opt_uid, opt_gid, opt_umask, opt_file_umask, opt_dir_umask,
193 opt_part, opt_session, opt_type, opt_creator, opt_quiet,
194 opt_codepage, opt_iocharset,
195 opt_err
196};
197
198static const match_table_t tokens = {
199 { opt_uid, "uid=%u" },
200 { opt_gid, "gid=%u" },
201 { opt_umask, "umask=%o" },
202 { opt_file_umask, "file_umask=%o" },
203 { opt_dir_umask, "dir_umask=%o" },
204 { opt_part, "part=%u" },
205 { opt_session, "session=%u" },
206 { opt_type, "type=%s" },
207 { opt_creator, "creator=%s" },
208 { opt_quiet, "quiet" },
209 { opt_codepage, "codepage=%s" },
210 { opt_iocharset, "iocharset=%s" },
211 { opt_err, NULL }
212};
213
214static inline int match_fourchar(substring_t *arg, u32 *result)
215{
216 if (arg->to - arg->from != 4)
217 return -EINVAL;
218 memcpy(result, arg->from, 4);
219 return 0;
220}
221
222
223
224
225
226
227
228static int parse_options(char *options, struct hfs_sb_info *hsb)
229{
230 char *p;
231 substring_t args[MAX_OPT_ARGS];
232 int tmp, token;
233
234
235 hsb->s_uid = current_uid();
236 hsb->s_gid = current_gid();
237 hsb->s_file_umask = 0133;
238 hsb->s_dir_umask = 0022;
239 hsb->s_type = hsb->s_creator = cpu_to_be32(0x3f3f3f3f);
240 hsb->s_quiet = 0;
241 hsb->part = -1;
242 hsb->session = -1;
243
244 if (!options)
245 return 1;
246
247 while ((p = strsep(&options, ",")) != NULL) {
248 if (!*p)
249 continue;
250
251 token = match_token(p, tokens, args);
252 switch (token) {
253 case opt_uid:
254 if (match_int(&args[0], &tmp)) {
255 pr_err("uid requires an argument\n");
256 return 0;
257 }
258 hsb->s_uid = make_kuid(current_user_ns(), (uid_t)tmp);
259 if (!uid_valid(hsb->s_uid)) {
260 pr_err("invalid uid %d\n", tmp);
261 return 0;
262 }
263 break;
264 case opt_gid:
265 if (match_int(&args[0], &tmp)) {
266 pr_err("gid requires an argument\n");
267 return 0;
268 }
269 hsb->s_gid = make_kgid(current_user_ns(), (gid_t)tmp);
270 if (!gid_valid(hsb->s_gid)) {
271 pr_err("invalid gid %d\n", tmp);
272 return 0;
273 }
274 break;
275 case opt_umask:
276 if (match_octal(&args[0], &tmp)) {
277 pr_err("umask requires a value\n");
278 return 0;
279 }
280 hsb->s_file_umask = (umode_t)tmp;
281 hsb->s_dir_umask = (umode_t)tmp;
282 break;
283 case opt_file_umask:
284 if (match_octal(&args[0], &tmp)) {
285 pr_err("file_umask requires a value\n");
286 return 0;
287 }
288 hsb->s_file_umask = (umode_t)tmp;
289 break;
290 case opt_dir_umask:
291 if (match_octal(&args[0], &tmp)) {
292 pr_err("dir_umask requires a value\n");
293 return 0;
294 }
295 hsb->s_dir_umask = (umode_t)tmp;
296 break;
297 case opt_part:
298 if (match_int(&args[0], &hsb->part)) {
299 pr_err("part requires an argument\n");
300 return 0;
301 }
302 break;
303 case opt_session:
304 if (match_int(&args[0], &hsb->session)) {
305 pr_err("session requires an argument\n");
306 return 0;
307 }
308 break;
309 case opt_type:
310 if (match_fourchar(&args[0], &hsb->s_type)) {
311 pr_err("type requires a 4 character value\n");
312 return 0;
313 }
314 break;
315 case opt_creator:
316 if (match_fourchar(&args[0], &hsb->s_creator)) {
317 pr_err("creator requires a 4 character value\n");
318 return 0;
319 }
320 break;
321 case opt_quiet:
322 hsb->s_quiet = 1;
323 break;
324 case opt_codepage:
325 if (hsb->nls_disk) {
326 pr_err("unable to change codepage\n");
327 return 0;
328 }
329 p = match_strdup(&args[0]);
330 if (p)
331 hsb->nls_disk = load_nls(p);
332 if (!hsb->nls_disk) {
333 pr_err("unable to load codepage \"%s\"\n", p);
334 kfree(p);
335 return 0;
336 }
337 kfree(p);
338 break;
339 case opt_iocharset:
340 if (hsb->nls_io) {
