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Subject: Re: [v2] ceph: if we are blacklisted, __do_request returns directly
From:   Jeff Layton <jlayton@kernel.org>
To:     Yanhu Cao <gmayyyha@gmail.com>
Cc:     sage@redhat.com, idryomov@gmail.com, ceph-devel@vger.kernel.org,
        linux-kernel@vger.kernel.org
Date:   Fri, 17 Apr 2020 06:41:27 -0400
In-Reply-To: <20200417093626.10892-1-gmayyyha@gmail.com>
References: <20200417093626.10892-1-gmayyyha@gmail.com>
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On Fri, 2020-04-17 at 17:36 +0800, Yanhu Cao wrote:
> If we mount cephfs by the recover_session option,
> __do_request can return directly until the client automatically reconnects.
> 
> Signed-off-by: Yanhu Cao <gmayyyha@gmail.com>
> ---
>  fs/ceph/mds_client.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
> index 486f91f9685b..e6cda256b136 100644
> --- a/fs/ceph/mds_client.c
> +++ b/fs/ceph/mds_client.c
> @@ -2708,6 +2708,12 @@ static void __do_request(struct ceph_mds_client *mdsc,
>  
>  	put_request_session(req);
>  
> +	if (mdsc->fsc->blacklisted &&
> +	    ceph_test_mount_opt(mdsc->fsc, CLEANRECOVER)) {
> +		err = -EACCES;
> +		goto finish;
> +	}
> +
>  	mds = __choose_mds(mdsc, req, &random);
>  	if (mds < 0 ||
>  	    ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {

We do have an EBLACKLISTED error defined, which is the same as
ESHUTDOWN. The read and write code can return that when the client is
blacklisted. Same for cap handling (in __ceph_pool_perm_get. Should this
return -EBLACKLISTED instead?

-- 
Jeff Layton <jlayton@kernel.org>