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Subject[PATCH 20/21] blkcg: pass around pd->pdata instead of pd itself in prfill functions
Date
Now that all conf and stat fields are moved into policy specific
blkio_policy_data->pdata areas, there's no reason to use
blkio_policy_data itself in prfill functions. Pass around @pd->pdata
instead of @pd.

Signed-off-by: Tejun Heo <tj@kernel.org>
---
block/blk-cgroup.c | 33 +++++++++++++++------------------
block/blk-cgroup.h | 6 +++---
block/blk-throttle.c | 21 +++++++++------------
block/cfq-iosched.c | 14 ++++++--------
4 files changed, 33 insertions(+), 41 deletions(-)
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 7688aef..8f678d7 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -359,7 +359,7 @@ static const char *blkg_dev_name(struct blkio_group *blkg)
* cftype->read_seq_string method.
*/
void blkcg_print_blkgs(struct seq_file *sf, struct blkio_cgroup *blkcg,
- u64 (*prfill)(struct seq_file *, struct blkg_policy_data *, int),
+ u64 (*prfill)(struct seq_file *, void *, int),
int pol, int data, bool show_total)
{
struct blkio_group *blkg;
@@ -369,7 +369,7 @@ void blkcg_print_blkgs(struct seq_file *sf, struct blkio_cgroup *blkcg,
spin_lock_irq(&blkcg->lock);
hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node)
if (blkg->pd[pol])
- total += prfill(sf, blkg->pd[pol], data);
+ total += prfill(sf, blkg->pd[pol]->pdata, data);
spin_unlock_irq(&blkcg->lock);

if (show_total)
@@ -380,14 +380,14 @@ EXPORT_SYMBOL_GPL(blkcg_print_blkgs);
/**
* __blkg_prfill_u64 - prfill helper for a single u64 value
* @sf: seq_file to print to
- * @pd: policy data of interest
+ * @pdata: policy private data of interest
* @v: value to print
*
- * Print @v to @sf for the device assocaited with @pd.
+ * Print @v to @sf for the device assocaited with @pdata.
*/
-u64 __blkg_prfill_u64(struct seq_file *sf, struct blkg_policy_data *pd, u64 v)
+u64 __blkg_prfill_u64(struct seq_file *sf, void *pdata, u64 v)
{
- const char *dname = blkg_dev_name(pd->blkg);
+ const char *dname = blkg_dev_name(pdata_to_blkg(pdata));

if (!dname)
return 0;
@@ -400,12 +400,12 @@ EXPORT_SYMBOL_GPL(__blkg_prfill_u64);
/**
* __blkg_prfill_rwstat - prfill helper for a blkg_rwstat
* @sf: seq_file to print to
- * @pd: policy data of interest
+ * @pdata: policy private data of interest
* @rwstat: rwstat to print
*
- * Print @rwstat to @sf for the device assocaited with @pd.
+ * Print @rwstat to @sf for the device assocaited with @pdata.
*/
-u64 __blkg_prfill_rwstat(struct seq_file *sf, struct blkg_policy_data *pd,
+u64 __blkg_prfill_rwstat(struct seq_file *sf, void *pdata,
const struct blkg_rwstat *rwstat)
{
static const char *rwstr[] = {
@@ -414,7 +414,7 @@ u64 __blkg_prfill_rwstat(struct seq_file *sf, struct blkg_policy_data *pd,
[BLKG_RWSTAT_SYNC] = "Sync",
[BLKG_RWSTAT_ASYNC] = "Async",
};
- const char *dname = blkg_dev_name(pd->blkg);
+ const char *dname = blkg_dev_name(pdata_to_blkg(pdata));
u64 v;
int i;

@@ -430,19 +430,16 @@ u64 __blkg_prfill_rwstat(struct seq_file *sf, struct blkg_policy_data *pd,
return v;
}

-static u64 blkg_prfill_stat(struct seq_file *sf, struct blkg_policy_data *pd,
- int off)
+static u64 blkg_prfill_stat(struct seq_file *sf, void *pdata, int off)
{
- return __blkg_prfill_u64(sf, pd,
- blkg_stat_read((void *)pd->pdata + off));
+ return __blkg_prfill_u64(sf, pdata, blkg_stat_read(pdata + off));
}

-static u64 blkg_prfill_rwstat(struct seq_file *sf, struct blkg_policy_data *pd,
- int off)
+static u64 blkg_prfill_rwstat(struct seq_file *sf, void *pdata, int off)
{
- struct blkg_rwstat rwstat = blkg_rwstat_read((void *)pd->pdata + off);
+ struct blkg_rwstat rwstat = blkg_rwstat_read(pdata + off);

- return __blkg_prfill_rwstat(sf, pd, &rwstat);
+ return __blkg_prfill_rwstat(sf, pdata, &rwstat);
}

