[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/config.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/pagemap.h>
#include <linux/fs.h>
#include <linux/sched.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 void hfsplus_read_inode(struct inode *inode)
{
	struct hfs_find_data fd;
	struct hfsplus_vh *vhdr;
	int err;

	INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list);
	init_MUTEX(&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;
		return;
	}
	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;
	}

	return;

 bad_inode:
	make_bad_inode(inode);
}

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;
	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;
}

static int hfsplus_statfs(struct super_block *sb, struct kstatfs *buf)
{
	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_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 struct super_operations hfsplus_sops = {
	.alloc_inode	= hfsplus_alloc_inode,
	.destroy_inode	= hfsplus_destroy_inode,
	.read_inode	= hfsplus_read_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;
	struct qstr str;
	struct nls_table *nls = NULL;
	int err = -EINVAL;

	sbi = kmalloc(sizeof(struct hfsplus_sb_info), GFP_KERNEL);
	if (!sbi)
		return -ENOMEM;

	memset(sbi, 0, sizeof(HFSPLUS_SB(sb)));
	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 = be16_to_cpu(vhdr->signature);
	if (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)) {
		printk(KERN_WARNING "hfs: write access to a jounaled 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;
	}

	HFSPLUS_SB(sb).alloc_file = iget(sb, HFSPLUS_ALLOC_CNID);
	if (!HFSPLUS_SB(sb).alloc_file) {
		printk(KERN_ERR "hfs: failed to load allocation file\n");
		goto cleanup;
	}

	/* Load the root directory */
	root = iget(sb, HFSPLUS_ROOT_CNID);
	sb->s_root = d_alloc_root(root);
	if (!sb->s_root) {
		printk(KERN_ERR "hfs: failed to load root directory\n");
		iput(root);
		goto cleanup;
	}

	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;
		HFSPLUS_SB(sb).hidden_dir = iget(sb, be32_to_cpu(entry.folder.id));
		if (!HFSPLUS_SB(sb).hidden_dir)
			goto cleanup;
	} 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();
	vhdr->write_count = cpu_to_be32(be32_to_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 kmem_cache_t *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, SLAB_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 struct super_block *hfsplus_get_sb(struct file_system_type *fs_type,
					  int flags, const char *dev_name, void *data)
{
	return get_sb_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super);
}

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, kmem_cache_t *cachep, unsigned long flags)
{
	struct hfsplus_inode_info *i = p;

	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == SLAB_CTOR_CONSTRUCTOR)
		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, NULL);
	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);
	if (kmem_cache_destroy(hfsplus_inode_cachep))
		printk(KERN_ERR "hfsplus_inode_cache: not all structures were freed\n");
}

