hfsplus: split up inode flags

Split the flags field in the hfsplus inode into an extent_state
flag that is locked by the extent_lock, and a new flags field
that uses atomic bitops.  The second will grow more flags in the
next patch.

Signed-off-by: Christoph Hellwig <hch@tuxera.com>
diff --git a/fs/hfsplus/super.c b/fs/hfsplus/super.c
index 56e6cf8..9854237 100644
--- a/fs/hfsplus/super.c
+++ b/fs/hfsplus/super.c
@@ -66,6 +66,7 @@
 	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);