[mirror_ubuntu-bionic-kernel.git] / fs / hfsplus / super.c

/*
 *  linux/fs/hfsplus/super.c
 *
 * Copyright (C) 2001
 * Brad Boyer (flar@allandria.com)
 * (C) 2003 Ardis Technologies <roman@ardistech.com>
 *
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/pagemap.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/vfs.h>
#include <linux/nls.h>

static struct inode *hfsplus_alloc_inode(struct super_block *sb);
static void hfsplus_destroy_inode(struct inode *inode);

#include "hfsplus_fs.h"

struct inode *hfsplus_iget(struct super_block *sb, unsigned long ino)
{
	struct hfs_find_data fd;
	struct hfsplus_vh *vhdr;
	struct inode *inode;
	long err = -EIO;

	inode = iget_locked(sb, ino);
	if (!inode)
		return ERR_PTR(-ENOMEM);
	if (!(inode->i_state & I_NEW))
		return inode;

	INIT_LIST_HEAD(&HFSPLUS_I(inode)->open_dir_list);
	mutex_init(&HFSPLUS_I(inode)->extents_lock);
	HFSPLUS_I(inode)->flags = 0;
	HFSPLUS_I(inode)->rsrc_inode = NULL;
	atomic_set(&HFSPLUS_I(inode)->opencnt, 0);

	if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
	read_inode:
		hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd);
		err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
		if (!err)
			err = hfsplus_cat_read_inode(inode, &fd);
		hfs_find_exit(&fd);
		if (err)
			goto bad_inode;
		goto done;
	}
	vhdr = HFSPLUS_SB(inode->i_sb)->s_vhdr;
	switch(inode->i_ino) {
	case HFSPLUS_ROOT_CNID:
		goto read_inode;
	case HFSPLUS_EXT_CNID:
		hfsplus_inode_read_fork(inode, &vhdr->ext_file);
		inode->i_mapping->a_ops = &hfsplus_btree_aops;
		break;
	case HFSPLUS_CAT_CNID:
		hfsplus_inode_read_fork(inode, &vhdr->cat_file);
		inode->i_mapping->a_ops = &hfsplus_btree_aops;
		break;
	case HFSPLUS_ALLOC_CNID:
		hfsplus_inode_read_fork(inode, &vhdr->alloc_file);
		inode->i_mapping->a_ops = &hfsplus_aops;
		break;
	case HFSPLUS_START_CNID:
		hfsplus_inode_read_fork(inode, &vhdr->start_file);
		break;
	case HFSPLUS_ATTR_CNID:
		hfsplus_inode_read_fork(inode, &vhdr->attr_file);
		inode->i_mapping->a_ops = &hfsplus_btree_aops;
		break;
	default:
		goto bad_inode;
	}

done:
	unlock_new_inode(inode);
	return inode;

bad_inode:
	iget_failed(inode);
	return ERR_PTR(err);
}

static int hfsplus_write_inode(struct inode *inode,
		struct writeback_control *wbc)
{
	struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
	struct hfsplus_vh *vhdr;
	int ret = 0;

	dprint(DBG_INODE, "hfsplus_write_inode: %lu\n", inode->i_ino);
	hfsplus_ext_write_extent(inode);
	if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
		return hfsplus_cat_write_inode(inode);
	}
	vhdr = sbi->s_vhdr;
	switch (inode->i_ino) {
	case HFSPLUS_ROOT_CNID:
		ret = hfsplus_cat_write_inode(inode);
		break;
	case HFSPLUS_EXT_CNID:
		if (vhdr->ext_file.total_size != cpu_to_be64(inode->i_size)) {
			sbi->flags |= HFSPLUS_SB_WRITEBACKUP;
			inode->i_sb->s_dirt = 1;
		}
		hfsplus_inode_write_fork(inode, &vhdr->ext_file);
		hfs_btree_write(sbi->ext_tree);
		break;
	case HFSPLUS_CAT_CNID:
		if (vhdr->cat_file.total_size != cpu_to_be64(inode->i_size)) {
			sbi->flags |= HFSPLUS_SB_WRITEBACKUP;
			inode->i_sb->s_dirt = 1;
		}
		hfsplus_inode_write_fork(inode, &vhdr->cat_file);
		hfs_btree_write(sbi->cat_tree);
		break;
	case HFSPLUS_ALLOC_CNID:
		if (vhdr->alloc_file.total_size != cpu_to_be64(inode->i_size)) {
			sbi->flags |= HFSPLUS_SB_WRITEBACKUP;
			inode->i_sb->s_dirt = 1;
		}
		hfsplus_inode_write_fork(inode, &vhdr->alloc_file);
		break;
	case HFSPLUS_START_CNID:
		if (vhdr->start_file.total_size != cpu_to_be64(inode->i_size)) {
			sbi->flags |= HFSPLUS_SB_WRITEBACKUP;
			inode->i_sb->s_dirt = 1;
		}
		hfsplus_inode_write_fork(inode, &vhdr->start_file);
		break;
	case HFSPLUS_ATTR_CNID:
		if (vhdr->attr_file.total_size != cpu_to_be64(inode->i_size)) {
			sbi->flags |= HFSPLUS_SB_WRITEBACKUP;
			inode->i_sb->s_dirt = 1;
		}
		hfsplus_inode_write_fork(inode, &vhdr->attr_file);
		hfs_btree_write(sbi->attr_tree);
		break;
	}
	return ret;
}

static void hfsplus_evict_inode(struct inode *inode)
{
	dprint(DBG_INODE, "hfsplus_evict_inode: %lu\n", inode->i_ino);
	truncate_inode_pages(&inode->i_data, 0);
	end_writeback(inode);
	if (HFSPLUS_IS_RSRC(inode)) {
		HFSPLUS_I(HFSPLUS_I(inode)->rsrc_inode)->rsrc_inode = NULL;
		iput(HFSPLUS_I(inode)->rsrc_inode);
	}
}

