linux-kernel - EMFILE/ENFILE mitigation needed in erofs?

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Message-ID: <1447543.1650552898@warthog.procyon.org.uk>
Date:   Thu, 21 Apr 2022 15:54:58 +0100
From:   David Howells <dhowells@...hat.com>
To:     Jeffle Xu <jefflexu@...ux.alibaba.com>
Cc:     dhowells@...hat.com, linux-cachefs@...hat.com, xiang@...nel.org,
        chao@...nel.org, linux-erofs@...ts.ozlabs.org,
        torvalds@...ux-foundation.org, gregkh@...uxfoundation.org,
        willy@...radead.org, linux-fsdevel@...r.kernel.org,
        joseph.qi@...ux.alibaba.com, bo.liu@...ux.alibaba.com,
        tao.peng@...ux.alibaba.com, gerry@...ux.alibaba.com,
        eguan@...ux.alibaba.com, linux-kernel@...r.kernel.org,
        luodaowen.backend@...edance.com, tianzichen@...ishou.com,
        fannaihao@...du.com, zhangjiachen.jaycee@...edance.com
Subject: EMFILE/ENFILE mitigation needed in erofs?

Jeffle Xu <jefflexu@...ux.alibaba.com> wrote:

> +	fd_install(fd, file);

Do you need to mitigate potential EMFILE/ENFILE problems?  You're potentially
trebling up the number of accounted systemwide fds: one for erofs itself, one
anonfd per cache object file to communicate with the daemon and one in the
daemon to talk to the server.  Cachefiles has a fourth internally, but it's
kept off the books - further, cachefiles closes them fairly quickly after a
period of nonuse.

David