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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 sync_filesystem(sb);
116 *flags |= MS_NODIRATIME;
117 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
118 return 0;
119 if (!(*flags & MS_RDONLY)) {
120 if (!(HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_UNMNT))) {
121 pr_warn("filesystem was not cleanly unmounted, running fsck.hfs is recommended. leaving read-only.\n");
122 sb->s_flags |= MS_RDONLY;
123 *flags |= MS_RDONLY;
124 } else if (HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_SLOCK)) {
125 pr_warn("filesystem is marked locked, leaving read-only.\n");
126 sb->s_flags |= MS_RDONLY;
127 *flags |= MS_RDONLY;
128 }
129 }
130 return 0;
131}
132
133static int hfs_show_options(struct seq_file *seq, struct dentry *root)
134{
135 struct hfs_sb_info *sbi = HFS_SB(root->d_sb);
136
137 if (sbi->s_creator != cpu_to_be32(0x3f3f3f3f))
138 seq_printf(seq, ",creator=%.4s", (char *)&sbi->s_creator);
139 if (sbi->s_type != cpu_to_be32(0x3f3f3f3f))
140 seq_printf(seq, ",type=%.4s", (char *)&sbi->s_type);
141 seq_printf(seq, ",uid=%u,gid=%u",
142 from_kuid_munged(&init_user_ns, sbi->s_uid),
143 from_kgid_munged(&init_user_ns, sbi->s_gid));
144 if (sbi->s_file_umask != 0133)
145 seq_printf(seq, ",file_umask=%o", sbi->s_file_umask);
146 if (sbi->s_dir_umask != 0022)
147 seq_printf(seq, ",dir_umask=%o", sbi->s_dir_umask);
148 if (sbi->part >= 0)
149 seq_printf(seq, ",part=%u", sbi->part);
150 if (sbi->session >= 0)
151 seq_printf(seq, ",session=%u", sbi->session);
152 if (sbi->nls_disk)
153 seq_printf(seq, ",codepage=%s", sbi->nls_disk->charset);
154 if (sbi->nls_io)
155 seq_printf(seq, ",iocharset=%s", sbi->nls_io->charset);
156 if (sbi->s_quiet)
157 seq_printf(seq, ",quiet");
158 return 0;
159}
160
161static struct inode *hfs_alloc_inode(struct super_block *sb)
162{
163 struct hfs_inode_info *i;
164
165 i = kmem_cache_alloc(hfs_inode_cachep, GFP_KERNEL);
166 return i ? &i->vfs_inode : NULL;
167}
168
169static void hfs_i_callback(struct rcu_head *head)
170{
171 struct inode *inode = container_of(head, struct inode, i_rcu);
172 kmem_cache_free(hfs_inode_cachep, HFS_I(inode));
173}
174
175static void hfs_destroy_inode(struct inode *inode)
176{
177 call_rcu(&inode->i_rcu, hfs_i_callback);
178}
179
180static const struct super_operations hfs_super_operations = {
181 .alloc_inode = hfs_alloc_inode,
182 .destroy_inode = hfs_destroy_inode,
183 .write_inode = hfs_write_inode,
184 .evict_inode = hfs_evict_inode,
185 .put_super = hfs_put_super,
186 .sync_fs = hfs_sync_fs,
187 .statfs = hfs_statfs,
188 .remount_fs = hfs_remount,
189 .show_options = hfs_show_options,
190};
191
192enum {
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
199static 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
215static 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
225
226
227
228
229static 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
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 pr_err("uid requires an argument\n");
257 return 0;
258 }
259 hsb->s_uid = make_kuid(current_user_ns(), (uid_t)tmp);
260 if (!uid_valid(hsb->s_uid)) {
261 pr_err("invalid uid %d\n", tmp);
262 return 0;
263 }
264 break;
265 case opt_gid:
266 if (match_int(&args[0], &tmp)) {
267 pr_err("gid requires an argument\n");
268 return 0;
269 }
270 hsb->s_gid = make_kgid(current_user_ns(), (gid_t)tmp);
271 if (!gid_valid(hsb->s_gid)) {
272 pr_err("invalid gid %d\n", tmp);
273 return 0;
274 }
275 break;
276 case opt_umask:
277 if (match_octal(&args[0], &tmp)) {
278 pr_err("umask requires a value\n");
279 return 0;
280 }
281 hsb->s_file_umask = (umode_t)tmp;
282 hsb->s_dir_umask = (umode_t)tmp;
283 break;
284 case opt_file_umask:
285 if (match_octal(&args[0], &tmp)) {
286 pr_err("file_umask requires a value\n");
287 return 0;
288 }
289 hsb->s_file_umask = (umode_t)tmp;
290 break;
291 case opt_dir_umask:
292 if (match_octal(&args[0], &tmp)) {
293 pr_err("dir_umask requires a value\n");
294 return 0;
295 }
296 hsb->s_dir_umask = (umode_t)tmp;
297 break;
298 case opt_part:
299 if (match_int(&args[0], &hsb->part)) {
300 pr_err("part requires an argument\n");
301 return 0;
302 }
303 break;
304 case opt_session:
305 if (match_int(&args[0], &hsb->session)) {
306 pr_err("session requires an argument\n");
