[linux.git] / fs / hfs / super.c

/*
 *  linux/fs/hfs/super.c
 *
 * Copyright (C) 1995-1997  Paul H. Hargrove
 * (C) 2003 Ardis Technologies <[email protected]>
 * 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_hfs_fs() and exit_hfs_fs().  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/module.h>
#include <linux/blkdev.h>
#include <linux/mount.h>
#include <linux/init.h>
#include <linux/nls.h>
#include <linux/parser.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/vfs.h>

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

static struct kmem_cache *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)
{
	lock_super(sb);
	sb->s_dirt = 0;

	/* sync everything to the buffers */
	if (!(sb->s_flags & MS_RDONLY))
		hfs_mdb_commit(sb);
	unlock_super(sb);
}

static int hfs_sync_fs(struct super_block *sb, int wait)
{
	lock_super(sb);
	hfs_mdb_commit(sb);
	sb->s_dirt = 0;
	unlock_super(sb);

	return 0;
}

/*
 * 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)
{
	if (sb->s_dirt)
		hfs_write_super(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 dentry *dentry, struct kstatfs *buf)
{
	struct super_block *sb = dentry->d_sb;
	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);

	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_fsid.val[0] = (u32)id;
	buf->f_fsid.val[1] = (u32)(id >> 32);
	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(KERN_WARNING "hfs: 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(KERN_WARNING "hfs: filesystem is marked locked, leaving read-only.\n");
			sb->s_flags |= MS_RDONLY;
			*flags |= MS_RDONLY;
		}
	}
	return 0;
}

static int hfs_show_options(struct seq_file *seq, struct vfsmount *mnt)
{
	struct hfs_sb_info *sbi = HFS_SB(mnt->mnt_sb);

	if (sbi->s_creator != cpu_to_be32(0x3f3f3f3f))
		seq_printf(seq, ",creator=%.4s", (char *)&sbi->s_creator);
	if (sbi->s_type != cpu_to_be32(0x3f3f3f3f))
		seq_printf(seq, ",type=%.4s", (char *)&sbi->s_type);
	seq_printf(seq, ",uid=%u,gid=%u", sbi->s_uid, sbi->s_gid);
	if (sbi->s_file_umask != 0133)
		seq_printf(seq, ",file_umask=%o", sbi->s_file_umask);
	if (sbi->s_dir_umask != 0022)
		seq_printf(seq, ",dir_umask=%o", sbi->s_dir_umask);
	if (sbi->part >= 0)
		seq_printf(seq, ",part=%u", sbi->part);
	if (sbi->session >= 0)
		seq_printf(seq, ",session=%u", sbi->session);
	if (sbi->nls_disk)
		seq_printf(seq, ",codepage=%s", sbi->nls_disk->charset);
	if (sbi->nls_io)
		seq_printf(seq, ",iocharset=%s", sbi->nls_io->charset);
	if (sbi->s_quiet)
		seq_printf(seq, ",quiet");
	return 0;
}

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

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

static void hfs_i_callback(struct rcu_head *head)
{
	struct inode *inode = container_of(head, struct inode, i_rcu);
	INIT_LIST_HEAD(&inode->i_dentry);
	kmem_cache_free(hfs_inode_cachep, HFS_I(inode));
}

static void hfs_destroy_inode(struct inode *inode)
{
	call_rcu(&inode->i_rcu, hfs_i_callback);
}

static const struct super_operations hfs_super_operations = {
	.alloc_inode	= hfs_alloc_inode,
	.destroy_inode	= hfs_destroy_inode,
	.write_inode	= hfs_write_inode,
	.evict_inode	= hfs_evict_inode,
	.put_super	= hfs_put_super,
	.write_super	= hfs_write_super,
	.sync_fs	= hfs_sync_fs,
	.statfs		= hfs_statfs,
	.remount_fs     = hfs_remount,
	.show_options	= hfs_show_options,
};

