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Date:   Tue, 29 Aug 2023 15:46:13 +0800
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Subject: Re: [PATCH 07/11] vfs: add nowait parameter for file_accessed()
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To:     Matthew Wilcox <willy@infradead.org>
Cc:     io-uring@vger.kernel.org, Jens Axboe <axboe@kernel.dk>,
        Dominique Martinet <asmadeus@codewreck.org>,
        Pavel Begunkov <asml.silence@gmail.com>,
        Christian Brauner <brauner@kernel.org>,
        Alexander Viro <viro@zeniv.linux.org.uk>,
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        Wanpeng Li <wanpengli@tencent.com>
References: <20230827132835.1373581-1-hao.xu@linux.dev>
 <20230827132835.1373581-8-hao.xu@linux.dev>
 <ZOvA5DJDZN0FRymp@casper.infradead.org>
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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@tencent.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.