307 return 0;
308 }
309 break;
310 case opt_type:
311 if (match_fourchar(&args[0], &hsb->s_type)) {
312 pr_err("type requires a 4 character value\n");
313 return 0;
314 }
315 break;
316 case opt_creator:
317 if (match_fourchar(&args[0], &hsb->s_creator)) {
318 pr_err("creator requires a 4 character value\n");
319 return 0;
320 }
321 break;
322 case opt_quiet:
323 hsb->s_quiet = 1;
324 break;
325 case opt_codepage:
326 if (hsb->nls_disk) {
327 pr_err("unable to change codepage\n");
328 return 0;
329 }
330 p = match_strdup(&args[0]);
331 if (p)
332 hsb->nls_disk = load_nls(p);
333 if (!hsb->nls_disk) {
334 pr_err("unable to load codepage \"%s\"\n", p);
335 kfree(p);
336 return 0;
337 }
338 kfree(p);
339 break;
340 case opt_iocharset:
341 if (hsb->nls_io) {
342 pr_err("unable to change iocharset\n");
343 return 0;
344 }
345 p = match_strdup(&args[0]);
346 if (p)
347 hsb->nls_io = load_nls(p);
348 if (!hsb->nls_io) {
349 pr_err("unable to load iocharset \"%s\"\n", p);
350 kfree(p);
351 return 0;
352 }
353 kfree(p);
354 break;
355 default:
356 return 0;
357 }
358 }
359
360 if (hsb->nls_disk && !hsb->nls_io) {
361 hsb->nls_io = load_nls_default();
362 if (!hsb->nls_io) {
363 pr_err("unable to load default iocharset\n");
364 return 0;
365 }
366 }
367 hsb->s_dir_umask &= 0777;
368 hsb->s_file_umask &= 0577;
369
370 return 1;
371}
372
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377
378
379
380
381
382
383
384static int hfs_fill_super(struct super_block *sb, void *data, int silent)
385{
386 struct hfs_sb_info *sbi;
387 struct hfs_find_data fd;
388 hfs_cat_rec rec;
389 struct inode *root_inode;
390 int res;
391
392 sbi = kzalloc(sizeof(struct hfs_sb_info), GFP_KERNEL);
393 if (!sbi)
394 return -ENOMEM;
395
396 sbi->sb = sb;
397 sb->s_fs_info = sbi;
398 spin_lock_init(&sbi->work_lock);
399 INIT_DELAYED_WORK(&sbi->mdb_work, flush_mdb);
400
401 res = -EINVAL;
402 if (!parse_options((char *)data, sbi)) {
403 pr_err("unable to parse mount options\n");
404 goto bail;
405 }
406
407 sb->s_op = &hfs_super_operations;
408 sb->s_flags |= MS_NODIRATIME;
409 mutex_init(&sbi->bitmap_lock);
410
411 res = hfs_mdb_get(sb);
412 if (res) {
413 if (!silent)
414 pr_warn("can't find a HFS filesystem on dev %s\n",
415 hfs_mdb_name(sb));
416 res = -EINVAL;
417 goto bail;
418 }
419
420
421 res = hfs_find_init(HFS_SB(sb)->cat_tree, &fd);
422 if (res)
423 goto bail_no_root;
424 res = hfs_cat_find_brec(sb, HFS_ROOT_CNID, &fd);
425 if (!res) {
426 if (fd.entrylength > sizeof(rec) || fd.entrylength < 0) {
427 res = -EIO;
428 goto bail;
429 }
430 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, fd.entrylength);
431 }
432 if (res) {
433 hfs_find_exit(&fd);
434 goto bail_no_root;
435 }
436 res = -EINVAL;
437 root_inode = hfs_iget(sb, &fd.search_key->cat, &rec);
438 hfs_find_exit(&fd);
439 if (!root_inode)
440 goto bail_no_root;
441
442 sb->s_d_op = &hfs_dentry_operations;
443 res = -ENOMEM;
444 sb->s_root = d_make_root(root_inode);
445 if (!sb->s_root)
446 goto bail_no_root;
447
448
449 return 0;
450
451bail_no_root:
452 pr_err("get root inode failed\n");
453bail:
454 hfs_mdb_put(sb);
455 return res;
456}
457
458static struct dentry *hfs_mount(struct file_system_type *fs_type,
459 int flags, const char *dev_name, void *data)
460{
461 return mount_bdev(fs_type, flags, dev_name, data, hfs_fill_super);
462}
463
464static struct file_system_type hfs_fs_type = {
465 .owner = THIS_MODULE,
466 .name = "hfs",
467 .mount = hfs_mount,
468 .kill_sb = kill_block_super,
469 .fs_flags = FS_REQUIRES_DEV,
470};
471MODULE_ALIAS_FS("hfs");
472
473static void hfs_init_once(void *p)
474{
475 struct hfs_inode_info *i = p;
476
477 inode_init_once(&i->vfs_inode);
478}
479
480static int __init init_hfs_fs(void)
481{
482 int err;
483
484 hfs_inode_cachep = kmem_cache_create("hfs_inode_cache",
485 sizeof(struct hfs_inode_info), 0, SLAB_HWCACHE_ALIGN,
486 hfs_init_once);
487 if (!hfs_inode_cachep)
488 return -ENOMEM;
489 err = register_filesystem(&hfs_fs_type);
490 if (err)
491 kmem_cache_destroy(hfs_inode_cachep);
492 return err;
493}
494
495static void __exit exit_hfs_fs(void)
496{
497 unregister_filesystem(&hfs_fs_type);
498
499
500
501
502
503 rcu_barrier();
504 kmem_cache_destroy(hfs_inode_cachep);
505}
506
507module_init(init_hfs_fs)
508module_exit(exit_hfs_fs)
509
