[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / hfs / super.c

/*
 *  linux/fs/hfs/super.c
 *
 * Copyright (C) 1995-1997  Paul H. Hargrove
 * (C) 2003 Ardis Technologies <roman@ardistech.com>
 * This file may be distributed under the terms of the GNU General Public License.
 *
 * This file contains hfs_read_super(), some of the super_ops and
 * init_module() and cleanup_module().	The remaining super_ops are in
 * inode.c since they deal with inodes.
 *
 * Based on the minix file system code, (C) 1991, 1992 by Linus Torvalds
 */

#include <linux/config.h>
#include <linux/module.h>
#include <linux/blkdev.h>
#include <linux/init.h>
#include <linux/parser.h>
#include <linux/vfs.h>

#include "hfs_fs.h"
#include "btree.h"

static kmem_cache_t *hfs_inode_cachep;

MODULE_LICENSE("GPL");

/*
 * hfs_write_super()
 *
 * Description:
 *   This function is called by the VFS only. When the filesystem
 *   is mounted r/w it updates the MDB on disk.
 * Input Variable(s):
 *   struct super_block *sb: Pointer to the hfs superblock
 * Output Variable(s):
 *   NONE
 * Returns:
 *   void
 * Preconditions:
 *   'sb' points to a "valid" (struct super_block).
 * Postconditions:
 *   The MDB is marked 'unsuccessfully unmounted' by clearing bit 8 of drAtrb
 *   (hfs_put_super() must set this flag!). Some MDB fields are updated
 *   and the MDB buffer is written to disk by calling hfs_mdb_commit().
 */
static void hfs_write_super(struct super_block *sb)
{
	sb->s_dirt = 0;
	if (sb->s_flags & MS_RDONLY)
		return;
	/* sync everything to the buffers */
	hfs_mdb_commit(sb);
}

/*
 * hfs_put_super()
 *
 * This is the put_super() entry in the super_operations structure for
 * HFS filesystems.  The purpose is to release the resources
 * associated with the superblock sb.
 */
static void hfs_put_super(struct super_block *sb)
{
	hfs_mdb_close(sb);
	/* release the MDB's resources */
	hfs_mdb_put(sb);
}

/*
 * hfs_statfs()
 *
 * This is the statfs() entry in the super_operations structure for
 * HFS filesystems.  The purpose is to return various data about the
 * filesystem.
 *
 * changed f_files/f_ffree to reflect the fs_ablock/free_ablocks.
 */
static int hfs_statfs(struct super_block *sb, struct kstatfs *buf)
{
	buf->f_type = HFS_SUPER_MAGIC;
	buf->f_bsize = sb->s_blocksize;
	buf->f_blocks = (u32)HFS_SB(sb)->fs_ablocks * HFS_SB(sb)->fs_div;
	buf->f_bfree = (u32)HFS_SB(sb)->free_ablocks * HFS_SB(sb)->fs_div;
	buf->f_bavail = buf->f_bfree;
	buf->f_files = HFS_SB(sb)->fs_ablocks;
	buf->f_ffree = HFS_SB(sb)->free_ablocks;
	buf->f_namelen = HFS_NAMELEN;

	return 0;
}

static int hfs_remount(struct super_block *sb, int *flags, char *data)
{
	*flags |= MS_NODIRATIME;
	if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
		return 0;
	if (!(*flags & MS_RDONLY)) {
		if (!(HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_UNMNT))) {
			printk("HFS-fs warning: Filesystem was not cleanly unmounted, "
			       "running fsck.hfs is recommended.  leaving read-only.\n");
			sb->s_flags |= MS_RDONLY;
			*flags |= MS_RDONLY;
		} else if (HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_SLOCK)) {
			printk("HFS-fs: Filesystem is marked locked, leaving read-only.\n");
			sb->s_flags |= MS_RDONLY;
			*flags |= MS_RDONLY;
		}
	}
	return 0;
}

static struct inode *hfs_alloc_inode(struct super_block *sb)
{
	struct hfs_inode_info *i;

	i = kmem_cache_alloc(hfs_inode_cachep, SLAB_KERNEL);
	return i ? &i->vfs_inode : NULL;
}

static void hfs_destroy_inode(struct inode *inode)
{
	kmem_cache_free(hfs_inode_cachep, HFS_I(inode));
}

