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

/*
 *  linux/fs/hfsplus/super.c
 *
 * Copyright (C) 2001
 * Brad Boyer ([email protected])
 * (C) 2003 Ardis Technologies <[email protected]>
 *
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/pagemap.h>
#include <linux/blkdev.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"

static int hfsplus_system_read_inode(struct inode *inode)
{
	struct hfsplus_vh *vhdr = HFSPLUS_SB(inode->i_sb)->s_vhdr;

	switch (inode->i_ino) {
	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:
		return -EIO;
	}

	return 0;
}

struct inode *hfsplus_iget(struct super_block *sb, unsigned long ino)
{
	struct hfs_find_data fd;
	struct inode *inode;
	int err;

	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)->extent_state = 0;
	HFSPLUS_I(inode)->rsrc_inode = NULL;
	atomic_set(&HFSPLUS_I(inode)->opencnt, 0);

	if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID ||
	    inode->i_ino == HFSPLUS_ROOT_CNID) {
		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);
	} else {
		err = hfsplus_system_read_inode(inode);
	}

	if (err) {
		iget_failed(inode);
		return ERR_PTR(err);
	}

	unlock_new_inode(inode);
	return inode;
}

static int hfsplus_system_write_inode(struct inode *inode)
{
	struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
	struct hfsplus_vh *vhdr = sbi->s_vhdr;
	struct hfsplus_fork_raw *fork;
	struct hfs_btree *tree = NULL;

	switch (inode->i_ino) {
	case HFSPLUS_EXT_CNID:
		fork = &vhdr->ext_file;
		tree = sbi->ext_tree;
		break;
	case HFSPLUS_CAT_CNID:
		fork = &vhdr->cat_file;
		tree = sbi->cat_tree;
		break;
	case HFSPLUS_ALLOC_CNID:
		fork = &vhdr->alloc_file;
		break;
	case HFSPLUS_START_CNID:
		fork = &vhdr->start_file;
		break;
	case HFSPLUS_ATTR_CNID:
		fork = &vhdr->attr_file;
		tree = sbi->attr_tree;
	default:
		return -EIO;
	}

	if (fork->total_size != cpu_to_be64(inode->i_size)) {
		set_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags);
		inode->i_sb->s_dirt = 1;
	}
	hfsplus_inode_write_fork(inode, fork);
	if (tree)
		hfs_btree_write(tree);
	return 0;
}

static int hfsplus_write_inode(struct inode *inode,
		struct writeback_control *wbc)
{
	dprint(DBG_INODE, "hfsplus_write_inode: %lu\n", inode->i_ino);

	hfsplus_ext_write_extent(inode);

	if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID ||
	    inode->i_ino == HFSPLUS_ROOT_CNID)
		return hfsplus_cat_write_inode(inode);
	else
		return hfsplus_system_write_inode(inode);
}

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;
	int write_backup = 0;
	int error, error2;

	if (!wait)
		return 0;

	dprint(DBG_SUPER, "hfsplus_write_super\n");

	sb->s_dirt = 0;

	/*
	 * Explicitly write out the special metadata inodes.
	 *
	 * While these special inodes are marked as hashed and written
	 * out peridocically by the flusher threads we redirty them
	 * during writeout of normal inodes, and thus the life lock
	 * prevents us from getting the latest state to disk.
	 */
	error = filemap_write_and_wait(sbi->cat_tree->inode->i_mapping);
	error2 = filemap_write_and_wait(sbi->ext_tree->inode->i_mapping);
	if (!error)
		error = error2;
	error2 = filemap_write_and_wait(sbi->alloc_file->i_mapping);
	if (!error)
		error = error2;

	mutex_lock(&sbi->vh_mutex);
	mutex_lock(&sbi->alloc_mutex);
	vhdr->free_blocks = cpu_to_be32(sbi->free_blocks);
	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);

	if (test_and_clear_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags)) {
		memcpy(sbi->s_backup_vhdr, sbi->s_vhdr, sizeof(*sbi->s_vhdr));
		write_backup = 1;
	}

	error2 = hfsplus_submit_bio(sb->s_bdev,
				   sbi->part_start + HFSPLUS_VOLHEAD_SECTOR,
				   sbi->s_vhdr, WRITE_SYNC);
	if (!error)
		error = error2;
	if (!write_backup)
		goto out;

	error2 = hfsplus_submit_bio(sb->s_bdev,
				  sbi->part_start + sbi->sect_count - 2,
				  sbi->s_backup_vhdr, WRITE_SYNC);
	if (!error)
		error2 = error;
out:
	mutex_unlock(&sbi->alloc_mutex);
	mutex_unlock(&sbi->vh_mutex);

