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SubjectRe: [PATCH 17/19] io-controller: Support per cgroup per device weights and io class
Vivek Goyal wrote:
...
>
> @@ -1233,6 +1254,8 @@ struct io_group *io_group_chain_alloc(struct request_queue *q, void *key,
> elv_get_iog(iog);
>
> iog->iocg_id = css_id(&iocg->css);
> + io_group_init_entity(iocg, iog, iog->dev);

Hi Vivek,

A regression occurs in io.policy handling. IO Controller completely stops working when i use
this interface.
Make sure that we initialize entity after iog->dev is setting up properly.

Signed-off-by: Gui Jianfeng <guijianfeng@cn.fujitsu.com>
---
block/elevator-fq.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/block/elevator-fq.c b/block/elevator-fq.c
index 6b30c36..a516dce 100644
--- a/block/elevator-fq.c
+++ b/block/elevator-fq.c
@@ -1451,7 +1451,6 @@ struct io_group *io_group_chain_alloc(struct request_queue *q, void *key,
elv_get_iog(iog);

iog->iocg_id = css_id(&iocg->css);
- io_group_init_entity(iocg, iog, iog->dev);
iog->my_entity = &iog->entity;

if (bio) {
@@ -1459,6 +1458,8 @@ struct io_group *io_group_chain_alloc(struct request_queue *q, void *key,
iog->dev = MKDEV(disk->major, disk->first_minor);
}

+ io_group_init_entity(iocg, iog, iog->dev);
+
blk_init_request_list(&iog->rl);
#ifdef CONFIG_DEBUG_GROUP_IOSCHED
io_group_path(iog, iog->path, sizeof(iog->path));
--
1.5.4.rc3


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