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

static const 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_codepage, "codepage=%s" },
	{ opt_iocharset, "iocharset=%s" },
	{ 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(KERN_ERR "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(KERN_ERR "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(KERN_ERR "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(KERN_ERR "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(KERN_ERR "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(KERN_ERR "hfs: part requires an argument\n");
				return 0;
			}
			break;
		case opt_session:
			if (match_int(&args[0], &hsb->session)) {
				printk(KERN_ERR "hfs: session requires an argument\n");
				return 0;
			}
			break;
		case opt_type:
			if (match_fourchar(&args[0], &hsb->s_type)) {
				printk(KERN_ERR "hfs: type requires a 4 character value\n");
				return 0;
			}
			break;
		case opt_creator:
			if (match_fourchar(&args[0], &hsb->s_creator)) {
				printk(KERN_ERR "hfs: creator requires a 4 character value\n");
				return 0;
			}
			break;
		case opt_quiet:
			hsb->s_quiet = 1;
			break;
		case opt_codepage:
			if (hsb->nls_disk) {
				printk(KERN_ERR "hfs: unable to change codepage\n");
				return 0;
			}
			p = match_strdup(&args[0]);
			if (p)
				hsb->nls_disk = load_nls(p);
			if (!hsb->nls_disk) {
				printk(KERN_ERR "hfs: unable to load codepage \"%s\"\n", p);
				kfree(p);
				return 0;
			}
			kfree(p);
			break;
		case opt_iocharset:
			if (hsb->nls_io) {
				printk(KERN_ERR "hfs: unable to change iocharset\n");
				return 0;
			}
			p = match_strdup(&args[0]);
			if (p)
				hsb->nls_io = load_nls(p);
			if (!hsb->nls_io) {
				printk(KERN_ERR "hfs: unable to load iocharset \"%s\"\n", p);
				kfree(p);
				return 0;
			}
			kfree(p);
			break;
		default:
			return 0;
		}
	}

	if (hsb->nls_disk && !hsb->nls_io) {
		hsb->nls_io = load_nls_default();
		if (!hsb->nls_io) {
			printk(KERN_ERR "hfs: unable to load default iocharset\n");
			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 = kzalloc(sizeof(struct hfs_sb_info), GFP_KERNEL);
	if (!sbi)
		return -ENOMEM;

	sb->s_fs_info = sbi;

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

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

	res = hfs_mdb_get(sb);
	if (res) {
		if (!silent)
			printk(KERN_WARNING "hfs: can't find a HFS filesystem on dev %s.\n",
				hfs_mdb_name(sb));
		res = -EINVAL;
		goto bail;
	}

	/* 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) {
		if (fd.entrylength > sizeof(rec) || fd.entrylength < 0) {
			res =  -EIO;
			goto bail;
		}
		hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, fd.entrylength);
	}
	if (res) {
		hfs_find_exit(&fd);
		goto bail_no_root;
	}
	res = -EINVAL;
	root_inode = hfs_iget(sb, &fd.search_key->cat, &rec);
	hfs_find_exit(&fd);
	if (!root_inode)
		goto bail_no_root;

	sb->s_d_op = &hfs_dentry_operations;
	res = -ENOMEM;
	sb->s_root = d_alloc_root(root_inode);
	if (!sb->s_root)
		goto bail_iput;

	/* everything's okay */
	return 0;

bail_iput:
	iput(root_inode);
bail_no_root:
	printk(KERN_ERR "hfs: get root inode failed.\n");
bail:
	hfs_mdb_put(sb);
	return res;
}

static struct dentry *hfs_mount(struct file_system_type *fs_type,
		      int flags, const char *dev_name, void *data)
{
	return mount_bdev(fs_type, flags, dev_name, data, hfs_fill_super);
}

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

static void hfs_init_once(void *p)
{
	struct hfs_inode_info *i = p;

	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);
	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);
	kmem_cache_destroy(hfs_inode_cachep);
}