	if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))
		blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);

	return error;
}

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_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);

		hfsplus_sync_fs(sb, 1);
	}

	hfs_btree_close(sbi->cat_tree);
	hfs_btree_close(sbi->ext_tree);
	iput(sbi->alloc_file);
	iput(sbi->hidden_dir);
	kfree(sbi->s_vhdr);
	kfree(sbi->s_backup_vhdr);
	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;
		int force = 0;

		if (!hfsplus_parse_options_remount(data, &force))
			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 (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;

	err = -EINVAL;
	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
	if (!sbi)
		goto out;

	sb->s_fs_info = sbi;
	mutex_init(&sbi->alloc_mutex);
	mutex_init(&sbi->vh_mutex);
	hfsplus_fill_defaults(sbi);

	err = -EINVAL;
	if (!hfsplus_parse_options(data, sbi)) {
		printk(KERN_ERR "hfs: unable to parse mount options\n");
		goto out_unload_nls;
	}

	/* 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");
		goto out_unload_nls;
	}

	/* Grab the volume header */
	if (hfsplus_read_wrapper(sb)) {
		if (!silent)
			printk(KERN_WARNING "hfs: unable to find HFS+ superblock\n");
		goto out_unload_nls;
	}
	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 out_free_vhdr;
	}
	sbi->total_blocks = be32_to_cpu(vhdr->total_blocks);
	sbi->free_blocks = be32_to_cpu(vhdr->free_blocks);
	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 (test_and_clear_bit(HFSPLUS_SB_FORCE, &sbi->flags)) {
		/* 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;
	}

	/* 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 out_free_vhdr;
	}
	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 out_close_ext_tree;
	}

	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 out_close_cat_tree;
	}
	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 out_put_alloc_file;
	}

	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 out_put_root;
		inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id));
		if (IS_ERR(inode)) {
			err = PTR_ERR(inode);
			goto out_put_root;
		}
		sbi->hidden_dir = inode;
	} else
		hfs_find_exit(&fd);

	if (!(sb->s_flags & MS_RDONLY)) {
		/*
		 * 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);
		hfsplus_sync_fs(sb, 1);

		if (!sbi->hidden_dir) {
			mutex_lock(&sbi->vh_mutex);
			sbi->hidden_dir = hfsplus_new_inode(sb, S_IFDIR);
			hfsplus_create_cat(sbi->hidden_dir->i_ino, root, &str,
					   sbi->hidden_dir);
			mutex_unlock(&sbi->vh_mutex);

			hfsplus_mark_inode_dirty(sbi->hidden_dir,
						 HFSPLUS_I_CAT_DIRTY);
		}
	}

	sb->s_d_op = &hfsplus_dentry_operations;
	sb->s_root = d_alloc_root(root);
	if (!sb->s_root) {
		err = -ENOMEM;
		goto out_put_hidden_dir;
	}

	unload_nls(sbi->nls);
	sbi->nls = nls;
	return 0;

out_put_hidden_dir:
	iput(sbi->hidden_dir);
out_put_root:
	iput(sbi->alloc_file);
out_put_alloc_file:
	iput(sbi->alloc_file);
out_close_cat_tree:
	hfs_btree_close(sbi->cat_tree);
out_close_ext_tree:
	hfs_btree_close(sbi->ext_tree);
out_free_vhdr:
	kfree(sbi->s_vhdr);
	kfree(sbi->s_backup_vhdr);
out_unload_nls:
	unload_nls(sbi->nls);
	unload_nls(nls);
	kfree(sbi);
out:
	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_i_callback(struct rcu_head *head)
{
	struct inode *inode = container_of(head, struct inode, i_rcu);

	INIT_LIST_HEAD(&inode->i_dentry);
	kmem_cache_free(hfsplus_inode_cachep, HFSPLUS_I(inode));
}

static void hfsplus_destroy_inode(struct inode *inode)
{
	call_rcu(&inode->i_rcu, hfsplus_i_callback);
}

#define HFSPLUS_INODE_SIZE	sizeof(struct hfsplus_inode_info)

static struct dentry *hfsplus_mount(struct file_system_type *fs_type,
			  int flags, const char *dev_name, void *data)
{
	return mount_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super);
}

