ceph: check availability of mds cluster on mount after wait timeout (97820058) · Commits · 戴 / test

If all the MDS daemons are down for some reason, then the first mount attempt will fail with EIO after the mount request times out. A mount attempt will also fail with EIO if all of the MDS's are laggy. This patch changes the code to return -EHOSTUNREACH in these situations and adds a pr_info error message to help the admin determine the cause. URL: https://tracker.ceph.com/issues/4386 Signed-off-by:

Xiubo Li <xiubli@redhat.com> Reviewed-by:

Jeff Layton <jlayton@kernel.org> Signed-off-by:

Ilya Dryomov <idryomov@gmail.com>

fs/ceph/mds_client.c

+1 −2

Original line number	Original line	Diff line number	Diff line
	@@ -2583,8 +2583,7 @@ static void __do_request(struct ceph_mds_client *mdsc,
	if (!(mdsc->fsc->mount_options->flags &		if (!(mdsc->fsc->mount_options->flags &
	CEPH_MOUNT_OPT_MOUNTWAIT) &&		CEPH_MOUNT_OPT_MOUNTWAIT) &&
	!ceph_mdsmap_is_cluster_available(mdsc->mdsmap)) {		!ceph_mdsmap_is_cluster_available(mdsc->mdsmap)) {
	err = -ENOENT;		err = -EHOSTUNREACH;
	pr_info("probably no mds server is up\n");
	goto finish;		goto finish;
	}		}
	}		}

fs/ceph/super.c

+5 −0

Original line number	Original line	Diff line number	Diff line
	@@ -1070,6 +1070,11 @@ static int ceph_get_tree(struct fs_context *fc)
	return 0;		return 0;

	out_splat:		out_splat:
			if (!ceph_mdsmap_is_cluster_available(fsc->mdsc->mdsmap)) {
			pr_info("No mds server is up or the cluster is laggy\n");
			err = -EHOSTUNREACH;
			}

	ceph_mdsc_close_sessions(fsc->mdsc);		ceph_mdsc_close_sessions(fsc->mdsc);
	deactivate_locked_super(sb);		deactivate_locked_super(sb);
	goto out_final;		goto out_final;

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