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ceph: check availability of mds cluster on mount after wait timeout

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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>
This commit is contained in:
Xiubo Li 2019-12-10 20:29:40 -05:00 committed by Ilya Dryomov
parent 4d681c2f91
commit 97820058fb
2 changed files with 6 additions and 2 deletions
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3
fs/ceph/mds_client.c
View file

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

5
fs/ceph/super.c
View file

@ -1070,6 +1070,11 @@ static int ceph_get_tree(struct fs_context *fc)
return 0;
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);
deactivate_locked_super(sb);
goto out_final;