int hfsplus_sync_fs(struct super_block *sb, int wait)
{
	struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
	struct hfsplus_vh *vhdr = sbi->s_vhdr;

	dprint(DBG_SUPER, "hfsplus_write_super\n");

	mutex_lock(&sbi->alloc_mutex);
	sb->s_dirt = 0;

	vhdr->free_blocks = cpu_to_be32(sbi->free_blocks);
	vhdr->next_alloc = cpu_to_be32(sbi->next_alloc);
	vhdr->next_cnid = cpu_to_be32(sbi->next_cnid);
	vhdr->folder_count = cpu_to_be32(sbi->folder_count);
	vhdr->file_count = cpu_to_be32(sbi->file_count);

	mark_buffer_dirty(sbi->s_vhbh);
	if (sbi->flags & HFSPLUS_SB_WRITEBACKUP) {
		if (sbi->sect_count) {
			struct buffer_head *bh;
			u32 block, offset;

			block = sbi->blockoffset;
			block += (sbi->sect_count - 2) >> (sb->s_blocksize_bits - 9);
			offset = ((sbi->sect_count - 2) << 9) & (sb->s_blocksize - 1);
			printk(KERN_DEBUG "hfs: backup: %u,%u,%u,%u\n",
					  sbi->blockoffset, sbi->sect_count,
					  block, offset);
			bh = sb_bread(sb, block);
			if (bh) {
				vhdr = (struct hfsplus_vh *)(bh->b_data + offset);
				if (be16_to_cpu(vhdr->signature) == HFSPLUS_VOLHEAD_SIG) {
					memcpy(vhdr, sbi->s_vhdr, sizeof(*vhdr));
					mark_buffer_dirty(bh);
					brelse(bh);
				} else
					printk(KERN_WARNING "hfs: backup not found!\n");
			}
		}
		sbi->flags &= ~HFSPLUS_SB_WRITEBACKUP;
	}
	mutex_unlock(&sbi->alloc_mutex);
	return 0;
}

static void hfsplus_write_super(struct super_block *sb)
{
	if (!(sb->s_flags & MS_RDONLY))
		hfsplus_sync_fs(sb, 1);
	else
		sb->s_dirt = 0;
}

static void hfsplus_put_super(struct super_block *sb)
{
	struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);

	dprint(DBG_SUPER, "hfsplus_put_super\n");

	if (!sb->s_fs_info)
		return;

	if (sb->s_dirt)
		hfsplus_write_super(sb);
	if (!(sb->s_flags & MS_RDONLY) && sbi->s_vhdr) {
		struct hfsplus_vh *vhdr = sbi->s_vhdr;

		vhdr->modify_date = hfsp_now2mt();
		vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT);
		vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
		mark_buffer_dirty(sbi->s_vhbh);
		sync_dirty_buffer(sbi->s_vhbh);
	}

	hfs_btree_close(sbi->cat_tree);
	hfs_btree_close(sbi->ext_tree);
	iput(sbi->alloc_file);
	iput(sbi->hidden_dir);
	brelse(sbi->s_vhbh);
	unload_nls(sbi->nls);
	kfree(sb->s_fs_info);
	sb->s_fs_info = NULL;
}

static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf)
{
	struct super_block *sb = dentry->d_sb;
	struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);

	buf->f_type = HFSPLUS_SUPER_MAGIC;
	buf->f_bsize = sb->s_blocksize;
	buf->f_blocks = sbi->total_blocks << sbi->fs_shift;
	buf->f_bfree = sbi->free_blocks << sbi->fs_shift;
	buf->f_bavail = buf->f_bfree;
	buf->f_files = 0xFFFFFFFF;
	buf->f_ffree = 0xFFFFFFFF - sbi->next_cnid;
	buf->f_fsid.val[0] = (u32)id;
	buf->f_fsid.val[1] = (u32)(id >> 32);
	buf->f_namelen = HFSPLUS_MAX_STRLEN;

	return 0;
}

static int hfsplus_remount(struct super_block *sb, int *flags, char *data)
{
	if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
		return 0;
	if (!(*flags & MS_RDONLY)) {
		struct hfsplus_vh *vhdr = HFSPLUS_SB(sb)->s_vhdr;
		struct hfsplus_sb_info sbi;

		memset(&sbi, 0, sizeof(struct hfsplus_sb_info));
		sbi.nls = HFSPLUS_SB(sb)->nls;
		if (!hfsplus_parse_options(data, &sbi))
			return -EINVAL;

		if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
			printk(KERN_WARNING "hfs: filesystem was not cleanly unmounted, "
			       "running fsck.hfsplus is recommended.  leaving read-only.\n");
			sb->s_flags |= MS_RDONLY;
			*flags |= MS_RDONLY;
		} else if (sbi.flags & HFSPLUS_SB_FORCE) {
			/* nothing */
		} else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
			printk(KERN_WARNING "hfs: filesystem is marked locked, leaving read-only.\n");
			sb->s_flags |= MS_RDONLY;
			*flags |= MS_RDONLY;
		} else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) {
			printk(KERN_WARNING "hfs: filesystem is marked journaled, leaving read-only.\n");
			sb->s_flags |= MS_RDONLY;
			*flags |= MS_RDONLY;
		}
	}
	return 0;
}

static const struct super_operations hfsplus_sops = {
	.alloc_inode	= hfsplus_alloc_inode,
	.destroy_inode	= hfsplus_destroy_inode,
	.write_inode	= hfsplus_write_inode,
	.evict_inode	= hfsplus_evict_inode,
	.put_super	= hfsplus_put_super,
	.write_super	= hfsplus_write_super,
	.sync_fs	= hfsplus_sync_fs,
	.statfs		= hfsplus_statfs,
	.remount_fs	= hfsplus_remount,
	.show_options	= hfsplus_show_options,
};

static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
{
	struct hfsplus_vh *vhdr;
	struct hfsplus_sb_info *sbi;
	hfsplus_cat_entry entry;
	struct hfs_find_data fd;
	struct inode *root, *inode;
	struct qstr str;
	struct nls_table *nls = NULL;
	int err = -EINVAL;

