diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index b155a0e..633e559 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1229,6 +1229,7 @@
 #define BTRFS_MOUNT_DISCARD		(1 << 10)
 #define BTRFS_MOUNT_FORCE_COMPRESS      (1 << 11)
 #define BTRFS_MOUNT_SPACE_CACHE		(1 << 12)
+#define BTRFS_MOUNT_CLEAR_CACHE		(1 << 13)
 
 #define btrfs_clear_opt(o, opt)		((o) &= ~BTRFS_MOUNT_##opt)
 #define btrfs_set_opt(o, opt)		((o) |= BTRFS_MOUNT_##opt)
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 137833e..1a94ee4 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -8198,6 +8198,8 @@
 	if (cache_gen != 0 &&
 	    btrfs_super_generation(&root->fs_info->super_copy) != cache_gen)
 		need_clear = 1;
+	if (btrfs_test_opt(root, CLEAR_CACHE))
+		need_clear = 1;
 
 	while (1) {
 		ret = find_first_block_group(root, path, &key);
diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index baa1934..22ee0dc 100644
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -242,8 +242,6 @@
 	 */
 	spin_lock(&block_group->lock);
 	if (block_group->disk_cache_state != BTRFS_DC_WRITTEN) {
-		printk(KERN_ERR "not reading block group %llu, dcs is %d\n", block_group->key.objectid,
-		       block_group->disk_cache_state);
 		spin_unlock(&block_group->lock);
 		return 0;
 	}
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 5c23eb8..5f56213 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -68,7 +68,7 @@
 	Opt_nodatacow, Opt_max_inline, Opt_alloc_start, Opt_nobarrier, Opt_ssd,
 	Opt_nossd, Opt_ssd_spread, Opt_thread_pool, Opt_noacl, Opt_compress,
 	Opt_compress_force, Opt_notreelog, Opt_ratio, Opt_flushoncommit,
-	Opt_discard, Opt_space_cache, Opt_err,
+	Opt_discard, Opt_space_cache, Opt_clear_cache, Opt_err,
 };
 
 static match_table_t tokens = {
@@ -93,6 +93,7 @@
 	{Opt_ratio, "metadata_ratio=%d"},
 	{Opt_discard, "discard"},
 	{Opt_space_cache, "space_cache"},
+	{Opt_clear_cache, "clear_cache"},
 	{Opt_err, NULL},
 };
 
@@ -239,6 +240,9 @@
 		case Opt_space_cache:
 			printk(KERN_INFO "btrfs: enabling disk space caching\n");
 			btrfs_set_opt(info->mount_opt, SPACE_CACHE);
+		case Opt_clear_cache:
+			printk(KERN_INFO "btrfs: force clearing of disk cache\n");
+			btrfs_set_opt(info->mount_opt, CLEAR_CACHE);
 			break;
 		case Opt_err:
 			printk(KERN_INFO "btrfs: unrecognized mount option "