[mirror_ubuntu-artful-kernel.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/smp_lock.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)
{
	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,
	.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;
	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) {
		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;

	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>
405f5571	22	#include <linux/smp_lock.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	{
6cfd0148 CH	81	lock_kernel();
6cfd0148 CH	82
8c85e125 CH	83	if (sb->s_dirt)
8c85e125 CH	84	hfs_write_super(sb);
1da177e4 LT	85	hfs_mdb_close(sb);
	86	/* release the MDB's resources */
	87	hfs_mdb_put(sb);
6cfd0148 CH	88
6cfd0148 CH	89	unlock_kernel();
1da177e4 LT	90	}
	91
	92	/*
	93	* hfs_statfs()
	94	*
	95	* This is the statfs() entry in the super_operations structure for
	96	* HFS filesystems. The purpose is to return various data about the
	97	* filesystem.
	98	*
	99	* changed f_files/f_ffree to reflect the fs_ablock/free_ablocks.
	100	*/
726c3342	101	static int hfs_statfs(struct dentry dentry, struct kstatfs buf)
1da177e4	102	{
726c3342	103	struct super_block *sb = dentry->d_sb;
7dd2c000	104	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
726c3342	105
1da177e4 LT	106	buf->f_type = HFS_SUPER_MAGIC;
	107	buf->f_bsize = sb->s_blocksize;
	108	buf->f_blocks = (u32)HFS_SB(sb)->fs_ablocks * HFS_SB(sb)->fs_div;
	109	buf->f_bfree = (u32)HFS_SB(sb)->free_ablocks * HFS_SB(sb)->fs_div;
	110	buf->f_bavail = buf->f_bfree;
	111	buf->f_files = HFS_SB(sb)->fs_ablocks;
	112	buf->f_ffree = HFS_SB(sb)->free_ablocks;
7dd2c000 CL	113	buf->f_fsid.val[0] = (u32)id;
7dd2c000 CL	114	buf->f_fsid.val[1] = (u32)(id >> 32);
1da177e4 LT	115	buf->f_namelen = HFS_NAMELEN;
	116
	117	return 0;
	118	}
	119
	120	static int hfs_remount(struct super_block sb, int flags, char *data)
	121	{
	122	*flags \|= MS_NODIRATIME;
	123	if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
	124	return 0;
	125	if (!(*flags & MS_RDONLY)) {
	126	if (!(HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_UNMNT))) {
7cf3cc30	127	printk(KERN_WARNING "hfs: filesystem was not cleanly unmounted, "
1da177e4 LT	128	"running fsck.hfs is recommended. leaving read-only.\n");
	129	sb->s_flags \|= MS_RDONLY;
	130	*flags \|= MS_RDONLY;
	131	} else if (HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_SLOCK)) {
7cf3cc30	132	printk(KERN_WARNING "hfs: filesystem is marked locked, leaving read-only.\n");
1da177e4 LT	133	sb->s_flags \|= MS_RDONLY;
	134	*flags \|= MS_RDONLY;
	135	}
	136	}
	137	return 0;
	138	}
	139
717dd80e RZ	140	static int hfs_show_options(struct seq_file seq, struct vfsmount mnt)
	141	{
	142	struct hfs_sb_info *sbi = HFS_SB(mnt->mnt_sb);
	143
	144	if (sbi->s_creator != cpu_to_be32(0x3f3f3f3f))
	145	seq_printf(seq, ",creator=%.4s", (char *)&sbi->s_creator);
	146	if (sbi->s_type != cpu_to_be32(0x3f3f3f3f))
	147	seq_printf(seq, ",type=%.4s", (char *)&sbi->s_type);
	148	seq_printf(seq, ",uid=%u,gid=%u", sbi->s_uid, sbi->s_gid);
	149	if (sbi->s_file_umask != 0133)
	150	seq_printf(seq, ",file_umask=%o", sbi->s_file_umask);
	151	if (sbi->s_dir_umask != 0022)
	152	seq_printf(seq, ",dir_umask=%o", sbi->s_dir_umask);
	153	if (sbi->part >= 0)
	154	seq_printf(seq, ",part=%u", sbi->part);
	155	if (sbi->session >= 0)