341 pr_err("unable to change iocharset\n");
342 return 0;
343 }
344 p = match_strdup(&args[0]);
345 if (p)
346 hsb->nls_io = load_nls(p);
347 if (!hsb->nls_io) {
348 pr_err("unable to load iocharset \"%s\"\n", p);
349 kfree(p);
350 return 0;
351 }
352 kfree(p);
353 break;
354 default:
355 return 0;
356 }
357 }
358
359 if (hsb->nls_disk && !hsb->nls_io) {
360 hsb->nls_io = load_nls_default();
361 if (!hsb->nls_io) {
362 pr_err("unable to load default iocharset\n");
363 return 0;
364 }
365 }
366 hsb->s_dir_umask &= 0777;
367 hsb->s_file_umask &= 0577;
368
369 return 1;
370}
371
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377
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379
380
381
382
383static int hfs_fill_super(struct super_block *sb, void *data, int silent)
384{
385 struct hfs_sb_info *sbi;
386 struct hfs_find_data fd;
387 hfs_cat_rec rec;
388 struct inode *root_inode;
389 int res;
390
391 sbi = kzalloc(sizeof(struct hfs_sb_info), GFP_KERNEL);
392 if (!sbi)
393 return -ENOMEM;
394
395 sbi->sb = sb;
396 sb->s_fs_info = sbi;
397 spin_lock_init(&sbi->work_lock);
398 INIT_DELAYED_WORK(&sbi->mdb_work, flush_mdb);
399
400 res = -EINVAL;
401 if (!parse_options((char *)data, sbi)) {
402 pr_err("unable to parse mount options\n");
403 goto bail;
404 }
405
406 sb->s_op = &hfs_super_operations;
407 sb->s_flags |= MS_NODIRATIME;
408 mutex_init(&sbi->bitmap_lock);
409
410 res = hfs_mdb_get(sb);
411 if (res) {
412 if (!silent)
413 pr_warn("can't find a HFS filesystem on dev %s\n",
414 hfs_mdb_name(sb));
415 res = -EINVAL;
416 goto bail;
417 }
418
419
420 res = hfs_find_init(HFS_SB(sb)->cat_tree, &fd);
421 if (res)
422 goto bail_no_root;
423 res = hfs_cat_find_brec(sb, HFS_ROOT_CNID, &fd);
424 if (!res) {
425 if (fd.entrylength > sizeof(rec) || fd.entrylength < 0) {
426 res = -EIO;
427 goto bail;
428 }
429 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, fd.entrylength);
430 }
431 if (res) {
432 hfs_find_exit(&fd);
433 goto bail_no_root;
434 }
435 res = -EINVAL;
436 root_inode = hfs_iget(sb, &fd.search_key->cat, &rec);
437 hfs_find_exit(&fd);
438 if (!root_inode)
439 goto bail_no_root;
440
441 sb->s_d_op = &hfs_dentry_operations;
442 res = -ENOMEM;
443 sb->s_root = d_make_root(root_inode);
444 if (!sb->s_root)
445 goto bail_no_root;
446
447
448 return 0;
449
450bail_no_root:
451 pr_err("get root inode failed\n");
452bail:
453 hfs_mdb_put(sb);
454 return res;
455}
456
457static struct dentry *hfs_mount(struct file_system_type *fs_type,
458 int flags, const char *dev_name, void *data)
459{
460 return mount_bdev(fs_type, flags, dev_name, data, hfs_fill_super);
461}
462
463static struct file_system_type hfs_fs_type = {
464 .owner = THIS_MODULE,
465 .name = "hfs",
466 .mount = hfs_mount,
467 .kill_sb = kill_block_super,
468 .fs_flags = FS_REQUIRES_DEV,
469};
470MODULE_ALIAS_FS("hfs");
471
472static void hfs_init_once(void *p)
473{
474 struct hfs_inode_info *i = p;
475
476 inode_init_once(&i->vfs_inode);
477}
478
479static int __init init_hfs_fs(void)
480{
481 int err;
482
483 hfs_inode_cachep = kmem_cache_create("hfs_inode_cache",
484 sizeof(struct hfs_inode_info), 0, SLAB_HWCACHE_ALIGN,
485 hfs_init_once);
486 if (!hfs_inode_cachep)
487 return -ENOMEM;
488 err = register_filesystem(&hfs_fs_type);
489 if (err)
490 kmem_cache_destroy(hfs_inode_cachep);
491 return err;
492}
493
494static void __exit exit_hfs_fs(void)
495{
496 unregister_filesystem(&hfs_fs_type);
497
498
499
500
501
502 rcu_barrier();
503 kmem_cache_destroy(hfs_inode_cachep);
504}
505
506module_init(init_hfs_fs)
507module_exit(exit_hfs_fs)
508
