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From: "Javier González" <javier@javigon.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: Kanchan Joshi <joshi.k@samsung.com>,
	axboe@kernel.dk, viro@zeniv.linux.org.uk, bcrl@kvack.org,
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-aio@kvack.org, io-uring@vger.kernel.org,
	linux-block@vger.kernel.org, selvakuma.s1@samsung.com,
	nj.shetty@samsung.com
Subject: Re: [PATCH 0/3] zone-append support in aio and io-uring
Date: Thu, 18 Jun 2020 10:29:21 +0200	[thread overview]
Message-ID: <20200618082921.zyc37cod2uhabd4e@mpHalley.local> (raw)
In-Reply-To: <20200618065634.GB24943@infradead.org>

On 17.06.2020 23:56, Christoph Hellwig wrote:
>On Wed, Jun 17, 2020 at 10:53:36PM +0530, Kanchan Joshi wrote:
>> This patchset enables issuing zone-append using aio and io-uring direct-io interface.
>>
>> For aio, this introduces opcode IOCB_CMD_ZONE_APPEND. Application uses start LBA
>> of the zone to issue append. On completion 'res2' field is used to return
>> zone-relative offset.
>>
>> For io-uring, this introduces three opcodes: IORING_OP_ZONE_APPEND/APPENDV/APPENDV_FIXED.
>> Since io_uring does not have aio-like res2, cqe->flags are repurposed to return zone-relative offset
>
>And what exactly are the semantics supposed to be?  Remember the
>unix file abstractions does not know about zones at all.
>
>I really don't think squeezing low-level not quite block storage
>protocol details into the Linux read/write path is a good idea.
>
>What could be a useful addition is a way for O_APPEND/RWF_APPEND writes
>to report where they actually wrote, as that comes close to Zone Append
>while still making sense at our usual abstraction level for file I/O.

Makes sense. We will look into this for a V2.

Thanks,
Javier

  reply	other threads:[~2020-06-18  8:29 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20200617172653epcas5p488de50090415eb802e62acc0e23d8812@epcas5p4.samsung.com>
2020-06-17 17:23 ` [PATCH 0/3] zone-append support in aio and io-uring Kanchan Joshi
     [not found]   ` <CGME20200617172702epcas5p4dbf4729d31d9a85ab1d261d04f238e61@epcas5p4.samsung.com>
2020-06-17 17:23     ` [PATCH 1/3] fs,block: Introduce IOCB_ZONE_APPEND and direct-io handling Kanchan Joshi
2020-06-17 19:02       ` Pavel Begunkov
2020-06-18  7:16       ` Damien Le Moal
2020-06-18 18:35         ` Kanchan Joshi
     [not found]   ` <CGME20200617172706epcas5p4dcbc164063f58bad95b211b9d6dfbfa9@epcas5p4.samsung.com>
2020-06-17 17:23     ` [PATCH 2/3] aio: add support for zone-append Kanchan Joshi
2020-06-18  7:33       ` Damien Le Moal
     [not found]   ` <CGME20200617172713epcas5p352f2907a12bd4ee3c97be1c7d8e1569e@epcas5p3.samsung.com>
2020-06-17 17:23     ` [PATCH 3/3] io_uring: " Kanchan Joshi
2020-06-17 18:55       ` Pavel Begunkov
2020-06-18  7:39       ` Damien Le Moal
2020-06-18  8:35         ` javier.gonz@samsung.com
2020-06-18  8:47           ` Damien Le Moal
2020-06-18  9:11             ` javier.gonz@samsung.com
2020-06-19  9:41               ` javier.gonz@samsung.com
2020-06-19 11:15                 ` Matias Bjørling
2020-06-19 14:18                   ` Jens Axboe
2020-06-19 15:14                     ` Matias Bjørling
2020-06-19 15:20                       ` Jens Axboe
2020-06-19 15:40                         ` Matias Bjørling
2020-06-19 15:44                           ` Jens Axboe
2020-06-21 18:55                             ` javier.gonz@samsung.com
2020-06-19 14:15                 ` Jens Axboe
2020-06-19 14:59                   ` Pavel Begunkov
2020-06-19 15:02                     ` Jens Axboe
2020-06-21 18:52                       ` javier.gonz@samsung.com
2020-06-17 17:42   ` [PATCH 0/3] zone-append support in aio and io-uring Matthew Wilcox
2020-06-18  6:56   ` Christoph Hellwig
2020-06-18  8:29     ` Javier González [this message]
2020-06-18 17:52     ` Kanchan Joshi
2020-06-19  3:08       ` Damien Le Moal
2020-06-19  7:56       ` Christoph Hellwig
2020-06-18  8:04   ` Matias Bjørling
2020-06-18  8:27     ` Javier González
2020-06-18  8:32       ` Matias Bjørling
2020-06-18  8:39         ` Javier González
2020-06-18  8:46           ` Matias Bjørling
2020-06-18 14:16     ` Christoph Hellwig
2020-06-18 19:21     ` Kanchan Joshi
2020-06-18 20:04       ` Matias Bjørling
2020-06-19  1:03         ` Damien Le Moal

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