[linux.git] / fs / hfs / super.c

/*
 *  linux/fs/hfs/super.c
 *
 * Copyright (C) 1995-1997  Paul H. Hargrove
 * (C) 2003 Ardis Technologies <roman@ardistech.com>
 * This file may be distributed under the terms of the GNU General Public License.
 *
 * This file contains hfs_read_super(), some of the super_ops and
 * init_hfs_fs() and exit_hfs_fs().  The remaining super_ops are in
 * inode.c since they deal with inodes.
 *
 * Based on the minix file system code, (C) 1991, 1992 by Linus Torvalds
 */

#include <linux/module.h>
#include <linux/blkdev.h>
#include <linux/backing-dev.h>
#include <linux/fs_context.h>
#include <linux/fs_parser.h>
#include <linux/mount.h>
#include <linux/init.h>
#include <linux/nls.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_DESCRIPTION("Apple Macintosh file system support");
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_rdonly(sb))
		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 = u64_to_fsid(id);
	buf->f_namelen = HFS_NAMELEN;

	return 0;
}

static int hfs_reconfigure(struct fs_context *fc)
{
	struct super_block *sb = fc->root->d_sb;

	sync_filesystem(sb);
	fc->sb_flags |= SB_NODIRATIME;
	if ((bool)(fc->sb_flags & SB_RDONLY) == sb_rdonly(sb))
		return 0;

	if (!(fc->sb_flags & SB_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 |= SB_RDONLY;
			fc->sb_flags |= SB_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 |= SB_RDONLY;
			fc->sb_flags |= SB_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 = alloc_inode_sb(sb, hfs_inode_cachep, GFP_KERNEL);
	return i ? &i->vfs_inode : NULL;
}

static void hfs_free_inode(struct inode *inode)
{
	kmem_cache_free(hfs_inode_cachep, HFS_I(inode));
}

static const struct super_operations hfs_super_operations = {
	.alloc_inode	= hfs_alloc_inode,
	.free_inode	= hfs_free_inode,
	.write_inode	= hfs_write_inode,
	.evict_inode	= hfs_evict_inode,
	.put_super	= hfs_put_super,
	.sync_fs	= hfs_sync_fs,
	.statfs		= hfs_statfs,
	.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,
};

static const struct fs_parameter_spec hfs_param_spec[] = {
	fsparam_u32	("uid",		opt_uid),
	fsparam_u32	("gid",		opt_gid),
	fsparam_u32oct	("umask",	opt_umask),
	fsparam_u32oct	("file_umask",	opt_file_umask),
	fsparam_u32oct	("dir_umask",	opt_dir_umask),
	fsparam_u32	("part",	opt_part),
	fsparam_u32	("session",	opt_session),
	fsparam_string	("type",	opt_type),
	fsparam_string	("creator",	opt_creator),
	fsparam_flag	("quiet",	opt_quiet),
	fsparam_string	("codepage",	opt_codepage),
	fsparam_string	("iocharset",	opt_iocharset),
	{}
};

/*
 * hfs_parse_param()
 *
 * This function is called by the vfs to parse the mount options.
 */
static int hfs_parse_param(struct fs_context *fc, struct fs_parameter *param)
{
	struct hfs_sb_info *hsb = fc->s_fs_info;
	struct fs_parse_result result;
	int opt;

	/* hfs does not honor any fs-specific options on remount */
	if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE)
		return 0;

	opt = fs_parse(fc, hfs_param_spec, param, &result);
	if (opt < 0)
		return opt;

