[XFS] Unwrap pagb_lock.

Un-obfuscate pagb_lock, remove 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:29743a
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
Signed-off-by: Donald Douwsma <donaldd@sgi.com>
Signed-off-by: Tim Shimmin <tes@sgi.com>

fs/xfs/xfs_ag.h

@@ -193,7 +193,7 @@ typedef struct xfs_perag
 	xfs_agino_t	pagi_count;	/* number of allocated inodes */
 	int		pagb_count;	/* pagb slots in use */
 #ifdef __KERNEL__
-	lock_t		pagb_lock;	/* lock for pagb_list */
+	spinlock_t	pagb_lock;	/* lock for pagb_list */
 #endif
 	xfs_perag_busy_t *pagb_list;	/* unstable blocks */
 	atomic_t        pagf_fstrms;    /* # of filestreams active in this AG */

fs/xfs/xfs_alloc.c

@@ -2500,10 +2500,9 @@ xfs_alloc_mark_busy(xfs_trans_t *tp,
 	xfs_mount_t		*mp;
 	xfs_perag_busy_t	*bsy;
 	int			n;
-	SPLDECL(s);
 
 	mp = tp->t_mountp;
-	s = mutex_spinlock(&mp->m_perag[agno].pagb_lock);
+	spin_lock(&mp->m_perag[agno].pagb_lock);
 
 	/* search pagb_list for an open slot */
 	for (bsy = mp->m_perag[agno].pagb_list, n = 0;
@@ -2533,7 +2532,7 @@ xfs_alloc_mark_busy(xfs_trans_t *tp,
 		xfs_trans_set_sync(tp);
 	}
 
-	mutex_spinunlock(&mp->m_perag[agno].pagb_lock, s);
+	spin_unlock(&mp->m_perag[agno].pagb_lock);
 }
 
 void
@@ -2543,11 +2542,10 @@ xfs_alloc_clear_busy(xfs_trans_t *tp,
 {
 	xfs_mount_t		*mp;
 	xfs_perag_busy_t	*list;
-	SPLDECL(s);
 
 	mp = tp->t_mountp;
 
-	s = mutex_spinlock(&mp->m_perag[agno].pagb_lock);
+	spin_lock(&mp->m_perag[agno].pagb_lock);
 	list = mp->m_perag[agno].pagb_list;
 
 	ASSERT(idx < XFS_PAGB_NUM_SLOTS);
@@ -2559,7 +2557,7 @@ xfs_alloc_clear_busy(xfs_trans_t *tp,
 		TRACE_UNBUSY("xfs_alloc_clear_busy", "missing", agno, idx, tp);
 	}
 
-	mutex_spinunlock(&mp->m_perag[agno].pagb_lock, s);
+	spin_unlock(&mp->m_perag[agno].pagb_lock);
 }
 
 
@@ -2578,11 +2576,10 @@ xfs_alloc_search_busy(xfs_trans_t *tp,
 	xfs_agblock_t		uend, bend;
 	xfs_lsn_t		lsn;
 	int			cnt;
-	SPLDECL(s);
 
 	mp = tp->t_mountp;
 
-	s = mutex_spinlock(&mp->m_perag[agno].pagb_lock);
+	spin_lock(&mp->m_perag[agno].pagb_lock);
 	cnt = mp->m_perag[agno].pagb_count;
 
 	uend = bno + len - 1;
@@ -2615,12 +2612,12 @@ xfs_alloc_search_busy(xfs_trans_t *tp,
 	if (cnt) {
 		TRACE_BUSYSEARCH("xfs_alloc_search_busy", "found", agno, bno, len, n, tp);
 		lsn = bsy->busy_tp->t_commit_lsn;
-		mutex_spinunlock(&mp->m_perag[agno].pagb_lock, s);
+		spin_unlock(&mp->m_perag[agno].pagb_lock);
 		xfs_log_force(mp, lsn, XFS_LOG_FORCE|XFS_LOG_SYNC);
 	} else {
 		TRACE_BUSYSEARCH("xfs_alloc_search_busy", "not-found", agno, bno, len, n, tp);
 		n = -1;
-		mutex_spinunlock(&mp->m_perag[agno].pagb_lock, s);
+		spin_unlock(&mp->m_perag[agno].pagb_lock);
 	}
 
 	return n;