static struct super_operations hfs_super_operations = {
	.alloc_inode	= hfs_alloc_inode,
	.destroy_inode	= hfs_destroy_inode,
	.write_inode	= hfs_write_inode,
	.clear_inode	= hfs_clear_inode,
	.put_super	= hfs_put_super,
	.write_super	= hfs_write_super,
	.statfs		= hfs_statfs,
	.remount_fs     = hfs_remount,
};

enum {
	opt_uid, opt_gid, opt_umask, opt_file_umask, opt_dir_umask,
	opt_part, opt_session, opt_type, opt_creator, opt_quiet,
	opt_err
};

static match_table_t tokens = {
	{ opt_uid, "uid=%u" },
	{ opt_gid, "gid=%u" },
	{ opt_umask, "umask=%o" },
	{ opt_file_umask, "file_umask=%o" },
	{ opt_dir_umask, "dir_umask=%o" },
	{ opt_part, "part=%u" },
	{ opt_session, "session=%u" },
	{ opt_type, "type=%s" },
	{ opt_creator, "creator=%s" },
	{ opt_quiet, "quiet" },
	{ opt_err, NULL }
};

static inline int match_fourchar(substring_t *arg, u32 *result)
{
	if (arg->to - arg->from != 4)
		return -EINVAL;
	memcpy(result, arg->from, 4);
	return 0;
}

/*
 * parse_options()
 *
 * adapted from linux/fs/msdos/inode.c written 1992,93 by Werner Almesberger
 * This function is called by hfs_read_super() to parse the mount options.
 */
static int parse_options(char *options, struct hfs_sb_info *hsb)
{
	char *p;
	substring_t args[MAX_OPT_ARGS];
	int tmp, token;

	/* initialize the sb with defaults */
	hsb->s_uid = current->uid;
	hsb->s_gid = current->gid;
	hsb->s_file_umask = 0133;
	hsb->s_dir_umask = 0022;
	hsb->s_type = hsb->s_creator = cpu_to_be32(0x3f3f3f3f);	/* == '????' */
	hsb->s_quiet = 0;
	hsb->part = -1;
	hsb->session = -1;

	if (!options)
		return 1;

	while ((p = strsep(&options, ",")) != NULL) {
		if (!*p)
			continue;

		token = match_token(p, tokens, args);
		switch (token) {
		case opt_uid:
			if (match_int(&args[0], &tmp)) {
				printk("HFS: uid requires an argument\n");
				return 0;
			}
			hsb->s_uid = (uid_t)tmp;
			break;
		case opt_gid:
			if (match_int(&args[0], &tmp)) {
				printk("HFS: gid requires an argument\n");
				return 0;
			}
			hsb->s_gid = (gid_t)tmp;
			break;
		case opt_umask:
			if (match_octal(&args[0], &tmp)) {
				printk("HFS: umask requires a value\n");
				return 0;
			}
			hsb->s_file_umask = (umode_t)tmp;
			hsb->s_dir_umask = (umode_t)tmp;
			break;
		case opt_file_umask:
			if (match_octal(&args[0], &tmp)) {
				printk("HFS: file_umask requires a value\n");
				return 0;
			}
			hsb->s_file_umask = (umode_t)tmp;
			break;
		case opt_dir_umask:
			if (match_octal(&args[0], &tmp)) {
				printk("HFS: dir_umask requires a value\n");
				return 0;
			}
			hsb->s_dir_umask = (umode_t)tmp;
			break;
		case opt_part:
			if (match_int(&args[0], &hsb->part)) {
				printk("HFS: part requires an argument\n");
				return 0;
			}
			break;
		case opt_session:
			if (match_int(&args[0], &hsb->session)) {
				printk("HFS: session requires an argument\n");
				return 0;
			}
			break;
		case opt_type:
			if (match_fourchar(&args[0], &hsb->s_type)) {
				printk("HFS+-fs: type requires a 4 character value\n");
				return 0;
			}
			break;
		case opt_creator:
			if (match_fourchar(&args[0], &hsb->s_creator)) {
				printk("HFS+-fs: creator requires a 4 character value\n");
				return 0;
			}
			break;
		case opt_quiet:
			hsb->s_quiet = 1;
			break;
		default:
			return 0;
		}
	}

	hsb->s_dir_umask &= 0777;
	hsb->s_file_umask &= 0577;

