1 files changed, 10 insertions, 4 deletions

diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 2d609a5fbfea..c399152de397 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -66,15 +66,21 @@ int writeback_in_progress(struct backing_dev_info *bdi)
 }
 EXPORT_SYMBOL(writeback_in_progress);
 
-static inline struct backing_dev_info *inode_to_bdi(struct inode *inode)
+struct backing_dev_info *inode_to_bdi(struct inode *inode)
 {
-        struct super_block *sb = inode->i_sb;
+        struct super_block *sb;
 
-        if (sb_is_blkdev_sb(sb))
-                return inode->i_mapping->backing_dev_info;
+        if (!inode)
+                return &noop_backing_dev_info;
 
+        sb = inode->i_sb;
+#ifdef CONFIG_BLOCK
+        if (sb_is_blkdev_sb(sb))
+                return blk_get_backing_dev_info(I_BDEV(inode));
+#endif
         return sb->s_bdi;
 }
+EXPORT_SYMBOL_GPL(inode_to_bdi);
 
 static inline struct inode *wb_inode(struct list_head *head)
 {