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> Kind regards, Petr
