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ublk: Make ublks_max configurable

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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: Mike Christie <michael.christie@oracle.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20231012150600.6198-3-michael.christie@oracle.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Mike Christie 2023-10-12 10:06:00 -05:00 committed by Jens Axboe
parent 56974c07f2
commit 6eba24aeb5
1 changed files with 16 additions and 1 deletions
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17
drivers/block/ublk_drv.c
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@ -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>");