linux-kernel - Re: [PATCH 09/19] btrfs: limit super block locations in HMZONED mode

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Date:   Tue, 18 Jun 2019 08:51:14 +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 09/19] btrfs: limit super block locations in HMZONED mode

On 2019/06/13 23:13, Josef Bacik wrote:
> On Fri, Jun 07, 2019 at 10:10:15PM +0900, Naohiro Aota wrote:
>> When in HMZONED mode, make sure that device super blocks are located in
>> randomly writable zones of zoned block devices. That is, do not write super
>> blocks in sequential write required zones of host-managed zoned block
>> devices as update would not be possible.
>>
>> Signed-off-by: Damien Le Moal <damien.lemoal@....com>
>> Signed-off-by: Naohiro Aota <naohiro.aota@....com>
>> ---
>>   fs/btrfs/disk-io.c     | 11 +++++++++++
>>   fs/btrfs/disk-io.h     |  1 +
>>   fs/btrfs/extent-tree.c |  4 ++++
>>   fs/btrfs/scrub.c       |  2 ++
>>   4 files changed, 18 insertions(+)
>>
>> diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
>> index 7c1404c76768..ddbb02906042 100644
>> --- a/fs/btrfs/disk-io.c
>> +++ b/fs/btrfs/disk-io.c
>> @@ -3466,6 +3466,13 @@ struct buffer_head *btrfs_read_dev_super(struct block_device *bdev)
>>   	return latest;
>>   }
>>   
>> +int btrfs_check_super_location(struct btrfs_device *device, u64 pos)
>> +{
>> +	/* any address is good on a regular (zone_size == 0) device */
>> +	/* non-SEQUENTIAL WRITE REQUIRED zones are capable on a zoned device */
> 
> This is not how you do multi-line comments in the kernel.  Thanks,
> 
> Josef
> 

Thanks. I'll fix the style.
# I thought the checkpatch was catching this ...