static struct file_system_type hfsplus_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "hfsplus",
	.mount		= hfsplus_mount,
	.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 ([email protected])
	6	* (C) 2003 Ardis Technologies <[email protected]>
	7	*
	8	*/
	9
1da177e4 LT	10	#include <linux/module.h>
	11	#include <linux/init.h>
	12	#include <linux/pagemap.h>
34a2d313	13	#include <linux/blkdev.h>
1da177e4	14	#include <linux/fs.h>
1da177e4	15	#include <linux/slab.h>
1da177e4 LT	16	#include <linux/vfs.h>
	17	#include <linux/nls.h>
	18
	19	static struct inode hfsplus_alloc_inode(struct super_block sb);
	20	static void hfsplus_destroy_inode(struct inode *inode);
	21
	22	#include "hfsplus_fs.h"
	23
fc4fff82 CH	24	static int hfsplus_system_read_inode(struct inode *inode)
	25	{
	26	struct hfsplus_vh *vhdr = HFSPLUS_SB(inode->i_sb)->s_vhdr;
	27
	28	switch (inode->i_ino) {
	29	case HFSPLUS_EXT_CNID:
	30	hfsplus_inode_read_fork(inode, &vhdr->ext_file);
	31	inode->i_mapping->a_ops = &hfsplus_btree_aops;
	32	break;
	33	case HFSPLUS_CAT_CNID:
	34	hfsplus_inode_read_fork(inode, &vhdr->cat_file);
	35	inode->i_mapping->a_ops = &hfsplus_btree_aops;
	36	break;
	37	case HFSPLUS_ALLOC_CNID:
	38	hfsplus_inode_read_fork(inode, &vhdr->alloc_file);
	39	inode->i_mapping->a_ops = &hfsplus_aops;
	40	break;
	41	case HFSPLUS_START_CNID:
	42	hfsplus_inode_read_fork(inode, &vhdr->start_file);
	43	break;
	44	case HFSPLUS_ATTR_CNID:
	45	hfsplus_inode_read_fork(inode, &vhdr->attr_file);
	46	inode->i_mapping->a_ops = &hfsplus_btree_aops;
	47	break;
	48	default:
	49	return -EIO;
	50	}
	51
	52	return 0;
	53	}
	54
63525391	55	struct inode hfsplus_iget(struct super_block sb, unsigned long ino)
1da177e4 LT	56	{
1da177e4 LT	57	struct hfs_find_data fd;
63525391	58	struct inode *inode;
fc4fff82	59	int err;
63525391 DH	60
	61	inode = iget_locked(sb, ino);
	62	if (!inode)
	63	return ERR_PTR(-ENOMEM);
	64	if (!(inode->i_state & I_NEW))
	65	return inode;
1da177e4	66
6af502de CH	67	INIT_LIST_HEAD(&HFSPLUS_I(inode)->open_dir_list);
	68	mutex_init(&HFSPLUS_I(inode)->extents_lock);
	69	HFSPLUS_I(inode)->flags = 0;
b33b7921	70	HFSPLUS_I(inode)->extent_state = 0;
6af502de CH	71	HFSPLUS_I(inode)->rsrc_inode = NULL;
6af502de CH	72	atomic_set(&HFSPLUS_I(inode)->opencnt, 0);
1da177e4	73
fc4fff82 CH	74	if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID \|\|
fc4fff82 CH	75	inode->i_ino == HFSPLUS_ROOT_CNID) {
dd73a01a	76	hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd);
1da177e4 LT	77	err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
	78	if (!err)
	79	err = hfsplus_cat_read_inode(inode, &fd);
	80	hfs_find_exit(&fd);
fc4fff82 CH	81	} else {
fc4fff82 CH	82	err = hfsplus_system_read_inode(inode);
1da177e4	83	}
fc4fff82 CH	84
	85	if (err) {
	86	iget_failed(inode);
	87	return ERR_PTR(err);
1da177e4 LT	88	}
1da177e4 LT	89
63525391 DH	90	unlock_new_inode(inode);
63525391 DH	91	return inode;
1da177e4 LT	92	}
1da177e4 LT	93
b5080f77	94	static int hfsplus_system_write_inode(struct inode *inode)
1da177e4	95	{
dd73a01a	96	struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
b5080f77 CH	97	struct hfsplus_vh *vhdr = sbi->s_vhdr;
	98	struct hfsplus_fork_raw *fork;
	99	struct hfs_btree *tree = NULL;
1da177e4	100
1da177e4	101	switch (inode->i_ino) {
1da177e4	102	case HFSPLUS_EXT_CNID:
b5080f77 CH	103	fork = &vhdr->ext_file;
b5080f77 CH	104	tree = sbi->ext_tree;
1da177e4 LT	105	break;
1da177e4 LT	106	case HFSPLUS_CAT_CNID:
b5080f77 CH	107	fork = &vhdr->cat_file;
