linux-kernel - [PATCH 01/10] blkcg: pass @q and @blkcg into blkcg_pol_alloc_pd

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Date:   Thu, 13 Jun 2019 18:56:11 -0700
From:   Tejun Heo <tj@...nel.org>
To:     axboe@...nel.dk, newella@...com, clm@...com, josef@...icpanda.com,
        dennisz@...com, lizefan@...wei.com, hannes@...xchg.org
Cc:     linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        kernel-team@...com, cgroups@...r.kernel.org, ast@...nel.org,
        daniel@...earbox.net, kafai@...com, songliubraving@...com,
        yhs@...com, bpf@...r.kernel.org, Tejun Heo <tj@...nel.org>
Subject: [PATCH 01/10] blkcg: pass @q and @blkcg into blkcg_pol_alloc_pd_fn()

Instead of @node, pass in @q and @blkcg so that the alloc function has
more context.  This doesn't cause any behavior change and will be used
by io.weight implementation.

Signed-off-by: Tejun Heo <tj@...nel.org>
---
 block/bfq-cgroup.c         | 5 +++--
 block/blk-cgroup.c         | 6 +++---
 block/blk-iolatency.c      | 6 ++++--
 block/blk-throttle.c       | 6 ++++--
 include/linux/blk-cgroup.h | 3 ++-
 5 files changed, 16 insertions(+), 10 deletions(-)

diff --git a/block/bfq-cgroup.c b/block/bfq-cgroup.c
index b3796a40a61a..4193172ad20f 100644
--- a/block/bfq-cgroup.c
+++ b/block/bfq-cgroup.c
@@ -425,11 +425,12 @@ static void bfq_cpd_free(struct blkcg_policy_data *cpd)
 	kfree(cpd_to_bfqgd(cpd));
 }
 
-static struct blkg_policy_data *bfq_pd_alloc(gfp_t gfp, int node)
+static struct blkg_policy_data *bfq_pd_alloc(gfp_t gfp, struct request_queue *q,
+					     struct blkcg *blkcg)
 {
 	struct bfq_group *bfqg;
 
-	bfqg = kzalloc_node(sizeof(*bfqg), gfp, node);
+	bfqg = kzalloc_node(sizeof(*bfqg), gfp, q->node);
 	if (!bfqg)
 		return NULL;
 
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 238d5d2d0691..30d3a0fbccac 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -174,7 +174,7 @@ static struct blkcg_gq *blkg_alloc(struct blkcg *blkcg, struct request_queue *q,
 			continue;
 
 		/* alloc per-policy data and attach it to blkg */
-		pd = pol->pd_alloc_fn(gfp_mask, q->node);
+		pd = pol->pd_alloc_fn(gfp_mask, q, blkcg);
 		if (!pd)
 			goto err_free;
 
@@ -1405,7 +1405,7 @@ int blkcg_activate_policy(struct request_queue *q,
 		blk_mq_freeze_queue(q);
 pd_prealloc:
 	if (!pd_prealloc) {
-		pd_prealloc = pol->pd_alloc_fn(GFP_KERNEL, q->node);
+		pd_prealloc = pol->pd_alloc_fn(GFP_KERNEL, q, &blkcg_root);
 		if (!pd_prealloc) {
 			ret = -ENOMEM;
 			goto out_bypass_end;
@@ -1421,7 +1421,7 @@ int blkcg_activate_policy(struct request_queue *q,
 		if (blkg->pd[pol->plid])
 			continue;
 
-		pd = pol->pd_alloc_fn(GFP_NOWAIT | __GFP_NOWARN, q->node);
+		pd = pol->pd_alloc_fn(GFP_NOWAIT | __GFP_NOWARN, q, &blkcg_root);
 		if (!pd)
 			swap(pd, pd_prealloc);
 		if (!pd) {
diff --git a/block/blk-iolatency.c b/block/blk-iolatency.c
index 17896bb3aaf2..fa47a6485725 100644
--- a/block/blk-iolatency.c
+++ b/block/blk-iolatency.c
@@ -950,11 +950,13 @@ static size_t iolatency_pd_stat(struct blkg_policy_data *pd, char *buf,
 }
 
 
-static struct blkg_policy_data *iolatency_pd_alloc(gfp_t gfp, int node)
+static struct blkg_policy_data *iolatency_pd_alloc(gfp_t gfp,
+						   struct request_queue *q,
+						   struct blkcg *blkcg)
 {
 	struct iolatency_grp *iolat;
 
-	iolat = kzalloc_node(sizeof(*iolat), gfp, node);
+	iolat = kzalloc_node(sizeof(*iolat), gfp, q->node);
 	if (!iolat)
 		return NULL;
 	iolat->stats = __alloc_percpu_gfp(sizeof(struct latency_stat),
diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 9ea7c0ecad10..3bb69a17c4b3 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -478,12 +478,14 @@ static void throtl_service_queue_init(struct throtl_service_queue *sq)
 	timer_setup(&sq->pending_timer, throtl_pending_timer_fn, 0);
 }
 
-static struct blkg_policy_data *throtl_pd_alloc(gfp_t gfp, int node)
+static struct blkg_policy_data *throtl_pd_alloc(gfp_t gfp,
+						struct request_queue *q,
+						struct blkcg *blkcg)
 {
 	struct throtl_grp *tg;
 	int rw;
 
-	tg = kzalloc_node(sizeof(*tg), gfp, node);
+	tg = kzalloc_node(sizeof(*tg), gfp, q->node);
 	if (!tg)
 		return NULL;
 
diff --git a/include/linux/blk-cgroup.h b/include/linux/blk-cgroup.h
index ffb2f88e87c6..1ed27977f88f 100644
--- a/include/linux/blk-cgroup.h
+++ b/include/linux/blk-cgroup.h
@@ -151,7 +151,8 @@ typedef struct blkcg_policy_data *(blkcg_pol_alloc_cpd_fn)(gfp_t gfp);
 typedef void (blkcg_pol_init_cpd_fn)(struct blkcg_policy_data *cpd);
 typedef void (blkcg_pol_free_cpd_fn)(struct blkcg_policy_data *cpd);
 typedef void (blkcg_pol_bind_cpd_fn)(struct blkcg_policy_data *cpd);
-typedef struct blkg_policy_data *(blkcg_pol_alloc_pd_fn)(gfp_t gfp, int node);
+typedef struct blkg_policy_data *(blkcg_pol_alloc_pd_fn)(gfp_t gfp,
+				struct request_queue *q, struct blkcg *blkcg);
 typedef void (blkcg_pol_init_pd_fn)(struct blkg_policy_data *pd);
 typedef void (blkcg_pol_online_pd_fn)(struct blkg_policy_data *pd);
 typedef void (blkcg_pol_offline_pd_fn)(struct blkg_policy_data *pd);
-- 
2.17.1