[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/backing-dev.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");

static int hfs_sync_fs(struct super_block *sb, int wait)
{
	hfs_mdb_commit(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)
{
	cancel_delayed_work_sync(&HFS_SB(sb)->mdb_work);
	hfs_mdb_close(sb);
	/* release the MDB's resources */
	hfs_mdb_put(sb);
}

static void flush_mdb(struct work_struct *work)
{
	struct hfs_sb_info *sbi;
	struct super_block *sb;

	sbi = container_of(work, struct hfs_sb_info, mdb_work.work);
	sb = sbi->sb;

	spin_lock(&sbi->work_lock);
	sbi->work_queued = 0;
	spin_unlock(&sbi->work_lock);

	hfs_mdb_commit(sb);
}

void hfs_mark_mdb_dirty(struct super_block *sb)
{
	struct hfs_sb_info *sbi = HFS_SB(sb);
	unsigned long delay;

	if (sb->s_flags & MS_RDONLY)
		return;

	spin_lock(&sbi->work_lock);
	if (!sbi->work_queued) {
		delay = msecs_to_jiffies(dirty_writeback_interval * 10);
		queue_delayed_work(system_long_wq, &sbi->mdb_work, delay);
		sbi->work_queued = 1;
	}
	spin_unlock(&sbi->work_lock);
}

/*
 * 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)
{
	sync_filesystem(sb);
	*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))) {
			pr_warn("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)) {
			pr_warn("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_show_option_n(seq, "creator", (char *)&sbi->s_creator, 4);
	if (sbi->s_type != cpu_to_be32(0x3f3f3f3f))
		seq_show_option_n(seq, "type", (char *)&sbi->s_type, 4);
	seq_printf(seq, ",uid=%u,gid=%u",
			from_kuid_munged(&init_user_ns, sbi->s_uid),
			from_kgid_munged(&init_user_ns, 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,
	.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)) {
				pr_err("uid requires an argument\n");
				return 0;
			}
			hsb->s_uid = make_kuid(current_user_ns(), (uid_t)tmp);
			if (!uid_valid(hsb->s_uid)) {
				pr_err("invalid uid %d\n", tmp);
				return 0;
			}
			break;
		case opt_gid:
			if (match_int(&args[0], &tmp)) {
				pr_err("gid requires an argument\n");
				return 0;
			}
			hsb->s_gid = make_kgid(current_user_ns(), (gid_t)tmp);
			if (!gid_valid(hsb->s_gid)) {
				pr_err("invalid gid %d\n", tmp);
				return 0;
			}
			break;
		case opt_umask:
			if (match_octal(&args[0], &tmp)) {
				pr_err("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)) {
				pr_err("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)) {
				pr_err("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)) {
				pr_err("part requires an argument\n");
				return 0;
			}
			break;
		case opt_session:
			if (match_int(&args[0], &hsb->session)) {
				pr_err("session requires an argument\n");
				return 0;
			}
			break;
		case opt_type:
			if (match_fourchar(&args[0], &hsb->s_type)) {
				pr_err("type requires a 4 character value\n");
				return 0;
			}
			break;
		case opt_creator:
			if (match_fourchar(&args[0], &hsb->s_creator)) {
				pr_err("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) {
				pr_err("unable to change codepage\n");
				return 0;
			}
			p = match_strdup(&args[0]);
			if (p)
				hsb->nls_disk = load_nls(p);
			if (!hsb->nls_disk) {
				pr_err("unable to load codepage \"%s\"\n", p);
				kfree(p);
				return 0;
			}
			kfree(p);
			break;
		case opt_iocharset:
			if (hsb->nls_io) {
				pr_err("unable to change iocharset\n");
				return 0;
			}
			p = match_strdup(&args[0]);
			if (p)
				hsb->nls_io = load_nls(p);
			if (!hsb->nls_io) {
				pr_err("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) {
			pr_err("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;

	sbi->sb = sb;
	sb->s_fs_info = sbi;
	spin_lock_init(&sbi->work_lock);
	INIT_DELAYED_WORK(&sbi->mdb_work, flush_mdb);

	res = -EINVAL;
	if (!parse_options((char *)data, sbi)) {
		pr_err("unable to parse mount options\n");
		goto bail;
	}

	sb->s_op = &hfs_super_operations;
	sb->s_xattr = hfs_xattr_handlers;
	sb->s_flags |= MS_NODIRATIME;
	mutex_init(&sbi->bitmap_lock);

	res = hfs_mdb_get(sb);
	if (res) {
		if (!silent)
			pr_warn("can't find a HFS filesystem on dev %s\n",
				hfs_mdb_name(sb));
		res = -EINVAL;
		goto bail;
	}

