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