[GitHub/mt8127/android_kernel_alcatel_ttab.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_module() and cleanup_module().	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/config.h>
#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 kmem_cache_t *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 super_block *sb, struct kstatfs *buf)
{
	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_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, SLAB_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 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 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]);
			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]);
			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 = kmalloc(sizeof(struct hfs_sb_info), GFP_KERNEL);
	if (!sbi)
		return -ENOMEM;
	sb->s_fs_info = sbi;
	memset(sbi, 0, sizeof(struct hfs_sb_info));
	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;
	init_MUTEX(&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;
	}
	root_inode = hfs_iget(sb, &fd.search_key->cat, &rec);
	hfs_find_exit(&fd);
	if (!root_inode)
		goto bail_no_root;

	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, kmem_cache_t *cachep, unsigned long flags)
{
	struct hfs_inode_info *i = p;

	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == SLAB_CTOR_CONSTRUCTOR)
		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, NULL);
	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);
	if (kmem_cache_destroy(hfs_inode_cachep))
		printk(KERN_ERR "hfs_inode_cache: not all structures were freed\n");
}

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
	9	* init_module() and cleanup_module(). The remaining super_ops are in
	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
	15	#include <linux/config.h>
	16	#include <linux/module.h>
	17	#include <linux/blkdev.h>
717dd80e	18	#include <linux/mount.h>
1da177e4	19	#include <linux/init.h>
328b9227	20	#include <linux/nls.h>
1da177e4	21	#include <linux/parser.h>
717dd80e	22	#include <linux/seq_file.h>
1da177e4 LT	23	#include <linux/vfs.h>
	24
	25	#include "hfs_fs.h"
	26	#include "btree.h"
	27
	28	static kmem_cache_t *hfs_inode_cachep;
	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;
	54	if (sb->s_flags & MS_RDONLY)
	55	return;
	56	/* sync everything to the buffers */
	57	hfs_mdb_commit(sb);
	58	}
	59
	60	/*
	61	* hfs_put_super()
	62	*
	63	* This is the put_super() entry in the super_operations structure for
	64	* HFS filesystems. The purpose is to release the resources
	65	* associated with the superblock sb.
	66	*/
	67	static void hfs_put_super(struct super_block *sb)
	68	{
	69	hfs_mdb_close(sb);
	70	/* release the MDB's resources */
	71	hfs_mdb_put(sb);
	72	}
	73
	74	/*
	75	* hfs_statfs()
	76	*
	77	* This is the statfs() entry in the super_operations structure for
	78	* HFS filesystems. The purpose is to return various data about the
	79	* filesystem.
	80	*
	81	* changed f_files/f_ffree to reflect the fs_ablock/free_ablocks.
	82	*/
	83	static int hfs_statfs(struct super_block sb, struct kstatfs buf)
	84	{
	85	buf->f_type = HFS_SUPER_MAGIC;
	86	buf->f_bsize = sb->s_blocksize;
87	buf->f_blocks = (u32)HFS_SB(sb)->fs_ablocks * HFS_SB(sb)->fs_div;
88	buf->f_bfree = (u32)HFS_SB(sb)->free_ablocks * HFS_SB(sb)->fs_div;
89	buf->f_bavail = buf->f_bfree;
90	buf->f_files = HFS_SB(sb)->fs_ablocks;
91	buf->f_ffree = HFS_SB(sb)->free_ablocks;
92	buf->f_namelen = HFS_NAMELEN;
93
94	return 0;
95	}
96
97	static int hfs_remount(struct super_block sb, int flags, char *data)
98	{
99	*flags \|= MS_NODIRATIME;
