[XFS] Clean up xfs_alloc_search_busy() return values.

xfs_alloc_search_busy() returns an index into the busy array if the extent
was found in the array. This is never checked, and the
xfs_alloc_search_busy() does a log force to prevent reuse of the extent
before the free transaction hits the disk. Hence the return value is
useless. Declare the function void and remove the slot number from the
tracing as well.

SGI-PV: 980084
SGI-Modid: xfs-linux-melb:xfs-kern:30796a

Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: Niv Sardi <xaiki@sgi.com>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>

fs/xfs/xfs_alloc.c

@@ -45,7 +45,7 @@
 #define	XFSA_FIXUP_BNO_OK	1
 #define	XFSA_FIXUP_CNT_OK	2
 
-STATIC int
+STATIC void
 xfs_alloc_search_busy(xfs_trans_t *tp,
 		    xfs_agnumber_t agno,
 		    xfs_agblock_t bno,
@@ -64,15 +64,15 @@ ktrace_t *xfs_alloc_trace_buf;
 	xfs_alloc_trace_busy(__func__, s, mp, ag, agb, l, sl, tp, XFS_ALLOC_KTRACE_BUSY, __LINE__)
 #define	TRACE_UNBUSY(__func__,s,ag,sl,tp)	\
 	xfs_alloc_trace_busy(__func__, s, mp, ag, -1, -1, sl, tp, XFS_ALLOC_KTRACE_UNBUSY, __LINE__)
-#define	TRACE_BUSYSEARCH(__func__,s,ag,agb,l,sl,tp)	\
-	xfs_alloc_trace_busy(__func__, s, mp, ag, agb, l, sl, tp, XFS_ALLOC_KTRACE_BUSYSEARCH, __LINE__)
+#define	TRACE_BUSYSEARCH(__func__,s,ag,agb,l,tp)	\
+	xfs_alloc_trace_busy(__func__, s, mp, ag, agb, l, 0, tp, XFS_ALLOC_KTRACE_BUSYSEARCH, __LINE__)
 #else
 #define	TRACE_ALLOC(s,a)
 #define	TRACE_FREE(s,a,b,x,f)
 #define	TRACE_MODAGF(s,a,f)
 #define	TRACE_BUSY(s,a,ag,agb,l,sl,tp)
 #define	TRACE_UNBUSY(fname,s,ag,sl,tp)
-#define	TRACE_BUSYSEARCH(fname,s,ag,agb,l,sl,tp)
+#define	TRACE_BUSYSEARCH(fname,s,ag,agb,l,tp)
 #endif	/* XFS_ALLOC_TRACE */
 
 /*
@@ -2562,9 +2562,10 @@ xfs_alloc_clear_busy(xfs_trans_t *tp,
 
 
 /*
- * returns non-zero if any of (agno,bno):len is in a busy list
+ * If we find the extent in the busy list, force the log out to get the
+ * extent out of the busy list so the caller can use it straight away.
  */
-STATIC int
+STATIC void
 xfs_alloc_search_busy(xfs_trans_t *tp,
 		    xfs_agnumber_t agno,
 		    xfs_agblock_t bno,
@@ -2572,7 +2573,6 @@ xfs_alloc_search_busy(xfs_trans_t *tp,
 {
 	xfs_mount_t		*mp;
 	xfs_perag_busy_t	*bsy;
-	int			n;
 	xfs_agblock_t		uend, bend;
 	xfs_lsn_t		lsn;
 	int			cnt;
@@ -2585,21 +2585,18 @@ xfs_alloc_search_busy(xfs_trans_t *tp,
 	uend = bno + len - 1;
 
 	/* search pagb_list for this slot, skipping open slots */
-	for (bsy = mp->m_perag[agno].pagb_list, n = 0;
-	     cnt; bsy++, n++) {
+	for (bsy = mp->m_perag[agno].pagb_list; cnt; bsy++) {
 
 		/*
 		 * (start1,length1) within (start2, length2)
 		 */
 		if (bsy->busy_tp != NULL) {
 			bend = bsy->busy_start + bsy->busy_length - 1;
-			if ((bno > bend) ||
-			    (uend < bsy->busy_start)) {
+			if ((bno > bend) || (uend < bsy->busy_start)) {
 				cnt--;
 			} else {
 				TRACE_BUSYSEARCH("xfs_alloc_search_busy",
-						 "found1", agno, bno, len, n,
-						 tp);
+					 "found1", agno, bno, len, tp);
 				break;
 			}
 		}
@@ -2610,15 +2607,12 @@ xfs_alloc_search_busy(xfs_trans_t *tp,
 	 * transaction that freed the block
 	 */
 	if (cnt) {
-		TRACE_BUSYSEARCH("xfs_alloc_search_busy", "found", agno, bno, len, n, tp);
+		TRACE_BUSYSEARCH("xfs_alloc_search_busy", "found", agno, bno, len, tp);
 		lsn = bsy->busy_tp->t_commit_lsn;
 		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;
+		TRACE_BUSYSEARCH("xfs_alloc_search_busy", "not-found", agno, bno, len, tp);
 		spin_unlock(&mp->m_perag[agno].pagb_lock);
 	}
-
-	return n;
 }