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ublk: introduce UBLK_CMD_TRY_STOP_DEV #448

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subject: ublk: introduce UBLK_CMD_TRY_STOP_DEV
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url: https://patchwork.kernel.org/project/linux-block/list/?series=1037344

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yoavcoh added 2 commits January 8, 2026 09:56
@yoavcoh @kawasaki
ublk: make ublk_ctrl_stop_dev return void
9b8a5f2 
This function always returns 0, so there is no need to return a value.

Signed-off-by: Yoav Cohen <yoav@nvidia.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
@yoavcoh @kawasaki
ublk: add UBLK_CMD_TRY_STOP_DEV command
5875293 
This command is similar to UBLK_CMD_STOP_DEV, but it only stops the
device if there are no active openers for the ublk block device.
If the device is busy, the command returns -EBUSY instead of
disrupting active clients. This allows safe, non-destructive stopping.

Advertise UBLK_CMD_TRY_STOP_DEV support via 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: Ming Lei <ming.lei@redhat.com>
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Upstream branch: aacb0a6
series: https://patchwork.kernel.org/project/linux-block/list/?series=1039134
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@blktests-ci blktests-ci bot force-pushed the series/1037344=>linus-master branch from cd119a2 to 5875293 Compare January 8, 2026 00:56
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