From: Kanchan Joshi <joshi.k@samsung.com>
To: Damien Le Moal <Damien.LeMoal@wdc.com>
Cc: "axboe@kernel.dk" <axboe@kernel.dk>,
"kbusch@kernel.org" <kbusch@kernel.org>,
"linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"hch@lst.de" <hch@lst.de>,
Selvakumar S <selvakuma.s1@samsung.com>,
Nitesh Shetty <nj.shetty@samsung.com>,
Javier Gonzalez <javier.gonz@samsung.com>
Subject: Re: [PATCH 1/2] block: fix error code for zone-append
Date: Fri, 3 Jul 2020 11:50:55 +0530 [thread overview]
Message-ID: <20200703062055.GA26058@test-zns> (raw)
In-Reply-To: <CY4PR04MB3751B8037BE65D573667A6D5E76A0@CY4PR04MB3751.namprd04.prod.outlook.com>
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On Fri, Jul 03, 2020 at 05:29:50AM +0000, Damien Le Moal wrote:
>On 2020/07/03 0:42, Kanchan Joshi wrote:
>> avoid returning success when it should report failure, preventing
>> odd behavior in caller.
>
>You can be more precise here: the odd behavior is an infinite loop in
>bio_iov_iter_get_pages() whcih is is the only user of __bio_iov_append_get_pages().
Sure. Kept that in cover letter, but missed here.
>>
>> Signed-off-by: Kanchan Joshi <joshi.k@samsung.com>
>> Signed-off-by: Selvakumar S <selvakuma.s1@samsung.com>
>> Signed-off-by: Nitesh Shetty <nj.shetty@samsung.com>
>> Signed-off-by: Javier Gonzalez <javier.gonz@samsung.com>
>> ---
>> block/bio.c | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/block/bio.c b/block/bio.c
>> index a7366c0..0cecdbc 100644
>> --- a/block/bio.c
>> +++ b/block/bio.c
>> @@ -1044,7 +1044,7 @@ static int __bio_iov_append_get_pages(struct bio *bio, struct iov_iter *iter)
>> size_t offset;
>>
>> if (WARN_ON_ONCE(!max_append_sectors))
>> - return 0;
>> + return -EINVAL;
>>
>> /*
>> * Move page array up in the allocated memory for the bio vecs as far as
>>
>
>Note: the odd behavior mentioned in the commit message cannot currently be
>triggered since only zonefs issues REQ_OP_ZONE_APPEND BIOs so we are guaranteed
>that max_append_sectors is not 0 in that case. But this fix certainly makes
>things more solid. So:
Yes, zonefs will not run into this. Future users of zone-append may. I
encountered this endless loop while testing user zone-append path.
>Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
>
>--
>Damien Le Moal
>Western Digital Research
>
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next prev parent reply other threads:[~2020-07-03 6:23 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20200702154204epcas5p15106774a3d556b77050710722da89922@epcas5p1.samsung.com>
2020-07-02 15:38 ` [PATCH 0/2] fix/extend zone-append in block-layer Kanchan Joshi
[not found] ` <CGME20200702154208epcas5p39fe202f642a9d5c8dde9b911645c594c@epcas5p3.samsung.com>
2020-07-02 15:38 ` [PATCH 1/2] block: fix error code for zone-append Kanchan Joshi
2020-07-03 5:29 ` Damien Le Moal
2020-07-03 6:20 ` Kanchan Joshi [this message]
[not found] ` <CGME20200702154213epcas5p4e8d42861cb5ae91ddeccf1ed73107304@epcas5p4.samsung.com>
2020-07-02 15:38 ` [PATCH 2/2] block: enable zone-append for iov_iter of bvec type Kanchan Joshi
2020-07-03 5:32 ` Damien Le Moal
2020-07-03 6:53 ` Kanchan Joshi
2020-07-03 8:07 ` Damien Le Moal
2020-07-03 13:02 ` Johannes Thumshirn
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