Re: [PATCH] ublk: set_params: properly check if parameters can be applied

[Jens Axboe <axboe@kernel.dk>]

On Tue, 04 Mar 2025 14:34:26 -0700, Uday Shankar wrote:
> The parameters set by the set_params call are only applied to the block
> device in the start_dev call. So if a device has already been started, a
> subsequently issued set_params on that device will not have the desired
> effect, and should return an error. There is an existing check for this
> - set_params fails on devices in the LIVE state. But this check is not
> sufficient to cover the recovery case. In this case, the device will be
> in the QUIESCED or FAIL_IO states, so set_params will succeed. But this
> success is misleading, because the parameters will not be applied, since
> the device has already been started (by a previous ublk server). The bit
> UB_STATE_USED is set on completion of the start_dev; use it to detect
> and fail set_params commands which arrive too late to be applied (after
> start_dev).
> 
> [...]

Applied, thanks!

[1/1] ublk: set_params: properly check if parameters can be applied
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Best regards,
-- 
Jens Axboe