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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
28static struct kmem_cache *hfs_inode_cachep;
29
30MODULE_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 */
51static 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
62static 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 */
79static 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 */
97static 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
116static 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
136static int hfs_show_options(struct seq_file *seq, struct dentry *root)
137{
138 struct hfs_sb_info *sbi = HFS_SB(root->d_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
162static 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
170static void hfs_i_callback(struct rcu_head *head)
171{
172 struct inode *inode = container_of(head, struct inode, i_rcu);
173 kmem_cache_free(hfs_inode_cachep, HFS_I(inode));
174}
175
176static void hfs_destroy_inode(struct inode *inode)
177{
178 call_rcu(&inode->i_rcu, hfs_i_callback);
179}
180
181static const struct super_operations hfs_super_operations = {
182 .alloc_inode = hfs_alloc_inode,
183 .destroy_inode = hfs_destroy_inode,
184 .write_inode = hfs_write_inode,
185 .evict_inode = hfs_evict_inode,
186 .put_super = hfs_put_super,
187 .write_super = hfs_write_super,
188 .sync_fs = hfs_sync_fs,
189 .statfs = hfs_statfs,
190 .remount_fs = hfs_remount,
191 .show_options = hfs_show_options,
192};
193
194enum {
195 opt_uid, opt_gid, opt_umask, opt_file_umask, opt_dir_umask,
196 opt_part, opt_session, opt_type, opt_creator, opt_quiet,
197 opt_codepage, opt_iocharset,
198 opt_err
199};
200
201static const match_table_t tokens = {
202 { opt_uid, "uid=%u" },
203 { opt_gid, "gid=%u" },
204 { opt_umask, "umask=%o" },
205 { opt_file_umask, "file_umask=%o" },
206 { opt_dir_umask, "dir_umask=%o" },
207 { opt_part, "part=%u" },
208 { opt_session, "session=%u" },
209 { opt_type, "type=%s" },
210 { opt_creator, "creator=%s" },
211 { opt_quiet, "quiet" },
212 { opt_codepage, "codepage=%s" },
213 { opt_iocharset, "iocharset=%s" },
214 { opt_err, NULL }
215};
216
217static inline int match_fourchar(substring_t *arg, u32 *result)
218{
219 if (arg->to - arg->from != 4)
220 return -EINVAL;
221 memcpy(result, arg->from, 4);
222 return 0;
223}
224
225/*
226 * parse_options()
227 *
228 * adapted from linux/fs/msdos/inode.c written 1992,93 by Werner Almesberger
229 * This function is called by hfs_read_super() to parse the mount options.
230 */
231static int parse_options(char *options, struct hfs_sb_info *hsb)
232{
233 char *p;
234 substring_t args[MAX_OPT_ARGS];
235 int tmp, token;
236
237 /* initialize the sb with defaults */
238 hsb->s_uid = current_uid();
239 hsb->s_gid = current_gid();
240 hsb->s_file_umask = 0133;
241 hsb->s_dir_umask = 0022;
242 hsb->s_type = hsb->s_creator = cpu_to_be32(0x3f3f3f3f); /* == '????' */
243 hsb->s_quiet = 0;
244 hsb->part = -1;
245 hsb->session = -1;
246
247 if (!options)
248 return 1;
249
250 while ((p = strsep(&options, ",")) != NULL) {
251 if (!*p)
252 continue;
253
254 token = match_token(p, tokens, args);
255 switch (token) {