	/* try to get the root inode */
	res = hfs_find_init(HFS_SB(sb)->cat_tree, &fd);
	if (res)
		goto bail_no_root;
	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:
	pr_err("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,
};
MODULE_ALIAS_FS("hfs");

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|SLAB_ACCOUNT, 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);

	/*
	 * Make sure all delayed rcu free inodes are flushed before we
	 * destroy cache.
	 */
	rcu_barrier();
	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>
66114cad	17	#include <linux/backing-dev.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>
5a0e3ad6	23	#include <linux/slab.h>
1da177e4 LT	24	#include <linux/vfs.h>
	25
	26	#include "hfs_fs.h"
	27	#include "btree.h"
	28
e18b890b	29	static struct kmem_cache *hfs_inode_cachep;
1da177e4 LT	30
	31	MODULE_LICENSE("GPL");
	32
58bc5bbb CH	33	static int hfs_sync_fs(struct super_block *sb, int wait)
58bc5bbb CH	34	{
58bc5bbb	35	hfs_mdb_commit(sb);
58bc5bbb CH	36	return 0;
	37	}
	38
1da177e4 LT	39	/*
	40	* hfs_put_super()
	41	*
	42	* This is the put_super() entry in the super_operations structure for
	43	* HFS filesystems. The purpose is to release the resources
	44	* associated with the superblock sb.
	45	*/
	46	static void hfs_put_super(struct super_block *sb)
	47	{
5687b578	48	cancel_delayed_work_sync(&HFS_SB(sb)->mdb_work);
1da177e4 LT	49	hfs_mdb_close(sb);
	50	/* release the MDB's resources */
	51	hfs_mdb_put(sb);
	52	}
	53
5687b578 AB	54	static void flush_mdb(struct work_struct *work)
	55	{
	56	struct hfs_sb_info *sbi;
	57	struct super_block *sb;
	58
	59	sbi = container_of(work, struct hfs_sb_info, mdb_work.work);
	60	sb = sbi->sb;
	61
	62	spin_lock(&sbi->work_lock);
	63	sbi->work_queued = 0;
	64	spin_unlock(&sbi->work_lock);
	65
	66	hfs_mdb_commit(sb);
	67	}
	68
	69	void hfs_mark_mdb_dirty(struct super_block *sb)
	70	{
	71	struct hfs_sb_info *sbi = HFS_SB(sb);
	72	unsigned long delay;
	73
	74	if (sb->s_flags & MS_RDONLY)
	75	return;
	76
	77	spin_lock(&sbi->work_lock);
	78	if (!sbi->work_queued) {
	79	delay = msecs_to_jiffies(dirty_writeback_interval * 10);
	80	queue_delayed_work(system_long_wq, &sbi->mdb_work, delay);
	81	sbi->work_queued = 1;
	82	}
	83	spin_unlock(&sbi->work_lock);
	84	}
	85
1da177e4 LT	86	/*
	87	* hfs_statfs()
	88	*
	89	* This is the statfs() entry in the super_operations structure for
	90	* HFS filesystems. The purpose is to return various data about the
	91	* filesystem.
	92	*
	93	* changed f_files/f_ffree to reflect the fs_ablock/free_ablocks.
	94	*/
726c3342	95	static int hfs_statfs(struct dentry dentry, struct kstatfs buf)
1da177e4	96	{
726c3342	97	struct super_block *sb = dentry->d_sb;
7dd2c000	98	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
726c3342	99
1da177e4 LT	100	buf->f_type = HFS_SUPER_MAGIC;
	101	buf->f_bsize = sb->s_blocksize;
	102	buf->f_blocks = (u32)HFS_SB(sb)->fs_ablocks * HFS_SB(sb)->fs_div;
	103	buf->f_bfree = (u32)HFS_SB(sb)->free_ablocks * HFS_SB(sb)->fs_div;
	104	buf->f_bavail = buf->f_bfree;
	105	buf->f_files = HFS_SB(sb)->fs_ablocks;
	106	buf->f_ffree = HFS_SB(sb)->free_ablocks;
7dd2c000 CL	107	buf->f_fsid.val[0] = (u32)id;
