blob: eee7206c38d18e1a3d3b1697fd429763e3fe9f5b [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
Robert P. J. Day14b30d62008-02-06 01:37:10 -08009 * init_hfs_fs() and exit_hfs_fs(). The remaining super_ops are in
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 * inode.c since they deal with inodes.
11 *
12 * Based on the minix file system code, (C) 1991, 1992 by Linus Torvalds
13 */
14
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/module.h>
16#include <linux/blkdev.h>
Roman Zippel717dd80e2005-09-06 15:18:48 -070017#include <linux/mount.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include <linux/init.h>
Roman Zippel328b9222005-09-06 15:18:49 -070019#include <linux/nls.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <linux/parser.h>
Roman Zippel717dd80e2005-09-06 15:18:48 -070021#include <linux/seq_file.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090022#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <linux/vfs.h>
24
25#include "hfs_fs.h"
26#include "btree.h"
27
Christoph Lametere18b8902006-12-06 20:33:20 -080028static struct kmem_cache *hfs_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -070029
30MODULE_LICENSE("GPL");
31
Christoph Hellwig58bc5bb2009-06-08 10:04:54 +020032static int hfs_sync_fs(struct super_block *sb, int wait)
33{
Christoph Hellwig58bc5bb2009-06-08 10:04:54 +020034 hfs_mdb_commit(sb);
Christoph Hellwig58bc5bb2009-06-08 10:04:54 +020035 return 0;
36}
37
Linus Torvalds1da177e2005-04-16 15:20:36 -070038/*
39 * hfs_put_super()
40 *
41 * This is the put_super() entry in the super_operations structure for
42 * HFS filesystems. The purpose is to release the resources
43 * associated with the superblock sb.
44 */
45static void hfs_put_super(struct super_block *sb)
46{
Artem Bityutskiy5687b572012-07-12 17:28:49 +030047 cancel_delayed_work_sync(&HFS_SB(sb)->mdb_work);
Linus Torvalds1da177e2005-04-16 15:20:36 -070048 hfs_mdb_close(sb);
49 /* release the MDB's resources */
50 hfs_mdb_put(sb);
51}
52
Artem Bityutskiy5687b572012-07-12 17:28:49 +030053static 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070085/*
86 * hfs_statfs()
87 *
88 * This is the statfs() entry in the super_operations structure for
89 * HFS filesystems. The purpose is to return various data about the
90 * filesystem.
91 *
92 * changed f_files/f_ffree to reflect the fs_ablock/free_ablocks.
93 */
David Howells726c3342006-06-23 02:02:58 -070094static int hfs_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -070095{
David Howells726c3342006-06-23 02:02:58 -070096 struct super_block *sb = dentry->d_sb;
Coly Li7dd2c002009-04-02 16:59:35 -070097 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
David Howells726c3342006-06-23 02:02:58 -070098
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 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;
Coly Li7dd2c002009-04-02 16:59:35 -0700106 buf->f_fsid.val[0] = (u32)id;
107 buf->f_fsid.val[1] = (u32)(id >> 32);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 buf->f_namelen = HFS_NAMELEN;
109
110 return 0;
111}
112
113static int hfs_remount(struct super_block *sb, int *flags, char *data)
114{
Theodore Ts'o02b99842014-03-13 10:14:33 -0400115 sync_filesystem(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 *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))) {
Joe Perchesd6142672013-04-30 15:27:55 -0700121 pr_warn("filesystem was not cleanly unmounted, running fsck.hfs is recommended. leaving read-only.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 sb->s_flags |= MS_RDONLY;
123 *flags |= MS_RDONLY;
124 } else if (HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_SLOCK)) {
Joe Perchesd6142672013-04-30 15:27:55 -0700125 pr_warn("filesystem is marked locked, leaving read-only.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 sb->s_flags |= MS_RDONLY;
127 *flags |= MS_RDONLY;
128 }
129 }
130 return 0;
131}
132
Al Viro34c80b12011-12-08 21:32:45 -0500133static int hfs_show_options(struct seq_file *seq, struct dentry *root)
Roman Zippel717dd80e2005-09-06 15:18:48 -0700134{
Al Viro34c80b12011-12-08 21:32:45 -0500135 struct hfs_sb_info *sbi = HFS_SB(root->d_sb);
