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authorJ. Bruce Fields <bfields@redhat.com>2012-02-13 16:13:41 -0500
committerJ. Bruce Fields <bfields@redhat.com>2012-02-13 16:15:18 -0500
commitf6d82485e9a947ae19bb29e72644f4c6f27d5b89 (patch)
tree9bb1482584904710aab722b6c9b2b5e5b49780eb /fs/nfsd
parent508f92275624fc755104b17945bdc822936f1918 (diff)
nfsd4: fix sessions slotid wraparound logic
From RFC 5661 2.10.6.1: "If the previous sequence ID was 0xFFFFFFFF, then the next request for the slot MUST have the sequence ID set to zero." While we're there, delete some redundant comments. Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs/nfsd')
-rw-r--r--fs/nfsd/nfs4state.c7
1 files changed, 1 insertions, 6 deletions
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index e8c98f00967..2095dbb2923 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -1575,16 +1575,11 @@ check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse)
else
return nfserr_seq_misordered;
}
- /* Normal */
+ /* Note unsigned 32-bit arithmetic handles wraparound: */
if (likely(seqid == slot_seqid + 1))
return nfs_ok;
- /* Replay */
if (seqid == slot_seqid)
return nfserr_replay_cache;
- /* Wraparound */
- if (seqid == 1 && (slot_seqid + 1) == 0)
- return nfs_ok;
- /* Misordered replay or misordered new request */
return nfserr_seq_misordered;
}