	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
	if (!sbi)
		return -ENOMEM;

	sb->s_fs_info = sbi;
	INIT_HLIST_HEAD(&sbi->rsrc_inodes);
	mutex_init(&sbi->alloc_mutex);
	hfsplus_fill_defaults(sbi);
	if (!hfsplus_parse_options(data, sbi)) {
		printk(KERN_ERR "hfs: unable to parse mount options\n");
		err = -EINVAL;
		goto cleanup;
	}

	/* temporarily use utf8 to correctly find the hidden dir below */
	nls = sbi->nls;
	sbi->nls = load_nls("utf8");
	if (!sbi->nls) {
		printk(KERN_ERR "hfs: unable to load nls for utf8\n");
		err = -EINVAL;
		goto cleanup;
	}

	/* Grab the volume header */
	if (hfsplus_read_wrapper(sb)) {
		if (!silent)
			printk(KERN_WARNING "hfs: unable to find HFS+ superblock\n");
		err = -EINVAL;
		goto cleanup;
	}
	vhdr = sbi->s_vhdr;

	/* Copy parts of the volume header into the superblock */
	sb->s_magic = HFSPLUS_VOLHEAD_SIG;
	if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION ||
	    be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) {
		printk(KERN_ERR "hfs: wrong filesystem version\n");
		goto cleanup;
	}
	sbi->total_blocks = be32_to_cpu(vhdr->total_blocks);
	sbi->free_blocks = be32_to_cpu(vhdr->free_blocks);
	sbi->next_alloc = be32_to_cpu(vhdr->next_alloc);
	sbi->next_cnid = be32_to_cpu(vhdr->next_cnid);
	sbi->file_count = be32_to_cpu(vhdr->file_count);
	sbi->folder_count = be32_to_cpu(vhdr->folder_count);
	sbi->data_clump_blocks =
		be32_to_cpu(vhdr->data_clump_sz) >> sbi->alloc_blksz_shift;
	if (!sbi->data_clump_blocks)
		sbi->data_clump_blocks = 1;
	sbi->rsrc_clump_blocks =
		be32_to_cpu(vhdr->rsrc_clump_sz) >> sbi->alloc_blksz_shift;
	if (!sbi->rsrc_clump_blocks)
		sbi->rsrc_clump_blocks = 1;

	/* Set up operations so we can load metadata */
	sb->s_op = &hfsplus_sops;
	sb->s_maxbytes = MAX_LFS_FILESIZE;

	if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
		printk(KERN_WARNING "hfs: Filesystem was not cleanly unmounted, "
		       "running fsck.hfsplus is recommended.  mounting read-only.\n");
		sb->s_flags |= MS_RDONLY;
	} else if (sbi->flags & HFSPLUS_SB_FORCE) {
		/* nothing */
	} else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
		printk(KERN_WARNING "hfs: Filesystem is marked locked, mounting read-only.\n");
		sb->s_flags |= MS_RDONLY;
	} else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) && !(sb->s_flags & MS_RDONLY)) {
		printk(KERN_WARNING "hfs: write access to a journaled filesystem is not supported, "
		       "use the force option at your own risk, mounting read-only.\n");
		sb->s_flags |= MS_RDONLY;
	}
	sbi->flags &= ~HFSPLUS_SB_FORCE;

	/* Load metadata objects (B*Trees) */
	sbi->ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
	if (!sbi->ext_tree) {
		printk(KERN_ERR "hfs: failed to load extents file\n");
		goto cleanup;
	}
	sbi->cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
	if (!sbi->cat_tree) {
		printk(KERN_ERR "hfs: failed to load catalog file\n");
		goto cleanup;
	}

	inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID);
	if (IS_ERR(inode)) {
		printk(KERN_ERR "hfs: failed to load allocation file\n");
		err = PTR_ERR(inode);
		goto cleanup;
	}
	sbi->alloc_file = inode;

	/* Load the root directory */
	root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID);
	if (IS_ERR(root)) {
		printk(KERN_ERR "hfs: failed to load root directory\n");
		err = PTR_ERR(root);
		goto cleanup;
	}
	sb->s_root = d_alloc_root(root);
	if (!sb->s_root) {
		iput(root);
		err = -ENOMEM;
		goto cleanup;
	}
	sb->s_root->d_op = &hfsplus_dentry_operations;

	str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
	str.name = HFSP_HIDDENDIR_NAME;
	hfs_find_init(sbi->cat_tree, &fd);
	hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
	if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
		hfs_find_exit(&fd);
		if (entry.type != cpu_to_be16(HFSPLUS_FOLDER))
			goto cleanup;
		inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id));
		if (IS_ERR(inode)) {
			err = PTR_ERR(inode);
			goto cleanup;
		}
		sbi->hidden_dir = inode;
	} else
		hfs_find_exit(&fd);

	if (sb->s_flags & MS_RDONLY)
		goto out;