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 <[email protected]>
	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
14b30d62	9	* init_hfs_fs() and exit_hfs_fs(). The remaining super_ops are in
1da177e4 LT	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
1da177e4 LT	15	#include <linux/module.h>
1da177e4 LT	16	#include <linux/blkdev.h>
717dd80e	17	#include <linux/mount.h>
1da177e4	18	#include <linux/init.h>
328b9227	19	#include <linux/nls.h>
1da177e4	20	#include <linux/parser.h>
717dd80e	21	#include <linux/seq_file.h>
5a0e3ad6	22	#include <linux/slab.h>
1da177e4 LT	23	#include <linux/vfs.h>
	24
	25	#include "hfs_fs.h"
	26	#include "btree.h"
	27
e18b890b	28	static struct kmem_cache *hfs_inode_cachep;
1da177e4 LT	29
	30	MODULE_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	*/
	51	static void hfs_write_super(struct super_block *sb)
	52	{
ebc1ac16	53	lock_super(sb);
1da177e4	54	sb->s_dirt = 0;
ebc1ac16	55
1da177e4	56	/* sync everything to the buffers */
ebc1ac16 CH	57	if (!(sb->s_flags & MS_RDONLY))
	58	hfs_mdb_commit(sb);
	59	unlock_super(sb);
1da177e4 LT	60	}
1da177e4 LT	61
58bc5bbb CH	62	static int hfs_sync_fs(struct super_block *sb, int wait)
	63	{
	64	lock_super(sb);
	65	hfs_mdb_commit(sb);
	66	sb->s_dirt = 0;
	67	unlock_super(sb);
	68
	69	return 0;
	70	}
	71
1da177e4 LT	72	/*
	73	* hfs_put_super()
	74	*
	75	* This is the put_super() entry in the super_operations structure for
	76	* HFS filesystems. The purpose is to release the resources
	77	* associated with the superblock sb.
	78	*/
	79	static void hfs_put_super(struct super_block *sb)
	80	{
8c85e125 CH	81	if (sb->s_dirt)
8c85e125 CH	82	hfs_write_super(sb);
1da177e4 LT	83	hfs_mdb_close(sb);
	84	/* release the MDB's resources */
	85	hfs_mdb_put(sb);
	86	}
	87
	88	/*
	89	* hfs_statfs()
	90	*
	91	* This is the statfs() entry in the super_operations structure for
	92	* HFS filesystems. The purpose is to return various data about the
	93	* filesystem.
	94	*
	95	* changed f_files/f_ffree to reflect the fs_ablock/free_ablocks.
	96	*/
726c3342	97	static int hfs_statfs(struct dentry dentry, struct kstatfs buf)
1da177e4	98	{
726c3342	99	struct super_block *sb = dentry->d_sb;
7dd2c000	100	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
726c3342	101
1da177e4 LT	102	buf->f_type = HFS_SUPER_MAGIC;
	103	buf->f_bsize = sb->s_blocksize;
	104	buf->f_blocks = (u32)HFS_SB(sb)->fs_ablocks * HFS_SB(sb)->fs_div;
	105	buf->f_bfree = (u32)HFS_SB(sb)->free_ablocks * HFS_SB(sb)->fs_div;
	106	buf->f_bavail = buf->f_bfree;
	107	buf->f_files = HFS_SB(sb)->fs_ablocks;
	108	buf->f_ffree = HFS_SB(sb)->free_ablocks;
7dd2c000 CL	109	buf->f_fsid.val[0] = (u32)id;
7dd2c000 CL	110	buf->f_fsid.val[1] = (u32)(id >> 32);
1da177e4 LT	111	buf->f_namelen = HFS_NAMELEN;
	112
	113	return 0;
	114	}
	115
	116	static int hfs_remount(struct super_block sb, int flags, char *data)