Roman Zippel717dd80e2005-09-06 15:18:48 -0700136
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);
Eric W. Biederman43b5e4c2012-02-07 16:26:59 -0800141 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));
Roman Zippel717dd80e2005-09-06 15:18:48 -0700144 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);
Roman Zippel328b9222005-09-06 15:18:49 -0700152 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);
Roman Zippel717dd80e2005-09-06 15:18:48 -0700156 if (sbi->s_quiet)
157 seq_printf(seq, ",quiet");
158 return 0;
159}
160
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161static struct inode *hfs_alloc_inode(struct super_block *sb)
162{
163 struct hfs_inode_info *i;
164
Christoph Lametere94b1762006-12-06 20:33:17 -0800165 i = kmem_cache_alloc(hfs_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 return i ? &i->vfs_inode : NULL;
167}
168
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100169static void hfs_i_callback(struct rcu_head *head)
170{
171 struct inode *inode = container_of(head, struct inode, i_rcu);
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100172 kmem_cache_free(hfs_inode_cachep, HFS_I(inode));
173}
174
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175static void hfs_destroy_inode(struct inode *inode)
176{
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100177 call_rcu(&inode->i_rcu, hfs_i_callback);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178}
179
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800180static const struct super_operations hfs_super_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 .alloc_inode = hfs_alloc_inode,
182 .destroy_inode = hfs_destroy_inode,
183 .write_inode = hfs_write_inode,
Al Virob57922d2010-06-07 14:34:48 -0400184 .evict_inode = hfs_evict_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 .put_super = hfs_put_super,
Christoph Hellwig58bc5bb2009-06-08 10:04:54 +0200186 .sync_fs = hfs_sync_fs,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 .statfs = hfs_statfs,
188 .remount_fs = hfs_remount,
Roman Zippel717dd80e2005-09-06 15:18:48 -0700189 .show_options = hfs_show_options,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190};
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,
Roman Zippel328b9222005-09-06 15:18:49 -0700195 opt_codepage, opt_iocharset,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 opt_err
197};
198
Steven Whitehousea447c092008-10-13 10:46:57 +0100199static const match_table_t tokens = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 { 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" },
Roman Zippel328b9222005-09-06 15:18:49 -0700210 { opt_codepage, "codepage=%s" },
211 { opt_iocharset, "iocharset=%s" },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 { 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 * parse_options()
225 *
226 * adapted from linux/fs/msdos/inode.c written 1992,93 by Werner Almesberger
227 * This function is called by hfs_read_super() to parse the mount options.
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 /* initialize the sb with defaults */
David Howells94c9a5e2008-11-14 10:38:54 +1100236 hsb->s_uid = current_uid();
237 hsb->s_gid = current_gid();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 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)) {
Joe Perchesd6142672013-04-30 15:27:55 -0700256 pr_err("uid requires an argument\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 return 0;
258 }
Eric W. Biederman43b5e4c2012-02-07 16:26:59 -0800259 hsb->s_uid = make_kuid(current_user_ns(), (uid_t)tmp);
260 if (!uid_valid(hsb->s_uid)) {
Joe Perchesd6142672013-04-30 15:27:55 -0700261 pr_err("invalid uid %d\n", tmp);
Eric W. Biederman43b5e4c2012-02-07 16:26:59 -0800262 return 0;
263 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 break;
265 case opt_gid:
266 if (match_int(&args[0], &tmp)) {
Joe Perchesd6142672013-04-30 15:27:55 -0700267 pr_err("gid requires an argument\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 return 0;
269 }
Eric W. Biederman43b5e4c2012-02-07 16:26:59 -0800270 hsb->s_gid = make_kgid(current_user_ns(), (gid_t)tmp);
