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authorAndy Adamson <andros@netapp.com>2009-04-03 08:28:35 +0300
committerJ. Bruce Fields <bfields@citi.umich.edu>2009-04-03 17:41:19 -0700
commitbf864a31d50e3e94d6e76537b97d664913906ff8 (patch)
tree8de829d0cdc0c88fe523fc4a288b8e16eedc6a2e /fs/nfsd/nfs4proc.c
parent38eb76a54d803e6792816623651b1a9cb85f8d01 (diff)
downloadlinux-bf864a31d50e3e94d6e76537b97d664913906ff8.tar.bz2
nfsd41: non-page DRC for solo sequence responses
A session inactivity time compound (lease renewal) or a compound where the sequence operation has sa_cachethis set to FALSE do not require any pages to be held in the v4.1 DRC. This is because struct nfsd4_slot is already caching the session information. Add logic to the nfs41 server to not cache response pages for solo sequence responses. Return nfserr_replay_uncached_rep on the operation following the sequence operation when sa_cachethis is FALSE. Signed-off-by: Andy Adamson <andros@netapp.com> Signed-off-by: Benny Halevy <bhalevy@panasas.com> [nfsd41: use cstate session in nfsd4_replay_cache_entry] [nfsd41: rename nfsd4_no_page_in_cache] [nfsd41 rename nfsd4_enc_no_page_replay] [nfsd41 nfsd4_is_solo_sequence] [nfsd41 change nfsd4_not_cached return] Signed-off-by: Andy Adamson <andros@netapp.com> [changed return type to bool] Signed-off-by: Benny Halevy <bhalevy@panasas.com> [nfsd41 drop parens in nfsd4_is_solo_sequence call] Signed-off-by: Andy Adamson <andros@netapp.com> [changed "== 0" to "!"] Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Diffstat (limited to 'fs/nfsd/nfs4proc.c')
-rw-r--r--fs/nfsd/nfs4proc.c34
1 files changed, 32 insertions, 2 deletions
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 9e2ee75e0f7c..ae21a4efe36c 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -828,6 +828,34 @@ static struct nfsd4_operation nfsd4_ops[];
static const char *nfsd4_op_name(unsigned opnum);
/*
+ * This is a replay of a compound for which no cache entry pages
+ * were used. Encode the sequence operation, and if cachethis is FALSE
+ * encode the uncache rep error on the next operation.
+ */
+static __be32
+nfsd4_enc_uncached_replay(struct nfsd4_compoundargs *args,
+ struct nfsd4_compoundres *resp)
+{
+ struct nfsd4_op *op;
+
+ dprintk("--> %s resp->opcnt %d ce_cachethis %u \n", __func__,
+ resp->opcnt, resp->cstate.slot->sl_cache_entry.ce_cachethis);
+
+ /* Encode the replayed sequence operation */
+ BUG_ON(resp->opcnt != 1);
+ op = &args->ops[resp->opcnt - 1];
+ nfsd4_encode_operation(resp, op);
+
+ /*return nfserr_retry_uncached_rep in next operation. */
+ if (resp->cstate.slot->sl_cache_entry.ce_cachethis == 0) {
+ op = &args->ops[resp->opcnt++];
+ op->status = nfserr_retry_uncached_rep;
+ nfsd4_encode_operation(resp, op);
+ }
+ return op->status;
+}
+
+/*
* Enforce NFSv4.1 COMPOUND ordering rules.
*
* TODO:
@@ -895,7 +923,6 @@ nfsd4_proc_compound(struct svc_rqst *rqstp,
dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
resp->opcnt, args->opcnt, op->opnum,
nfsd4_op_name(op->opnum));
-
/*
* The XDR decode routines may have pre-set op->status;
* for example, if there is a miscellaneous XDR error
@@ -939,7 +966,10 @@ 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;
+ if (nfsd4_not_cached(resp))
+ status = nfsd4_enc_uncached_replay(args, resp);
+ else
+ status = op->status;
goto out;
}
if (op->status == nfserr_replay_me) {