linux-ext4 - Re: [PATCH 07/11] vfs: add nowait parameter for file

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Date:   Tue, 29 Aug 2023 15:46:13 +0800
From:   Hao Xu <hao.xu@...ux.dev>
To:     Matthew Wilcox <willy@...radead.org>
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>,
        Dave Chinner <david@...morbit.com>,
        "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 07/11] vfs: add nowait parameter for file_accessed()

On 8/28/23 05:32, Matthew Wilcox wrote:
> On Sun, Aug 27, 2023 at 09:28:31PM +0800, Hao Xu wrote:
>> From: Hao Xu <howeyxu@...cent.com>
>>
>> Add a boolean parameter for file_accessed() to support nowait semantics.
>> Currently it is true only with io_uring as its initial caller.
> 
> So why do we need to do this as part of this series?  Apparently it
> hasn't caused any problems for filemap_read().
> 

We need this parameter to indicate if nowait semantics should be 
enforced in touch_atime(), There are locks and maybe IOs in it.