[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/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)
{
	sb->s_dirt = 0;

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

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

	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 dentry *root)
{
	struct hfs_sb_info *sbi = HFS_SB(root->d_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);
	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_make_root(root_inode);
	if (!sb->s_root)
		goto bail_no_root;

	/* everything's okay */
	return 0;

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 <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>
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	{
	53	sb->s_dirt = 0;
ebc1ac16	54
1da177e4	55	/* sync everything to the buffers */
ebc1ac16 CH	56	if (!(sb->s_flags & MS_RDONLY))
ebc1ac16 CH	57	hfs_mdb_commit(sb);
1da177e4 LT	58	}
1da177e4 LT	59
58bc5bbb CH	60	static int hfs_sync_fs(struct super_block *sb, int wait)
58bc5bbb CH	61	{
58bc5bbb CH	62	hfs_mdb_commit(sb);
58bc5bbb CH	63	sb->s_dirt = 0;
58bc5bbb CH	64
	65	return 0;
	66	}
	67
1da177e4 LT	68	/*
	69	* hfs_put_super()
	70	*
	71	* This is the put_super() entry in the super_operations structure for
	72	* HFS filesystems. The purpose is to release the resources
	73	* associated with the superblock sb.
	74	*/
	75	static void hfs_put_super(struct super_block *sb)
	76	{
8c85e125 CH	77	if (sb->s_dirt)
8c85e125 CH	78	hfs_write_super(sb);
1da177e4 LT	79	hfs_mdb_close(sb);
	80	/* release the MDB's resources */
	81	hfs_mdb_put(sb);
	82	}
	83
	84	/*
	85	* hfs_statfs()
	86	*
	87	* This is the statfs() entry in the super_operations structure for
	88	* HFS filesystems. The purpose is to return various data about the
	89	* filesystem.
	90	*
	91	* changed f_files/f_ffree to reflect the fs_ablock/free_ablocks.
	92	*/
726c3342	93	static int hfs_statfs(struct dentry dentry, struct kstatfs buf)
1da177e4	94	{
726c3342	95	struct super_block *sb = dentry->d_sb;
7dd2c000	96	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
726c3342	97
1da177e4 LT	98	buf->f_type = HFS_SUPER_MAGIC;
	99	buf->f_bsize = sb->s_blocksize;
	100	buf->f_blocks = (u32)HFS_SB(sb)->fs_ablocks * HFS_SB(sb)->fs_div;
	101	buf->f_bfree = (u32)HFS_SB(sb)->free_ablocks * HFS_SB(sb)->fs_div;
	102	buf->f_bavail = buf->f_bfree;
	103	buf->f_files = HFS_SB(sb)->fs_ablocks;
	104	buf->f_ffree = HFS_SB(sb)->free_ablocks;
7dd2c000 CL	105	buf->f_fsid.val[0] = (u32)id;
7dd2c000 CL	106	buf->f_fsid.val[1] = (u32)(id >> 32);
1da177e4 LT	107	buf->f_namelen = HFS_NAMELEN;
	108
	109	return 0;
	110	}
	111
	112	static int hfs_remount(struct super_block sb, int flags, char *data)
	113	{
	114	*flags \|= MS_NODIRATIME;
	115	if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
	116	return 0;
	117	if (!(*flags & MS_RDONLY)) {
	118	if (!(HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_UNMNT))) {
7cf3cc30	119	printk(KERN_WARNING "hfs: filesystem was not cleanly unmounted, "
1da177e4 LT	120	"running fsck.hfs is recommended. leaving read-only.\n");
	121	sb->s_flags \|= MS_RDONLY;
	122	*flags \|= MS_RDONLY;
	123	} else if (HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_SLOCK)) {
7cf3cc30	124	printk(KERN_WARNING "hfs: filesystem is marked locked, leaving read-only.\n");
1da177e4 LT	125	sb->s_flags \|= MS_RDONLY;
	126	*flags \|= MS_RDONLY;
	127	}
	128	}
