blob: c5074aeafcae7e8bebaf55780e1548692cdad78b [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 Zippel717dd80e2005-09-06 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 Zippel717dd80e2005-09-06 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 */
83static int hfs_statfs(struct super_block *sb, struct kstatfs *buf)
84{
85 buf->f_type = HFS_SUPER_MAGIC;
86 buf->f_bsize = sb->s_blocksize;
87 buf->f_blocks = (u32)HFS_SB(sb)->fs_ablocks * HFS_SB(sb)->fs_div;
88 buf->f_bfree = (u32)HFS_SB(sb)->free_ablocks * HFS_SB(sb)->fs_div;
89 buf->f_bavail = buf->f_bfree;
90 buf->f_files = HFS_SB(sb)->fs_ablocks;
91 buf->f_ffree = HFS_SB(sb)->free_ablocks;
92 buf->f_namelen = HFS_NAMELEN;
93
94 return 0;
95}
96
97static int hfs_remount(struct super_block *sb, int *flags, char *data)
98{
99 *flags |= MS_NODIRATIME;
100 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
101 return 0;
102 if (!(*flags & MS_RDONLY)) {
103 if (!(HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_UNMNT))) {
104 printk("HFS-fs warning: Filesystem was not cleanly unmounted, "
105 "running fsck.hfs is recommended. leaving read-only.\n");
106 sb->s_flags |= MS_RDONLY;
107 *flags |= MS_RDONLY;
108 } else if (HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_SLOCK)) {
109 printk("HFS-fs: Filesystem is marked locked, leaving read-only.\n");
110 sb->s_flags |= MS_RDONLY;
111 *flags |= MS_RDONLY;
112 }
113 }
114 return 0;
115}
116
Roman Zippel717dd80e2005-09-06 15:18:48 -0700117static int hfs_show_options(struct seq_file *seq, struct vfsmount *mnt)
118{
119 struct hfs_sb_info *sbi = HFS_SB(mnt->mnt_sb);
120
121 if (sbi->s_creator != cpu_to_be32(0x3f3f3f3f))
122 seq_printf(seq, ",creator=%.4s", (char *)&sbi->s_creator);
123 if (sbi->s_type != cpu_to_be32(0x3f3f3f3f))
124 seq_printf(seq, ",type=%.4s", (char *)&sbi->s_type);
125 seq_printf(seq, ",uid=%u,gid=%u", sbi->s_uid, sbi->s_gid);
126 if (sbi->s_file_umask != 0133)
127 seq_printf(seq, ",file_umask=%o", sbi->s_file_umask);
128 if (sbi->s_dir_umask != 0022)
129 seq_printf(seq, ",dir_umask=%o", sbi->s_dir_umask);
130 if (sbi->part >= 0)
131 seq_printf(seq, ",part=%u", sbi->part);
132 if (sbi->session >= 0)
133 seq_printf(seq, ",session=%u", sbi->session);
Roman Zippel328b9222005-09-06 15:18:49 -0700134 if (sbi->nls_disk)
135 seq_printf(seq, ",codepage=%s", sbi->nls_disk->charset);
136 if (sbi->nls_io)
137 seq_printf(seq, ",iocharset=%s", sbi->nls_io->charset);
Roman Zippel717dd80e2005-09-06 15:18:48 -0700138 if (sbi->s_quiet)
139 seq_printf(seq, ",quiet");
140 return 0;
141}
142
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143static struct inode *hfs_alloc_inode(struct super_block *sb)
144{
145 struct hfs_inode_info *i;
146
147 i = kmem_cache_alloc(hfs_inode_cachep, SLAB_KERNEL);
148 return i ? &i->vfs_inode : NULL;
149}
150
151static void hfs_destroy_inode(struct inode *inode)
152{
153 kmem_cache_free(hfs_inode_cachep, HFS_I(inode));
154}
155
156static struct super_operations hfs_super_operations = {
157 .alloc_inode = hfs_alloc_inode,
158 .destroy_inode = hfs_destroy_inode,
159 .write_inode = hfs_write_inode,
160 .clear_inode = hfs_clear_inode,
161 .put_super = hfs_put_super,
162 .write_super = hfs_write_super,
163 .statfs = hfs_statfs,
164 .remount_fs = hfs_remount,
Roman Zippel717dd80e2005-09-06 15:18:48 -0700165 .show_options = hfs_show_options,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166};
167
168enum {
169 opt_uid, opt_gid, opt_umask, opt_file_umask, opt_dir_umask,
170 opt_part, opt_session, opt_type, opt_creator, opt_quiet,
Roman Zippel328b9222005-09-06 15:18:49 -0700171 opt_codepage, opt_iocharset,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 opt_err
173};
174
175static match_table_t tokens = {
176 { opt_uid, "uid=%u" },
177 { opt_gid, "gid=%u" },
178 { opt_umask, "umask=%o" },
179 { opt_file_umask, "file_umask=%o" },
180 { opt_dir_umask, "dir_umask=%o" },
181 { opt_part, "part=%u" },
182 { opt_session, "session=%u" },
183 { opt_type, "type=%s" },
184 { opt_creator, "creator=%s" },
185 { opt_quiet, "quiet" },
Roman Zippel328b9222005-09-06 15:18:49 -0700186 { opt_codepage, "codepage=%s" },
187 { opt_iocharset, "iocharset=%s" },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 { opt_err, NULL }
189};
190
191static inline int match_fourchar(substring_t *arg, u32 *result)
192{
193 if (arg->to - arg->from != 4)
194 return -EINVAL;
195 memcpy(result, arg->from, 4);
196 return 0;
197}
198
199/*
200 * parse_options()
201 *
202 * adapted from linux/fs/msdos/inode.c written 1992,93 by Werner Almesberger
203 * This function is called by hfs_read_super() to parse the mount options.
