[net-next-2.6.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_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/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)
{
	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)
{
	lock_kernel();

	if (sb->s_dirt)
		hfs_write_super(sb);
	hfs_mdb_close(sb);
	/* release the MDB's resources */
	hfs_mdb_put(sb);

	unlock_kernel();
}

/*
 * 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_destroy_inode(struct inode *inode)
{
	kmem_cache_free(hfs_inode_cachep, HFS_I(inode));
}

static const 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,
	.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;
	INIT_HLIST_HEAD(&sbi->rsrc_inodes);

	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)
		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;

	res = -ENOMEM;
	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:
	printk(KERN_ERR "hfs: get root inode failed.\n");
bail:
	hfs_mdb_put(sb);
	return res;
}

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

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)
{
	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 <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
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>
1da177e4 LT	22	#include <linux/vfs.h>
	23
	24	#include "hfs_fs.h"
	25	#include "btree.h"
	26
e18b890b	27	static struct kmem_cache *hfs_inode_cachep;
1da177e4 LT	28
	29	MODULE_LICENSE("GPL");
	30
	31	/*
	32	* hfs_write_super()
	33	*
	34	* Description:
	35	* This function is called by the VFS only. When the filesystem
	36	* is mounted r/w it updates the MDB on disk.
	37	* Input Variable(s):
	38	* struct super_block *sb: Pointer to the hfs superblock
	39	* Output Variable(s):
	40	* NONE
	41	* Returns:
	42	* void
	43	* Preconditions:
	44	* 'sb' points to a "valid" (struct super_block).
	45	* Postconditions:
	46	* The MDB is marked 'unsuccessfully unmounted' by clearing bit 8 of drAtrb
	47	* (hfs_put_super() must set this flag!). Some MDB fields are updated
	48	* and the MDB buffer is written to disk by calling hfs_mdb_commit().
	49	*/
	50	static void hfs_write_super(struct super_block *sb)
	51	{
	52	sb->s_dirt = 0;
	53	if (sb->s_flags & MS_RDONLY)
	54	return;
	55	/* sync everything to the buffers */
	56	hfs_mdb_commit(sb);
	57	}
	58
	59	/*
	60	* hfs_put_super()
	61	*
	62	* This is the put_super() entry in the super_operations structure for
	63	* HFS filesystems. The purpose is to release the resources
	64	* associated with the superblock sb.
	65	*/
	66	static void hfs_put_super(struct super_block *sb)
	67	{
6cfd0148 CH	68	lock_kernel();
6cfd0148 CH	69
8c85e125 CH	70	if (sb->s_dirt)
8c85e125 CH	71	hfs_write_super(sb);
1da177e4 LT	72	hfs_mdb_close(sb);
	73	/* release the MDB's resources */
	74	hfs_mdb_put(sb);
6cfd0148 CH	75
6cfd0148 CH	76	unlock_kernel();
1da177e4 LT	77	}
	78
	79	/*
	80	* hfs_statfs()
	81	*
	82	* This is the statfs() entry in the super_operations structure for
	83	* HFS filesystems. The purpose is to return various data about the
	84	* filesystem.
	85	*
	86	* changed f_files/f_ffree to reflect the fs_ablock/free_ablocks.