b5080f77 CH	108	tree = sbi->cat_tree;
1da177e4 LT	109	break;
1da177e4 LT	110	case HFSPLUS_ALLOC_CNID:
b5080f77	111	fork = &vhdr->alloc_file;
1da177e4 LT	112	break;
1da177e4 LT	113	case HFSPLUS_START_CNID:
b5080f77	114	fork = &vhdr->start_file;
1da177e4 LT	115	break;
1da177e4 LT	116	case HFSPLUS_ATTR_CNID:
b5080f77 CH	117	fork = &vhdr->attr_file;
	118	tree = sbi->attr_tree;
	119	default:
	120	return -EIO;
	121	}
	122
	123	if (fork->total_size != cpu_to_be64(inode->i_size)) {
84adede3	124	set_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags);
b5080f77	125	inode->i_sb->s_dirt = 1;
1da177e4	126	}
b5080f77 CH	127	hfsplus_inode_write_fork(inode, fork);
	128	if (tree)
	129	hfs_btree_write(tree);
	130	return 0;
	131	}
	132
	133	static int hfsplus_write_inode(struct inode *inode,
	134	struct writeback_control *wbc)
	135	{
	136	dprint(DBG_INODE, "hfsplus_write_inode: %lu\n", inode->i_ino);
	137
	138	hfsplus_ext_write_extent(inode);
	139
	140	if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID \|\|
	141	inode->i_ino == HFSPLUS_ROOT_CNID)
	142	return hfsplus_cat_write_inode(inode);
	143	else
	144	return hfsplus_system_write_inode(inode);
1da177e4 LT	145	}
1da177e4 LT	146
b57922d9	147	static void hfsplus_evict_inode(struct inode *inode)
1da177e4	148	{
b57922d9 AV	149	dprint(DBG_INODE, "hfsplus_evict_inode: %lu\n", inode->i_ino);
	150	truncate_inode_pages(&inode->i_data, 0);
	151	end_writeback(inode);
1da177e4	152	if (HFSPLUS_IS_RSRC(inode)) {
6af502de CH	153	HFSPLUS_I(HFSPLUS_I(inode)->rsrc_inode)->rsrc_inode = NULL;
6af502de CH	154	iput(HFSPLUS_I(inode)->rsrc_inode);
1da177e4	155	}
1da177e4 LT	156	}
1da177e4 LT	157
b5fc510c	158	int hfsplus_sync_fs(struct super_block *sb, int wait)
1da177e4	159	{
dd73a01a CH	160	struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
dd73a01a CH	161	struct hfsplus_vh *vhdr = sbi->s_vhdr;
52399b17 CH	162	int write_backup = 0;
52399b17 CH	163	int error, error2;
1da177e4	164
f02e26f8 CH	165	if (!wait)
f02e26f8 CH	166	return 0;
1da177e4 LT	167
1da177e4 LT	168	dprint(DBG_SUPER, "hfsplus_write_super\n");
ebc1ac16	169
1da177e4	170	sb->s_dirt = 0;
1da177e4	171
7dc4f001 CH	172	/*
	173	* Explicitly write out the special metadata inodes.
	174	*
	175	* While these special inodes are marked as hashed and written
	176	* out peridocically by the flusher threads we redirty them
	177	* during writeout of normal inodes, and thus the life lock
	178	* prevents us from getting the latest state to disk.
	179	*/
	180	error = filemap_write_and_wait(sbi->cat_tree->inode->i_mapping);
	181	error2 = filemap_write_and_wait(sbi->ext_tree->inode->i_mapping);
	182	if (!error)
	183	error = error2;
	184	error2 = filemap_write_and_wait(sbi->alloc_file->i_mapping);
	185	if (!error)
	186	error = error2;
	187
52399b17 CH	188	mutex_lock(&sbi->vh_mutex);
52399b17 CH	189	mutex_lock(&sbi->alloc_mutex);
dd73a01a	190	vhdr->free_blocks = cpu_to_be32(sbi->free_blocks);
dd73a01a CH	191	vhdr->next_cnid = cpu_to_be32(sbi->next_cnid);
	192	vhdr->folder_count = cpu_to_be32(sbi->folder_count);
	193	vhdr->file_count = cpu_to_be32(sbi->file_count);
1da177e4	194
84adede3	195	if (test_and_clear_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags)) {
52399b17 CH	196	memcpy(sbi->s_backup_vhdr, sbi->s_vhdr, sizeof(*sbi->s_vhdr));
52399b17 CH	197	write_backup = 1;
1da177e4	198	}
52399b17	199
7dc4f001	200	error2 = hfsplus_submit_bio(sb->s_bdev,
52399b17 CH	201	sbi->part_start + HFSPLUS_VOLHEAD_SECTOR,
52399b17 CH	202	sbi->s_vhdr, WRITE_SYNC);
