ext4: Introduce ext4_lblk_t

This patch adds a new data type ext4_lblk_t to represent
the logical file blocks.

This is the preparatory patch to support large files in ext4
The follow up patch with convert the ext4_inode i_blocks to
represent the number of blocks in file system block size. This
changes makes it possible to have a block number 2**32 -1 which
will result in overflow if the block number is represented by
signed long. This patch convert all the block number to type
ext4_lblk_t which is typedef to __u32

Also remove dead code ext4_ext_walk_space

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: Eric Sandeen <sandeen@redhat.com>

1 files changed, 6 insertions, 3 deletions

diff --git a/include/linux/ext4_fs_i.h b/include/linux/ext4_fs_i.h
index 86ddfe2089f3..6c610b67b047 100644
--- a/include/linux/ext4_fs_i.h
+++ b/include/linux/ext4_fs_i.h
@@ -27,6 +27,9 @@ typedef int ext4_grpblk_t;
 /* data type for filesystem-wide blocks number */
 typedef unsigned long long ext4_fsblk_t;
 
+/* data type for file logical block number */
+typedef __u32 ext4_lblk_t;
+
 struct ext4_reserve_window {
         ext4_fsblk_t    _rsv_start;     /* First byte reserved */
         ext4_fsblk_t    _rsv_end;       /* Last byte reserved or 0 */
@@ -48,7 +51,7 @@ struct ext4_block_alloc_info {
          * most-recently-allocated block in this file.
          * We use this for detecting linearly ascending allocation requests.
          */
-        __u32 last_alloc_logical_block;
+        ext4_lblk_t last_alloc_logical_block;
         /*
          * Was i_next_alloc_goal in ext4_inode_info
          * is the *physical* companion to i_next_alloc_block.
@@ -67,7 +70,7 @@ struct ext4_block_alloc_info {
  */
 struct ext4_ext_cache {
         ext4_fsblk_t    ec_start;
-        __u32           ec_block;
+        ext4_lblk_t     ec_block;
         __u32           ec_len; /* must be 32bit to return holes */
         __u32           ec_type;
 };
@@ -95,7 +98,7 @@ struct ext4_inode_info {
         /* block reservation info */
         struct ext4_block_alloc_info *i_block_alloc_info;
 
-        __u32   i_dir_start_lookup;
+        ext4_lblk_t             i_dir_start_lookup;
 #ifdef CONFIG_EXT4DEV_FS_XATTR
         /*
          * Extended attributes can be read independently of the main file