256 case opt_uid:
257 if (match_int(&args[0], &tmp)) {
258 printk(KERN_ERR "hfs: uid requires an argument\n");
259 return 0;
260 }
261 hsb->s_uid = (uid_t)tmp;
262 break;
263 case opt_gid:
264 if (match_int(&args[0], &tmp)) {
265 printk(KERN_ERR "hfs: gid requires an argument\n");
266 return 0;
267 }
268 hsb->s_gid = (gid_t)tmp;
269 break;
270 case opt_umask:
271 if (match_octal(&args[0], &tmp)) {
272 printk(KERN_ERR "hfs: umask requires a value\n");
273 return 0;
274 }
275 hsb->s_file_umask = (umode_t)tmp;
276 hsb->s_dir_umask = (umode_t)tmp;
277 break;
278 case opt_file_umask:
279 if (match_octal(&args[0], &tmp)) {
280 printk(KERN_ERR "hfs: file_umask requires a value\n");
281 return 0;
282 }
283 hsb->s_file_umask = (umode_t)tmp;
284 break;
285 case opt_dir_umask:
286 if (match_octal(&args[0], &tmp)) {
287 printk(KERN_ERR "hfs: dir_umask requires a value\n");
288 return 0;
289 }
290 hsb->s_dir_umask = (umode_t)tmp;
291 break;
292 case opt_part:
293 if (match_int(&args[0], &hsb->part)) {
294 printk(KERN_ERR "hfs: part requires an argument\n");
295 return 0;
296 }
297 break;
298 case opt_session:
299 if (match_int(&args[0], &hsb->session)) {
300 printk(KERN_ERR "hfs: session requires an argument\n");
301 return 0;
302 }
303 break;
304 case opt_type:
305 if (match_fourchar(&args[0], &hsb->s_type)) {
306 printk(KERN_ERR "hfs: type requires a 4 character value\n");
307 return 0;
308 }
309 break;
310 case opt_creator:
311 if (match_fourchar(&args[0], &hsb->s_creator)) {
312 printk(KERN_ERR "hfs: creator requires a 4 character value\n");
313 return 0;
314 }
315 break;
316 case opt_quiet:
317 hsb->s_quiet = 1;
318 break;
319 case opt_codepage:
320 if (hsb->nls_disk) {
321 printk(KERN_ERR "hfs: unable to change codepage\n");
322 return 0;
323 }
324 p = match_strdup(&args[0]);
325 if (p)
326 hsb->nls_disk = load_nls(p);
327 if (!hsb->nls_disk) {
328 printk(KERN_ERR "hfs: unable to load codepage \"%s\"\n", p);
329 kfree(p);
330 return 0;
331 }
332 kfree(p);
333 break;
334 case opt_iocharset:
335 if (hsb->nls_io) {
336 printk(KERN_ERR "hfs: unable to change iocharset\n");
337 return 0;
338 }
339 p = match_strdup(&args[0]);
340 if (p)
341 hsb->nls_io = load_nls(p);
342 if (!hsb->nls_io) {
343 printk(KERN_ERR "hfs: unable to load iocharset \"%s\"\n", p);
344 kfree(p);
345 return 0;
346 }
347 kfree(p);
348 break;
349 default:
350 return 0;
351 }
352 }
353
354 if (hsb->nls_disk && !hsb->nls_io) {
355 hsb->nls_io = load_nls_default();
356 if (!hsb->nls_io) {
357 printk(KERN_ERR "hfs: unable to load default iocharset\n");
358 return 0;
359 }
360 }
361 hsb->s_dir_umask &= 0777;
362 hsb->s_file_umask &= 0577;
363
364 return 1;
365}
366
367/*
368 * hfs_read_super()
369 *
370 * This is the function that is responsible for mounting an HFS
371 * filesystem. It performs all the tasks necessary to get enough data
372 * from the disk to read the root inode. This includes parsing the
373 * mount options, dealing with Macintosh partitions, reading the
374 * superblock and the allocation bitmap blocks, calling
375 * hfs_btree_init() to get the necessary data about the extents and
376 * catalog B-trees and, finally, reading the root inode into memory.
