[deliverable/linux.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, int unused)
{
	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 = HFSPLUS_SB(inode->i_sb).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)) {
			HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
			inode->i_sb->s_dirt = 1;
		}
		hfsplus_inode_write_fork(inode, &vhdr->ext_file);
		hfs_btree_write(HFSPLUS_SB(inode->i_sb).ext_tree);
		break;
	case HFSPLUS_CAT_CNID:
		if (vhdr->cat_file.total_size != cpu_to_be64(inode->i_size)) {
			HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
			inode->i_sb->s_dirt = 1;
		}
		hfsplus_inode_write_fork(inode, &vhdr->cat_file);
		hfs_btree_write(HFSPLUS_SB(inode->i_sb).cat_tree);
		break;
	case HFSPLUS_ALLOC_CNID:
		if (vhdr->alloc_file.total_size != cpu_to_be64(inode->i_size)) {
			HFSPLUS_SB(inode->i_sb).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)) {
			HFSPLUS_SB(inode->i_sb).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)) {
			HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
			inode->i_sb->s_dirt = 1;
		}
		hfsplus_inode_write_fork(inode, &vhdr->attr_file);
		hfs_btree_write(HFSPLUS_SB(inode->i_sb).attr_tree);
		break;
	}
	return ret;
}

static void hfsplus_clear_inode(struct inode *inode)
{
	dprint(DBG_INODE, "hfsplus_clear_inode: %lu\n", inode->i_ino);
	if (HFSPLUS_IS_RSRC(inode)) {
		HFSPLUS_I(HFSPLUS_I(inode).rsrc_inode).rsrc_inode = NULL;
		iput(HFSPLUS_I(inode).rsrc_inode);
	}
}

static int hfsplus_sync_fs(struct super_block *sb, int wait)
{
	struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;

	dprint(DBG_SUPER, "hfsplus_write_super\n");

	lock_super(sb);
	sb->s_dirt = 0;

	vhdr->free_blocks = cpu_to_be32(HFSPLUS_SB(sb).free_blocks);
	vhdr->next_alloc = cpu_to_be32(HFSPLUS_SB(sb).next_alloc);
	vhdr->next_cnid = cpu_to_be32(HFSPLUS_SB(sb).next_cnid);
	vhdr->folder_count = cpu_to_be32(HFSPLUS_SB(sb).folder_count);
	vhdr->file_count = cpu_to_be32(HFSPLUS_SB(sb).file_count);

	mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
	if (HFSPLUS_SB(sb).flags & HFSPLUS_SB_WRITEBACKUP) {
		if (HFSPLUS_SB(sb).sect_count) {
			struct buffer_head *bh;
			u32 block, offset;

			block = HFSPLUS_SB(sb).blockoffset;
			block += (HFSPLUS_SB(sb).sect_count - 2) >> (sb->s_blocksize_bits - 9);
			offset = ((HFSPLUS_SB(sb).sect_count - 2) << 9) & (sb->s_blocksize - 1);
			printk(KERN_DEBUG "hfs: backup: %u,%u,%u,%u\n", HFSPLUS_SB(sb).blockoffset,
				HFSPLUS_SB(sb).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, HFSPLUS_SB(sb).s_vhdr, sizeof(*vhdr));
					mark_buffer_dirty(bh);
					brelse(bh);
				} else
					printk(KERN_WARNING "hfs: backup not found!\n");
			}
		}
		HFSPLUS_SB(sb).flags &= ~HFSPLUS_SB_WRITEBACKUP;
	}
	unlock_super(sb);
	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)
{
	dprint(DBG_SUPER, "hfsplus_put_super\n");
	if (!sb->s_fs_info)
		return;

	lock_kernel();

	if (sb->s_dirt)
		hfsplus_write_super(sb);
	if (!(sb->s_flags & MS_RDONLY) && HFSPLUS_SB(sb).s_vhdr) {
		struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).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(HFSPLUS_SB(sb).s_vhbh);
		sync_dirty_buffer(HFSPLUS_SB(sb).s_vhbh);
	}

