[PATCH 21/29] xfs: return -EAGAIN when bulk memory allocation fails in nowait case

[Hao Xu]

From: Hao Xu <howeyxu@xxxxxxxxxxx>

Rather than wait for a moment and retry, we return -EAGAIN when we fail
to allocate bulk memory in xfs_buf_alloc_pages() in nowait case.

Signed-off-by: Hao Xu <howeyxu@xxxxxxxxxxx>
---
 fs/xfs/xfs_buf.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c
index a6e6e64ff940..eb3cd7702545 100644
--- a/fs/xfs/xfs_buf.c
+++ b/fs/xfs/xfs_buf.c
@@ -404,6 +404,11 @@ xfs_buf_alloc_pages(
 		if (filled != last)
 			continue;
 
+		if (nowait) {
+			xfs_buf_free_pages(bp);
+			return -EAGAIN;
+		}
+
 		if (flags & XBF_READ_AHEAD) {
 			xfs_buf_free_pages(bp);
 			return -ENOMEM;
-- 
2.25.1