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

[Josef Bacik]

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@xxxxxxx>
> Signed-off-by: Naohiro Aota <naohiro.aota@xxxxxxx>
> ---
>  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