SUNRPC: Optimise away unnecessary data moves in xdr_align_pages
We only have to call xdr_shrink_pagelen() if the remaining RPC message does not fit in the page buffer length that we supplied to xdr_align_pages(). Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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@ -730,21 +730,24 @@ static unsigned int xdr_align_pages(struct xdr_stream *xdr, unsigned int len)
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if (xdr->nwords == 0)
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return 0;
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/* Realign pages to current pointer position */
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iov = buf->head;
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if (iov->iov_len > cur) {
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xdr_shrink_bufhead(buf, iov->iov_len - cur);
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xdr->nwords = XDR_QUADLEN(buf->len - cur);
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}
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if (nwords > xdr->nwords) {
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nwords = xdr->nwords;
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len = nwords << 2;
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}
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/* Realign pages to current pointer position */
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iov = buf->head;
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if (iov->iov_len > cur)
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xdr_shrink_bufhead(buf, iov->iov_len - cur);
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/* Truncate page data and move it into the tail */
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if (buf->page_len > len)
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xdr_shrink_pagelen(buf, buf->page_len - len);
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else
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if (buf->page_len <= len)
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len = buf->page_len;
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xdr->nwords = XDR_QUADLEN(buf->len - cur);
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else if (nwords < xdr->nwords) {
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/* Truncate page data and move it into the tail */
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xdr_shrink_pagelen(buf, buf->page_len - len);
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xdr->nwords = XDR_QUADLEN(buf->len - cur);
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}
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return len;
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}
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