	/* H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
	 * all three are registered with Apple for our use
	 */
	vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
	vhdr->modify_date = hfsp_now2mt();
	be32_add_cpu(&vhdr->write_count, 1);
	vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
	vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
	mark_buffer_dirty(sbi->s_vhbh);
	sync_dirty_buffer(sbi->s_vhbh);

	if (!sbi->hidden_dir) {
		printk(KERN_DEBUG "hfs: create hidden dir...\n");
		sbi->hidden_dir = hfsplus_new_inode(sb, S_IFDIR);
		hfsplus_create_cat(sbi->hidden_dir->i_ino, sb->s_root->d_inode,
				   &str, sbi->hidden_dir);
		mark_inode_dirty(sbi->hidden_dir);
	}
out:
	unload_nls(sbi->nls);
	sbi->nls = nls;
	return 0;

cleanup:
	hfsplus_put_super(sb);
	unload_nls(nls);
	return err;
}

MODULE_AUTHOR("Brad Boyer");
MODULE_DESCRIPTION("Extended Macintosh Filesystem");
MODULE_LICENSE("GPL");

static struct kmem_cache *hfsplus_inode_cachep;

static struct inode *hfsplus_alloc_inode(struct super_block *sb)
{
	struct hfsplus_inode_info *i;

	i = kmem_cache_alloc(hfsplus_inode_cachep, GFP_KERNEL);
	return i ? &i->vfs_inode : NULL;
}

static void hfsplus_destroy_inode(struct inode *inode)
{
	kmem_cache_free(hfsplus_inode_cachep, HFSPLUS_I(inode));
}

#define HFSPLUS_INODE_SIZE	sizeof(struct hfsplus_inode_info)

static int hfsplus_get_sb(struct file_system_type *fs_type,
			  int flags, const char *dev_name, void *data,
			  struct vfsmount *mnt)
{
	return get_sb_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super,
			   mnt);
}

static struct file_system_type hfsplus_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "hfsplus",
	.get_sb		= hfsplus_get_sb,
	.kill_sb	= kill_block_super,
	.fs_flags	= FS_REQUIRES_DEV,
};

static void hfsplus_init_once(void *p)
{
	struct hfsplus_inode_info *i = p;

	inode_init_once(&i->vfs_inode);
}

static int __init init_hfsplus_fs(void)
{
	int err;

	hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache",
		HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN,
		hfsplus_init_once);
	if (!hfsplus_inode_cachep)
		return -ENOMEM;
	err = register_filesystem(&hfsplus_fs_type);
	if (err)
		kmem_cache_destroy(hfsplus_inode_cachep);
	return err;
}

static void __exit exit_hfsplus_fs(void)
{
	unregister_filesystem(&hfsplus_fs_type);
	kmem_cache_destroy(hfsplus_inode_cachep);
}

