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author | Al Viro <viro@zeniv.linux.org.uk> | 2014-11-06 00:56:48 -0500 |
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committer | Al Viro <viro@zeniv.linux.org.uk> | 2014-11-24 05:16:39 -0500 |
commit | 195e952d03a797aa953f62ffe24ec58693e17ed8 (patch) | |
tree | 1b87473ceeacc8588cc6f9b0b777681d4ceacbe0 /net/core/datagram.c | |
parent | f5ff53b4d97c62e63ee2868fd4b8d7896643ee03 (diff) | |
download | linux-stable-195e952d03a797aa953f62ffe24ec58693e17ed8.tar.gz linux-stable-195e952d03a797aa953f62ffe24ec58693e17ed8.tar.bz2 linux-stable-195e952d03a797aa953f62ffe24ec58693e17ed8.zip |
kill zerocopy_sg_from_iovec()
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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'net/core/datagram.c')
-rw-r--r-- | net/core/datagram.c | 65 |
1 files changed, 2 insertions, 63 deletions
diff --git a/net/core/datagram.c b/net/core/datagram.c index 3ea038431ceb..c4d832efebb8 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); |