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SUNRPC: Clean up xdr_read_pages

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Move the page alignment code into a separate helper.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2012-06-26 12:34:05 -04:00
parent bd00f84bc5
commit 3994ee6fbf
1 changed files with 26 additions and 14 deletions
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40
net/sunrpc/xdr.c
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@ -747,25 +747,12 @@ __be32 * xdr_inline_decode(struct xdr_stream *xdr, size_t nbytes)
}
EXPORT_SYMBOL_GPL(xdr_inline_decode);
/**
* xdr_read_pages - Ensure page-based XDR data to decode is aligned at current pointer position
* @xdr: pointer to xdr_stream struct
* @len: number of bytes of page data
*
* Moves data beyond the current pointer position from the XDR head[] buffer
* into the page list. Any data that lies beyond current position + "len"
* bytes is moved into the XDR tail[].
*
* Returns the number of XDR encoded bytes now contained in the pages
*/
unsigned int xdr_read_pages(struct xdr_stream *xdr, unsigned int len)
static unsigned int xdr_align_pages(struct xdr_stream *xdr, unsigned int len)
{
struct xdr_buf *buf = xdr->buf;
struct kvec *iov;
unsigned int nwords = XDR_QUADLEN(len);
unsigned int cur = xdr_stream_pos(xdr);
unsigned int end;
unsigned int padding;
if (xdr->nwords == 0)
return 0;
@ -782,7 +769,32 @@ unsigned int xdr_read_pages(struct xdr_stream *xdr, unsigned int len)
if (buf->page_len > len)
xdr_shrink_pagelen(buf, buf->page_len - len);
xdr->nwords = XDR_QUADLEN(buf->len - cur);
return len;
}
/**
* xdr_read_pages - Ensure page-based XDR data to decode is aligned at current pointer position
* @xdr: pointer to xdr_stream struct
* @len: number of bytes of page data
*
* Moves data beyond the current pointer position from the XDR head[] buffer
* into the page list. Any data that lies beyond current position + "len"
* bytes is moved into the XDR tail[].
*
* Returns the number of XDR encoded bytes now contained in the pages
*/
unsigned int xdr_read_pages(struct xdr_stream *xdr, unsigned int len)
{
struct xdr_buf *buf = xdr->buf;
struct kvec *iov;
unsigned int nwords;
unsigned int end;
unsigned int padding;
len = xdr_align_pages(xdr, len);
if (len == 0)
return 0;
nwords = XDR_QUADLEN(len);
padding = (nwords << 2) - len;
xdr->iov = iov = buf->tail;
/* Compute remaining message length. */