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| author | Mike Christie <michael.christie@oracle.com> | 2023-10-12 17:06:00 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2023-10-17 16:27:24 +0200 |
| commit | 6eba24aeb5e2fc582dd83021795befc1adaede20 (patch) | |
| tree | 28a5d15780ca4c886d949335a0df5f504e4aa3d7 /drivers/block | |
| parent | ublk: Limit dev_id/ub_number values (diff) | |
| download | linux-6eba24aeb5e2fc582dd83021795befc1adaede20.tar.xz linux-6eba24aeb5e2fc582dd83021795befc1adaede20.zip | |
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: 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>
Diffstat (limited to 'drivers/block')
| -rw-r--r-- | drivers/block/ublk_drv.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c index ba7c6f9ee136..b0bbda08ad45 100644 --- a/drivers/block/ublk_drv.c +++ b/drivers/block/ublk_drv.c @@ -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>"); |