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9p: add P9_ERRMAX for 9p2000 and 9p2000.u

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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 <linux_oss@crudebyte.com>
Signed-off-by: Dominique Martinet <asmadeus@codewreck.org>
This commit is contained in:
Christian Schoenebeck 2022-07-15 23:32:30 +02:00 committed by Dominique Martinet
parent e7c6219778
commit 58d331312b
1 changed files with 3 additions and 0 deletions
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3
include/net/9p/9p.h
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@ -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