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nfsd: Map -ESTALE from case probe to NFS3ERR_STALE

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The PATHCONF switch in nfsd3_proc_pathconf() recognizes -EOPNOTSUPP
(filesystem does not expose case state) and maps -EACCES / -EPERM to
nfserr_stale, but lets every other errno fall through to
nfserr_serverfault. -ESTALE escapes the same way even though RFC 1813
lists NFS3ERR_STALE as a permitted PATHCONF status, so a probe of an
NFS-backed re-export whose parent dentry has been invalidated returns
SERVERFAULT and tells the client the server is broken when the handle
itself simply went stale.

Add an explicit -ESTALE arm that maps to nfserr_stale.

Fixes: a8de9c3b40e4 ("nfsd: Report export case-folding via NFSv3 PATHCONF")
Reported-by: sashiko-bot <sashiko-bot@kernel.org>
Closes: https://sashiko.dev/#/patchset/20260507-case-sensitivity-v14-0-e62cc8200435@oracle.com?part=13
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Link: https://patch.msgid.link/20260515153515.362266-7-cel@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Chuck Lever
2026-05-15 11:35:14 -04:00
committed by Christian Brauner
parent 3aa75b92e8
commit fbaee2a5c4
1 changed files with 3 additions and 0 deletions
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3
fs/nfsd/nfs3proc.c
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@@ -745,6 +745,9 @@ nfsd3_proc_pathconf(struct svc_rqst *rqstp)
*/
resp->status = nfserr_stale;
break;
case -ESTALE:
resp->status = nfserr_stale;
break;
default:
resp->status = nfserr_serverfault;
break;