	117	{
	118	*flags \|= MS_NODIRATIME;
	119	if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
	120	return 0;
	121	if (!(*flags & MS_RDONLY)) {
	122	if (!(HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_UNMNT))) {
7cf3cc30	123	printk(KERN_WARNING "hfs: filesystem was not cleanly unmounted, "
1da177e4 LT	124	"running fsck.hfs is recommended. leaving read-only.\n");
	125	sb->s_flags \|= MS_RDONLY;
	126	*flags \|= MS_RDONLY;
	127	} else if (HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_SLOCK)) {
7cf3cc30	128	printk(KERN_WARNING "hfs: filesystem is marked locked, leaving read-only.\n");
1da177e4 LT	129	sb->s_flags \|= MS_RDONLY;
	130	*flags \|= MS_RDONLY;
	131	}
	132	}
	133	return 0;
	134	}
	135
717dd80e RZ	136	static int hfs_show_options(struct seq_file seq, struct vfsmount mnt)
	137	{
	138	struct hfs_sb_info *sbi = HFS_SB(mnt->mnt_sb);
	139
	140	if (sbi->s_creator != cpu_to_be32(0x3f3f3f3f))
	141	seq_printf(seq, ",creator=%.4s", (char *)&sbi->s_creator);
	142	if (sbi->s_type != cpu_to_be32(0x3f3f3f3f))
	143	seq_printf(seq, ",type=%.4s", (char *)&sbi->s_type);
	144	seq_printf(seq, ",uid=%u,gid=%u", sbi->s_uid, sbi->s_gid);
	145	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);
328b9227 RZ	153	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);
717dd80e RZ	157	if (sbi->s_quiet)
	158	seq_printf(seq, ",quiet");
	159	return 0;
	160	}
	161
1da177e4 LT	162	static struct inode hfs_alloc_inode(struct super_block sb)
	163	{
	164	struct hfs_inode_info *i;
	165
e94b1766	166	i = kmem_cache_alloc(hfs_inode_cachep, GFP_KERNEL);
1da177e4 LT	167	return i ? &i->vfs_inode : NULL;
	168	}
	169
fa0d7e3d	170	static void hfs_i_callback(struct rcu_head *head)
1da177e4	171	{
fa0d7e3d NP	172	struct inode *inode = container_of(head, struct inode, i_rcu);
fa0d7e3d NP	173	INIT_LIST_HEAD(&inode->i_dentry);
1da177e4 LT	174	kmem_cache_free(hfs_inode_cachep, HFS_I(inode));
	175	}
	176
fa0d7e3d NP	177	static void hfs_destroy_inode(struct inode *inode)
	178	{
	179	call_rcu(&inode->i_rcu, hfs_i_callback);
	180	}
	181
ee9b6d61	182	static const struct super_operations hfs_super_operations = {
1da177e4 LT	183	.alloc_inode = hfs_alloc_inode,
	184	.destroy_inode = hfs_destroy_inode,
	185	.write_inode = hfs_write_inode,
b57922d9	186	.evict_inode = hfs_evict_inode,
1da177e4 LT	187	.put_super = hfs_put_super,
1da177e4 LT	188	.write_super = hfs_write_super,
58bc5bbb	189	.sync_fs = hfs_sync_fs,
1da177e4 LT	190	.statfs = hfs_statfs,
1da177e4 LT	191	.remount_fs = hfs_remount,
717dd80e	192	.show_options = hfs_show_options,
1da177e4 LT	193	};
	194
	195	enum {
	196	opt_uid, opt_gid, opt_umask, opt_file_umask, opt_dir_umask,
	197	opt_part, opt_session, opt_type, opt_creator, opt_quiet,
328b9227	198	opt_codepage, opt_iocharset,
1da177e4 LT	199	opt_err
	200	};
	201
a447c093	202	static const match_table_t tokens = {
1da177e4 LT	203	{ opt_uid, "uid=%u" },
