[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_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");

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)
{
	*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_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",
			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_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,
		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>
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
58bc5bbb CH	32	static int hfs_sync_fs(struct super_block *sb, int wait)
58bc5bbb CH	33	{
58bc5bbb	34	hfs_mdb_commit(sb);
58bc5bbb CH	35	return 0;
	36	}
	37
1da177e4 LT	38	/*
	39	* hfs_put_super()
	40	*
	41	* This is the put_super() entry in the super_operations structure for
	42	* HFS filesystems. The purpose is to release the resources
	43	* associated with the superblock sb.
	44	*/
	45	static void hfs_put_super(struct super_block *sb)
	46	{
5687b578	47	cancel_delayed_work_sync(&HFS_SB(sb)->mdb_work);
1da177e4 LT	48	hfs_mdb_close(sb);
	49	/* release the MDB's resources */
	50	hfs_mdb_put(sb);
	51	}
	52
5687b578 AB	53	static void flush_mdb(struct work_struct *work)
	54	{
	55	struct hfs_sb_info *sbi;
	56	struct super_block *sb;
	57
	58	sbi = container_of(work, struct hfs_sb_info, mdb_work.work);
	59	sb = sbi->sb;
	60
	61	spin_lock(&sbi->work_lock);
	62	sbi->work_queued = 0;
	63	spin_unlock(&sbi->work_lock);
	64
	65	hfs_mdb_commit(sb);
	66	}
	67
	68	void hfs_mark_mdb_dirty(struct super_block *sb)
	69	{
	70	struct hfs_sb_info *sbi = HFS_SB(sb);
	71	unsigned long delay;
	72
	73	if (sb->s_flags & MS_RDONLY)
	74	return;
	75
	76	spin_lock(&sbi->work_lock);
	77	if (!sbi->work_queued) {
	78	delay = msecs_to_jiffies(dirty_writeback_interval * 10);
	79	queue_delayed_work(system_long_wq, &sbi->mdb_work, delay);
	80	sbi->work_queued = 1;
	81	}
	82	spin_unlock(&sbi->work_lock);
	83	}
	84
1da177e4 LT	85	/*
	86	* hfs_statfs()
	87	*
	88	* This is the statfs() entry in the super_operations structure for
	89	* HFS filesystems. The purpose is to return various data about the
	90	* filesystem.
	91	*
	92	* changed f_files/f_ffree to reflect the fs_ablock/free_ablocks.
	93	*/
726c3342	94	static int hfs_statfs(struct dentry dentry, struct kstatfs buf)
1da177e4	95	{
726c3342	96	struct super_block *sb = dentry->d_sb;
7dd2c000	97	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
726c3342	98
1da177e4 LT	99	buf->f_type = HFS_SUPER_MAGIC;
	100	buf->f_bsize = sb->s_blocksize;
	101	buf->f_blocks = (u32)HFS_SB(sb)->fs_ablocks * HFS_SB(sb)->fs_div;
	102	buf->f_bfree = (u32)HFS_SB(sb)->free_ablocks * HFS_SB(sb)->fs_div;
	103	buf->f_bavail = buf->f_bfree;
	104	buf->f_files = HFS_SB(sb)->fs_ablocks;
	105	buf->f_ffree = HFS_SB(sb)->free_ablocks;
7dd2c000 CL	106	buf->f_fsid.val[0] = (u32)id;
7dd2c000 CL	107	buf->f_fsid.val[1] = (u32)(id >> 32);
1da177e4 LT	108	buf->f_namelen = HFS_NAMELEN;
	109
	110	return 0;
	111	}
	112
	113	static int hfs_remount(struct super_block sb, int flags, char *data)
	114	{
	115	*flags \|= MS_NODIRATIME;
	116	if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
	117	return 0;
	118	if (!(*flags & MS_RDONLY)) {
	119	if (!(HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_UNMNT))) {
