@@ -242,6 +242,8 @@ 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(struct xdr_buf *buf, unsigned int offset, unsigned int len, int (*actor)(struct scatterlist *, void *), void *data);
+ssize_t xdr_stream_decode_string_dup(struct xdr_stream *xdr, char **str,
+ size_t maxlen, gfp_t gfp_flags);
/**
* xdr_align_size - Calculate padded size of an object
* @n: Size of an object being XDR encoded (in bytes)
@@ -1518,3 +1518,37 @@ xdr_process_buf(struct xdr_buf *buf, unsigned int offset, unsigned int len,
}
EXPORT_SYMBOL_GPL(xdr_process_buf);
+/**
+ * xdr_stream_decode_string_dup - Decode and duplicate variable length string
+ * @xdr: pointer to xdr_stream
+ * @str: location to store pointer to string
+ * @maxlen: maximum acceptable string length
+ * @gfp_flags: GFP mask to use
+ *
+ * Return values:
+ * On success, returns length of NUL-terminated string stored in *@ptr
+ * %-ENOBUFS on XDR buffer overflow
+ * %-ENOMEM on memory allocation failure
+ * %-E2BIG if the size of the string would exceed @maxlen
+ */
+ssize_t xdr_stream_decode_string_dup(struct xdr_stream *xdr, char **str,
+ size_t maxlen, gfp_t gfp_flags)
+{
+ void *p;
+ ssize_t ret;
+
+ ret = xdr_stream_decode_opaque_inline(xdr, &p, maxlen);
+ if (ret > 0) {
+ char *s = kmalloc(ret + 1, gfp_flags);
+ if (s != NULL) {
+ memcpy(s, p, ret);
+ s[ret] = '\0';
+ *str = s;
+ return strlen(s);
+ }
+ ret = -ENOMEM;
+ }
+ *str = NULL;
+ return ret;
+}
+EXPORT_SYMBOL_GPL(xdr_stream_decode_string_dup);
Create a helper function that decodes a xdr string object, allocates a memory buffer and then store it as a NUL terminated string. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com> --- include/linux/sunrpc/xdr.h | 2 ++ net/sunrpc/xdr.c | 34 ++++++++++++++++++++++++++++++++++ 2 files changed, 36 insertions(+)