[PATCH v3 3/3] nfsd: back channel stuck in SEQ4_STATUS_CB_PATH_DOWN
From: Dai Ngo <dai.ngo@oracle.com>
Date: 2021-09-16 18:23:36
Also in:
linux-fsdevel
Subsystem:
filesystems (vfs and infrastructure), kernel nfsd, sunrpc, and lockd servers, the rest · Maintainers:
Alexander Viro, Christian Brauner, Chuck Lever, Jeff Layton, Linus Torvalds
When the back channel enters SEQ4_STATUS_CB_PATH_DOWN state, the client recovers by sending BIND_CONN_TO_SESSION but the server fails to recover the back channel and leaves it as NFSD4_CB_DOWN. Fix by enhancing nfsd4_bind_conn_to_session to probe the back channel by calling nfsd4_probe_callback. Signed-off-by: Dai Ngo <dai.ngo@oracle.com> --- fs/nfsd/nfs4state.c | 16 +++++++++++++--- 1 file changed, 13 insertions(+), 3 deletions(-)
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 54e5317f00f1..63b4d0e6fc29 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c@@ -3580,7 +3580,7 @@ static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_s } static __be32 nfsd4_match_existing_connection(struct svc_rqst *rqst, - struct nfsd4_session *session, u32 req) + struct nfsd4_session *session, u32 req, struct nfsd4_conn **conn) { struct nfs4_client *clp = session->se_client; struct svc_xprt *xpt = rqst->rq_xprt;
@@ -3603,6 +3603,8 @@ static __be32 nfsd4_match_existing_connection(struct svc_rqst *rqst, else status = nfserr_inval; spin_unlock(&clp->cl_lock); + if (status == nfs_ok && conn) + *conn = c; return status; }
@@ -3627,8 +3629,16 @@ __be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp, status = nfserr_wrong_cred; if (!nfsd4_mach_creds_match(session->se_client, rqstp)) goto out; - status = nfsd4_match_existing_connection(rqstp, session, bcts->dir); - if (status == nfs_ok || status == nfserr_inval) + status = nfsd4_match_existing_connection(rqstp, session, + bcts->dir, &conn); + if (status == nfs_ok) { + if (bcts->dir == NFS4_CDFC4_FORE_OR_BOTH || + bcts->dir == NFS4_CDFC4_BACK) + conn->cn_flags |= NFS4_CDFC4_BACK; + nfsd4_probe_callback(session->se_client); + goto out; + } + if (status == nfserr_inval) goto out; status = nfsd4_map_bcts_dir(&bcts->dir); if (status)
--
2.9.5