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block: move ELEVATOR_FLAG_DISABLE_WBT a request queue flag

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ELEVATOR_FLAG_DISABLE_WBT is only used by BFQ to disallow wbt when BFQ is
in use. The flag is set in BFQ's init(), and cleared in BFQ's exit().

Making it as request queue flag, so that we can avoid to deal with elevator
switch race. Also it isn't graceful to checking one scheduler flag in
wbt_enable_default().

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Nilay Shroff <nilay@linux.ibm.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20250505141805.2751237-3-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ming Lei
2025-05-05 22:17:40 +08:00
committed by Jens Axboe
parent f24d47edd1
commit 56dee46ff4
5 changed files with 7 additions and 5 deletions
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1
block/elevator.h
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@@ -121,7 +121,6 @@ struct elevator_queue
};
#define ELEVATOR_FLAG_REGISTERED 0
#define ELEVATOR_FLAG_DISABLE_WBT 1
/*
* block elevator interface