nfsd41: nfsd DRC logic

Replay a request in nfsd4_sequence.
Add a minorversion to struct nfsd4_compound_state.

Pass the current slot to nfs4svc_encode_compound res via struct
nfsd4_compoundres to set an NFSv4.1 DRC entry.

Signed-off-by: Andy Adamson<andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[nfsd41: use bool inuse for slot state]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[nfsd41: use cstate session in nfs4svc_encode_compoundres]
[nfsd41 replace nfsd4_set_cache_entry]
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

4 files changed, 25 insertions, 0 deletions

diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index ec51936d2ce2..9e2ee75e0f7c 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -936,6 +936,12 @@ nfsd4_proc_compound(struct svc_rqst *rqstp,
                         BUG_ON(op->status == nfs_ok);
 
 encode_op:
+                /* Only from SEQUENCE or CREATE_SESSION */
+                if (resp->cstate.status == nfserr_replay_cache) {
+                        dprintk("%s NFS4.1 replay from cache\n", __func__);
+                        status = op->status;
+                        goto out;
+                }
                 if (op->status == nfserr_replay_me) {
                         op->replay = &cstate->replay_owner->so_replay;
                         nfsd4_encode_replay(resp, op);
@@ -964,6 +970,7 @@ encode_op:
                 status = nfserr_jukebox;
         }
 
+        resp->cstate.status = status;
         fh_put(&resp->cstate.current_fh);
         fh_put(&resp->cstate.save_fh);
         BUG_ON(resp->cstate.replay_owner);
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index a37b91dab1bf..e20d4345040f 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -989,6 +989,8 @@ nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp)
         }
 
         resp->rqstp->rq_resused = entry->ce_resused;
+        resp->opcnt = entry->ce_opcnt;
+        resp->cstate.iovlen = entry->ce_datav.iov_len + entry->ce_rpchdrlen;
         status = entry->ce_status;
 
         return status;
@@ -1214,6 +1216,10 @@ nfsd4_sequence(struct svc_rqst *rqstp,
         if (status == nfserr_replay_cache) {
                 cstate->slot = slot;
                 cstate->session = session;
+                /* Return the cached reply status and set cstate->status
+                 * for nfsd4_svc_encode_compoundres processing*/
+                status = nfsd4_replay_cache_entry(resp);
+                cstate->status = nfserr_replay_cache;
                 goto replay_cache;
         }
         if (status)
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 8556575480ce..09415bcf078e 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -3049,6 +3049,17 @@ nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compo
                 iov = &rqstp->rq_res.head[0];
         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
         BUG_ON(iov->iov_len > PAGE_SIZE);
+        if (resp->cstate.slot != NULL) {
+                if (resp->cstate.status == nfserr_replay_cache) {
+                        iov->iov_len = resp->cstate.iovlen;
+                } else {
+                        nfsd4_store_cache_entry(resp);
+                        dprintk("%s: SET SLOT STATE TO AVAILABLE\n", __func__);
+                        resp->cstate.slot->sl_inuse = 0;
+                }
+                if (resp->cstate.session)
+                        nfsd4_put_session(resp->cstate.session);
+        }
         return 1;
 }
 
diff --git a/include/linux/nfsd/xdr4.h b/include/linux/nfsd/xdr4.h
index d091684325af..69cb467cb720 100644
--- a/include/linux/nfsd/xdr4.h
+++ b/include/linux/nfsd/xdr4.h
@@ -52,6 +52,7 @@ struct nfsd4_compound_state {
         struct nfsd4_session    *session;
         struct nfsd4_slot       *slot;
         __be32                  *statp;
+        size_t                  iovlen;
         u32                     status;
 };