	switch (opt) {
	case opt_uid:
		hsb->s_uid = result.uid;
		break;
	case opt_gid:
		hsb->s_gid = result.gid;
		break;
	case opt_umask:
		hsb->s_file_umask = (umode_t)result.uint_32;
		hsb->s_dir_umask = (umode_t)result.uint_32;
		break;
	case opt_file_umask:
		hsb->s_file_umask = (umode_t)result.uint_32;
		break;
	case opt_dir_umask:
		hsb->s_dir_umask = (umode_t)result.uint_32;
		break;
	case opt_part:
		hsb->part = result.uint_32;
		break;
	case opt_session:
		hsb->session = result.uint_32;
		break;
	case opt_type:
		if (strlen(param->string) != 4) {
			pr_err("type requires a 4 character value\n");
			return -EINVAL;
		}
		memcpy(&hsb->s_type, param->string, 4);
		break;
	case opt_creator:
		if (strlen(param->string) != 4) {
			pr_err("creator requires a 4 character value\n");
			return -EINVAL;
		}
		memcpy(&hsb->s_creator, param->string, 4);
		break;
	case opt_quiet:
		hsb->s_quiet = 1;
		break;
	case opt_codepage:
		if (hsb->nls_disk) {
			pr_err("unable to change codepage\n");
			return -EINVAL;
		}
		hsb->nls_disk = load_nls(param->string);
		if (!hsb->nls_disk) {
			pr_err("unable to load codepage \"%s\"\n",
					param->string);
			return -EINVAL;
		}
		break;
	case opt_iocharset:
		if (hsb->nls_io) {
			pr_err("unable to change iocharset\n");
			return -EINVAL;
		}
		hsb->nls_io = load_nls(param->string);
		if (!hsb->nls_io) {
			pr_err("unable to load iocharset \"%s\"\n",
					param->string);
			return -EINVAL;
		}
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

/*
 * 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, struct fs_context *fc)
{
	struct hfs_sb_info *sbi = HFS_SB(sb);
	struct hfs_find_data fd;
	hfs_cat_rec rec;
	struct inode *root_inode;
	int silent = fc->sb_flags & SB_SILENT;
	int res;

	/* load_nls_default does not fail */
	if (sbi->nls_disk && !sbi->nls_io)
		sbi->nls_io = load_nls_default();
	sbi->s_dir_umask &= 0777;
	sbi->s_file_umask &= 0577;

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

	sbi->sb = sb;
	sb->s_op = &hfs_super_operations;
	sb->s_xattr = hfs_xattr_handlers;
	sb->s_flags |= SB_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.dir)) {
			res =  -EIO;
			goto bail_hfs_find;
		}
		hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, fd.entrylength);
		if (rec.type != HFS_CDR_DIR)
			res = -EIO;
	}
	if (res)
		goto bail_hfs_find;
	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_hfs_find:
	hfs_find_exit(&fd);
bail_no_root:
	pr_err("get root inode failed\n");
bail:
	hfs_mdb_put(sb);
	return res;
}

static int hfs_get_tree(struct fs_context *fc)
{
	return get_tree_bdev(fc, hfs_fill_super);
}

static void hfs_free_fc(struct fs_context *fc)
{
	kfree(fc->s_fs_info);
}

static const struct fs_context_operations hfs_context_ops = {
	.parse_param	= hfs_parse_param,
	.get_tree	= hfs_get_tree,
	.reconfigure	= hfs_reconfigure,
	.free		= hfs_free_fc,
};

static int hfs_init_fs_context(struct fs_context *fc)
{
	struct hfs_sb_info *hsb;

	hsb = kzalloc(sizeof(struct hfs_sb_info), GFP_KERNEL);
	if (!hsb)
		return -ENOMEM;

	fc->s_fs_info = hsb;
	fc->ops = &hfs_context_ops;

	if (fc->purpose != FS_CONTEXT_FOR_RECONFIGURE) {
		/* initialize options 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 = cpu_to_be32(0x3f3f3f3f); /* == '????' */
		hsb->s_creator = cpu_to_be32(0x3f3f3f3f); /* == '????' */
		hsb->s_quiet = 0;
		hsb->part = -1;
		hsb->session = -1;
	}