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
	10	#include <linux/config.h>
	11	#include <linux/module.h>
	12	#include <linux/init.h>
	13	#include <linux/pagemap.h>
	14	#include <linux/fs.h>
	15	#include <linux/sched.h>
	16	#include <linux/slab.h>
1da177e4 LT	17	#include <linux/vfs.h>
	18	#include <linux/nls.h>
	19
	20	static struct inode hfsplus_alloc_inode(struct super_block sb);
	21	static void hfsplus_destroy_inode(struct inode *inode);
	22
	23	#include "hfsplus_fs.h"
	24
1da177e4 LT	25	static void hfsplus_read_inode(struct inode *inode)
	26	{
	27	struct hfs_find_data fd;
	28	struct hfsplus_vh *vhdr;
	29	int err;
	30
1da177e4 LT	31	INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list);
	32	init_MUTEX(&HFSPLUS_I(inode).extents_lock);
	33	HFSPLUS_I(inode).flags = 0;
	34	HFSPLUS_I(inode).rsrc_inode = NULL;
94c1d318	35	atomic_set(&HFSPLUS_I(inode).opencnt, 0);
1da177e4 LT	36
	37	if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
	38	read_inode:
	39	hfs_find_init(HFSPLUS_SB(inode->i_sb).cat_tree, &fd);
	40	err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
	41	if (!err)
	42	err = hfsplus_cat_read_inode(inode, &fd);
	43	hfs_find_exit(&fd);
	44	if (err)
	45	goto bad_inode;
	46	return;
	47	}
	48	vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr;
	49	switch(inode->i_ino) {
	50	case HFSPLUS_ROOT_CNID:
	51	goto read_inode;
	52	case HFSPLUS_EXT_CNID:
	53	hfsplus_inode_read_fork(inode, &vhdr->ext_file);
	54	inode->i_mapping->a_ops = &hfsplus_btree_aops;
	55	break;
	56	case HFSPLUS_CAT_CNID:
	57	hfsplus_inode_read_fork(inode, &vhdr->cat_file);
	58	inode->i_mapping->a_ops = &hfsplus_btree_aops;
	59	break;
	60	case HFSPLUS_ALLOC_CNID:
	61	hfsplus_inode_read_fork(inode, &vhdr->alloc_file);
	62	inode->i_mapping->a_ops = &hfsplus_aops;
	63	break;
	64	case HFSPLUS_START_CNID:
	65	hfsplus_inode_read_fork(inode, &vhdr->start_file);
	66	break;
	67	case HFSPLUS_ATTR_CNID:
	68	hfsplus_inode_read_fork(inode, &vhdr->attr_file);
	69	inode->i_mapping->a_ops = &hfsplus_btree_aops;
	70	break;
	71	default:
	72	goto bad_inode;
	73	}
	74
	75	return;
	76
	77	bad_inode:
	78	make_bad_inode(inode);
	79	}
	80
	81	static int hfsplus_write_inode(struct inode *inode, int unused)
	82	{
	83	struct hfsplus_vh *vhdr;
	84	int ret = 0;
	85
	86	dprint(DBG_INODE, "hfsplus_write_inode: %lu\n", inode->i_ino);
	87	hfsplus_ext_write_extent(inode);
	88	if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
	89	return hfsplus_cat_write_inode(inode);
	90	}
	91	vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr;
	92	switch (inode->i_ino) {
	93	case HFSPLUS_ROOT_CNID:
	94	ret = hfsplus_cat_write_inode(inode);
	95	break;
	96	case HFSPLUS_EXT_CNID:
	97	if (vhdr->ext_file.total_size != cpu_to_be64(inode->i_size)) {
	98	HFSPLUS_SB(inode->i_sb).flags \|= HFSPLUS_SB_WRITEBACKUP;
	99	inode->i_sb->s_dirt = 1;
100	}
101	hfsplus_inode_write_fork(inode, &vhdr->ext_file);
102	hfs_btree_write(HFSPLUS_SB(inode->i_sb).ext_tree);
103	break;
104	case HFSPLUS_CAT_CNID:
105	if (vhdr->cat_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->cat_file);
110	hfs_btree_write(HFSPLUS_SB(inode->i_sb).cat_tree);
111	break;
112	case HFSPLUS_ALLOC_CNID:
113	if (vhdr->alloc_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->alloc_file);
118	break;
119	case HFSPLUS_START_CNID:
120	if (vhdr->start_file.total_size != cpu_to_be64(inode->i_size)) {
121	HFSPLUS_SB(inode->i_sb).flags \|= HFSPLUS_SB_WRITEBACKUP;
122	inode->i_sb->s_dirt = 1;
123	}
