hfs_btree_open
extern struct hfs_btree *hfs_btree_open(struct super_block *sb, u32 id,
HFS_SB(sb)->ext_tree = hfs_btree_open(sb, HFS_EXT_CNID, hfs_ext_keycmp);
HFS_SB(sb)->cat_tree = hfs_btree_open(sb, HFS_CAT_CNID, hfs_cat_keycmp);
struct hfs_btree *hfs_btree_open(struct super_block *sb, u32 id);
sbi->ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
sbi->cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
sbi->attr_tree = hfs_btree_open(sb, HFSPLUS_ATTR_CNID);
sbi->attr_tree = hfs_btree_open(sb, HFSPLUS_ATTR_CNID);