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ublk: add UBLK_F_NO_AUTO_PART_SCAN feature flag

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Add a new feature flag UBLK_F_NO_AUTO_PART_SCAN to allow users to suppress
automatic partition scanning when starting a ublk device.

This is useful for some cases in which user don't want to scan
partitions.

Users still can manually trigger partition scanning later when appropriate
using standard tools (e.g., partprobe, blockdev --rereadpt).

Reported-by: Yoav Cohen <yoav@nvidia.com>
Link: https://lore.kernel.org/linux-block/DM4PR12MB63280C5637917C071C2F0D65A9A8A@DM4PR12MB6328.namprd12.prod.outlook.com/
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ming Lei 2026-01-30 00:19:51 +08:00 • committed by Jens Axboe
parent 66d3af8d5d
commit 8443e2087e
2 changed files with 13 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

14
drivers/block/ublk_drv.c
View file

@ -80,7 +80,8 @@
| UBLK_F_BUF_REG_OFF_DAEMON \
| (IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY) ? UBLK_F_INTEGRITY : 0) \
| UBLK_F_SAFE_STOP_DEV \
| UBLK_F_BATCH_IO)
| UBLK_F_BATCH_IO \
| UBLK_F_NO_AUTO_PART_SCAN)
#define UBLK_F_ALL_RECOVERY_FLAGS (UBLK_F_USER_RECOVERY \
| UBLK_F_USER_RECOVERY_REISSUE \
@ -4430,9 +4431,14 @@ static int ublk_ctrl_start_dev(struct ublk_device *ub,
set_bit(UB_STATE_USED, &ub->state);
/* Schedule async partition scan for trusted daemons */
if (!ub->unprivileged_daemons)
schedule_work(&ub->partition_scan_work);
/* Skip partition scan if disabled by user */
if (ub->dev_info.flags & UBLK_F_NO_AUTO_PART_SCAN) {
clear_bit(GD_SUPPRESS_PART_SCAN, &disk->state);
} else {
/* Schedule async partition scan for trusted daemons */
if (!ub->unprivileged_daemons)
schedule_work(&ub->partition_scan_work);
}
out_put_cdev:
if (ret) {

3
include/uapi/linux/ublk_cmd.h
View file

@ -367,6 +367,9 @@
*/
#define UBLK_F_SAFE_STOP_DEV (1ULL << 17)
/* Disable automatic partition scanning when device is started */
#define UBLK_F_NO_AUTO_PART_SCAN (1ULL << 18)
/* device state */
#define UBLK_S_DEV_DEAD 0
#define UBLK_S_DEV_LIVE 1