124	hfsplus_inode_write_fork(inode, &vhdr->start_file);
125	break;
126	case HFSPLUS_ATTR_CNID:
127	if (vhdr->attr_file.total_size != cpu_to_be64(inode->i_size)) {
128	HFSPLUS_SB(inode->i_sb).flags \|= HFSPLUS_SB_WRITEBACKUP;
129	inode->i_sb->s_dirt = 1;
130	}
131	hfsplus_inode_write_fork(inode, &vhdr->attr_file);
132	hfs_btree_write(HFSPLUS_SB(inode->i_sb).attr_tree);
133	break;
134	}
135	return ret;
136	}
137
138	static void hfsplus_clear_inode(struct inode *inode)
139	{
140	dprint(DBG_INODE, "hfsplus_clear_inode: %lu\n", inode->i_ino);
1da177e4 LT	141	if (HFSPLUS_IS_RSRC(inode)) {
	142	HFSPLUS_I(HFSPLUS_I(inode).rsrc_inode).rsrc_inode = NULL;
	143	iput(HFSPLUS_I(inode).rsrc_inode);
	144	}
1da177e4 LT	145	}
	146
	147	static void hfsplus_write_super(struct super_block *sb)
	148	{
	149	struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
	150
	151	dprint(DBG_SUPER, "hfsplus_write_super\n");
	152	sb->s_dirt = 0;
	153	if (sb->s_flags & MS_RDONLY)
	154	/* warn? */
	155	return;
	156
	157	vhdr->free_blocks = cpu_to_be32(HFSPLUS_SB(sb).free_blocks);
	158	vhdr->next_alloc = cpu_to_be32(HFSPLUS_SB(sb).next_alloc);
	159	vhdr->next_cnid = cpu_to_be32(HFSPLUS_SB(sb).next_cnid);
	160	vhdr->folder_count = cpu_to_be32(HFSPLUS_SB(sb).folder_count);
	161	vhdr->file_count = cpu_to_be32(HFSPLUS_SB(sb).file_count);
	162
	163	mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
	164	if (HFSPLUS_SB(sb).flags & HFSPLUS_SB_WRITEBACKUP) {
	165	if (HFSPLUS_SB(sb).sect_count) {
	166	struct buffer_head *bh;
	167	u32 block, offset;
	168
	169	block = HFSPLUS_SB(sb).blockoffset;
	170	block += (HFSPLUS_SB(sb).sect_count - 2) >> (sb->s_blocksize_bits - 9);
	171	offset = ((HFSPLUS_SB(sb).sect_count - 2) << 9) & (sb->s_blocksize - 1);
634725a9	172	printk(KERN_DEBUG "hfs: backup: %u,%u,%u,%u\n", HFSPLUS_SB(sb).blockoffset,
1da177e4 LT	173	HFSPLUS_SB(sb).sect_count, block, offset);
	174	bh = sb_bread(sb, block);
	175	if (bh) {
	176	vhdr = (struct hfsplus_vh *)(bh->b_data + offset);
	177	if (be16_to_cpu(vhdr->signature) == HFSPLUS_VOLHEAD_SIG) {
	178	memcpy(vhdr, HFSPLUS_SB(sb).s_vhdr, sizeof(*vhdr));
	179	mark_buffer_dirty(bh);
	180	brelse(bh);
	181	} else
634725a9	182	printk(KERN_WARNING "hfs: backup not found!\n");
1da177e4 LT	183	}
	184	}
	185	HFSPLUS_SB(sb).flags &= ~HFSPLUS_SB_WRITEBACKUP;
	186	}
	187	}
	188
	189	static void hfsplus_put_super(struct super_block *sb)
	190	{
	191	dprint(DBG_SUPER, "hfsplus_put_super\n");
945b0920 CL	192	if (!sb->s_fs_info)
	193	return;
	194	if (!(sb->s_flags & MS_RDONLY) && HFSPLUS_SB(sb).s_vhdr) {
1da177e4 LT	195	struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
	196
	197	vhdr->modify_date = hfsp_now2mt();
	198	vhdr->attributes \|= cpu_to_be32(HFSPLUS_VOL_UNMNT);
	199	vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
	200	mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
e39f07c8	201	sync_dirty_buffer(HFSPLUS_SB(sb).s_vhbh);
1da177e4 LT	202	}
	203
	204	hfs_btree_close(HFSPLUS_SB(sb).cat_tree);
	205	hfs_btree_close(HFSPLUS_SB(sb).ext_tree);
	206	iput(HFSPLUS_SB(sb).alloc_file);
	207	iput(HFSPLUS_SB(sb).hidden_dir);
	208	brelse(HFSPLUS_SB(sb).s_vhbh);
	209	if (HFSPLUS_SB(sb).nls)
	210	unload_nls(HFSPLUS_SB(sb).nls);
945b0920 CL	211	kfree(sb->s_fs_info);
945b0920 CL	212	sb->s_fs_info = NULL;
1da177e4 LT	213	}
	214
	215	static int hfsplus_statfs(struct super_block sb, struct kstatfs buf)
	216	{
	217	buf->f_type = HFSPLUS_SUPER_MAGIC;
	218	buf->f_bsize = sb->s_blocksize;
