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RPC: Allow struc xdr_stream to read the page section of an xdr_buf 

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2006-06-09 09:34:21 -04:00
parent 51d8fa6a10
commit 8b23ea7bed
2 changed files with 27 additions and 2 deletions
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1
include/linux/sunrpc/xdr.h
View File

@ -194,6 +194,7 @@ extern void xdr_write_pages(struct xdr_stream *xdr, struct page **pages,
extern void xdr_init_decode(struct xdr_stream *xdr, struct xdr_buf *buf, uint32_t *p); extern void xdr_init_decode(struct xdr_stream *xdr, struct xdr_buf *buf, uint32_t *p);
extern uint32_t *xdr_inline_decode(struct xdr_stream *xdr, size_t nbytes); extern uint32_t *xdr_inline_decode(struct xdr_stream *xdr, size_t nbytes);
extern void xdr_read_pages(struct xdr_stream *xdr, unsigned int len); extern void xdr_read_pages(struct xdr_stream *xdr, unsigned int len);
extern void xdr_enter_page(struct xdr_stream *xdr, unsigned int len);
#endif /* __KERNEL__ */ #endif /* __KERNEL__ */

28
net/sunrpc/xdr.c
View File

@ -568,8 +568,7 @@ EXPORT_SYMBOL(xdr_inline_decode);
* *
* Moves data beyond the current pointer position from the XDR head[] buffer * Moves data beyond the current pointer position from the XDR head[] buffer
* into the page list. Any data that lies beyond current position + "len" * into the page list. Any data that lies beyond current position + "len"
* bytes is moved into the XDR tail[]. The current pointer is then * bytes is moved into the XDR tail[].
* repositioned at the beginning of the XDR tail.
*/ */
void xdr_read_pages(struct xdr_stream *xdr, unsigned int len) void xdr_read_pages(struct xdr_stream *xdr, unsigned int len)
{ {
@ -606,6 +605,31 @@ void xdr_read_pages(struct xdr_stream *xdr, unsigned int len)
} }
EXPORT_SYMBOL(xdr_read_pages); EXPORT_SYMBOL(xdr_read_pages);
/**
* xdr_enter_page - decode data from the XDR page
* @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[]. The current pointer is then
* repositioned at the beginning of the first XDR page.
*/
void xdr_enter_page(struct xdr_stream *xdr, unsigned int len)
{
char * kaddr = page_address(xdr->buf->pages[0]);
xdr_read_pages(xdr, len);
/*
* Position current pointer at beginning of tail, and
* set remaining message length.
*/
if (len > PAGE_CACHE_SIZE - xdr->buf->page_base)
len = PAGE_CACHE_SIZE - xdr->buf->page_base;
xdr->p = (uint32_t *)(kaddr + xdr->buf->page_base);
xdr->end = (uint32_t *)((char *)xdr->p + len);
}
EXPORT_SYMBOL(xdr_enter_page);
static struct kvec empty_iov = {.iov_base = NULL, .iov_len = 0}; static struct kvec empty_iov = {.iov_base = NULL, .iov_len = 0};
void void