d6142673	120	pr_warn("filesystem was not cleanly unmounted, running fsck.hfs is recommended. leaving read-only.\n");
1da177e4 LT	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)) {
d6142673	124	pr_warn("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);
43b5e4cc EB	140	seq_printf(seq, ",uid=%u,gid=%u",
	141	from_kuid_munged(&init_user_ns, sbi->s_uid),
	142	from_kgid_munged(&init_user_ns, sbi->s_gid));
717dd80e RZ	143	if (sbi->s_file_umask != 0133)
	144	seq_printf(seq, ",file_umask=%o", sbi->s_file_umask);
	145	if (sbi->s_dir_umask != 0022)
	146	seq_printf(seq, ",dir_umask=%o", sbi->s_dir_umask);
	147	if (sbi->part >= 0)
	148	seq_printf(seq, ",part=%u", sbi->part);
	149	if (sbi->session >= 0)
	150	seq_printf(seq, ",session=%u", sbi->session);
328b9227 RZ	151	if (sbi->nls_disk)
	152	seq_printf(seq, ",codepage=%s", sbi->nls_disk->charset);
	153	if (sbi->nls_io)
	154	seq_printf(seq, ",iocharset=%s", sbi->nls_io->charset);
717dd80e RZ	155	if (sbi->s_quiet)
	156	seq_printf(seq, ",quiet");
	157	return 0;
	158	}
	159
1da177e4 LT	160	static struct inode hfs_alloc_inode(struct super_block sb)
	161	{
	162	struct hfs_inode_info *i;
	163
e94b1766	164	i = kmem_cache_alloc(hfs_inode_cachep, GFP_KERNEL);
1da177e4 LT	165	return i ? &i->vfs_inode : NULL;
	166	}
	167
fa0d7e3d	168	static void hfs_i_callback(struct rcu_head *head)
1da177e4	169	{
fa0d7e3d	170	struct inode *inode = container_of(head, struct inode, i_rcu);
1da177e4 LT	171	kmem_cache_free(hfs_inode_cachep, HFS_I(inode));
	172	}
	173
fa0d7e3d NP	174	static void hfs_destroy_inode(struct inode *inode)
	175	{
	176	call_rcu(&inode->i_rcu, hfs_i_callback);
	177	}
	178
ee9b6d61	179	static const struct super_operations hfs_super_operations = {
1da177e4 LT	180	.alloc_inode = hfs_alloc_inode,
	181	.destroy_inode = hfs_destroy_inode,
	182	.write_inode = hfs_write_inode,
b57922d9	183	.evict_inode = hfs_evict_inode,
1da177e4	184	.put_super = hfs_put_super,
58bc5bbb	185	.sync_fs = hfs_sync_fs,
1da177e4 LT	186	.statfs = hfs_statfs,
1da177e4 LT	187	.remount_fs = hfs_remount,
717dd80e	188	.show_options = hfs_show_options,
1da177e4 LT	189	};
	190
	191	enum {
	192	opt_uid, opt_gid, opt_umask, opt_file_umask, opt_dir_umask,
	193	opt_part, opt_session, opt_type, opt_creator, opt_quiet,
328b9227	194	opt_codepage, opt_iocharset,
1da177e4 LT	195	opt_err
	196	};
	197
a447c093	198	static const match_table_t tokens = {
1da177e4 LT	199	{ opt_uid, "uid=%u" },
	200	{ opt_gid, "gid=%u" },
	201	{ opt_umask, "umask=%o" },
	202	{ opt_file_umask, "file_umask=%o" },
	203	{ opt_dir_umask, "dir_umask=%o" },
	204	{ opt_part, "part=%u" },
	205	{ opt_session, "session=%u" },
	206	{ opt_type, "type=%s" },
	207	{ opt_creator, "creator=%s" },
	208	{ opt_quiet, "quiet" },
328b9227 RZ	209	{ opt_codepage, "codepage=%s" },
328b9227 RZ	210	{ opt_iocharset, "iocharset=%s" },
1da177e4 LT	211	{ opt_err, NULL }
	212	};
	213
	214	static inline int match_fourchar(substring_t arg, u32 result)
	215	{
	216	if (arg->to - arg->from != 4)
	217	return -EINVAL;
	218	memcpy(result, arg->from, 4);
	219	return 0;
	220	}
	221
	222	/*
	223	* parse_options()
	224	*
	225	* adapted from linux/fs/msdos/inode.c written 1992,93 by Werner Almesberger
	226	* This function is called by hfs_read_super() to parse the mount options.
