[PATCH 5.10 509/770] NFSD: Clean up nfsd_splice_actor()

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5.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Chuck Lever <chuck.lever@xxxxxxxxxx>

[ Upstream commit 91e23b1c39820bfed642119ff6b6ef9f43cf09ce ]

nfsd_splice_actor() checks that the page being spliced does not
match the previous element in the svc_rqst::rq_pages array. We
believe this is to prevent a double put_page() in cases where the
READ payload is partially contained in the xdr_buf's head buffer.

However, the NFSD READ proc functions no longer place any part of
the READ payload in the head buffer, in order to properly support
NFS/RDMA READ with Write chunks. Therefore, simplify the logic in
nfsd_splice_actor() to remove this unnecessary check.

Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 fs/nfsd/vfs.c | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 86584e727ce09..0968eaf735c85 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -874,17 +874,11 @@ nfsd_splice_actor(struct pipe_inode_info *pipe, struct pipe_buffer *buf,
 		  struct splice_desc *sd)
 {
 	struct svc_rqst *rqstp = sd->u.data;
-	struct page **pp = rqstp->rq_next_page;
-	struct page *page = buf->page;
 
-	if (rqstp->rq_res.page_len == 0) {
-		svc_rqst_replace_page(rqstp, page);
+	svc_rqst_replace_page(rqstp, buf->page);
+	if (rqstp->rq_res.page_len == 0)
 		rqstp->rq_res.page_base = buf->offset;
-	} else if (page != pp[-1]) {
-		svc_rqst_replace_page(rqstp, page);
-	}
 	rqstp->rq_res.page_len += sd->len;
-
 	return sd->len;
 }
 
-- 
2.43.0







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