lkml.org 
[lkml]   [2021]   [Jul]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH AUTOSEL 5.12 064/160] block: introduce BIO_ZONE_WRITE_LOCKED bio flag
    Date
    From: Damien Le Moal <damien.lemoal@wdc.com>

    [ Upstream commit 9ffbbb435d8f566a0924ce4b5dc7fc1bceb6dbf8 ]

    Introduce the BIO flag BIO_ZONE_WRITE_LOCKED to indicate that a BIO owns
    the write lock of the zone it is targeting. This is the counterpart of
    the struct request flag RQF_ZONE_WRITE_LOCKED.

    This new BIO flag is reserved for now for zone write locking control
    for device mapper targets exposing a zoned block device. Since in this
    case, the lock flag must not be propagated to the struct request that
    will be used to process the BIO, a BIO private flag is used rather than
    changing the RQF_ZONE_WRITE_LOCKED request flag into a common REQ_XXX
    flag that could be used for both BIO and request. This avoids conflicts
    down the stack with the block IO scheduler zone write locking
    (in mq-deadline).

    Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
    Reviewed-by: Christoph Hellwig <hch@lst.de>
    Reviewed-by: Hannes Reinecke <hare@suse.de>
    Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
    Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
    Acked-by: Jens Axboe <axboe@kernel.dk>
    Signed-off-by: Mike Snitzer <snitzer@redhat.com>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    include/linux/blk_types.h | 1 +
    1 file changed, 1 insertion(+)

    diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
    index db026b6ec15a..e5cf12f102a2 100644
    --- a/include/linux/blk_types.h
    +++ b/include/linux/blk_types.h
    @@ -304,6 +304,7 @@ enum {
    BIO_CGROUP_ACCT, /* has been accounted to a cgroup */
    BIO_TRACKED, /* set if bio goes through the rq_qos path */
    BIO_REMAPPED,
    + BIO_ZONE_WRITE_LOCKED, /* Owns a zoned device zone write lock */
    BIO_FLAG_LAST
    };

    --
    2.30.2
    \
     
     \ /
      Last update: 2021-07-06 13:40    [W:4.598 / U:0.164 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site