7dc4f001 CH	203	if (!error)
7dc4f001 CH	204	error = error2;
52399b17 CH	205	if (!write_backup)
	206	goto out;
	207
	208	error2 = hfsplus_submit_bio(sb->s_bdev,
	209	sbi->part_start + sbi->sect_count - 2,
	210	sbi->s_backup_vhdr, WRITE_SYNC);
	211	if (!error)
	212	error2 = error;
	213	out:
dd73a01a	214	mutex_unlock(&sbi->alloc_mutex);
7ac9fb9c	215	mutex_unlock(&sbi->vh_mutex);
34a2d313 CH	216
	217	if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))
	218	blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
	219
52399b17	220	return error;
7fbc6df0 CH	221	}
	222
	223	static void hfsplus_write_super(struct super_block *sb)
	224	{
	225	if (!(sb->s_flags & MS_RDONLY))
	226	hfsplus_sync_fs(sb, 1);
	227	else
	228	sb->s_dirt = 0;
1da177e4 LT	229	}
	230
	231	static void hfsplus_put_super(struct super_block *sb)
	232	{
dd73a01a CH	233	struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
dd73a01a CH	234
1da177e4	235	dprint(DBG_SUPER, "hfsplus_put_super\n");
dd73a01a	236
945b0920 CL	237	if (!sb->s_fs_info)
945b0920 CL	238	return;
6cfd0148	239
dd73a01a CH	240	if (!(sb->s_flags & MS_RDONLY) && sbi->s_vhdr) {
dd73a01a CH	241	struct hfsplus_vh *vhdr = sbi->s_vhdr;
1da177e4 LT	242
	243	vhdr->modify_date = hfsp_now2mt();
	244	vhdr->attributes \|= cpu_to_be32(HFSPLUS_VOL_UNMNT);
	245	vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
3b5ce8ae CH	246
3b5ce8ae CH	247	hfsplus_sync_fs(sb, 1);
1da177e4 LT	248	}
1da177e4 LT	249
dd73a01a CH	250	hfs_btree_close(sbi->cat_tree);
	251	hfs_btree_close(sbi->ext_tree);
	252	iput(sbi->alloc_file);
	253	iput(sbi->hidden_dir);
52399b17 CH	254	kfree(sbi->s_vhdr);
52399b17 CH	255	kfree(sbi->s_backup_vhdr);
dd73a01a	256	unload_nls(sbi->nls);
945b0920 CL	257	kfree(sb->s_fs_info);
945b0920 CL	258	sb->s_fs_info = NULL;
1da177e4 LT	259	}
1da177e4 LT	260
726c3342	261	static int hfsplus_statfs(struct dentry dentry, struct kstatfs buf)
1da177e4	262	{
726c3342	263	struct super_block *sb = dentry->d_sb;
dd73a01a	264	struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
25564dd8	265	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
726c3342	266
1da177e4 LT	267	buf->f_type = HFSPLUS_SUPER_MAGIC;
1da177e4 LT	268	buf->f_bsize = sb->s_blocksize;
dd73a01a CH	269	buf->f_blocks = sbi->total_blocks << sbi->fs_shift;
dd73a01a CH	270	buf->f_bfree = sbi->free_blocks << sbi->fs_shift;
1da177e4 LT	271	buf->f_bavail = buf->f_bfree;
1da177e4 LT	272	buf->f_files = 0xFFFFFFFF;
dd73a01a	273	buf->f_ffree = 0xFFFFFFFF - sbi->next_cnid;
25564dd8 CL	274	buf->f_fsid.val[0] = (u32)id;
25564dd8 CL	275	buf->f_fsid.val[1] = (u32)(id >> 32);
1da177e4 LT	276	buf->f_namelen = HFSPLUS_MAX_STRLEN;
	277
	278	return 0;
	279	}
	280
	281	static int hfsplus_remount(struct super_block sb, int flags, char *data)
	282	{
	283	if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
	284	return 0;
	285	if (!(*flags & MS_RDONLY)) {
dd73a01a	286	struct hfsplus_vh *vhdr = HFSPLUS_SB(sb)->s_vhdr;
6f80dfe5	287	int force = 0;
b0b623c3	288
6f80dfe5	289	if (!hfsplus_parse_options_remount(data, &force))
b0b623c3	290	return -EINVAL;
1da177e4 LT	291
1da177e4 LT	292	if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
2753cc28 AS	293	printk(KERN_WARNING "hfs: filesystem was "
	294	"not cleanly unmounted, "
	295	"running fsck.hfsplus is recommended. "
	296	"leaving read-only.\n");
1da177e4 LT	297	sb->s_flags \|= MS_RDONLY;
1da177e4 LT	298	*flags \|= MS_RDONLY;
6f80dfe5	299	} else if (force) {
b0b623c3	300	/* nothing */
2753cc28 AS	301	} else if (vhdr->attributes &
