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    SubjectRe: [PATCH 09/19] btrfs: limit super block locations in HMZONED mode
    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@wdc.com>
    > Signed-off-by: Naohiro Aota <naohiro.aota@wdc.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

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