From: Anna Schumaker <Anna.Schumaker@xxxxxxxxxx>
This will be used during READ_PLUS decoding for handling HOLE segments.
Signed-off-by: Anna Schumaker <Anna.Schumaker@xxxxxxxxxx>
---
include/linux/sunrpc/xdr.h | 2 ++
net/sunrpc/xdr.c | 23 +++++++++++++++++++++++
2 files changed, 25 insertions(+)
diff --git a/include/linux/sunrpc/xdr.h b/include/linux/sunrpc/xdr.h
index 607340fa1fd4..d632fd170bf6 100644
--- a/include/linux/sunrpc/xdr.h
+++ b/include/linux/sunrpc/xdr.h
@@ -269,6 +269,8 @@ extern bool xdr_stream_subsegment(struct xdr_stream *xdr, struct xdr_buf *subbuf
unsigned int len);
extern unsigned int xdr_stream_move_segment(struct xdr_stream *xdr, unsigned int offset,
unsigned int target, unsigned int length);
+extern unsigned int xdr_stream_zero(struct xdr_stream *xdr, unsigned int offset,
+ unsigned int length);
/**
* xdr_set_scratch_buffer - Attach a scratch buffer for decoding data.
diff --git a/net/sunrpc/xdr.c b/net/sunrpc/xdr.c
index ff36a20aab89..7c7c4d360950 100644
--- a/net/sunrpc/xdr.c
+++ b/net/sunrpc/xdr.c
@@ -1795,6 +1795,29 @@ void xdr_buf_trim_head(struct xdr_buf *buf, unsigned int len)
}
EXPORT_SYMBOL_GPL(xdr_buf_trim_head);
+/**
+ * xdr_stream_zero - zero out a portion of an xdr_stream
+ * @xdr: an xdr_stream to zero out
+ * @offset: the starting point in the stream
+ * @length: the number of bytes to zero
+ */
+unsigned int xdr_stream_zero(struct xdr_stream *xdr, unsigned int offset,
+ unsigned int length)
+{
+ struct xdr_buf buf;
+
+ if (xdr_buf_subsegment(xdr->buf, &buf, offset, length) < 0)
+ return 0;
+ if (buf.head[0].iov_len)
+ xdr_buf_iov_zero(buf.head, 0, buf.head[0].iov_len);
+ if (buf.page_len > 0)
+ xdr_buf_pages_zero(&buf, 0, buf.page_len);
+ if (buf.tail[0].iov_len)
+ xdr_buf_iov_zero(buf.tail, 0, buf.tail[0].iov_len);
+ return length;
+}
+EXPORT_SYMBOL_GPL(xdr_stream_zero);
+
/**
* xdr_buf_trim - lop at most "len" bytes off the end of "buf"
* @buf: buf to be trimmed
--
2.36.1
