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SUNRPC: Implement a xdr_page_pos() function 

I'll need this for READ_PLUS to help figure out the offset where page
data is stored at, but it might also be useful for other things.

Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Anna Schumaker 2020-04-17 11:00:24 -04:00
parent f7d61ee414
commit cf1f08cac3
2 changed files with 14 additions and 0 deletions
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1
include/linux/sunrpc/xdr.h
View File

@ -240,6 +240,7 @@ extern int xdr_restrict_buflen(struct xdr_stream *xdr, int newbuflen);
extern void xdr_write_pages(struct xdr_stream *xdr, struct page **pages,
unsigned int base, unsigned int len);
extern unsigned int xdr_stream_pos(const struct xdr_stream *xdr);
extern unsigned int xdr_page_pos(const struct xdr_stream *xdr);
extern void xdr_init_decode(struct xdr_stream *xdr, struct xdr_buf *buf,
__be32 *p, struct rpc_rqst *rqst);
extern void xdr_init_decode_pages(struct xdr_stream *xdr, struct xdr_buf *buf,

13
net/sunrpc/xdr.c
View File

@ -505,6 +505,19 @@ unsigned int xdr_stream_pos(const struct xdr_stream *xdr)
}
EXPORT_SYMBOL_GPL(xdr_stream_pos);
/**
* xdr_page_pos - Return the current offset from the start of the xdr pages
* @xdr: pointer to struct xdr_stream
*/
unsigned int xdr_page_pos(const struct xdr_stream *xdr)
{
unsigned int pos = xdr_stream_pos(xdr);
WARN_ON(pos < xdr->buf->head[0].iov_len);
return pos - xdr->buf->head[0].iov_len;
}
EXPORT_SYMBOL_GPL(xdr_page_pos);
/**
* xdr_init_encode - Initialize a struct xdr_stream for sending data.
* @xdr: pointer to xdr_stream struct