commit 518eaa6387df796d54e065e04502e800cae1df80
author Fabian Frederick <fabf@skynet.be> Thu Sep 15 11:55:01 2016 -0400
committer Theodore Ts'o <tytso@mit.edu> Thu Sep 15 11:55:01 2016 -0400
tree 9b7ce844047f58763185a4a66cb7cd1f80666f51
parent c3fe493ccdb1f443c30155150391835004014c6a

ext4: create EXT4_MAX_BLOCKS() macro

Create a macro to calculate length + offset -> maximum blocks
This adds more readability.

Signed-off-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

fs/ext4/file.c

diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 261ac37..34acda7 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -144,8 +144,7 @@
 			int err, len;
 
 			map.m_lblk = pos >> blkbits;
-			map.m_len = (EXT4_BLOCK_ALIGN(pos + length, blkbits) >> blkbits)
-				- map.m_lblk;
+			map.m_len = EXT4_MAX_BLOCKS(length, pos, blkbits);
 			len = map.m_len;
 
 			err = ext4_map_blocks(NULL, inode, &map, 0);