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Fix kernel handling of a NFSERR_MINORVERSMISMATCH NFSv4 server reply.

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When an NFSv4 server replies NFSERR_MINORVERSMISMATCH, it does not generate
a status result for the first operation in the compound. Without this
patch, this will result in a bogus EBADXDR error return.
Returning EBADXDR is relatively harmless, but a correct reply of
NFSERR_MINORVERSMISMATCH is needed by the pNFS client to select the correct
minor version to use for a File Layout DS now that there can be NFSv4.2
DS servers.

mount_nfs.c still needs to be fixed for this, although how the mount fails
is only useful to help sysadmins isolate why a mount fails.

Found during testing of the NFSv4.2 client and server.

MFC after:	2 weeks
This commit is contained in:
Rick Macklem 2019-12-08 00:06:00 +00:00
parent c0829bb1d6
commit 8e1906f700
1 changed files with 2 additions and 1 deletions
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3
sys/fs/nfs/nfs_commonkrpc.c
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@ -918,7 +918,8 @@ tryagain:
* Get rid of the tag, return count and SEQUENCE result for
* NFSv4.
*/
if ((nd->nd_flag & ND_NFSV4) != 0) {
if ((nd->nd_flag & ND_NFSV4) != 0 && nd->nd_repstat !=
NFSERR_MINORVERMISMATCH) {
NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
i = fxdr_unsigned(int, *tl);
error = nfsm_advance(nd, NFSM_RNDUP(i), -1);