	return 1;
}

/*
 * hfs_read_super()
 *
 * This is the function that is responsible for mounting an HFS
 * filesystem.	It performs all the tasks necessary to get enough data
 * from the disk to read the root inode.  This includes parsing the
 * mount options, dealing with Macintosh partitions, reading the
 * superblock and the allocation bitmap blocks, calling
 * hfs_btree_init() to get the necessary data about the extents and
 * catalog B-trees and, finally, reading the root inode into memory.
 */
static int hfs_fill_super(struct super_block *sb, void *data, int silent)
{
	struct hfs_sb_info *sbi;
	struct hfs_find_data fd;
	hfs_cat_rec rec;
	struct inode *root_inode;
	int res;

	sbi = kmalloc(sizeof(struct hfs_sb_info), GFP_KERNEL);
	if (!sbi)
		return -ENOMEM;
	sb->s_fs_info = sbi;
	memset(sbi, 0, sizeof(struct hfs_sb_info));
	INIT_HLIST_HEAD(&sbi->rsrc_inodes);

	res = -EINVAL;
	if (!parse_options((char *)data, sbi)) {
		hfs_warn("hfs_fs: unable to parse mount options.\n");
		goto bail3;
	}

	sb->s_op = &hfs_super_operations;
	sb->s_flags |= MS_NODIRATIME;
	init_MUTEX(&sbi->bitmap_lock);

	res = hfs_mdb_get(sb);
	if (res) {
		if (!silent)
			hfs_warn("VFS: Can't find a HFS filesystem on dev %s.\n",
				hfs_mdb_name(sb));
		res = -EINVAL;
		goto bail2;
	}

	/* try to get the root inode */
	hfs_find_init(HFS_SB(sb)->cat_tree, &fd);
	res = hfs_cat_find_brec(sb, HFS_ROOT_CNID, &fd);
	if (!res)
		hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, fd.entrylength);
	if (res) {
		hfs_find_exit(&fd);
		goto bail_no_root;
	}
	root_inode = hfs_iget(sb, &fd.search_key->cat, &rec);
	hfs_find_exit(&fd);
	if (!root_inode)
		goto bail_no_root;

	sb->s_root = d_alloc_root(root_inode);
	if (!sb->s_root)
		goto bail_iput;

	sb->s_root->d_op = &hfs_dentry_operations;

	/* everything's okay */
	return 0;

bail_iput:
	iput(root_inode);
bail_no_root:
	hfs_warn("hfs_fs: get root inode failed.\n");
	hfs_mdb_put(sb);
bail2:
bail3:
	kfree(sbi);
	return res;
}

static struct super_block *hfs_get_sb(struct file_system_type *fs_type,
				      int flags, const char *dev_name, void *data)
{
	return get_sb_bdev(fs_type, flags, dev_name, data, hfs_fill_super);
}

static struct file_system_type hfs_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "hfs",
	.get_sb		= hfs_get_sb,
	.kill_sb	= kill_block_super,
	.fs_flags	= FS_REQUIRES_DEV,
};

static void hfs_init_once(void *p, kmem_cache_t *cachep, unsigned long flags)
{
	struct hfs_inode_info *i = p;

	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == SLAB_CTOR_CONSTRUCTOR)
		inode_init_once(&i->vfs_inode);
}

static int __init init_hfs_fs(void)
{
	int err;

	hfs_inode_cachep = kmem_cache_create("hfs_inode_cache",
		sizeof(struct hfs_inode_info), 0, SLAB_HWCACHE_ALIGN,
		hfs_init_once, NULL);
	if (!hfs_inode_cachep)
		return -ENOMEM;
	err = register_filesystem(&hfs_fs_type);
	if (err)
		kmem_cache_destroy(hfs_inode_cachep);
	return err;
}

static void __exit exit_hfs_fs(void)
{
	unregister_filesystem(&hfs_fs_type);
	if (kmem_cache_destroy(hfs_inode_cachep))
		printk(KERN_INFO "hfs_inode_cache: not all structures were freed\n");
}