	302	cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
	303	printk(KERN_WARNING "hfs: filesystem is marked locked, "
	304	"leaving read-only.\n");
1da177e4 LT	305	sb->s_flags \|= MS_RDONLY;
1da177e4 LT	306	*flags \|= MS_RDONLY;
2753cc28 AS	307	} else if (vhdr->attributes &
	308	cpu_to_be32(HFSPLUS_VOL_JOURNALED)) {
	309	printk(KERN_WARNING "hfs: filesystem is "
	310	"marked journaled, "
	311	"leaving read-only.\n");
b0b623c3 RZ	312	sb->s_flags \|= MS_RDONLY;
b0b623c3 RZ	313	*flags \|= MS_RDONLY;
1da177e4 LT	314	}
	315	}
	316	return 0;
	317	}
	318
ee9b6d61	319	static const struct super_operations hfsplus_sops = {
1da177e4 LT	320	.alloc_inode = hfsplus_alloc_inode,
1da177e4 LT	321	.destroy_inode = hfsplus_destroy_inode,
1da177e4	322	.write_inode = hfsplus_write_inode,
b57922d9	323	.evict_inode = hfsplus_evict_inode,
1da177e4 LT	324	.put_super = hfsplus_put_super,
1da177e4 LT	325	.write_super = hfsplus_write_super,
7fbc6df0	326	.sync_fs = hfsplus_sync_fs,
1da177e4 LT	327	.statfs = hfsplus_statfs,
1da177e4 LT	328	.remount_fs = hfsplus_remount,
717dd80e	329	.show_options = hfsplus_show_options,
1da177e4 LT	330	};
	331
	332	static int hfsplus_fill_super(struct super_block sb, void data, int silent)
	333	{
	334	struct hfsplus_vh *vhdr;
	335	struct hfsplus_sb_info *sbi;
	336	hfsplus_cat_entry entry;
	337	struct hfs_find_data fd;
63525391	338	struct inode root, inode;
1da177e4 LT	339	struct qstr str;
1da177e4 LT	340	struct nls_table *nls = NULL;
c5b8d0bc	341	int err;
1da177e4	342
c5b8d0bc	343	err = -EINVAL;
a5001a27	344	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1da177e4	345	if (!sbi)
c5b8d0bc	346	goto out;
1da177e4	347
1da177e4	348	sb->s_fs_info = sbi;
40bf48af	349	mutex_init(&sbi->alloc_mutex);
7ac9fb9c	350	mutex_init(&sbi->vh_mutex);
717dd80e	351	hfsplus_fill_defaults(sbi);
c5b8d0bc CH	352
c5b8d0bc CH	353	err = -EINVAL;
717dd80e	354	if (!hfsplus_parse_options(data, sbi)) {
634725a9	355	printk(KERN_ERR "hfs: unable to parse mount options\n");
c5b8d0bc	356	goto out_unload_nls;
1da177e4 LT	357	}
	358
	359	/* temporarily use utf8 to correctly find the hidden dir below */
	360	nls = sbi->nls;
	361	sbi->nls = load_nls("utf8");
bd6a59b2	362	if (!sbi->nls) {
634725a9	363	printk(KERN_ERR "hfs: unable to load nls for utf8\n");
c5b8d0bc	364	goto out_unload_nls;
1da177e4 LT	365	}
	366
	367	/* Grab the volume header */
	368	if (hfsplus_read_wrapper(sb)) {
	369	if (!silent)
634725a9	370	printk(KERN_WARNING "hfs: unable to find HFS+ superblock\n");
c5b8d0bc	371	goto out_unload_nls;
1da177e4	372	}
dd73a01a	373	vhdr = sbi->s_vhdr;
1da177e4 LT	374
1da177e4 LT	375	/* Copy parts of the volume header into the superblock */
2179d372 DE	376	sb->s_magic = HFSPLUS_VOLHEAD_SIG;
	377	if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION \|\|
	378	be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) {
634725a9	379	printk(KERN_ERR "hfs: wrong filesystem version\n");
c5b8d0bc	380	goto out_free_vhdr;
1da177e4	381	}
dd73a01a CH	382	sbi->total_blocks = be32_to_cpu(vhdr->total_blocks);
dd73a01a CH	383	sbi->free_blocks = be32_to_cpu(vhdr->free_blocks);
dd73a01a CH	384	sbi->next_cnid = be32_to_cpu(vhdr->next_cnid);
	385	sbi->file_count = be32_to_cpu(vhdr->file_count);
	386	sbi->folder_count = be32_to_cpu(vhdr->folder_count);
	387	sbi->data_clump_blocks =
	388	be32_to_cpu(vhdr->data_clump_sz) >> sbi->alloc_blksz_shift;
	389	if (!sbi->data_clump_blocks)
	390	sbi->data_clump_blocks = 1;
	391	sbi->rsrc_clump_blocks =
	392	be32_to_cpu(vhdr->rsrc_clump_sz) >> sbi->alloc_blksz_shift;