	87	*/
726c3342	88	static int hfs_statfs(struct dentry dentry, struct kstatfs buf)
1da177e4	89	{
726c3342	90	struct super_block *sb = dentry->d_sb;
7dd2c000	91	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
726c3342	92
1da177e4 LT	93	buf->f_type = HFS_SUPER_MAGIC;
	94	buf->f_bsize = sb->s_blocksize;
	95	buf->f_blocks = (u32)HFS_SB(sb)->fs_ablocks * HFS_SB(sb)->fs_div;
	96	buf->f_bfree = (u32)HFS_SB(sb)->free_ablocks * HFS_SB(sb)->fs_div;
	97	buf->f_bavail = buf->f_bfree;
	98	buf->f_files = HFS_SB(sb)->fs_ablocks;
	99	buf->f_ffree = HFS_SB(sb)->free_ablocks;
7dd2c000 CL	100	buf->f_fsid.val[0] = (u32)id;
7dd2c000 CL	101	buf->f_fsid.val[1] = (u32)(id >> 32);
1da177e4 LT	102	buf->f_namelen = HFS_NAMELEN;
	103
	104	return 0;
	105	}
	106
	107	static int hfs_remount(struct super_block sb, int flags, char *data)
	108	{
	109	*flags \|= MS_NODIRATIME;
	110	if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
	111	return 0;
	112	if (!(*flags & MS_RDONLY)) {
	113	if (!(HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_UNMNT))) {
7cf3cc30	114	printk(KERN_WARNING "hfs: filesystem was not cleanly unmounted, "
1da177e4 LT	115	"running fsck.hfs is recommended. leaving read-only.\n");
	116	sb->s_flags \|= MS_RDONLY;
	117	*flags \|= MS_RDONLY;
	118	} else if (HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_SLOCK)) {
7cf3cc30	119	printk(KERN_WARNING "hfs: filesystem is marked locked, leaving read-only.\n");
1da177e4 LT	120	sb->s_flags \|= MS_RDONLY;
	121	*flags \|= MS_RDONLY;
	122	}
	123	}
	124	return 0;
	125	}
	126
717dd80e RZ	127	static int hfs_show_options(struct seq_file seq, struct vfsmount mnt)
	128	{
	129	struct hfs_sb_info *sbi = HFS_SB(mnt->mnt_sb);
	130
	131	if (sbi->s_creator != cpu_to_be32(0x3f3f3f3f))
	132	seq_printf(seq, ",creator=%.4s", (char *)&sbi->s_creator);
	133	if (sbi->s_type != cpu_to_be32(0x3f3f3f3f))
	134	seq_printf(seq, ",type=%.4s", (char *)&sbi->s_type);
	135	seq_printf(seq, ",uid=%u,gid=%u", sbi->s_uid, sbi->s_gid);
	136	if (sbi->s_file_umask != 0133)
	137	seq_printf(seq, ",file_umask=%o", sbi->s_file_umask);
	138	if (sbi->s_dir_umask != 0022)
	139	seq_printf(seq, ",dir_umask=%o", sbi->s_dir_umask);
	140	if (sbi->part >= 0)
	141	seq_printf(seq, ",part=%u", sbi->part);
	142	if (sbi->session >= 0)
	143	seq_printf(seq, ",session=%u", sbi->session);
328b9227 RZ	144	if (sbi->nls_disk)
	145	seq_printf(seq, ",codepage=%s", sbi->nls_disk->charset);
	146	if (sbi->nls_io)
	147	seq_printf(seq, ",iocharset=%s", sbi->nls_io->charset);
717dd80e RZ	148	if (sbi->s_quiet)
	149	seq_printf(seq, ",quiet");
	150	return 0;
	151	}
	152
1da177e4 LT	153	static struct inode hfs_alloc_inode(struct super_block sb)
	154	{
	155	struct hfs_inode_info *i;
	156
e94b1766	157	i = kmem_cache_alloc(hfs_inode_cachep, GFP_KERNEL);
1da177e4 LT	158	return i ? &i->vfs_inode : NULL;
	159	}
	160
	161	static void hfs_destroy_inode(struct inode *inode)
	162	{
	163	kmem_cache_free(hfs_inode_cachep, HFS_I(inode));
	164	}
	165
