linux-kernel - [PATCH RFC] nfsd: set missing after_change as before

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Message-Id: <20230724-bz2223560-v1-1-b6da868c0fc6@kernel.org>
Date:   Mon, 24 Jul 2023 10:53:39 -0400
From:   Jeff Layton <jlayton@...nel.org>
To:     Chuck Lever <chuck.lever@...cle.com>, Neil Brown <neilb@...e.de>,
        Olga Kornievskaia <kolga@...app.com>,
        Dai Ngo <Dai.Ngo@...cle.com>, Tom Talpey <tom@...pey.com>
Cc:     linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jeff Layton <jlayton@...nel.org>
Subject: [PATCH RFC] nfsd: set missing after_change as before_change + 1

In the event that we can't fetch post_op_attr attributes, we still need
to set a value for the after_change. The operation has already happened,
so we're not able to return an error at that point, but we do want to
ensure that the client knows that its cache should be invalidated.

If we weren't able to fetch post-op attrs, then just set the
after_change to before_change + 1. The atomic flag should already be
clear in this case.

Suggested-by: Neil Brown <neilb@...e.de>
Signed-off-by: Jeff Layton <jlayton@...nel.org>
---
 fs/nfsd/nfs4proc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 3f6710c9c5c9..f0f318e78630 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -411,7 +411,7 @@ set_change_info(struct nfsd4_change_info *cinfo, struct svc_fh *fhp)
 	if (WARN_ON_ONCE(!fhp->fh_pre_saved))
 		cinfo->before_change = 0;
 	if (!fhp->fh_post_saved)
-		cinfo->after_change = 0;
+		cinfo->after_change = cinfo->before_change + 1;
 }
 
 static __be32

---
base-commit: 97a5d0146ef443df148805a4e9c3c44111f14ab1
change-id: 20230724-bz2223560-5ed6bc3a5db7

Best regards,
-- 
Jeff Layton <jlayton@...nel.org>