	393	if (!sbi->rsrc_clump_blocks)
	394	sbi->rsrc_clump_blocks = 1;
1da177e4 LT	395
	396	/* Set up operations so we can load metadata */
	397	sb->s_op = &hfsplus_sops;
	398	sb->s_maxbytes = MAX_LFS_FILESIZE;
	399
	400	if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
2753cc28 AS	401	printk(KERN_WARNING "hfs: Filesystem was "
	402	"not cleanly unmounted, "
	403	"running fsck.hfsplus is recommended. "
	404	"mounting read-only.\n");
1da177e4	405	sb->s_flags \|= MS_RDONLY;
84adede3	406	} else if (test_and_clear_bit(HFSPLUS_SB_FORCE, &sbi->flags)) {
b0b623c3	407	/* nothing */
1da177e4	408	} else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
634725a9	409	printk(KERN_WARNING "hfs: Filesystem is marked locked, mounting read-only.\n");
1da177e4	410	sb->s_flags \|= MS_RDONLY;
2753cc28 AS	411	} else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) &&
	412	!(sb->s_flags & MS_RDONLY)) {
	413	printk(KERN_WARNING "hfs: write access to "
	414	"a journaled filesystem is not supported, "
	415	"use the force option at your own risk, "
	416	"mounting read-only.\n");
b0b623c3	417	sb->s_flags \|= MS_RDONLY;
1da177e4 LT	418	}
	419
	420	/* Load metadata objects (BTrees) /
dd73a01a CH	421	sbi->ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
dd73a01a CH	422	if (!sbi->ext_tree) {
634725a9	423	printk(KERN_ERR "hfs: failed to load extents file\n");
c5b8d0bc	424	goto out_free_vhdr;
1da177e4	425	}
dd73a01a CH	426	sbi->cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
dd73a01a CH	427	if (!sbi->cat_tree) {
634725a9	428	printk(KERN_ERR "hfs: failed to load catalog file\n");
c5b8d0bc	429	goto out_close_ext_tree;
1da177e4 LT	430	}
1da177e4 LT	431
63525391 DH	432	inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID);
63525391 DH	433	if (IS_ERR(inode)) {
634725a9	434	printk(KERN_ERR "hfs: failed to load allocation file\n");
63525391	435	err = PTR_ERR(inode);
c5b8d0bc	436	goto out_close_cat_tree;
1da177e4	437	}
dd73a01a	438	sbi->alloc_file = inode;
1da177e4 LT	439
1da177e4 LT	440	/* Load the root directory */
63525391 DH	441	root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID);
	442	if (IS_ERR(root)) {
	443	printk(KERN_ERR "hfs: failed to load root directory\n");
	444	err = PTR_ERR(root);
c5b8d0bc	445	goto out_put_alloc_file;
1da177e4 LT	446	}
	447
	448	str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
	449	str.name = HFSP_HIDDENDIR_NAME;
dd73a01a	450	hfs_find_init(sbi->cat_tree, &fd);
1da177e4 LT	451	hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
	452	if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
	453	hfs_find_exit(&fd);
	454	if (entry.type != cpu_to_be16(HFSPLUS_FOLDER))
c5b8d0bc	455	goto out_put_root;
63525391 DH	456	inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id));
	457	if (IS_ERR(inode)) {
	458	err = PTR_ERR(inode);
c5b8d0bc	459	goto out_put_root;
63525391	460	}
dd73a01a	461	sbi->hidden_dir = inode;
1da177e4 LT	462	} else
	463	hfs_find_exit(&fd);
	464
c5b8d0bc CH	465	if (!(sb->s_flags & MS_RDONLY)) {
	466	/*
	467	* H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
	468	* all three are registered with Apple for our use
	469	*/
	470	vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
	471	vhdr->modify_date = hfsp_now2mt();
	472	be32_add_cpu(&vhdr->write_count, 1);
	473	vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
	474	vhdr->attributes \|= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
	475	hfsplus_sync_fs(sb, 1);
1da177e4	476
