ext4: add ext4_group_t, and change all group variables to this type.
In many places variables for block group are of type int, which limits the
maximum number of block groups to 2^31. Each block group can have up to
2^15 blocks, with a 4K block size, and the max filesystem size is limited to
2^31 * (2^15 * 2^12) = 2^58 -- or 256 PB
This patch introduces a new type ext4_group_t, of type unsigned long, to
represent block group numbers in ext4.
All occurrences of block group variables are converted to type ext4_group_t.
Signed-off-by: Avantika Mathur <mathur@us.ibm.com>
diff --git a/include/linux/ext4_fs_i.h b/include/linux/ext4_fs_i.h
index 6c610b6..2b4e370 100644
--- a/include/linux/ext4_fs_i.h
+++ b/include/linux/ext4_fs_i.h
@@ -30,6 +30,9 @@
/* data type for file logical block number */
typedef __u32 ext4_lblk_t;
+/* data type for block group number */
+typedef unsigned long ext4_group_t;
+
struct ext4_reserve_window {
ext4_fsblk_t _rsv_start; /* First byte reserved */
ext4_fsblk_t _rsv_end; /* Last byte reserved or 0 */
@@ -92,7 +95,7 @@
* place a file's data blocks near its inode block, and new inodes
* near to their parent directory's inode.
*/
- __u32 i_block_group;
+ ext4_group_t i_block_group;
__u32 i_state; /* Dynamic state flags for ext4 */
/* block reservation info */