	204	{ opt_gid, "gid=%u" },
	205	{ opt_umask, "umask=%o" },
	206	{ opt_file_umask, "file_umask=%o" },
	207	{ opt_dir_umask, "dir_umask=%o" },
	208	{ opt_part, "part=%u" },
	209	{ opt_session, "session=%u" },
	210	{ opt_type, "type=%s" },
	211	{ opt_creator, "creator=%s" },
	212	{ opt_quiet, "quiet" },
328b9227 RZ	213	{ opt_codepage, "codepage=%s" },
328b9227 RZ	214	{ opt_iocharset, "iocharset=%s" },
1da177e4 LT	215	{ opt_err, NULL }
	216	};
	217
	218	static inline int match_fourchar(substring_t arg, u32 result)
	219	{
	220	if (arg->to - arg->from != 4)
	221	return -EINVAL;
	222	memcpy(result, arg->from, 4);
	223	return 0;
	224	}
	225
	226	/*
	227	* parse_options()
	228	*
	229	* adapted from linux/fs/msdos/inode.c written 1992,93 by Werner Almesberger
	230	* This function is called by hfs_read_super() to parse the mount options.
	231	*/
	232	static int parse_options(char options, struct hfs_sb_info hsb)
	233	{
	234	char *p;
	235	substring_t args[MAX_OPT_ARGS];
	236	int tmp, token;
	237
	238	/* initialize the sb with defaults */
94c9a5ee DH	239	hsb->s_uid = current_uid();
94c9a5ee DH	240	hsb->s_gid = current_gid();
1da177e4 LT	241	hsb->s_file_umask = 0133;
	242	hsb->s_dir_umask = 0022;
	243	hsb->s_type = hsb->s_creator = cpu_to_be32(0x3f3f3f3f); /* == '????' */
	244	hsb->s_quiet = 0;
	245	hsb->part = -1;
	246	hsb->session = -1;
	247
	248	if (!options)
	249	return 1;
	250
	251	while ((p = strsep(&options, ",")) != NULL) {
	252	if (!*p)
	253	continue;
	254
	255	token = match_token(p, tokens, args);
	256	switch (token) {
	257	case opt_uid:
	258	if (match_int(&args[0], &tmp)) {
7cf3cc30	259	printk(KERN_ERR "hfs: uid requires an argument\n");
1da177e4 LT	260	return 0;
	261	}
	262	hsb->s_uid = (uid_t)tmp;
	263	break;
	264	case opt_gid:
	265	if (match_int(&args[0], &tmp)) {
7cf3cc30	266	printk(KERN_ERR "hfs: gid requires an argument\n");
1da177e4 LT	267	return 0;
	268	}
	269	hsb->s_gid = (gid_t)tmp;
	270	break;
	271	case opt_umask:
	272	if (match_octal(&args[0], &tmp)) {
7cf3cc30	273	printk(KERN_ERR "hfs: umask requires a value\n");
1da177e4 LT	274	return 0;
	275	}
	276	hsb->s_file_umask = (umode_t)tmp;
	277	hsb->s_dir_umask = (umode_t)tmp;
	278	break;
	279	case opt_file_umask:
	280	if (match_octal(&args[0], &tmp)) {
7cf3cc30	281	printk(KERN_ERR "hfs: file_umask requires a value\n");
1da177e4 LT	282	return 0;
	283	}
	284	hsb->s_file_umask = (umode_t)tmp;
	285	break;
	286	case opt_dir_umask:
	287	if (match_octal(&args[0], &tmp)) {
7cf3cc30	288	printk(KERN_ERR "hfs: dir_umask requires a value\n");
1da177e4 LT	289	return 0;
	290	}
	291	hsb->s_dir_umask = (umode_t)tmp;
	292	break;
	293	case opt_part:
	294	if (match_int(&args[0], &hsb->part)) {
7cf3cc30	295	printk(KERN_ERR "hfs: part requires an argument\n");
1da177e4 LT	296	return 0;
	297	}
	298	break;
	299	case opt_session:
	300	if (match_int(&args[0], &hsb->session)) {