ee9b6d61	166	static const struct super_operations hfs_super_operations = {
1da177e4 LT	167	.alloc_inode = hfs_alloc_inode,
	168	.destroy_inode = hfs_destroy_inode,
	169	.write_inode = hfs_write_inode,
	170	.clear_inode = hfs_clear_inode,
	171	.put_super = hfs_put_super,
	172	.write_super = hfs_write_super,
	173	.statfs = hfs_statfs,
	174	.remount_fs = hfs_remount,
717dd80e	175	.show_options = hfs_show_options,
1da177e4 LT	176	};
	177
	178	enum {
	179	opt_uid, opt_gid, opt_umask, opt_file_umask, opt_dir_umask,
	180	opt_part, opt_session, opt_type, opt_creator, opt_quiet,
328b9227	181	opt_codepage, opt_iocharset,
1da177e4 LT	182	opt_err
	183	};
	184
a447c093	185	static const match_table_t tokens = {
1da177e4 LT	186	{ opt_uid, "uid=%u" },
	187	{ opt_gid, "gid=%u" },
	188	{ opt_umask, "umask=%o" },
	189	{ opt_file_umask, "file_umask=%o" },
	190	{ opt_dir_umask, "dir_umask=%o" },
	191	{ opt_part, "part=%u" },
	192	{ opt_session, "session=%u" },
	193	{ opt_type, "type=%s" },
	194	{ opt_creator, "creator=%s" },
	195	{ opt_quiet, "quiet" },
328b9227 RZ	196	{ opt_codepage, "codepage=%s" },
328b9227 RZ	197	{ opt_iocharset, "iocharset=%s" },
1da177e4 LT	198	{ opt_err, NULL }
	199	};
	200
	201	static inline int match_fourchar(substring_t arg, u32 result)
	202	{
	203	if (arg->to - arg->from != 4)
	204	return -EINVAL;
	205	memcpy(result, arg->from, 4);
	206	return 0;
	207	}
	208
	209	/*
	210	* parse_options()
	211	*
	212	* adapted from linux/fs/msdos/inode.c written 1992,93 by Werner Almesberger
	213	* This function is called by hfs_read_super() to parse the mount options.
	214	*/
	215	static int parse_options(char options, struct hfs_sb_info hsb)
	216	{
	217	char *p;
	218	substring_t args[MAX_OPT_ARGS];
	219	int tmp, token;
	220
	221	/* initialize the sb with defaults */
94c9a5ee DH	222	hsb->s_uid = current_uid();
94c9a5ee DH	223	hsb->s_gid = current_gid();
1da177e4 LT	224	hsb->s_file_umask = 0133;
	225	hsb->s_dir_umask = 0022;
	226	hsb->s_type = hsb->s_creator = cpu_to_be32(0x3f3f3f3f); /* == '????' */
	227	hsb->s_quiet = 0;
	228	hsb->part = -1;
	229	hsb->session = -1;
	230
	231	if (!options)
	232	return 1;
	233
	234	while ((p = strsep(&options, ",")) != NULL) {
	235	if (!*p)
	236	continue;
	237
	238	token = match_token(p, tokens, args);
	239	switch (token) {
	240	case opt_uid:
	241	if (match_int(&args[0], &tmp)) {
7cf3cc30	242	printk(KERN_ERR "hfs: uid requires an argument\n");
1da177e4 LT	243	return 0;
	244	}
	245	hsb->s_uid = (uid_t)tmp;
	246	break;
	247	case opt_gid:
	248	if (match_int(&args[0], &tmp)) {
7cf3cc30	249	printk(KERN_ERR "hfs: gid requires an argument\n");
1da177e4 LT	250	return 0;
	251	}
	252	hsb->s_gid = (gid_t)tmp;
	253	break;
	254	case opt_umask:
	255	if (match_octal(&args[0], &tmp)) {
7cf3cc30	256	printk(KERN_ERR "hfs: umask requires a value\n");
1da177e4 LT	257	return 0;
	258	}
	259	hsb->s_file_umask = (umode_t)tmp;
	260	hsb->s_dir_umask = (umode_t)tmp;
	261	break;
	262	case opt_file_umask:
	263	if (match_octal(&args[0], &tmp)) {