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

	unlock_kernel();
}

static int hfsplus_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 = HFSPLUS_SUPER_MAGIC;
	buf->f_bsize = sb->s_blocksize;
	buf->f_blocks = HFSPLUS_SB(sb).total_blocks << HFSPLUS_SB(sb).fs_shift;
	buf->f_bfree = HFSPLUS_SB(sb).free_blocks << HFSPLUS_SB(sb).fs_shift;
	buf->f_bavail = buf->f_bfree;
	buf->f_files = 0xFFFFFFFF;
	buf->f_ffree = 0xFFFFFFFF - HFSPLUS_SB(sb).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,
	.clear_inode	= hfsplus_clear_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);
	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 = HFSPLUS_SB(sb).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;
	}
	HFSPLUS_SB(sb).total_blocks = be32_to_cpu(vhdr->total_blocks);
	HFSPLUS_SB(sb).free_blocks = be32_to_cpu(vhdr->free_blocks);
	HFSPLUS_SB(sb).next_alloc = be32_to_cpu(vhdr->next_alloc);
	HFSPLUS_SB(sb).next_cnid = be32_to_cpu(vhdr->next_cnid);
	HFSPLUS_SB(sb).file_count = be32_to_cpu(vhdr->file_count);
	HFSPLUS_SB(sb).folder_count = be32_to_cpu(vhdr->folder_count);
	HFSPLUS_SB(sb).data_clump_blocks = be32_to_cpu(vhdr->data_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
	if (!HFSPLUS_SB(sb).data_clump_blocks)
		HFSPLUS_SB(sb).data_clump_blocks = 1;
	HFSPLUS_SB(sb).rsrc_clump_blocks = be32_to_cpu(vhdr->rsrc_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
	if (!HFSPLUS_SB(sb).rsrc_clump_blocks)
		HFSPLUS_SB(sb).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) */
	HFSPLUS_SB(sb).ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
	if (!HFSPLUS_SB(sb).ext_tree) {
		printk(KERN_ERR "hfs: failed to load extents file\n");
		goto cleanup;
	}
	HFSPLUS_SB(sb).cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
	if (!HFSPLUS_SB(sb).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;
	}
	HFSPLUS_SB(sb).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(HFSPLUS_SB(sb).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;
		}
		HFSPLUS_SB(sb).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(HFSPLUS_SB(sb).s_vhbh);
	sync_dirty_buffer(HFSPLUS_SB(sb).s_vhbh);

