fat: don't use free_clusters for fat32

It seems that the recent Windows changed specification, and it's
undocumented.  Windows doesn't update ->free_clusters correctly.

This patch doesn't use ->free_clusters by default.  (instead, add "usefree"
for forcing to use it)

Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Cc: Juergen Beisert <juergen127@kreuzholzen.de>
Cc: Andreas Schwab <schwab@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/include/linux/msdos_fs.h b/include/linux/msdos_fs.h
index fa253fa73aa3..0e09c005dda8 100644
--- a/include/linux/msdos_fs.h
+++ b/include/linux/msdos_fs.h
@@ -205,7 +205,8 @@ struct fat_mount_options {
                  numtail:1,       /* Does first alias have a numeric '~1' type tail? */
                  atari:1,         /* Use Atari GEMDOS variation of MS-DOS fs */
                  flush:1,         /* write things quickly */
-                 nocase:1;        /* Does this need case conversion? 0=need case conversion*/
+                 nocase:1,        /* Does this need case conversion? 0=need case conversion*/
+                 usefree:1;       /* Use free_clusters for FAT32 */
 };
 
 #define FAT_HASH_BITS   8