	return 0;
}

static struct file_system_type hfs_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "hfs",
	.kill_sb	= kill_block_super,
	.fs_flags	= FS_REQUIRES_DEV,
	.init_fs_context = hfs_init_fs_context,
};
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>
ffcd06b6 ES	18	#include <linux/fs_context.h>
ffcd06b6 ES	19	#include <linux/fs_parser.h>
717dd80e	20	#include <linux/mount.h>
1da177e4	21	#include <linux/init.h>
328b9227	22	#include <linux/nls.h>
717dd80e	23	#include <linux/seq_file.h>
5a0e3ad6	24	#include <linux/slab.h>
1da177e4 LT	25	#include <linux/vfs.h>
	26
	27	#include "hfs_fs.h"
	28	#include "btree.h"
	29
e18b890b	30	static struct kmem_cache *hfs_inode_cachep;
1da177e4	31
64656602	32	MODULE_DESCRIPTION("Apple Macintosh file system support");
1da177e4 LT	33	MODULE_LICENSE("GPL");
1da177e4 LT	34
58bc5bbb CH	35	static int hfs_sync_fs(struct super_block *sb, int wait)
58bc5bbb CH	36	{
58bc5bbb	37	hfs_mdb_commit(sb);
58bc5bbb CH	38	return 0;
	39	}
	40
1da177e4 LT	41	/*
	42	* hfs_put_super()
	43	*
	44	* This is the put_super() entry in the super_operations structure for
	45	* HFS filesystems. The purpose is to release the resources
	46	* associated with the superblock sb.
	47	*/
	48	static void hfs_put_super(struct super_block *sb)
	49	{
5687b578	50	cancel_delayed_work_sync(&HFS_SB(sb)->mdb_work);
1da177e4 LT	51	hfs_mdb_close(sb);
	52	/* release the MDB's resources */
	53	hfs_mdb_put(sb);
	54	}
	55
5687b578 AB	56	static void flush_mdb(struct work_struct *work)
	57	{
	58	struct hfs_sb_info *sbi;
	59	struct super_block *sb;
	60
	61	sbi = container_of(work, struct hfs_sb_info, mdb_work.work);
	62	sb = sbi->sb;
	63
	64	spin_lock(&sbi->work_lock);
	65	sbi->work_queued = 0;
	66	spin_unlock(&sbi->work_lock);
	67
	68	hfs_mdb_commit(sb);
	69	}
	70
	71	void hfs_mark_mdb_dirty(struct super_block *sb)
	72	{
	73	struct hfs_sb_info *sbi = HFS_SB(sb);
	74	unsigned long delay;
	75
bc98a42c	76	if (sb_rdonly(sb))
5687b578 AB	77	return;
	78
	79	spin_lock(&sbi->work_lock);
	80	if (!sbi->work_queued) {
	81	delay = msecs_to_jiffies(dirty_writeback_interval * 10);
	82	queue_delayed_work(system_long_wq, &sbi->mdb_work, delay);
	83	sbi->work_queued = 1;
	84	}
	85	spin_unlock(&sbi->work_lock);
	86	}
	87
1da177e4 LT	88	/*
	89	* hfs_statfs()
	90	*
	91	* This is the statfs() entry in the super_operations structure for
	92	* HFS filesystems. The purpose is to return various data about the
	93	* filesystem.
	94	*
	95	* changed f_files/f_ffree to reflect the fs_ablock/free_ablocks.
	96	*/
726c3342	97	static int hfs_statfs(struct dentry dentry, struct kstatfs buf)
1da177e4	98	{
726c3342	99	struct super_block *sb = dentry->d_sb;
7dd2c000	100	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
726c3342	101
1da177e4 LT	102	buf->f_type = HFS_SUPER_MAGIC;
	103	buf->f_bsize = sb->s_blocksize;
	104	buf->f_blocks = (u32)HFS_SB(sb)->fs_ablocks * HFS_SB(sb)->fs_div;
	105	buf->f_bfree = (u32)HFS_SB(sb)->free_ablocks * HFS_SB(sb)->fs_div;
