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: [PATCH] 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 ++++++-----
 fs/fat/fat_write.c | 10 ++++++----
 fs/fs.c            |  6 ++++--
 3 files changed, 16 insertions(+), 11 deletions(-)

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;
 		}
diff --git a/fs/fat/fat_write.c b/fs/fat/fat_write.c
index 88dd4959cc..98b88add83 100644
--- a/fs/fat/fat_write.c
+++ b/fs/fat/fat_write.c
@@ -13,6 +13,8 @@
 #include <asm/byteorder.h>
 #include <part.h>
 #include <linux/ctype.h>
+#include <div64.h>
+#include <linux/math64.h>
 #include "fat.c"
 
 static void uppercase(char *str, int len)
@@ -770,7 +772,7 @@ static void fill_dentry(fsdata *mydata, dir_entry *dentptr,
  */
 static int check_overflow(fsdata *mydata, __u32 clustnum, loff_t size)
 {
-	__u32 startsect, sect_num;
+	__u32 startsect, sect_num, offset;
 
 	if (clustnum > 0) {
 		startsect = mydata->data_begin +
@@ -779,13 +781,13 @@ static int check_overflow(fsdata *mydata, __u32 clustnum, loff_t size)
 		startsect = mydata->rootdir_sect;
 	}
 
-	sect_num = size / mydata->sect_size;
-	if (size % mydata->sect_size)
+	sect_num = div_u64_rem(size, mydata->sect_size, &offset);
+
+	if (offset != 0)
 		sect_num++;
 
 	if (startsect + sect_num > cur_part_info.start + total_sector)
 		return -1;
-
 	return 0;
 }
 
diff --git a/fs/fs.c b/fs/fs.c
index 3da78606d1..ddd751c9cc 100644
--- a/fs/fs.c
+++ b/fs/fs.c
@@ -23,6 +23,8 @@
 #include <fs.h>
 #include <sandboxfs.h>
 #include <asm/io.h>
+#include <div64.h>
+#include <linux/math64.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -399,7 +401,7 @@ int do_load(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
 	printf("%llu bytes read in %lu ms", len_read, time);
 	if (time > 0) {
 		puts(" (");
-		print_size(len_read / time * 1000, "/s");
+		print_size(div_u64(len_read, time) * 1000, "/s");
 		puts(")");
 	}
 	puts("\n");
@@ -469,7 +471,7 @@ int do_save(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
 	printf("%llu bytes written in %lu ms", len, time);
 	if (time > 0) {
 		puts(" (");
-		print_size(len / time * 1000, "/s");
+		print_size(div_u64(len, time) * 1000, "/s");
 		puts(")");
 	}
 	puts("\n");
-- 
2.30.2