diff options
Diffstat (limited to 'block/blk-cgroup.c')
| -rw-r--r-- | block/blk-cgroup.c | 27 |
1 files changed, 0 insertions, 27 deletions
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c index 582d2f18717e..d169e2055158 100644 --- a/block/blk-cgroup.c +++ b/block/blk-cgroup.c @@ -1217,32 +1217,6 @@ void blkcg_exit_queue(struct request_queue *q) blk_throtl_exit(q); } -/* - * We cannot support shared io contexts, as we have no mean to support - * two tasks with the same ioc in two different groups without major rework - * 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 blkcg_can_attach(struct cgroup_taskset *tset) -{ - struct task_struct *task; - struct cgroup_subsys_state *dst_css; - struct io_context *ioc; - int ret = 0; - - /* task_lock() is needed to avoid races with exit_io_context() */ - cgroup_taskset_for_each(task, dst_css, tset) { - task_lock(task); - ioc = task->io_context; - if (ioc && atomic_read(&ioc->nr_tasks) > 1) - ret = -EINVAL; - task_unlock(task); - if (ret) - break; - } - return ret; -} - static void blkcg_bind(struct cgroup_subsys_state *root_css) { int i; @@ -1275,7 +1249,6 @@ struct cgroup_subsys io_cgrp_subsys = { .css_online = blkcg_css_online, .css_offline = blkcg_css_offline, .css_free = blkcg_css_free, - .can_attach = blkcg_can_attach, .css_rstat_flush = blkcg_rstat_flush, .bind = blkcg_bind, .dfl_cftypes = blkcg_files, |