204 */
205static int parse_options(char *options, struct hfs_sb_info *hsb)
206{
207 char *p;
208 substring_t args[MAX_OPT_ARGS];
209 int tmp, token;
210
211 /* initialize the sb with defaults */
212 hsb->s_uid = current->uid;
213 hsb->s_gid = current->gid;
214 hsb->s_file_umask = 0133;
215 hsb->s_dir_umask = 0022;
216 hsb->s_type = hsb->s_creator = cpu_to_be32(0x3f3f3f3f); /* == '????' */
217 hsb->s_quiet = 0;
218 hsb->part = -1;
219 hsb->session = -1;
220
221 if (!options)
222 return 1;
223
224 while ((p = strsep(&options, ",")) != NULL) {
225 if (!*p)
226 continue;
227
228 token = match_token(p, tokens, args);
229 switch (token) {
230 case opt_uid:
231 if (match_int(&args[0], &tmp)) {
232 printk("HFS: uid requires an argument\n");
233 return 0;
234 }
235 hsb->s_uid = (uid_t)tmp;
236 break;
237 case opt_gid:
238 if (match_int(&args[0], &tmp)) {
239 printk("HFS: gid requires an argument\n");
240 return 0;
241 }
242 hsb->s_gid = (gid_t)tmp;
243 break;
244 case opt_umask:
245 if (match_octal(&args[0], &tmp)) {
246 printk("HFS: umask requires a value\n");
247 return 0;
248 }
249 hsb->s_file_umask = (umode_t)tmp;
250 hsb->s_dir_umask = (umode_t)tmp;
251 break;
252 case opt_file_umask:
253 if (match_octal(&args[0], &tmp)) {
254 printk("HFS: file_umask requires a value\n");
255 return 0;
256 }
257 hsb->s_file_umask = (umode_t)tmp;
258 break;
259 case opt_dir_umask:
260 if (match_octal(&args[0], &tmp)) {
261 printk("HFS: dir_umask requires a value\n");
262 return 0;
263 }
264 hsb->s_dir_umask = (umode_t)tmp;
265 break;
266 case opt_part:
267 if (match_int(&args[0], &hsb->part)) {
268 printk("HFS: part requires an argument\n");
269 return 0;
270 }
271 break;
272 case opt_session:
273 if (match_int(&args[0], &hsb->session)) {
274 printk("HFS: session requires an argument\n");
275 return 0;
276 }
277 break;
278 case opt_type:
279 if (match_fourchar(&args[0], &hsb->s_type)) {
280 printk("HFS+-fs: type requires a 4 character value\n");
281 return 0;
282 }
283 break;
284 case opt_creator:
285 if (match_fourchar(&args[0], &hsb->s_creator)) {
286 printk("HFS+-fs: creator requires a 4 character value\n");
287 return 0;
288 }
289 break;
290 case opt_quiet:
291 hsb->s_quiet = 1;
292 break;
Roman Zippel328b9222005-09-06 15:18:49 -0700293 case opt_codepage:
294 if (hsb->nls_disk) {
295 printk("HFS+-fs: unable to change codepage\n");
296 return 0;
297 }
298 p = match_strdup(&args[0]);
299 hsb->nls_disk = load_nls(p);
300 if (!hsb->nls_disk) {
301 printk("HFS+-fs: unable to load codepage \"%s\"\n", p);
302 kfree(p);
303 return 0;
304 }
305 kfree(p);
306 break;
307 case opt_iocharset:
308 if (hsb->nls_io) {
309 printk("HFS: unable to change iocharset\n");
310 return 0;
311 }
312 p = match_strdup(&args[0]);
313 hsb->nls_io = load_nls(p);
314 if (!hsb->nls_io) {
315 printk("HFS: unable to load iocharset \"%s\"\n", p);
316 kfree(p);
317 return 0;
318 }
319 kfree(p);
320 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 default:
322 return 0;
323 }
324 }
325
Roman Zippel328b9222005-09-06 15:18:49 -0700326 if (hsb->nls_disk && !hsb->nls_io) {
327 hsb->nls_io = load_nls_default();
328 if (!hsb->nls_io) {
329 printk("HFS: unable to load default iocharset\n");
330 return 0;
331 }
332 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 hsb->s_dir_umask &= 0777;
334 hsb->s_file_umask &= 0577;
335
336 return 1;
337}
338
339/*
340 * hfs_read_super()
341 *
342 * This is the function that is responsible for mounting an HFS
343 * filesystem. It performs all the tasks necessary to get enough data
344 * from the disk to read the root inode. This includes parsing the
345 * mount options, dealing with Macintosh partitions, reading the
346 * superblock and the allocation bitmap blocks, calling
347 * hfs_btree_init() to get the necessary data about the extents and
348 * catalog B-trees and, finally, reading the root inode into memory.