	227	*/
	228	static int parse_options(char options, struct hfs_sb_info hsb)
	229	{
	230	char *p;
	231	substring_t args[MAX_OPT_ARGS];
	232	int tmp, token;
	233
	234	/* initialize the sb with defaults */
94c9a5ee DH	235	hsb->s_uid = current_uid();
94c9a5ee DH	236	hsb->s_gid = current_gid();
1da177e4 LT	237	hsb->s_file_umask = 0133;
	238	hsb->s_dir_umask = 0022;
	239	hsb->s_type = hsb->s_creator = cpu_to_be32(0x3f3f3f3f); /* == '????' */
	240	hsb->s_quiet = 0;
	241	hsb->part = -1;
	242	hsb->session = -1;
	243
	244	if (!options)
	245	return 1;
	246
	247	while ((p = strsep(&options, ",")) != NULL) {
	248	if (!*p)
	249	continue;
	250
	251	token = match_token(p, tokens, args);
	252	switch (token) {
	253	case opt_uid:
	254	if (match_int(&args[0], &tmp)) {
d6142673	255	pr_err("uid requires an argument\n");
1da177e4 LT	256	return 0;
1da177e4 LT	257	}
43b5e4cc EB	258	hsb->s_uid = make_kuid(current_user_ns(), (uid_t)tmp);
43b5e4cc EB	259	if (!uid_valid(hsb->s_uid)) {
d6142673	260	pr_err("invalid uid %d\n", tmp);
43b5e4cc EB	261	return 0;
43b5e4cc EB	262	}
1da177e4 LT	263	break;
	264	case opt_gid:
	265	if (match_int(&args[0], &tmp)) {
d6142673	266	pr_err("gid requires an argument\n");
1da177e4 LT	267	return 0;
1da177e4 LT	268	}
43b5e4cc EB	269	hsb->s_gid = make_kgid(current_user_ns(), (gid_t)tmp);
43b5e4cc EB	270	if (!gid_valid(hsb->s_gid)) {
d6142673	271	pr_err("invalid gid %d\n", tmp);
43b5e4cc EB	272	return 0;
43b5e4cc EB	273	}
1da177e4 LT	274	break;
	275	case opt_umask:
	276	if (match_octal(&args[0], &tmp)) {
d6142673	277	pr_err("umask requires a value\n");
1da177e4 LT	278	return 0;
	279	}
	280	hsb->s_file_umask = (umode_t)tmp;
	281	hsb->s_dir_umask = (umode_t)tmp;
	282	break;
	283	case opt_file_umask:
	284	if (match_octal(&args[0], &tmp)) {
d6142673	285	pr_err("file_umask requires a value\n");
1da177e4 LT	286	return 0;
	287	}
	288	hsb->s_file_umask = (umode_t)tmp;
	289	break;
	290	case opt_dir_umask:
	291	if (match_octal(&args[0], &tmp)) {
d6142673	292	pr_err("dir_umask requires a value\n");
1da177e4 LT	293	return 0;
	294	}
	295	hsb->s_dir_umask = (umode_t)tmp;
	296	break;
	297	case opt_part:
	298	if (match_int(&args[0], &hsb->part)) {
d6142673	299	pr_err("part requires an argument\n");
1da177e4 LT	300	return 0;
	301	}
	302	break;
	303	case opt_session:
	304	if (match_int(&args[0], &hsb->session)) {
d6142673	305	pr_err("session requires an argument\n");
1da177e4 LT	306	return 0;
	307	}
	308	break;
	309	case opt_type:
	310	if (match_fourchar(&args[0], &hsb->s_type)) {
d6142673	311	pr_err("type requires a 4 character value\n");
1da177e4 LT	312	return 0;
	313	}
	314	break;
	315	case opt_creator:
	316	if (match_fourchar(&args[0], &hsb->s_creator)) {
d6142673	317	pr_err("creator requires a 4 character value\n");