	219	buf->f_blocks = HFSPLUS_SB(sb).total_blocks << HFSPLUS_SB(sb).fs_shift;
	220	buf->f_bfree = HFSPLUS_SB(sb).free_blocks << HFSPLUS_SB(sb).fs_shift;
	221	buf->f_bavail = buf->f_bfree;
	222	buf->f_files = 0xFFFFFFFF;
	223	buf->f_ffree = 0xFFFFFFFF - HFSPLUS_SB(sb).next_cnid;
	224	buf->f_namelen = HFSPLUS_MAX_STRLEN;
	225
	226	return 0;
	227	}
	228
	229	static int hfsplus_remount(struct super_block sb, int flags, char *data)
	230	{
	231	if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
	232	return 0;
	233	if (!(*flags & MS_RDONLY)) {
	234	struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
b0b623c3 RZ	235	struct hfsplus_sb_info sbi;
	236
	237	memset(&sbi, 0, sizeof(struct hfsplus_sb_info));
	238	sbi.nls = HFSPLUS_SB(sb).nls;
	239	if (!hfsplus_parse_options(data, &sbi))
	240	return -EINVAL;
1da177e4 LT	241
1da177e4 LT	242	if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
634725a9	243	printk(KERN_WARNING "hfs: filesystem was not cleanly unmounted, "
1da177e4 LT	244	"running fsck.hfsplus is recommended. leaving read-only.\n");
	245	sb->s_flags \|= MS_RDONLY;
	246	*flags \|= MS_RDONLY;
b0b623c3 RZ	247	} else if (sbi.flags & HFSPLUS_SB_FORCE) {
b0b623c3 RZ	248	/* nothing */
1da177e4	249	} else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
634725a9	250	printk(KERN_WARNING "hfs: filesystem is marked locked, leaving read-only.\n");
1da177e4 LT	251	sb->s_flags \|= MS_RDONLY;
1da177e4 LT	252	*flags \|= MS_RDONLY;
b0b623c3	253	} else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) {
634725a9	254	printk(KERN_WARNING "hfs: filesystem is marked journaled, leaving read-only.\n");
b0b623c3 RZ	255	sb->s_flags \|= MS_RDONLY;
b0b623c3 RZ	256	*flags \|= MS_RDONLY;
1da177e4 LT	257	}
	258	}
	259	return 0;
	260	}
	261
	262	static struct super_operations hfsplus_sops = {
	263	.alloc_inode = hfsplus_alloc_inode,
	264	.destroy_inode = hfsplus_destroy_inode,
	265	.read_inode = hfsplus_read_inode,
	266	.write_inode = hfsplus_write_inode,
	267	.clear_inode = hfsplus_clear_inode,
	268	.put_super = hfsplus_put_super,
	269	.write_super = hfsplus_write_super,
	270	.statfs = hfsplus_statfs,
	271	.remount_fs = hfsplus_remount,
717dd80e	272	.show_options = hfsplus_show_options,
1da177e4 LT	273	};
	274
	275	static int hfsplus_fill_super(struct super_block sb, void data, int silent)
	276	{
	277	struct hfsplus_vh *vhdr;
	278	struct hfsplus_sb_info *sbi;
	279	hfsplus_cat_entry entry;
	280	struct hfs_find_data fd;
	281	struct inode *root;
	282	struct qstr str;
	283	struct nls_table *nls = NULL;
	284	int err = -EINVAL;
	285
	286	sbi = kmalloc(sizeof(struct hfsplus_sb_info), GFP_KERNEL);
	287	if (!sbi)
	288	return -ENOMEM;
	289
	290	memset(sbi, 0, sizeof(HFSPLUS_SB(sb)));
	291	sb->s_fs_info = sbi;
	292	INIT_HLIST_HEAD(&sbi->rsrc_inodes);
717dd80e RZ	293	hfsplus_fill_defaults(sbi);
717dd80e RZ	294	if (!hfsplus_parse_options(data, sbi)) {
634725a9	295	printk(KERN_ERR "hfs: unable to parse mount options\n");
1da177e4 LT	296	err = -EINVAL;
	297	goto cleanup;
	298	}
	299
	300	/* temporarily use utf8 to correctly find the hidden dir below */
	301	nls = sbi->nls;
	302	sbi->nls = load_nls("utf8");
bd6a59b2	303	if (!sbi->nls) {
634725a9	304	printk(KERN_ERR "hfs: unable to load nls for utf8\n");
1da177e4 LT	305	err = -EINVAL;
	306	goto cleanup;
	307	}
	308
	309	/* Grab the volume header */
	310	if (hfsplus_read_wrapper(sb)) {
	311	if (!silent)
634725a9	312	printk(KERN_WARNING "hfs: unable to find HFS+ superblock\n");
1da177e4 LT	313	err = -EINVAL;
	314	goto cleanup;
