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svcrdma: Add helper to save pages under I/O 

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@oracle.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Chuck Lever 2017-04-09 13:06:00 -04:00 committed by J. Bruce Fields
parent b623589dba
commit c55ab0707b
1 changed files with 18 additions and 13 deletions
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31
net/sunrpc/xprtrdma/svc_rdma_sendto.c
View File

@ -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_post_send_wr - Set up and post one Send Work Request
* @rdma: controlling transport
@ -543,8 +560,6 @@ 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 */
@ -587,17 +602,7 @@ 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);