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Commit b8ab956c authored by Jan Kara's avatar Jan Kara Committed by Jens Axboe
Browse files

block: Expand a bit documentation about elevator_allow_merge_fn 



Explain that two requests can be merged without
elevator_allow_merge_fn() being called.

Signed-off-by: default avatarJan Kara <jack@suse.cz>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent e167dfb5

Documentation/block/biodoc.txt

+5 −1
Original line number Diff line number Diff line
@@ -946,7 +946,11 @@ elevator_allow_merge_fn called whenever the block layer determines 
				request safely. The io scheduler may still

				want to stop a merge at this point if it

				results in some sort of conflict internally,

				this hook allows it to do that.

				this hook allows it to do that. Note however

				that two *requests* can still be merged at later

				time. Currently the io scheduler has no way to

				prevent that. It can only learn about the fact

				from elevator_merge_req_fn callback.



elevator_dispatch_fn*		fills the dispatch queue with ready requests.

				I/O schedulers are free to postpone requests by