7cf3cc30	264	printk(KERN_ERR "hfs: file_umask requires a value\n");
1da177e4 LT	265	return 0;
	266	}
	267	hsb->s_file_umask = (umode_t)tmp;
	268	break;
	269	case opt_dir_umask:
	270	if (match_octal(&args[0], &tmp)) {
7cf3cc30	271	printk(KERN_ERR "hfs: dir_umask requires a value\n");
1da177e4 LT	272	return 0;
	273	}
	274	hsb->s_dir_umask = (umode_t)tmp;
	275	break;
	276	case opt_part:
	277	if (match_int(&args[0], &hsb->part)) {
7cf3cc30	278	printk(KERN_ERR "hfs: part requires an argument\n");
1da177e4 LT	279	return 0;
	280	}
	281	break;
	282	case opt_session:
	283	if (match_int(&args[0], &hsb->session)) {
7cf3cc30	284	printk(KERN_ERR "hfs: session requires an argument\n");
1da177e4 LT	285	return 0;
	286	}
	287	break;
	288	case opt_type:
	289	if (match_fourchar(&args[0], &hsb->s_type)) {
7cf3cc30	290	printk(KERN_ERR "hfs: type requires a 4 character value\n");
1da177e4 LT	291	return 0;
	292	}
	293	break;
	294	case opt_creator:
	295	if (match_fourchar(&args[0], &hsb->s_creator)) {
7cf3cc30	296	printk(KERN_ERR "hfs: creator requires a 4 character value\n");
1da177e4 LT	297	return 0;
	298	}
	299	break;
	300	case opt_quiet:
	301	hsb->s_quiet = 1;
	302	break;
328b9227 RZ	303	case opt_codepage:
328b9227 RZ	304	if (hsb->nls_disk) {
7cf3cc30	305	printk(KERN_ERR "hfs: unable to change codepage\n");
328b9227 RZ	306	return 0;
	307	}
	308	p = match_strdup(&args[0]);
3fbe5c31 JM	309	if (p)
3fbe5c31 JM	310	hsb->nls_disk = load_nls(p);
328b9227	311	if (!hsb->nls_disk) {
7cf3cc30	312	printk(KERN_ERR "hfs: unable to load codepage \"%s\"\n", p);
328b9227 RZ	313	kfree(p);
	314	return 0;
	315	}
	316	kfree(p);
	317	break;
	318	case opt_iocharset:
	319	if (hsb->nls_io) {
7cf3cc30	320	printk(KERN_ERR "hfs: unable to change iocharset\n");
328b9227 RZ	321	return 0;
	322	}
	323	p = match_strdup(&args[0]);
3fbe5c31 JM	324	if (p)
3fbe5c31 JM	325	hsb->nls_io = load_nls(p);
328b9227	326	if (!hsb->nls_io) {
7cf3cc30	327	printk(KERN_ERR "hfs: unable to load iocharset \"%s\"\n", p);
328b9227 RZ	328	kfree(p);
	329	return 0;
	330	}
	331	kfree(p);
	332	break;
1da177e4 LT	333	default:
	334	return 0;
	335	}
	336	}
	337
328b9227 RZ	338	if (hsb->nls_disk && !hsb->nls_io) {
	339	hsb->nls_io = load_nls_default();
	340	if (!hsb->nls_io) {
7cf3cc30	341	printk(KERN_ERR "hfs: unable to load default iocharset\n");
328b9227 RZ	342	return 0;
	343	}
	344	}
1da177e4 LT	345	hsb->s_dir_umask &= 0777;
	346	hsb->s_file_umask &= 0577;
	347
	348	return 1;
	349	}
	350
	351	/*
	352	* hfs_read_super()
	353	*
	354	* This is the function that is responsible for mounting an HFS
	355	* filesystem. It performs all the tasks necessary to get enough data
	356	* from the disk to read the root inode. This includes parsing the
	357	* mount options, dealing with Macintosh partitions, reading the
	358	* superblock and the allocation bitmap blocks, calling
	359	* hfs_btree_init() to get the necessary data about the extents and
	360	* catalog B-trees and, finally, reading the root inode into memory.