	129	return 0;
	130	}
	131
34c80b1d	132	static int hfs_show_options(struct seq_file seq, struct dentry root)
717dd80e	133	{
34c80b1d	134	struct hfs_sb_info *sbi = HFS_SB(root->d_sb);
717dd80e RZ	135
	136	if (sbi->s_creator != cpu_to_be32(0x3f3f3f3f))
	137	seq_printf(seq, ",creator=%.4s", (char *)&sbi->s_creator);
	138	if (sbi->s_type != cpu_to_be32(0x3f3f3f3f))
	139	seq_printf(seq, ",type=%.4s", (char *)&sbi->s_type);
	140	seq_printf(seq, ",uid=%u,gid=%u", sbi->s_uid, sbi->s_gid);
	141	if (sbi->s_file_umask != 0133)
	142	seq_printf(seq, ",file_umask=%o", sbi->s_file_umask);
	143	if (sbi->s_dir_umask != 0022)
	144	seq_printf(seq, ",dir_umask=%o", sbi->s_dir_umask);
	145	if (sbi->part >= 0)
	146	seq_printf(seq, ",part=%u", sbi->part);
	147	if (sbi->session >= 0)
	148	seq_printf(seq, ",session=%u", sbi->session);
328b9227 RZ	149	if (sbi->nls_disk)
	150	seq_printf(seq, ",codepage=%s", sbi->nls_disk->charset);
	151	if (sbi->nls_io)
	152	seq_printf(seq, ",iocharset=%s", sbi->nls_io->charset);
717dd80e RZ	153	if (sbi->s_quiet)
	154	seq_printf(seq, ",quiet");
	155	return 0;
	156	}
	157
1da177e4 LT	158	static struct inode hfs_alloc_inode(struct super_block sb)
	159	{
	160	struct hfs_inode_info *i;
	161
e94b1766	162	i = kmem_cache_alloc(hfs_inode_cachep, GFP_KERNEL);
1da177e4 LT	163	return i ? &i->vfs_inode : NULL;
	164	}
	165
fa0d7e3d	166	static void hfs_i_callback(struct rcu_head *head)
1da177e4	167	{
fa0d7e3d	168	struct inode *inode = container_of(head, struct inode, i_rcu);
1da177e4 LT	169	kmem_cache_free(hfs_inode_cachep, HFS_I(inode));
	170	}
	171
fa0d7e3d NP	172	static void hfs_destroy_inode(struct inode *inode)
	173	{
	174	call_rcu(&inode->i_rcu, hfs_i_callback);
	175	}
	176
ee9b6d61	177	static const struct super_operations hfs_super_operations = {
1da177e4 LT	178	.alloc_inode = hfs_alloc_inode,
	179	.destroy_inode = hfs_destroy_inode,
	180	.write_inode = hfs_write_inode,
b57922d9	181	.evict_inode = hfs_evict_inode,
1da177e4 LT	182	.put_super = hfs_put_super,
1da177e4 LT	183	.write_super = hfs_write_super,
58bc5bbb	184	.sync_fs = hfs_sync_fs,
1da177e4 LT	185	.statfs = hfs_statfs,
1da177e4 LT	186	.remount_fs = hfs_remount,
717dd80e	187	.show_options = hfs_show_options,
1da177e4 LT	188	};
	189
	190	enum {
	191	opt_uid, opt_gid, opt_umask, opt_file_umask, opt_dir_umask,
	192	opt_part, opt_session, opt_type, opt_creator, opt_quiet,
328b9227	193	opt_codepage, opt_iocharset,
1da177e4 LT	194	opt_err
	195	};
	196
a447c093	197	static const match_table_t tokens = {
1da177e4 LT	198	{ opt_uid, "uid=%u" },
	199	{ opt_gid, "gid=%u" },
	200	{ opt_umask, "umask=%o" },
	201	{ opt_file_umask, "file_umask=%o" },
	202	{ opt_dir_umask, "dir_umask=%o" },
	203	{ opt_part, "part=%u" },
	204	{ opt_session, "session=%u" },
	205	{ opt_type, "type=%s" },
	206	{ opt_creator, "creator=%s" },
	207	{ opt_quiet, "quiet" },
328b9227 RZ	208	{ opt_codepage, "codepage=%s" },
328b9227 RZ	209	{ opt_iocharset, "iocharset=%s" },
1da177e4 LT	210	{ opt_err, NULL }
	211	};
	212
	213	static inline int match_fourchar(substring_t arg, u32 result)
	214	{
	215	if (arg->to - arg->from != 4)
	216	return -EINVAL;
	217	memcpy(result, arg->from, 4);
	218	return 0;
	219	}
	220
	221	/*
	222	* parse_options()
	223	*
	224	* adapted from linux/fs/msdos/inode.c written 1992,93 by Werner Almesberger
	225	* This function is called by hfs_read_super() to parse the mount options.
