From: Hao Xu <howeyxu@tencent.com>

To enforce nowait semantics, error out -EAGAIN if atime needs to be
updated.

Signed-off-by: Hao Xu <howeyxu@tencent.com>
---
 fs/inode.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/inode.c b/fs/inode.c
index e83b836f2d09..32d81be65cf9 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -1970,6 +1970,9 @@ int touch_atime(const struct path *path, bool nowait)
 	if (!atime_needs_update(path, inode))
 		return 0;
 
+	if (nowait)
+		return -EAGAIN;
+
 	if (!sb_start_write_trylock(inode->i_sb))
 		return 0;
 
-- 
2.25.1

On Sun, Aug 27, 2023 at 09:28:33PM +0800, Hao Xu wrote:
> From: Hao Xu <howeyxu@tencent.com>
> 
> To enforce nowait semantics, error out -EAGAIN if atime needs to be
> updated.

Squash this into patch 6.  Otherwise patch 6 makes no sense.