349 */
350static int hfs_fill_super(struct super_block *sb, void *data, int silent)
351{
352 struct hfs_sb_info *sbi;
353 struct hfs_find_data fd;
354 hfs_cat_rec rec;
355 struct inode *root_inode;
356 int res;
357
358 sbi = kmalloc(sizeof(struct hfs_sb_info), GFP_KERNEL);
359 if (!sbi)
360 return -ENOMEM;
361 sb->s_fs_info = sbi;
362 memset(sbi, 0, sizeof(struct hfs_sb_info));
363 INIT_HLIST_HEAD(&sbi->rsrc_inodes);
364
365 res = -EINVAL;
366 if (!parse_options((char *)data, sbi)) {
367 hfs_warn("hfs_fs: unable to parse mount options.\n");
Colin Leroy945b0922005-05-01 08:59:16 -0700368 goto bail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 }
370
371 sb->s_op = &hfs_super_operations;
372 sb->s_flags |= MS_NODIRATIME;
373 init_MUTEX(&sbi->bitmap_lock);
374
375 res = hfs_mdb_get(sb);
376 if (res) {
377 if (!silent)
378 hfs_warn("VFS: Can't find a HFS filesystem on dev %s.\n",
379 hfs_mdb_name(sb));
380 res = -EINVAL;
Colin Leroy945b0922005-05-01 08:59:16 -0700381 goto bail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 }
383
384 /* try to get the root inode */
385 hfs_find_init(HFS_SB(sb)->cat_tree, &fd);
386 res = hfs_cat_find_brec(sb, HFS_ROOT_CNID, &fd);
387 if (!res)
388 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, fd.entrylength);
389 if (res) {
390 hfs_find_exit(&fd);
391 goto bail_no_root;
392 }
393 root_inode = hfs_iget(sb, &fd.search_key->cat, &rec);
394 hfs_find_exit(&fd);
395 if (!root_inode)
396 goto bail_no_root;
397
398 sb->s_root = d_alloc_root(root_inode);
399 if (!sb->s_root)
400 goto bail_iput;
401
402 sb->s_root->d_op = &hfs_dentry_operations;
403
404 /* everything's okay */
405 return 0;
406
407bail_iput:
408 iput(root_inode);
409bail_no_root:
410 hfs_warn("hfs_fs: get root inode failed.\n");
Colin Leroy945b0922005-05-01 08:59:16 -0700411bail:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 hfs_mdb_put(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 return res;
414}
415
416static struct super_block *hfs_get_sb(struct file_system_type *fs_type,
417 int flags, const char *dev_name, void *data)
418{
419 return get_sb_bdev(fs_type, flags, dev_name, data, hfs_fill_super);
420}
421
422static struct file_system_type hfs_fs_type = {
423 .owner = THIS_MODULE,
424 .name = "hfs",
425 .get_sb = hfs_get_sb,
426 .kill_sb = kill_block_super,
427 .fs_flags = FS_REQUIRES_DEV,
428};
429
430static void hfs_init_once(void *p, kmem_cache_t *cachep, unsigned long flags)
431{
432 struct hfs_inode_info *i = p;
433
434 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == SLAB_CTOR_CONSTRUCTOR)
435 inode_init_once(&i->vfs_inode);
436}
437
438static int __init init_hfs_fs(void)
439{
440 int err;
441
442 hfs_inode_cachep = kmem_cache_create("hfs_inode_cache",
443 sizeof(struct hfs_inode_info), 0, SLAB_HWCACHE_ALIGN,
444 hfs_init_once, NULL);
445 if (!hfs_inode_cachep)
446 return -ENOMEM;
447 err = register_filesystem(&hfs_fs_type);
448 if (err)
449 kmem_cache_destroy(hfs_inode_cachep);
450 return err;
451}
452
453static void __exit exit_hfs_fs(void)
454{
455 unregister_filesystem(&hfs_fs_type);
456 if (kmem_cache_destroy(hfs_inode_cachep))
457 printk(KERN_INFO "hfs_inode_cache: not all structures were freed\n");
458}
459
460module_init(init_hfs_fs)
461module_exit(exit_hfs_fs)