[XFS] clean up stale references to semaphores

A lot of code has been converted away from semaphores, but there are still
comments that reference semaphore behaviour. The log code is the worst
offender. Update the comments to reflect what the code really does now.

SGI-PV: 981498

SGI-Modid: xfs-linux-melb:xfs-kern:31814a

Signed-off-by: David Chinner <david@fromorbit.com>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
diff --git a/fs/xfs/xfs_log_priv.h b/fs/xfs/xfs_log_priv.h
index 6245913..7dcf11e 100644
--- a/fs/xfs/xfs_log_priv.h
+++ b/fs/xfs/xfs_log_priv.h
@@ -241,7 +241,7 @@
 } xlog_res_t;
 
 typedef struct xlog_ticket {
-	sv_t		   t_sema;	 /* sleep on this semaphore      : 20 */
+	sv_t		   t_wait;	 /* ticket wait queue            : 20 */
 	struct xlog_ticket *t_next;	 /*			         :4|8 */
 	struct xlog_ticket *t_prev;	 /*				 :4|8 */
 	xlog_tid_t	   t_tid;	 /* transaction identifier	 : 4  */
@@ -314,7 +314,7 @@
  *	xlog_rec_header_t into the reserved space.
  * - ic_data follows, so a write to disk can start at the beginning of
  *	the iclog.
- * - ic_forcesema is used to implement synchronous forcing of the iclog to disk.
+ * - ic_forcewait is used to implement synchronous forcing of the iclog to disk.
  * - ic_next is the pointer to the next iclog in the ring.
  * - ic_bp is a pointer to the buffer used to write this incore log to disk.
  * - ic_log is a pointer back to the global log structure.
@@ -339,8 +339,8 @@
  * and move everything else out to subsequent cachelines.
  */
 typedef struct xlog_iclog_fields {
-	sv_t			ic_forcesema;
-	sv_t			ic_writesema;
+	sv_t			ic_force_wait;
+	sv_t			ic_write_wait;
 	struct xlog_in_core	*ic_next;
 	struct xlog_in_core	*ic_prev;
 	struct xfs_buf		*ic_bp;
@@ -377,8 +377,8 @@
 /*
  * Defines to save our code from this glop.
  */
-#define	ic_forcesema	hic_fields.ic_forcesema
-#define ic_writesema	hic_fields.ic_writesema
+#define	ic_force_wait	hic_fields.ic_force_wait
+#define ic_write_wait	hic_fields.ic_write_wait
 #define	ic_next		hic_fields.ic_next
 #define	ic_prev		hic_fields.ic_prev
 #define	ic_bp		hic_fields.ic_bp