blob: 1ca95c232bb5c7d071250f46bed489a73b807abd [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>
Tejun Heo66114ca2015-05-22 17:13:32 -040017#include <linux/backing-dev.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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090023#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include <linux/vfs.h>
25
26#include "hfs_fs.h"
27#include "btree.h"
28
Christoph Lametere18b8902006-12-06 20:33:20 -080029static struct kmem_cache *hfs_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -070030
31MODULE_LICENSE("GPL");
32
Christoph Hellwig58bc5bb2009-06-08 10:04:54 +020033static int hfs_sync_fs(struct super_block *sb, int wait)
34{
Christoph Hellwig58bc5bb2009-06-08 10:04:54 +020035 hfs_mdb_commit(sb);
Christoph Hellwig58bc5bb2009-06-08 10:04:54 +020036 return 0;
37}
38
Linus Torvalds1da177e2005-04-16 15:20:36 -070039/*
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{
Artem Bityutskiy5687b572012-07-12 17:28:49 +030048 cancel_delayed_work_sync(&HFS_SB(sb)->mdb_work);
Linus Torvalds1da177e2005-04-16 15:20:36 -070049 hfs_mdb_close(sb);
50 /* release the MDB's resources */
51 hfs_mdb_put(sb);
52}
53
Artem Bityutskiy5687b572012-07-12 17:28:49 +030054static 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->s_flags & MS_RDONLY)
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070086/*
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 */
David Howells726c3342006-06-23 02:02:58 -070095static int hfs_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -070096{
David Howells726c3342006-06-23 02:02:58 -070097 struct super_block *sb = dentry->d_sb;
Coly Li7dd2c002009-04-02 16:59:35 -070098 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
David Howells726c3342006-06-23 02:02:58 -070099
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 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;
Coly Li7dd2c002009-04-02 16:59:35 -0700107 buf->f_fsid.val[0] = (u32)id;
108 buf->f_fsid.val[1] = (u32)(id >> 32);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 buf->f_namelen = HFS_NAMELEN;
110
111 return 0;
112}
113
114static int hfs_remount(struct super_block *sb, int *flags, char *data)
115{
Theodore Ts'o02b99842014-03-13 10:14:33 -0400116 sync_filesystem(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 *flags |= MS_NODIRATIME;
118 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
119 return 0;
120 if (!(*flags & MS_RDONLY)) {
121 if (!(HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_UNMNT))) {
Joe Perchesd6142672013-04-30 15:27:55 -0700122 pr_warn("filesystem was not cleanly unmounted, running fsck.hfs is recommended. leaving read-only.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 sb->s_flags |= MS_RDONLY;
124 *flags |= MS_RDONLY;
125 } else if (HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_SLOCK)) {
Joe Perchesd6142672013-04-30 15:27:55 -0700126 pr_warn("filesystem is marked locked, leaving read-only.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 sb->s_flags |= MS_RDONLY;
128 *flags |= MS_RDONLY;
129 }
130 }
131 return 0;
132}
133
Al Viro34c80b12011-12-08 21:32:45 -0500134static int hfs_show_options(struct seq_file *seq, struct dentry *root)
Roman Zippel717dd80e2005-09-06 15:18:48 -0700135{
Al Viro34c80b12011-12-08 21:32:45 -0500136 struct hfs_sb_info *sbi = HFS_SB(root->d_sb);
Roman Zippel717dd80e2005-09-06 15:18:48 -0700137
138 if (sbi->s_creator != cpu_to_be32(0x3f3f3f3f))
Kees Cooka068acf2015-09-04 15:44:57 -0700139 seq_show_option_n(seq, "creator", (char *)&sbi->s_creator, 4);
Roman Zippel717dd80e2005-09-06 15:18:48 -0700140 if (sbi->s_type != cpu_to_be32(0x3f3f3f3f))
