fs/hfsplus/super.c - fp2-dev/kernel/msm - Gitiles

 /*
  *  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/version.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"

 void hfsplus_inode_check(struct super_block *sb)
 {
 #if 0
 	u32 cnt = atomic_read(&HFSPLUS_SB(sb).inode_cnt);
 	u32 last_cnt = HFSPLUS_SB(sb).last_inode_cnt;

 	if (cnt <= (last_cnt / 2) ||
 	    cnt >= (last_cnt * 2)) {
 		HFSPLUS_SB(sb).last_inode_cnt = cnt;
 		printk("inode_check: %u,%u,%u\n", cnt, last_cnt,
 			HFSPLUS_SB(sb).cat_tree ? HFSPLUS_SB(sb).cat_tree->node_hash_cnt : 0);
 	}
 #endif
 }

 static void hfsplus_read_inode(struct inode *inode)
 {
 	struct hfs_find_data fd;
 	struct hfsplus_vh *vhdr;
 	int err;

 	atomic_inc(&HFSPLUS_SB(inode->i_sb).inode_cnt);
 	hfsplus_inode_check(inode->i_sb);
 	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;

 	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);
 	atomic_dec(&HFSPLUS_SB(inode->i_sb).inode_cnt);
 	if (HFSPLUS_IS_RSRC(inode)) {
 		HFSPLUS_I(HFSPLUS_I(inode).rsrc_inode).rsrc_inode = NULL;
 		iput(HFSPLUS_I(inode).rsrc_inode);
 	}
 	hfsplus_inode_check(inode->i_sb);
 }

 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("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("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;

 		if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
 			printk("HFS+-fs warning: Filesystem was not cleanly unmounted, "
 			       "running fsck.hfsplus is recommended.  leaving read-only.\n");
 			sb->s_flags |= MS_RDONLY;
 			*flags |= MS_RDONLY;
 		} else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
 			printk("HFS+-fs: Filesystem is marked locked, 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)) {
 		if (!silent)
 			printk("HFS+-fs: 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 (!nls) {
 		printk("HFS+: unable to load nls for utf8\n");
 		err = -EINVAL;
 		goto cleanup;
 	}

 	/* Grab the volume header */
 	if (hfsplus_read_wrapper(sb)) {
 		if (!silent)
 			printk("HFS+-fs: 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) {
 		if (!silent)
 			printk("HFS+-fs: 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))) {
 		if (!silent)
 			printk("HFS+-fs warning: Filesystem was not cleanly unmounted, "
 			       "running fsck.hfsplus is recommended.  mounting read-only.\n");
 		sb->s_flags |= MS_RDONLY;
 	} else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
 		if (!silent)
 			printk("HFS+-fs: Filesystem is marked locked, mounting read-only.\n");
 		sb->s_flags |= MS_RDONLY;
 	}

 	/* Load metadata objects (B*Trees) */
 	HFSPLUS_SB(sb).ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
 	if (!HFSPLUS_SB(sb).ext_tree) {
 		if (!silent)
 			printk("HFS+-fs: 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) {
 		if (!silent)
 			printk("HFS+-fs: failed to load catalog file\n");
 		goto cleanup;
 	}

 	HFSPLUS_SB(sb).alloc_file = iget(sb, HFSPLUS_ALLOC_CNID);
 	if (!HFSPLUS_SB(sb).alloc_file) {
 		if (!silent)
 			printk("HFS+-fs: 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) {
 		if (!silent)
 			printk("HFS+-fs: 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("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_INFO "hfsplus_inode_cache: not all structures were freed\n");
 }

 module_init(init_hfsplus_fs)
 module_exit(exit_hfsplus_fs)
	/*
	* 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/version.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"

	void hfsplus_inode_check(struct super_block *sb)
	{
	#if 0
	u32 cnt = atomic_read(&HFSPLUS_SB(sb).inode_cnt);
	u32 last_cnt = HFSPLUS_SB(sb).last_inode_cnt;

	if (cnt <= (last_cnt / 2) \|\|
	cnt >= (last_cnt * 2)) {
	HFSPLUS_SB(sb).last_inode_cnt = cnt;
	printk("inode_check: %u,%u,%u\n", cnt, last_cnt,
	HFSPLUS_SB(sb).cat_tree ? HFSPLUS_SB(sb).cat_tree->node_hash_cnt : 0);
	}
	#endif
	}

	static void hfsplus_read_inode(struct inode *inode)
	{
	struct hfs_find_data fd;
	struct hfsplus_vh *vhdr;
	int err;

	atomic_inc(&HFSPLUS_SB(inode->i_sb).inode_cnt);
	hfsplus_inode_check(inode->i_sb);
	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;

	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);
	atomic_dec(&HFSPLUS_SB(inode->i_sb).inode_cnt);
	if (HFSPLUS_IS_RSRC(inode)) {
	HFSPLUS_I(HFSPLUS_I(inode).rsrc_inode).rsrc_inode = NULL;
	iput(HFSPLUS_I(inode).rsrc_inode);
	}
	hfsplus_inode_check(inode->i_sb);
	}

	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("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("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;

	if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
	printk("HFS+-fs warning: Filesystem was not cleanly unmounted, "
	"running fsck.hfsplus is recommended. leaving read-only.\n");
	sb->s_flags \|= MS_RDONLY;
	*flags \|= MS_RDONLY;
	} else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
	printk("HFS+-fs: Filesystem is marked locked, 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)) {
	if (!silent)
	printk("HFS+-fs: 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 (!nls) {
	printk("HFS+: unable to load nls for utf8\n");
	err = -EINVAL;
	goto cleanup;
	}

	/* Grab the volume header */
	if (hfsplus_read_wrapper(sb)) {
	if (!silent)
	printk("HFS+-fs: 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) {
	if (!silent)
	printk("HFS+-fs: 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))) {
	if (!silent)
	printk("HFS+-fs warning: Filesystem was not cleanly unmounted, "
	"running fsck.hfsplus is recommended. mounting read-only.\n");
	sb->s_flags \|= MS_RDONLY;
	} else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
	if (!silent)
	printk("HFS+-fs: Filesystem is marked locked, mounting read-only.\n");
	sb->s_flags \|= MS_RDONLY;
	}

	/* Load metadata objects (BTrees) /
	HFSPLUS_SB(sb).ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
	if (!HFSPLUS_SB(sb).ext_tree) {
	if (!silent)
	printk("HFS+-fs: 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) {
	if (!silent)
	printk("HFS+-fs: failed to load catalog file\n");
	goto cleanup;
	}

	HFSPLUS_SB(sb).alloc_file = iget(sb, HFSPLUS_ALLOC_CNID);
	if (!HFSPLUS_SB(sb).alloc_file) {
	if (!silent)
	printk("HFS+-fs: 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) {
	if (!silent)
	printk("HFS+-fs: 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("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_INFO "hfsplus_inode_cache: not all structures were freed\n");
	}

	module_init(init_hfsplus_fs)
	module_exit(exit_hfsplus_fs)