blob: d9227bf14e86b2a93cee03e9ef2482c30cc4d2b8 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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_module() and cleanup_module(). 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/config.h>
16#include <linux/module.h>
17#include <linux/blkdev.h>
Roman Zippel717dd802005-09-06 15:18:48 -070018#include <linux/mount.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <linux/init.h>
Roman Zippel328b9222005-09-06 15:18:49 -070020#include <linux/nls.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#include <linux/parser.h>
Roman Zippel717dd802005-09-06 15:18:48 -070022#include <linux/seq_file.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <linux/vfs.h>
24
25#include "hfs_fs.h"
26#include "btree.h"
27
28static kmem_cache_t *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 sb->s_dirt = 0;
54 if (sb->s_flags & MS_RDONLY)
55 return;
56 /* sync everything to the buffers */
57 hfs_mdb_commit(sb);
58}
59
60/*
61 * hfs_put_super()
62 *
63 * This is the put_super() entry in the super_operations structure for
64 * HFS filesystems. The purpose is to release the resources
65 * associated with the superblock sb.
66 */
67static void hfs_put_super(struct super_block *sb)
68{
69 hfs_mdb_close(sb);
70 /* release the MDB's resources */
71 hfs_mdb_put(sb);
72}
73
74/*
75 * hfs_statfs()
76 *
77 * This is the statfs() entry in the super_operations structure for
78 * HFS filesystems. The purpose is to return various data about the
79 * filesystem.
80 *
81 * changed f_files/f_ffree to reflect the fs_ablock/free_ablocks.
82 */
David Howells726c3342006-06-23 02:02:58 -070083static int hfs_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -070084{
David Howells726c3342006-06-23 02:02:58 -070085 struct super_block *sb = dentry->d_sb;
86
Linus Torvalds1da177e2005-04-16 15:20:36 -070087 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_namelen = HFS_NAMELEN;
95
96 return 0;
97}
98
99static int hfs_remount(struct super_block *sb, int *flags, char *data)
100{
101 *flags |= MS_NODIRATIME;
102 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
103 return 0;
104 if (!(*flags & MS_RDONLY)) {
105 if (!(HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_UNMNT))) {
Roman Zippel7cf3cc32006-01-18 17:43:07 -0800106 printk(KERN_WARNING "hfs: filesystem was not cleanly unmounted, "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 "running fsck.hfs is recommended. leaving read-only.\n");
108 sb->s_flags |= MS_RDONLY;
109 *flags |= MS_RDONLY;
110 } else if (HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_SLOCK)) {
Roman Zippel7cf3cc32006-01-18 17:43:07 -0800111 printk(KERN_WARNING "hfs: filesystem is marked locked, leaving read-only.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 sb->s_flags |= MS_RDONLY;
113 *flags |= MS_RDONLY;
114 }
115 }
116 return 0;
117}
118
Roman Zippel717dd802005-09-06 15:18:48 -0700119static int hfs_show_options(struct seq_file *seq, struct vfsmount *mnt)
120{
121 struct hfs_sb_info *sbi = HFS_SB(mnt->mnt_sb);
122
123 if (sbi->s_creator != cpu_to_be32(0x3f3f3f3f))
124 seq_printf(seq, ",creator=%.4s", (char *)&sbi->s_creator);
125 if (sbi->s_type != cpu_to_be32(0x3f3f3f3f))
126 seq_printf(seq, ",type=%.4s", (char *)&sbi->s_type);
127 seq_printf(seq, ",uid=%u,gid=%u", sbi->s_uid, sbi->s_gid);
128 if (sbi->s_file_umask != 0133)
129 seq_printf(seq, ",file_umask=%o", sbi->s_file_umask);
130 if (sbi->s_dir_umask != 0022)
131 seq_printf(seq, ",dir_umask=%o", sbi->s_dir_umask);
132 if (sbi->part >= 0)
133 seq_printf(seq, ",part=%u", sbi->part);
134 if (sbi->session >= 0)
135 seq_printf(seq, ",session=%u", sbi->session);
Roman Zippel328b9222005-09-06 15:18:49 -0700136 if (sbi->nls_disk)
137 seq_printf(seq, ",codepage=%s", sbi->nls_disk->charset);