100	if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
101	return 0;
102	if (!(*flags & MS_RDONLY)) {
103	if (!(HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_UNMNT))) {
7cf3cc30	104	printk(KERN_WARNING "hfs: filesystem was not cleanly unmounted, "
1da177e4 LT	105	"running fsck.hfs is recommended. leaving read-only.\n");
	106	sb->s_flags \|= MS_RDONLY;
	107	*flags \|= MS_RDONLY;
	108	} else if (HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_SLOCK)) {
7cf3cc30	109	printk(KERN_WARNING "hfs: filesystem is marked locked, leaving read-only.\n");
1da177e4 LT	110	sb->s_flags \|= MS_RDONLY;
	111	*flags \|= MS_RDONLY;
	112	}
	113	}
	114	return 0;
	115	}
	116
717dd80e RZ	117	static int hfs_show_options(struct seq_file seq, struct vfsmount mnt)
	118	{
	119	struct hfs_sb_info *sbi = HFS_SB(mnt->mnt_sb);
	120
	121	if (sbi->s_creator != cpu_to_be32(0x3f3f3f3f))
	122	seq_printf(seq, ",creator=%.4s", (char *)&sbi->s_creator);
	123	if (sbi->s_type != cpu_to_be32(0x3f3f3f3f))
	124	seq_printf(seq, ",type=%.4s", (char *)&sbi->s_type);
	125	seq_printf(seq, ",uid=%u,gid=%u", sbi->s_uid, sbi->s_gid);
	126	if (sbi->s_file_umask != 0133)
	127	seq_printf(seq, ",file_umask=%o", sbi->s_file_umask);
	128	if (sbi->s_dir_umask != 0022)
	129	seq_printf(seq, ",dir_umask=%o", sbi->s_dir_umask);
	130	if (sbi->part >= 0)
	131	seq_printf(seq, ",part=%u", sbi->part);
	132	if (sbi->session >= 0)
	133	seq_printf(seq, ",session=%u", sbi->session);
328b9227 RZ	134	if (sbi->nls_disk)
	135	seq_printf(seq, ",codepage=%s", sbi->nls_disk->charset);
	136	if (sbi->nls_io)
	137	seq_printf(seq, ",iocharset=%s", sbi->nls_io->charset);
717dd80e RZ	138	if (sbi->s_quiet)
	139	seq_printf(seq, ",quiet");
	140	return 0;
	141	}
	142
1da177e4 LT	143	static struct inode hfs_alloc_inode(struct super_block sb)
	144	{
	145	struct hfs_inode_info *i;
	146
	147	i = kmem_cache_alloc(hfs_inode_cachep, SLAB_KERNEL);
	148	return i ? &i->vfs_inode : NULL;
	149	}
	150
	151	static void hfs_destroy_inode(struct inode *inode)
	152	{
	153	kmem_cache_free(hfs_inode_cachep, HFS_I(inode));
	154	}
	155
	156	static struct super_operations hfs_super_operations = {
	157	.alloc_inode = hfs_alloc_inode,
	158	.destroy_inode = hfs_destroy_inode,
	159	.write_inode = hfs_write_inode,
	160	.clear_inode = hfs_clear_inode,
	161	.put_super = hfs_put_super,
	162	.write_super = hfs_write_super,
	163	.statfs = hfs_statfs,
	164	.remount_fs = hfs_remount,
717dd80e	165	.show_options = hfs_show_options,
1da177e4 LT	166	};
	167
	168	enum {
	169	opt_uid, opt_gid, opt_umask, opt_file_umask, opt_dir_umask,
	170	opt_part, opt_session, opt_type, opt_creator, opt_quiet,
328b9227	171	opt_codepage, opt_iocharset,
1da177e4 LT	172	opt_err
	173	};
	174
	175	static match_table_t tokens = {
	176	{ opt_uid, "uid=%u" },
	177	{ opt_gid, "gid=%u" },
	178	{ opt_umask, "umask=%o" },
	179	{ opt_file_umask, "file_umask=%o" },
	180	{ opt_dir_umask, "dir_umask=%o" },
	181	{ opt_part, "part=%u" },
	182	{ opt_session, "session=%u" },
	183	{ opt_type, "type=%s" },
	184	{ opt_creator, "creator=%s" },
	185	{ opt_quiet, "quiet" },
328b9227 RZ	186	{ opt_codepage, "codepage=%s" },
328b9227 RZ	187	{ opt_iocharset, "iocharset=%s" },
1da177e4 LT	188	{ opt_err, NULL }
	189	};
	190
	191	static inline int match_fourchar(substring_t arg, u32 result)
	192	{
	193	if (arg->to - arg->from != 4)
	194	return -EINVAL;
	195	memcpy(result, arg->from, 4);
	196	return 0;
	197	}
	198
	199	/*
	200	* parse_options()
	201	*
	202	* adapted from linux/fs/msdos/inode.c written 1992,93 by Werner Almesberger
	203	* This function is called by hfs_read_super() to parse the mount options.
