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SUNRPC: Optimise away unnecessary data moves in xdr_align_pages

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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>
This commit is contained in:
Trond Myklebust 2012-08-02 13:21:43 -04:00
parent 13fe4ba1b6
commit a11a2bf4de
1 changed files with 13 additions and 10 deletions
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23
net/sunrpc/xdr.c
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@ -730,21 +730,24 @@ static unsigned int xdr_align_pages(struct xdr_stream *xdr, unsigned int len)
if (xdr->nwords == 0)
return 0;
/* Realign pages to current pointer position */
iov = buf->head;
if (iov->iov_len > cur) {
xdr_shrink_bufhead(buf, iov->iov_len - cur);
xdr->nwords = XDR_QUADLEN(buf->len - cur);
}
if (nwords > xdr->nwords) {
nwords = xdr->nwords;
len = nwords << 2;
}
/* Realign pages to current pointer position */
iov = buf->head;
if (iov->iov_len > cur)
xdr_shrink_bufhead(buf, iov->iov_len - cur);
/* Truncate page data and move it into the tail */
if (buf->page_len > len)
xdr_shrink_pagelen(buf, buf->page_len - len);
else
if (buf->page_len <= len)
len = buf->page_len;
xdr->nwords = XDR_QUADLEN(buf->len - cur);
else if (nwords < xdr->nwords) {
/* Truncate page data and move it into the tail */
xdr_shrink_pagelen(buf, buf->page_len - len);
xdr->nwords = XDR_QUADLEN(buf->len - cur);
}
return len;
}