7dd2c000 CL	108	buf->f_fsid.val[1] = (u32)(id >> 32);
1da177e4 LT	109	buf->f_namelen = HFS_NAMELEN;
	110
	111	return 0;
	112	}
	113
	114	static int hfs_remount(struct super_block sb, int flags, char *data)
	115	{
02b9984d	116	sync_filesystem(sb);
1da177e4 LT	117	*flags \|= MS_NODIRATIME;
	118	if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
	119	return 0;
	120	if (!(*flags & MS_RDONLY)) {
	121	if (!(HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_UNMNT))) {
d6142673	122	pr_warn("filesystem was not cleanly unmounted, running fsck.hfs is recommended. leaving read-only.\n");
1da177e4 LT	123	sb->s_flags \|= MS_RDONLY;
	124	*flags \|= MS_RDONLY;
	125	} else if (HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_SLOCK)) {
d6142673	126	pr_warn("filesystem is marked locked, leaving read-only.\n");
1da177e4 LT	127	sb->s_flags \|= MS_RDONLY;
	128	*flags \|= MS_RDONLY;
	129	}
	130	}
	131	return 0;
	132	}
	133
34c80b1d	134	static int hfs_show_options(struct seq_file seq, struct dentry root)
717dd80e	135	{
34c80b1d	136	struct hfs_sb_info *sbi = HFS_SB(root->d_sb);
717dd80e RZ	137
717dd80e RZ	138	if (sbi->s_creator != cpu_to_be32(0x3f3f3f3f))
a068acf2	139	seq_show_option_n(seq, "creator", (char *)&sbi->s_creator, 4);
717dd80e	140	if (sbi->s_type != cpu_to_be32(0x3f3f3f3f))
a068acf2	141	seq_show_option_n(seq, "type", (char *)&sbi->s_type, 4);
43b5e4cc EB	142	seq_printf(seq, ",uid=%u,gid=%u",
	143	from_kuid_munged(&init_user_ns, sbi->s_uid),
	144	from_kgid_munged(&init_user_ns, sbi->s_gid));
717dd80e RZ	145	if (sbi->s_file_umask != 0133)
	146	seq_printf(seq, ",file_umask=%o", sbi->s_file_umask);
	147	if (sbi->s_dir_umask != 0022)
	148	seq_printf(seq, ",dir_umask=%o", sbi->s_dir_umask);
	149	if (sbi->part >= 0)
	150	seq_printf(seq, ",part=%u", sbi->part);
	151	if (sbi->session >= 0)
	152	seq_printf(seq, ",session=%u", sbi->session);
328b9227 RZ	153	if (sbi->nls_disk)
	154	seq_printf(seq, ",codepage=%s", sbi->nls_disk->charset);
	155	if (sbi->nls_io)
	156	seq_printf(seq, ",iocharset=%s", sbi->nls_io->charset);
717dd80e RZ	157	if (sbi->s_quiet)
	158	seq_printf(seq, ",quiet");
	159	return 0;
	160	}
	161
1da177e4 LT	162	static struct inode hfs_alloc_inode(struct super_block sb)
	163	{
	164	struct hfs_inode_info *i;
	165
e94b1766	166	i = kmem_cache_alloc(hfs_inode_cachep, GFP_KERNEL);
1da177e4 LT	167	return i ? &i->vfs_inode : NULL;
	168	}
	169
fa0d7e3d	170	static void hfs_i_callback(struct rcu_head *head)
1da177e4	171	{
fa0d7e3d	172	struct inode *inode = container_of(head, struct inode, i_rcu);
1da177e4 LT	173	kmem_cache_free(hfs_inode_cachep, HFS_I(inode));
	174	}
	175
fa0d7e3d NP	176	static void hfs_destroy_inode(struct inode *inode)
	177	{
	178	call_rcu(&inode->i_rcu, hfs_i_callback);
	179	}
	180
ee9b6d61	181	static const struct super_operations hfs_super_operations = {
1da177e4 LT	182	.alloc_inode = hfs_alloc_inode,
	183	.destroy_inode = hfs_destroy_inode,
	184	.write_inode = hfs_write_inode,
b57922d9	185	.evict_inode = hfs_evict_inode,
1da177e4	186	.put_super = hfs_put_super,
58bc5bbb	187	.sync_fs = hfs_sync_fs,
1da177e4 LT	188	.statfs = hfs_statfs,
1da177e4 LT	189	.remount_fs = hfs_remount,
717dd80e	190	.show_options = hfs_show_options,