	204	*/
	205	static int parse_options(char options, struct hfs_sb_info hsb)
	206	{
	207	char *p;
	208	substring_t args[MAX_OPT_ARGS];
	209	int tmp, token;
	210
	211	/* initialize the sb with defaults */
	212	hsb->s_uid = current->uid;
	213	hsb->s_gid = current->gid;
	214	hsb->s_file_umask = 0133;
	215	hsb->s_dir_umask = 0022;
	216	hsb->s_type = hsb->s_creator = cpu_to_be32(0x3f3f3f3f); /* == '????' */
	217	hsb->s_quiet = 0;
	218	hsb->part = -1;
	219	hsb->session = -1;
	220
	221	if (!options)
	222	return 1;
	223
	224	while ((p = strsep(&options, ",")) != NULL) {
	225	if (!*p)
	226	continue;
	227
	228	token = match_token(p, tokens, args);
	229	switch (token) {
	230	case opt_uid:
	231	if (match_int(&args[0], &tmp)) {
7cf3cc30	232	printk(KERN_ERR "hfs: uid requires an argument\n");
1da177e4 LT	233	return 0;
	234	}
	235	hsb->s_uid = (uid_t)tmp;
	236	break;
	237	case opt_gid:
	238	if (match_int(&args[0], &tmp)) {
7cf3cc30	239	printk(KERN_ERR "hfs: gid requires an argument\n");
1da177e4 LT	240	return 0;
	241	}
	242	hsb->s_gid = (gid_t)tmp;
	243	break;
	244	case opt_umask:
	245	if (match_octal(&args[0], &tmp)) {
7cf3cc30	246	printk(KERN_ERR "hfs: umask requires a value\n");
1da177e4 LT	247	return 0;
	248	}
	249	hsb->s_file_umask = (umode_t)tmp;
	250	hsb->s_dir_umask = (umode_t)tmp;
	251	break;
	252	case opt_file_umask:
	253	if (match_octal(&args[0], &tmp)) {
7cf3cc30	254	printk(KERN_ERR "hfs: file_umask requires a value\n");
1da177e4 LT	255	return 0;
	256	}
	257	hsb->s_file_umask = (umode_t)tmp;
	258	break;
	259	case opt_dir_umask:
	260	if (match_octal(&args[0], &tmp)) {
7cf3cc30	261	printk(KERN_ERR "hfs: dir_umask requires a value\n");
1da177e4 LT	262	return 0;
	263	}
	264	hsb->s_dir_umask = (umode_t)tmp;
	265	break;
	266	case opt_part:
	267	if (match_int(&args[0], &hsb->part)) {
7cf3cc30	268	printk(KERN_ERR "hfs: part requires an argument\n");
1da177e4 LT	269	return 0;
	270	}
	271	break;
	272	case opt_session:
	273	if (match_int(&args[0], &hsb->session)) {
7cf3cc30	274	printk(KERN_ERR "hfs: session requires an argument\n");
1da177e4 LT	275	return 0;
	276	}
	277	break;
	278	case opt_type:
	279	if (match_fourchar(&args[0], &hsb->s_type)) {
7cf3cc30	280	printk(KERN_ERR "hfs: type requires a 4 character value\n");
1da177e4 LT	281	return 0;
	282	}
	283	break;
	284	case opt_creator:
	285	if (match_fourchar(&args[0], &hsb->s_creator)) {
7cf3cc30	286	printk(KERN_ERR "hfs: creator requires a 4 character value\n");
1da177e4 LT	287	return 0;
	288	}
	289	break;
	290	case opt_quiet:
	291	hsb->s_quiet = 1;
	292	break;
328b9227 RZ	293	case opt_codepage:
328b9227 RZ	294	if (hsb->nls_disk) {
7cf3cc30	295	printk(KERN_ERR "hfs: unable to change codepage\n");
328b9227 RZ	296	return 0;
	297	}
	298	p = match_strdup(&args[0]);
	299	hsb->nls_disk = load_nls(p);
	300	if (!hsb->nls_disk) {
7cf3cc30	301	printk(KERN_ERR "hfs: unable to load codepage \"%s\"\n", p);
328b9227 RZ	302	kfree(p);
	303	return 0;
	304	}
	305	kfree(p);
	306	break;
	307	case opt_iocharset:
	308	if (hsb->nls_io) {
7cf3cc30	309	printk(KERN_ERR "hfs: unable to change iocharset\n");
328b9227 RZ	310	return 0;
	311	}
	312	p = match_strdup(&args[0]);
	313	hsb->nls_io = load_nls(p);
	314	if (!hsb->nls_io) {
7cf3cc30	315	printk(KERN_ERR "hfs: unable to load iocharset \"%s\"\n", p);
328b9227 RZ	316	kfree(p);
	317	return 0;
	318	}
	319	kfree(p);
	320	break;
1da177e4 LT	321	default:
	322	return 0;
	323	}
	324	}
	325
328b9227 RZ	326	if (hsb->nls_disk && !hsb->nls_io) {
	327	hsb->nls_io = load_nls_default();
	328	if (!hsb->nls_io) {
7cf3cc30	329	printk(KERN_ERR "hfs: unable to load default iocharset\n");
328b9227 RZ	330	return 0;
	331	}
	332	}
1da177e4 LT	333	hsb->s_dir_umask &= 0777;
	334	hsb->s_file_umask &= 0577;
	335
	336	return 1;
	337	}
	338
	339	/*
	340	* hfs_read_super()
	341	*
	342	* This is the function that is responsible for mounting an HFS
	343	* filesystem. It performs all the tasks necessary to get enough data
	344	* from the disk to read the root inode. This includes parsing the
	345	* mount options, dealing with Macintosh partitions, reading the
	346	* superblock and the allocation bitmap blocks, calling
	347	* hfs_btree_init() to get the necessary data about the extents and
	348	* catalog B-trees and, finally, reading the root inode into memory.