module_init(init_hfsplus_fs)
module_exit(exit_hfsplus_fs)
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/hfsplus/super.c
	3	*
	4	* Copyright (C) 2001
	5	* Brad Boyer (flar@allandria.com)
	6	* (C) 2003 Ardis Technologies <roman@ardistech.com>
	7	*
	8	*/
	9
1da177e4 LT	10	#include <linux/module.h>
	11	#include <linux/init.h>
	12	#include <linux/pagemap.h>
	13	#include <linux/fs.h>
1da177e4	14	#include <linux/slab.h>
1da177e4 LT	15	#include <linux/vfs.h>
	16	#include <linux/nls.h>
	17
	18	static struct inode hfsplus_alloc_inode(struct super_block sb);
	19	static void hfsplus_destroy_inode(struct inode *inode);
	20
	21	#include "hfsplus_fs.h"
	22
63525391	23	struct inode hfsplus_iget(struct super_block sb, unsigned long ino)
1da177e4 LT	24	{
	25	struct hfs_find_data fd;
	26	struct hfsplus_vh *vhdr;
63525391 DH	27	struct inode *inode;
	28	long err = -EIO;
	29
	30	inode = iget_locked(sb, ino);
	31	if (!inode)
	32	return ERR_PTR(-ENOMEM);
	33	if (!(inode->i_state & I_NEW))
	34	return inode;
1da177e4	35
6af502de CH	36	INIT_LIST_HEAD(&HFSPLUS_I(inode)->open_dir_list);
	37	mutex_init(&HFSPLUS_I(inode)->extents_lock);
	38	HFSPLUS_I(inode)->flags = 0;
	39	HFSPLUS_I(inode)->rsrc_inode = NULL;
	40	atomic_set(&HFSPLUS_I(inode)->opencnt, 0);
1da177e4 LT	41
	42	if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
	43	read_inode:
dd73a01a	44	hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd);
1da177e4 LT	45	err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
	46	if (!err)
	47	err = hfsplus_cat_read_inode(inode, &fd);
	48	hfs_find_exit(&fd);
	49	if (err)
	50	goto bad_inode;
63525391	51	goto done;
1da177e4	52	}
dd73a01a	53	vhdr = HFSPLUS_SB(inode->i_sb)->s_vhdr;
1da177e4 LT	54	switch(inode->i_ino) {
	55	case HFSPLUS_ROOT_CNID:
	56	goto read_inode;
	57	case HFSPLUS_EXT_CNID:
	58	hfsplus_inode_read_fork(inode, &vhdr->ext_file);
	59	inode->i_mapping->a_ops = &hfsplus_btree_aops;
	60	break;
	61	case HFSPLUS_CAT_CNID:
	62	hfsplus_inode_read_fork(inode, &vhdr->cat_file);
	63	inode->i_mapping->a_ops = &hfsplus_btree_aops;
	64	break;
	65	case HFSPLUS_ALLOC_CNID:
	66	hfsplus_inode_read_fork(inode, &vhdr->alloc_file);
	67	inode->i_mapping->a_ops = &hfsplus_aops;
	68	break;
	69	case HFSPLUS_START_CNID:
	70	hfsplus_inode_read_fork(inode, &vhdr->start_file);
	71	break;
	72	case HFSPLUS_ATTR_CNID:
	73	hfsplus_inode_read_fork(inode, &vhdr->attr_file);
	74	inode->i_mapping->a_ops = &hfsplus_btree_aops;
	75	break;
	76	default:
	77	goto bad_inode;
	78	}
	79
63525391 DH	80	done:
	81	unlock_new_inode(inode);
	82	return inode;
1da177e4	83
63525391 DH	84	bad_inode:
	85	iget_failed(inode);
	86	return ERR_PTR(err);
1da177e4 LT	87	}
1da177e4 LT	88
a9185b41 CH	89	static int hfsplus_write_inode(struct inode *inode,
a9185b41 CH	90	struct writeback_control *wbc)
1da177e4	91	{
dd73a01a	92	struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
1da177e4 LT	93	struct hfsplus_vh *vhdr;
	94	int ret = 0;
	95
	96	dprint(DBG_INODE, "hfsplus_write_inode: %lu\n", inode->i_ino);
	97	hfsplus_ext_write_extent(inode);
	98	if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
	99	return hfsplus_cat_write_inode(inode);
	100	}
dd73a01a	101	vhdr = sbi->s_vhdr;
1da177e4 LT	102	switch (inode->i_ino) {
	103	case HFSPLUS_ROOT_CNID:
	104	ret = hfsplus_cat_write_inode(inode);
	105	break;
	106	case HFSPLUS_EXT_CNID:
	107	if (vhdr->ext_file.total_size != cpu_to_be64(inode->i_size)) {
dd73a01a	108	sbi->flags \|= HFSPLUS_SB_WRITEBACKUP;
1da177e4 LT	109	inode->i_sb->s_dirt = 1;
	110	}
	111	hfsplus_inode_write_fork(inode, &vhdr->ext_file);
dd73a01a	112	hfs_btree_write(sbi->ext_tree);
1da177e4 LT	113	break;
	114	case HFSPLUS_CAT_CNID:
	115	if (vhdr->cat_file.total_size != cpu_to_be64(inode->i_size)) {
dd73a01a	116	sbi->flags \|= HFSPLUS_SB_WRITEBACKUP;
1da177e4 LT	117	inode->i_sb->s_dirt = 1;
	118	}
	119	hfsplus_inode_write_fork(inode, &vhdr->cat_file);
dd73a01a	120	hfs_btree_write(sbi->cat_tree);
1da177e4 LT	121	break;
	122	case HFSPLUS_ALLOC_CNID:
	123	if (vhdr->alloc_file.total_size != cpu_to_be64(inode->i_size)) {
dd73a01a	124	sbi->flags \|= HFSPLUS_SB_WRITEBACKUP;
1da177e4 LT	125	inode->i_sb->s_dirt = 1;
	126	}
	127	hfsplus_inode_write_fork(inode, &vhdr->alloc_file);
	128	break;
	129	case HFSPLUS_START_CNID:
	130	if (vhdr->start_file.total_size != cpu_to_be64(inode->i_size)) {
dd73a01a	131	sbi->flags \|= HFSPLUS_SB_WRITEBACKUP;
1da177e4 LT	132	inode->i_sb->s_dirt = 1;
	133	}
	134	hfsplus_inode_write_fork(inode, &vhdr->start_file);
	135	break;
	136	case HFSPLUS_ATTR_CNID:
	137	if (vhdr->attr_file.total_size != cpu_to_be64(inode->i_size)) {
dd73a01a	138	sbi->flags \|= HFSPLUS_SB_WRITEBACKUP;
1da177e4 LT	139	inode->i_sb->s_dirt = 1;
	140	}
	141	hfsplus_inode_write_fork(inode, &vhdr->attr_file);
dd73a01a	142	hfs_btree_write(sbi->attr_tree);
1da177e4 LT	143	break;
	144	}
	145	return ret;
	146	}
	147
b57922d9	148	static void hfsplus_evict_inode(struct inode *inode)
1da177e4	149	{
b57922d9 AV	150	dprint(DBG_INODE, "hfsplus_evict_inode: %lu\n", inode->i_ino);
