From 9e374e7b729dc9f68be89cd3e3b1d4d48c768ecf Mon Sep 17 00:00:00 2001
From: Tom Rini <trini@ti.com>
Date: Mon, 24 Nov 2014 11:50:46 -0500
Subject: fs/ext4/ext4fs.c, fs/fs.c fs/fat/fat_write.c: Adjust 64bit math
 methods

The changes to introduce loff_t into filesize means that we need to do
64bit math on 32bit platforms.  Make sure we use the right wrappers for
these operations.

Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Cc: Suriyan Ramasami <suriyan.r@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Rini <trini@ti.com>
Tested-by: Pierre Aubert <p.aubert@staubli.com>
---
 fs/ext4/ext4fs.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

(limited to 'fs/ext4')

diff --git a/fs/ext4/ext4fs.c b/fs/ext4/ext4fs.c
index 943b5bcf35..258b93791b 100644
--- a/fs/ext4/ext4fs.c
+++ b/fs/ext4/ext4fs.c
@@ -25,6 +25,7 @@
 #include <ext_common.h>
 #include <ext4fs.h>
 #include "ext4_common.h"
+#include <div64.h>
 
 int ext4fs_symlinknest;
 struct ext_filesystem ext_fs;
@@ -67,11 +68,11 @@ int ext4fs_read_file(struct ext2fs_node *node, loff_t pos,
 	if (len > filesize)
 		len = filesize;
 
-	blockcnt = ((len + pos) + blocksize - 1) / blocksize;
+	blockcnt = lldiv(((len + pos) + blocksize - 1), blocksize);
 
-	for (i = pos / blocksize; i < blockcnt; i++) {
+	for (i = lldiv(pos, blocksize); i < blockcnt; i++) {
 		lbaint_t blknr;
-		int blockoff = pos % blocksize;
+		int blockoff = pos - (blocksize * i);
 		int blockend = blocksize;
 		int skipfirst = 0;
 		blknr = read_allocated_block(&(node->inode), i);
@@ -82,7 +83,7 @@ int ext4fs_read_file(struct ext2fs_node *node, loff_t pos,
 
 		/* Last block.  */
 		if (i == blockcnt - 1) {
-			blockend = (len + pos) % blocksize;
+			blockend = (len + pos) - (blocksize * i);
 
 			/* The last portion is exactly blocksize. */
 			if (!blockend)
@@ -90,7 +91,7 @@ int ext4fs_read_file(struct ext2fs_node *node, loff_t pos,
 		}
 
 		/* First block. */
-		if (i == pos / blocksize) {
+		if (i == lldiv(pos, blocksize)) {
 			skipfirst = blockoff;
 			blockend -= skipfirst;
 		}
-- 
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