module_init(init_hfs_fs)
module_exit(exit_hfs_fs)
Commit	Line	Data
1da177e4 LT	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_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>
	18	#include <linux/init.h>
	19	#include <linux/parser.h>
	20	#include <linux/vfs.h>
	21
	22	#include "hfs_fs.h"
	23	#include "btree.h"
	24
	25	static kmem_cache_t *hfs_inode_cachep;
	26
	27	MODULE_LICENSE("GPL");
	28
	29	/*
	30	* hfs_write_super()
	31	*
	32	* Description:
	33	* This function is called by the VFS only. When the filesystem
	34	* is mounted r/w it updates the MDB on disk.
	35	* Input Variable(s):
	36	* struct super_block *sb: Pointer to the hfs superblock
	37	* Output Variable(s):
	38	* NONE
	39	* Returns:
	40	* void
	41	* Preconditions:
	42	* 'sb' points to a "valid" (struct super_block).
	43	* Postconditions:
	44	* The MDB is marked 'unsuccessfully unmounted' by clearing bit 8 of drAtrb
	45	* (hfs_put_super() must set this flag!). Some MDB fields are updated
	46	* and the MDB buffer is written to disk by calling hfs_mdb_commit().
	47	*/
	48	static void hfs_write_super(struct super_block *sb)
	49	{
	50	sb->s_dirt = 0;
	51	if (sb->s_flags & MS_RDONLY)
	52	return;
	53	/* sync everything to the buffers */
	54	hfs_mdb_commit(sb);
	55	}
	56
	57	/*
	58	* hfs_put_super()
	59	*
	60	* This is the put_super() entry in the super_operations structure for
	61	* HFS filesystems. The purpose is to release the resources
	62	* associated with the superblock sb.
	63	*/
	64	static void hfs_put_super(struct super_block *sb)
65	{
66	hfs_mdb_close(sb);
67	/* release the MDB's resources */
68	hfs_mdb_put(sb);
69	}
70
71	/*
72	* hfs_statfs()
73	*
74	* This is the statfs() entry in the super_operations structure for
75	* HFS filesystems. The purpose is to return various data about the
76	* filesystem.
77	*
78	* changed f_files/f_ffree to reflect the fs_ablock/free_ablocks.
79	*/
80	static int hfs_statfs(struct super_block sb, struct kstatfs buf)
81	{
82	buf->f_type = HFS_SUPER_MAGIC;
83	buf->f_bsize = sb->s_blocksize;
84	buf->f_blocks = (u32)HFS_SB(sb)->fs_ablocks * HFS_SB(sb)->fs_div;
85	buf->f_bfree = (u32)HFS_SB(sb)->free_ablocks * HFS_SB(sb)->fs_div;
86	buf->f_bavail = buf->f_bfree;
87	buf->f_files = HFS_SB(sb)->fs_ablocks;
88	buf->f_ffree = HFS_SB(sb)->free_ablocks;
89	buf->f_namelen = HFS_NAMELEN;
90
91	return 0;
92	}
93
94	static int hfs_remount(struct super_block sb, int flags, char *data)
95	{
96	*flags \|= MS_NODIRATIME;
97	if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
98	return 0;
99	if (!(*flags & MS_RDONLY)) {
100	if (!(HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_UNMNT))) {
101	printk("HFS-fs warning: Filesystem was not cleanly unmounted, "
102	"running fsck.hfs is recommended. leaving read-only.\n");
103	sb->s_flags \|= MS_RDONLY;
104	*flags \|= MS_RDONLY;
105	} else if (HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_SLOCK)) {
106	printk("HFS-fs: Filesystem is marked locked, leaving read-only.\n");
107	sb->s_flags \|= MS_RDONLY;
108	*flags \|= MS_RDONLY;
109	}
110	}
111	return 0;
112	}
113
114	static struct inode hfs_alloc_inode(struct super_block sb)
115	{
116	struct hfs_inode_info *i;
117
118	i = kmem_cache_alloc(hfs_inode_cachep, SLAB_KERNEL);
119	return i ? &i->vfs_inode : NULL;
120	}
121
122	static void hfs_destroy_inode(struct inode *inode)
123	{
124	kmem_cache_free(hfs_inode_cachep, HFS_I(inode));
125	}
126
127	static struct super_operations hfs_super_operations = {
128	.alloc_inode = hfs_alloc_inode,