138 if (sbi->nls_io)
139 seq_printf(seq, ",iocharset=%s", sbi->nls_io->charset);
Roman Zippel717dd802005-09-06 15:18:48 -0700140 if (sbi->s_quiet)
141 seq_printf(seq, ",quiet");
142 return 0;
143}
144
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145static struct inode *hfs_alloc_inode(struct super_block *sb)
146{
147 struct hfs_inode_info *i;
148
149 i = kmem_cache_alloc(hfs_inode_cachep, SLAB_KERNEL);
150 return i ? &i->vfs_inode : NULL;
151}
152
153static void hfs_destroy_inode(struct inode *inode)
154{
155 kmem_cache_free(hfs_inode_cachep, HFS_I(inode));
156}
157
158static struct super_operations hfs_super_operations = {
159 .alloc_inode = hfs_alloc_inode,
160 .destroy_inode = hfs_destroy_inode,
161 .write_inode = hfs_write_inode,
162 .clear_inode = hfs_clear_inode,
163 .put_super = hfs_put_super,
164 .write_super = hfs_write_super,
165 .statfs = hfs_statfs,
166 .remount_fs = hfs_remount,
Roman Zippel717dd802005-09-06 15:18:48 -0700167 .show_options = hfs_show_options,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168};
169
170enum {
171 opt_uid, opt_gid, opt_umask, opt_file_umask, opt_dir_umask,
172 opt_part, opt_session, opt_type, opt_creator, opt_quiet,
Roman Zippel328b9222005-09-06 15:18:49 -0700173 opt_codepage, opt_iocharset,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 opt_err
175};
176
177static match_table_t tokens = {
178 { opt_uid, "uid=%u" },
179 { opt_gid, "gid=%u" },
180 { opt_umask, "umask=%o" },
181 { opt_file_umask, "file_umask=%o" },
182 { opt_dir_umask, "dir_umask=%o" },
183 { opt_part, "part=%u" },
184 { opt_session, "session=%u" },
185 { opt_type, "type=%s" },
186 { opt_creator, "creator=%s" },
187 { opt_quiet, "quiet" },
Roman Zippel328b9222005-09-06 15:18:49 -0700188 { opt_codepage, "codepage=%s" },
189 { opt_iocharset, "iocharset=%s" },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 { opt_err, NULL }
191};
192
193static inline int match_fourchar(substring_t *arg, u32 *result)
194{
195 if (arg->to - arg->from != 4)
196 return -EINVAL;
197 memcpy(result, arg->from, 4);
198 return 0;
199}
200
201/*
202 * parse_options()
203 *
204 * adapted from linux/fs/msdos/inode.c written 1992,93 by Werner Almesberger
205 * This function is called by hfs_read_super() to parse the mount options.
206 */
207static int parse_options(char *options, struct hfs_sb_info *hsb)
208{
209 char *p;
210 substring_t args[MAX_OPT_ARGS];
211 int tmp, token;
212
213 /* initialize the sb with defaults */
214 hsb->s_uid = current->uid;
215 hsb->s_gid = current->gid;
216 hsb->s_file_umask = 0133;
217 hsb->s_dir_umask = 0022;
218 hsb->s_type = hsb->s_creator = cpu_to_be32(0x3f3f3f3f); /* == '????' */
219 hsb->s_quiet = 0;
220 hsb->part = -1;
221 hsb->session = -1;
222
223 if (!options)
224 return 1;
225
226 while ((p = strsep(&options, ",")) != NULL) {
227 if (!*p)
228 continue;
229
230 token = match_token(p, tokens, args);
231 switch (token) {
232 case opt_uid:
233 if (match_int(&args[0], &tmp)) {
Roman Zippel7cf3cc32006-01-18 17:43:07 -0800234 printk(KERN_ERR "hfs: uid requires an argument\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 return 0;
236 }
237 hsb->s_uid = (uid_t)tmp;
238 break;
239 case opt_gid:
240 if (match_int(&args[0], &tmp)) {
Roman Zippel7cf3cc32006-01-18 17:43:07 -0800241 printk(KERN_ERR "hfs: gid requires an argument\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 return 0;
243 }
244 hsb->s_gid = (gid_t)tmp;
245 break;
246 case opt_umask:
247 if (match_octal(&args[0], &tmp)) {
Roman Zippel7cf3cc32006-01-18 17:43:07 -0800248 printk(KERN_ERR "hfs: umask requires a value\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 return 0;
250 }
251 hsb->s_file_umask = (umode_t)tmp;
252 hsb->s_dir_umask = (umode_t)tmp;