/* print blkg_stat specified by BLKCG_STAT_PRIV() */
diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h
index a77ab1a..c930895 100644
--- a/block/blk-cgroup.h
+++ b/block/blk-cgroup.h
@@ -126,10 +126,10 @@ extern void update_root_blkg_pd(struct request_queue *q,
enum blkio_policy_id plid);

void blkcg_print_blkgs(struct seq_file *sf, struct blkio_cgroup *blkcg,
- u64 (*prfill)(struct seq_file *, struct blkg_policy_data *, int),
+ u64 (*prfill)(struct seq_file *, void *, int),
int pol, int data, bool show_total);
-u64 __blkg_prfill_u64(struct seq_file *sf, struct blkg_policy_data *pd, u64 v);
-u64 __blkg_prfill_rwstat(struct seq_file *sf, struct blkg_policy_data *pd,
+u64 __blkg_prfill_u64(struct seq_file *sf, void *pdata, u64 v);
+u64 __blkg_prfill_rwstat(struct seq_file *sf, void *pdata,
const struct blkg_rwstat *rwstat);
int blkcg_print_stat(struct cgroup *cgrp, struct cftype *cft,
struct seq_file *sf);
diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 004964b..bd6dbfe 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -924,10 +924,9 @@ throtl_schedule_delayed_work(struct throtl_data *td, unsigned long delay)
}
}

-static u64 tg_prfill_cpu_rwstat(struct seq_file *sf,
- struct blkg_policy_data *pd, int off)
+static u64 tg_prfill_cpu_rwstat(struct seq_file *sf, void *pdata, int off)
{
- struct throtl_grp *tg = (void *)pd->pdata;
+ struct throtl_grp *tg = pdata;
struct blkg_rwstat rwstat = { }, tmp;
int i, cpu;

@@ -939,7 +938,7 @@ static u64 tg_prfill_cpu_rwstat(struct seq_file *sf,
rwstat.cnt[i] += tmp.cnt[i];
}

- return __blkg_prfill_rwstat(sf, pd, &rwstat);
+ return __blkg_prfill_rwstat(sf, pdata, &rwstat);
}

/* print per-cpu blkg_rwstat specified by BLKCG_STAT_PRIV() */
@@ -954,24 +953,22 @@ static int tg_print_cpu_rwstat(struct cgroup *cgrp, struct cftype *cft,
return 0;
}

-static u64 tg_prfill_conf_u64(struct seq_file *sf, struct blkg_policy_data *pd,
- int off)
+static u64 tg_prfill_conf_u64(struct seq_file *sf, void *pdata, int off)
{
- u64 v = *(u64 *)((void *)pd->pdata + off);
+ u64 v = *(u64 *)(pdata + off);

if (v == -1)
return 0;
- return __blkg_prfill_u64(sf, pd, v);
+ return __blkg_prfill_u64(sf, pdata, v);
}

-static u64 tg_prfill_conf_uint(struct seq_file *sf, struct blkg_policy_data *pd,
- int off)
+static u64 tg_prfill_conf_uint(struct seq_file *sf, void *pdata, int off)
{
- unsigned int v = *(unsigned int *)((void *)pd->pdata + off);
+ unsigned int v = *(unsigned int *)(pdata + off);

if (v == -1)
return 0;
- return __blkg_prfill_u64(sf, pd, v);
+ return __blkg_prfill_u64(sf, pdata, v);
}

static int tg_print_conf_u64(struct cgroup *cgrp, struct cftype *cft,
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index adab10d..fd505f7 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -1368,14 +1368,13 @@ static void cfq_link_cfqq_cfqg(struct cfq_queue *cfqq, struct cfq_group *cfqg)
cfqg_get(cfqg);
}

-static u64 cfqg_prfill_weight_device(struct seq_file *sf,
- struct blkg_policy_data *pd, int off)
+static u64 cfqg_prfill_weight_device(struct seq_file *sf, void *pdata, int off)
{
- struct cfq_group *cfqg = (void *)pd->pdata;
+ struct cfq_group *cfqg = pdata;

if (!cfqg->dev_weight)
return 0;
- return __blkg_prfill_u64(sf, pd, cfqg->dev_weight);
+ return __blkg_prfill_u64(sf, pdata, cfqg->dev_weight);
}

static int cfqg_print_weight_device(struct cgroup *cgrp, struct cftype *cft,
@@ -1443,10 +1442,9 @@ static int cfq_set_weight(struct cgroup *cgrp, struct cftype *cft, u64 val)
}

#ifdef CONFIG_DEBUG_BLK_CGROUP
-static u64 cfqg_prfill_avg_queue_size(struct seq_file *sf,
- struct blkg_policy_data *pd, int off)
+static u64 cfqg_prfill_avg_queue_size(struct seq_file *sf, void *pdata, int off)
{
- struct cfq_group *cfqg = (void *)pd->pdata;
+ struct cfq_group *cfqg = pdata;
u64 samples = blkg_stat_read(&cfqg->stats.avg_queue_size_samples);
u64 v = 0;

@@ -1454,7 +1452,7 @@ static u64 cfqg_prfill_avg_queue_size(struct seq_file *sf,
v = blkg_stat_read(&cfqg->stats.avg_queue_size_sum);
do_div(v, samples);
}
- __blkg_prfill_u64(sf, pd, v);
+ __blkg_prfill_u64(sf, pdata, v);
return 0;
}

--
1.7.7.3


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