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From:   "Kohada.Tetsuhiro@dc.MitsubishiElectric.co.jp" 
        <Kohada.Tetsuhiro@dc.MitsubishiElectric.co.jp>
To:     "Yuezhang.Mo@sony.com" <Yuezhang.Mo@sony.com>,
        Namjae Jeon <linkinjeon@kernel.org>
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        "linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "Andy.Wu@sony.com" <Andy.Wu@sony.com>,
        "Wataru.Aoyama@sony.com" <Wataru.Aoyama@sony.com>
Subject: Re: [PATCH v2] exfat: do not clear VolumeDirty in writeback
Thread-Topic: [PATCH v2] exfat: do not clear VolumeDirty in writeback
Thread-Index: Adg0Vskc+T+8E+65Sm+jIEZBsmb4mgAqgpIBAL5OAAAARKJNoAA1uDUS
Date:   Thu, 17 Mar 2022 09:47:42 +0000
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Hi Yuezhang.Mo=0A=
=0A=
> exfat_clear_volume_dirty() is only called in sync or umount context.=0A=
> In sync or umount context, all requests will be issued with REQ_SYNC rega=
rdless of whether REQ_SYNC is=0A=
> set when submitting buffer.=0A=
> =0A=
> And since the request of set VolumeDirty is issued with REQ_SYNC. So for =
simplicity, call sync_dirty_buffer()=0A=
> unconditionally.=0A=
=0A=
REQ_FUA and REQ_PREFLUSH may not make much sense on SD cards or USB sticks.=
=0A=
However, the behavior of SCSI/ATAPI type devices with lazy write cache is=
=0A=
 - Issue the SYNCHRONIZE_CACHE command to write all the data to the medium.=
=0A=
 - Issue a WRITE command with FORCE_UNIT_ACCESS (device does not use write =
cache) for the boot sector.=0A=
This guarantees a strict write order.=0A=
=0A=
BR=0A=
T.Kohada=0A=