block: simplify elevator reattachment for updating nr_hw_queues

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In blk_mq_update_nr_hw_queues(), nr_hw_queues changes and elevator data
depends on it, and elevator has to be reattached, so call elevator_switch()
to force attachment.

Add elv_update_nr_hw_queues() simply for blk_mq_update_nr_hw_queues() to
reattach elevator, since elevator switch isn't likely when running
blk_mq_update_nr_hw_queues(). This way removes the current switch
none and switch back code.

Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Nilay Shroff <nilay@linux.ibm.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20250505141805.2751237-14-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

...

This commit is contained in:

Ming Lei 2025-05-05 22:17:51 +08:00 • committed by Jens Axboe

parent ac55b71a31

commit 596dce110b

3 changed files with 21 additions and 92 deletions

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90

block/blk-mq.c

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3

block/blk.h

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20

block/elevator.c

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