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From:   Trond Myklebust <trondmy@gmail.com>
To:     Anna Schumaker <Anna.Schumaker@netapp.com>
Cc:     linux-nfs@vger.kernel.org
Subject: [PATCH 5/9] NFSv4: Add a helper to increment stateid seqids
Date:   Mon,  9 Sep 2019 10:01:00 -0400
Message-Id: <20190909140104.78818-5-trond.myklebust@hammerspace.com>
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Add a helper function to increment stateid seqids according to the
rules specified in RFC5661 Section 8.2.2.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
---
 fs/nfs/nfs4_fs.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h
index 3564da1ba8a1..e8f74ed98e42 100644
--- a/fs/nfs/nfs4_fs.h
+++ b/fs/nfs/nfs4_fs.h
@@ -574,6 +574,15 @@ static inline bool nfs4_stateid_is_newer(const nfs4_stateid *s1, const nfs4_stat
 	return (s32)(be32_to_cpu(s1->seqid) - be32_to_cpu(s2->seqid)) > 0;
 }
 
+static inline void nfs4_stateid_seqid_inc(nfs4_stateid *s1)
+{
+	u32 seqid = be32_to_cpu(s1->seqid);
+
+	if (++seqid == 0)
+		++seqid;
+	s1->seqid = cpu_to_be32(seqid);
+}
+
 static inline bool nfs4_valid_open_stateid(const struct nfs4_state *state)
 {
 	return test_bit(NFS_STATE_RECOVERY_FAILED, &state->flags) == 0;
-- 
2.21.0