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cfq-iosched: Fix update_vdisktime logic

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The update_vdisktime logic is broken since commit
b54ce60eb7f61f8e314b8b241b0469eda3bb1d42, st->min_vdisktime never makes
a progress. Fix it.

Thanks Vivek for pointing it out.

Signed-off-by: Gui Jianfeng <guijianfen@cn.fujitsu.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
This commit is contained in:
Gui Jianfeng 2011-03-07 09:28:09 +01:00 committed by Jens Axboe
parent ef8a41df8c
commit a60327107b
1 changed files with 2 additions and 4 deletions
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6
block/cfq-iosched.c
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@ -557,15 +557,13 @@ static inline u64 min_vdisktime(u64 min_vdisktime, u64 vdisktime)
static void update_min_vdisktime(struct cfq_rb_root *st)
{
u64 vdisktime = st->min_vdisktime;
struct cfq_group *cfqg;
if (st->left) {
cfqg = rb_entry_cfqg(st->left);
vdisktime = min_vdisktime(vdisktime, cfqg->vdisktime);
st->min_vdisktime = max_vdisktime(st->min_vdisktime,
cfqg->vdisktime);
}
st->min_vdisktime = max_vdisktime(st->min_vdisktime, vdisktime);
}
/*