Kees Cooka068acf2015-09-04 15:44:57 -0700141 seq_show_option_n(seq, "type", (char *)&sbi->s_type, 4);
Eric W. Biederman43b5e4c2012-02-07 16:26:59 -0800142 seq_printf(seq, ",uid=%u,gid=%u",
143 from_kuid_munged(&init_user_ns, sbi->s_uid),
144 from_kgid_munged(&init_user_ns, sbi->s_gid));
Roman Zippel717dd80e2005-09-06 15:18:48 -0700145 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);
Roman Zippel328b9222005-09-06 15:18:49 -0700153 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);
Roman Zippel717dd80e2005-09-06 15:18:48 -0700157 if (sbi->s_quiet)
158 seq_printf(seq, ",quiet");
159 return 0;
160}
161
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162static struct inode *hfs_alloc_inode(struct super_block *sb)
163{
164 struct hfs_inode_info *i;
165
Christoph Lametere94b1762006-12-06 20:33:17 -0800166 i = kmem_cache_alloc(hfs_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 return i ? &i->vfs_inode : NULL;
168}
169
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100170static void hfs_i_callback(struct rcu_head *head)
171{
172 struct inode *inode = container_of(head, struct inode, i_rcu);
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100173 kmem_cache_free(hfs_inode_cachep, HFS_I(inode));
174}
175
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176static void hfs_destroy_inode(struct inode *inode)
177{
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100178 call_rcu(&inode->i_rcu, hfs_i_callback);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179}
180
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800181static const struct super_operations hfs_super_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 .alloc_inode = hfs_alloc_inode,
183 .destroy_inode = hfs_destroy_inode,
184 .write_inode = hfs_write_inode,
Al Virob57922d2010-06-07 14:34:48 -0400185 .evict_inode = hfs_evict_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 .put_super = hfs_put_super,
Christoph Hellwig58bc5bb2009-06-08 10:04:54 +0200187 .sync_fs = hfs_sync_fs,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 .statfs = hfs_statfs,
189 .remount_fs = hfs_remount,
Roman Zippel717dd80e2005-09-06 15:18:48 -0700190 .show_options = hfs_show_options,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191};
192
193enum {
194 opt_uid, opt_gid, opt_umask, opt_file_umask, opt_dir_umask,
195 opt_part, opt_session, opt_type, opt_creator, opt_quiet,
Roman Zippel328b9222005-09-06 15:18:49 -0700196 opt_codepage, opt_iocharset,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 opt_err
198};
199
Steven Whitehousea447c092008-10-13 10:46:57 +0100200static const match_table_t tokens = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 { opt_uid, "uid=%u" },
202 { opt_gid, "gid=%u" },
203 { opt_umask, "umask=%o" },
204 { opt_file_umask, "file_umask=%o" },
205 { opt_dir_umask, "dir_umask=%o" },
206 { opt_part, "part=%u" },
207 { opt_session, "session=%u" },
208 { opt_type, "type=%s" },
209 { opt_creator, "creator=%s" },
210 { opt_quiet, "quiet" },
Roman Zippel328b9222005-09-06 15:18:49 -0700211 { opt_codepage, "codepage=%s" },
212 { opt_iocharset, "iocharset=%s" },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 { opt_err, NULL }
214};
215
216static inline int match_fourchar(substring_t *arg, u32 *result)
217{
218 if (arg->to - arg->from != 4)
219 return -EINVAL;
220 memcpy(result, arg->from, 4);
221 return 0;
222}
223
224/*
225 * parse_options()
226 *
227 * adapted from linux/fs/msdos/inode.c written 1992,93 by Werner Almesberger
228 * This function is called by hfs_read_super() to parse the mount options.