	315	}
	316	vhdr = HFSPLUS_SB(sb).s_vhdr;
	317
	318	/* Copy parts of the volume header into the superblock */
	319	sb->s_magic = be16_to_cpu(vhdr->signature);
	320	if (be16_to_cpu(vhdr->version) != HFSPLUS_CURRENT_VERSION) {
634725a9	321	printk(KERN_ERR "hfs: wrong filesystem version\n");
1da177e4 LT	322	goto cleanup;
	323	}
	324	HFSPLUS_SB(sb).total_blocks = be32_to_cpu(vhdr->total_blocks);
	325	HFSPLUS_SB(sb).free_blocks = be32_to_cpu(vhdr->free_blocks);
	326	HFSPLUS_SB(sb).next_alloc = be32_to_cpu(vhdr->next_alloc);
	327	HFSPLUS_SB(sb).next_cnid = be32_to_cpu(vhdr->next_cnid);
	328	HFSPLUS_SB(sb).file_count = be32_to_cpu(vhdr->file_count);
	329	HFSPLUS_SB(sb).folder_count = be32_to_cpu(vhdr->folder_count);
	330	HFSPLUS_SB(sb).data_clump_blocks = be32_to_cpu(vhdr->data_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
	331	if (!HFSPLUS_SB(sb).data_clump_blocks)
	332	HFSPLUS_SB(sb).data_clump_blocks = 1;
	333	HFSPLUS_SB(sb).rsrc_clump_blocks = be32_to_cpu(vhdr->rsrc_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
	334	if (!HFSPLUS_SB(sb).rsrc_clump_blocks)
	335	HFSPLUS_SB(sb).rsrc_clump_blocks = 1;
	336
	337	/* Set up operations so we can load metadata */
	338	sb->s_op = &hfsplus_sops;
	339	sb->s_maxbytes = MAX_LFS_FILESIZE;
	340
	341	if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
634725a9 RZ	342	printk(KERN_WARNING "hfs: Filesystem was not cleanly unmounted, "
634725a9 RZ	343	"running fsck.hfsplus is recommended. mounting read-only.\n");
1da177e4	344	sb->s_flags \|= MS_RDONLY;
b0b623c3 RZ	345	} else if (sbi->flags & HFSPLUS_SB_FORCE) {
b0b623c3 RZ	346	/* nothing */
1da177e4	347	} else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
634725a9	348	printk(KERN_WARNING "hfs: Filesystem is marked locked, mounting read-only.\n");
1da177e4	349	sb->s_flags \|= MS_RDONLY;
b0b623c3	350	} else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) {
634725a9 RZ	351	printk(KERN_WARNING "hfs: write access to a jounaled filesystem is not supported, "
634725a9 RZ	352	"use the force option at your own risk, mounting read-only.\n");
b0b623c3	353	sb->s_flags \|= MS_RDONLY;
1da177e4	354	}
b0b623c3	355	sbi->flags &= ~HFSPLUS_SB_FORCE;
1da177e4 LT	356
	357	/* Load metadata objects (BTrees) /
	358	HFSPLUS_SB(sb).ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
	359	if (!HFSPLUS_SB(sb).ext_tree) {
634725a9	360	printk(KERN_ERR "hfs: failed to load extents file\n");
1da177e4 LT	361	goto cleanup;
	362	}
	363	HFSPLUS_SB(sb).cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
	364	if (!HFSPLUS_SB(sb).cat_tree) {
634725a9	365	printk(KERN_ERR "hfs: failed to load catalog file\n");
1da177e4 LT	366	goto cleanup;
	367	}
	368
	369	HFSPLUS_SB(sb).alloc_file = iget(sb, HFSPLUS_ALLOC_CNID);
	370	if (!HFSPLUS_SB(sb).alloc_file) {
634725a9	371	printk(KERN_ERR "hfs: failed to load allocation file\n");
1da177e4 LT	372	goto cleanup;
	373	}
	374
	375	/* Load the root directory */
	376	root = iget(sb, HFSPLUS_ROOT_CNID);
	377	sb->s_root = d_alloc_root(root);
	378	if (!sb->s_root) {
634725a9	379	printk(KERN_ERR "hfs: failed to load root directory\n");
1da177e4 LT	380	iput(root);
	381	goto cleanup;
	382	}
	383
	384	str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
	385	str.name = HFSP_HIDDENDIR_NAME;
	386	hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
	387	hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
	388	if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
	389	hfs_find_exit(&fd);
