linux-kernel - Re: [PATCH cgroup] cgroup: set the correct return code if hierarchy limits are reached

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Message-ID: <20220628091648.GA12249@blackbody.suse.cz>
Date:   Tue, 28 Jun 2022 11:16:48 +0200
From:   Michal Koutný <mkoutny@...e.com>
To:     Vasily Averin <vvs@...nvz.org>
Cc:     Roman Gushchin <roman.gushchin@...ux.dev>,
        Shakeel Butt <shakeelb@...gle.com>,
        Michal Hocko <mhocko@...e.com>, Tejun Heo <tj@...nel.org>,
        Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>, kernel@...nvz.org,
        linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        Vlastimil Babka <vbabka@...e.cz>,
        Muchun Song <songmuchun@...edance.com>, cgroups@...r.kernel.org
Subject: Re: [PATCH cgroup] cgroup: set the correct return code if hierarchy
 limits are reached

On Tue, Jun 28, 2022 at 06:59:06AM +0300, Vasily Averin <vvs@...nvz.org> wrote:
> I would agree with you, however in my opinion EAGAIN is used to restart an
> interrupted system call. Thus, I worry its return can loop the user space without
> any chance of continuation.
> 
> However, maybe I'm confusing something?

The mkdir(2) manpage doesn't list EAGAIN at all. ENOSPC makes better
sense here. (And I suspect the dependency on this particular value won't
be very wide spread.)

0.02€
Michal