ext4: Support large files

This patch converts ext4_inode i_blocks to represent total
blocks occupied by the inode in file system block size.
Earlier the variable used to represent this in 512 byte
block size. This actually limited the total size of the file.

The feature is enabled transparently when we write an inode
whose i_blocks cannot be represnted as 512 byte units in a
48 bit variable.

inode flag  EXT4_HUGE_FILE_FL

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/include/linux/ext4_fs.h b/include/linux/ext4_fs.h
index be25eca9c040..6ae91f40aaa2 100644
--- a/include/linux/ext4_fs.h
+++ b/include/linux/ext4_fs.h
@@ -178,8 +178,9 @@ struct ext4_group_desc
 #define EXT4_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
 #define EXT4_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
 #define EXT4_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
-#define EXT4_RESERVED_FL                0x80000000 /* reserved for ext4 lib */
+#define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
 #define EXT4_EXTENTS_FL                 0x00080000 /* Inode uses extents */
+#define EXT4_RESERVED_FL                0x80000000 /* reserved for ext4 lib */
 
 #define EXT4_FL_USER_VISIBLE            0x000BDFFF /* User visible flags */
 #define EXT4_FL_USER_MODIFIABLE         0x000380FF /* User modifiable flags */