377 */
378static int hfs_fill_super(struct super_block *sb, void *data, int silent)
379{
380 struct hfs_sb_info *sbi;
381 struct hfs_find_data fd;
382 hfs_cat_rec rec;
383 struct inode *root_inode;
384 int res;
385
386 sbi = kzalloc(sizeof(struct hfs_sb_info), GFP_KERNEL);
387 if (!sbi)
388 return -ENOMEM;
389
390 sb->s_fs_info = sbi;
391
392 res = -EINVAL;
393 if (!parse_options((char *)data, sbi)) {
394 printk(KERN_ERR "hfs: unable to parse mount options.\n");
395 goto bail;
396 }
397
398 sb->s_op = &hfs_super_operations;
399 sb->s_flags |= MS_NODIRATIME;
400 mutex_init(&sbi->bitmap_lock);
401
402 res = hfs_mdb_get(sb);
403 if (res) {
404 if (!silent)
405 printk(KERN_WARNING "hfs: can't find a HFS filesystem on dev %s.\n",
406 hfs_mdb_name(sb));
407 res = -EINVAL;
408 goto bail;
409 }
410
411 /* try to get the root inode */
412 hfs_find_init(HFS_SB(sb)->cat_tree, &fd);
413 res = hfs_cat_find_brec(sb, HFS_ROOT_CNID, &fd);
414 if (!res) {
415 if (fd.entrylength > sizeof(rec) || fd.entrylength < 0) {
416 res = -EIO;
417 goto bail;
418 }
419 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, fd.entrylength);
420 }
421 if (res) {
422 hfs_find_exit(&fd);
423 goto bail_no_root;
424 }
425 res = -EINVAL;
426 root_inode = hfs_iget(sb, &fd.search_key->cat, &rec);
427 hfs_find_exit(&fd);
428 if (!root_inode)
429 goto bail_no_root;
430
431 sb->s_d_op = &hfs_dentry_operations;
432 res = -ENOMEM;
433 sb->s_root = d_make_root(root_inode);
434 if (!sb->s_root)
435 goto bail_no_root;
436
437 /* everything's okay */
438 return 0;
439
440bail_no_root:
441 printk(KERN_ERR "hfs: get root inode failed.\n");
442bail:
443 hfs_mdb_put(sb);
444 return res;
445}
446
447static struct dentry *hfs_mount(struct file_system_type *fs_type,
448 int flags, const char *dev_name, void *data)
449{
450 return mount_bdev(fs_type, flags, dev_name, data, hfs_fill_super);
451}
452
453static struct file_system_type hfs_fs_type = {
454 .owner = THIS_MODULE,
455 .name = "hfs",
456 .mount = hfs_mount,
457 .kill_sb = kill_block_super,
458 .fs_flags = FS_REQUIRES_DEV,
459};
460
461static void hfs_init_once(void *p)
462{
463 struct hfs_inode_info *i = p;
464
465 inode_init_once(&i->vfs_inode);
466}
467
468static int __init init_hfs_fs(void)
469{
470 int err;
471
472 hfs_inode_cachep = kmem_cache_create("hfs_inode_cache",
473 sizeof(struct hfs_inode_info), 0, SLAB_HWCACHE_ALIGN,
474 hfs_init_once);
475 if (!hfs_inode_cachep)
476 return -ENOMEM;
477 err = register_filesystem(&hfs_fs_type);
478 if (err)
479 kmem_cache_destroy(hfs_inode_cachep);
480 return err;
481}
482
483static void __exit exit_hfs_fs(void)
484{
485 unregister_filesystem(&hfs_fs_type);
486 kmem_cache_destroy(hfs_inode_cachep);
487}
488
489module_init(init_hfs_fs)
490module_exit(exit_hfs_fs)
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/backing-dev.h>
18#include <linux/mount.h>
19#include <linux/init.h>
20#include <linux/nls.h>
21#include <linux/parser.h>
22#include <linux/seq_file.h>
23#include <linux/slab.h>
24#include <linux/vfs.h>
25
26#include "hfs_fs.h"
27#include "btree.h"
28
29static struct kmem_cache *hfs_inode_cachep;
30
31MODULE_LICENSE("GPL");
32
33static int hfs_sync_fs(struct super_block *sb, int wait)
34{
35 hfs_mdb_commit(sb);
36 return 0;
37}
38
39/*
40 * hfs_put_super()
41 *
42 * This is the put_super() entry in the super_operations structure for
43 * HFS filesystems. The purpose is to release the resources
44 * associated with the superblock sb.
45 */
46static void hfs_put_super(struct super_block *sb)
47{
48 cancel_delayed_work_sync(&HFS_SB(sb)->mdb_work);
49 hfs_mdb_close(sb);
50 /* release the MDB's resources */
51 hfs_mdb_put(sb);
52}
53
54static void flush_mdb(struct work_struct *work)
55{
56 struct hfs_sb_info *sbi;
57 struct super_block *sb;
58
59 sbi = container_of(work, struct hfs_sb_info, mdb_work.work);
60 sb = sbi->sb;
61
62 spin_lock(&sbi->work_lock);
63 sbi->work_queued = 0;
64 spin_unlock(&sbi->work_lock);
65
66 hfs_mdb_commit(sb);
67}
68
69void hfs_mark_mdb_dirty(struct super_block *sb)
70{
71 struct hfs_sb_info *sbi = HFS_SB(sb);
72 unsigned long delay;
73
74 if (sb_rdonly(sb))
75 return;
76
77 spin_lock(&sbi->work_lock);
78 if (!sbi->work_queued) {
79 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
80 queue_delayed_work(system_long_wq, &sbi->mdb_work, delay);
81 sbi->work_queued = 1;
82 }
83 spin_unlock(&sbi->work_lock);
84}
85
86/*
87 * hfs_statfs()
88 *
89 * This is the statfs() entry in the super_operations structure for
90 * HFS filesystems. The purpose is to return various data about the
91 * filesystem.
