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SUNRPC: Add a function for directly setting the xdr page len 

We need to do this step during READ_PLUS decoding so that we know pages
are the right length and any extra data has been preserved in the tail.

Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Anna Schumaker 2022-07-21 14:21:32 -04:00 committed by Trond Myklebust
parent 4f5f3b6028
commit 7c4cd5f4d2
2 changed files with 31 additions and 0 deletions
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1
include/linux/sunrpc/xdr.h
View File

@ -258,6 +258,7 @@ extern __be32 *xdr_inline_decode(struct xdr_stream *xdr, size_t nbytes);
extern unsigned int xdr_read_pages(struct xdr_stream *xdr, unsigned int len);
extern void xdr_enter_page(struct xdr_stream *xdr, unsigned int len);
extern int xdr_process_buf(const struct xdr_buf *buf, unsigned int offset, unsigned int len, int (*actor)(struct scatterlist *, void *), void *data);
extern void xdr_set_pagelen(struct xdr_stream *, unsigned int len);
extern unsigned int xdr_align_data(struct xdr_stream *, unsigned int offset, unsigned int length);
extern unsigned int xdr_expand_hole(struct xdr_stream *, unsigned int offset, unsigned int length);
extern bool xdr_stream_subsegment(struct xdr_stream *xdr, struct xdr_buf *subbuf,

30
net/sunrpc/xdr.c
View File

@ -1500,6 +1500,36 @@ unsigned int xdr_read_pages(struct xdr_stream *xdr, unsigned int len)
}
EXPORT_SYMBOL_GPL(xdr_read_pages);
/**
* xdr_set_pagelen - Sets the length of the XDR pages
* @xdr: pointer to xdr_stream struct
* @len: new length of the XDR page data
*
* Either grows or shrinks the length of the xdr pages by setting pagelen to
* @len bytes. When shrinking, any extra data is moved into buf->tail, whereas
* when growing any data beyond the current pointer is moved into the tail.
*
* Returns True if the operation was successful, and False otherwise.
*/
void xdr_set_pagelen(struct xdr_stream *xdr, unsigned int len)
{
struct xdr_buf *buf = xdr->buf;
size_t remaining = xdr_stream_remaining(xdr);
size_t base = 0;
if (len < buf->page_len) {
base = buf->page_len - len;
xdr_shrink_pagelen(buf, len);
} else {
xdr_buf_head_shift_right(buf, xdr_stream_pos(xdr),
buf->page_len, remaining);
if (len > buf->page_len)
xdr_buf_try_expand(buf, len - buf->page_len);
}
xdr_set_tail_base(xdr, base, remaining);
}
EXPORT_SYMBOL_GPL(xdr_set_pagelen);
unsigned int xdr_align_data(struct xdr_stream *xdr, unsigned int offset,
unsigned int length)
{