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

cleanup:
	hfsplus_put_super(sb);
	if (nls)
		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
1da177e4	36	INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list);
895c23f8	37	mutex_init(&HFSPLUS_I(inode).extents_lock);
1da177e4 LT	38	HFSPLUS_I(inode).flags = 0;
1da177e4 LT	39	HFSPLUS_I(inode).rsrc_inode = NULL;
94c1d318	40	atomic_set(&HFSPLUS_I(inode).opencnt, 0);
1da177e4 LT	41
	42	if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
	43	read_inode:
	44	hfs_find_init(HFSPLUS_SB(inode->i_sb).cat_tree, &fd);
	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 LT	52	}
	53	vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr;
	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	}
	88
	89	static int hfsplus_write_inode(struct inode *inode, int unused)
	90	{
	91	struct hfsplus_vh *vhdr;
	92	int ret = 0;
	93
	94	dprint(DBG_INODE, "hfsplus_write_inode: %lu\n", inode->i_ino);
	95	hfsplus_ext_write_extent(inode);
	96	if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
	97	return hfsplus_cat_write_inode(inode);
	98	}
	99	vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr;
	100	switch (inode->i_ino) {
	101	case HFSPLUS_ROOT_CNID:
	102	ret = hfsplus_cat_write_inode(inode);
	103	break;
	104	case HFSPLUS_EXT_CNID:
	105	if (vhdr->ext_file.total_size != cpu_to_be64(inode->i_size)) {
	106	HFSPLUS_SB(inode->i_sb).flags \|= HFSPLUS_SB_WRITEBACKUP;
	107	inode->i_sb->s_dirt = 1;
	108	}
	109	hfsplus_inode_write_fork(inode, &vhdr->ext_file);
	110	hfs_btree_write(HFSPLUS_SB(inode->i_sb).ext_tree);
	111	break;
	112	case HFSPLUS_CAT_CNID:
	113	if (vhdr->cat_file.total_size != cpu_to_be64(inode->i_size)) {
	114	HFSPLUS_SB(inode->i_sb).flags \|= HFSPLUS_SB_WRITEBACKUP;
	115	inode->i_sb->s_dirt = 1;
	116	}
	117	hfsplus_inode_write_fork(inode, &vhdr->cat_file);
	118	hfs_btree_write(HFSPLUS_SB(inode->i_sb).cat_tree);
	119	break;
	120	case HFSPLUS_ALLOC_CNID:
	121	if (vhdr->alloc_file.total_size != cpu_to_be64(inode->i_size)) {
	122	HFSPLUS_SB(inode->i_sb).flags \|= HFSPLUS_SB_WRITEBACKUP;
	123	inode->i_sb->s_dirt = 1;
	124	}
	125	hfsplus_inode_write_fork(inode, &vhdr->alloc_file);
	126	break;
	127	case HFSPLUS_START_CNID:
	128	if (vhdr->start_file.total_size != cpu_to_be64(inode->i_size)) {
	129	HFSPLUS_SB(inode->i_sb).flags \|= HFSPLUS_SB_WRITEBACKUP;
	130	inode->i_sb->s_dirt = 1;
	131	}
	132	hfsplus_inode_write_fork(inode, &vhdr->start_file);
	133	break;
	134	case HFSPLUS_ATTR_CNID:
	135	if (vhdr->attr_file.total_size != cpu_to_be64(inode->i_size)) {
	136	HFSPLUS_SB(inode->i_sb).flags \|= HFSPLUS_SB_WRITEBACKUP;
	137	inode->i_sb->s_dirt = 1;
	138	}
	139	hfsplus_inode_write_fork(inode, &vhdr->attr_file);
	140	hfs_btree_write(HFSPLUS_SB(inode->i_sb).attr_tree);
	141	break;
	142	}
	143	return ret;
	144	}
	145
	146	static void hfsplus_clear_inode(struct inode *inode)
	147	{
	148	dprint(DBG_INODE, "hfsplus_clear_inode: %lu\n", inode->i_ino);
1da177e4 LT	149	if (HFSPLUS_IS_RSRC(inode)) {
	150	HFSPLUS_I(HFSPLUS_I(inode).rsrc_inode).rsrc_inode = NULL;
	151	iput(HFSPLUS_I(inode).rsrc_inode);
	152	}
1da177e4 LT	153	}
1da177e4 LT	154
7fbc6df0	155	static int hfsplus_sync_fs(struct super_block *sb, int wait)
1da177e4 LT	156	{
	157	struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
	158
	159	dprint(DBG_SUPER, "hfsplus_write_super\n");
ebc1ac16 CH	160
ebc1ac16 CH	161	lock_super(sb);
1da177e4	162	sb->s_dirt = 0;
1da177e4 LT	163
	164	vhdr->free_blocks = cpu_to_be32(HFSPLUS_SB(sb).free_blocks);
	165	vhdr->next_alloc = cpu_to_be32(HFSPLUS_SB(sb).next_alloc);
