From: Benjamin Coddington bcodding@redhat.com
stable inclusion from stable-5.10.76 commit 0f4308a164a9de4ffaf86b22082dbdfa16bdc601 bugzilla: 182988 https://gitee.com/openeuler/kernel/issues/I4IAHF
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ Upstream commit c20106944eb679fa3ab7e686fe5f6ba30fbc51e5 ]
If nfsd has existing listening sockets without any processes, then an error returned from svc_create_xprt() for an additional transport will remove those existing listeners. We're seeing this in practice when userspace attempts to create rpcrdma transports without having the rpcrdma modules present before creating nfsd kernel processes. Fix this by checking for existing sockets before calling nfsd_destroy().
Signed-off-by: Benjamin Coddington bcodding@redhat.com Signed-off-by: Chuck Lever chuck.lever@oracle.com Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Chen Jun chenjun102@huawei.com Acked-by: Weilong Chen chenweilong@huawei.com
Signed-off-by: Chen Jun chenjun102@huawei.com --- fs/nfsd/nfsctl.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c index ddf2b375632b..21c4ffda5f94 100644 --- a/fs/nfsd/nfsctl.c +++ b/fs/nfsd/nfsctl.c @@ -792,7 +792,10 @@ static ssize_t __write_ports_addxprt(char *buf, struct net *net, const struct cr svc_xprt_put(xprt); } out_err: - nfsd_destroy(net); + if (!list_empty(&nn->nfsd_serv->sv_permsocks)) + nn->nfsd_serv->sv_nrthreads--; + else + nfsd_destroy(net); return err; }