Commit 126ec9a6 authored by Jens Axboe's avatar Jens Axboe

[PATCH] block: document io scheduler allow_merge_fn hook

Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
parent da775265
......@@ -946,6 +946,13 @@ elevator_merged_fn called when a request in the scheduler has been
scheduler for example, to reposition the request
if its sorting order has changed.
elevator_allow_merge_fn called whenever the block layer determines
that a bio can be merged into an existing
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.
elevator_dispatch_fn fills the dispatch queue with ready requests.
I/O schedulers are free to postpone requests by
not filling the dispatch queue unless @force
......
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