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

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Message-ID: <20190613135759.22siaadm7l4gz2ri@MacBook-Pro-91.local>
Date:   Thu, 13 Jun 2019 09:58:00 -0400
From:   Josef Bacik <josef@...icpanda.com>
To:     Naohiro Aota <naohiro.aota@....com>
Cc:     linux-btrfs@...r.kernel.org, David Sterba <dsterba@...e.com>,
        Chris Mason <clm@...com>, Josef Bacik <josef@...icpanda.com>,
        Qu Wenruo <wqu@...e.com>, Nikolay Borisov <nborisov@...e.com>,
        linux-kernel@...r.kernel.org, Hannes Reinecke <hare@...e.com>,
        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 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