	166	vhdr->next_cnid = cpu_to_be32(HFSPLUS_SB(sb).next_cnid);
	167	vhdr->folder_count = cpu_to_be32(HFSPLUS_SB(sb).folder_count);
	168	vhdr->file_count = cpu_to_be32(HFSPLUS_SB(sb).file_count);
	169
	170	mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
	171	if (HFSPLUS_SB(sb).flags & HFSPLUS_SB_WRITEBACKUP) {
	172	if (HFSPLUS_SB(sb).sect_count) {
	173	struct buffer_head *bh;
	174	u32 block, offset;
	175
	176	block = HFSPLUS_SB(sb).blockoffset;
	177	block += (HFSPLUS_SB(sb).sect_count - 2) >> (sb->s_blocksize_bits - 9);
	178	offset = ((HFSPLUS_SB(sb).sect_count - 2) << 9) & (sb->s_blocksize - 1);
634725a9	179	printk(KERN_DEBUG "hfs: backup: %u,%u,%u,%u\n", HFSPLUS_SB(sb).blockoffset,
1da177e4 LT	180	HFSPLUS_SB(sb).sect_count, block, offset);
	181	bh = sb_bread(sb, block);
	182	if (bh) {
	183	vhdr = (struct hfsplus_vh *)(bh->b_data + offset);
	184	if (be16_to_cpu(vhdr->signature) == HFSPLUS_VOLHEAD_SIG) {
	185	memcpy(vhdr, HFSPLUS_SB(sb).s_vhdr, sizeof(*vhdr));
	186	mark_buffer_dirty(bh);
	187	brelse(bh);
	188	} else
634725a9	189	printk(KERN_WARNING "hfs: backup not found!\n");
1da177e4 LT	190	}
	191	}
	192	HFSPLUS_SB(sb).flags &= ~HFSPLUS_SB_WRITEBACKUP;
	193	}
ebc1ac16	194	unlock_super(sb);
7fbc6df0 CH	195	return 0;
	196	}
	197
	198	static void hfsplus_write_super(struct super_block *sb)
	199	{
	200	if (!(sb->s_flags & MS_RDONLY))
	201	hfsplus_sync_fs(sb, 1);
	202	else
	203	sb->s_dirt = 0;
1da177e4 LT	204	}
	205
	206	static void hfsplus_put_super(struct super_block *sb)
	207	{
	208	dprint(DBG_SUPER, "hfsplus_put_super\n");
945b0920 CL	209	if (!sb->s_fs_info)
945b0920 CL	210	return;
6cfd0148 CH	211
	212	lock_kernel();
	213
8c85e125 CH	214	if (sb->s_dirt)
8c85e125 CH	215	hfsplus_write_super(sb);
945b0920	216	if (!(sb->s_flags & MS_RDONLY) && HFSPLUS_SB(sb).s_vhdr) {
1da177e4 LT	217	struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
	218
	219	vhdr->modify_date = hfsp_now2mt();
	220	vhdr->attributes \|= cpu_to_be32(HFSPLUS_VOL_UNMNT);
	221	vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
	222	mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
e39f07c8	223	sync_dirty_buffer(HFSPLUS_SB(sb).s_vhbh);
1da177e4 LT	224	}
	225
	226	hfs_btree_close(HFSPLUS_SB(sb).cat_tree);
	227	hfs_btree_close(HFSPLUS_SB(sb).ext_tree);
	228	iput(HFSPLUS_SB(sb).alloc_file);
	229	iput(HFSPLUS_SB(sb).hidden_dir);
	230	brelse(HFSPLUS_SB(sb).s_vhbh);
	231	if (HFSPLUS_SB(sb).nls)
	232	unload_nls(HFSPLUS_SB(sb).nls);
945b0920 CL	233	kfree(sb->s_fs_info);
945b0920 CL	234	sb->s_fs_info = NULL;
6cfd0148 CH	235
6cfd0148 CH	236	unlock_kernel();
1da177e4 LT	237	}
1da177e4 LT	238
726c3342	239	static int hfsplus_statfs(struct dentry dentry, struct kstatfs buf)
1da177e4	240	{
726c3342	241	struct super_block *sb = dentry->d_sb;
25564dd8	242	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
726c3342	243
1da177e4 LT	244	buf->f_type = HFSPLUS_SUPER_MAGIC;
	245	buf->f_bsize = sb->s_blocksize;
	246	buf->f_blocks = HFSPLUS_SB(sb).total_blocks << HFSPLUS_SB(sb).fs_shift;
	247	buf->f_bfree = HFSPLUS_SB(sb).free_blocks << HFSPLUS_SB(sb).fs_shift;
	248	buf->f_bavail = buf->f_bfree;
	249	buf->f_files = 0xFFFFFFFF;
	250	buf->f_ffree = 0xFFFFFFFF - HFSPLUS_SB(sb).next_cnid;
25564dd8 CL	251	buf->f_fsid.val[0] = (u32)id;
25564dd8 CL	252	buf->f_fsid.val[1] = (u32)(id >> 32);
1da177e4 LT	253	buf->f_namelen = HFSPLUS_MAX_STRLEN;
	254
	255	return 0;
	256	}
	257
	258	static int hfsplus_remount(struct super_block sb, int flags, char *data)
	259	{
	260	if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