129	.destroy_inode = hfs_destroy_inode,
130	.write_inode = hfs_write_inode,
131	.clear_inode = hfs_clear_inode,
132	.put_super = hfs_put_super,
133	.write_super = hfs_write_super,
134	.statfs = hfs_statfs,
135	.remount_fs = hfs_remount,
136	};
137
138	enum {
139	opt_uid, opt_gid, opt_umask, opt_file_umask, opt_dir_umask,
140	opt_part, opt_session, opt_type, opt_creator, opt_quiet,
141	opt_err
142	};
143
144	static match_table_t tokens = {
145	{ opt_uid, "uid=%u" },
146	{ opt_gid, "gid=%u" },
147	{ opt_umask, "umask=%o" },
148	{ opt_file_umask, "file_umask=%o" },
149	{ opt_dir_umask, "dir_umask=%o" },
150	{ opt_part, "part=%u" },
151	{ opt_session, "session=%u" },
152	{ opt_type, "type=%s" },
153	{ opt_creator, "creator=%s" },
154	{ opt_quiet, "quiet" },
155	{ opt_err, NULL }
156	};
157
158	static inline int match_fourchar(substring_t arg, u32 result)
159	{
160	if (arg->to - arg->from != 4)
161	return -EINVAL;
162	memcpy(result, arg->from, 4);
163	return 0;
164	}
165
166	/*
167	* parse_options()
168	*
169	* adapted from linux/fs/msdos/inode.c written 1992,93 by Werner Almesberger
170	* This function is called by hfs_read_super() to parse the mount options.
171	*/
172	static int parse_options(char options, struct hfs_sb_info hsb)
173	{
174	char *p;
175	substring_t args[MAX_OPT_ARGS];
176	int tmp, token;
177
178	/* initialize the sb with defaults */
179	hsb->s_uid = current->uid;
180	hsb->s_gid = current->gid;
181	hsb->s_file_umask = 0133;
182	hsb->s_dir_umask = 0022;
183	hsb->s_type = hsb->s_creator = cpu_to_be32(0x3f3f3f3f); /* == '????' */
184	hsb->s_quiet = 0;
185	hsb->part = -1;
186	hsb->session = -1;
187
188	if (!options)
189	return 1;
190
191	while ((p = strsep(&options, ",")) != NULL) {
192	if (!*p)
193	continue;
194
195	token = match_token(p, tokens, args);
196	switch (token) {
197	case opt_uid:
198	if (match_int(&args[0], &tmp)) {
199	printk("HFS: uid requires an argument\n");
200	return 0;
201	}
202	hsb->s_uid = (uid_t)tmp;
203	break;
204	case opt_gid:
205	if (match_int(&args[0], &tmp)) {
206	printk("HFS: gid requires an argument\n");
207	return 0;
208	}
209	hsb->s_gid = (gid_t)tmp;
210	break;
211	case opt_umask:
212	if (match_octal(&args[0], &tmp)) {
213	printk("HFS: umask requires a value\n");
214	return 0;
215	}
216	hsb->s_file_umask = (umode_t)tmp;
217	hsb->s_dir_umask = (umode_t)tmp;
218	break;
219	case opt_file_umask:
220	if (match_octal(&args[0], &tmp)) {
221	printk("HFS: file_umask requires a value\n");
222	return 0;
223	}
224	hsb->s_file_umask = (umode_t)tmp;
225	break;
226	case opt_dir_umask:
227	if (match_octal(&args[0], &tmp)) {
228	printk("HFS: dir_umask requires a value\n");
229	return 0;
230	}
231	hsb->s_dir_umask = (umode_t)tmp;
232	break;
233	case opt_part:
234	if (match_int(&args[0], &hsb->part)) {
235	printk("HFS: part requires an argument\n");
236	return 0;
237	}
238	break;
239	case opt_session:
240	if (match_int(&args[0], &hsb->session)) {
241	printk("HFS: session requires an argument\n");
242	return 0;
243	}
244	break;
245	case opt_type:
246	if (match_fourchar(&args[0], &hsb->s_type)) {
247	printk("HFS+-fs: type requires a 4 character value\n");
248	return 0;
249	}
250	break;
251	case opt_creator:
252	if (match_fourchar(&args[0], &hsb->s_creator)) {
253	printk("HFS+-fs: creator requires a 4 character value\n");
254	return 0;
255	}
256	break;
257	case opt_quiet:
258	hsb->s_quiet = 1;
259	break;
260	default:
261	return 0;
262	}
263	}
264
265	hsb->s_dir_umask &= 0777;
266	hsb->s_file_umask &= 0577;
267
268	return 1;
269	}
270