	106	buf->f_bavail = buf->f_bfree;
	107	buf->f_files = HFS_SB(sb)->fs_ablocks;
	108	buf->f_ffree = HFS_SB(sb)->free_ablocks;
6d1349c7	109	buf->f_fsid = u64_to_fsid(id);
1da177e4 LT	110	buf->f_namelen = HFS_NAMELEN;
	111
	112	return 0;
	113	}
	114
ffcd06b6	115	static int hfs_reconfigure(struct fs_context *fc)
1da177e4	116	{
ffcd06b6 ES	117	struct super_block *sb = fc->root->d_sb;
ffcd06b6 ES	118
02b9984d	119	sync_filesystem(sb);
ffcd06b6 ES	120	fc->sb_flags \|= SB_NODIRATIME;
ffcd06b6 ES	121	if ((bool)(fc->sb_flags & SB_RDONLY) == sb_rdonly(sb))
1da177e4	122	return 0;
ffcd06b6 ES	123
ffcd06b6 ES	124	if (!(fc->sb_flags & SB_RDONLY)) {
1da177e4	125	if (!(HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_UNMNT))) {
d6142673	126	pr_warn("filesystem was not cleanly unmounted, running fsck.hfs is recommended. leaving read-only.\n");
1751e8a6	127	sb->s_flags \|= SB_RDONLY;
ffcd06b6	128	fc->sb_flags \|= SB_RDONLY;
1da177e4	129	} else if (HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_SLOCK)) {
d6142673	130	pr_warn("filesystem is marked locked, leaving read-only.\n");
1751e8a6	131	sb->s_flags \|= SB_RDONLY;
ffcd06b6	132	fc->sb_flags \|= SB_RDONLY;
1da177e4 LT	133	}
	134	}
	135	return 0;
	136	}
	137
34c80b1d	138	static int hfs_show_options(struct seq_file seq, struct dentry root)
717dd80e	139	{
34c80b1d	140	struct hfs_sb_info *sbi = HFS_SB(root->d_sb);
717dd80e RZ	141
717dd80e RZ	142	if (sbi->s_creator != cpu_to_be32(0x3f3f3f3f))
a068acf2	143	seq_show_option_n(seq, "creator", (char *)&sbi->s_creator, 4);
717dd80e	144	if (sbi->s_type != cpu_to_be32(0x3f3f3f3f))
a068acf2	145	seq_show_option_n(seq, "type", (char *)&sbi->s_type, 4);
43b5e4cc EB	146	seq_printf(seq, ",uid=%u,gid=%u",
	147	from_kuid_munged(&init_user_ns, sbi->s_uid),
	148	from_kgid_munged(&init_user_ns, sbi->s_gid));
717dd80e RZ	149	if (sbi->s_file_umask != 0133)
	150	seq_printf(seq, ",file_umask=%o", sbi->s_file_umask);
	151	if (sbi->s_dir_umask != 0022)
	152	seq_printf(seq, ",dir_umask=%o", sbi->s_dir_umask);
	153	if (sbi->part >= 0)
	154	seq_printf(seq, ",part=%u", sbi->part);
	155	if (sbi->session >= 0)
	156	seq_printf(seq, ",session=%u", sbi->session);
328b9227 RZ	157	if (sbi->nls_disk)
	158	seq_printf(seq, ",codepage=%s", sbi->nls_disk->charset);
	159	if (sbi->nls_io)
	160	seq_printf(seq, ",iocharset=%s", sbi->nls_io->charset);
717dd80e RZ	161	if (sbi->s_quiet)
	162	seq_printf(seq, ",quiet");
	163	return 0;
	164	}
	165
1da177e4 LT	166	static struct inode hfs_alloc_inode(struct super_block sb)
	167	{
	168	struct hfs_inode_info *i;
	169
fd60b288	170	i = alloc_inode_sb(sb, hfs_inode_cachep, GFP_KERNEL);
1da177e4 LT	171	return i ? &i->vfs_inode : NULL;
	172	}
	173
6d845e22	174	static void hfs_free_inode(struct inode *inode)
1da177e4 LT	175	{
	176	kmem_cache_free(hfs_inode_cachep, HFS_I(inode));
	177	}
	178
ee9b6d61	179	static const struct super_operations hfs_super_operations = {
1da177e4	180	.alloc_inode = hfs_alloc_inode,
