diff options
| author | Yoav Cohen <yoav@nvidia.com> | 2026-01-13 01:05:01 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2026-01-13 01:07:31 +0300 |
| commit | 93ada1b3da398b492c45429cef1a1c9651d5c7ba (patch) | |
| tree | fd6a4acfbb0bb27ecf1a4453cb480d409e9ff469 /include/uapi/linux | |
| parent | 9e386f49fa269298490b303c423c6af4645f184e (diff) | |
| download | linux-93ada1b3da398b492c45429cef1a1c9651d5c7ba.tar.xz | |
ublk: add UBLK_CMD_TRY_STOP_DEV command
Add a best-effort stop command, UBLK_CMD_TRY_STOP_DEV, which only stops a
ublk device when it has no active openers.
Unlike UBLK_CMD_STOP_DEV, this command does not disrupt existing users.
New opens are blocked only after disk_openers has reached zero; if the
device is busy, the command returns -EBUSY and leaves it running.
The ub->block_open flag is used only to close a race with an in-progress
open and does not otherwise change open behavior.
Advertise support via the UBLK_F_SAFE_STOP_DEV feature flag.
Signed-off-by: Yoav Cohen <yoav@nvidia.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/uapi/linux')
| -rw-r--r-- | include/uapi/linux/ublk_cmd.h | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/include/uapi/linux/ublk_cmd.h b/include/uapi/linux/ublk_cmd.h index 61ac5d8e1078..90f47da4f435 100644 --- a/include/uapi/linux/ublk_cmd.h +++ b/include/uapi/linux/ublk_cmd.h @@ -55,7 +55,8 @@ _IOWR('u', 0x15, struct ublksrv_ctrl_cmd) #define UBLK_U_CMD_QUIESCE_DEV \ _IOWR('u', 0x16, struct ublksrv_ctrl_cmd) - +#define UBLK_U_CMD_TRY_STOP_DEV \ + _IOWR('u', 0x17, struct ublksrv_ctrl_cmd) /* * 64bits are enough now, and it should be easy to extend in case of * running out of feature flags @@ -321,6 +322,12 @@ */ #define UBLK_F_INTEGRITY (1ULL << 16) +/* + * The device supports the UBLK_CMD_TRY_STOP_DEV command, which + * allows stopping the device only if there are no openers. + */ +#define UBLK_F_SAFE_STOP_DEV (1ULL << 17) + /* device state */ #define UBLK_S_DEV_DEAD 0 #define UBLK_S_DEV_LIVE 1 |