Clean up: extract the logic to save pages under I/O into a helper to
add a big documenting comment without adding clutter in the send
path.
This is a refactoring change only.
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
Reviewed-by: Sagi Grimberg <sagi@xxxxxxxxxxx>
---
net/sunrpc/xprtrdma/svc_rdma_sendto.c | 31 ++++++++++++++++++-------------
1 file changed, 18 insertions(+), 13 deletions(-)
diff --git a/net/sunrpc/xprtrdma/svc_rdma_sendto.c b/net/sunrpc/xprtrdma/svc_rdma_sendto.c
index 0e55b34..b4028bc3 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_sendto.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_sendto.c
@@ -478,6 +478,23 @@ static int send_reply_chunks(struct svcxprt_rdma *xprt,
return -EIO;
}
+/* The svc_rqst and all resources it owns are released as soon as
+ * svc_rdma_sendto returns. Transfer pages under I/O to the ctxt
+ * so they are released by the Send completion handler.
+ */
+static void svc_rdma_save_io_pages(struct svc_rqst *rqstp,
+ struct svc_rdma_op_ctxt *ctxt)
+{
+ int i, pages = rqstp->rq_next_page - rqstp->rq_respages;
+
+ ctxt->count += pages;
+ for (i = 0; i < pages; i++) {
+ ctxt->pages[i + 1] = rqstp->rq_respages[i];
+ rqstp->rq_respages[i] = NULL;
+ }
+ rqstp->rq_next_page = rqstp->rq_respages + 1;
+}
+
/**
* svc_rdma_build_send_wr - Set up a Send Work Request
* @ctxt: op_ctxt for transmitting the Send WR
@@ -529,8 +546,6 @@ static int send_reply(struct svcxprt_rdma *rdma,
u32 xdr_off;
int sge_no;
int sge_bytes;
- int page_no;
- int pages;
int ret = -EIO;
/* Prepare the context */
@@ -573,17 +588,7 @@ static int send_reply(struct svcxprt_rdma *rdma,
goto err;
}
- /* Save all respages in the ctxt and remove them from the
- * respages array. They are our pages until the I/O
- * completes.
- */
- pages = rqstp->rq_next_page - rqstp->rq_respages;
- for (page_no = 0; page_no < pages; page_no++) {
- ctxt->pages[page_no+1] = rqstp->rq_respages[page_no];
- ctxt->count++;
- rqstp->rq_respages[page_no] = NULL;
- }
- rqstp->rq_next_page = rqstp->rq_respages + 1;
+ svc_rdma_save_io_pages(rqstp, ctxt);
if (sge_no > rdma->sc_max_sge) {
pr_err("svcrdma: Too many sges (%d)\n", sge_no);
--
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