btrfs: reorder btrfs_inode to fill gaps

Previous commit created a hole in struct btrfs_inode, we can move
outstanding_extents there. This reduces size by 8 bytes from 1120 to
1112 on a release config.
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/btrfs_inode.h

@@ -113,6 +113,14 @@ struct btrfs_inode {
 	/* held while logging the inode in tree-log.c */
 	struct mutex log_mutex;
 
+	/*
+	 * Counters to keep track of the number of extent item's we may use due
+	 * to delalloc and such.  outstanding_extents is the number of extent
+	 * items we think we'll end up using, and reserved_extents is the number
+	 * of extent items we've reserved metadata for.
+	 */
+	unsigned outstanding_extents;
+
 	/* used to order data wrt metadata */
 	spinlock_t ordered_tree_lock;
 	struct rb_root ordered_tree;
@@ -236,14 +244,6 @@ struct btrfs_inode {
 	/* Read-only compatibility flags, upper half of inode_item::flags */
 	u32 ro_flags;
 
-	/*
-	 * Counters to keep track of the number of extent item's we may use due
-	 * to delalloc and such.  outstanding_extents is the number of extent
-	 * items we think we'll end up using, and reserved_extents is the number
-	 * of extent items we've reserved metadata for.
-	 */
-	unsigned outstanding_extents;
-
 	struct btrfs_block_rsv block_rsv;
 
 	struct btrfs_delayed_node *delayed_node;