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[PATCH] block: document io scheduler allow_merge_fn hook 

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jens Axboe 2006-12-20 11:06:15 +01:00
parent da77526502
commit 126ec9a676
1 changed files with 7 additions and 0 deletions
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7
Documentation/block/biodoc.txt
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@ -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