xfs: merge _xfs_log_force and xfs_log_force

Switch to a single interface for flushing the whole log, which gives
consistent trace point coverage, and removes the unused log_flushed
argument for the previous _xfs_log_force callers.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

fs/xfs/scrub/common.c

@@ -619,7 +619,7 @@ xfs_scrub_checkpoint_log(
 {
 	int			error;
 
-	error = _xfs_log_force(mp, XFS_LOG_SYNC, NULL);
+	error = xfs_log_force(mp, XFS_LOG_SYNC);
 	if (error)
 		return error;
 	xfs_ail_push_all_sync(mp->m_ail);

fs/xfs/xfs_extent_busy.c

@@ -613,8 +613,7 @@ xfs_extent_busy_flush(
 	DEFINE_WAIT		(wait);
 	int			error;
 
-	trace_xfs_log_force(mp, 0, _THIS_IP_);
-	error = _xfs_log_force(mp, XFS_LOG_SYNC, NULL);
+	error = xfs_log_force(mp, XFS_LOG_SYNC);
 	if (error)
 		return;
 

fs/xfs/xfs_log.c

@@ -869,7 +869,7 @@ xfs_log_unmount_write(xfs_mount_t *mp)
 		return 0;
 	}
 
-	error = _xfs_log_force(mp, XFS_LOG_SYNC, NULL);
+	error = xfs_log_force(mp, XFS_LOG_SYNC);
 	ASSERT(error || !(XLOG_FORCED_SHUTDOWN(log)));
 
 #ifdef DEBUG
@@ -3304,16 +3304,16 @@ xlog_state_switch_iclogs(
  *		not in the active nor dirty state.
  */
 int
-_xfs_log_force(
+xfs_log_force(
 	struct xfs_mount	*mp,
-	uint			flags,
-	int			*log_flushed)
+	uint			flags)
 {
 	struct xlog		*log = mp->m_log;
 	struct xlog_in_core	*iclog;
 	xfs_lsn_t		lsn;
 
 	XFS_STATS_INC(mp, xs_log_force);
+	trace_xfs_log_force(mp, 0, _RET_IP_);
 
 	xlog_cil_force(log);
 
@@ -3362,8 +3362,6 @@ _xfs_log_force(
 				if (xlog_state_release_iclog(log, iclog))
 					return -EIO;
 
-				if (log_flushed)
-					*log_flushed = 1;
 				spin_lock(&log->l_icloglock);
 				if (be64_to_cpu(iclog->ic_header.h_lsn) == lsn &&
 				    iclog->ic_state != XLOG_STATE_DIRTY)
@@ -3415,20 +3413,6 @@ no_sleep:
 	return 0;
 }
 
-/*
- * Wrapper for _xfs_log_force(), to be used when caller doesn't care
- * about errors or whether the log was flushed or not. This is the normal
- * interface to use when trying to unpin items or move the log forward.
- */
-void
-xfs_log_force(
-	xfs_mount_t	*mp,
-	uint		flags)
-{
-	trace_xfs_log_force(mp, 0, _RET_IP_);
-	_xfs_log_force(mp, flags, NULL);
-}
-
 /*
  * Force the in-core log to disk for a specific LSN.
  *
@@ -4035,7 +4019,7 @@ xfs_log_force_umount(
 	 * to guarantee this.
 	 */
 	if (!logerror)
-		_xfs_log_force(mp, XFS_LOG_SYNC, NULL);
+		xfs_log_force(mp, XFS_LOG_SYNC);
 
 	/*
 	 * mark the filesystem and the as in a shutdown state and wake

fs/xfs/xfs_log.h

@@ -129,11 +129,7 @@ xfs_lsn_t xfs_log_done(struct xfs_mount *mp,
 		       struct xlog_ticket *ticket,
 		       struct xlog_in_core **iclog,
 		       bool regrant);
-int	  _xfs_log_force(struct xfs_mount *mp,
-			 uint		flags,
-			 int		*log_forced);
-void	  xfs_log_force(struct xfs_mount	*mp,
-			uint			flags);
+int	  xfs_log_force(struct xfs_mount *mp, uint flags);
 int	  _xfs_log_force_lsn(struct xfs_mount *mp,
 			     xfs_lsn_t		lsn,
 			     uint		flags,