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