229 */
230static int parse_options(char *options, struct hfs_sb_info *hsb)
231{
232 char *p;
233 substring_t args[MAX_OPT_ARGS];
234 int tmp, token;
235
236 /* initialize the sb with defaults */
David Howells94c9a5e2008-11-14 10:38:54 +1100237 hsb->s_uid = current_uid();
238 hsb->s_gid = current_gid();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 hsb->s_file_umask = 0133;
240 hsb->s_dir_umask = 0022;
241 hsb->s_type = hsb->s_creator = cpu_to_be32(0x3f3f3f3f); /* == '????' */
242 hsb->s_quiet = 0;
243 hsb->part = -1;
244 hsb->session = -1;
245
246 if (!options)
247 return 1;
248
249 while ((p = strsep(&options, ",")) != NULL) {
250 if (!*p)
251 continue;
252
253 token = match_token(p, tokens, args);
254 switch (token) {
255 case opt_uid:
256 if (match_int(&args[0], &tmp)) {
Joe Perchesd6142672013-04-30 15:27:55 -0700257 pr_err("uid requires an argument\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 return 0;
259 }
Eric W. Biederman43b5e4c2012-02-07 16:26:59 -0800260 hsb->s_uid = make_kuid(current_user_ns(), (uid_t)tmp);
261 if (!uid_valid(hsb->s_uid)) {
Joe Perchesd6142672013-04-30 15:27:55 -0700262 pr_err("invalid uid %d\n", tmp);
Eric W. Biederman43b5e4c2012-02-07 16:26:59 -0800263 return 0;
264 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 break;
266 case opt_gid:
267 if (match_int(&args[0], &tmp)) {
Joe Perchesd6142672013-04-30 15:27:55 -0700268 pr_err("gid requires an argument\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 return 0;
270 }
Eric W. Biederman43b5e4c2012-02-07 16:26:59 -0800271 hsb->s_gid = make_kgid(current_user_ns(), (gid_t)tmp);
272 if (!gid_valid(hsb->s_gid)) {
Joe Perchesd6142672013-04-30 15:27:55 -0700273 pr_err("invalid gid %d\n", tmp);
Eric W. Biederman43b5e4c2012-02-07 16:26:59 -0800274 return 0;
275 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 break;
277 case opt_umask:
278 if (match_octal(&args[0], &tmp)) {
Joe Perchesd6142672013-04-30 15:27:55 -0700279 pr_err("umask requires a value\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 return 0;
281 }
282 hsb->s_file_umask = (umode_t)tmp;
283 hsb->s_dir_umask = (umode_t)tmp;
284 break;
285 case opt_file_umask:
286 if (match_octal(&args[0], &tmp)) {
Joe Perchesd6142672013-04-30 15:27:55 -0700287 pr_err("file_umask requires a value\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 return 0;
289 }
290 hsb->s_file_umask = (umode_t)tmp;
291 break;
292 case opt_dir_umask:
293 if (match_octal(&args[0], &tmp)) {
Joe Perchesd6142672013-04-30 15:27:55 -0700294 pr_err("dir_umask requires a value\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 return 0;
296 }
297 hsb->s_dir_umask = (umode_t)tmp;
298 break;
299 case opt_part:
300 if (match_int(&args[0], &hsb->part)) {
Joe Perchesd6142672013-04-30 15:27:55 -0700301 pr_err("part requires an argument\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 return 0;
303 }
304 break;
305 case opt_session:
306 if (match_int(&args[0], &hsb->session)) {
Joe Perchesd6142672013-04-30 15:27:55 -0700307 pr_err("session requires an argument\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 return 0;
309 }
310 break;
311 case opt_type:
312 if (match_fourchar(&args[0], &hsb->s_type)) {
Joe Perchesd6142672013-04-30 15:27:55 -0700313 pr_err("type requires a 4 character value\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 return 0;
315 }
316 break;
317 case opt_creator:
318 if (match_fourchar(&args[0], &hsb->s_creator)) {
Joe Perchesd6142672013-04-30 15:27:55 -0700319 pr_err("creator requires a 4 character value\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 return 0;
321 }
322 break;
323 case opt_quiet:
324 hsb->s_quiet = 1;
325 break;
Roman Zippel328b9222005-09-06 15:18:49 -0700326 case opt_codepage:
327 if (hsb->nls_disk) {