	151	truncate_inode_pages(&inode->i_data, 0);
	152	end_writeback(inode);
1da177e4	153	if (HFSPLUS_IS_RSRC(inode)) {
6af502de CH	154	HFSPLUS_I(HFSPLUS_I(inode)->rsrc_inode)->rsrc_inode = NULL;
6af502de CH	155	iput(HFSPLUS_I(inode)->rsrc_inode);
1da177e4	156	}
1da177e4 LT	157	}
1da177e4 LT	158
b5fc510c	159	int hfsplus_sync_fs(struct super_block *sb, int wait)
1da177e4	160	{
dd73a01a CH	161	struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
dd73a01a CH	162	struct hfsplus_vh *vhdr = sbi->s_vhdr;
1da177e4 LT	163
1da177e4 LT	164	dprint(DBG_SUPER, "hfsplus_write_super\n");
ebc1ac16	165
dd73a01a	166	mutex_lock(&sbi->alloc_mutex);
1da177e4	167	sb->s_dirt = 0;
1da177e4	168
dd73a01a CH	169	vhdr->free_blocks = cpu_to_be32(sbi->free_blocks);
	170	vhdr->next_alloc = cpu_to_be32(sbi->next_alloc);
	171	vhdr->next_cnid = cpu_to_be32(sbi->next_cnid);
	172	vhdr->folder_count = cpu_to_be32(sbi->folder_count);
	173	vhdr->file_count = cpu_to_be32(sbi->file_count);
1da177e4	174
dd73a01a CH	175	mark_buffer_dirty(sbi->s_vhbh);
	176	if (sbi->flags & HFSPLUS_SB_WRITEBACKUP) {
	177	if (sbi->sect_count) {
1da177e4 LT	178	struct buffer_head *bh;
	179	u32 block, offset;
	180
dd73a01a CH	181	block = sbi->blockoffset;
	182	block += (sbi->sect_count - 2) >> (sb->s_blocksize_bits - 9);
	183	offset = ((sbi->sect_count - 2) << 9) & (sb->s_blocksize - 1);
	184	printk(KERN_DEBUG "hfs: backup: %u,%u,%u,%u\n",
	185	sbi->blockoffset, sbi->sect_count,
	186	block, offset);
1da177e4 LT	187	bh = sb_bread(sb, block);
	188	if (bh) {
	189	vhdr = (struct hfsplus_vh *)(bh->b_data + offset);
	190	if (be16_to_cpu(vhdr->signature) == HFSPLUS_VOLHEAD_SIG) {
dd73a01a	191	memcpy(vhdr, sbi->s_vhdr, sizeof(*vhdr));
1da177e4 LT	192	mark_buffer_dirty(bh);
	193	brelse(bh);
	194	} else
634725a9	195	printk(KERN_WARNING "hfs: backup not found!\n");
1da177e4 LT	196	}
1da177e4 LT	197	}
dd73a01a	198	sbi->flags &= ~HFSPLUS_SB_WRITEBACKUP;
1da177e4	199	}
dd73a01a	200	mutex_unlock(&sbi->alloc_mutex);
7fbc6df0 CH	201	return 0;
	202	}
	203
	204	static void hfsplus_write_super(struct super_block *sb)
	205	{
	206	if (!(sb->s_flags & MS_RDONLY))
	207	hfsplus_sync_fs(sb, 1);
	208	else
	209	sb->s_dirt = 0;
1da177e4 LT	210	}
	211
	212	static void hfsplus_put_super(struct super_block *sb)
	213	{
dd73a01a CH	214	struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
dd73a01a CH	215
1da177e4	216	dprint(DBG_SUPER, "hfsplus_put_super\n");
dd73a01a	217
945b0920 CL	218	if (!sb->s_fs_info)
945b0920 CL	219	return;
6cfd0148	220
8c85e125 CH	221	if (sb->s_dirt)
8c85e125 CH	222	hfsplus_write_super(sb);
dd73a01a CH	223	if (!(sb->s_flags & MS_RDONLY) && sbi->s_vhdr) {
dd73a01a CH	224	struct hfsplus_vh *vhdr = sbi->s_vhdr;
1da177e4 LT	225
	226	vhdr->modify_date = hfsp_now2mt();
	227	vhdr->attributes \|= cpu_to_be32(HFSPLUS_VOL_UNMNT);
	228	vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
dd73a01a CH	229	mark_buffer_dirty(sbi->s_vhbh);
dd73a01a CH	230	sync_dirty_buffer(sbi->s_vhbh);
1da177e4 LT	231	}
1da177e4 LT	232
dd73a01a CH	233	hfs_btree_close(sbi->cat_tree);
	234	hfs_btree_close(sbi->ext_tree);
	235	iput(sbi->alloc_file);
	236	iput(sbi->hidden_dir);
	237	brelse(sbi->s_vhbh);
	238	unload_nls(sbi->nls);
945b0920 CL	239	kfree(sb->s_fs_info);
945b0920 CL	240	sb->s_fs_info = NULL;
1da177e4 LT	241	}
1da177e4 LT	242
726c3342	243	static int hfsplus_statfs(struct dentry dentry, struct kstatfs buf)
1da177e4	244	{
726c3342	245	struct super_block *sb = dentry->d_sb;
dd73a01a	246	struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
25564dd8	247	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
726c3342	248
1da177e4 LT	249	buf->f_type = HFSPLUS_SUPER_MAGIC;
1da177e4 LT	250	buf->f_bsize = sb->s_blocksize;
dd73a01a CH	251	buf->f_blocks = sbi->total_blocks << sbi->fs_shift;
dd73a01a CH	252	buf->f_bfree = sbi->free_blocks << sbi->fs_shift;
1da177e4 LT	253	buf->f_bavail = buf->f_bfree;
1da177e4 LT	254	buf->f_files = 0xFFFFFFFF;
dd73a01a	255	buf->f_ffree = 0xFFFFFFFF - sbi->next_cnid;
25564dd8 CL	256	buf->f_fsid.val[0] = (u32)id;
25564dd8 CL	257	buf->f_fsid.val[1] = (u32)(id >> 32);
1da177e4 LT	258	buf->f_namelen = HFSPLUS_MAX_STRLEN;
	259
	260	return 0;
	261	}
	262
	263	static int hfsplus_remount(struct super_block sb, int flags, char *data)
	264	{
	265	if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
	266	return 0;
	267	if (!(*flags & MS_RDONLY)) {
dd73a01a	268	struct hfsplus_vh *vhdr = HFSPLUS_SB(sb)->s_vhdr;
b0b623c3 RZ	269	struct hfsplus_sb_info sbi;
	270
	271	memset(&sbi, 0, sizeof(struct hfsplus_sb_info));
dd73a01a	272	sbi.nls = HFSPLUS_SB(sb)->nls;
b0b623c3 RZ	273	if (!hfsplus_parse_options(data, &sbi))
b0b623c3 RZ	274	return -EINVAL;
1da177e4 LT	275
1da177e4 LT	276	if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
634725a9	277	printk(KERN_WARNING "hfs: filesystem was not cleanly unmounted, "
1da177e4 LT	278	"running fsck.hfsplus is recommended. leaving read-only.\n");
	279	sb->s_flags \|= MS_RDONLY;
