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blk-cgroup: move struct blkcg to block/blk-cgroup.h

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There is no real need to expose the blkcg structure to the whole kernel.
Move it to the private header an expose a helper to let the writeback
code access the cgwb_list member.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220420042723.1010598-8-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig
2022-04-20 06:27:15 +02:00
committed by Jens Axboe
parent 397c9f46ee
commit dec223c92a
5 changed files with 45 additions and 43 deletions
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13
mm/backing-dev.c
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@@ -445,7 +445,6 @@ static int cgwb_create(struct backing_dev_info *bdi,
{
struct mem_cgroup *memcg;
struct cgroup_subsys_state *blkcg_css;
struct blkcg *blkcg;
struct list_head *memcg_cgwb_list, *blkcg_cgwb_list;
struct bdi_writeback *wb;
unsigned long flags;
@@ -453,9 +452,8 @@ static int cgwb_create(struct backing_dev_info *bdi,
memcg = mem_cgroup_from_css(memcg_css);
blkcg_css = cgroup_get_e_css(memcg_css->cgroup, &io_cgrp_subsys);
blkcg = css_to_blkcg(blkcg_css);
memcg_cgwb_list = &memcg->cgwb_list;
blkcg_cgwb_list = &blkcg->cgwb_list;
blkcg_cgwb_list = blkcg_get_cgwb_list(blkcg_css);
/* look up again under lock and discard on blkcg mismatch */
spin_lock_irqsave(&cgwb_lock, flags);
@@ -723,18 +721,19 @@ void wb_memcg_offline(struct mem_cgroup *memcg)
/**
* wb_blkcg_offline - kill all wb's associated with a blkcg being offlined
* @blkcg: blkcg being offlined
* @css: blkcg being offlined
*
* Also prevents creation of any new wb's associated with @blkcg.
*/
void wb_blkcg_offline(struct blkcg *blkcg)
void wb_blkcg_offline(struct cgroup_subsys_state *css)
{
struct bdi_writeback *wb, *next;
struct list_head *list = blkcg_get_cgwb_list(css);
spin_lock_irq(&cgwb_lock);
list_for_each_entry_safe(wb, next, &blkcg->cgwb_list, blkcg_node)
list_for_each_entry_safe(wb, next, list, blkcg_node)
cgwb_kill(wb);
blkcg->cgwb_list.next = NULL; /* prevent new wb's */
list->next = NULL; /* prevent new wb's */
spin_unlock_irq(&cgwb_lock);
}