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datagram: open-code copy_page_to_iter 

This will be useful to consolidate skb_copy_and_hash_datagram_iter and
skb_copy_and_csum_datagram to a single code path.

Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sagi Grimberg <sagi@lightbitslabs.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Sagi Grimberg 2018-12-03 17:52:06 -08:00 committed by Christoph Hellwig
parent 3152a97467
commit 0fc07791bc
1 changed files with 6 additions and 3 deletions
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9
net/core/datagram.c
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@ -445,11 +445,14 @@ int skb_copy_datagram_iter(const struct sk_buff *skb, int offset,
end = start + skb_frag_size(frag);
if ((copy = end - offset) > 0) {
struct page *page = skb_frag_page(frag);
u8 *vaddr = kmap(page);
if (copy > len)
copy = len;
n = copy_page_to_iter(skb_frag_page(frag),
frag->page_offset + offset -
start, copy, to);
n = copy_to_iter(vaddr + frag->page_offset +
offset - start, copy, to);
kunmap(page);
offset += n;
if (n != copy)
goto short_copy;