6d845e22	181	.free_inode = hfs_free_inode,
1da177e4	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	186	.statfs = hfs_statfs,
717dd80e	187	.show_options = hfs_show_options,
1da177e4 LT	188	};
	189
	190	enum {
	191	opt_uid, opt_gid, opt_umask, opt_file_umask, opt_dir_umask,
	192	opt_part, opt_session, opt_type, opt_creator, opt_quiet,
328b9227	193	opt_codepage, opt_iocharset,
1da177e4 LT	194	};
1da177e4 LT	195
ffcd06b6 ES	196	static const struct fs_parameter_spec hfs_param_spec[] = {
	197	fsparam_u32 ("uid", opt_uid),
	198	fsparam_u32 ("gid", opt_gid),
	199	fsparam_u32oct ("umask", opt_umask),
	200	fsparam_u32oct ("file_umask", opt_file_umask),
	201	fsparam_u32oct ("dir_umask", opt_dir_umask),
	202	fsparam_u32 ("part", opt_part),
	203	fsparam_u32 ("session", opt_session),
	204	fsparam_string ("type", opt_type),
	205	fsparam_string ("creator", opt_creator),
	206	fsparam_flag ("quiet", opt_quiet),
	207	fsparam_string ("codepage", opt_codepage),
	208	fsparam_string ("iocharset", opt_iocharset),
	209	{}
1da177e4 LT	210	};
1da177e4 LT	211
1da177e4	212	/*
ffcd06b6	213	* hfs_parse_param()
1da177e4	214	*
ffcd06b6	215	* This function is called by the vfs to parse the mount options.
1da177e4	216	*/
ffcd06b6	217	static int hfs_parse_param(struct fs_context fc, struct fs_parameter param)
1da177e4	218	{
ffcd06b6 ES	219	struct hfs_sb_info *hsb = fc->s_fs_info;
	220	struct fs_parse_result result;
	221	int opt;
	222
	223	/* hfs does not honor any fs-specific options on remount */
	224	if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE)
	225	return 0;
1da177e4	226
ffcd06b6 ES	227	opt = fs_parse(fc, hfs_param_spec, param, &result);
	228	if (opt < 0)
	229	return opt;
	230
	231	switch (opt) {
	232	case opt_uid:
	233	hsb->s_uid = result.uid;
	234	break;
	235	case opt_gid:
	236	hsb->s_gid = result.gid;
	237	break;
	238	case opt_umask:
	239	hsb->s_file_umask = (umode_t)result.uint_32;
	240	hsb->s_dir_umask = (umode_t)result.uint_32;
	241	break;
	242	case opt_file_umask:
	243	hsb->s_file_umask = (umode_t)result.uint_32;
	244	break;
	245	case opt_dir_umask:
	246	hsb->s_dir_umask = (umode_t)result.uint_32;
	247	break;
	248	case opt_part:
	249	hsb->part = result.uint_32;
	250	break;
	251	case opt_session:
	252	hsb->session = result.uint_32;
	253	break;
	254	case opt_type:
	255	if (strlen(param->string) != 4) {
	256	pr_err("type requires a 4 character value\n");
	257	return -EINVAL;
	258	}
	259	memcpy(&hsb->s_type, param->string, 4);
	260	break;
	261	case opt_creator:
	262	if (strlen(param->string) != 4) {
	263	pr_err("creator requires a 4 character value\n");
	264	return -EINVAL;
	265	}
	266	memcpy(&hsb->s_creator, param->string, 4);
	267	break;
	268	case opt_quiet:
	269	hsb->s_quiet = 1;
	270	break;
	271	case opt_codepage:
	272	if (hsb->nls_disk) {
	273	pr_err("unable to change codepage\n");
	274	return -EINVAL;
	275	}
	276	hsb->nls_disk = load_nls(param->string);
	277	if (!hsb->nls_disk) {
	278	pr_err("unable to load codepage \"%s\"\n",