92 *
93 * changed f_files/f_ffree to reflect the fs_ablock/free_ablocks.
94 */
95static int hfs_statfs(struct dentry *dentry, struct kstatfs *buf)
96{
97 struct super_block *sb = dentry->d_sb;
98 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
99
100 buf->f_type = HFS_SUPER_MAGIC;
101 buf->f_bsize = sb->s_blocksize;
102 buf->f_blocks = (u32)HFS_SB(sb)->fs_ablocks * HFS_SB(sb)->fs_div;
103 buf->f_bfree = (u32)HFS_SB(sb)->free_ablocks * HFS_SB(sb)->fs_div;
104 buf->f_bavail = buf->f_bfree;
105 buf->f_files = HFS_SB(sb)->fs_ablocks;
106 buf->f_ffree = HFS_SB(sb)->free_ablocks;
107 buf->f_fsid = u64_to_fsid(id);
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 |= SB_NODIRATIME;
117 if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
118 return 0;
119 if (!(*flags & SB_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 |= SB_RDONLY;
123 *flags |= SB_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 |= SB_RDONLY;
127 *flags |= SB_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_show_option_n(seq, "creator", (char *)&sbi->s_creator, 4);
139 if (sbi->s_type != cpu_to_be32(0x3f3f3f3f))
140 seq_show_option_n(seq, "type", (char *)&sbi->s_type, 4);
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 = alloc_inode_sb(sb, hfs_inode_cachep, GFP_KERNEL);
166 return i ? &i->vfs_inode : NULL;
167}
168
169static void hfs_free_inode(struct inode *inode)
170{
171 kmem_cache_free(hfs_inode_cachep, HFS_I(inode));
172}
173
174static const struct super_operations hfs_super_operations = {
175 .alloc_inode = hfs_alloc_inode,
176 .free_inode = hfs_free_inode,
177 .write_inode = hfs_write_inode,
178 .evict_inode = hfs_evict_inode,
179 .put_super = hfs_put_super,
180 .sync_fs = hfs_sync_fs,
181 .statfs = hfs_statfs,
182 .remount_fs = hfs_remount,
183 .show_options = hfs_show_options,
184};
185
186enum {
187 opt_uid, opt_gid, opt_umask, opt_file_umask, opt_dir_umask,
188 opt_part, opt_session, opt_type, opt_creator, opt_quiet,
189 opt_codepage, opt_iocharset,
190 opt_err
191};
192
193static const match_table_t tokens = {
194 { opt_uid, "uid=%u" },
195 { opt_gid, "gid=%u" },
196 { opt_umask, "umask=%o" },
197 { opt_file_umask, "file_umask=%o" },
198 { opt_dir_umask, "dir_umask=%o" },
199 { opt_part, "part=%u" },
200 { opt_session, "session=%u" },
201 { opt_type, "type=%s" },
202 { opt_creator, "creator=%s" },
203 { opt_quiet, "quiet" },
204 { opt_codepage, "codepage=%s" },
205 { opt_iocharset, "iocharset=%s" },
206 { opt_err, NULL }
207};
208
209static inline int match_fourchar(substring_t *arg, u32 *result)
210{
211 if (arg->to - arg->from != 4)
212 return -EINVAL;
213 memcpy(result, arg->from, 4);
214 return 0;
215}
216
217/*
218 * parse_options()
219 *
220 * adapted from linux/fs/msdos/inode.c written 1992,93 by Werner Almesberger
221 * This function is called by hfs_read_super() to parse the mount options.
