xfs: merge _xfs_log_force_lsn and xfs_log_force_lsn

Switch to a single interface for flushing the log to a specific LSN, which
gives consistent trace point coverage and a less confusing interface.

The was only a single user of the previous xfs_log_force_lsn function,
which now also passes a NULL log_flushed argument.

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>
diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c
index 3ce17e7..cb50dd7 100644
--- a/fs/xfs/xfs_log.c
+++ b/fs/xfs/xfs_log.c
@@ -3429,7 +3429,7 @@ xfs_log_force(
  * sv.
  */
 int
-_xfs_log_force_lsn(
+xfs_log_force_lsn(
 	struct xfs_mount	*mp,
 	xfs_lsn_t		lsn,
 	uint			flags,
@@ -3442,6 +3442,7 @@ _xfs_log_force_lsn(
 	ASSERT(lsn != 0);
 
 	XFS_STATS_INC(mp, xs_log_force);
+	trace_xfs_log_force(mp, lsn, _RET_IP_);
 
 	lsn = xlog_cil_force_lsn(log, lsn);
 	if (lsn == NULLCOMMITLSN)
@@ -3539,21 +3540,6 @@ _xfs_log_force_lsn(
 }
 
 /*
- * Wrapper for _xfs_log_force_lsn(), 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_lsn(
-	xfs_mount_t	*mp,
-	xfs_lsn_t	lsn,
-	uint		flags)
-{
-	trace_xfs_log_force(mp, lsn, _RET_IP_);
-	_xfs_log_force_lsn(mp, lsn, flags, NULL);
-}
-
-/*
  * Called when we want to mark the current iclog as being ready to sync to
  * disk.
  */