	279	param->string);
	280	return -EINVAL;
	281	}
	282	break;
	283	case opt_iocharset:
	284	if (hsb->nls_io) {
	285	pr_err("unable to change iocharset\n");
	286	return -EINVAL;
	287	}
	288	hsb->nls_io = load_nls(param->string);
328b9227	289	if (!hsb->nls_io) {
ffcd06b6 ES	290	pr_err("unable to load iocharset \"%s\"\n",
	291	param->string);
	292	return -EINVAL;
328b9227	293	}
ffcd06b6 ES	294	break;
	295	default:
	296	return -EINVAL;
328b9227	297	}
1da177e4	298
ffcd06b6	299	return 0;
1da177e4 LT	300	}
	301
	302	/*
	303	* hfs_read_super()
	304	*
	305	* This is the function that is responsible for mounting an HFS
	306	* filesystem. It performs all the tasks necessary to get enough data
	307	* from the disk to read the root inode. This includes parsing the
	308	* mount options, dealing with Macintosh partitions, reading the
	309	* superblock and the allocation bitmap blocks, calling
	310	* hfs_btree_init() to get the necessary data about the extents and
	311	* catalog B-trees and, finally, reading the root inode into memory.
	312	*/
ffcd06b6	313	static int hfs_fill_super(struct super_block sb, struct fs_context fc)
1da177e4	314	{
ffcd06b6	315	struct hfs_sb_info *sbi = HFS_SB(sb);
1da177e4 LT	316	struct hfs_find_data fd;
	317	hfs_cat_rec rec;
	318	struct inode *root_inode;
ffcd06b6	319	int silent = fc->sb_flags & SB_SILENT;
1da177e4 LT	320	int res;
1da177e4 LT	321
ffcd06b6 ES	322	/* load_nls_default does not fail */
	323	if (sbi->nls_disk && !sbi->nls_io)
	324	sbi->nls_io = load_nls_default();
	325	sbi->s_dir_umask &= 0777;
	326	sbi->s_file_umask &= 0577;
8526fb37	327
5687b578 AB	328	spin_lock_init(&sbi->work_lock);
5687b578 AB	329	INIT_DELAYED_WORK(&sbi->mdb_work, flush_mdb);
1da177e4	330
ffcd06b6	331	sbi->sb = sb;
1da177e4	332	sb->s_op = &hfs_super_operations;
b8020eff	333	sb->s_xattr = hfs_xattr_handlers;
1751e8a6	334	sb->s_flags \|= SB_NODIRATIME;
3084b72d	335	mutex_init(&sbi->bitmap_lock);
1da177e4 LT	336
	337	res = hfs_mdb_get(sb);
	338	if (res) {
	339	if (!silent)
d6142673	340	pr_warn("can't find a HFS filesystem on dev %s\n",
1da177e4 LT	341	hfs_mdb_name(sb));
1da177e4 LT	342	res = -EINVAL;
945b0920	343	goto bail;
1da177e4 LT	344	}
	345
	346	/* try to get the root inode */
9509f178 AK	347	res = hfs_find_init(HFS_SB(sb)->cat_tree, &fd);
	348	if (res)
	349	goto bail_no_root;
1da177e4	350	res = hfs_cat_find_brec(sb, HFS_ROOT_CNID, &fd);
ec81aecb	351	if (!res) {
b905bafd	352	if (fd.entrylength != sizeof(rec.dir)) {
ec81aecb	353	res = -EIO;
16ee572e	354	goto bail_hfs_find;
ec81aecb	355	}
1da177e4	356	hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, fd.entrylength);
b905bafd LS	357	if (rec.type != HFS_CDR_DIR)
b905bafd LS	358	res = -EIO;
ec81aecb	359	}
16ee572e DCZX	360	if (res)
16ee572e DCZX	361	goto bail_hfs_find;
d6ddf554	362	res = -EINVAL;
1da177e4 LT	363	root_inode = hfs_iget(sb, &fd.search_key->cat, &rec);
	364	hfs_find_exit(&fd);
	365	if (!root_inode)
	366	goto bail_no_root;
	367
