---

yaml --- r: 167916 b: refs/heads/master c: 592b09a h: refs/heads/master v: v3
git-mirror · Oct 29, 2009 · 7e1aa62 · 7e1aa62
1 parent fbaac7a
commit 7e1aa62
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Showing 2 changed files with 17 additions and 1 deletion.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 960cc0f4fef607baabc2232fbd7cce5368a9dcfd
+refs/heads/master: 592b09a42fc3ae6737a0f3ecf4fee42ecd0296f8
diff --git a/trunk/mm/backing-dev.c b/trunk/mm/backing-dev.c
@@ -610,6 +610,21 @@ 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) {
@@ -682,6 +697,7 @@ void bdi_destroy(struct backing_dev_info *bdi)
 		spin_unlock(&inode_lock);
 	}
 
+	bdi_prune_sb(bdi);
 	bdi_unregister(bdi);
 
 	for (i = 0; i < NR_BDI_STAT_ITEMS; i++)