	280	*flags \|= MS_RDONLY;
b0b623c3 RZ	281	} else if (sbi.flags & HFSPLUS_SB_FORCE) {
b0b623c3 RZ	282	/* nothing */
1da177e4	283	} else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
634725a9	284	printk(KERN_WARNING "hfs: filesystem is marked locked, leaving read-only.\n");
1da177e4 LT	285	sb->s_flags \|= MS_RDONLY;
1da177e4 LT	286	*flags \|= MS_RDONLY;
b0b623c3	287	} else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) {
634725a9	288	printk(KERN_WARNING "hfs: filesystem is marked journaled, leaving read-only.\n");
b0b623c3 RZ	289	sb->s_flags \|= MS_RDONLY;
b0b623c3 RZ	290	*flags \|= MS_RDONLY;
1da177e4 LT	291	}
	292	}
	293	return 0;
	294	}
	295
ee9b6d61	296	static const struct super_operations hfsplus_sops = {
1da177e4 LT	297	.alloc_inode = hfsplus_alloc_inode,
1da177e4 LT	298	.destroy_inode = hfsplus_destroy_inode,
1da177e4	299	.write_inode = hfsplus_write_inode,
b57922d9	300	.evict_inode = hfsplus_evict_inode,
1da177e4 LT	301	.put_super = hfsplus_put_super,
1da177e4 LT	302	.write_super = hfsplus_write_super,
7fbc6df0	303	.sync_fs = hfsplus_sync_fs,
1da177e4 LT	304	.statfs = hfsplus_statfs,
1da177e4 LT	305	.remount_fs = hfsplus_remount,
717dd80e	306	.show_options = hfsplus_show_options,
1da177e4 LT	307	};
	308
	309	static int hfsplus_fill_super(struct super_block sb, void data, int silent)
	310	{
	311	struct hfsplus_vh *vhdr;
	312	struct hfsplus_sb_info *sbi;
	313	hfsplus_cat_entry entry;
	314	struct hfs_find_data fd;
63525391	315	struct inode root, inode;
1da177e4 LT	316	struct qstr str;
	317	struct nls_table *nls = NULL;
	318	int err = -EINVAL;
	319
a5001a27	320	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1da177e4 LT	321	if (!sbi)
	322	return -ENOMEM;
	323
1da177e4 LT	324	sb->s_fs_info = sbi;
1da177e4 LT	325	INIT_HLIST_HEAD(&sbi->rsrc_inodes);
40bf48af	326	mutex_init(&sbi->alloc_mutex);
717dd80e RZ	327	hfsplus_fill_defaults(sbi);
717dd80e RZ	328	if (!hfsplus_parse_options(data, sbi)) {
634725a9	329	printk(KERN_ERR "hfs: unable to parse mount options\n");
1da177e4 LT	330	err = -EINVAL;
	331	goto cleanup;
	332	}
	333
	334	/* temporarily use utf8 to correctly find the hidden dir below */
	335	nls = sbi->nls;
	336	sbi->nls = load_nls("utf8");
bd6a59b2	337	if (!sbi->nls) {
634725a9	338	printk(KERN_ERR "hfs: unable to load nls for utf8\n");
1da177e4 LT	339	err = -EINVAL;
	340	goto cleanup;
	341	}
	342
	343	/* Grab the volume header */
	344	if (hfsplus_read_wrapper(sb)) {
	345	if (!silent)
634725a9	346	printk(KERN_WARNING "hfs: unable to find HFS+ superblock\n");
1da177e4 LT	347	err = -EINVAL;
	348	goto cleanup;
	349	}
dd73a01a	350	vhdr = sbi->s_vhdr;
1da177e4 LT	351
1da177e4 LT	352	/* Copy parts of the volume header into the superblock */
2179d372 DE	353	sb->s_magic = HFSPLUS_VOLHEAD_SIG;
	354	if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION \|\|
	355	be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) {
634725a9	356	printk(KERN_ERR "hfs: wrong filesystem version\n");
1da177e4 LT	357	goto cleanup;
1da177e4 LT	358	}
dd73a01a CH	359	sbi->total_blocks = be32_to_cpu(vhdr->total_blocks);
	360	sbi->free_blocks = be32_to_cpu(vhdr->free_blocks);
	361	sbi->next_alloc = be32_to_cpu(vhdr->next_alloc);
	362	sbi->next_cnid = be32_to_cpu(vhdr->next_cnid);
	363	sbi->file_count = be32_to_cpu(vhdr->file_count);
	364	sbi->folder_count = be32_to_cpu(vhdr->folder_count);
	365	sbi->data_clump_blocks =
	366	be32_to_cpu(vhdr->data_clump_sz) >> sbi->alloc_blksz_shift;
	367	if (!sbi->data_clump_blocks)
	368	sbi->data_clump_blocks = 1;
	369	sbi->rsrc_clump_blocks =
	370	be32_to_cpu(vhdr->rsrc_clump_sz) >> sbi->alloc_blksz_shift;
	371	if (!sbi->rsrc_clump_blocks)
	372	sbi->rsrc_clump_blocks = 1;
1da177e4 LT	373
	374	/* Set up operations so we can load metadata */
	375	sb->s_op = &hfsplus_sops;
	376	sb->s_maxbytes = MAX_LFS_FILESIZE;
	377
	378	if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
634725a9 RZ	379	printk(KERN_WARNING "hfs: Filesystem was not cleanly unmounted, "
634725a9 RZ	380	"running fsck.hfsplus is recommended. mounting read-only.\n");
1da177e4	381	sb->s_flags \|= MS_RDONLY;
b0b623c3 RZ	382	} else if (sbi->flags & HFSPLUS_SB_FORCE) {
b0b623c3 RZ	383	/* nothing */
1da177e4	384	} else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
634725a9	385	printk(KERN_WARNING "hfs: Filesystem is marked locked, mounting read-only.\n");
1da177e4	386	sb->s_flags \|= MS_RDONLY;
81a73719	387	} else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) && !(sb->s_flags & MS_RDONLY)) {
355a4696	388	printk(KERN_WARNING "hfs: write access to a journaled filesystem is not supported, "
634725a9	389	"use the force option at your own risk, mounting read-only.\n");
b0b623c3	390	sb->s_flags \|= MS_RDONLY;
1da177e4	391	}
b0b623c3	392	sbi->flags &= ~HFSPLUS_SB_FORCE;
1da177e4 LT	393
1da177e4 LT	394	/* Load metadata objects (BTrees) /
dd73a01a CH	395	sbi->ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
dd73a01a CH	396	if (!sbi->ext_tree) {