1da177e4 LT	318	return 0;
	319	}
	320	break;
	321	case opt_quiet:
	322	hsb->s_quiet = 1;
	323	break;
328b9227 RZ	324	case opt_codepage:
328b9227 RZ	325	if (hsb->nls_disk) {
d6142673	326	pr_err("unable to change codepage\n");
328b9227 RZ	327	return 0;
	328	}
	329	p = match_strdup(&args[0]);
3fbe5c31 JM	330	if (p)
3fbe5c31 JM	331	hsb->nls_disk = load_nls(p);
328b9227	332	if (!hsb->nls_disk) {
d6142673	333	pr_err("unable to load codepage \"%s\"\n", p);
328b9227 RZ	334	kfree(p);
	335	return 0;
	336	}
	337	kfree(p);
	338	break;
	339	case opt_iocharset:
	340	if (hsb->nls_io) {
d6142673	341	pr_err("unable to change iocharset\n");
328b9227 RZ	342	return 0;
	343	}
	344	p = match_strdup(&args[0]);
3fbe5c31 JM	345	if (p)
3fbe5c31 JM	346	hsb->nls_io = load_nls(p);
328b9227	347	if (!hsb->nls_io) {
d6142673	348	pr_err("unable to load iocharset \"%s\"\n", p);
328b9227 RZ	349	kfree(p);
	350	return 0;
	351	}
	352	kfree(p);
	353	break;
1da177e4 LT	354	default:
	355	return 0;
	356	}
	357	}
	358
328b9227 RZ	359	if (hsb->nls_disk && !hsb->nls_io) {
	360	hsb->nls_io = load_nls_default();
	361	if (!hsb->nls_io) {
d6142673	362	pr_err("unable to load default iocharset\n");
328b9227 RZ	363	return 0;
	364	}
	365	}
1da177e4 LT	366	hsb->s_dir_umask &= 0777;
	367	hsb->s_file_umask &= 0577;
	368
	369	return 1;
	370	}
	371
	372	/*
	373	* hfs_read_super()
	374	*
	375	* This is the function that is responsible for mounting an HFS
	376	* filesystem. It performs all the tasks necessary to get enough data
	377	* from the disk to read the root inode. This includes parsing the
	378	* mount options, dealing with Macintosh partitions, reading the
	379	* superblock and the allocation bitmap blocks, calling
	380	* hfs_btree_init() to get the necessary data about the extents and
	381	* catalog B-trees and, finally, reading the root inode into memory.
	382	*/
	383	static int hfs_fill_super(struct super_block sb, void data, int silent)
	384	{
	385	struct hfs_sb_info *sbi;
	386	struct hfs_find_data fd;
	387	hfs_cat_rec rec;
	388	struct inode *root_inode;
	389	int res;
	390
f8314dc6	391	sbi = kzalloc(sizeof(struct hfs_sb_info), GFP_KERNEL);
8526fb37	392	if (!sbi)
1da177e4	393	return -ENOMEM;
8526fb37	394
b16ca626	395	sbi->sb = sb;
1da177e4	396	sb->s_fs_info = sbi;
5687b578 AB	397	spin_lock_init(&sbi->work_lock);
5687b578 AB	398	INIT_DELAYED_WORK(&sbi->mdb_work, flush_mdb);
1da177e4 LT	399
	400	res = -EINVAL;
	401	if (!parse_options((char *)data, sbi)) {
d6142673	402	pr_err("unable to parse mount options\n");
945b0920	403	goto bail;
1da177e4 LT	404	}
	405
	406	sb->s_op = &hfs_super_operations;
	407	sb->s_flags \|= MS_NODIRATIME;
3084b72d	408	mutex_init(&sbi->bitmap_lock);
1da177e4 LT	409
	410	res = hfs_mdb_get(sb);
	411	if (res) {
	412	if (!silent)
