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-rw-r--r--block/blk-core.c2
-rw-r--r--block/blk-sysfs.c1
-rw-r--r--include/linux/backing-dev.h6
-rw-r--r--mm/backing-dev.c12
4 files changed, 18 insertions, 3 deletions
diff --git a/block/blk-core.c b/block/blk-core.c
index 2eb722d48773..18e92a6645e2 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -576,7 +576,7 @@ void blk_cleanup_queue(struct request_queue *q)
q->queue_lock = &q->__queue_lock;
spin_unlock_irq(lock);
- bdi_destroy(&q->backing_dev_info);
+ bdi_unregister(&q->backing_dev_info);
/* @q is and will stay empty, shutdown and put */
blk_put_queue(q);
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 3e44a9da2a13..07b42f5ad797 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -540,6 +540,7 @@ static void blk_release_queue(struct kobject *kobj)
struct request_queue *q =
container_of(kobj, struct request_queue, kobj);
+ bdi_exit(&q->backing_dev_info);
blkcg_exit_queue(q);
if (q->elevator) {
diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h
index 78677e5a65bf..c85f74946a8b 100644
--- a/include/linux/backing-dev.h
+++ b/include/linux/backing-dev.h
@@ -19,13 +19,17 @@
#include <linux/slab.h>
int __must_check bdi_init(struct backing_dev_info *bdi);
-void bdi_destroy(struct backing_dev_info *bdi);
+void bdi_exit(struct backing_dev_info *bdi);
__printf(3, 4)
int bdi_register(struct backing_dev_info *bdi, struct device *parent,
const char *fmt, ...);
int bdi_register_dev(struct backing_dev_info *bdi, dev_t dev);
+void bdi_unregister(struct backing_dev_info *bdi);
+
int __must_check bdi_setup_and_register(struct backing_dev_info *, char *);
+void bdi_destroy(struct backing_dev_info *bdi);
+
void wb_start_writeback(struct bdi_writeback *wb, long nr_pages,
bool range_cyclic, enum wb_reason reason);
void wb_start_background_writeback(struct bdi_writeback *wb);
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index e92d77937fd3..9e841399041a 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -835,7 +835,7 @@ static void bdi_remove_from_list(struct backing_dev_info *bdi)
synchronize_rcu_expedited();
}
-void bdi_destroy(struct backing_dev_info *bdi)
+void bdi_unregister(struct backing_dev_info *bdi)
{
/* make sure nobody finds us on the bdi_list anymore */
bdi_remove_from_list(bdi);
@@ -847,9 +847,19 @@ void bdi_destroy(struct backing_dev_info *bdi)
device_unregister(bdi->dev);
bdi->dev = NULL;
}
+}
+void bdi_exit(struct backing_dev_info *bdi)
+{
+ WARN_ON_ONCE(bdi->dev);
wb_exit(&bdi->wb);
}
+
+void bdi_destroy(struct backing_dev_info *bdi)
+{
+ bdi_unregister(bdi);
+ bdi_exit(bdi);
+}
EXPORT_SYMBOL(bdi_destroy);
/*