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net: move iov_pages() to net/core/iovec.c

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To let it be reused and reduce code duplication.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jason Wang
2013-08-06 17:45:03 +08:00
committed by David S. Miller
parent 6261d983f2
commit b4bf07771f
4 changed files with 26 additions and 46 deletions
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23
drivers/net/macvtap.c
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@@ -698,29 +698,6 @@ static int macvtap_skb_to_vnet_hdr(const struct sk_buff *skb,
return 0;
}
static unsigned long iov_pages(const struct iovec *iv, int offset,
unsigned long nr_segs)
{
unsigned long seg, base;
int pages = 0, len, size;
while (nr_segs && (offset >= iv->iov_len)) {
offset -= iv->iov_len;
++iv;
--nr_segs;
}
for (seg = 0; seg < nr_segs; seg++) {
base = (unsigned long)iv[seg].iov_base + offset;
len = iv[seg].iov_len - offset;
size = ((base & ~PAGE_MASK) + len + ~PAGE_MASK) >> PAGE_SHIFT;
pages += size;
offset = 0;
}
return pages;
}
/* Get packet from user space buffer */
static ssize_t macvtap_get_user(struct macvtap_queue *q, struct msghdr *m,
const struct iovec *iv, unsigned long total_len,