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authorScott Mayhew <smayhew@redhat.com>2019-10-09 15:11:37 -0400
committerJ. Bruce Fields <bfields@redhat.com>2019-10-09 16:39:31 -0400
commit6e73e92b155c868ff7fce9d108839668caf1d9be (patch)
tree9897fb3e0543c340c2ab4012174875d562f34762 /fs/nfsd
parent832b2cb955437dcfe9b8f08e5f37303c9097fc87 (diff)
downloadlinux-6e73e92b155c868ff7fce9d108839668caf1d9be.tar.bz2
nfsd4: fix up replay_matches_cache()
When running an nfs stress test, I see quite a few cached replies that don't match up with the actual request. The first comment in replay_matches_cache() makes sense, but the code doesn't seem to match... fix it. This isn't exactly a bugfix, as the server isn't required to catch every case of a false retry. So, we may as well do this, but if this is fixing a problem then that suggests there's a client bug. Fixes: 53da6a53e1d4 ("nfsd4: catch some false session retries") Signed-off-by: Scott Mayhew <smayhew@redhat.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs/nfsd')
-rw-r--r--fs/nfsd/nfs4state.c15
1 files changed, 10 insertions, 5 deletions
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index befcafc43c74..369e574c5092 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -3548,12 +3548,17 @@ static bool replay_matches_cache(struct svc_rqst *rqstp,
(bool)seq->cachethis)
return false;
/*
- * If there's an error than the reply can have fewer ops than
- * the call. But if we cached a reply with *more* ops than the
- * call you're sending us now, then this new call is clearly not
- * really a replay of the old one:
+ * If there's an error then the reply can have fewer ops than
+ * the call.
*/
- if (slot->sl_opcnt < argp->opcnt)
+ if (slot->sl_opcnt < argp->opcnt && !slot->sl_status)
+ return false;
+ /*
+ * But if we cached a reply with *more* ops than the call you're
+ * sending us now, then this new call is clearly not really a
+ * replay of the old one:
+ */
+ if (slot->sl_opcnt > argp->opcnt)
return false;
/* This is the only check explicitly called by spec: */
if (!same_creds(&rqstp->rq_cred, &slot->sl_cred))