253 break;
254 case opt_file_umask:
255 if (match_octal(&args[0], &tmp)) {
Roman Zippel7cf3cc32006-01-18 17:43:07 -0800256 printk(KERN_ERR "hfs: file_umask requires a value\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 return 0;
258 }
259 hsb->s_file_umask = (umode_t)tmp;
260 break;
261 case opt_dir_umask:
262 if (match_octal(&args[0], &tmp)) {
Roman Zippel7cf3cc32006-01-18 17:43:07 -0800263 printk(KERN_ERR "hfs: dir_umask requires a value\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 return 0;
265 }
266 hsb->s_dir_umask = (umode_t)tmp;
267 break;
268 case opt_part:
269 if (match_int(&args[0], &hsb->part)) {
Roman Zippel7cf3cc32006-01-18 17:43:07 -0800270 printk(KERN_ERR "hfs: part requires an argument\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 return 0;
272 }
273 break;
274 case opt_session:
275 if (match_int(&args[0], &hsb->session)) {
Roman Zippel7cf3cc32006-01-18 17:43:07 -0800276 printk(KERN_ERR "hfs: session requires an argument\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 return 0;
278 }
279 break;
280 case opt_type:
281 if (match_fourchar(&args[0], &hsb->s_type)) {
Roman Zippel7cf3cc32006-01-18 17:43:07 -0800282 printk(KERN_ERR "hfs: type requires a 4 character value\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 return 0;
284 }
285 break;
286 case opt_creator:
287 if (match_fourchar(&args[0], &hsb->s_creator)) {
Roman Zippel7cf3cc32006-01-18 17:43:07 -0800288 printk(KERN_ERR "hfs: creator requires a 4 character value\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 return 0;
290 }
291 break;
292 case opt_quiet:
293 hsb->s_quiet = 1;
294 break;
Roman Zippel328b9222005-09-06 15:18:49 -0700295 case opt_codepage:
296 if (hsb->nls_disk) {
Roman Zippel7cf3cc32006-01-18 17:43:07 -0800297 printk(KERN_ERR "hfs: unable to change codepage\n");
Roman Zippel328b9222005-09-06 15:18:49 -0700298 return 0;
299 }
300 p = match_strdup(&args[0]);
301 hsb->nls_disk = load_nls(p);
302 if (!hsb->nls_disk) {
Roman Zippel7cf3cc32006-01-18 17:43:07 -0800303 printk(KERN_ERR "hfs: unable to load codepage \"%s\"\n", p);
Roman Zippel328b9222005-09-06 15:18:49 -0700304 kfree(p);
305 return 0;
306 }
307 kfree(p);
308 break;
309 case opt_iocharset:
310 if (hsb->nls_io) {
Roman Zippel7cf3cc32006-01-18 17:43:07 -0800311 printk(KERN_ERR "hfs: unable to change iocharset\n");
Roman Zippel328b9222005-09-06 15:18:49 -0700312 return 0;
313 }
314 p = match_strdup(&args[0]);
315 hsb->nls_io = load_nls(p);
316 if (!hsb->nls_io) {
Roman Zippel7cf3cc32006-01-18 17:43:07 -0800317 printk(KERN_ERR "hfs: unable to load iocharset \"%s\"\n", p);
Roman Zippel328b9222005-09-06 15:18:49 -0700318 kfree(p);
319 return 0;
320 }
321 kfree(p);
322 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 default:
324 return 0;
325 }
326 }
327
Roman Zippel328b9222005-09-06 15:18:49 -0700328 if (hsb->nls_disk && !hsb->nls_io) {
329 hsb->nls_io = load_nls_default();
330 if (!hsb->nls_io) {
Roman Zippel7cf3cc32006-01-18 17:43:07 -0800331 printk(KERN_ERR "hfs: unable to load default iocharset\n");
Roman Zippel328b9222005-09-06 15:18:49 -0700332 return 0;
333 }
334 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335 hsb->s_dir_umask &= 0777;
336 hsb->s_file_umask &= 0577;
337
338 return 1;
339}
340
341/*
342 * hfs_read_super()
343 *
344 * This is the function that is responsible for mounting an HFS
345 * filesystem. It performs all the tasks necessary to get enough data
346 * from the disk to read the root inode. This includes parsing the
347 * mount options, dealing with Macintosh partitions, reading the
348 * superblock and the allocation bitmap blocks, calling
349 * hfs_btree_init() to get the necessary data about the extents and
350 * catalog B-trees and, finally, reading the root inode into memory.
