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-rw-r--r--block/blk-cgroup.c21
-rw-r--r--block/blk-throttle.c13
-rw-r--r--block/cfq-iosched.c13
-rw-r--r--include/linux/blk-cgroup.h18
4 files changed, 44 insertions, 21 deletions
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 4defbbabc0ff..d1bc6099bd1e 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -68,7 +68,8 @@ static void blkg_free(struct blkcg_gq *blkg)
return;
for (i = 0; i < BLKCG_MAX_POLS; i++)
- kfree(blkg->pd[i]);
+ if (blkg->pd[i])
+ blkcg_policy[i]->pd_free_fn(blkg->pd[i]);
if (blkg->blkcg != &blkcg_root)
blk_exit_rl(&blkg->rl);
@@ -114,7 +115,7 @@ static struct blkcg_gq *blkg_alloc(struct blkcg *blkcg, struct request_queue *q,
continue;
/* alloc per-policy data and attach it to blkg */
- pd = kzalloc_node(pol->pd_size, gfp_mask, q->node);
+ pd = pol->pd_alloc_fn(gfp_mask, q->node);
if (!pd)
goto err_free;
@@ -1057,7 +1058,7 @@ int blkcg_activate_policy(struct request_queue *q,
blk_queue_bypass_start(q);
pd_prealloc:
if (!pd_prealloc) {
- pd_prealloc = kzalloc_node(pol->pd_size, GFP_KERNEL, q->node);
+ pd_prealloc = pol->pd_alloc_fn(GFP_KERNEL, q->node);
if (!pd_prealloc) {
ret = -ENOMEM;
goto out_bypass_end;
@@ -1072,7 +1073,7 @@ pd_prealloc:
if (blkg->pd[pol->plid])
continue;
- pd = kzalloc_node(pol->pd_size, GFP_NOWAIT, q->node);
+ pd = pol->pd_alloc_fn(GFP_NOWAIT, q->node);
if (!pd)
swap(pd, pd_prealloc);
if (!pd) {
@@ -1093,7 +1094,8 @@ pd_prealloc:
spin_unlock_irq(q->queue_lock);
out_bypass_end:
blk_queue_bypass_end(q);
- kfree(pd_prealloc);
+ if (pd_prealloc)
+ pol->pd_free_fn(pd_prealloc);
return ret;
}
EXPORT_SYMBOL_GPL(blkcg_activate_policy);
@@ -1128,8 +1130,10 @@ void blkcg_deactivate_policy(struct request_queue *q,
if (pol->pd_exit_fn)
pol->pd_exit_fn(blkg);
- kfree(blkg->pd[pol->plid]);
- blkg->pd[pol->plid] = NULL;
+ if (blkg->pd[pol->plid]) {
+ pol->pd_free_fn(blkg->pd[pol->plid]);
+ blkg->pd[pol->plid] = NULL;
+ }
spin_unlock(&blkg->blkcg->lock);
}
@@ -1151,9 +1155,6 @@ int blkcg_policy_register(struct blkcg_policy *pol)
struct blkcg *blkcg;
int i, ret;
- if (WARN_ON(pol->pd_size < sizeof(struct blkg_policy_data)))
- return -EINVAL;
-
mutex_lock(&blkcg_pol_register_mutex);
mutex_lock(&blkcg_pol_mutex);
diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index b23193518ac7..f1dd691c5359 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -403,6 +403,11 @@ static void throtl_service_queue_exit(struct throtl_service_queue *sq)
del_timer_sync(&sq->pending_timer);
}
+static struct blkg_policy_data *throtl_pd_alloc(gfp_t gfp, int node)
+{
+ return kzalloc_node(sizeof(struct throtl_grp), gfp, node);
+}
+
static void throtl_pd_init(struct blkcg_gq *blkg)
{
struct throtl_grp *tg = blkg_to_tg(blkg);
@@ -493,6 +498,11 @@ static void throtl_pd_exit(struct blkcg_gq *blkg)
throtl_service_queue_exit(&tg->service_queue);
}
+static void throtl_pd_free(struct blkg_policy_data *pd)
+{
+ kfree(pd);
+}
+
static void throtl_pd_reset_stats(struct blkcg_gq *blkg)
{
struct throtl_grp *tg = blkg_to_tg(blkg);
@@ -1468,12 +1478,13 @@ static void throtl_shutdown_wq(struct request_queue *q)
}
static struct blkcg_policy blkcg_policy_throtl = {
- .pd_size = sizeof(struct throtl_grp),
.cftypes = throtl_files,
+ .pd_alloc_fn = throtl_pd_alloc,
.pd_init_fn = throtl_pd_init,
.pd_online_fn = throtl_pd_online,
.pd_exit_fn = throtl_pd_exit,
+ .pd_free_fn = throtl_pd_free,
.pd_reset_stats_fn = throtl_pd_reset_stats,
};