271 if (!gid_valid(hsb->s_gid)) {
Joe Perchesd6142672013-04-30 15:27:55 -0700272 pr_err("invalid gid %d\n", tmp);
Eric W. Biederman43b5e4c2012-02-07 16:26:59 -0800273 return 0;
274 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 break;
276 case opt_umask:
277 if (match_octal(&args[0], &tmp)) {
Joe Perchesd6142672013-04-30 15:27:55 -0700278 pr_err("umask requires a value\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 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)) {
Joe Perchesd6142672013-04-30 15:27:55 -0700286 pr_err("file_umask requires a value\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 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)) {
Joe Perchesd6142672013-04-30 15:27:55 -0700293 pr_err("dir_umask requires a value\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 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)) {
Joe Perchesd6142672013-04-30 15:27:55 -0700300 pr_err("part requires an argument\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301 return 0;
302 }
303 break;
304 case opt_session:
305 if (match_int(&args[0], &hsb->session)) {
Joe Perchesd6142672013-04-30 15:27:55 -0700306 pr_err("session requires an argument\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 return 0;
308 }
309 break;
310 case opt_type:
311 if (match_fourchar(&args[0], &hsb->s_type)) {
Joe Perchesd6142672013-04-30 15:27:55 -0700312 pr_err("type requires a 4 character value\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 return 0;
314 }
315 break;
316 case opt_creator:
317 if (match_fourchar(&args[0], &hsb->s_creator)) {
Joe Perchesd6142672013-04-30 15:27:55 -0700318 pr_err("creator requires a 4 character value\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 return 0;
320 }
321 break;
322 case opt_quiet:
323 hsb->s_quiet = 1;
324 break;
Roman Zippel328b9222005-09-06 15:18:49 -0700325 case opt_codepage:
326 if (hsb->nls_disk) {
Joe Perchesd6142672013-04-30 15:27:55 -0700327 pr_err("unable to change codepage\n");
Roman Zippel328b9222005-09-06 15:18:49 -0700328 return 0;
329 }
330 p = match_strdup(&args[0]);
Jim Meyering3fbe5c32008-04-29 00:59:07 -0700331 if (p)
332 hsb->nls_disk = load_nls(p);
Roman Zippel328b9222005-09-06 15:18:49 -0700333 if (!hsb->nls_disk) {
Joe Perchesd6142672013-04-30 15:27:55 -0700334 pr_err("unable to load codepage \"%s\"\n", p);
Roman Zippel328b9222005-09-06 15:18:49 -0700335 kfree(p);
336 return 0;
337 }
338 kfree(p);
339 break;
340 case opt_iocharset:
341 if (hsb->nls_io) {
Joe Perchesd6142672013-04-30 15:27:55 -0700342 pr_err("unable to change iocharset\n");
Roman Zippel328b9222005-09-06 15:18:49 -0700343 return 0;
344 }
345 p = match_strdup(&args[0]);
Jim Meyering3fbe5c32008-04-29 00:59:07 -0700346 if (p)
347 hsb->nls_io = load_nls(p);
Roman Zippel328b9222005-09-06 15:18:49 -0700348 if (!hsb->nls_io) {
Joe Perchesd6142672013-04-30 15:27:55 -0700349 pr_err("unable to load iocharset \"%s\"\n", p);
Roman Zippel328b9222005-09-06 15:18:49 -0700350 kfree(p);
351 return 0;
352 }
353 kfree(p);
354 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 default:
356 return 0;
357 }
358 }
359
Roman Zippel328b9222005-09-06 15:18:49 -0700360 if (hsb->nls_disk && !hsb->nls_io) {
361 hsb->nls_io = load_nls_default();
362 if (!hsb->nls_io) {
Joe Perchesd6142672013-04-30 15:27:55 -0700363 pr_err("unable to load default iocharset\n");
Roman Zippel328b9222005-09-06 15:18:49 -0700364 return 0;
365 }
366 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367 hsb->s_dir_umask &= 0777;
368 hsb->s_file_umask &= 0577;
369
370 return 1;
371}
372
373/*
374 * hfs_read_super()
375 *
376 * This is the function that is responsible for mounting an HFS
377 * filesystem. It performs all the tasks necessary to get enough data
378 * from the disk to read the root inode. This includes parsing the
379 * mount options, dealing with Macintosh partitions, reading the
380 * superblock and the allocation bitmap blocks, calling
381 * hfs_btree_init() to get the necessary data about the extents and
382 * catalog B-trees and, finally, reading the root inode into memory.
