block: Expand a bit documentation about elevator_allow_merge_fn
authorJan Kara <jack@suse.cz>
Tue, 4 Nov 2014 11:52:41 +0000 (12:52 +0100)
committerJens Axboe <axboe@fb.com>
Tue, 4 Nov 2014 15:28:15 +0000 (08:28 -0700)
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>

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