222 */
223static int parse_options(char *options, struct hfs_sb_info *hsb)
224{
225 char *p;
226 substring_t args[MAX_OPT_ARGS];
227 int tmp, token;
228
229 /* initialize the sb with defaults */
230 hsb->s_uid = current_uid();
231 hsb->s_gid = current_gid();
232 hsb->s_file_umask = 0133;
233 hsb->s_dir_umask = 0022;
234 hsb->s_type = hsb->s_creator = cpu_to_be32(0x3f3f3f3f); /* == '????' */
235 hsb->s_quiet = 0;
236 hsb->part = -1;
237 hsb->session = -1;
238
239 if (!options)
240 return 1;
241
242 while ((p = strsep(&options, ",")) != NULL) {
243 if (!*p)
244 continue;
245
246 token = match_token(p, tokens, args);
247 switch (token) {
248 case opt_uid:
249 if (match_int(&args[0], &tmp)) {
250 pr_err("uid requires an argument\n");
251 return 0;
252 }
253 hsb->s_uid = make_kuid(current_user_ns(), (uid_t)tmp);
254 if (!uid_valid(hsb->s_uid)) {
255 pr_err("invalid uid %d\n", tmp);
256 return 0;
257 }
258 break;
259 case opt_gid:
260 if (match_int(&args[0], &tmp)) {
261 pr_err("gid requires an argument\n");
262 return 0;
263 }
264 hsb->s_gid = make_kgid(current_user_ns(), (gid_t)tmp);
265 if (!gid_valid(hsb->s_gid)) {
266 pr_err("invalid gid %d\n", tmp);
267 return 0;
268 }
269 break;
270 case opt_umask:
271 if (match_octal(&args[0], &tmp)) {
272 pr_err("umask requires a value\n");
273 return 0;
274 }
275 hsb->s_file_umask = (umode_t)tmp;
276 hsb->s_dir_umask = (umode_t)tmp;
277 break;
278 case opt_file_umask:
279 if (match_octal(&args[0], &tmp)) {
280 pr_err("file_umask requires a value\n");
281 return 0;
282 }
283 hsb->s_file_umask = (umode_t)tmp;
284 break;
285 case opt_dir_umask:
286 if (match_octal(&args[0], &tmp)) {
287 pr_err("dir_umask requires a value\n");
288 return 0;
289 }
290 hsb->s_dir_umask = (umode_t)tmp;
291 break;
292 case opt_part:
293 if (match_int(&args[0], &hsb->part)) {
294 pr_err("part requires an argument\n");
295 return 0;
296 }
297 break;
298 case opt_session:
299 if (match_int(&args[0], &hsb->session)) {
300 pr_err("session requires an argument\n");
301 return 0;
302 }
303 break;
304 case opt_type:
305 if (match_fourchar(&args[0], &hsb->s_type)) {
306 pr_err("type requires a 4 character value\n");
307 return 0;
308 }
309 break;
310 case opt_creator:
311 if (match_fourchar(&args[0], &hsb->s_creator)) {
312 pr_err("creator requires a 4 character value\n");
313 return 0;
314 }
315 break;
316 case opt_quiet:
317 hsb->s_quiet = 1;
318 break;
319 case opt_codepage:
320 if (hsb->nls_disk) {
321 pr_err("unable to change codepage\n");
322 return 0;
323 }
324 p = match_strdup(&args[0]);
325 if (p)
326 hsb->nls_disk = load_nls(p);
327 if (!hsb->nls_disk) {
328 pr_err("unable to load codepage \"%s\"\n", p);
329 kfree(p);
330 return 0;
331 }
332 kfree(p);
333 break;
334 case opt_iocharset:
335 if (hsb->nls_io) {
336 pr_err("unable to change iocharset\n");
337 return 0;
338 }
339 p = match_strdup(&args[0]);
340 if (p)
341 hsb->nls_io = load_nls(p);
342 if (!hsb->nls_io) {
343 pr_err("unable to load iocharset \"%s\"\n", p);
344 kfree(p);
345 return 0;
346 }
347 kfree(p);
348 break;
349 default:
350 return 0;
351 }
352 }
353
354 if (hsb->nls_disk && !hsb->nls_io) {
355 hsb->nls_io = load_nls_default();
356 if (!hsb->nls_io) {
357 pr_err("unable to load default iocharset\n");
358 return 0;
359 }
360 }
361 hsb->s_dir_umask &= 0777;
362 hsb->s_file_umask &= 0577;
363
364 return 1;
365}
366
367/*
368 * hfs_read_super()
369 *
370 * This is the function that is responsible for mounting an HFS
371 * filesystem. It performs all the tasks necessary to get enough data
372 * from the disk to read the root inode. This includes parsing the
373 * mount options, dealing with Macintosh partitions, reading the
374 * superblock and the allocation bitmap blocks, calling
375 * hfs_btree_init() to get the necessary data about the extents and
376 * catalog B-trees and, finally, reading the root inode into memory.