634725a9	397	printk(KERN_ERR "hfs: failed to load extents file\n");
1da177e4 LT	398	goto cleanup;
1da177e4 LT	399	}
dd73a01a CH	400	sbi->cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
dd73a01a CH	401	if (!sbi->cat_tree) {
634725a9	402	printk(KERN_ERR "hfs: failed to load catalog file\n");
1da177e4 LT	403	goto cleanup;
	404	}
	405
63525391 DH	406	inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID);
63525391 DH	407	if (IS_ERR(inode)) {
634725a9	408	printk(KERN_ERR "hfs: failed to load allocation file\n");
63525391	409	err = PTR_ERR(inode);
1da177e4 LT	410	goto cleanup;
1da177e4 LT	411	}
dd73a01a	412	sbi->alloc_file = inode;
1da177e4 LT	413
1da177e4 LT	414	/* Load the root directory */
63525391 DH	415	root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID);
	416	if (IS_ERR(root)) {
	417	printk(KERN_ERR "hfs: failed to load root directory\n");
	418	err = PTR_ERR(root);
	419	goto cleanup;
	420	}
1da177e4 LT	421	sb->s_root = d_alloc_root(root);
1da177e4 LT	422	if (!sb->s_root) {
1da177e4	423	iput(root);
63525391	424	err = -ENOMEM;
1da177e4 LT	425	goto cleanup;
1da177e4 LT	426	}
d45bce8f	427	sb->s_root->d_op = &hfsplus_dentry_operations;
1da177e4 LT	428
	429	str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
	430	str.name = HFSP_HIDDENDIR_NAME;
dd73a01a	431	hfs_find_init(sbi->cat_tree, &fd);
1da177e4 LT	432	hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
	433	if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
	434	hfs_find_exit(&fd);
	435	if (entry.type != cpu_to_be16(HFSPLUS_FOLDER))
	436	goto cleanup;
63525391 DH	437	inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id));
	438	if (IS_ERR(inode)) {
	439	err = PTR_ERR(inode);
1da177e4	440	goto cleanup;
63525391	441	}
dd73a01a	442	sbi->hidden_dir = inode;
1da177e4 LT	443	} else
	444	hfs_find_exit(&fd);
	445
	446	if (sb->s_flags & MS_RDONLY)
	447	goto out;
	448
	449	/* H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
	450	* all three are registered with Apple for our use
	451	*/
	452	vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
	453	vhdr->modify_date = hfsp_now2mt();
20c79e78	454	be32_add_cpu(&vhdr->write_count, 1);
1da177e4 LT	455	vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
1da177e4 LT	456	vhdr->attributes \|= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
dd73a01a CH	457	mark_buffer_dirty(sbi->s_vhbh);
dd73a01a CH	458	sync_dirty_buffer(sbi->s_vhbh);
1da177e4	459
dd73a01a	460	if (!sbi->hidden_dir) {
634725a9	461	printk(KERN_DEBUG "hfs: create hidden dir...\n");
dd73a01a CH	462	sbi->hidden_dir = hfsplus_new_inode(sb, S_IFDIR);
	463	hfsplus_create_cat(sbi->hidden_dir->i_ino, sb->s_root->d_inode,
	464	&str, sbi->hidden_dir);
	465	mark_inode_dirty(sbi->hidden_dir);
1da177e4 LT	466	}
	467	out:
	468	unload_nls(sbi->nls);
	469	sbi->nls = nls;
	470	return 0;
	471
	472	cleanup:
	473	hfsplus_put_super(sb);
6d729e44	474	unload_nls(nls);
1da177e4 LT	475	return err;
	476	}
	477
	478	MODULE_AUTHOR("Brad Boyer");
	479	MODULE_DESCRIPTION("Extended Macintosh Filesystem");
	480	MODULE_LICENSE("GPL");
	481
e18b890b	482	static struct kmem_cache *hfsplus_inode_cachep;
1da177e4 LT	483
	484	static struct inode hfsplus_alloc_inode(struct super_block sb)
	485	{
	486	struct hfsplus_inode_info *i;
	487
e94b1766	488	i = kmem_cache_alloc(hfsplus_inode_cachep, GFP_KERNEL);
1da177e4 LT	489	return i ? &i->vfs_inode : NULL;
	490	}
	491
	492	static void hfsplus_destroy_inode(struct inode *inode)
	493	{
6af502de	494	kmem_cache_free(hfsplus_inode_cachep, HFSPLUS_I(inode));
1da177e4 LT	495	}
	496
	497	#define HFSPLUS_INODE_SIZE sizeof(struct hfsplus_inode_info)
	498
454e2398 DH	499	static int hfsplus_get_sb(struct file_system_type *fs_type,
	500	int flags, const char dev_name, void data,
	501	struct vfsmount *mnt)
1da177e4	502	{
454e2398 DH	503	return get_sb_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super,
454e2398 DH	504	mnt);
1da177e4 LT	505	}
	506
	507	static struct file_system_type hfsplus_fs_type = {
	508	.owner = THIS_MODULE,
	509	.name = "hfsplus",
	510	.get_sb = hfsplus_get_sb,
	511	.kill_sb = kill_block_super,
	512	.fs_flags = FS_REQUIRES_DEV,
	513	};
	514
51cc5068	515	static void hfsplus_init_once(void *p)
1da177e4 LT	516	{
	517	struct hfsplus_inode_info *i = p;
	518
a35afb83	519	inode_init_once(&i->vfs_inode);
1da177e4 LT	520	}
	521
	522	static int __init init_hfsplus_fs(void)
	523	{
	524	int err;
	525
	526	hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache",
	527	HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN,
20c2df83	528	hfsplus_init_once);
1da177e4 LT	529	if (!hfsplus_inode_cachep)
	530	return -ENOMEM;
	531	err = register_filesystem(&hfsplus_fs_type);
	532	if (err)
	533	kmem_cache_destroy(hfsplus_inode_cachep);
	534	return err;
	535	}
	536
	537	static void __exit exit_hfsplus_fs(void)
	538	{
	539	unregister_filesystem(&hfsplus_fs_type);
1a1d92c1	540	kmem_cache_destroy(hfsplus_inode_cachep);
1da177e4 LT	541	}
	542
	543	module_init(init_hfsplus_fs)
	544	module_exit(exit_hfsplus_fs)