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From: Damien Le Moal <Damien.LeMoal@wdc.com>
To: Kanchan Joshi <joshi.k@samsung.com>
Cc: "axboe@kernel.dk" <axboe@kernel.dk>,
	"viro@zeniv.linux.org.uk" <viro@zeniv.linux.org.uk>,
	"bcrl@kvack.org" <bcrl@kvack.org>,
	"asml.silence@gmail.com" <asml.silence@gmail.com>,
	"hch@infradead.org" <hch@infradead.org>,
	"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
	"mb@lightnvm.io" <mb@lightnvm.io>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-aio@kvack.org" <linux-aio@kvack.org>,
	"io-uring@vger.kernel.org" <io-uring@vger.kernel.org>,
	"linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
	"selvakuma.s1@samsung.com" <selvakuma.s1@samsung.com>,
	"nj.shetty@samsung.com" <nj.shetty@samsung.com>,
	"javier.gonz@samsung.com" <javier.gonz@samsung.com>,
	Arnav Dawn <a.dawn@samsung.com>
Subject: Re: [PATCH v2 1/2] fs,block: Introduce RWF_ZONE_APPEND and handling in direct IO path
Date: Tue, 30 Jun 2020 00:37:07 +0000
Message-ID: <CY4PR04MB3751213DD4B370F58A63368BE76F0@CY4PR04MB3751.namprd04.prod.outlook.com> (raw)
In-Reply-To: <20200629183202.GA24003@test-zns>

On 2020/06/30 3:35, Kanchan Joshi wrote:
> On Fri, Jun 26, 2020 at 02:50:20AM +0000, Damien Le Moal wrote:
>> On 2020/06/26 2:18, Kanchan Joshi wrote:
>>> Introduce RWF_ZONE_APPEND flag to represent zone-append. User-space
>>> sends this with write. Add IOCB_ZONE_APPEND which is set in
>>> kiocb->ki_flags on receiving RWF_ZONE_APPEND.
>>> Make direct IO submission path use IOCB_ZONE_APPEND to send bio with
>>> append op. Direct IO completion returns zone-relative offset, in sector
>>> unit, to upper layer using kiocb->ki_complete interface.
>>> Report error if zone-append is requested on regular file or on sync
>>> kiocb (i.e. one without ki_complete).
>>>
>>> Signed-off-by: Kanchan Joshi <joshi.k@samsung.com>
>>> Signed-off-by: SelvaKumar S <selvakuma.s1@samsung.com>
>>> Signed-off-by: Arnav Dawn <a.dawn@samsung.com>
>>> Signed-off-by: Nitesh Shetty <nj.shetty@samsung.com>
>>> Signed-off-by: Javier Gonzalez <javier.gonz@samsung.com>
>>> ---
>>>  fs/block_dev.c          | 28 ++++++++++++++++++++++++----
>>>  include/linux/fs.h      |  9 +++++++++
>>>  include/uapi/linux/fs.h |  5 ++++-
>>>  3 files changed, 37 insertions(+), 5 deletions(-)
>>>
>>> diff --git a/fs/block_dev.c b/fs/block_dev.c
>>> index 47860e5..5180268 100644
>>> --- a/fs/block_dev.c
>>> +++ b/fs/block_dev.c
>>> @@ -185,6 +185,10 @@ static unsigned int dio_bio_write_op(struct kiocb *iocb)
>>>  	/* avoid the need for a I/O completion work item */
>>>  	if (iocb->ki_flags & IOCB_DSYNC)
>>>  		op |= REQ_FUA;
>>> +
>>> +	if (iocb->ki_flags & IOCB_ZONE_APPEND)
>>> +		op |= REQ_OP_ZONE_APPEND;
>>
>> This is wrong. REQ_OP_WRITE is already set in the declaration of "op". How can
>> this work ?
> REQ_OP_ZONE_APPEND will override the REQ_WRITE op, while previously set op
> flags (REQ_FUA etc.) will be retained. But yes, this can be made to look
> cleaner.
> V3 will include the other changes you pointed out. Thanks for the review.
> 

REQ_OP_WRITE and REQ_OP_ZONE_APPEND are different bits, so there is no
"override". A well formed BIO bi_opf is one op+flags. Specifying multiple OP
codes does not make sense.

-- 
Damien Le Moal
Western Digital Research

  reply index

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20200625171829epcas5p268486a0780571edb4999fc7b3caab602@epcas5p2.samsung.com>
2020-06-25 17:15 ` [PATCH v2 0/2] zone-append support in io-uring and aio Kanchan Joshi
     [not found]   ` <CGME20200625171834epcas5p226a24dfcb84cfa83fe29a2bd17795d85@epcas5p2.samsung.com>
2020-06-25 17:15     ` [PATCH v2 1/2] fs,block: Introduce RWF_ZONE_APPEND and handling in direct IO path Kanchan Joshi
2020-06-26  2:50       ` Damien Le Moal
2020-06-29 18:32         ` Kanchan Joshi
2020-06-30  0:37           ` Damien Le Moal [this message]
2020-06-30  7:40             ` Kanchan Joshi
2020-06-30  7:52               ` Damien Le Moal
2020-06-30  7:56                 ` Damien Le Moal
2020-06-30  8:16                   ` Kanchan Joshi
2020-06-26  8:58       ` Christoph Hellwig
2020-06-26 21:15         ` Kanchan Joshi
2020-06-27  6:51           ` Christoph Hellwig
     [not found]   ` <CGME20200625171838epcas5p449183e12770187142d8d55a9bf422a8d@epcas5p4.samsung.com>
2020-06-25 17:15     ` [PATCH v2 2/2] io_uring: add support for zone-append Kanchan Joshi
2020-06-25 19:40       ` Pavel Begunkov
2020-06-26  3:11   ` [PATCH v2 0/2] zone-append support in io-uring and aio Damien Le Moal
2020-06-26  6:37     ` javier.gonz
2020-06-26  6:56       ` Damien Le Moal
2020-06-26  7:03         ` javier.gonz@samsung.com
2020-06-26 22:15     ` Kanchan Joshi
2020-06-30 12:46   ` Matthew Wilcox

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