1da177e4 LT	191	};
	192
	193	enum {
	194	opt_uid, opt_gid, opt_umask, opt_file_umask, opt_dir_umask,
	195	opt_part, opt_session, opt_type, opt_creator, opt_quiet,
328b9227	196	opt_codepage, opt_iocharset,
1da177e4 LT	197	opt_err
	198	};
	199
a447c093	200	static const match_table_t tokens = {
1da177e4 LT	201	{ opt_uid, "uid=%u" },
	202	{ opt_gid, "gid=%u" },
	203	{ opt_umask, "umask=%o" },
	204	{ opt_file_umask, "file_umask=%o" },
	205	{ opt_dir_umask, "dir_umask=%o" },
	206	{ opt_part, "part=%u" },
	207	{ opt_session, "session=%u" },
	208	{ opt_type, "type=%s" },
	209	{ opt_creator, "creator=%s" },
	210	{ opt_quiet, "quiet" },
328b9227 RZ	211	{ opt_codepage, "codepage=%s" },
328b9227 RZ	212	{ opt_iocharset, "iocharset=%s" },
1da177e4 LT	213	{ opt_err, NULL }
	214	};
	215
	216	static inline int match_fourchar(substring_t arg, u32 result)
	217	{
	218	if (arg->to - arg->from != 4)
	219	return -EINVAL;
	220	memcpy(result, arg->from, 4);
	221	return 0;
	222	}
	223
	224	/*
	225	* parse_options()
	226	*
	227	* adapted from linux/fs/msdos/inode.c written 1992,93 by Werner Almesberger
	228	* This function is called by hfs_read_super() to parse the mount options.
	229	*/
	230	static int parse_options(char options, struct hfs_sb_info hsb)
	231	{
	232	char *p;
	233	substring_t args[MAX_OPT_ARGS];
	234	int tmp, token;
	235
	236	/* initialize the sb with defaults */
94c9a5ee DH	237	hsb->s_uid = current_uid();
94c9a5ee DH	238	hsb->s_gid = current_gid();
1da177e4 LT	239	hsb->s_file_umask = 0133;
	240	hsb->s_dir_umask = 0022;
	241	hsb->s_type = hsb->s_creator = cpu_to_be32(0x3f3f3f3f); /* == '????' */
	242	hsb->s_quiet = 0;
	243	hsb->part = -1;
	244	hsb->session = -1;
	245
	246	if (!options)
	247	return 1;
	248
	249	while ((p = strsep(&options, ",")) != NULL) {
	250	if (!*p)
	251	continue;
	252
	253	token = match_token(p, tokens, args);
	254	switch (token) {
	255	case opt_uid:
	256	if (match_int(&args[0], &tmp)) {
d6142673	257	pr_err("uid requires an argument\n");
1da177e4 LT	258	return 0;
1da177e4 LT	259	}
43b5e4cc EB	260	hsb->s_uid = make_kuid(current_user_ns(), (uid_t)tmp);
43b5e4cc EB	261	if (!uid_valid(hsb->s_uid)) {
d6142673	262	pr_err("invalid uid %d\n", tmp);
43b5e4cc EB	263	return 0;
43b5e4cc EB	264	}
1da177e4 LT	265	break;
	266	case opt_gid:
	267	if (match_int(&args[0], &tmp)) {
d6142673	268	pr_err("gid requires an argument\n");
1da177e4 LT	269	return 0;
1da177e4 LT	270	}
43b5e4cc EB	271	hsb->s_gid = make_kgid(current_user_ns(), (gid_t)tmp);
43b5e4cc EB	272	if (!gid_valid(hsb->s_gid)) {
d6142673	273	pr_err("invalid gid %d\n", tmp);
43b5e4cc EB	274	return 0;
43b5e4cc EB	275	}
1da177e4 LT	276	break;
	277	case opt_umask:
	278	if (match_octal(&args[0], &tmp)) {
d6142673	279	pr_err("umask requires a value\n");
1da177e4 LT	280	return 0;
	281	}
	282	hsb->s_file_umask = (umode_t)tmp;
	283	hsb->s_dir_umask = (umode_t)tmp;
	284	break;
	285	case opt_file_umask:
	286	if (match_octal(&args[0], &tmp)) {
d6142673	287	pr_err("file_umask requires a value\n");
1da177e4 LT	288	return 0;
	289	}
	290	hsb->s_file_umask = (umode_t)tmp;
	291	break;
	292	case opt_dir_umask:
	293	if (match_octal(&args[0], &tmp)) {
d6142673	294	pr_err("dir_umask requires a value\n");