Joe Perchesd6142672013-04-30 15:27:55 -0700328 pr_err("unable to change codepage\n");
Roman Zippel328b9222005-09-06 15:18:49 -0700329 return 0;
330 }
331 p = match_strdup(&args[0]);
Jim Meyering3fbe5c32008-04-29 00:59:07 -0700332 if (p)
333 hsb->nls_disk = load_nls(p);
Roman Zippel328b9222005-09-06 15:18:49 -0700334 if (!hsb->nls_disk) {
Joe Perchesd6142672013-04-30 15:27:55 -0700335 pr_err("unable to load codepage \"%s\"\n", p);
Roman Zippel328b9222005-09-06 15:18:49 -0700336 kfree(p);
337 return 0;
338 }
339 kfree(p);
340 break;
341 case opt_iocharset:
342 if (hsb->nls_io) {
Joe Perchesd6142672013-04-30 15:27:55 -0700343 pr_err("unable to change iocharset\n");
Roman Zippel328b9222005-09-06 15:18:49 -0700344 return 0;
345 }
346 p = match_strdup(&args[0]);
Jim Meyering3fbe5c32008-04-29 00:59:07 -0700347 if (p)
348 hsb->nls_io = load_nls(p);
Roman Zippel328b9222005-09-06 15:18:49 -0700349 if (!hsb->nls_io) {
Joe Perchesd6142672013-04-30 15:27:55 -0700350 pr_err("unable to load iocharset \"%s\"\n", p);
Roman Zippel328b9222005-09-06 15:18:49 -0700351 kfree(p);
352 return 0;
353 }
354 kfree(p);
355 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 default:
357 return 0;
358 }
359 }
360
Roman Zippel328b9222005-09-06 15:18:49 -0700361 if (hsb->nls_disk && !hsb->nls_io) {
362 hsb->nls_io = load_nls_default();
363 if (!hsb->nls_io) {
Joe Perchesd6142672013-04-30 15:27:55 -0700364 pr_err("unable to load default iocharset\n");
Roman Zippel328b9222005-09-06 15:18:49 -0700365 return 0;
366 }
367 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 hsb->s_dir_umask &= 0777;
369 hsb->s_file_umask &= 0577;
370
371 return 1;
372}
373
374/*
375 * hfs_read_super()
376 *
377 * This is the function that is responsible for mounting an HFS
378 * filesystem. It performs all the tasks necessary to get enough data
379 * from the disk to read the root inode. This includes parsing the
380 * mount options, dealing with Macintosh partitions, reading the
381 * superblock and the allocation bitmap blocks, calling
382 * hfs_btree_init() to get the necessary data about the extents and
383 * catalog B-trees and, finally, reading the root inode into memory.
384 */
385static int hfs_fill_super(struct super_block *sb, void *data, int silent)
386{
387 struct hfs_sb_info *sbi;
388 struct hfs_find_data fd;
389 hfs_cat_rec rec;
390 struct inode *root_inode;
391 int res;
392
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700393 sbi = kzalloc(sizeof(struct hfs_sb_info), GFP_KERNEL);
Jan Blunck8526fb32010-02-24 13:25:30 +0100394 if (!sbi)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 return -ENOMEM;
Jan Blunck8526fb32010-02-24 13:25:30 +0100396
Artem Bityutskiyb16ca622012-07-12 17:28:48 +0300397 sbi->sb = sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 sb->s_fs_info = sbi;
Artem Bityutskiy5687b572012-07-12 17:28:49 +0300399 spin_lock_init(&sbi->work_lock);
400 INIT_DELAYED_WORK(&sbi->mdb_work, flush_mdb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401
402 res = -EINVAL;
403 if (!parse_options((char *)data, sbi)) {
Joe Perchesd6142672013-04-30 15:27:55 -0700404 pr_err("unable to parse mount options\n");
Colin Leroy945b0922005-05-01 08:59:16 -0700405 goto bail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 }
407
408 sb->s_op = &hfs_super_operations;
409 sb->s_flags |= MS_NODIRATIME;
Matthias Kaehlcke3084b722008-07-25 01:46:34 -0700410 mutex_init(&sbi->bitmap_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411
412 res = hfs_mdb_get(sb);
413 if (res) {
414 if (!silent)
Joe Perchesd6142672013-04-30 15:27:55 -0700415 pr_warn("can't find a HFS filesystem on dev %s\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 hfs_mdb_name(sb));
417 res = -EINVAL;
