[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_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/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("HFS-fs warning: 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("HFS-fs: 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->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_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_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("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("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("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("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("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("HFS: part requires an argument\n");
				return 0;
			}
			break;
		case opt_session:
			if (match_int(&args[0], &hsb->session)) {
				printk("HFS: session requires an argument\n");
				return 0;
			}
			break;
		case opt_type:
			if (match_fourchar(&args[0], &hsb->s_type)) {
				printk("HFS+-fs: type requires a 4 character value\n");
				return 0;
			}
			break;
		case opt_creator:
			if (match_fourchar(&args[0], &hsb->s_creator)) {
				printk("HFS+-fs: creator requires a 4 character value\n");
				return 0;
			}
			break;
		case opt_quiet:
			hsb->s_quiet = 1;
			break;
		default:
			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)) {
		hfs_warn("hfs_fs: 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)
			hfs_warn("VFS: 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:
	hfs_warn("hfs_fs: get root inode failed.\n");
bail:
	hfs_mdb_put(sb);
	return res;
}

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

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