	156	seq_printf(seq, ",session=%u", sbi->session);
328b9227 RZ	157	if (sbi->nls_disk)
	158	seq_printf(seq, ",codepage=%s", sbi->nls_disk->charset);
	159	if (sbi->nls_io)
	160	seq_printf(seq, ",iocharset=%s", sbi->nls_io->charset);
717dd80e RZ	161	if (sbi->s_quiet)
	162	seq_printf(seq, ",quiet");
	163	return 0;
	164	}
	165
1da177e4 LT	166	static struct inode hfs_alloc_inode(struct super_block sb)
	167	{
	168	struct hfs_inode_info *i;
	169
e94b1766	170	i = kmem_cache_alloc(hfs_inode_cachep, GFP_KERNEL);
1da177e4 LT	171	return i ? &i->vfs_inode : NULL;
	172	}
	173
	174	static void hfs_destroy_inode(struct inode *inode)
	175	{
	176	kmem_cache_free(hfs_inode_cachep, HFS_I(inode));
	177	}
	178
ee9b6d61	179	static const struct super_operations hfs_super_operations = {
1da177e4 LT	180	.alloc_inode = hfs_alloc_inode,
	181	.destroy_inode = hfs_destroy_inode,
	182	.write_inode = hfs_write_inode,
	183	.clear_inode = hfs_clear_inode,
	184	.put_super = hfs_put_super,
	185	.write_super = hfs_write_super,
58bc5bbb	186	.sync_fs = hfs_sync_fs,
1da177e4 LT	187	.statfs = hfs_statfs,
1da177e4 LT	188	.remount_fs = hfs_remount,
717dd80e	189	.show_options = hfs_show_options,
1da177e4 LT	190	};
	191
	192	enum {
	193	opt_uid, opt_gid, opt_umask, opt_file_umask, opt_dir_umask,
	194	opt_part, opt_session, opt_type, opt_creator, opt_quiet,
328b9227	195	opt_codepage, opt_iocharset,
1da177e4 LT	196	opt_err
	197	};
	198
a447c093	199	static const match_table_t tokens = {
1da177e4 LT	200	{ opt_uid, "uid=%u" },
	201	{ opt_gid, "gid=%u" },
	202	{ opt_umask, "umask=%o" },
	203	{ opt_file_umask, "file_umask=%o" },
	204	{ opt_dir_umask, "dir_umask=%o" },
	205	{ opt_part, "part=%u" },
	206	{ opt_session, "session=%u" },
	207	{ opt_type, "type=%s" },
	208	{ opt_creator, "creator=%s" },
	209	{ opt_quiet, "quiet" },
328b9227 RZ	210	{ opt_codepage, "codepage=%s" },
328b9227 RZ	211	{ opt_iocharset, "iocharset=%s" },
1da177e4 LT	212	{ opt_err, NULL }
	213	};
	214
	215	static inline int match_fourchar(substring_t arg, u32 result)
	216	{
	217	if (arg->to - arg->from != 4)
	218	return -EINVAL;
	219	memcpy(result, arg->from, 4);
	220	return 0;
	221	}
	222
	223	/*
	224	* parse_options()
	225	*
	226	* adapted from linux/fs/msdos/inode.c written 1992,93 by Werner Almesberger
	227	* This function is called by hfs_read_super() to parse the mount options.
	228	*/
	229	static int parse_options(char options, struct hfs_sb_info hsb)
	230	{
	231	char *p;
	232	substring_t args[MAX_OPT_ARGS];
	233	int tmp, token;
	234
	235	/* initialize the sb with defaults */
94c9a5ee DH	236	hsb->s_uid = current_uid();
94c9a5ee DH	237	hsb->s_gid = current_gid();
1da177e4 LT	238	hsb->s_file_umask = 0133;
	239	hsb->s_dir_umask = 0022;
	240	hsb->s_type = hsb->s_creator = cpu_to_be32(0x3f3f3f3f); /* == '????' */
	241	hsb->s_quiet = 0;
	242	hsb->part = -1;
	243	hsb->session = -1;
	244
	245	if (!options)
	246	return 1;
	247
	248	while ((p = strsep(&options, ",")) != NULL) {
	249	if (!*p)
	250	continue;
	251
	252	token = match_token(p, tokens, args);
	253	switch (token) {
	254	case opt_uid:
	255	if (match_int(&args[0], &tmp)) {
7cf3cc30	256	printk(KERN_ERR "hfs: uid requires an argument\n");
1da177e4 LT	257	return 0;
	258	}
	259	hsb->s_uid = (uid_t)tmp;
	260	break;
	261	case opt_gid:
	262	if (match_int(&args[0], &tmp)) {
7cf3cc30	263	printk(KERN_ERR "hfs: gid requires an argument\n");
