1 files changed, 23 insertions, 0 deletions

diff --git a/fs/block_dev.c b/fs/block_dev.c
index 4346468139e8..0c361ea7e5a6 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -17,11 +17,13 @@
 #include <linux/module.h>
 #include <linux/blkpg.h>
 #include <linux/buffer_head.h>
+#include <linux/writeback.h>
 #include <linux/mpage.h>
 #include <linux/mount.h>
 #include <linux/uio.h>
 #include <linux/namei.h>
 #include <asm/uaccess.h>
+#include "internal.h"
 
 struct bdev_inode {
         struct block_device bdev;
@@ -1313,3 +1315,24 @@ void close_bdev_excl(struct block_device *bdev)
 }
 
 EXPORT_SYMBOL(close_bdev_excl);
+
+int __invalidate_device(struct block_device *bdev)
+{
+        struct super_block *sb = get_super(bdev);
+        int res = 0;
+
+        if (sb) {
+                /*
+                 * no need to lock the super, get_super holds the
+                 * read mutex so the filesystem cannot go away
+                 * under us (->put_super runs with the write lock
+                 * hold).
+                 */
+                shrink_dcache_sb(sb);
+                res = invalidate_inodes(sb);
+                drop_super(sb);
+        }
+        invalidate_bdev(bdev, 0);
+        return res;
+}
+EXPORT_SYMBOL(__invalidate_device);