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 9c9ec7cc9f99..69ce2883099e 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -1582,6 +1582,11 @@ static void cfq_cpd_init(const struct blkcg *blkcg)
}
}
+static struct blkg_policy_data *cfq_pd_alloc(gfp_t gfp, int node)
+{
+ return kzalloc_node(sizeof(struct cfq_group), gfp, node);
+}
+
static void cfq_pd_init(struct blkcg_gq *blkg)
{
struct cfq_group *cfqg = blkg_to_cfqg(blkg);
@@ -1618,6 +1623,11 @@ static void cfq_pd_offline(struct blkcg_gq *blkg)
cfqg_stats_xfer_dead(cfqg);
}
+static void cfq_pd_free(struct blkg_policy_data *pd)
+{
+ return kfree(pd);
+}
+
/* offset delta from cfqg->stats to cfqg->dead_stats */
static const int dead_stats_off_delta = offsetof(struct cfq_group, dead_stats) -
offsetof(struct cfq_group, stats);
@@ -4633,13 +4643,14 @@ static struct elevator_type iosched_cfq = {
#ifdef CONFIG_CFQ_GROUP_IOSCHED
static struct blkcg_policy blkcg_policy_cfq = {
- .pd_size = sizeof(struct cfq_group),
.cpd_size = sizeof(struct cfq_group_data),
.cftypes = cfq_blkcg_files,
.cpd_init_fn = cfq_cpd_init,
+ .pd_alloc_fn = cfq_pd_alloc,
.pd_init_fn = cfq_pd_init,
.pd_offline_fn = cfq_pd_offline,
+ .pd_free_fn = cfq_pd_free,
.pd_reset_stats_fn = cfq_pd_reset_stats,
};
#endif
diff --git a/include/linux/blk-cgroup.h b/include/linux/blk-cgroup.h
index db822880242a..bd173ea360ce 100644
--- a/include/linux/blk-cgroup.h
+++ b/include/linux/blk-cgroup.h
@@ -68,13 +68,11 @@ struct blkg_rwstat {
* request_queue (q). This is used by blkcg policies which need to track
* information per blkcg - q pair.
*
- * There can be multiple active blkcg policies and each has its private
- * data on each blkg, the size of which is determined by
- * blkcg_policy->pd_size. blkcg core allocates and frees such areas
- * together with blkg and invokes pd_init/exit_fn() methods.
- *
- * Such private data must embed struct blkg_policy_data (pd) at the
- * beginning and pd_size can't be smaller than pd.
+ * There can be multiple active blkcg policies and each blkg:policy pair is
+ * represented by a blkg_policy_data which is allocated and freed by each
+ * policy's pd_alloc/free_fn() methods. A policy can allocate private data
+ * area by allocating larger data structure which embeds blkg_policy_data
+ * at the beginning.
*/
struct blkg_policy_data {
/* the blkg and policy id this per-policy data belongs to */
@@ -126,16 +124,16 @@ struct blkcg_gq {
};
typedef void (blkcg_pol_init_cpd_fn)(const struct blkcg *blkcg);
+typedef struct blkg_policy_data *(blkcg_pol_alloc_pd_fn)(gfp_t gfp, int node);
typedef void (blkcg_pol_init_pd_fn)(struct blkcg_gq *blkg);
typedef void (blkcg_pol_online_pd_fn)(struct blkcg_gq *blkg);
typedef void (blkcg_pol_offline_pd_fn)(struct blkcg_gq *blkg);
typedef void (blkcg_pol_exit_pd_fn)(struct blkcg_gq *blkg);
+typedef void (blkcg_pol_free_pd_fn)(struct blkg_policy_data *pd);
typedef void (blkcg_pol_reset_pd_stats_fn)(struct blkcg_gq *blkg);
struct blkcg_policy {
int plid;
- /* policy specific private data size */
- size_t pd_size;
/* policy specific per-blkcg data size */
size_t cpd_size;
/* cgroup files for the policy */
@@ -143,10 +141,12 @@ struct blkcg_policy {
/* operations */
blkcg_pol_init_cpd_fn *cpd_init_fn;
+ blkcg_pol_alloc_pd_fn *pd_alloc_fn;
blkcg_pol_init_pd_fn *pd_init_fn;
blkcg_pol_online_pd_fn *pd_online_fn;
blkcg_pol_offline_pd_fn *pd_offline_fn;
blkcg_pol_exit_pd_fn *pd_exit_fn;
+ blkcg_pol_free_pd_fn *pd_free_fn;
blkcg_pol_reset_pd_stats_fn *pd_reset_stats_fn;
};
generated by cgit v1.2.3 (git 2.0.4) at 2024-06-27 06:44:14 +0000