NFSD: Invoke svc_encode_result_payload() in "read" NFSD encoders
Have the NFSD encoders annotate the boundaries of every
direct-data-placement eligible result data payload. Then change
svcrdma to use that annotation instead of the xdr->page_len
when handling Write chunks.
For NFSv4 on RDMA, that enables the ability to recognize multiple
result payloads per compound. This is a pre-requisite for supporting
multiple Write chunks per RPC transaction.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
diff --git a/fs/nfsd/nfsxdr.c b/fs/nfsd/nfsxdr.c
index 8a288c8..9e00a90 100644
--- a/fs/nfsd/nfsxdr.c
+++ b/fs/nfsd/nfsxdr.c
@@ -469,6 +469,7 @@ int
nfssvc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p)
{
struct nfsd_readlinkres *resp = rqstp->rq_resp;
+ struct kvec *head = rqstp->rq_res.head;
*p++ = resp->status;
if (resp->status != nfs_ok)
@@ -483,6 +484,8 @@ nfssvc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p)
*p = 0;
rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
}
+ if (svc_encode_result_payload(rqstp, head->iov_len, resp->len))
+ return 0;
return 1;
}
@@ -490,6 +493,7 @@ int
nfssvc_encode_readres(struct svc_rqst *rqstp, __be32 *p)
{
struct nfsd_readres *resp = rqstp->rq_resp;
+ struct kvec *head = rqstp->rq_res.head;
*p++ = resp->status;
if (resp->status != nfs_ok)
@@ -507,6 +511,8 @@ nfssvc_encode_readres(struct svc_rqst *rqstp, __be32 *p)
*p = 0;
rqstp->rq_res.tail[0].iov_len = 4 - (resp->count&3);
}
+ if (svc_encode_result_payload(rqstp, head->iov_len, resp->count))
+ return 0;
return 1;
}