	226	*/
	227	static int parse_options(char options, struct hfs_sb_info hsb)
	228	{
	229	char *p;
	230	substring_t args[MAX_OPT_ARGS];
	231	int tmp, token;
	232
	233	/* initialize the sb with defaults */
94c9a5ee DH	234	hsb->s_uid = current_uid();
94c9a5ee DH	235	hsb->s_gid = current_gid();
1da177e4 LT	236	hsb->s_file_umask = 0133;
	237	hsb->s_dir_umask = 0022;
	238	hsb->s_type = hsb->s_creator = cpu_to_be32(0x3f3f3f3f); /* == '????' */
	239	hsb->s_quiet = 0;
	240	hsb->part = -1;
	241	hsb->session = -1;
	242
	243	if (!options)
	244	return 1;
	245
	246	while ((p = strsep(&options, ",")) != NULL) {
	247	if (!*p)
	248	continue;
	249
	250	token = match_token(p, tokens, args);
	251	switch (token) {
	252	case opt_uid:
	253	if (match_int(&args[0], &tmp)) {
7cf3cc30	254	printk(KERN_ERR "hfs: uid requires an argument\n");
1da177e4 LT	255	return 0;
	256	}
	257	hsb->s_uid = (uid_t)tmp;
	258	break;
	259	case opt_gid:
	260	if (match_int(&args[0], &tmp)) {
7cf3cc30	261	printk(KERN_ERR "hfs: gid requires an argument\n");
1da177e4 LT	262	return 0;
	263	}
	264	hsb->s_gid = (gid_t)tmp;
	265	break;
	266	case opt_umask:
	267	if (match_octal(&args[0], &tmp)) {
7cf3cc30	268	printk(KERN_ERR "hfs: umask requires a value\n");
1da177e4 LT	269	return 0;
	270	}
	271	hsb->s_file_umask = (umode_t)tmp;
	272	hsb->s_dir_umask = (umode_t)tmp;
	273	break;
	274	case opt_file_umask:
	275	if (match_octal(&args[0], &tmp)) {
7cf3cc30	276	printk(KERN_ERR "hfs: file_umask requires a value\n");
1da177e4 LT	277	return 0;
	278	}
	279	hsb->s_file_umask = (umode_t)tmp;
	280	break;
	281	case opt_dir_umask:
	282	if (match_octal(&args[0], &tmp)) {
7cf3cc30	283	printk(KERN_ERR "hfs: dir_umask requires a value\n");
1da177e4 LT	284	return 0;
	285	}
	286	hsb->s_dir_umask = (umode_t)tmp;
	287	break;
	288	case opt_part:
	289	if (match_int(&args[0], &hsb->part)) {
7cf3cc30	290	printk(KERN_ERR "hfs: part requires an argument\n");
1da177e4 LT	291	return 0;
	292	}
	293	break;
	294	case opt_session:
	295	if (match_int(&args[0], &hsb->session)) {
7cf3cc30	296	printk(KERN_ERR "hfs: session requires an argument\n");
1da177e4 LT	297	return 0;
	298	}
	299	break;
	300	case opt_type:
	301	if (match_fourchar(&args[0], &hsb->s_type)) {
