Commit 6eba24ae authored by Mike Christie's avatar Mike Christie Committed by Jens Axboe
Browse files

ublk: Make ublks_max configurable 



We are converting tcmu applications to ublk, but have systems with up
to 1k devices. This patch allows us to configure the ublks_max from
userspace with the ublks_max modparam.

Signed-off-by: default avatarMike Christie <michael.christie@oracle.com>
Reviewed-by: default avatarMing Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20231012150600.6198-3-michael.christie@oracle.com


Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 56974c07

drivers/block/ublk_drv.c

+16 −1
Original line number Diff line number Diff line
@@ -2940,7 +2940,22 @@ static void __exit ublk_exit(void) 
module_init(ublk_init);

module_exit(ublk_exit);



module_param(ublks_max, int, 0444);

static int ublk_set_max_ublks(const char *buf, const struct kernel_param *kp)

{

	return param_set_uint_minmax(buf, kp, 0, UBLK_MAX_UBLKS);

}



static int ublk_get_max_ublks(char *buf, const struct kernel_param *kp)

{

	return sysfs_emit(buf, "%u\n", ublks_max);

}



static const struct kernel_param_ops ublk_max_ublks_ops = {

	.set = ublk_set_max_ublks,

	.get = ublk_get_max_ublks,

};



module_param_cb(ublks_max, &ublk_max_ublks_ops, &ublks_max, 0644);

MODULE_PARM_DESC(ublks_max, "max number of ublk devices allowed to add(default: 64)");



MODULE_AUTHOR("Ming Lei <ming.lei@redhat.com>");