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(parent: a63a5cf) | patch
block: fix request sorting at unplug
authorKonstantin Khlebnikov <khlebnikov@openvz.org>
Sun, 3 Apr 2011 22:15:02 +0000 (00:15 +0200)
committerJens Axboe <jaxboe@fusionio.com>
Tue, 5 Apr 2011 21:52:49 +0000 (23:52 +0200)
commitf83e826181f7f8fb152e4190d03854fc3a5dd040
tree989f440665d529587fcc6365b1968e2b29fb7c94tree | snapshot (tar.gz zip)
parenta63a5cf84dac7a23a57c800eea5734701e7d3c04commit | diff
block: fix request sorting at unplug

Comparison function for list_sort() must be anticommutative,
otherwise it is not sorting in ordinary meaning.

But fortunately list_sort() always check ((*cmp)(priv, a, b) <= 0)
it not distinguish negative and zero, so comparison function can
implement only less-or-equal instead of full three-way comparison.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
block/blk-core.c diff | blob | blame | history