fat: fat16 support maximum 4GB file/vol size as WinXP or 7.
Namjae Jeon [Wed, 17 Aug 2011 10:10:09 +0000 (19:10 +0900)]
FAT16 support maximum 4GB vol/file size with 64KB cluster size.

Win NT/XP/7 increased the maximum cluster size to 64KB, and file/vol
size increased 4GB also.  Although increasing, the file size of linux
FAT is still limited at 2GB.

I found that it is limited by sb->maxbytes(0x7fffffff) when partition
is formatted by FAT16.  sb->s_maxbytes in fill_super should be set to
0xffffffff like fat32.

Signed-off-by: Namjae Jeon <linkinjeon@gmail.com>
Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>

fs/fat/inode.c

index 52bcf58..017493b 100644 (file)
@@ -1365,6 +1365,7 @@ int fat_fill_super(struct super_block *sb, void *data, int silent, int isvfat,
        sbi->free_clusters = -1;        /* Don't know yet */
        sbi->free_clus_valid = 0;
        sbi->prev_free = FAT_START_ENT;
+       sb->s_maxbytes = 0xffffffff;
 
        if (!sbi->fat_length && b->fat32_length) {
                struct fat_boot_fsinfo *fsinfo;
@@ -1375,8 +1376,6 @@ int fat_fill_super(struct super_block *sb, void *data, int silent, int isvfat,
                sbi->fat_length = le32_to_cpu(b->fat32_length);
                sbi->root_cluster = le32_to_cpu(b->root_cluster);
 
-               sb->s_maxbytes = 0xffffffff;
-
                /* MC - if info_sector is 0, don't multiply by 0 */
                sbi->fsinfo_sector = le16_to_cpu(b->info_sector);
                if (sbi->fsinfo_sector == 0)