271	/*
272	* hfs_read_super()
273	*
274	* This is the function that is responsible for mounting an HFS
275	* filesystem. It performs all the tasks necessary to get enough data
276	* from the disk to read the root inode. This includes parsing the
277	* mount options, dealing with Macintosh partitions, reading the
278	* superblock and the allocation bitmap blocks, calling
279	* hfs_btree_init() to get the necessary data about the extents and
280	* catalog B-trees and, finally, reading the root inode into memory.
281	*/
282	static int hfs_fill_super(struct super_block sb, void data, int silent)
283	{
284	struct hfs_sb_info *sbi;
285	struct hfs_find_data fd;
286	hfs_cat_rec rec;
287	struct inode *root_inode;
288	int res;
289
290	sbi = kmalloc(sizeof(struct hfs_sb_info), GFP_KERNEL);
291	if (!sbi)
292	return -ENOMEM;
293	sb->s_fs_info = sbi;
294	memset(sbi, 0, sizeof(struct hfs_sb_info));
295	INIT_HLIST_HEAD(&sbi->rsrc_inodes);
296
297	res = -EINVAL;
298	if (!parse_options((char *)data, sbi)) {
299	hfs_warn("hfs_fs: unable to parse mount options.\n");
300	goto bail3;
301	}
302
303	sb->s_op = &hfs_super_operations;
304	sb->s_flags \|= MS_NODIRATIME;
305	init_MUTEX(&sbi->bitmap_lock);
306
307	res = hfs_mdb_get(sb);
308	if (res) {
309	if (!silent)
310	hfs_warn("VFS: Can't find a HFS filesystem on dev %s.\n",
311	hfs_mdb_name(sb));
312	res = -EINVAL;
313	goto bail2;
314	}
315
316	/* try to get the root inode */
317	hfs_find_init(HFS_SB(sb)->cat_tree, &fd);
318	res = hfs_cat_find_brec(sb, HFS_ROOT_CNID, &fd);
319	if (!res)
320	hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, fd.entrylength);
321	if (res) {
322	hfs_find_exit(&fd);
323	goto bail_no_root;
324	}
325	root_inode = hfs_iget(sb, &fd.search_key->cat, &rec);
326	hfs_find_exit(&fd);
327	if (!root_inode)
328	goto bail_no_root;
329
330	sb->s_root = d_alloc_root(root_inode);
331	if (!sb->s_root)
332	goto bail_iput;
333
334	sb->s_root->d_op = &hfs_dentry_operations;
335
336	/* everything's okay */
337	return 0;
338
339	bail_iput:
340	iput(root_inode);
341	bail_no_root:
342	hfs_warn("hfs_fs: get root inode failed.\n");
343	hfs_mdb_put(sb);
344	bail2:
345	bail3:
346	kfree(sbi);
347	return res;
348	}
349
350	static struct super_block hfs_get_sb(struct file_system_type fs_type,
351	int flags, const char dev_name, void data)
352	{
353	return get_sb_bdev(fs_type, flags, dev_name, data, hfs_fill_super);
354	}
355
356	static struct file_system_type hfs_fs_type = {
357	.owner = THIS_MODULE,
358	.name = "hfs",
359	.get_sb = hfs_get_sb,
360	.kill_sb = kill_block_super,
361	.fs_flags = FS_REQUIRES_DEV,
362	};
363
364	static void hfs_init_once(void p, kmem_cache_t cachep, unsigned long flags)
365	{
366	struct hfs_inode_info *i = p;
367
368	if ((flags & (SLAB_CTOR_VERIFY\|SLAB_CTOR_CONSTRUCTOR)) == SLAB_CTOR_CONSTRUCTOR)
369	inode_init_once(&i->vfs_inode);
370	}
371
372	static int __init init_hfs_fs(void)
373	{
374	int err;
375
376	hfs_inode_cachep = kmem_cache_create("hfs_inode_cache",
377	sizeof(struct hfs_inode_info), 0, SLAB_HWCACHE_ALIGN,
378	hfs_init_once, NULL);
379	if (!hfs_inode_cachep)
380	return -ENOMEM;
381	err = register_filesystem(&hfs_fs_type);
382	if (err)
383	kmem_cache_destroy(hfs_inode_cachep);
384	return err;
385	}
386
387	static void __exit exit_hfs_fs(void)
388	{
389	unregister_filesystem(&hfs_fs_type);
390	if (kmem_cache_destroy(hfs_inode_cachep))
391	printk(KERN_INFO "hfs_inode_cache: not all structures were freed\n");
392	}
393
394	module_init(init_hfs_fs)
395	module_exit(exit_hfs_fs)