block: remove ioc_*_changed()

After the previous patch to cfq, there's no ioc_get_changed() user
left.  This patch yanks out ioc_{ioprio|cgroup|get}_changed() and all
related stuff.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 0 insertions, 19 deletions

diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 30e07308db24..a74019b67311 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -47,8 +47,6 @@ 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 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 *);
@@ -63,7 +61,6 @@ struct cgroup_subsys blkio_subsys = {
         .name = "blkio",
         .create = blkiocg_create,
         .can_attach = blkiocg_can_attach,
-        .attach = blkiocg_attach,
         .pre_destroy = blkiocg_pre_destroy,
         .destroy = blkiocg_destroy,
         .populate = blkiocg_populate,
@@ -1729,22 +1726,6 @@ 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)
-{
-        struct task_struct *task;
-        struct io_context *ioc;
-
-        cgroup_taskset_for_each(task, cgrp, tset) {
-                /* 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);
-                }
-        }
-}
-
 static void blkcg_bypass_start(void)
         __acquires(&all_q_mutex)
 {