	261	return 0;
	262	if (!(*flags & MS_RDONLY)) {
	263	struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
b0b623c3 RZ	264	struct hfsplus_sb_info sbi;
	265
	266	memset(&sbi, 0, sizeof(struct hfsplus_sb_info));
	267	sbi.nls = HFSPLUS_SB(sb).nls;
	268	if (!hfsplus_parse_options(data, &sbi))
	269	return -EINVAL;
1da177e4 LT	270
1da177e4 LT	271	if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
634725a9	272	printk(KERN_WARNING "hfs: filesystem was not cleanly unmounted, "
1da177e4 LT	273	"running fsck.hfsplus is recommended. leaving read-only.\n");
	274	sb->s_flags \|= MS_RDONLY;
	275	*flags \|= MS_RDONLY;
b0b623c3 RZ	276	} else if (sbi.flags & HFSPLUS_SB_FORCE) {
b0b623c3 RZ	277	/* nothing */
1da177e4	278	} else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
634725a9	279	printk(KERN_WARNING "hfs: filesystem is marked locked, leaving read-only.\n");
1da177e4 LT	280	sb->s_flags \|= MS_RDONLY;
1da177e4 LT	281	*flags \|= MS_RDONLY;
b0b623c3	282	} else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) {
634725a9	283	printk(KERN_WARNING "hfs: filesystem is marked journaled, leaving read-only.\n");
b0b623c3 RZ	284	sb->s_flags \|= MS_RDONLY;
b0b623c3 RZ	285	*flags \|= MS_RDONLY;
1da177e4 LT	286	}
	287	}
	288	return 0;
	289	}
	290
ee9b6d61	291	static const struct super_operations hfsplus_sops = {
1da177e4 LT	292	.alloc_inode = hfsplus_alloc_inode,
1da177e4 LT	293	.destroy_inode = hfsplus_destroy_inode,
1da177e4 LT	294	.write_inode = hfsplus_write_inode,
	295	.clear_inode = hfsplus_clear_inode,
	296	.put_super = hfsplus_put_super,
	297	.write_super = hfsplus_write_super,
7fbc6df0	298	.sync_fs = hfsplus_sync_fs,
1da177e4 LT	299	.statfs = hfsplus_statfs,
1da177e4 LT	300	.remount_fs = hfsplus_remount,
717dd80e	301	.show_options = hfsplus_show_options,
1da177e4 LT	302	};
	303
	304	static int hfsplus_fill_super(struct super_block sb, void data, int silent)
	305	{
	306	struct hfsplus_vh *vhdr;
	307	struct hfsplus_sb_info *sbi;
	308	hfsplus_cat_entry entry;
	309	struct hfs_find_data fd;
63525391	310	struct inode root, inode;
1da177e4 LT	311	struct qstr str;
	312	struct nls_table *nls = NULL;
	313	int err = -EINVAL;
	314
a5001a27	315	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1da177e4 LT	316	if (!sbi)
	317	return -ENOMEM;
	318
1da177e4 LT	319	sb->s_fs_info = sbi;
1da177e4 LT	320	INIT_HLIST_HEAD(&sbi->rsrc_inodes);
717dd80e RZ	321	hfsplus_fill_defaults(sbi);
717dd80e RZ	322	if (!hfsplus_parse_options(data, sbi)) {
634725a9	323	printk(KERN_ERR "hfs: unable to parse mount options\n");
1da177e4 LT	324	err = -EINVAL;
	325	goto cleanup;
	326	}
	327
	328	/* temporarily use utf8 to correctly find the hidden dir below */
	329	nls = sbi->nls;
	330	sbi->nls = load_nls("utf8");
bd6a59b2	331	if (!sbi->nls) {
634725a9	332	printk(KERN_ERR "hfs: unable to load nls for utf8\n");
1da177e4 LT	333	err = -EINVAL;
	334	goto cleanup;
	335	}
	336
	337	/* Grab the volume header */
	338	if (hfsplus_read_wrapper(sb)) {
	339	if (!silent)
634725a9	340	printk(KERN_WARNING "hfs: unable to find HFS+ superblock\n");
1da177e4 LT	341	err = -EINVAL;
	342	goto cleanup;
	343	}
	344	vhdr = HFSPLUS_SB(sb).s_vhdr;
	345
	346	/* Copy parts of the volume header into the superblock */
2179d372 DE	347	sb->s_magic = HFSPLUS_VOLHEAD_SIG;
	348	if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION \|\|
	349	be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) {
634725a9	350	printk(KERN_ERR "hfs: wrong filesystem version\n");
1da177e4 LT	351	goto cleanup;
	352	}