7cf3cc30	302	printk(KERN_ERR "hfs: type requires a 4 character value\n");
1da177e4 LT	303	return 0;
	304	}
	305	break;
	306	case opt_creator:
	307	if (match_fourchar(&args[0], &hsb->s_creator)) {
7cf3cc30	308	printk(KERN_ERR "hfs: creator requires a 4 character value\n");
1da177e4 LT	309	return 0;
	310	}
	311	break;
	312	case opt_quiet:
	313	hsb->s_quiet = 1;
	314	break;
328b9227 RZ	315	case opt_codepage:
328b9227 RZ	316	if (hsb->nls_disk) {
7cf3cc30	317	printk(KERN_ERR "hfs: unable to change codepage\n");
328b9227 RZ	318	return 0;
	319	}
	320	p = match_strdup(&args[0]);
3fbe5c31 JM	321	if (p)
3fbe5c31 JM	322	hsb->nls_disk = load_nls(p);
328b9227	323	if (!hsb->nls_disk) {
7cf3cc30	324	printk(KERN_ERR "hfs: unable to load codepage \"%s\"\n", p);
328b9227 RZ	325	kfree(p);
	326	return 0;
	327	}
	328	kfree(p);
	329	break;
	330	case opt_iocharset:
	331	if (hsb->nls_io) {
7cf3cc30	332	printk(KERN_ERR "hfs: unable to change iocharset\n");
328b9227 RZ	333	return 0;
	334	}
	335	p = match_strdup(&args[0]);
3fbe5c31 JM	336	if (p)
3fbe5c31 JM	337	hsb->nls_io = load_nls(p);
328b9227	338	if (!hsb->nls_io) {
7cf3cc30	339	printk(KERN_ERR "hfs: unable to load iocharset \"%s\"\n", p);
328b9227 RZ	340	kfree(p);
	341	return 0;
	342	}
	343	kfree(p);
	344	break;
1da177e4 LT	345	default:
	346	return 0;
	347	}
	348	}
	349
328b9227 RZ	350	if (hsb->nls_disk && !hsb->nls_io) {
	351	hsb->nls_io = load_nls_default();
	352	if (!hsb->nls_io) {
7cf3cc30	353	printk(KERN_ERR "hfs: unable to load default iocharset\n");
328b9227 RZ	354	return 0;
	355	}
	356	}
1da177e4 LT	357	hsb->s_dir_umask &= 0777;
	358	hsb->s_file_umask &= 0577;
	359
	360	return 1;
	361	}
	362
	363	/*
	364	* hfs_read_super()
	365	*
	366	* This is the function that is responsible for mounting an HFS
	367	* filesystem. It performs all the tasks necessary to get enough data
	368	* from the disk to read the root inode. This includes parsing the
	369	* mount options, dealing with Macintosh partitions, reading the
	370	* superblock and the allocation bitmap blocks, calling
	371	* hfs_btree_init() to get the necessary data about the extents and
	372	* catalog B-trees and, finally, reading the root inode into memory.
