blkio: Export some symbols from blkio as its user CFQ can be a module

o blkio controller is inside the kernel and cfq makes use of interfaces
  exported by blkio. CFQ can be a module too, hence export symbols used
  by CFQ.

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

3 files changed, 27 insertions, 2 deletions

diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 73a5525cc0a2..4d4a277b2905 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -13,16 +13,33 @@
 #include <linux/ioprio.h>
 #include <linux/seq_file.h>
 #include <linux/kdev_t.h>
+#include <linux/module.h>
 #include "blk-cgroup.h"
 #include "cfq-iosched.h"
 
 struct blkio_cgroup blkio_root_cgroup = { .weight = 2*BLKIO_WEIGHT_DEFAULT };
+EXPORT_SYMBOL_GPL(blkio_root_cgroup);
+
+bool blkiocg_css_tryget(struct blkio_cgroup *blkcg)
+{
+        if (!css_tryget(&blkcg->css))
+                return false;
+        return true;
+}
+EXPORT_SYMBOL_GPL(blkiocg_css_tryget);
+
+void blkiocg_css_put(struct blkio_cgroup *blkcg)
+{
+        css_put(&blkcg->css);
+}
+EXPORT_SYMBOL_GPL(blkiocg_css_put);
 
 struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup)
 {
         return container_of(cgroup_subsys_state(cgroup, blkio_subsys_id),
                             struct blkio_cgroup, css);
 }
+EXPORT_SYMBOL_GPL(cgroup_to_blkio_cgroup);
 
 void blkiocg_update_blkio_group_stats(struct blkio_group *blkg,
                         unsigned long time, unsigned long sectors)
@@ -30,6 +47,7 @@ void blkiocg_update_blkio_group_stats(struct blkio_group *blkg,
         blkg->time += time;
         blkg->sectors += sectors;
 }
+EXPORT_SYMBOL_GPL(blkiocg_update_blkio_group_stats);
 
 void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg,
                         struct blkio_group *blkg, void *key, dev_t dev)
@@ -47,6 +65,7 @@ void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg,
 #endif
         blkg->dev = dev;
 }
+EXPORT_SYMBOL_GPL(blkiocg_add_blkio_group);
 
 static void __blkiocg_del_blkio_group(struct blkio_group *blkg)
 {
@@ -81,6 +100,7 @@ out:
         rcu_read_unlock();
         return ret;
 }
+EXPORT_SYMBOL_GPL(blkiocg_del_blkio_group);
 
 /* called under rcu_read_lock(). */
 struct blkio_group *blkiocg_lookup_group(struct blkio_cgroup *blkcg, void *key)
@@ -97,6 +117,7 @@ struct blkio_group *blkiocg_lookup_group(struct blkio_cgroup *blkcg, void *key)
 
         return NULL;
 }
+EXPORT_SYMBOL_GPL(blkiocg_lookup_group);
 
 #define SHOW_FUNCTION(__VAR)                                            \
 static u64 blkiocg_##__VAR##_read(struct cgroup *cgroup,                \
@@ -166,6 +187,7 @@ void blkiocg_update_blkio_group_dequeue_stats(struct blkio_group *blkg,
 {
         blkg->dequeue += dequeue;
 }
+EXPORT_SYMBOL_GPL(blkiocg_update_blkio_group_dequeue_stats);
 #endif
 
 struct cftype blkio_files[] = {
diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h
index 257dc6a956b6..4f89b967467f 100644
--- a/block/blk-cgroup.h
+++ b/block/blk-cgroup.h
@@ -43,6 +43,9 @@ struct blkio_group {
         unsigned long sectors;
 };
 
+extern bool blkiocg_css_tryget(struct blkio_cgroup *blkcg);
+extern void blkiocg_css_put(struct blkio_cgroup *blkcg);
+
 #else
 
 struct blkio_group {
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index b00ca4c86e25..7f3f343b0c65 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -961,7 +961,7 @@ cfq_find_alloc_cfqg(struct cfq_data *cfqd, struct cgroup *cgroup, int create)
         unsigned int major, minor;
 
         /* Do we need to take this reference */
-        if (!css_tryget(&blkcg->css))
+        if (!blkiocg_css_tryget(blkcg))
                 return NULL;;
 
         cfqg = cfqg_of_blkg(blkiocg_lookup_group(blkcg, key));
@@ -994,7 +994,7 @@ cfq_find_alloc_cfqg(struct cfq_data *cfqd, struct cgroup *cgroup, int create)
         hlist_add_head(&cfqg->cfqd_node, &cfqd->cfqg_list);
 
 done:
-        css_put(&blkcg->css);
+        blkiocg_css_put(blkcg);
         return cfqg;
 }