Mark mandatory elevator functions in the biodoc.txt
biodoc.txt mentions that elevator functions marked with * are mandatory, but no function is marked with *. Mark the 3 functions which should be implemented by any io scheduler. Signed-off-by: Nikanth Karthikesan <knikanth@suse.de> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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@ -954,14 +954,14 @@ elevator_allow_merge_fn called whenever the block layer determines
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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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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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is non-zero. Once dispatched, I/O schedulers
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are not allowed to manipulate the requests -
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they belong to generic dispatch queue.
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elevator_add_req_fn called to add a new request into the scheduler
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elevator_add_req_fn* called to add a new request into the scheduler
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elevator_queue_empty_fn returns true if the merge queue is empty.
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Drivers shouldn't use this, but rather check
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@ -991,7 +991,7 @@ elevator_activate_req_fn Called when device driver first sees a request.
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elevator_deactivate_req_fn Called when device driver decides to delay
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a request by requeueing it.
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elevator_init_fn
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elevator_init_fn*
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elevator_exit_fn Allocate and free any elevator specific storage
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for a queue.
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