FAT write: Fix compile errors

This patch removes compile errors introduced by
commit 9813b750f32c0056f0a35813b9a9ec0f68b664af
'fs/fat: Fix FAT detection to support non-DOS partition tables'

fat_write.c: In function 'disk_write':
fat_write.c:54: error: 'part_offset' undeclared (first use in this function)
fat_write.c:54: error: (Each undeclared identifier is reported only once
fat_write.c:54: error: for each function it appears in.)
fat_write.c: In function 'do_fat_write':
fat_write.c:950: error: 'part_size' undeclared (first use in this function)

These errors only appear when this code is enabled by
defining CONFIG_FAT_WRITE option.

This patch was originally part of

http://article.gmane.org/gmane.comp.boot-loaders.u-boot/121847

Signed-off-by: Donggeun Kim <dg77.kim@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Maximilian Schwerin <mvs@tigris.de>

Fixed patch author and added all needed SoB from the original patch
and also submitter's SoB. Extended commit log.
Signed-off-by: Anatolij Gustschin <agust@denx.de>

fs/fat/fat_write.c

@@ -41,23 +41,19 @@ static void uppercase(char *str, int len)
 }
 
 static int total_sector;
-static int disk_write(__u32 startblock, __u32 getsize, __u8 *bufptr)
+static int disk_write(__u32 block, __u32 nr_blocks, void *buf)
 {
-	if (cur_dev == NULL)
+	if (!cur_dev || !cur_dev->block_write)
 		return -1;
 
-	if (startblock + getsize > total_sector) {
+	if (cur_part_info.start + block + nr_blocks >
+		cur_part_info.start + total_sector) {
 		printf("error: overflow occurs\n");
 		return -1;
 	}
 
-	startblock += part_offset;
-
-	if (cur_dev->block_read) {
-		return cur_dev->block_write(cur_dev->dev, startblock, getsize,
-					   (unsigned long *) bufptr);
-	}
-	return -1;
+	return cur_dev->block_write(cur_dev->dev,
+			cur_part_info.start + block, nr_blocks,	buf);
 }
 
 /*
@@ -797,7 +793,7 @@ static int check_overflow(fsdata *mydata, __u32 clustnum, unsigned long size)
 	if (size % mydata->sect_size)
 		sect_num++;
 
-	if (startsect + sect_num > total_sector)
+	if (startsect + sect_num > cur_part_info.start + total_sector)
 		return -1;
 
 	return 0;
@@ -947,7 +943,7 @@ static int do_fat_write(const char *filename, void *buffer,
 
 	total_sector = bs.total_sect;
 	if (total_sector == 0)
-		total_sector = part_size;
+		total_sector = cur_part_info.size;
 
 	root_cluster = bs.root_cluster;