hfsplus: remove the rsrc_inodes list

We never walk the list - the only reason for it is to make the resource fork
inodes appear hashed to the writeback code.  Borrow a trick from JFS to do
that without needing a list head.

Signed-off-by: Christoph Hellwig <hch@tuxera.com>

fs/hfsplus/hfsplus_fs.h

@@ -145,8 +145,6 @@ struct hfsplus_sb_info {
 	int part, session;
 
 	unsigned long flags;
-
-	struct hlist_head rsrc_inodes;
 };
 
 #define HFSPLUS_SB_WRITEBACKUP	0x0001

fs/hfsplus/inode.c

@@ -204,7 +204,15 @@ static struct dentry *hfsplus_file_lookup(struct inode *dir, struct dentry *dent
 	hip->rsrc_inode = dir;
 	HFSPLUS_I(dir)->rsrc_inode = inode;
 	igrab(dir);
-	hlist_add_head(&inode->i_hash, &HFSPLUS_SB(sb)->rsrc_inodes);
+
+	/*
+	 * __mark_inode_dirty expects inodes to be hashed.  Since we don't
+	 * want resource fork inodes in the regular inode space, we make them
+	 * appear hashed, but do not put on any lists.  hlist_del()
+	 * will work fine and require no locking.
+	 */
+	inode->i_hash.pprev = &inode->i_hash.next;
+
 	mark_inode_dirty(inode);
 out:
 	d_add(dentry, inode);

fs/hfsplus/super.c

@@ -318,7 +318,6 @@ static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
 		return -ENOMEM;
 
 	sb->s_fs_info = sbi;
-	INIT_HLIST_HEAD(&sbi->rsrc_inodes);
 	mutex_init(&sbi->alloc_mutex);
 	hfsplus_fill_defaults(sbi);
 	if (!hfsplus_parse_options(data, sbi)) {