[net-next-2.6.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 void hfsplus_write_super(struct super_block *sb)
{
	struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;

	dprint(DBG_SUPER, "hfsplus_write_super\n");
	sb->s_dirt = 0;
	if (sb->s_flags & MS_RDONLY)
		/* warn? */
		return;

	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;
	}
}

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