nfsd41: sequence operation

Implement the sequence operation conforming to
http://tools.ietf.org/html/draft-ietf-nfsv4-minorversion1-26

Check for stale clientid (as derived from the sessionid).
Enforce slotid range and exactly-once semantics using
the slotid and seqid.

If everything went well renew the client lease and
mark the slot INPROGRESS.

Add a struct nfsd4_slot pointer to struct nfsd4_compound_state.
To be used for sessions DRC replay.

[nfsd41: rename sequence catchthis to cachethis]
Signed-off-by: Andy Adamson<andros@netapp.com>
[pulled some code to set cstate->slot from "nfsd DRC logic"]
[use sessionid_lock spin lock]
[nfsd41: use bool inuse for slot state]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[nfsd: add a struct nfsd4_slot pointer to struct nfsd4_compound_state]
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[nfsd41: add nfsd4_session pointer to nfsd4_compound_state]
[nfsd41: set cstate session]
[nfsd41: use cstate session in nfsd4_sequence]
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[simplify nfsd4_encode_sequence error handling]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

1 files changed, 30 insertions, 3 deletions

diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index bebf6d249069..8556575480ce 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -1113,7 +1113,16 @@ static __be32
 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
                       struct nfsd4_sequence *seq)
 {
-        return nfserr_opnotsupp;        /* stub */
+        DECODE_HEAD;
+
+        READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
+        COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
+        READ32(seq->seqid);
+        READ32(seq->slotid);
+        READ32(seq->maxslots);
+        READ32(seq->cachethis);
+
+        DECODE_TAIL;
 }
 
 static __be32
@@ -2828,8 +2837,26 @@ static __be32
 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, int nfserr,
                       struct nfsd4_sequence *seq)
 {
-        /* stub */
-        return nfserr;
+        ENCODE_HEAD;
+
+        if (nfserr)
+                return nfserr;
+
+        RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
+        WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
+        WRITE32(seq->seqid);
+        WRITE32(seq->slotid);
+        WRITE32(seq->maxslots);
+        /*
+         * FIXME: for now:
+         *   target_maxslots = maxslots
+         *   status_flags = 0
+         */
+        WRITE32(seq->maxslots);
+        WRITE32(0);
+
+        ADJUST_ARGS();
+        return 0;
 }
 
 static __be32