From 58d331312bf78a10740fc3c6c370c98e8c53fa6b Mon Sep 17 00:00:00 2001 From: Christian Schoenebeck Date: Fri, 15 Jul 2022 23:32:30 +0200 Subject: 9p: add P9_ERRMAX for 9p2000 and 9p2000.u Add P9_ERRMAX macro to 9P protocol header which reflects the maximum error string length of Rerror replies for 9p2000 and 9p2000.u protocol versions. Unfortunately a maximum error string length is not defined by the 9p2000 spec, picking 128 as value for now, as this seems to be a common max. size for POSIX error strings in practice. 9p2000.L protocol version uses Rlerror replies instead which does not contain an error string. Link: https://lkml.kernel.org/r/3f23191d21032e7c14852b1e1a4ae26417a36739.1657920926.git.linux_oss@crudebyte.com Signed-off-by: Christian Schoenebeck Signed-off-by: Dominique Martinet --- include/net/9p/9p.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'include/net/9p') diff --git a/include/net/9p/9p.h b/include/net/9p/9p.h index 24a509f559ee..13abe013af21 100644 --- a/include/net/9p/9p.h +++ b/include/net/9p/9p.h @@ -331,6 +331,9 @@ enum p9_qid_t { /* size of header for zero copy read/write */ #define P9_ZC_HDR_SZ 4096 +/* maximum length of an error string */ +#define P9_ERRMAX 128 + /** * struct p9_qid - file system entity information * @type: 8-bit type &p9_qid_t -- cgit v1.2.3