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Subject[PATCH -next 1/4] blk-iocost: track whether iocg is still online
Date
From: Yu Kuai <yukuai3@huawei.com>

blkcg_gq->online can't be used in iocost because it gets cleared only after
all policies are offlined. This patch add a new field 'online' in iocg.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
block/blk-iocost.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)

diff --git a/block/blk-iocost.c b/block/blk-iocost.c
index 3aeb8538f0c3..1498879c4a52 100644
--- a/block/blk-iocost.c
+++ b/block/blk-iocost.c
@@ -459,6 +459,8 @@ struct ioc_gq {
struct blkg_policy_data pd;
struct ioc *ioc;

+ bool online;
+
/*
* A iocg can get its weight from two sources - an explicit
* per-device-cgroup configuration or the default weight of the
@@ -2952,6 +2954,7 @@ static void ioc_pd_init(struct blkg_policy_data *pd)
ioc_now(ioc, &now);

iocg->ioc = ioc;
+ iocg->online = true;
atomic64_set(&iocg->vtime, now.vnow);
atomic64_set(&iocg->done_vtime, now.vnow);
atomic64_set(&iocg->active_period, atomic64_read(&ioc->cur_period));
@@ -2977,6 +2980,19 @@ static void ioc_pd_init(struct blkg_policy_data *pd)
spin_unlock_irqrestore(&ioc->lock, flags);
}

+static void ioc_pd_offline(struct blkg_policy_data *pd)
+{
+ struct ioc_gq *iocg = pd_to_iocg(pd);
+ struct ioc *ioc = iocg->ioc;
+ unsigned long flags;
+
+ if (ioc) {
+ spin_lock_irqsave(&ioc->lock, flags);
+ iocg->online = false;
+ spin_unlock_irqrestore(&ioc->lock, flags);
+ }
+}
+
static void ioc_pd_free(struct blkg_policy_data *pd)
{
struct ioc_gq *iocg = pd_to_iocg(pd);
@@ -3467,6 +3483,7 @@ static struct blkcg_policy blkcg_policy_iocost = {
.cpd_free_fn = ioc_cpd_free,
.pd_alloc_fn = ioc_pd_alloc,
.pd_init_fn = ioc_pd_init,
+ .pd_offline_fn = ioc_pd_offline,
.pd_free_fn = ioc_pd_free,
.pd_stat_fn = ioc_pd_stat,
};
--
2.31.1
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