	353	HFSPLUS_SB(sb).total_blocks = be32_to_cpu(vhdr->total_blocks);
	354	HFSPLUS_SB(sb).free_blocks = be32_to_cpu(vhdr->free_blocks);
	355	HFSPLUS_SB(sb).next_alloc = be32_to_cpu(vhdr->next_alloc);
	356	HFSPLUS_SB(sb).next_cnid = be32_to_cpu(vhdr->next_cnid);
	357	HFSPLUS_SB(sb).file_count = be32_to_cpu(vhdr->file_count);
	358	HFSPLUS_SB(sb).folder_count = be32_to_cpu(vhdr->folder_count);
	359	HFSPLUS_SB(sb).data_clump_blocks = be32_to_cpu(vhdr->data_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
	360	if (!HFSPLUS_SB(sb).data_clump_blocks)
	361	HFSPLUS_SB(sb).data_clump_blocks = 1;
	362	HFSPLUS_SB(sb).rsrc_clump_blocks = be32_to_cpu(vhdr->rsrc_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
	363	if (!HFSPLUS_SB(sb).rsrc_clump_blocks)
	364	HFSPLUS_SB(sb).rsrc_clump_blocks = 1;
	365
	366	/* Set up operations so we can load metadata */
	367	sb->s_op = &hfsplus_sops;
	368	sb->s_maxbytes = MAX_LFS_FILESIZE;
	369
	370	if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
634725a9 RZ	371	printk(KERN_WARNING "hfs: Filesystem was not cleanly unmounted, "
634725a9 RZ	372	"running fsck.hfsplus is recommended. mounting read-only.\n");
1da177e4	373	sb->s_flags \|= MS_RDONLY;
b0b623c3 RZ	374	} else if (sbi->flags & HFSPLUS_SB_FORCE) {
b0b623c3 RZ	375	/* nothing */
1da177e4	376	} else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
634725a9	377	printk(KERN_WARNING "hfs: Filesystem is marked locked, mounting read-only.\n");
1da177e4	378	sb->s_flags \|= MS_RDONLY;
81a73719	379	} else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) && !(sb->s_flags & MS_RDONLY)) {
355a4696	380	printk(KERN_WARNING "hfs: write access to a journaled filesystem is not supported, "
634725a9	381	"use the force option at your own risk, mounting read-only.\n");
b0b623c3	382	sb->s_flags \|= MS_RDONLY;
1da177e4	383	}
b0b623c3	384	sbi->flags &= ~HFSPLUS_SB_FORCE;
1da177e4 LT	385
	386	/* Load metadata objects (BTrees) /
	387	HFSPLUS_SB(sb).ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
	388	if (!HFSPLUS_SB(sb).ext_tree) {
634725a9	389	printk(KERN_ERR "hfs: failed to load extents file\n");
1da177e4 LT	390	goto cleanup;
	391	}
	392	HFSPLUS_SB(sb).cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
	393	if (!HFSPLUS_SB(sb).cat_tree) {
634725a9	394	printk(KERN_ERR "hfs: failed to load catalog file\n");
1da177e4 LT	395	goto cleanup;
	396	}
	397
63525391 DH	398	inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID);
63525391 DH	399	if (IS_ERR(inode)) {
634725a9	400	printk(KERN_ERR "hfs: failed to load allocation file\n");
63525391	401	err = PTR_ERR(inode);
1da177e4 LT	402	goto cleanup;
1da177e4 LT	403	}
63525391	404	HFSPLUS_SB(sb).alloc_file = inode;
1da177e4 LT	405
1da177e4 LT	406	/* Load the root directory */
63525391 DH	407	root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID);
	408	if (IS_ERR(root)) {
	409	printk(KERN_ERR "hfs: failed to load root directory\n");
	410	err = PTR_ERR(root);
	411	goto cleanup;
	412	}
1da177e4 LT	413	sb->s_root = d_alloc_root(root);
1da177e4 LT	414	if (!sb->s_root) {
1da177e4	415	iput(root);
63525391	416	err = -ENOMEM;
1da177e4 LT	417	goto cleanup;
1da177e4 LT	418	}
d45bce8f	419	sb->s_root->d_op = &hfsplus_dentry_operations;
1da177e4 LT	420
	421	str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
	422	str.name = HFSP_HIDDENDIR_NAME;
	423	hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
	424	hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
	425	if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
	426	hfs_find_exit(&fd);
