[PATCH 3/4 v2] code clean up for dio fallocate handling

[Mingming <cmm@us.ibm.com>]

ext4: code clean up for dio fallocate handling

The ext4_debug() call in ext4_end_io_dio() (inode.c) has a
should be moved after checking the io_end structure to be not a NULL pointer.

The comment above ext4_get_block_dio_write() ("Maximum
number of blocks...") is a duplicate; the original and correct comment
is above the #define DIO_MAX_BLOCKS up above.

The check for allocated > max_blocks in ext4_split_unwritten_extents()
can be removed, since the code returns immediately once allocated blocks is
less or equals to the requested blocks to convert.

Based on review comments from Curt Wohlgemuth.

Signed-off-by:	Mingming Cao <cmm@us.ibm.com>
---
 fs/ext4/extents.c |   96 +++++++++++++++++++++++++-----------------------------
 fs/ext4/inode.c   |    9 ++---
 2 files changed, 50 insertions(+), 55 deletions(-)

Index: linux-2.6.31-rc4/fs/ext4/inode.c
===================================================================
--- linux-2.6.31-rc4.orig/fs/ext4/inode.c
+++ linux-2.6.31-rc4/fs/ext4/inode.c
@@ -3367,8 +3367,6 @@ out:
 	return ret;
 }
 
-/* Maximum number of blocks we map for direct IO at once. */