1da177e4 LT	264	return 0;
	265	}
	266	hsb->s_gid = (gid_t)tmp;
	267	break;
	268	case opt_umask:
	269	if (match_octal(&args[0], &tmp)) {
7cf3cc30	270	printk(KERN_ERR "hfs: umask requires a value\n");
1da177e4 LT	271	return 0;
	272	}
	273	hsb->s_file_umask = (umode_t)tmp;
	274	hsb->s_dir_umask = (umode_t)tmp;
	275	break;
	276	case opt_file_umask:
	277	if (match_octal(&args[0], &tmp)) {
7cf3cc30	278	printk(KERN_ERR "hfs: file_umask requires a value\n");
1da177e4 LT	279	return 0;
	280	}
	281	hsb->s_file_umask = (umode_t)tmp;
	282	break;
	283	case opt_dir_umask:
	284	if (match_octal(&args[0], &tmp)) {
7cf3cc30	285	printk(KERN_ERR "hfs: dir_umask requires a value\n");
1da177e4 LT	286	return 0;
	287	}
	288	hsb->s_dir_umask = (umode_t)tmp;
	289	break;
	290	case opt_part:
	291	if (match_int(&args[0], &hsb->part)) {
7cf3cc30	292	printk(KERN_ERR "hfs: part requires an argument\n");
1da177e4 LT	293	return 0;
	294	}
	295	break;
	296	case opt_session:
	297	if (match_int(&args[0], &hsb->session)) {
7cf3cc30	298	printk(KERN_ERR "hfs: session requires an argument\n");
1da177e4 LT	299	return 0;
	300	}
	301	break;
	302	case opt_type:
	303	if (match_fourchar(&args[0], &hsb->s_type)) {
7cf3cc30	304	printk(KERN_ERR "hfs: type requires a 4 character value\n");
1da177e4 LT	305	return 0;
	306	}
	307	break;
	308	case opt_creator:
	309	if (match_fourchar(&args[0], &hsb->s_creator)) {
7cf3cc30	310	printk(KERN_ERR "hfs: creator requires a 4 character value\n");
1da177e4 LT	311	return 0;
	312	}
	313	break;
	314	case opt_quiet:
	315	hsb->s_quiet = 1;
	316	break;
328b9227 RZ	317	case opt_codepage:
328b9227 RZ	318	if (hsb->nls_disk) {
7cf3cc30	319	printk(KERN_ERR "hfs: unable to change codepage\n");
328b9227 RZ	320	return 0;
	321	}
	322	p = match_strdup(&args[0]);
3fbe5c31 JM	323	if (p)
3fbe5c31 JM	324	hsb->nls_disk = load_nls(p);
328b9227	325	if (!hsb->nls_disk) {
7cf3cc30	326	printk(KERN_ERR "hfs: unable to load codepage \"%s\"\n", p);
328b9227 RZ	327	kfree(p);
	328	return 0;
	329	}
	330	kfree(p);
	331	break;
	332	case opt_iocharset:
	333	if (hsb->nls_io) {
7cf3cc30	334	printk(KERN_ERR "hfs: unable to change iocharset\n");
328b9227 RZ	335	return 0;
	336	}
	337	p = match_strdup(&args[0]);
3fbe5c31 JM	338	if (p)
3fbe5c31 JM	339	hsb->nls_io = load_nls(p);
328b9227	340	if (!hsb->nls_io) {
7cf3cc30	341	printk(KERN_ERR "hfs: unable to load iocharset \"%s\"\n", p);
328b9227 RZ	342	kfree(p);
	343	return 0;
	344	}
	345	kfree(p);
	346	break;
1da177e4 LT	347	default:
	348	return 0;
	349	}
	350	}
	351
328b9227 RZ	352	if (hsb->nls_disk && !hsb->nls_io) {
	353	hsb->nls_io = load_nls_default();
	354	if (!hsb->nls_io) {
7cf3cc30	355	printk(KERN_ERR "hfs: unable to load default iocharset\n");
328b9227 RZ	356	return 0;
	357	}
	358	}
1da177e4 LT	359	hsb->s_dir_umask &= 0777;
	360	hsb->s_file_umask &= 0577;
	361
	362	return 1;
	363	}
	364
	365	/*
	366	* hfs_read_super()
	367	*
	368	* This is the function that is responsible for mounting an HFS
	369	* filesystem. It performs all the tasks necessary to get enough data
	370	* from the disk to read the root inode. This includes parsing the
	371	* mount options, dealing with Macintosh partitions, reading the
	372	* superblock and the allocation bitmap blocks, calling
	373	* hfs_btree_init() to get the necessary data about the extents and
	374	* catalog B-trees and, finally, reading the root inode into memory.
