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Date: Tue, 9 Dec 2014 22:50:37 +0000
From: Al Viro <viro@...IV.linux.org.uk>
To: David Miller <davem@...emloft.net>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 24/25] skb_copy_datagram_iovec() can die
From: Al Viro <viro@...iv.linux.org.uk>
no callers other than itself.
Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
include/linux/skbuff.h | 2 --
net/core/datagram.c | 84 --------------------------------------------------
2 files changed, 86 deletions(-)
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 4902f2d..ab0bc43 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -2644,8 +2644,6 @@ struct sk_buff *skb_recv_datagram(struct sock *sk, unsigned flags, int noblock,
int *err);
unsigned int datagram_poll(struct file *file, struct socket *sock,
struct poll_table_struct *wait);
-int skb_copy_datagram_iovec(const struct sk_buff *from, int offset,
- struct iovec *to, int size);
int skb_copy_datagram_iter(const struct sk_buff *from, int offset,
struct iov_iter *to, int size);
static inline int skb_copy_datagram_msg(const struct sk_buff *from, int offset,
diff --git a/net/core/datagram.c b/net/core/datagram.c
index 41075ed..df493d6 100644
--- a/net/core/datagram.c
+++ b/net/core/datagram.c
@@ -310,90 +310,6 @@ int skb_kill_datagram(struct sock *sk, struct sk_buff *skb, unsigned int flags)
EXPORT_SYMBOL(skb_kill_datagram);
/**
- * skb_copy_datagram_iovec - Copy a datagram to an iovec.
- * @skb: buffer to copy
- * @offset: offset in the buffer to start copying from
- * @to: io vector to copy to
- * @len: amount of data to copy from buffer to iovec
- *
- * Note: the iovec is modified during the copy.
- */
-int skb_copy_datagram_iovec(const struct sk_buff *skb, int offset,
- struct iovec *to, int len)
-{
- int start = skb_headlen(skb);
- int i, copy = start - offset;
- struct sk_buff *frag_iter;
-
- trace_skb_copy_datagram_iovec(skb, len);
-
- /* Copy header. */
- if (copy > 0) {
- if (copy > len)
- copy = len;
- if (memcpy_toiovec(to, skb->data + offset, copy))
- goto fault;
- if ((len -= copy) == 0)
- return 0;
- offset += copy;
- }
-
- /* Copy paged appendix. Hmm... why does this look so complicated? */
- for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
- int end;
- const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
-
- WARN_ON(start > offset + len);
-
- end = start + skb_frag_size(frag);
- if ((copy = end - offset) > 0) {
- int err;
- u8 *vaddr;
- struct page *page = skb_frag_page(frag);
-
- if (copy > len)
- copy = len;
- vaddr = kmap(page);
- err = memcpy_toiovec(to, vaddr + frag->page_offset +
- offset - start, copy);
- kunmap(page);
- if (err)
- goto fault;
- if (!(len -= copy))
- return 0;
- offset += copy;
- }
- start = end;
- }
-
- skb_walk_frags(skb, frag_iter) {
- int end;
-
- WARN_ON(start > offset + len);
-
- end = start + frag_iter->len;
- if ((copy = end - offset) > 0) {
- if (copy > len)
- copy = len;
- if (skb_copy_datagram_iovec(frag_iter,
- offset - start,
- to, copy))
- goto fault;
- if ((len -= copy) == 0)
- return 0;
- offset += copy;
- }
- start = end;
- }
- if (!len)
- return 0;
-
-fault:
- return -EFAULT;
-}
-EXPORT_SYMBOL(skb_copy_datagram_iovec);
-
-/**
* skb_copy_datagram_iter - Copy a datagram to an iovec iterator.
* @skb: buffer to copy
* @offset: offset in the buffer to start copying from
--
2.1.3
--
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