[PATCH] direct-io: Minor cleanups in do_blockdev_direct_IO

[Nikolay Borisov <nborisov@suse.com>]

We already get the block counts and the calculate the end block at the
beginning of the function. Let's use the local variables for consistency and
readability. No functional changes

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
---
Andrew, 

Sending to you since this has been languishing on the mailing for quite some 
time. The patch has been reviewed here:
https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1460544.html

fs/direct-io.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/fs/direct-io.c b/fs/direct-io.c
index a8131087aa1c..a73448a501c2 100644
--- a/fs/direct-io.c
+++ b/fs/direct-io.c
@@ -1200,7 +1200,7 @@ do_blockdev_direct_IO(struct kiocb *iocb, struct inode *inode,
 	}
 
 	/* watch out for a 0 len io from a tricksy fs */
-	if (iov_iter_rw(iter) == READ && !iov_iter_count(iter))
+	if (iov_iter_rw(iter) == READ && !count)
 		return 0;
 
 	dio = kmem_cache_alloc(dio_cache, GFP_KERNEL);
@@ -1316,8 +1316,7 @@ do_blockdev_direct_IO(struct kiocb *iocb, struct inode *inode,
 
 	dio->should_dirty = (iter->type == ITER_IOVEC);
 	sdio.iter = iter;
-	sdio.final_block_in_request =
-		(offset + iov_iter_count(iter)) >> blkbits;
+	sdio.final_block_in_request = end >> blkbits;
 
 	/*
 	 * In case of non-aligned buffers, we may need 2 more
-- 
2.7.4