1 files changed, 3 insertions, 0 deletions

diff --git a/fs/ntfs/ntfs.h b/fs/ntfs/ntfs.h
index e85f6e928b1e..446b5014115c 100644
--- a/fs/ntfs/ntfs.h
+++ b/fs/ntfs/ntfs.h
@@ -31,6 +31,7 @@
 #include <linux/fs.h>
 #include <linux/nls.h>
 #include <linux/smp.h>
+#include <linux/pagemap.h>
 
 #include "types.h"
 #include "volume.h"
@@ -42,6 +43,8 @@ typedef enum {
         NTFS_SB_MAGIC           = 0x5346544e,   /* 'NTFS' */
         NTFS_MAX_NAME_LEN       = 255,
         NTFS_MAX_ATTR_NAME_LEN  = 255,
+        NTFS_MAX_CLUSTER_SIZE   = 64 * 1024,    /* 64kiB */
+        NTFS_MAX_PAGES_PER_CLUSTER = NTFS_MAX_CLUSTER_SIZE / PAGE_CACHE_SIZE,
 } NTFS_CONSTANTS;
 
 /* Global variables. */