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svcrdma: fix bounce buffers for unaligned offsets and multiple pages 

[ Upstream commit c327a310ec ]

This was discovered using O_DIRECT at the client side, with small
unaligned file offsets or IOs that span multiple file pages.

Fixes: e248aa7be8 ("svcrdma: Remove max_sge check at connect time")
Signed-off-by: Dan Aloni <dan@kernelim.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
5.4-rM2-2.2.x-imx-squashed
Dan Aloni 2020-10-02 22:33:43 +03:00 committed by Greg Kroah-Hartman
parent 120222811b
commit 9c27185e12
1 changed files with 2 additions and 1 deletions
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3
net/sunrpc/xprtrdma/svc_rdma_sendto.c
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@ -609,10 +609,11 @@ static int svc_rdma_pull_up_reply_msg(struct svcxprt_rdma *rdma,
while (remaining) {
len = min_t(u32, PAGE_SIZE - pageoff, remaining);
memcpy(dst, page_address(*ppages), len);
memcpy(dst, page_address(*ppages) + pageoff, len);
remaining -= len;
dst += len;
pageoff = 0;
ppages++;
}
}