1da177e4 LT	295	return 0;
	296	}
	297	hsb->s_dir_umask = (umode_t)tmp;
	298	break;
	299	case opt_part:
	300	if (match_int(&args[0], &hsb->part)) {
d6142673	301	pr_err("part requires an argument\n");
1da177e4 LT	302	return 0;
	303	}
	304	break;
	305	case opt_session:
	306	if (match_int(&args[0], &hsb->session)) {
d6142673	307	pr_err("session requires an argument\n");
1da177e4 LT	308	return 0;
	309	}
	310	break;
	311	case opt_type:
	312	if (match_fourchar(&args[0], &hsb->s_type)) {
d6142673	313	pr_err("type requires a 4 character value\n");
1da177e4 LT	314	return 0;
	315	}
	316	break;
	317	case opt_creator:
	318	if (match_fourchar(&args[0], &hsb->s_creator)) {
d6142673	319	pr_err("creator requires a 4 character value\n");
1da177e4 LT	320	return 0;
	321	}
	322	break;
	323	case opt_quiet:
	324	hsb->s_quiet = 1;
	325	break;
328b9227 RZ	326	case opt_codepage:
328b9227 RZ	327	if (hsb->nls_disk) {
d6142673	328	pr_err("unable to change codepage\n");
328b9227 RZ	329	return 0;
	330	}
	331	p = match_strdup(&args[0]);
3fbe5c31 JM	332	if (p)
3fbe5c31 JM	333	hsb->nls_disk = load_nls(p);
328b9227	334	if (!hsb->nls_disk) {
d6142673	335	pr_err("unable to load codepage \"%s\"\n", p);
328b9227 RZ	336	kfree(p);
	337	return 0;
	338	}
	339	kfree(p);
	340	break;
	341	case opt_iocharset:
	342	if (hsb->nls_io) {
d6142673	343	pr_err("unable to change iocharset\n");
328b9227 RZ	344	return 0;
	345	}
	346	p = match_strdup(&args[0]);
3fbe5c31 JM	347	if (p)
3fbe5c31 JM	348	hsb->nls_io = load_nls(p);
328b9227	349	if (!hsb->nls_io) {
d6142673	350	pr_err("unable to load iocharset \"%s\"\n", p);
328b9227 RZ	351	kfree(p);
	352	return 0;
	353	}
	354	kfree(p);
	355	break;
1da177e4 LT	356	default:
	357	return 0;
	358	}
	359	}
	360
328b9227 RZ	361	if (hsb->nls_disk && !hsb->nls_io) {
	362	hsb->nls_io = load_nls_default();
	363	if (!hsb->nls_io) {
d6142673	364	pr_err("unable to load default iocharset\n");
328b9227 RZ	365	return 0;
	366	}
	367	}
1da177e4 LT	368	hsb->s_dir_umask &= 0777;
	369	hsb->s_file_umask &= 0577;
	370
	371	return 1;
	372	}
	373
	374	/*
	375	* hfs_read_super()
	376	*
	377	* This is the function that is responsible for mounting an HFS
	378	* filesystem. It performs all the tasks necessary to get enough data
	379	* from the disk to read the root inode. This includes parsing the
	380	* mount options, dealing with Macintosh partitions, reading the
	381	* superblock and the allocation bitmap blocks, calling
	382	* hfs_btree_init() to get the necessary data about the extents and
	383	* catalog B-trees and, finally, reading the root inode into memory.
	384	*/
	385	static int hfs_fill_super(struct super_block sb, void data, int silent)
	386	{
	387	struct hfs_sb_info *sbi;
	388	struct hfs_find_data fd;
	389	hfs_cat_rec rec;
	390	struct inode *root_inode;
	391	int res;
	392
f8314dc6	393	sbi = kzalloc(sizeof(struct hfs_sb_info), GFP_KERNEL);
8526fb37	394	if (!sbi)
1da177e4	395	return -ENOMEM;
8526fb37	396
b16ca626	397	sbi->sb = sb;
1da177e4	398	sb->s_fs_info = sbi;
5687b578 AB	399	spin_lock_init(&sbi->work_lock);
5687b578 AB	400	INIT_DELAYED_WORK(&sbi->mdb_work, flush_mdb);
1da177e4 LT	401
	402	res = -EINVAL;
