[XFS] Move the AIL lock into the struct xfs_ail

Bring the ail lock inside the struct xfs_ail. This means the AIL can be
entirely manipulated via the struct xfs_ail rather than needing both the
struct xfs_mount and the struct xfs_ail.

SGI-PV: 988143

SGI-Modid: xfs-linux-melb:xfs-kern:32350a

Signed-off-by: David Chinner <david@fromorbit.com>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
Signed-off-by: Christoph Hellwig <hch@infradead.org>
diff --git a/fs/xfs/xfs_trans.c b/fs/xfs/xfs_trans.c
index 4e1c22a..99ba0e2 100644
--- a/fs/xfs/xfs_trans.c
+++ b/fs/xfs/xfs_trans.c
@@ -1425,7 +1425,7 @@
 		 * the test below.
 		 */
 		mp = lip->li_mountp;
-		spin_lock(&mp->m_ail_lock);
+		spin_lock(&mp->m_ail->xa_lock);
 		if (XFS_LSN_CMP(item_lsn, lip->li_lsn) > 0) {
 			/*
 			 * This will set the item's lsn to item_lsn
@@ -1436,7 +1436,7 @@
 			 */
 			xfs_trans_update_ail(mp, lip, item_lsn);
 		} else {
-			spin_unlock(&mp->m_ail_lock);
+			spin_unlock(&mp->m_ail->xa_lock);
 		}
 
 		/*