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[PATCH] block: document io scheduler allow_merge_fn hook
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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@ -946,6 +946,13 @@ elevator_merged_fn called when a request in the scheduler has been
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scheduler for example, to reposition the request
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if its sorting order has changed.
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elevator_allow_merge_fn called whenever the block layer determines
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that a bio can be merged into an existing
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request safely. The io scheduler may still
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want to stop a merge at this point if it
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results in some sort of conflict internally,
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this hook allows it to do that.
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elevator_dispatch_fn fills the dispatch queue with ready requests.
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I/O schedulers are free to postpone requests by
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not filling the dispatch queue unless @force
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