351 */
352static int hfs_fill_super(struct super_block *sb, void *data, int silent)
353{
354 struct hfs_sb_info *sbi;
355 struct hfs_find_data fd;
356 hfs_cat_rec rec;
357 struct inode *root_inode;
358 int res;
359
360 sbi = kmalloc(sizeof(struct hfs_sb_info), GFP_KERNEL);
361 if (!sbi)
362 return -ENOMEM;
363 sb->s_fs_info = sbi;
364 memset(sbi, 0, sizeof(struct hfs_sb_info));
365 INIT_HLIST_HEAD(&sbi->rsrc_inodes);
366
367 res = -EINVAL;
368 if (!parse_options((char *)data, sbi)) {
Roman Zippel7cf3cc32006-01-18 17:43:07 -0800369 printk(KERN_ERR "hfs: unable to parse mount options.\n");
Colin Leroy945b0922005-05-01 08:59:16 -0700370 goto bail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371 }
372
373 sb->s_op = &hfs_super_operations;
374 sb->s_flags |= MS_NODIRATIME;
375 init_MUTEX(&sbi->bitmap_lock);
376
377 res = hfs_mdb_get(sb);
378 if (res) {
379 if (!silent)
Roman Zippel7cf3cc32006-01-18 17:43:07 -0800380 printk(KERN_WARNING "hfs: can't find a HFS filesystem on dev %s.\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 hfs_mdb_name(sb));
382 res = -EINVAL;
Colin Leroy945b0922005-05-01 08:59:16 -0700383 goto bail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 }
385
386 /* try to get the root inode */
387 hfs_find_init(HFS_SB(sb)->cat_tree, &fd);
388 res = hfs_cat_find_brec(sb, HFS_ROOT_CNID, &fd);
389 if (!res)
390 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, fd.entrylength);
391 if (res) {
392 hfs_find_exit(&fd);
393 goto bail_no_root;
394 }
395 root_inode = hfs_iget(sb, &fd.search_key->cat, &rec);
396 hfs_find_exit(&fd);
397 if (!root_inode)
398 goto bail_no_root;
399
400 sb->s_root = d_alloc_root(root_inode);
401 if (!sb->s_root)
402 goto bail_iput;
403
404 sb->s_root->d_op = &hfs_dentry_operations;
405
406 /* everything's okay */
407 return 0;
408
409bail_iput:
410 iput(root_inode);
411bail_no_root:
Roman Zippel7cf3cc32006-01-18 17:43:07 -0800412 printk(KERN_ERR "hfs: get root inode failed.\n");
Colin Leroy945b0922005-05-01 08:59:16 -0700413bail:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 hfs_mdb_put(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 return res;
416}
417
David Howells454e2392006-06-23 02:02:57 -0700418static int hfs_get_sb(struct file_system_type *fs_type,
419 int flags, const char *dev_name, void *data,
420 struct vfsmount *mnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421{
David Howells454e2392006-06-23 02:02:57 -0700422 return get_sb_bdev(fs_type, flags, dev_name, data, hfs_fill_super, mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423}
424
425static struct file_system_type hfs_fs_type = {
426 .owner = THIS_MODULE,
427 .name = "hfs",
428 .get_sb = hfs_get_sb,
429 .kill_sb = kill_block_super,
430 .fs_flags = FS_REQUIRES_DEV,
431};
432
433static void hfs_init_once(void *p, kmem_cache_t *cachep, unsigned long flags)
434{
435 struct hfs_inode_info *i = p;
436
437 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == SLAB_CTOR_CONSTRUCTOR)
438 inode_init_once(&i->vfs_inode);
439}
440
441static int __init init_hfs_fs(void)
442{
443 int err;
444
445 hfs_inode_cachep = kmem_cache_create("hfs_inode_cache",
446 sizeof(struct hfs_inode_info), 0, SLAB_HWCACHE_ALIGN,
447 hfs_init_once, NULL);
448 if (!hfs_inode_cachep)
449 return -ENOMEM;
450 err = register_filesystem(&hfs_fs_type);
451 if (err)
452 kmem_cache_destroy(hfs_inode_cachep);
453 return err;
454}
455
456static void __exit exit_hfs_fs(void)
457{
458 unregister_filesystem(&hfs_fs_type);
459 if (kmem_cache_destroy(hfs_inode_cachep))
Roman Zippel7cf3cc32006-01-18 17:43:07 -0800460 printk(KERN_ERR "hfs_inode_cache: not all structures were freed\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461}
462
463module_init(init_hfs_fs)
464module_exit(exit_hfs_fs)