• Joe Thornber's avatar
    dm bio prison: add dm_cell_promote_or_release() · 3cdf93f9
    Joe Thornber authored
    Rather than always releasing the prisoners in a cell, the client may
    want to promote one of them to be the new holder.  There is a race here
    though between releasing an empty cell, and other threads adding new
    inmates.  So this function makes the decision with its lock held.
    
    This function can have two outcomes:
    i)  An inmate is promoted to be the holder of the cell (return value of 0).
    ii) The cell has no inmate for promotion and is released (return value of 1).
    Signed-off-by: default avatarJoe Thornber <ejt@redhat.com>
    Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
    3cdf93f9
dm-bio-prison.h 4.45 KB