blkio: Propagate cgroup weight updation to cfq groups
o Propagate blkio cgroup weight updation to associated cfq groups.
Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 4ef78d3..179ddfa 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -16,6 +16,7 @@
#include "blk-cgroup.h"
extern void cfq_unlink_blkio_group(void *, struct blkio_group *);
+extern void cfq_update_blkio_group_weight(struct blkio_group *, unsigned int);
struct blkio_cgroup blkio_root_cgroup = { .weight = 2*BLKIO_WEIGHT_DEFAULT };
@@ -116,12 +117,18 @@
blkiocg_weight_write(struct cgroup *cgroup, struct cftype *cftype, u64 val)
{
struct blkio_cgroup *blkcg;
+ struct blkio_group *blkg;
+ struct hlist_node *n;
if (val < BLKIO_WEIGHT_MIN || val > BLKIO_WEIGHT_MAX)
return -EINVAL;
blkcg = cgroup_to_blkio_cgroup(cgroup);
+ spin_lock_irq(&blkcg->lock);
blkcg->weight = (unsigned int)val;
+ hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node)
+ cfq_update_blkio_group_weight(blkg, blkcg->weight);
+ spin_unlock_irq(&blkcg->lock);
return 0;
}