d6142673	413	pr_warn("can't find a HFS filesystem on dev %s\n",
1da177e4 LT	414	hfs_mdb_name(sb));
1da177e4 LT	415	res = -EINVAL;
945b0920	416	goto bail;
1da177e4 LT	417	}
	418
	419	/* try to get the root inode */
9509f178 AK	420	res = hfs_find_init(HFS_SB(sb)->cat_tree, &fd);
	421	if (res)
	422	goto bail_no_root;
1da177e4	423	res = hfs_cat_find_brec(sb, HFS_ROOT_CNID, &fd);
ec81aecb AW	424	if (!res) {
	425	if (fd.entrylength > sizeof(rec) \|\| fd.entrylength < 0) {
	426	res = -EIO;
	427	goto bail;
	428	}
1da177e4	429	hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, fd.entrylength);
ec81aecb	430	}
1da177e4 LT	431	if (res) {
	432	hfs_find_exit(&fd);
	433	goto bail_no_root;
	434	}
d6ddf554	435	res = -EINVAL;
1da177e4 LT	436	root_inode = hfs_iget(sb, &fd.search_key->cat, &rec);
	437	hfs_find_exit(&fd);
	438	if (!root_inode)
	439	goto bail_no_root;
	440
518c79d2	441	sb->s_d_op = &hfs_dentry_operations;
d6ddf554	442	res = -ENOMEM;
48fde701	443	sb->s_root = d_make_root(root_inode);
1da177e4	444	if (!sb->s_root)
48fde701	445	goto bail_no_root;
1da177e4	446
1da177e4 LT	447	/* everything's okay */
	448	return 0;
	449
1da177e4	450	bail_no_root:
d6142673	451	pr_err("get root inode failed\n");
945b0920	452	bail:
1da177e4	453	hfs_mdb_put(sb);
1da177e4 LT	454	return res;
	455	}
	456
152a0836 AV	457	static struct dentry hfs_mount(struct file_system_type fs_type,
152a0836 AV	458	int flags, const char dev_name, void data)
1da177e4	459	{
152a0836	460	return mount_bdev(fs_type, flags, dev_name, data, hfs_fill_super);
1da177e4 LT	461	}
	462
	463	static struct file_system_type hfs_fs_type = {
	464	.owner = THIS_MODULE,
	465	.name = "hfs",
152a0836	466	.mount = hfs_mount,
1da177e4 LT	467	.kill_sb = kill_block_super,
	468	.fs_flags = FS_REQUIRES_DEV,
	469	};
7f78e035	470	MODULE_ALIAS_FS("hfs");
1da177e4	471
51cc5068	472	static void hfs_init_once(void *p)
1da177e4 LT	473	{
	474	struct hfs_inode_info *i = p;
	475
a35afb83	476	inode_init_once(&i->vfs_inode);
1da177e4 LT	477	}
	478
	479	static int __init init_hfs_fs(void)
	480	{
	481	int err;
	482
	483	hfs_inode_cachep = kmem_cache_create("hfs_inode_cache",
	484	sizeof(struct hfs_inode_info), 0, SLAB_HWCACHE_ALIGN,
20c2df83	485	hfs_init_once);
1da177e4 LT	486	if (!hfs_inode_cachep)
	487	return -ENOMEM;
	488	err = register_filesystem(&hfs_fs_type);
	489	if (err)
	490	kmem_cache_destroy(hfs_inode_cachep);
	491	return err;
	492	}
	493
	494	static void __exit exit_hfs_fs(void)
	495	{
	496	unregister_filesystem(&hfs_fs_type);
8c0a8537 KS	497
	498	/*
	499	* Make sure all delayed rcu free inodes are flushed before we
	500	* destroy cache.
	501	*/
	502	rcu_barrier();
1a1d92c1	503	kmem_cache_destroy(hfs_inode_cachep);
1da177e4 LT	504	}
	505
	506	module_init(init_hfs_fs)
	507	module_exit(exit_hfs_fs)