	390	if (entry.type != cpu_to_be16(HFSPLUS_FOLDER))
	391	goto cleanup;
	392	HFSPLUS_SB(sb).hidden_dir = iget(sb, be32_to_cpu(entry.folder.id));
	393	if (!HFSPLUS_SB(sb).hidden_dir)
	394	goto cleanup;
	395	} else
	396	hfs_find_exit(&fd);
	397
	398	if (sb->s_flags & MS_RDONLY)
	399	goto out;
	400
	401	/* H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
	402	* all three are registered with Apple for our use
	403	*/
	404	vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
	405	vhdr->modify_date = hfsp_now2mt();
	406	vhdr->write_count = cpu_to_be32(be32_to_cpu(vhdr->write_count) + 1);
	407	vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
	408	vhdr->attributes \|= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
	409	mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
e39f07c8	410	sync_dirty_buffer(HFSPLUS_SB(sb).s_vhbh);
1da177e4 LT	411
1da177e4 LT	412	if (!HFSPLUS_SB(sb).hidden_dir) {
634725a9	413	printk(KERN_DEBUG "hfs: create hidden dir...\n");
1da177e4 LT	414	HFSPLUS_SB(sb).hidden_dir = hfsplus_new_inode(sb, S_IFDIR);
	415	hfsplus_create_cat(HFSPLUS_SB(sb).hidden_dir->i_ino, sb->s_root->d_inode,
	416	&str, HFSPLUS_SB(sb).hidden_dir);
	417	mark_inode_dirty(HFSPLUS_SB(sb).hidden_dir);
	418	}
	419	out:
	420	unload_nls(sbi->nls);
	421	sbi->nls = nls;
	422	return 0;
	423
	424	cleanup:
	425	hfsplus_put_super(sb);
	426	if (nls)
	427	unload_nls(nls);
	428	return err;
	429	}
	430
	431	MODULE_AUTHOR("Brad Boyer");
	432	MODULE_DESCRIPTION("Extended Macintosh Filesystem");
	433	MODULE_LICENSE("GPL");
	434
	435	static kmem_cache_t *hfsplus_inode_cachep;
	436
	437	static struct inode hfsplus_alloc_inode(struct super_block sb)
	438	{
	439	struct hfsplus_inode_info *i;
	440
	441	i = kmem_cache_alloc(hfsplus_inode_cachep, SLAB_KERNEL);
	442	return i ? &i->vfs_inode : NULL;
	443	}
	444
	445	static void hfsplus_destroy_inode(struct inode *inode)
	446	{
	447	kmem_cache_free(hfsplus_inode_cachep, &HFSPLUS_I(inode));
	448	}
	449
	450	#define HFSPLUS_INODE_SIZE sizeof(struct hfsplus_inode_info)
	451
	452	static struct super_block hfsplus_get_sb(struct file_system_type fs_type,
	453	int flags, const char dev_name, void data)
	454	{
	455	return get_sb_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super);
	456	}
	457
	458	static struct file_system_type hfsplus_fs_type = {
	459	.owner = THIS_MODULE,
	460	.name = "hfsplus",
	461	.get_sb = hfsplus_get_sb,
	462	.kill_sb = kill_block_super,
	463	.fs_flags = FS_REQUIRES_DEV,
	464	};
	465
	466	static void hfsplus_init_once(void p, kmem_cache_t cachep, unsigned long flags)
	467	{
	468	struct hfsplus_inode_info *i = p;
	469
	470	if ((flags & (SLAB_CTOR_VERIFY\|SLAB_CTOR_CONSTRUCTOR)) == SLAB_CTOR_CONSTRUCTOR)
	471	inode_init_once(&i->vfs_inode);
	472	}
	473
	474	static int __init init_hfsplus_fs(void)
	475	{
	476	int err;
	477
478	hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache",
479	HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN,
480	hfsplus_init_once, NULL);
481	if (!hfsplus_inode_cachep)
482	return -ENOMEM;
483	err = register_filesystem(&hfsplus_fs_type);
484	if (err)
485	kmem_cache_destroy(hfsplus_inode_cachep);
486	return err;
487	}
488
489	static void __exit exit_hfsplus_fs(void)
490	{
491	unregister_filesystem(&hfsplus_fs_type);
492	if (kmem_cache_destroy(hfsplus_inode_cachep))
634725a9	493	printk(KERN_ERR "hfsplus_inode_cache: not all structures were freed\n");
1da177e4 LT	494	}
	495
	496	module_init(init_hfsplus_fs)
	497	module_exit(exit_hfsplus_fs)