[PATCH 24/29] xfs: support nowait for xfs_buf_read_map()

[Hao Xu <hao.xu@linux.dev>]

From: Hao Xu <howeyxu@tencent.com>

This causes xfstests generic/232 hung in umount process, waiting for ail
push, so I comment it for now, need some hints from xfs folks.
Not a real patch.

Signed-off-by: Hao Xu <howeyxu@tencent.com>
---
 fs/xfs/xfs_buf.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c
index cdad80e1ae25..284962a9f31a 100644
--- a/fs/xfs/xfs_buf.c
+++ b/fs/xfs/xfs_buf.c
@@ -828,6 +828,13 @@ xfs_buf_read_map(
 	trace_xfs_buf_read(bp, flags, _RET_IP_);
 
 	if (!(bp->b_flags & XBF_DONE)) {
+//		/*
+//		 * Let's bypass the _xfs_buf_read() for now
+//		 */
+//		if (flags & XBF_NOWAIT) {
+//			xfs_buf_relse(bp);
+//			return -EAGAIN;
+//		}
 		/* Initiate the buffer read and wait. */
 		XFS_STATS_INC(target->bt_mount, xb_get_read);
 		bp->b_ops = ops;
-- 
2.25.1