7cf3cc30	301	printk(KERN_ERR "hfs: session requires an argument\n");
1da177e4 LT	302	return 0;
	303	}
	304	break;
	305	case opt_type:
	306	if (match_fourchar(&args[0], &hsb->s_type)) {
7cf3cc30	307	printk(KERN_ERR "hfs: type requires a 4 character value\n");
1da177e4 LT	308	return 0;
	309	}
	310	break;
	311	case opt_creator:
	312	if (match_fourchar(&args[0], &hsb->s_creator)) {
7cf3cc30	313	printk(KERN_ERR "hfs: creator requires a 4 character value\n");
1da177e4 LT	314	return 0;
	315	}
	316	break;
	317	case opt_quiet:
	318	hsb->s_quiet = 1;
	319	break;
328b9227 RZ	320	case opt_codepage:
328b9227 RZ	321	if (hsb->nls_disk) {
7cf3cc30	322	printk(KERN_ERR "hfs: unable to change codepage\n");
328b9227 RZ	323	return 0;
	324	}
	325	p = match_strdup(&args[0]);
3fbe5c31 JM	326	if (p)
3fbe5c31 JM	327	hsb->nls_disk = load_nls(p);
328b9227	328	if (!hsb->nls_disk) {
7cf3cc30	329	printk(KERN_ERR "hfs: unable to load codepage \"%s\"\n", p);
328b9227 RZ	330	kfree(p);
	331	return 0;
	332	}
	333	kfree(p);
	334	break;
	335	case opt_iocharset:
	336	if (hsb->nls_io) {
7cf3cc30	337	printk(KERN_ERR "hfs: unable to change iocharset\n");
328b9227 RZ	338	return 0;
	339	}
	340	p = match_strdup(&args[0]);
3fbe5c31 JM	341	if (p)
3fbe5c31 JM	342	hsb->nls_io = load_nls(p);
328b9227	343	if (!hsb->nls_io) {
7cf3cc30	344	printk(KERN_ERR "hfs: unable to load iocharset \"%s\"\n", p);
328b9227 RZ	345	kfree(p);
	346	return 0;
	347	}
	348	kfree(p);
	349	break;
1da177e4 LT	350	default:
	351	return 0;
	352	}
	353	}
	354
328b9227 RZ	355	if (hsb->nls_disk && !hsb->nls_io) {
	356	hsb->nls_io = load_nls_default();
	357	if (!hsb->nls_io) {
7cf3cc30	358	printk(KERN_ERR "hfs: unable to load default iocharset\n");
328b9227 RZ	359	return 0;
	360	}
	361	}
1da177e4 LT	362	hsb->s_dir_umask &= 0777;
	363	hsb->s_file_umask &= 0577;
	364
	365	return 1;
	366	}
	367
	368	/*
	369	* hfs_read_super()
	370	*
	371	* This is the function that is responsible for mounting an HFS
	372	* filesystem. It performs all the tasks necessary to get enough data
	373	* from the disk to read the root inode. This includes parsing the
	374	* mount options, dealing with Macintosh partitions, reading the
	375	* superblock and the allocation bitmap blocks, calling
	376	* hfs_btree_init() to get the necessary data about the extents and
	377	* catalog B-trees and, finally, reading the root inode into memory.
	378	*/
	379	static int hfs_fill_super(struct super_block sb, void data, int silent)
	380	{
	381	struct hfs_sb_info *sbi;
	382	struct hfs_find_data fd;
	383	hfs_cat_rec rec;
	384	struct inode *root_inode;
	385	int res;
	386
f8314dc6	387	sbi = kzalloc(sizeof(struct hfs_sb_info), GFP_KERNEL);
8526fb37	388	if (!sbi)
1da177e4	389	return -ENOMEM;
8526fb37	390
1da177e4	391	sb->s_fs_info = sbi;
1da177e4 LT	392
	393	res = -EINVAL;
	394	if (!parse_options((char *)data, sbi)) {
