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SUNRPC: Refactor rpc_xdr_buf_init() 

Clean up: there is some XDR initialization logic that is common
to the forward channel and backchannel. Move it to an XDR header
so it can be shared.

rpc_rqst::rq_buffer points to a buffer containing big-endian data.
Update its annotation as part of the clean up.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Chuck Lever 2016-09-15 10:55:12 -04:00 committed by Anna Schumaker
parent eb342e9a38
commit b9c5bc03be
5 changed files with 21 additions and 37 deletions
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12
include/linux/sunrpc/xdr.h
View File

@ -67,6 +67,18 @@ struct xdr_buf {
len; /* Length of XDR encoded message */
};
static inline void
xdr_buf_init(struct xdr_buf *buf, void *start, size_t len)
{
buf->head[0].iov_base = start;
buf->head[0].iov_len = len;
buf->tail[0].iov_len = 0;
buf->page_len = 0;
buf->flags = 0;
buf->len = 0;
buf->buflen = len;
}
/*
* pre-xdr'ed macros.
*/

2
include/linux/sunrpc/xprt.h
View File

@ -83,7 +83,7 @@ struct rpc_rqst {
void (*rq_release_snd_buf)(struct rpc_rqst *); /* release rq_enc_pages */
struct list_head rq_list;
__u32 * rq_buffer; /* XDR encode buffer */
void *rq_buffer; /* Call XDR encode buffer */
size_t rq_callsize,
rq_rcvsize;
size_t rq_xmit_bytes_sent; /* total bytes sent */

8
net/sunrpc/backchannel_rqst.c
View File

@ -76,13 +76,7 @@ static int xprt_alloc_xdr_buf(struct xdr_buf *buf, gfp_t gfp_flags)
page = alloc_page(gfp_flags);
if (page == NULL)
return -ENOMEM;
buf->head[0].iov_base = page_address(page);
buf->head[0].iov_len = PAGE_SIZE;
buf->tail[0].iov_base = NULL;
buf->tail[0].iov_len = 0;
buf->page_len = 0;
buf->len = 0;
buf->buflen = PAGE_SIZE;
xdr_buf_init(buf, page_address(page), PAGE_SIZE);
return 0;
}

24
net/sunrpc/clnt.c
View File

@ -1746,18 +1746,6 @@ rpc_task_force_reencode(struct rpc_task *task)
task->tk_rqstp->rq_bytes_sent = 0;
}
static inline void
rpc_xdr_buf_init(struct xdr_buf *buf, void *start, size_t len)
{
buf->head[0].iov_base = start;
buf->head[0].iov_len = len;
buf->tail[0].iov_len = 0;
buf->page_len = 0;
buf->flags = 0;
buf->len = 0;
buf->buflen = len;
}
/*
* 3. Encode arguments of an RPC call
*/
@ -1770,12 +1758,12 @@ rpc_xdr_encode(struct rpc_task *task)
dprint_status(task);
rpc_xdr_buf_init(&req->rq_snd_buf,
req->rq_buffer,
req->rq_callsize);
rpc_xdr_buf_init(&req->rq_rcv_buf,
(char *)req->rq_buffer + req->rq_callsize,
req->rq_rcvsize);
xdr_buf_init(&req->rq_snd_buf,
req->rq_buffer,
req->rq_callsize);
xdr_buf_init(&req->rq_rcv_buf,
(char *)req->rq_buffer + req->rq_callsize,
req->rq_rcvsize);
p = rpc_encode_header(task);
if (p == NULL) {

12
net/sunrpc/xprtrdma/backchannel.c
View File

@ -38,7 +38,6 @@ static int rpcrdma_bc_setup_rqst(struct rpcrdma_xprt *r_xprt,
struct rpcrdma_ia *ia = &r_xprt->rx_ia;
struct rpcrdma_regbuf *rb;
struct rpcrdma_req *req;
struct xdr_buf *buf;
size_t size;
req = rpcrdma_create_req(r_xprt);
@ -60,16 +59,7 @@ static int rpcrdma_bc_setup_rqst(struct rpcrdma_xprt *r_xprt,
req->rl_sendbuf = rb;
/* so that rpcr_to_rdmar works when receiving a request */
rqst->rq_buffer = (void *)req->rl_sendbuf->rg_base;
buf = &rqst->rq_snd_buf;
buf->head[0].iov_base = rqst->rq_buffer;
buf->head[0].iov_len = 0;
buf->tail[0].iov_base = NULL;
buf->tail[0].iov_len = 0;
buf->page_len = 0;
buf->len = 0;
buf->buflen = size;
xdr_buf_init(&rqst->rq_snd_buf, rqst->rq_buffer, size);
return 0;
out_fail: