• Lukas Czerner's avatar
    dm thin: update discard_granularity to reflect the thin-pool blocksize · 09869de5
    Lukas Czerner authored
    DM thinp already checks whether the discard_granularity of the data
    device is a factor of the thin-pool block size.  But when using the
    dm-thin-pool's discard passdown support, DM thinp was not selecting the
    max of the underlying data device's discard_granularity and the
    thin-pool's block size.
    
    Update set_discard_limits() to set discard_granularity to the max of
    these values.  This enables blkdev_issue_discard() to properly align the
    discards that are sent to the DM thin device on a full block boundary.
    As such each discard will now cover an entire DM thin-pool block and the
    block will be reclaimed.
    Reported-by: default avatarZdenek Kabelac <zkabelac@redhat.com>
    Signed-off-by: default avatarLukas Czerner <lczerner@redhat.com>
    Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
    Cc: stable@vger.kernel.org
    09869de5
dm-thin.c 87.6 KB