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bfq: Extract bfq_group_set_weight from bfq_io_set_weight_legacy

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This function will be useful when we update weight from the soon-coming
per-device interface.

Signed-off-by: Fam Zheng <zhengfeiran@bytedance.com>
Reviewed-by: Paolo Valente <paolo.valente@linaro.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Fam Zheng 2019-08-28 11:54:52 +08:00 committed by Jens Axboe
parent e9d3c866bf
commit 5ff047e328
1 changed files with 32 additions and 28 deletions
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46
block/bfq-cgroup.c
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@ -919,34 +919,16 @@ static int bfq_io_show_weight(struct seq_file *sf, void *v)
return 0;
}
static int bfq_io_set_weight_legacy(struct cgroup_subsys_state *css,
struct cftype *cftype,
u64 val)
static void bfq_group_set_weight(struct bfq_group *bfqg, u64 weight)
{
struct blkcg *blkcg = css_to_blkcg(css);
struct bfq_group_data *bfqgd = blkcg_to_bfqgd(blkcg);
struct blkcg_gq *blkg;
int ret = -ERANGE;
if (val < BFQ_MIN_WEIGHT || val > BFQ_MAX_WEIGHT)
return ret;
ret = 0;
spin_lock_irq(&blkcg->lock);
bfqgd->weight = (unsigned short)val;
hlist_for_each_entry(blkg, &blkcg->blkg_list, blkcg_node) {
struct bfq_group *bfqg = blkg_to_bfqg(blkg);
if (!bfqg)
continue;
/*
* Setting the prio_changed flag of the entity
* to 1 with new_weight == weight would re-set
* the value of the weight to its ioprio mapping.
* Set the flag only if necessary.
*/
if ((unsigned short)val != bfqg->entity.new_weight) {
bfqg->entity.new_weight = (unsigned short)val;
if ((unsigned short)weight != bfqg->entity.new_weight) {
bfqg->entity.new_weight = (unsigned short)weight;
/*
* Make sure that the above new value has been
* stored in bfqg->entity.new_weight before
@ -965,6 +947,28 @@ static int bfq_io_set_weight_legacy(struct cgroup_subsys_state *css,
smp_wmb();
bfqg->entity.prio_changed = 1;
}
}
static int bfq_io_set_weight_legacy(struct cgroup_subsys_state *css,
struct cftype *cftype,
u64 val)
{
struct blkcg *blkcg = css_to_blkcg(css);
struct bfq_group_data *bfqgd = blkcg_to_bfqgd(blkcg);
struct blkcg_gq *blkg;
int ret = -ERANGE;
if (val < BFQ_MIN_WEIGHT || val > BFQ_MAX_WEIGHT)
return ret;
ret = 0;
spin_lock_irq(&blkcg->lock);
bfqgd->weight = (unsigned short)val;
hlist_for_each_entry(blkg, &blkcg->blkg_list, blkcg_node) {
struct bfq_group *bfqg = blkg_to_bfqg(blkg);
if (bfqg)
bfq_group_set_weight(bfqg, val);
}
spin_unlock_irq(&blkcg->lock);