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Subject[PATCH v2 09/17] kill zerocopy_sg_from_iovec()
Date
From: Al Viro <viro@zeniv.linux.org.uk>

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
include/linux/skbuff.h | 2 --
net/core/datagram.c | 65 ++----------------------------------------------
2 files changed, 2 insertions(+), 65 deletions(-)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index a01cd9a..178cdbd 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -2661,8 +2661,6 @@ int skb_copy_datagram_from_iovec(struct sk_buff *skb, int offset,
int len);
int skb_copy_datagram_from_iter(struct sk_buff *skb, int offset,
struct iov_iter *from, int len);
-int zerocopy_sg_from_iovec(struct sk_buff *skb, const struct iovec *frm,
- int offset, size_t count);
int skb_copy_datagram_iter(const struct sk_buff *from, int offset,
struct iov_iter *to, int size);
int zerocopy_sg_from_iter(struct sk_buff *skb, struct iov_iter *frm);
diff --git a/net/core/datagram.c b/net/core/datagram.c
index 3ea0384..c4d832e 100644
--- a/net/core/datagram.c
+++ b/net/core/datagram.c
@@ -645,76 +645,15 @@ fault:
EXPORT_SYMBOL(skb_copy_datagram_from_iter);

/**
- * zerocopy_sg_from_iovec - Build a zerocopy datagram from an iovec
+ * zerocopy_sg_from_iter - Build a zerocopy datagram from an iov_iter
* @skb: buffer to copy
- * @from: io vector to copy from
- * @offset: offset in the io vector to start copying from
- * @count: amount of vectors to copy to buffer from
+ * @from: the source to copy from
*
* The function will first copy up to headlen, and then pin the userspace
* pages and build frags through them.
*
* Returns 0, -EFAULT or -EMSGSIZE.
- * Note: the iovec is not modified during the copy
*/
-int zerocopy_sg_from_iovec(struct sk_buff *skb, const struct iovec *from,
- int offset, size_t count)
-{
- int len = iov_length(from, count) - offset;
- int copy = min_t(int, skb_headlen(skb), len);
- int size;
- int i = 0;
-
- /* copy up to skb headlen */
- if (skb_copy_datagram_from_iovec(skb, 0, from, offset, copy))
- return -EFAULT;
-
- if (len == copy)
- return 0;
-
- offset += copy;
- while (count--) {
- struct page *page[MAX_SKB_FRAGS];
- int num_pages;
- unsigned long base;
- unsigned long truesize;
-
- /* Skip over from offset and copied */
- if (offset >= from->iov_len) {
- offset -= from->iov_len;
- ++from;
- continue;
- }
- len = from->iov_len - offset;
- base = (unsigned long)from->iov_base + offset;
- size = ((base & ~PAGE_MASK) + len + ~PAGE_MASK) >> PAGE_SHIFT;
- if (i + size > MAX_SKB_FRAGS)
- return -EMSGSIZE;
- num_pages = get_user_pages_fast(base, size, 0, &page[i]);
- if (num_pages != size) {
- release_pages(&page[i], num_pages, 0);
- return -EFAULT;
- }
- truesize = size * PAGE_SIZE;
- skb->data_len += len;
- skb->len += len;
- skb->truesize += truesize;
- atomic_add(truesize, &skb->sk->sk_wmem_alloc);
- while (len) {
- int off = base & ~PAGE_MASK;
- int size = min_t(int, len, PAGE_SIZE - off);
- skb_fill_page_desc(skb, i, page[i], off, size);
- base += size;
- len -= size;
- i++;
- }
- offset = 0;
- ++from;
- }
- return 0;
-}
-EXPORT_SYMBOL(zerocopy_sg_from_iovec);
-
int zerocopy_sg_from_iter(struct sk_buff *skb, struct iov_iter *from)
{
int len = iov_iter_count(from);
--
1.7.10.4


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