Colin Leroy945b0922005-05-01 08:59:16 -0700418 goto bail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 }
420
421 /* try to get the root inode */
Alexey Khoroshilov9509f172013-04-30 15:27:52 -0700422 res = hfs_find_init(HFS_SB(sb)->cat_tree, &fd);
423 if (res)
424 goto bail_no_root;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 res = hfs_cat_find_brec(sb, HFS_ROOT_CNID, &fd);
Amerigo Wangec81aec2009-12-14 17:57:37 -0800426 if (!res) {
427 if (fd.entrylength > sizeof(rec) || fd.entrylength < 0) {
428 res = -EIO;
429 goto bail;
430 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, fd.entrylength);
Amerigo Wangec81aec2009-12-14 17:57:37 -0800432 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433 if (res) {
434 hfs_find_exit(&fd);
435 goto bail_no_root;
436 }
Eric Sandeend6ddf552006-11-16 01:19:22 -0800437 res = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 root_inode = hfs_iget(sb, &fd.search_key->cat, &rec);
439 hfs_find_exit(&fd);
440 if (!root_inode)
441 goto bail_no_root;
442
Al Viro518c79d2010-12-18 11:19:14 -0500443 sb->s_d_op = &hfs_dentry_operations;
Eric Sandeend6ddf552006-11-16 01:19:22 -0800444 res = -ENOMEM;
Al Viro48fde702012-01-08 22:15:13 -0500445 sb->s_root = d_make_root(root_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 if (!sb->s_root)
Al Viro48fde702012-01-08 22:15:13 -0500447 goto bail_no_root;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 /* everything's okay */
450 return 0;
451
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452bail_no_root:
Joe Perchesd6142672013-04-30 15:27:55 -0700453 pr_err("get root inode failed\n");
Colin Leroy945b0922005-05-01 08:59:16 -0700454bail:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 hfs_mdb_put(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 return res;
457}
458
Al Viro152a0832010-07-25 00:46:55 +0400459static struct dentry *hfs_mount(struct file_system_type *fs_type,
460 int flags, const char *dev_name, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461{
Al Viro152a0832010-07-25 00:46:55 +0400462 return mount_bdev(fs_type, flags, dev_name, data, hfs_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463}
464
465static struct file_system_type hfs_fs_type = {
466 .owner = THIS_MODULE,
467 .name = "hfs",
Al Viro152a0832010-07-25 00:46:55 +0400468 .mount = hfs_mount,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 .kill_sb = kill_block_super,
470 .fs_flags = FS_REQUIRES_DEV,
471};
Eric W. Biederman7f78e032013-03-02 19:39:14 -0800472MODULE_ALIAS_FS("hfs");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700474static void hfs_init_once(void *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475{
476 struct hfs_inode_info *i = p;
477
Christoph Lametera35afb82007-05-16 22:10:57 -0700478 inode_init_once(&i->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479}
480
481static int __init init_hfs_fs(void)
482{
483 int err;
484
485 hfs_inode_cachep = kmem_cache_create("hfs_inode_cache",
Vladimir Davydov5d097052016-01-14 15:18:21 -0800486 sizeof(struct hfs_inode_info), 0,
487 SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, hfs_init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488 if (!hfs_inode_cachep)
489 return -ENOMEM;
490 err = register_filesystem(&hfs_fs_type);
491 if (err)
492 kmem_cache_destroy(hfs_inode_cachep);
493 return err;
494}
495
496static void __exit exit_hfs_fs(void)
497{
498 unregister_filesystem(&hfs_fs_type);
Kirill A. Shutemov8c0a8532012-09-26 11:33:07 +1000499
500 /*
501 * Make sure all delayed rcu free inodes are flushed before we
502 * destroy cache.
503 */
504 rcu_barrier();
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -0700505 kmem_cache_destroy(hfs_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506}
507
508module_init(init_hfs_fs)
509module_exit(exit_hfs_fs)