blkcg: pass around pd->pdata instead of pd itself in prfill functions

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>

4 files changed, 33 insertions, 41 deletions

diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index c0e239b8455e..7de19d7954c7 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 a77ab1ac53a7..c930895bfac9 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 004964bb6fdd..bd6dbfe1e4e9 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 adab10de6eea..fd505f721f61 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;
 }