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, 1 insertions, 1 deletions

diff --git a/fs/ext4/dir.c b/fs/ext4/dir.c
index 145a9c0c972d..33888bb58144 100644
--- a/fs/ext4/dir.c
+++ b/fs/ext4/dir.c
@@ -124,7 +124,7 @@ static int ext4_readdir(struct file * filp,
         offset = filp->f_pos & (sb->s_blocksize - 1);
 
         while (!error && !stored && filp->f_pos < inode->i_size) {
-                unsigned long blk = filp->f_pos >> EXT4_BLOCK_SIZE_BITS(sb);
+                ext4_lblk_t blk = filp->f_pos >> EXT4_BLOCK_SIZE_BITS(sb);
                 struct buffer_head map_bh;
                 struct buffer_head *bh = NULL;