On 11/15/2016 05:01 PM, Mike Snitzer wrote:
On Tue, Nov 15 2016 at 7:40pm -0500,
Bart Van Assche <bart.vanassche@xxxxxxxxxxx> wrote:
Are you aware that dm_table_determine_type() sets "all_blk_mq" to
false if there are no paths, even if the dm device is in blk-mq
mode?
That shouldn't matter. Once the type is established, it is used to
initialize the DM device's request_queue, the type cannot change across
different table loads.
For a single queue dm device, what prevents a user from removing all
single queue paths and to add one or more blk-mq paths? I think this
will cause dm_table_determine_type() to change the table type.
Bart.
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