linux-kernel - Re: [PATCH 02/19] btrfs: Get zone information of zoned block devices

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Date:   Tue, 18 Jun 2019 06:04:21 +0000
From:   Naohiro Aota <Naohiro.Aota@....com>
To:     Josef Bacik <josef@...icpanda.com>
CC:     "linux-btrfs@...r.kernel.org" <linux-btrfs@...r.kernel.org>,
        David Sterba <dsterba@...e.com>, Chris Mason <clm@...com>,
        Qu Wenruo <wqu@...e.com>, Nikolay Borisov <nborisov@...e.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Hannes Reinecke <hare@...e.com>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        Damien Le Moal <Damien.LeMoal@....com>,
        Matias Bjørling <mb@...htnvm.io>,
        Johannes Thumshirn <jthumshirn@...e.de>,
        Bart Van Assche <bvanassche@....org>
Subject: Re: [PATCH 02/19] btrfs: Get zone information of zoned block devices

On 2019/06/13 22:58, Josef Bacik wrote:
> On Fri, Jun 07, 2019 at 10:10:08PM +0900, Naohiro Aota wrote:
>> If a zoned block device is found, get its zone information (number of zones
>> and zone size) using the new helper function btrfs_get_dev_zonetypes().  To
>> avoid costly run-time zone report commands to test the device zones type
>> during block allocation, attach the seqzones bitmap to the device structure
>> to indicate if a zone is sequential or accept random writes.
>>
>> This patch also introduces the helper function btrfs_dev_is_sequential() to
>> test if the zone storing a block is a sequential write required zone.
>>
>> Signed-off-by: Damien Le Moal <damien.lemoal@....com>
>> Signed-off-by: Naohiro Aota <naohiro.aota@....com>
>> ---
>>   fs/btrfs/volumes.c | 143 +++++++++++++++++++++++++++++++++++++++++++++
>>   fs/btrfs/volumes.h |  33 +++++++++++
>>   2 files changed, 176 insertions(+)
>>
> 
> We have enough problems with giant files already, please just add a separate
> hmzoned.c or whatever and put all the zone specific code in there.  That'll save
> me time when I go and break a bunch of stuff out.  Thanks,
> 
> Josef
> 

Thank you for the reviews.

I'll add hmzoned.c and put the things (with more helpers/abstraction) there in the next version.

Thanks.