linux-kernel - Re: [PATCH 28/29] xfs: support nowait semantics for xc_ctx_lock in xlog_cil

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Message-ID: <ZOkkT5Ai7wyMGcWC@dread.disaster.area>
Date:   Sat, 26 Aug 2023 07:59:43 +1000
From:   Dave Chinner <david@...morbit.com>
To:     Hao Xu <hao.xu@...ux.dev>
Cc:     io-uring@...r.kernel.org, Jens Axboe <axboe@...nel.dk>,
        Dominique Martinet <asmadeus@...ewreck.org>,
        Pavel Begunkov <asml.silence@...il.com>,
        Christian Brauner <brauner@...nel.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Stefan Roesch <shr@...com>, Clay Harris <bugs@...ycon.org>,
        "Darrick J . Wong" <djwong@...nel.org>,
        linux-fsdevel@...r.kernel.org, linux-xfs@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-cachefs@...hat.com,
        ecryptfs@...r.kernel.org, linux-nfs@...r.kernel.org,
        linux-unionfs@...r.kernel.org, bpf@...r.kernel.org,
        netdev@...r.kernel.org, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-btrfs@...r.kernel.org, codalist@...a.cs.cmu.edu,
        linux-f2fs-devel@...ts.sourceforge.net, cluster-devel@...hat.com,
        linux-mm@...ck.org, linux-nilfs@...r.kernel.org,
        devel@...ts.orangefs.org, linux-cifs@...r.kernel.org,
        samba-technical@...ts.samba.org, linux-mtd@...ts.infradead.org,
        Wanpeng Li <wanpengli@...cent.com>
Subject: Re: [PATCH 28/29] xfs: support nowait semantics for xc_ctx_lock in
 xlog_cil_commit()

On Fri, Aug 25, 2023 at 09:54:30PM +0800, Hao Xu wrote:
> From: Hao Xu <howeyxu@...cent.com>
> 
> Apply trylock logic for xc_ctx_lock in xlog_cil_commit() in nowait
> case and error out -EAGAIN for xlog_cil_commit().

Again, fundamentally broken. Any error from xlog_cil_commit() will
result in a filesystem shutdown as we cannot back out from failure
with dirty log items gracefully at this point.

-Dave.

-- 
Dave Chinner
david@...morbit.com