[PATCH 15/29] xfs: don't wait for free space in xlog_grant_head_check() in nowait case

[Hao Xu]

From: Hao Xu <howeyxu@xxxxxxxxxxx>

Don't sleep and wait for more space for a log ticket in
xlog_grant_head_check() when it is in nowait case.

Signed-off-by: Hao Xu <howeyxu@xxxxxxxxxxx>
---
 fs/xfs/xfs_log.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c
index 90fbb1c0eca2..a2aabdd42a29 100644
--- a/fs/xfs/xfs_log.c
+++ b/fs/xfs/xfs_log.c
@@ -341,7 +341,8 @@ xlog_grant_head_check(
 	struct xlog		*log,
 	struct xlog_grant_head	*head,
 	struct xlog_ticket	*tic,
-	int			*need_bytes)
+	int			*need_bytes,
+	bool			nowait)
 {
 	int			free_bytes;
 	int			error = 0;
@@ -360,13 +361,15 @@ xlog_grant_head_check(
 		spin_lock(&head->lock);
 		if (!xlog_grant_head_wake(log, head, &free_bytes) ||
 		    free_bytes < *need_bytes) {
-			error = xlog_grant_head_wait(log, head, tic,
-						     *need_bytes);
+			error = nowait ?
+				-EAGAIN : xlog_grant_head_wait(log, head, tic,
+							       *need_bytes);
 		}
 		spin_unlock(&head->lock);
 	} else if (free_bytes < *need_bytes) {
 		spin_lock(&head->lock);
-		error = xlog_grant_head_wait(log, head, tic, *need_bytes);
+		error = nowait ? -EAGAIN : xlog_grant_head_wait(log, head, tic,
+								*need_bytes);
 		spin_unlock(&head->lock);
 	}
 
@@ -428,7 +431,7 @@ xfs_log_regrant(
 	trace_xfs_log_regrant(log, tic);
 
 	error = xlog_grant_head_check(log, &log->l_write_head, tic,
-				      &need_bytes);
+				      &need_bytes, false);
 	if (error)
 		goto out_error;
 
@@ -487,7 +490,7 @@ xfs_log_reserve(
 	trace_xfs_log_reserve(log, tic);
 
 	error = xlog_grant_head_check(log, &log->l_reserve_head, tic,
-				      &need_bytes);
+				      &need_bytes, nowait);
 	if (error)
 		goto out_error;
 
-- 
2.25.1