ext4: code clean up for dio fallocate handling

The ext4_debug() call in ext4_end_io_dio() should be moved after the
check to make sure that io_end is non-NULL.

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.

Based on review comments from Curt Wohlgemuth.

Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

1 files changed, 4 insertions, 5 deletions

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index a9ed2bce74d1..2c8caa51addb 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3446,8 +3446,6 @@ out:
         return ret;
 }
 
-/* Maximum number of blocks we map for direct IO at once. */
-
 static int ext4_get_block_dio_write(struct inode *inode, sector_t iblock,
                    struct buffer_head *bh_result, int create)
 {
@@ -3655,13 +3653,14 @@ static void ext4_end_io_dio(struct kiocb *iocb, loff_t offset,
         ext4_io_end_t *io_end = iocb->private;
         struct workqueue_struct *wq;
 
+        /* if not async direct IO or dio with 0 bytes write, just return */
+        if (!io_end || !size)
+                return;
+
         ext_debug("ext4_end_io_dio(): io_end 0x%p"
                   "for inode %lu, iocb 0x%p, offset %llu, size %llu\n",
                   iocb->private, io_end->inode->i_ino, iocb, offset,
                   size);
-        /* if not async direct IO or dio with 0 bytes write, just return */
-        if (!io_end || !size)
-                return;
 
         /* if not aio dio with unwritten extents, just free io and return */
         if (io_end->flag != DIO_AIO_UNWRITTEN){