	375	*/
	376	static int hfs_fill_super(struct super_block sb, void data, int silent)
	377	{
	378	struct hfs_sb_info *sbi;
	379	struct hfs_find_data fd;
	380	hfs_cat_rec rec;
	381	struct inode *root_inode;
	382	int res;
	383
f8314dc6	384	sbi = kzalloc(sizeof(struct hfs_sb_info), GFP_KERNEL);
1da177e4 LT	385	if (!sbi)
	386	return -ENOMEM;
	387	sb->s_fs_info = sbi;
1da177e4 LT	388	INIT_HLIST_HEAD(&sbi->rsrc_inodes);
	389
	390	res = -EINVAL;
	391	if (!parse_options((char *)data, sbi)) {
7cf3cc30	392	printk(KERN_ERR "hfs: unable to parse mount options.\n");
945b0920	393	goto bail;
1da177e4 LT	394	}
	395
	396	sb->s_op = &hfs_super_operations;
	397	sb->s_flags \|= MS_NODIRATIME;
3084b72d	398	mutex_init(&sbi->bitmap_lock);
1da177e4 LT	399
	400	res = hfs_mdb_get(sb);
	401	if (res) {
	402	if (!silent)
7cf3cc30	403	printk(KERN_WARNING "hfs: can't find a HFS filesystem on dev %s.\n",
1da177e4 LT	404	hfs_mdb_name(sb));
1da177e4 LT	405	res = -EINVAL;
945b0920	406	goto bail;
1da177e4 LT	407	}
	408
	409	/* try to get the root inode */
	410	hfs_find_init(HFS_SB(sb)->cat_tree, &fd);
	411	res = hfs_cat_find_brec(sb, HFS_ROOT_CNID, &fd);
ec81aecb AW	412	if (!res) {
	413	if (fd.entrylength > sizeof(rec) \|\| fd.entrylength < 0) {
	414	res = -EIO;
	415	goto bail;
	416	}
1da177e4	417	hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, fd.entrylength);
ec81aecb	418	}
1da177e4 LT	419	if (res) {
	420	hfs_find_exit(&fd);
	421	goto bail_no_root;
	422	}
d6ddf554	423	res = -EINVAL;
1da177e4 LT	424	root_inode = hfs_iget(sb, &fd.search_key->cat, &rec);
	425	hfs_find_exit(&fd);
	426	if (!root_inode)
	427	goto bail_no_root;
	428
d6ddf554	429	res = -ENOMEM;
1da177e4 LT	430	sb->s_root = d_alloc_root(root_inode);
	431	if (!sb->s_root)
	432	goto bail_iput;
	433
	434	sb->s_root->d_op = &hfs_dentry_operations;
	435
	436	/* everything's okay */
	437	return 0;
	438
	439	bail_iput:
	440	iput(root_inode);
	441	bail_no_root:
7cf3cc30	442	printk(KERN_ERR "hfs: get root inode failed.\n");
945b0920	443	bail:
1da177e4	444	hfs_mdb_put(sb);
1da177e4 LT	445	return res;
	446	}
	447
454e2398 DH	448	static int hfs_get_sb(struct file_system_type *fs_type,
	449	int flags, const char dev_name, void data,
	450	struct vfsmount *mnt)
1da177e4	451	{
454e2398	452	return get_sb_bdev(fs_type, flags, dev_name, data, hfs_fill_super, mnt);
1da177e4 LT	453	}
	454
	455	static struct file_system_type hfs_fs_type = {
	456	.owner = THIS_MODULE,
	457	.name = "hfs",
	458	.get_sb = hfs_get_sb,
	459	.kill_sb = kill_block_super,
	460	.fs_flags = FS_REQUIRES_DEV,
	461	};
	462
51cc5068	463	static void hfs_init_once(void *p)
1da177e4 LT	464	{
	465	struct hfs_inode_info *i = p;
	466
a35afb83	467	inode_init_once(&i->vfs_inode);
1da177e4 LT	468	}
	469
	470	static int __init init_hfs_fs(void)
	471	{
	472	int err;
	473
	474	hfs_inode_cachep = kmem_cache_create("hfs_inode_cache",
	475	sizeof(struct hfs_inode_info), 0, SLAB_HWCACHE_ALIGN,
20c2df83	476	hfs_init_once);
1da177e4 LT	477	if (!hfs_inode_cachep)
	478	return -ENOMEM;
	479	err = register_filesystem(&hfs_fs_type);
	480	if (err)
	481	kmem_cache_destroy(hfs_inode_cachep);
	482	return err;
	483	}
	484
	485	static void __exit exit_hfs_fs(void)
	486	{
	487	unregister_filesystem(&hfs_fs_type);
1a1d92c1	488	kmem_cache_destroy(hfs_inode_cachep);
1da177e4 LT	489	}
	490
	491	module_init(init_hfs_fs)
	492	module_exit(exit_hfs_fs)