[XFS] Unwrap XFS_SB_LOCK.

Un-obfuscate XFS_SB_LOCK, remove XFS_SB_LOCK->mutex_lock->spin_lock
macros, call spin_lock directly, remove extraneous cookie holdover from
old xfs code, and change lock type to spinlock_t.

SGI-PV: 970382
SGI-Modid: xfs-linux-melb:xfs-kern:29746a

Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
Signed-off-by: Donald Douwsma <donaldd@sgi.com>
Signed-off-by: Tim Shimmin <tes@sgi.com>
diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c
index c92d5b8..b8de7f3 100644
--- a/fs/xfs/xfs_fsops.c
+++ b/fs/xfs/xfs_fsops.c
@@ -462,15 +462,13 @@
 	xfs_mount_t		*mp,
 	xfs_fsop_counts_t	*cnt)
 {
-	unsigned long	s;
-
 	xfs_icsb_sync_counters_flags(mp, XFS_ICSB_LAZY_COUNT);
-	s = XFS_SB_LOCK(mp);
+	spin_lock(&mp->m_sb_lock);
 	cnt->freedata = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
 	cnt->freertx = mp->m_sb.sb_frextents;
 	cnt->freeino = mp->m_sb.sb_ifree;
 	cnt->allocino = mp->m_sb.sb_icount;
-	XFS_SB_UNLOCK(mp, s);
+	spin_unlock(&mp->m_sb_lock);
 	return 0;
 }
 
@@ -497,7 +495,6 @@
 {
 	__int64_t		lcounter, delta, fdblks_delta;
 	__uint64_t		request;
-	unsigned long		s;
 
 	/* If inval is null, report current values and return */
 	if (inval == (__uint64_t *)NULL) {
@@ -515,7 +512,7 @@
 	 * problem. we needto work out if we are freeing or allocation
 	 * blocks first, then we can do the modification as necessary.
 	 *
-	 * We do this under the XFS_SB_LOCK so that if we are near
+	 * We do this under the m_sb_lock so that if we are near
 	 * ENOSPC, we will hold out any changes while we work out
 	 * what to do. This means that the amount of free space can
 	 * change while we do this, so we need to retry if we end up
@@ -526,7 +523,7 @@
 	 * enabled, disabled or even compiled in....
 	 */
 retry:
-	s = XFS_SB_LOCK(mp);
+	spin_lock(&mp->m_sb_lock);
 	xfs_icsb_sync_counters_flags(mp, XFS_ICSB_SB_LOCKED);
 
 	/*
@@ -569,7 +566,7 @@
 		outval->resblks = mp->m_resblks;
 		outval->resblks_avail = mp->m_resblks_avail;
 	}
-	XFS_SB_UNLOCK(mp, s);
+	spin_unlock(&mp->m_sb_lock);
 
 	if (fdblks_delta) {
 		/*