[PATCH] ext4 64 bit divide fix

With CONFIG_LBD=n, sector_div() expands to a plain old divide.  But ext4 is
_not_ passing in a sector_t as the first argument, so...

fs/built-in.o: In function `ext4_get_group_no_and_offset':
fs/ext4/balloc.c:39: undefined reference to `__umoddi3'
fs/ext4/balloc.c:41: undefined reference to `__udivdi3'
fs/built-in.o: In function `find_group_orlov':
fs/ext4/ialloc.c:278: undefined reference to `__udivdi3'
fs/built-in.o: In function `ext4_fill_super':
fs/ext4/super.c:1488: undefined reference to `__udivdi3'
fs/ext4/super.c:1488: undefined reference to `__umoddi3'
fs/ext4/super.c:1594: undefined reference to `__udivdi3'
fs/ext4/super.c:1601: undefined reference to `__umoddi3'

Fix that up by calling do_div() directly.

Also cast the arg to u64.  do_div() is only defined on u64, and ext4_fsblk_t
is supposed to be opaque.

Note especially the changes to find_group_orlov().  It was attempting to do

	do_div(int, unsigned long long);

which is royally screwed up.  Switched it to plain old divide.

Cc: <linux-ext4@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 811011fc5c94..f7ea0224f535 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1485,7 +1485,7 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
          */
         if (blocksize != EXT4_MIN_BLOCK_SIZE) {
                 logic_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
-                offset = sector_div(logic_sb_block, blocksize);
+                offset = do_div(logic_sb_block, blocksize);
         } else {
                 logic_sb_block = sb_block;
         }
@@ -1591,7 +1591,7 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
                 brelse (bh);
                 sb_set_blocksize(sb, blocksize);
                 logic_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
-                offset = sector_div(logic_sb_block, blocksize);
+                offset = do_div(logic_sb_block, blocksize);
                 bh = sb_bread(sb, logic_sb_block);
                 if (!bh) {
                         printk(KERN_ERR