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Diffstat (limited to 'mm/backing-dev.c')
-rw-r--r--mm/backing-dev.c19
1 files changed, 18 insertions, 1 deletions
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 3d2983752e24..1eead4761011 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -2,8 +2,9 @@
#include <linux/wait.h>
#include <linux/rbtree.h>
-#include <linux/backing-dev.h>
#include <linux/kthread.h>
+#include <linux/backing-dev.h>
+#include <linux/blk-cgroup.h>
#include <linux/freezer.h>
#include <linux/fs.h>
#include <linux/pagemap.h>
@@ -974,6 +975,22 @@ void bdi_put(struct backing_dev_info *bdi)
}
EXPORT_SYMBOL(bdi_put);
+struct backing_dev_info *inode_to_bdi(struct inode *inode)
+{
+ struct super_block *sb;
+
+ if (!inode)
+ return &noop_backing_dev_info;
+
+ sb = inode->i_sb;
+#ifdef CONFIG_BLOCK
+ if (sb_is_blkdev_sb(sb))
+ return I_BDEV(inode)->bd_disk->bdi;
+#endif
+ return sb->s_bdi;
+}
+EXPORT_SYMBOL(inode_to_bdi);
+
const char *bdi_dev_name(struct backing_dev_info *bdi)
{
if (!bdi || !bdi->dev)