diff options
| author | Christoph Hellwig <hch@lst.de> | 2022-04-20 06:27:15 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2022-05-02 14:06:20 -0600 |
| commit | dec223c92a4688f6c9642d640cfe15a99d289dd4 (patch) | |
| tree | ee13aaf118cd8a274d477a144fb9aed2ed33a8df /mm/backing-dev.c | |
| parent | 397c9f46ee4d99024c64954b007c1b5762d01cb4 (diff) | |
| download | lwn-dec223c92a4688f6c9642d640cfe15a99d289dd4.tar.gz lwn-dec223c92a4688f6c9642d640cfe15a99d289dd4.zip | |
blk-cgroup: move struct blkcg to block/blk-cgroup.h
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>
Diffstat (limited to 'mm/backing-dev.c')
| -rw-r--r-- | mm/backing-dev.c | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/mm/backing-dev.c b/mm/backing-dev.c index 93cddbcd4eb8..98f8f62e52ca 100644 --- a/mm/backing-dev.c +++ b/mm/backing-dev.c @@ -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); } |