	349	*/
	350	static int hfs_fill_super(struct super_block sb, void data, int silent)
	351	{
	352	struct hfs_sb_info *sbi;
	353	struct hfs_find_data fd;
	354	hfs_cat_rec rec;
	355	struct inode *root_inode;
	356	int res;
	357
	358	sbi = kmalloc(sizeof(struct hfs_sb_info), GFP_KERNEL);
	359	if (!sbi)
	360	return -ENOMEM;
	361	sb->s_fs_info = sbi;
	362	memset(sbi, 0, sizeof(struct hfs_sb_info));
	363	INIT_HLIST_HEAD(&sbi->rsrc_inodes);
	364
	365	res = -EINVAL;
	366	if (!parse_options((char *)data, sbi)) {
7cf3cc30	367	printk(KERN_ERR "hfs: unable to parse mount options.\n");
945b0920	368	goto bail;
1da177e4 LT	369	}
	370
	371	sb->s_op = &hfs_super_operations;
	372	sb->s_flags \|= MS_NODIRATIME;
	373	init_MUTEX(&sbi->bitmap_lock);
	374
	375	res = hfs_mdb_get(sb);
	376	if (res) {
	377	if (!silent)
7cf3cc30	378	printk(KERN_WARNING "hfs: can't find a HFS filesystem on dev %s.\n",
1da177e4 LT	379	hfs_mdb_name(sb));
1da177e4 LT	380	res = -EINVAL;
945b0920	381	goto bail;
1da177e4 LT	382	}
	383
	384	/* try to get the root inode */
	385	hfs_find_init(HFS_SB(sb)->cat_tree, &fd);
	386	res = hfs_cat_find_brec(sb, HFS_ROOT_CNID, &fd);
	387	if (!res)
	388	hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, fd.entrylength);
	389	if (res) {
	390	hfs_find_exit(&fd);
	391	goto bail_no_root;
	392	}
	393	root_inode = hfs_iget(sb, &fd.search_key->cat, &rec);
	394	hfs_find_exit(&fd);
	395	if (!root_inode)
	396	goto bail_no_root;
	397
	398	sb->s_root = d_alloc_root(root_inode);
	399	if (!sb->s_root)
	400	goto bail_iput;
	401
	402	sb->s_root->d_op = &hfs_dentry_operations;
	403
	404	/* everything's okay */
	405	return 0;
	406
	407	bail_iput:
	408	iput(root_inode);
	409	bail_no_root:
7cf3cc30	410	printk(KERN_ERR "hfs: get root inode failed.\n");
945b0920	411	bail:
1da177e4	412	hfs_mdb_put(sb);
1da177e4 LT	413	return res;
	414	}
	415
454e2398 DH	416	static int hfs_get_sb(struct file_system_type *fs_type,
	417	int flags, const char dev_name, void data,
	418	struct vfsmount *mnt)
1da177e4	419	{
454e2398	420	return get_sb_bdev(fs_type, flags, dev_name, data, hfs_fill_super, mnt);
1da177e4 LT	421	}
	422
	423	static struct file_system_type hfs_fs_type = {
	424	.owner = THIS_MODULE,
	425	.name = "hfs",
	426	.get_sb = hfs_get_sb,
	427	.kill_sb = kill_block_super,
	428	.fs_flags = FS_REQUIRES_DEV,
	429	};
	430
	431	static void hfs_init_once(void p, kmem_cache_t cachep, unsigned long flags)
	432	{
	433	struct hfs_inode_info *i = p;
	434
	435	if ((flags & (SLAB_CTOR_VERIFY\|SLAB_CTOR_CONSTRUCTOR)) == SLAB_CTOR_CONSTRUCTOR)
	436	inode_init_once(&i->vfs_inode);
	437	}
	438
	439	static int __init init_hfs_fs(void)
	440	{
	441	int err;
	442
	443	hfs_inode_cachep = kmem_cache_create("hfs_inode_cache",
	444	sizeof(struct hfs_inode_info), 0, SLAB_HWCACHE_ALIGN,
	445	hfs_init_once, NULL);
	446	if (!hfs_inode_cachep)
	447	return -ENOMEM;
	448	err = register_filesystem(&hfs_fs_type);
	449	if (err)
	450	kmem_cache_destroy(hfs_inode_cachep);
	451	return err;
	452	}
	453
	454	static void __exit exit_hfs_fs(void)
	455	{
	456	unregister_filesystem(&hfs_fs_type);
	457	if (kmem_cache_destroy(hfs_inode_cachep))
7cf3cc30	458	printk(KERN_ERR "hfs_inode_cache: not all structures were freed\n");
1da177e4 LT	459	}
	460
	461	module_init(init_hfs_fs)
	462	module_exit(exit_hfs_fs)