This is a note to let you know that I've just added the patch titled
NFSD: Invoke svc_encode_result_payload() in "read" NFSD encoders
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
nfsd-invoke-svc_encode_result_payload-in-read-nfsd-e.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 95b9e93785e76fe0fe5847d62e9ebfb02d04b225
Author: Chuck Lever <chuck.lever@xxxxxxxxxx>
Date: Thu Nov 5 10:24:19 2020 -0500
NFSD: Invoke svc_encode_result_payload() in "read" NFSD encoders
[ Upstream commit 76e5492b161f555c0fb69cad9eb39a7d8467f5fe ]
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@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/nfsd/nfs3xdr.c b/fs/nfsd/nfs3xdr.c
index 716566da400e1..27b24823f7c42 100644
--- a/fs/nfsd/nfs3xdr.c
+++ b/fs/nfsd/nfs3xdr.c
@@ -707,6 +707,7 @@ int
nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p)
{
struct nfsd3_readlinkres *resp = rqstp->rq_resp;
+ struct kvec *head = rqstp->rq_res.head;
*p++ = resp->status;
p = encode_post_op_attr(rqstp, p, &resp->fh);
@@ -720,6 +721,8 @@ nfs3svc_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;
} else
return xdr_ressize_check(rqstp, p);
@@ -730,6 +733,7 @@ int
nfs3svc_encode_readres(struct svc_rqst *rqstp, __be32 *p)
{
struct nfsd3_readres *resp = rqstp->rq_resp;
+ struct kvec *head = rqstp->rq_res.head;
*p++ = resp->status;
p = encode_post_op_attr(rqstp, p, &resp->fh);
@@ -746,6 +750,9 @@ nfs3svc_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;
} else
return xdr_ressize_check(rqstp, p);
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 9971d3c295731..4b3344296ed0e 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -3770,8 +3770,8 @@ static __be32 nfsd4_encode_splice_read(
{
struct xdr_stream *xdr = &resp->xdr;
struct xdr_buf *buf = xdr->buf;
+ int status, space_left;
u32 eof;
- int space_left;
__be32 nfserr;
__be32 *p = xdr->p - 2;
@@ -3782,14 +3782,13 @@ static __be32 nfsd4_encode_splice_read(
nfserr = nfsd_splice_read(read->rd_rqstp, read->rd_fhp,
file, read->rd_offset, &maxcount, &eof);
read->rd_length = maxcount;
- if (nfserr) {
- /*
- * nfsd_splice_actor may have already messed with the
- * page length; reset it so as not to confuse
- * xdr_truncate_encode:
- */
- buf->page_len = 0;
- return nfserr;
+ if (nfserr)
+ goto out_err;
+ status = svc_encode_result_payload(read->rd_rqstp,
+ buf->head[0].iov_len, maxcount);
+ if (status) {
+ nfserr = nfserrno(status);
+ goto out_err;
}
*(p++) = htonl(eof);
@@ -3820,6 +3819,15 @@ static __be32 nfsd4_encode_splice_read(
xdr->end = (__be32 *)((void *)xdr->end + space_left);
return 0;
+
+out_err:
+ /*
+ * nfsd_splice_actor may have already messed with the
+ * page length; reset it so as not to confuse
+ * xdr_truncate_encode in our caller.
+ */
+ buf->page_len = 0;
+ return nfserr;
}
static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
@@ -3911,6 +3919,7 @@ nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd
int zero = 0;
struct xdr_stream *xdr = &resp->xdr;
int length_offset = xdr->buf->len;
+ int status;
__be32 *p;
p = xdr_reserve_space(xdr, 4);
@@ -3931,9 +3940,13 @@ nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd
(char *)p, &maxcount);
if (nfserr == nfserr_isdir)
nfserr = nfserr_inval;
- if (nfserr) {
- xdr_truncate_encode(xdr, length_offset);
- return nfserr;
+ if (nfserr)
+ goto out_err;
+ status = svc_encode_result_payload(readlink->rl_rqstp, length_offset,
+ maxcount);
+ if (status) {
+ nfserr = nfserrno(status);
+ goto out_err;
}
wire_count = htonl(maxcount);
@@ -3943,6 +3956,10 @@ nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd
write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
&zero, 4 - (maxcount&3));
return 0;
+
+out_err:
+ xdr_truncate_encode(xdr, length_offset);
+ return nfserr;
}
static __be32
diff --git a/fs/nfsd/nfsxdr.c b/fs/nfsd/nfsxdr.c
index 8a288c8fcd57c..9e00a902113e3 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;
}
diff --git a/net/sunrpc/xprtrdma/svc_rdma_sendto.c b/net/sunrpc/xprtrdma/svc_rdma_sendto.c
index c8411b4f3492a..d6436c13d5c47 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_sendto.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_sendto.c
@@ -448,7 +448,6 @@ static ssize_t svc_rdma_encode_write_chunk(__be32 *src,
* svc_rdma_encode_write_list - Encode RPC Reply's Write chunk list
* @rctxt: Reply context with information about the RPC Call
* @sctxt: Send context for the RPC Reply
- * @length: size in bytes of the payload in the first Write chunk
*
* The client provides a Write chunk list in the Call message. Fill
* in the segments in the first Write chunk in the Reply's transport
@@ -465,12 +464,12 @@ static ssize_t svc_rdma_encode_write_chunk(__be32 *src,
*/
static ssize_t
svc_rdma_encode_write_list(const struct svc_rdma_recv_ctxt *rctxt,
- struct svc_rdma_send_ctxt *sctxt,
- unsigned int length)
+ struct svc_rdma_send_ctxt *sctxt)
{
ssize_t len, ret;
- ret = svc_rdma_encode_write_chunk(rctxt->rc_write_list, sctxt, length);
+ ret = svc_rdma_encode_write_chunk(rctxt->rc_write_list, sctxt,
+ rctxt->rc_read_payload_length);
if (ret < 0)
return ret;
len = ret;
@@ -923,21 +922,12 @@ int svc_rdma_sendto(struct svc_rqst *rqstp)
goto err0;
if (wr_lst) {
/* XXX: Presume the client sent only one Write chunk */
- unsigned long offset;
- unsigned int length;
-
- if (rctxt->rc_read_payload_length) {
- offset = rctxt->rc_read_payload_offset;
- length = rctxt->rc_read_payload_length;
- } else {
- offset = xdr->head[0].iov_len;
- length = xdr->page_len;
- }
- ret = svc_rdma_send_write_chunk(rdma, wr_lst, xdr, offset,
- length);
+ ret = svc_rdma_send_write_chunk(rdma, wr_lst, xdr,
+ rctxt->rc_read_payload_offset,
+ rctxt->rc_read_payload_length);
if (ret < 0)
goto err2;
- if (svc_rdma_encode_write_list(rctxt, sctxt, length) < 0)
+ if (svc_rdma_encode_write_list(rctxt, sctxt) < 0)
goto err0;
} else {
if (xdr_stream_encode_item_absent(&sctxt->sc_stream) < 0)
