cgroup: remove cgroup_subsys argument from callbacks

[platform/adaptation/renesas_rcar/renesas_kernel.git] / block / blk-cgroup.c

diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index b8c143d..1359d63 100644 (file)
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -28,13 +28,10 @@ static LIST_HEAD(blkio_list);
 struct blkio_cgroup blkio_root_cgroup = { .weight = 2*BLKIO_WEIGHT_DEFAULT };
 EXPORT_SYMBOL_GPL(blkio_root_cgroup);
 
-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 void blkiocg_attach(struct cgroup_subsys *, struct cgroup *,
-                          struct cgroup_taskset *);
-static void blkiocg_destroy(struct cgroup_subsys *, struct cgroup *);
+static struct cgroup_subsys_state *blkiocg_create(struct cgroup *);
+static int blkiocg_can_attach(struct cgroup *, struct cgroup_taskset *);
+static void blkiocg_attach(struct cgroup *, struct cgroup_taskset *);
+static void blkiocg_destroy(struct cgroup *);
 static int blkiocg_populate(struct cgroup_subsys *, struct cgroup *);
 
 /* for encoding cft->private value on file */
@@ -1548,7 +1545,7 @@ static int blkiocg_populate(struct cgroup_subsys *subsys, struct cgroup *cgroup)
                                ARRAY_SIZE(blkio_files));
 }
 
-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);
        unsigned long flags;
@@ -1598,8 +1595,7 @@ 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)
 {
        struct blkio_cgroup *blkcg;
        struct cgroup *parent = cgroup->parent;
@@ -1628,8 +1624,7 @@ done:
  * 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;
@@ -1648,18 +1643,18 @@ static int blkiocg_can_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,
        return ret;
 }
 
-static void blkiocg_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,
-                          struct cgroup_taskset *tset)
+static void blkiocg_attach(struct cgroup *cgrp, struct cgroup_taskset *tset)
 {
        struct task_struct *task;
        struct io_context *ioc;
 
        cgroup_taskset_for_each(task, cgrp, tset) {
-               task_lock(task);
-               ioc = task->io_context;
-               if (ioc)
-                       ioc->cgroup_changed = 1;
-               task_unlock(task);
+               /* we don't lose anything even if ioc allocation fails */
+               ioc = get_task_io_context(task, GFP_ATOMIC, NUMA_NO_NODE);
+               if (ioc) {
+                       ioc_cgroup_changed(ioc);
+                       put_io_context(ioc, NULL);
+               }
        }
 }