[PATCH 08/13] bdi: Shutdown writeback on all cgwbs in cgwb_bdi_destroy()
From: Jan Kara <jack@suse.cz>
Date: 2017-02-21 17:09:53
Subsystem:
memory management, memory management - misc, the rest · Maintainers:
Andrew Morton, David Hildenbrand, Linus Torvalds
Currently we waited for all cgwbs to get freed in cgwb_bdi_destroy() which also means that writeback has been shutdown on them. Since this wait is going away, directly shutdown writeback on cgwbs from cgwb_bdi_destroy() to avoid live writeback structures after bdi_unregister() has finished. Signed-off-by: Jan Kara <jack@suse.cz> --- mm/backing-dev.c | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 54b9e934eef4..c9623b410170 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c@@ -700,6 +700,7 @@ static void cgwb_bdi_destroy(struct backing_dev_info *bdi) struct radix_tree_iter iter; struct rb_node *rbn; void **slot; + struct wb_writeback *wb; WARN_ON(test_bit(WB_registered, &bdi->wb.state));
@@ -716,6 +717,14 @@ static void cgwb_bdi_destroy(struct backing_dev_info *bdi) congested->__bdi = NULL; /* mark @congested unlinked */ } + while (!list_empty(&bdi->wb_list)) { + wb = list_first_entry(&bdi->wb_list, struct bdi_writeback, + bdi_node); + spin_unlock_irq(&cgwb_lock); + wb_shutdown(wb); + spin_lock_irq(&cgwb_lock); + } + spin_unlock_irq(&cgwb_lock); /*
--
2.10.2