377 */
378static int hfs_fill_super(struct super_block *sb, void *data, int silent)
379{
380 struct hfs_sb_info *sbi;
381 struct hfs_find_data fd;
382 hfs_cat_rec rec;
383 struct inode *root_inode;
384 int res;
385
386 sbi = kzalloc(sizeof(struct hfs_sb_info), GFP_KERNEL);
387 if (!sbi)
388 return -ENOMEM;
389
390 sbi->sb = sb;
391 sb->s_fs_info = sbi;
392 spin_lock_init(&sbi->work_lock);
393 INIT_DELAYED_WORK(&sbi->mdb_work, flush_mdb);
394
395 res = -EINVAL;
396 if (!parse_options((char *)data, sbi)) {
397 pr_err("unable to parse mount options\n");
398 goto bail;
399 }
400
401 sb->s_op = &hfs_super_operations;
402 sb->s_xattr = hfs_xattr_handlers;
403 sb->s_flags |= SB_NODIRATIME;
404 mutex_init(&sbi->bitmap_lock);
405
406 res = hfs_mdb_get(sb);
407 if (res) {
408 if (!silent)
409 pr_warn("can't find a HFS filesystem on dev %s\n",
410 hfs_mdb_name(sb));
411 res = -EINVAL;
412 goto bail;
413 }
414
415 /* try to get the root inode */
416 res = hfs_find_init(HFS_SB(sb)->cat_tree, &fd);
417 if (res)
418 goto bail_no_root;
419 res = hfs_cat_find_brec(sb, HFS_ROOT_CNID, &fd);
420 if (!res) {
421 if (fd.entrylength > sizeof(rec) || fd.entrylength < 0) {
422 res = -EIO;
423 goto bail_hfs_find;
424 }
425 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, fd.entrylength);
426 }
427 if (res)
428 goto bail_hfs_find;
429 res = -EINVAL;
430 root_inode = hfs_iget(sb, &fd.search_key->cat, &rec);
431 hfs_find_exit(&fd);
432 if (!root_inode)
433 goto bail_no_root;
434
435 sb->s_d_op = &hfs_dentry_operations;
436 res = -ENOMEM;
437 sb->s_root = d_make_root(root_inode);
438 if (!sb->s_root)
439 goto bail_no_root;
440
441 /* everything's okay */
442 return 0;
443
444bail_hfs_find:
445 hfs_find_exit(&fd);
446bail_no_root:
447 pr_err("get root inode failed\n");
448bail:
449 hfs_mdb_put(sb);
450 return res;
451}
452
453static struct dentry *hfs_mount(struct file_system_type *fs_type,
454 int flags, const char *dev_name, void *data)
455{
456 return mount_bdev(fs_type, flags, dev_name, data, hfs_fill_super);
457}
458
459static struct file_system_type hfs_fs_type = {
460 .owner = THIS_MODULE,
461 .name = "hfs",
462 .mount = hfs_mount,
463 .kill_sb = kill_block_super,
464 .fs_flags = FS_REQUIRES_DEV,
465};
466MODULE_ALIAS_FS("hfs");
467
468static void hfs_init_once(void *p)
469{
470 struct hfs_inode_info *i = p;
471
472 inode_init_once(&i->vfs_inode);
473}
474
475static int __init init_hfs_fs(void)
476{
477 int err;
478
479 hfs_inode_cachep = kmem_cache_create("hfs_inode_cache",
480 sizeof(struct hfs_inode_info), 0,
481 SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, hfs_init_once);
482 if (!hfs_inode_cachep)
483 return -ENOMEM;
484 err = register_filesystem(&hfs_fs_type);
485 if (err)
486 kmem_cache_destroy(hfs_inode_cachep);
487 return err;
488}
489
490static void __exit exit_hfs_fs(void)
491{
492 unregister_filesystem(&hfs_fs_type);
493
494 /*
495 * Make sure all delayed rcu free inodes are flushed before we
496 * destroy cache.
497 */
498 rcu_barrier();
499 kmem_cache_destroy(hfs_inode_cachep);
500}
501
502module_init(init_hfs_fs)
503module_exit(exit_hfs_fs)