Jan Kara b8ab956c54 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: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@fb.com>
2014-11-04 08:28:15 -07:00
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