	403	if (!parse_options((char *)data, sbi)) {
d6142673	404	pr_err("unable to parse mount options\n");
945b0920	405	goto bail;
1da177e4 LT	406	}
	407
	408	sb->s_op = &hfs_super_operations;
b8020eff	409	sb->s_xattr = hfs_xattr_handlers;
1da177e4	410	sb->s_flags \|= MS_NODIRATIME;
3084b72d	411	mutex_init(&sbi->bitmap_lock);
1da177e4 LT	412
	413	res = hfs_mdb_get(sb);
	414	if (res) {
	415	if (!silent)
d6142673	416	pr_warn("can't find a HFS filesystem on dev %s\n",
1da177e4 LT	417	hfs_mdb_name(sb));
1da177e4 LT	418	res = -EINVAL;
945b0920	419	goto bail;
1da177e4 LT	420	}
	421
	422	/* try to get the root inode */
9509f178 AK	423	res = hfs_find_init(HFS_SB(sb)->cat_tree, &fd);
	424	if (res)
	425	goto bail_no_root;
1da177e4	426	res = hfs_cat_find_brec(sb, HFS_ROOT_CNID, &fd);
ec81aecb AW	427	if (!res) {
	428	if (fd.entrylength > sizeof(rec) \|\| fd.entrylength < 0) {
	429	res = -EIO;
	430	goto bail;
	431	}
1da177e4	432	hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, fd.entrylength);
ec81aecb	433	}
1da177e4 LT	434	if (res) {
	435	hfs_find_exit(&fd);
	436	goto bail_no_root;
	437	}
d6ddf554	438	res = -EINVAL;
1da177e4 LT	439	root_inode = hfs_iget(sb, &fd.search_key->cat, &rec);
	440	hfs_find_exit(&fd);
	441	if (!root_inode)
	442	goto bail_no_root;
	443
518c79d2	444	sb->s_d_op = &hfs_dentry_operations;
d6ddf554	445	res = -ENOMEM;
48fde701	446	sb->s_root = d_make_root(root_inode);
1da177e4	447	if (!sb->s_root)
48fde701	448	goto bail_no_root;
1da177e4	449
1da177e4 LT	450	/* everything's okay */
	451	return 0;
	452
1da177e4	453	bail_no_root:
d6142673	454	pr_err("get root inode failed\n");
945b0920	455	bail:
1da177e4	456	hfs_mdb_put(sb);
1da177e4 LT	457	return res;
	458	}
	459
152a0836 AV	460	static struct dentry hfs_mount(struct file_system_type fs_type,
152a0836 AV	461	int flags, const char dev_name, void data)
1da177e4	462	{
152a0836	463	return mount_bdev(fs_type, flags, dev_name, data, hfs_fill_super);
1da177e4 LT	464	}
	465
	466	static struct file_system_type hfs_fs_type = {
	467	.owner = THIS_MODULE,
	468	.name = "hfs",
152a0836	469	.mount = hfs_mount,
1da177e4 LT	470	.kill_sb = kill_block_super,
	471	.fs_flags = FS_REQUIRES_DEV,
	472	};
7f78e035	473	MODULE_ALIAS_FS("hfs");
1da177e4	474
51cc5068	475	static void hfs_init_once(void *p)
1da177e4 LT	476	{
	477	struct hfs_inode_info *i = p;
	478
a35afb83	479	inode_init_once(&i->vfs_inode);
1da177e4 LT	480	}
	481
	482	static int __init init_hfs_fs(void)
	483	{
	484	int err;
	485
	486	hfs_inode_cachep = kmem_cache_create("hfs_inode_cache",
5d097056 VD	487	sizeof(struct hfs_inode_info), 0,
5d097056 VD	488	SLAB_HWCACHE_ALIGN\|SLAB_ACCOUNT, hfs_init_once);
1da177e4 LT	489	if (!hfs_inode_cachep)
	490	return -ENOMEM;
	491	err = register_filesystem(&hfs_fs_type);
	492	if (err)
	493	kmem_cache_destroy(hfs_inode_cachep);
	494	return err;
	495	}
	496
	497	static void __exit exit_hfs_fs(void)
	498	{
	499	unregister_filesystem(&hfs_fs_type);
8c0a8537 KS	500
	501	/*
	502	* Make sure all delayed rcu free inodes are flushed before we
	503	* destroy cache.
	504	*/
	505	rcu_barrier();
1a1d92c1	506	kmem_cache_destroy(hfs_inode_cachep);
1da177e4 LT	507	}
	508
	509	module_init(init_hfs_fs)
	510	module_exit(exit_hfs_fs)