	373	*/
	374	static int hfs_fill_super(struct super_block sb, void data, int silent)
	375	{
	376	struct hfs_sb_info *sbi;
	377	struct hfs_find_data fd;
	378	hfs_cat_rec rec;
	379	struct inode *root_inode;
	380	int res;
	381
f8314dc6	382	sbi = kzalloc(sizeof(struct hfs_sb_info), GFP_KERNEL);
8526fb37	383	if (!sbi)
1da177e4	384	return -ENOMEM;
8526fb37	385
1da177e4	386	sb->s_fs_info = sbi;
1da177e4 LT	387
	388	res = -EINVAL;
	389	if (!parse_options((char *)data, sbi)) {
7cf3cc30	390	printk(KERN_ERR "hfs: unable to parse mount options.\n");
945b0920	391	goto bail;
1da177e4 LT	392	}
	393
	394	sb->s_op = &hfs_super_operations;
	395	sb->s_flags \|= MS_NODIRATIME;
3084b72d	396	mutex_init(&sbi->bitmap_lock);
1da177e4 LT	397
	398	res = hfs_mdb_get(sb);
	399	if (res) {
	400	if (!silent)
7cf3cc30	401	printk(KERN_WARNING "hfs: can't find a HFS filesystem on dev %s.\n",
1da177e4 LT	402	hfs_mdb_name(sb));
1da177e4 LT	403	res = -EINVAL;
945b0920	404	goto bail;
1da177e4 LT	405	}
	406
	407	/* try to get the root inode */
	408	hfs_find_init(HFS_SB(sb)->cat_tree, &fd);
	409	res = hfs_cat_find_brec(sb, HFS_ROOT_CNID, &fd);
ec81aecb AW	410	if (!res) {
	411	if (fd.entrylength > sizeof(rec) \|\| fd.entrylength < 0) {
	412	res = -EIO;
	413	goto bail;
	414	}
1da177e4	415	hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, fd.entrylength);
ec81aecb	416	}
1da177e4 LT	417	if (res) {
	418	hfs_find_exit(&fd);
	419	goto bail_no_root;
	420	}
d6ddf554	421	res = -EINVAL;
1da177e4 LT	422	root_inode = hfs_iget(sb, &fd.search_key->cat, &rec);
	423	hfs_find_exit(&fd);
	424	if (!root_inode)
	425	goto bail_no_root;
	426
518c79d2	427	sb->s_d_op = &hfs_dentry_operations;
d6ddf554	428	res = -ENOMEM;
48fde701	429	sb->s_root = d_make_root(root_inode);
1da177e4	430	if (!sb->s_root)
48fde701	431	goto bail_no_root;
1da177e4	432
1da177e4 LT	433	/* everything's okay */
	434	return 0;
	435
1da177e4	436	bail_no_root:
7cf3cc30	437	printk(KERN_ERR "hfs: get root inode failed.\n");
945b0920	438	bail:
1da177e4	439	hfs_mdb_put(sb);
1da177e4 LT	440	return res;
	441	}
	442
152a0836 AV	443	static struct dentry hfs_mount(struct file_system_type fs_type,
152a0836 AV	444	int flags, const char dev_name, void data)
1da177e4	445	{
152a0836	446	return mount_bdev(fs_type, flags, dev_name, data, hfs_fill_super);
1da177e4 LT	447	}
	448
	449	static struct file_system_type hfs_fs_type = {
	450	.owner = THIS_MODULE,
	451	.name = "hfs",
152a0836	452	.mount = hfs_mount,
1da177e4 LT	453	.kill_sb = kill_block_super,
	454	.fs_flags = FS_REQUIRES_DEV,
	455	};
	456
51cc5068	457	static void hfs_init_once(void *p)
1da177e4 LT	458	{
	459	struct hfs_inode_info *i = p;
	460
a35afb83	461	inode_init_once(&i->vfs_inode);
1da177e4 LT	462	}
	463
	464	static int __init init_hfs_fs(void)
	465	{
	466	int err;
	467
	468	hfs_inode_cachep = kmem_cache_create("hfs_inode_cache",
	469	sizeof(struct hfs_inode_info), 0, SLAB_HWCACHE_ALIGN,
20c2df83	470	hfs_init_once);
1da177e4 LT	471	if (!hfs_inode_cachep)
	472	return -ENOMEM;
	473	err = register_filesystem(&hfs_fs_type);
	474	if (err)
	475	kmem_cache_destroy(hfs_inode_cachep);
	476	return err;
	477	}
	478
	479	static void __exit exit_hfs_fs(void)
	480	{
	481	unregister_filesystem(&hfs_fs_type);
1a1d92c1	482	kmem_cache_destroy(hfs_inode_cachep);
1da177e4 LT	483	}
	484
	485	module_init(init_hfs_fs)
	486	module_exit(exit_hfs_fs)