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SUNRPC: Simplify the end-of-buffer calculation in xdr_read_pages 

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2012-06-26 13:50:43 -04:00
parent b760b3131d
commit bd00f84bc5
1 changed files with 7 additions and 8 deletions
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15
net/sunrpc/xdr.c
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@ -762,11 +762,10 @@ unsigned int xdr_read_pages(struct xdr_stream *xdr, unsigned int len)
{
struct xdr_buf *buf = xdr->buf;
struct kvec *iov;
ssize_t shift;
unsigned int nwords = XDR_QUADLEN(len);
unsigned int cur = xdr_stream_pos(xdr);
unsigned int end;
int padding;
unsigned int padding;
if (xdr->nwords == 0)
return 0;
@ -782,15 +781,15 @@ unsigned int xdr_read_pages(struct xdr_stream *xdr, unsigned int len)
/* Truncate page data and move it into the tail */
if (buf->page_len > len)
xdr_shrink_pagelen(buf, buf->page_len - len);
xdr->nwords = XDR_QUADLEN(buf->len - cur);
padding = (nwords << 2) - len;
xdr->iov = iov = buf->tail;
/* Compute remaining message length. */
end = iov->iov_len;
shift = buf->buflen - buf->len;
if (end > shift + padding)
end -= shift;
else
end = padding;
end = ((xdr->nwords - nwords) << 2) + padding;
if (end > iov->iov_len)
end = iov->iov_len;
/*
* Position current pointer at beginning of tail, and
* set remaining message length.