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
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700392 sbi = kzalloc(sizeof(struct hfs_sb_info), GFP_KERNEL);
Jan Blunck8526fb32010-02-24 13:25:30 +0100393 if (!sbi)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 return -ENOMEM;
Jan Blunck8526fb32010-02-24 13:25:30 +0100395
Artem Bityutskiyb16ca622012-07-12 17:28:48 +0300396 sbi->sb = sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 sb->s_fs_info = sbi;
Artem Bityutskiy5687b572012-07-12 17:28:49 +0300398 spin_lock_init(&sbi->work_lock);
399 INIT_DELAYED_WORK(&sbi->mdb_work, flush_mdb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400
401 res = -EINVAL;
402 if (!parse_options((char *)data, sbi)) {
Joe Perchesd6142672013-04-30 15:27:55 -0700403 pr_err("unable to parse mount options\n");
Colin Leroy945b0922005-05-01 08:59:16 -0700404 goto bail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 }
406
407 sb->s_op = &hfs_super_operations;
408 sb->s_flags |= MS_NODIRATIME;
Matthias Kaehlcke3084b722008-07-25 01:46:34 -0700409 mutex_init(&sbi->bitmap_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410
411 res = hfs_mdb_get(sb);
412 if (res) {
413 if (!silent)
Joe Perchesd6142672013-04-30 15:27:55 -0700414 pr_warn("can't find a HFS filesystem on dev %s\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 hfs_mdb_name(sb));
416 res = -EINVAL;
Colin Leroy945b0922005-05-01 08:59:16 -0700417 goto bail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 }
419
420 /* try to get the root inode */
Alexey Khoroshilov9509f172013-04-30 15:27:52 -0700421 res = hfs_find_init(HFS_SB(sb)->cat_tree, &fd);
422 if (res)
423 goto bail_no_root;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 res = hfs_cat_find_brec(sb, HFS_ROOT_CNID, &fd);
Amerigo Wangec81aec2009-12-14 17:57:37 -0800425 if (!res) {
426 if (fd.entrylength > sizeof(rec) || fd.entrylength < 0) {
427 res = -EIO;
428 goto bail;
429 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, fd.entrylength);
Amerigo Wangec81aec2009-12-14 17:57:37 -0800431 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 if (res) {
433 hfs_find_exit(&fd);
434 goto bail_no_root;
435 }
Eric Sandeend6ddf552006-11-16 01:19:22 -0800436 res = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 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
Al Viro518c79d2010-12-18 11:19:14 -0500442 sb->s_d_op = &hfs_dentry_operations;
Eric Sandeend6ddf552006-11-16 01:19:22 -0800443 res = -ENOMEM;
Al Viro48fde702012-01-08 22:15:13 -0500444 sb->s_root = d_make_root(root_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 if (!sb->s_root)
Al Viro48fde702012-01-08 22:15:13 -0500446 goto bail_no_root;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 /* everything's okay */
449 return 0;
450
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451bail_no_root:
Joe Perchesd6142672013-04-30 15:27:55 -0700452 pr_err("get root inode failed\n");
Colin Leroy945b0922005-05-01 08:59:16 -0700453bail:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 hfs_mdb_put(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 return res;
456}
457
Al Viro152a0832010-07-25 00:46:55 +0400458static struct dentry *hfs_mount(struct file_system_type *fs_type,
459 int flags, const char *dev_name, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460{
Al Viro152a0832010-07-25 00:46:55 +0400461 return mount_bdev(fs_type, flags, dev_name, data, hfs_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462}
463
464static struct file_system_type hfs_fs_type = {
465 .owner = THIS_MODULE,
466 .name = "hfs",
Al Viro152a0832010-07-25 00:46:55 +0400467 .mount = hfs_mount,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468 .kill_sb = kill_block_super,
469 .fs_flags = FS_REQUIRES_DEV,
470};
Eric W. Biederman7f78e032013-03-02 19:39:14 -0800471MODULE_ALIAS_FS("hfs");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700473static void hfs_init_once(void *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474{
475 struct hfs_inode_info *i = p;
476
Christoph Lametera35afb82007-05-16 22:10:57 -0700477 inode_init_once(&i->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478}
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,
Paul Mundt20c2df82007-07-20 10:11:58 +0900486 hfs_init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 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);
Kirill A. Shutemov8c0a8532012-09-26 11:33:07 +1000498
499 /*
500 * Make sure all delayed rcu free inodes are flushed before we
501 * destroy cache.
502 */
503 rcu_barrier();
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -0700504 kmem_cache_destroy(hfs_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505}
506
507module_init(init_hfs_fs)
508module_exit(exit_hfs_fs)