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-rw-r--r--block/blk-cgroup.c51
1 files changed, 17 insertions, 34 deletions
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index aa54c4110f54..4fdeb46b4436 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -43,32 +43,12 @@ EXPORT_SYMBOL_GPL(blkio_root_cgroup);
static struct blkio_policy_type *blkio_policy[BLKIO_NR_POLICIES];
-static struct cgroup_subsys_state *blkiocg_create(struct cgroup_subsys *,
- struct cgroup *);
-static int blkiocg_can_attach(struct cgroup_subsys *, struct cgroup *,
- struct cgroup_taskset *);
-static int blkiocg_pre_destroy(struct cgroup_subsys *, struct cgroup *);
-static void blkiocg_destroy(struct cgroup_subsys *, struct cgroup *);
-static int blkiocg_populate(struct cgroup_subsys *, struct cgroup *);
-
/* for encoding cft->private value on file */
#define BLKIOFILE_PRIVATE(x, val) (((x) << 16) | (val))
/* What policy owns the file, proportional or throttle */
#define BLKIOFILE_POLICY(val) (((val) >> 16) & 0xffff)
#define BLKIOFILE_ATTR(val) ((val) & 0xffff)
-struct cgroup_subsys blkio_subsys = {
- .name = "blkio",
- .create = blkiocg_create,
- .can_attach = blkiocg_can_attach,
- .pre_destroy = blkiocg_pre_destroy,
- .destroy = blkiocg_destroy,
- .populate = blkiocg_populate,
- .subsys_id = blkio_subsys_id,
- .module = THIS_MODULE,
-};
-EXPORT_SYMBOL_GPL(blkio_subsys);
-
struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup)
{
return container_of(cgroup_subsys_state(cgroup, blkio_subsys_id),
@@ -1563,17 +1543,11 @@ struct cftype blkio_files[] = {
.read_map = blkiocg_file_read_map,
},
#endif
+ { } /* terminate */
};
-static int blkiocg_populate(struct cgroup_subsys *subsys, struct cgroup *cgroup)
-{
- return cgroup_add_files(cgroup, subsys, blkio_files,
- ARRAY_SIZE(blkio_files));
-}
-
/**
* blkiocg_pre_destroy - cgroup pre_destroy callback
- * @subsys: cgroup subsys
* @cgroup: cgroup of interest
*
* This function is called when @cgroup is about to go away and responsible
@@ -1583,8 +1557,7 @@ static int blkiocg_populate(struct cgroup_subsys *subsys, struct cgroup *cgroup)
*
* This is the blkcg counterpart of ioc_release_fn().
*/
-static int blkiocg_pre_destroy(struct cgroup_subsys *subsys,
- struct cgroup *cgroup)
+static int blkiocg_pre_destroy(struct cgroup *cgroup)
{
struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgroup);
@@ -1609,7 +1582,7 @@ static int blkiocg_pre_destroy(struct cgroup_subsys *subsys,
return 0;
}
-static void blkiocg_destroy(struct cgroup_subsys *subsys, struct cgroup *cgroup)
+static void blkiocg_destroy(struct cgroup *cgroup)
{
struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgroup);
@@ -1617,8 +1590,7 @@ static void blkiocg_destroy(struct cgroup_subsys *subsys, struct cgroup *cgroup)
kfree(blkcg);
}
-static struct cgroup_subsys_state *
-blkiocg_create(struct cgroup_subsys *subsys, struct cgroup *cgroup)
+static struct cgroup_subsys_state *blkiocg_create(struct cgroup *cgroup)
{
static atomic64_t id_seq = ATOMIC64_INIT(0);
struct blkio_cgroup *blkcg;
@@ -1706,8 +1678,7 @@ void blkcg_exit_queue(struct request_queue *q)
* of the main cic data structures. For now we allow a task to change
* its cgroup only if it's the only owner of its ioc.
*/
-static int blkiocg_can_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,
- struct cgroup_taskset *tset)
+static int blkiocg_can_attach(struct cgroup *cgrp, struct cgroup_taskset *tset)
{
struct task_struct *task;
struct io_context *ioc;
@@ -1750,6 +1721,18 @@ static void blkcg_bypass_end(void)
mutex_unlock(&all_q_mutex);
}
+struct cgroup_subsys blkio_subsys = {
+ .name = "blkio",
+ .create = blkiocg_create,
+ .can_attach = blkiocg_can_attach,
+ .pre_destroy = blkiocg_pre_destroy,
+ .destroy = blkiocg_destroy,
+ .subsys_id = blkio_subsys_id,
+ .base_cftypes = blkio_files,
+ .module = THIS_MODULE,
+};
+EXPORT_SYMBOL_GPL(blkio_subsys);
+
void blkio_policy_register(struct blkio_policy_type *blkiop)
{
struct request_queue *q;