c5b8d0bc CH	477	if (!sbi->hidden_dir) {
	478	mutex_lock(&sbi->vh_mutex);
	479	sbi->hidden_dir = hfsplus_new_inode(sb, S_IFDIR);
	480	hfsplus_create_cat(sbi->hidden_dir->i_ino, root, &str,
	481	sbi->hidden_dir);
	482	mutex_unlock(&sbi->vh_mutex);
	483
	484	hfsplus_mark_inode_dirty(sbi->hidden_dir,
	485	HFSPLUS_I_CAT_DIRTY);
	486	}
1da177e4	487	}
c5b8d0bc CH	488
	489	sb->s_d_op = &hfsplus_dentry_operations;
	490	sb->s_root = d_alloc_root(root);
	491	if (!sb->s_root) {
	492	err = -ENOMEM;
	493	goto out_put_hidden_dir;
	494	}
	495
1da177e4 LT	496	unload_nls(sbi->nls);
	497	sbi->nls = nls;
	498	return 0;
	499
c5b8d0bc CH	500	out_put_hidden_dir:
	501	iput(sbi->hidden_dir);
	502	out_put_root:
	503	iput(sbi->alloc_file);
	504	out_put_alloc_file:
	505	iput(sbi->alloc_file);
	506	out_close_cat_tree:
	507	hfs_btree_close(sbi->cat_tree);
	508	out_close_ext_tree:
	509	hfs_btree_close(sbi->ext_tree);
	510	out_free_vhdr:
	511	kfree(sbi->s_vhdr);
	512	kfree(sbi->s_backup_vhdr);
	513	out_unload_nls:
	514	unload_nls(sbi->nls);
6d729e44	515	unload_nls(nls);
c5b8d0bc CH	516	kfree(sbi);
c5b8d0bc CH	517	out:
1da177e4 LT	518	return err;
	519	}
	520
	521	MODULE_AUTHOR("Brad Boyer");
	522	MODULE_DESCRIPTION("Extended Macintosh Filesystem");
	523	MODULE_LICENSE("GPL");
	524
e18b890b	525	static struct kmem_cache *hfsplus_inode_cachep;
1da177e4 LT	526
	527	static struct inode hfsplus_alloc_inode(struct super_block sb)
	528	{
	529	struct hfsplus_inode_info *i;
	530
e94b1766	531	i = kmem_cache_alloc(hfsplus_inode_cachep, GFP_KERNEL);
1da177e4 LT	532	return i ? &i->vfs_inode : NULL;
	533	}
	534
fa0d7e3d	535	static void hfsplus_i_callback(struct rcu_head *head)
1da177e4	536	{
fa0d7e3d NP	537	struct inode *inode = container_of(head, struct inode, i_rcu);
	538
	539	INIT_LIST_HEAD(&inode->i_dentry);
6af502de	540	kmem_cache_free(hfsplus_inode_cachep, HFSPLUS_I(inode));
1da177e4 LT	541	}
1da177e4 LT	542
fa0d7e3d NP	543	static void hfsplus_destroy_inode(struct inode *inode)
	544	{
	545	call_rcu(&inode->i_rcu, hfsplus_i_callback);
	546	}
	547
1da177e4 LT	548	#define HFSPLUS_INODE_SIZE sizeof(struct hfsplus_inode_info)
1da177e4 LT	549
152a0836 AV	550	static struct dentry hfsplus_mount(struct file_system_type fs_type,
152a0836 AV	551	int flags, const char dev_name, void data)
1da177e4	552	{
152a0836	553	return mount_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super);
1da177e4 LT	554	}
	555
	556	static struct file_system_type hfsplus_fs_type = {
	557	.owner = THIS_MODULE,
	558	.name = "hfsplus",
152a0836	559	.mount = hfsplus_mount,
1da177e4 LT	560	.kill_sb = kill_block_super,
	561	.fs_flags = FS_REQUIRES_DEV,
	562	};
	563
51cc5068	564	static void hfsplus_init_once(void *p)
1da177e4 LT	565	{
	566	struct hfsplus_inode_info *i = p;
	567
a35afb83	568	inode_init_once(&i->vfs_inode);
1da177e4 LT	569	}
	570
	571	static int __init init_hfsplus_fs(void)
	572	{
	573	int err;
	574
	575	hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache",
	576	HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN,
20c2df83	577	hfsplus_init_once);
1da177e4 LT	578	if (!hfsplus_inode_cachep)
	579	return -ENOMEM;
	580	err = register_filesystem(&hfsplus_fs_type);
	581	if (err)
	582	kmem_cache_destroy(hfsplus_inode_cachep);
	583	return err;
	584	}
	585
	586	static void __exit exit_hfsplus_fs(void)
	587	{
	588	unregister_filesystem(&hfsplus_fs_type);
1a1d92c1	589	kmem_cache_destroy(hfsplus_inode_cachep);
1da177e4 LT	590	}
	591
	592	module_init(init_hfsplus_fs)
	593	module_exit(exit_hfsplus_fs)