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-rw-r--r--mm/backing-dev.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 5a37e205571..11aee09dd2a 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -610,9 +610,26 @@ static void bdi_wb_shutdown(struct backing_dev_info *bdi)
kthread_stop(wb->task);
}
+/*
+ * This bdi is going away now, make sure that no super_blocks point to it
+ */
+static void bdi_prune_sb(struct backing_dev_info *bdi)
+{
+ struct super_block *sb;
+
+ spin_lock(&sb_lock);
+ list_for_each_entry(sb, &super_blocks, s_list) {
+ if (sb->s_bdi == bdi)
+ sb->s_bdi = NULL;
+ }
+ spin_unlock(&sb_lock);
+}
+
void bdi_unregister(struct backing_dev_info *bdi)
{
if (bdi->dev) {
+ bdi_prune_sb(bdi);
+
if (!bdi_cap_flush_forker(bdi))
bdi_wb_shutdown(bdi);
bdi_debug_unregister(bdi);