On Tue, Jan 26, 2021 at 4:24 AM Petr Vorel <pvorel@xxxxxxx> wrote: > > Hi, > > > Currently, loop device has only one global lock: > > loop_ctl_mutex. > > > This becomes hot in scenarios where many loop devices are used. > > > Scale it by introducing per-device lock: lo_mutex that protects the > > fields in struct loop_device. Keep loop_ctl_mutex to protect global > > data such as loop_index_idr, loop_lookup, loop_add. > > > Lock ordering: loop_ctl_mutex > lo_mutex. > > Reviewed-by: Petr Vorel <pvorel@xxxxxxx> Thank you for reviewing this patch. Pasha