518c79d2	368	sb->s_d_op = &hfs_dentry_operations;
d6ddf554	369	res = -ENOMEM;
48fde701	370	sb->s_root = d_make_root(root_inode);
1da177e4	371	if (!sb->s_root)
48fde701	372	goto bail_no_root;
1da177e4	373
1da177e4 LT	374	/* everything's okay */
	375	return 0;
	376
16ee572e DCZX	377	bail_hfs_find:
16ee572e DCZX	378	hfs_find_exit(&fd);
1da177e4	379	bail_no_root:
d6142673	380	pr_err("get root inode failed\n");
945b0920	381	bail:
1da177e4	382	hfs_mdb_put(sb);
1da177e4 LT	383	return res;
	384	}
	385
ffcd06b6 ES	386	static int hfs_get_tree(struct fs_context *fc)
	387	{
	388	return get_tree_bdev(fc, hfs_fill_super);
	389	}
	390
	391	static void hfs_free_fc(struct fs_context *fc)
	392	{
	393	kfree(fc->s_fs_info);
	394	}
	395
	396	static const struct fs_context_operations hfs_context_ops = {
	397	.parse_param = hfs_parse_param,
	398	.get_tree = hfs_get_tree,
	399	.reconfigure = hfs_reconfigure,
	400	.free = hfs_free_fc,
	401	};
	402
	403	static int hfs_init_fs_context(struct fs_context *fc)
1da177e4	404	{
ffcd06b6 ES	405	struct hfs_sb_info *hsb;
	406
	407	hsb = kzalloc(sizeof(struct hfs_sb_info), GFP_KERNEL);
	408	if (!hsb)
	409	return -ENOMEM;
	410
	411	fc->s_fs_info = hsb;
	412	fc->ops = &hfs_context_ops;
	413
	414	if (fc->purpose != FS_CONTEXT_FOR_RECONFIGURE) {
	415	/* initialize options with defaults */
	416	hsb->s_uid = current_uid();
	417	hsb->s_gid = current_gid();
	418	hsb->s_file_umask = 0133;
	419	hsb->s_dir_umask = 0022;
	420	hsb->s_type = cpu_to_be32(0x3f3f3f3f); /* == '????' */
	421	hsb->s_creator = cpu_to_be32(0x3f3f3f3f); /* == '????' */
	422	hsb->s_quiet = 0;
	423	hsb->part = -1;
	424	hsb->session = -1;
	425	}
	426
	427	return 0;
1da177e4 LT	428	}
	429
	430	static struct file_system_type hfs_fs_type = {
	431	.owner = THIS_MODULE,
	432	.name = "hfs",
1da177e4 LT	433	.kill_sb = kill_block_super,
1da177e4 LT	434	.fs_flags = FS_REQUIRES_DEV,
ffcd06b6	435	.init_fs_context = hfs_init_fs_context,
1da177e4	436	};
7f78e035	437	MODULE_ALIAS_FS("hfs");
1da177e4	438
51cc5068	439	static void hfs_init_once(void *p)
1da177e4 LT	440	{
	441	struct hfs_inode_info *i = p;
	442
a35afb83	443	inode_init_once(&i->vfs_inode);
1da177e4 LT	444	}
	445
	446	static int __init init_hfs_fs(void)
	447	{
	448	int err;
	449
	450	hfs_inode_cachep = kmem_cache_create("hfs_inode_cache",
5d097056 VD	451	sizeof(struct hfs_inode_info), 0,
5d097056 VD	452	SLAB_HWCACHE_ALIGN\|SLAB_ACCOUNT, hfs_init_once);
1da177e4 LT	453	if (!hfs_inode_cachep)
	454	return -ENOMEM;
	455	err = register_filesystem(&hfs_fs_type);
	456	if (err)
	457	kmem_cache_destroy(hfs_inode_cachep);
	458	return err;
	459	}
	460
	461	static void __exit exit_hfs_fs(void)
	462	{
	463	unregister_filesystem(&hfs_fs_type);
8c0a8537 KS	464
	465	/*
	466	* Make sure all delayed rcu free inodes are flushed before we
	467	* destroy cache.
	468	*/
	469	rcu_barrier();
1a1d92c1	470	kmem_cache_destroy(hfs_inode_cachep);
1da177e4 LT	471	}
	472
	473	module_init(init_hfs_fs)
	474	module_exit(exit_hfs_fs)