[XFS] growlock should be a mutex

m_growlock only needs plain binary mutex semantics, so use a struct mutex
instead of a semaphore for it.

SGI-PV: 968563
SGI-Modid: xfs-linux-melb:xfs-kern:29512a

Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: Tim Shimmin <tes@sgi.com>
diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index ba8df2f..ebdb76d 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -139,7 +139,7 @@
 	AIL_LOCKINIT(&mp->m_ail_lock, "xfs_ail");
 	spinlock_init(&mp->m_sb_lock, "xfs_sb");
 	mutex_init(&mp->m_ilock);
-	initnsema(&mp->m_growlock, 1, "xfs_grow");
+	mutex_init(&mp->m_growlock);
 	/*
 	 * Initialize the AIL.
 	 */
@@ -174,7 +174,7 @@
 	AIL_LOCK_DESTROY(&mp->m_ail_lock);
 	spinlock_destroy(&mp->m_sb_lock);
 	mutex_destroy(&mp->m_ilock);
-	freesema(&mp->m_growlock);
+	mutex_destroy(&mp->m_growlock);
 	if (mp->m_quotainfo)
 		XFS_QM_DONE(mp);