	427	if (entry.type != cpu_to_be16(HFSPLUS_FOLDER))
	428	goto cleanup;
63525391 DH	429	inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id));
	430	if (IS_ERR(inode)) {
	431	err = PTR_ERR(inode);
1da177e4	432	goto cleanup;
63525391 DH	433	}
63525391 DH	434	HFSPLUS_SB(sb).hidden_dir = inode;
1da177e4 LT	435	} else
	436	hfs_find_exit(&fd);
	437
	438	if (sb->s_flags & MS_RDONLY)
	439	goto out;
	440
	441	/* H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
	442	* all three are registered with Apple for our use
	443	*/
	444	vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
	445	vhdr->modify_date = hfsp_now2mt();
20c79e78	446	be32_add_cpu(&vhdr->write_count, 1);
1da177e4 LT	447	vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
	448	vhdr->attributes \|= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
	449	mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
e39f07c8	450	sync_dirty_buffer(HFSPLUS_SB(sb).s_vhbh);
1da177e4 LT	451
1da177e4 LT	452	if (!HFSPLUS_SB(sb).hidden_dir) {
634725a9	453	printk(KERN_DEBUG "hfs: create hidden dir...\n");
1da177e4 LT	454	HFSPLUS_SB(sb).hidden_dir = hfsplus_new_inode(sb, S_IFDIR);
	455	hfsplus_create_cat(HFSPLUS_SB(sb).hidden_dir->i_ino, sb->s_root->d_inode,
	456	&str, HFSPLUS_SB(sb).hidden_dir);
	457	mark_inode_dirty(HFSPLUS_SB(sb).hidden_dir);
	458	}
	459	out:
	460	unload_nls(sbi->nls);
	461	sbi->nls = nls;
	462	return 0;
	463
	464	cleanup:
	465	hfsplus_put_super(sb);
	466	if (nls)
	467	unload_nls(nls);
	468	return err;
	469	}
	470
	471	MODULE_AUTHOR("Brad Boyer");
	472	MODULE_DESCRIPTION("Extended Macintosh Filesystem");
	473	MODULE_LICENSE("GPL");
	474
e18b890b	475	static struct kmem_cache *hfsplus_inode_cachep;
1da177e4 LT	476
	477	static struct inode hfsplus_alloc_inode(struct super_block sb)
	478	{
	479	struct hfsplus_inode_info *i;
	480
e94b1766	481	i = kmem_cache_alloc(hfsplus_inode_cachep, GFP_KERNEL);
1da177e4 LT	482	return i ? &i->vfs_inode : NULL;
	483	}
	484
	485	static void hfsplus_destroy_inode(struct inode *inode)
	486	{
	487	kmem_cache_free(hfsplus_inode_cachep, &HFSPLUS_I(inode));
	488	}
	489
	490	#define HFSPLUS_INODE_SIZE sizeof(struct hfsplus_inode_info)
	491
454e2398 DH	492	static int hfsplus_get_sb(struct file_system_type *fs_type,
	493	int flags, const char dev_name, void data,
	494	struct vfsmount *mnt)
1da177e4	495	{
454e2398 DH	496	return get_sb_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super,
454e2398 DH	497	mnt);
1da177e4 LT	498	}
	499
	500	static struct file_system_type hfsplus_fs_type = {
	501	.owner = THIS_MODULE,
	502	.name = "hfsplus",
	503	.get_sb = hfsplus_get_sb,
	504	.kill_sb = kill_block_super,
	505	.fs_flags = FS_REQUIRES_DEV,
	506	};
	507
51cc5068	508	static void hfsplus_init_once(void *p)
1da177e4 LT	509	{
	510	struct hfsplus_inode_info *i = p;
	511
a35afb83	512	inode_init_once(&i->vfs_inode);
1da177e4 LT	513	}
	514
	515	static int __init init_hfsplus_fs(void)
	516	{
	517	int err;
	518
	519	hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache",
	520	HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN,
20c2df83	521	hfsplus_init_once);
1da177e4 LT	522	if (!hfsplus_inode_cachep)
	523	return -ENOMEM;
	524	err = register_filesystem(&hfsplus_fs_type);
	525	if (err)
	526	kmem_cache_destroy(hfsplus_inode_cachep);
	527	return err;
	528	}
	529
	530	static void __exit exit_hfsplus_fs(void)
	531	{
	532	unregister_filesystem(&hfsplus_fs_type);
1a1d92c1	533	kmem_cache_destroy(hfsplus_inode_cachep);
1da177e4 LT	534	}
	535
	536	module_init(init_hfsplus_fs)
	537	module_exit(exit_hfsplus_fs)