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From: Christoph Hellwig <hch@lst.de>
To: Damien Le Moal <Damien.LeMoal@wdc.com>
Cc: Johannes Thumshirn <Johannes.Thumshirn@wdc.com>,
	"hch@infradead.org" <hch@infradead.org>,
	Christoph Hellwig <hch@lst.de>,
	"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
	Jens Axboe <axboe@kernel.dk>,
	"linux-block@vger.kernel.org" <linux-block@vger.kernel.org>
Subject: Re: [PATCH 2/2] zonefs: use zone-append for AIO as well
Date: Wed, 22 Jul 2020 16:53:01 +0200	[thread overview]
Message-ID: <20200722145301.GB20266@lst.de> (raw)
In-Reply-To: <CY4PR04MB375139CC436B04DDE02B8560E7790@CY4PR04MB3751.namprd04.prod.outlook.com>

On Wed, Jul 22, 2020 at 01:02:14PM +0000, Damien Le Moal wrote:
> That is the general idea. But Christoph point was that reporting the effective
> write offset back to user space can be done not only for zone append, but also
> for regular FS/files that are open with O_APPEND and being written with AIOs,
> legacy or io_uring. Since for this case, the aio->aio_offset field is ignored
> and the kiocb pos is initialized with the file size, then incremented with size
> for the next AIO, the user never actually sees the actual write offset of its
> AIOs. Reporting that back for regular files too can be useful, even though
> current application can do without this (or do not use O_APPEND because it is
> lacking).
> 
> Christoph, please loudly shout at me if I misunderstood you :)

I'd never shout at you :)  But yes, this is correct.

  reply	other threads:[~2020-07-22 14:53 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-20 13:21 [PATCH 0/2] zonefs: use zone-append for aio with rwf append Johannes Thumshirn
2020-07-20 13:21 ` [PATCH 1/2] fs: fix kiocb ki_complete interface Johannes Thumshirn
2020-07-20 13:38   ` Christoph Hellwig
2020-07-20 13:43     ` Damien Le Moal
2020-07-20 13:47       ` Christoph Hellwig
2020-07-20 13:21 ` [PATCH 2/2] zonefs: use zone-append for AIO as well Johannes Thumshirn
2020-07-20 13:45   ` Christoph Hellwig
2020-07-20 16:48     ` Johannes Thumshirn
2020-07-21  5:54       ` Christoph Hellwig
2020-07-22 12:43         ` Johannes Thumshirn
2020-07-22 13:02           ` Damien Le Moal
2020-07-22 14:53             ` Christoph Hellwig [this message]
2020-07-22 14:51           ` Christoph Hellwig
2020-07-22 15:00             ` Johannes Thumshirn
2020-07-24 13:57             ` Kanchan Joshi
2020-07-27  3:12               ` Damien Le Moal
2020-07-21 12:43   ` Kanchan Joshi
2020-07-22 14:32     ` Johannes Thumshirn

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