7cf3cc30	395	printk(KERN_ERR "hfs: unable to parse mount options.\n");
945b0920	396	goto bail;
1da177e4 LT	397	}
	398
	399	sb->s_op = &hfs_super_operations;
	400	sb->s_flags \|= MS_NODIRATIME;
3084b72d	401	mutex_init(&sbi->bitmap_lock);
1da177e4 LT	402
	403	res = hfs_mdb_get(sb);
	404	if (res) {
	405	if (!silent)
7cf3cc30	406	printk(KERN_WARNING "hfs: can't find a HFS filesystem on dev %s.\n",
1da177e4 LT	407	hfs_mdb_name(sb));
1da177e4 LT	408	res = -EINVAL;
945b0920	409	goto bail;
1da177e4 LT	410	}
	411
	412	/* try to get the root inode */
	413	hfs_find_init(HFS_SB(sb)->cat_tree, &fd);
	414	res = hfs_cat_find_brec(sb, HFS_ROOT_CNID, &fd);
ec81aecb AW	415	if (!res) {
	416	if (fd.entrylength > sizeof(rec) \|\| fd.entrylength < 0) {
	417	res = -EIO;
	418	goto bail;
	419	}
1da177e4	420	hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, fd.entrylength);
ec81aecb	421	}
1da177e4 LT	422	if (res) {
	423	hfs_find_exit(&fd);
	424	goto bail_no_root;
	425	}
d6ddf554	426	res = -EINVAL;
1da177e4 LT	427	root_inode = hfs_iget(sb, &fd.search_key->cat, &rec);
	428	hfs_find_exit(&fd);
	429	if (!root_inode)
	430	goto bail_no_root;
	431
518c79d2	432	sb->s_d_op = &hfs_dentry_operations;
d6ddf554	433	res = -ENOMEM;
1da177e4 LT	434	sb->s_root = d_alloc_root(root_inode);
	435	if (!sb->s_root)
	436	goto bail_iput;
	437
1da177e4 LT	438	/* everything's okay */
	439	return 0;
	440
	441	bail_iput:
	442	iput(root_inode);
	443	bail_no_root:
7cf3cc30	444	printk(KERN_ERR "hfs: get root inode failed.\n");
945b0920	445	bail:
1da177e4	446	hfs_mdb_put(sb);
1da177e4 LT	447	return res;
	448	}
	449
152a0836 AV	450	static struct dentry hfs_mount(struct file_system_type fs_type,
152a0836 AV	451	int flags, const char dev_name, void data)
1da177e4	452	{
152a0836	453	return mount_bdev(fs_type, flags, dev_name, data, hfs_fill_super);
1da177e4 LT	454	}
	455
	456	static struct file_system_type hfs_fs_type = {
	457	.owner = THIS_MODULE,
	458	.name = "hfs",
152a0836	459	.mount = hfs_mount,
1da177e4 LT	460	.kill_sb = kill_block_super,
	461	.fs_flags = FS_REQUIRES_DEV,
	462	};
	463
51cc5068	464	static void hfs_init_once(void *p)
1da177e4 LT	465	{
	466	struct hfs_inode_info *i = p;
	467
a35afb83	468	inode_init_once(&i->vfs_inode);
1da177e4 LT	469	}
	470
	471	static int __init init_hfs_fs(void)
	472	{
	473	int err;
	474
	475	hfs_inode_cachep = kmem_cache_create("hfs_inode_cache",
	476	sizeof(struct hfs_inode_info), 0, SLAB_HWCACHE_ALIGN,
20c2df83	477	hfs_init_once);
1da177e4 LT	478	if (!hfs_inode_cachep)
	479	return -ENOMEM;
	480	err = register_filesystem(&hfs_fs_type);
	481	if (err)
	482	kmem_cache_destroy(hfs_inode_cachep);
	483	return err;
	484	}
	485
	486	static void __exit exit_hfs_fs(void)
	487	{
	488	unregister_filesystem(&hfs_fs_type);
1a1d92c1	489	kmem_cache_destroy(hfs_inode_cachep);
1da177e4 LT	490	}
	491
	492	module_init(init_hfs_fs)
	493	module_exit(exit_hfs_fs)