	361	*/
	362	static int hfs_fill_super(struct super_block sb, void data, int silent)
	363	{
	364	struct hfs_sb_info *sbi;
	365	struct hfs_find_data fd;
	366	hfs_cat_rec rec;
	367	struct inode *root_inode;
	368	int res;
	369
f8314dc6	370	sbi = kzalloc(sizeof(struct hfs_sb_info), GFP_KERNEL);
1da177e4 LT	371	if (!sbi)
	372	return -ENOMEM;
	373	sb->s_fs_info = sbi;
1da177e4 LT	374	INIT_HLIST_HEAD(&sbi->rsrc_inodes);
	375
	376	res = -EINVAL;
	377	if (!parse_options((char *)data, sbi)) {
7cf3cc30	378	printk(KERN_ERR "hfs: unable to parse mount options.\n");
945b0920	379	goto bail;
1da177e4 LT	380	}
	381
	382	sb->s_op = &hfs_super_operations;
	383	sb->s_flags \|= MS_NODIRATIME;
3084b72d	384	mutex_init(&sbi->bitmap_lock);
1da177e4 LT	385
	386	res = hfs_mdb_get(sb);
	387	if (res) {
	388	if (!silent)
7cf3cc30	389	printk(KERN_WARNING "hfs: can't find a HFS filesystem on dev %s.\n",
1da177e4 LT	390	hfs_mdb_name(sb));
1da177e4 LT	391	res = -EINVAL;
945b0920	392	goto bail;
1da177e4 LT	393	}
	394
	395	/* try to get the root inode */
	396	hfs_find_init(HFS_SB(sb)->cat_tree, &fd);
	397	res = hfs_cat_find_brec(sb, HFS_ROOT_CNID, &fd);
	398	if (!res)
	399	hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, fd.entrylength);
	400	if (res) {
	401	hfs_find_exit(&fd);
	402	goto bail_no_root;
	403	}
d6ddf554	404	res = -EINVAL;
1da177e4 LT	405	root_inode = hfs_iget(sb, &fd.search_key->cat, &rec);
	406	hfs_find_exit(&fd);
	407	if (!root_inode)
	408	goto bail_no_root;
	409
d6ddf554	410	res = -ENOMEM;
1da177e4 LT	411	sb->s_root = d_alloc_root(root_inode);
	412	if (!sb->s_root)
	413	goto bail_iput;
	414
	415	sb->s_root->d_op = &hfs_dentry_operations;
	416
	417	/* everything's okay */
	418	return 0;
	419
	420	bail_iput:
	421	iput(root_inode);
	422	bail_no_root:
7cf3cc30	423	printk(KERN_ERR "hfs: get root inode failed.\n");
945b0920	424	bail:
1da177e4	425	hfs_mdb_put(sb);
1da177e4 LT	426	return res;
	427	}
	428
454e2398 DH	429	static int hfs_get_sb(struct file_system_type *fs_type,
	430	int flags, const char dev_name, void data,
	431	struct vfsmount *mnt)
1da177e4	432	{
454e2398	433	return get_sb_bdev(fs_type, flags, dev_name, data, hfs_fill_super, mnt);
1da177e4 LT	434	}
	435
	436	static struct file_system_type hfs_fs_type = {
	437	.owner = THIS_MODULE,
	438	.name = "hfs",
	439	.get_sb = hfs_get_sb,
	440	.kill_sb = kill_block_super,
	441	.fs_flags = FS_REQUIRES_DEV,
	442	};
	443
51cc5068	444	static void hfs_init_once(void *p)
1da177e4 LT	445	{
	446	struct hfs_inode_info *i = p;
	447
a35afb83	448	inode_init_once(&i->vfs_inode);
1da177e4 LT	449	}
	450
	451	static int __init init_hfs_fs(void)
	452	{
	453	int err;
	454
	455	hfs_inode_cachep = kmem_cache_create("hfs_inode_cache",
	456	sizeof(struct hfs_inode_info), 0, SLAB_HWCACHE_ALIGN,
20c2df83	457	hfs_init_once);
1da177e4 LT	458	if (!hfs_inode_cachep)
	459	return -ENOMEM;
	460	err = register_filesystem(&hfs_fs_type);
	461	if (err)
	462	kmem_cache_destroy(hfs_inode_cachep);
	463	return err;
	464	}
	465
	466	static void __exit exit_hfs_fs(void)
	467	{
	468	unregister_filesystem(&hfs_fs_type);
1a1d92c1	469	kmem_cache_destroy(hfs_inode_cachep);
1da177e4 LT	470	}
	471
	472	module_init(init_hfs_fs)
	473	module_exit(exit_hfs_fs)