[PATCH] 2TB files: change type of kstatfs entries

This fix was proposed by Trond Myklebust.  He says: The type "sector_t" is
heavily tied in to the block layer interface as an offset/handle to a block,
and is subject to a supposedly block-specific configuration option:
CONFIG_LBD.  Despite this, it is used in struct kstatfs to save a couple of
bytes on the stack whenever we call the filesystems' ->statfs().

So kstatfs's entries related to blocks are invalid on statfs64 for a network
filesystem which has more than 2^32-1 blocks when CONFIG_LBD is disabled.

- struct kstatfs
  Change the type of following entries from sector_t to u64.
  f_blocks
  f_bfree
  f_bavail
  f_files
  f_ffree

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Takashi Sato <sho@tnes.nec.co.jp>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

include/linux/statfs.h

@@ -8,11 +8,11 @@
 struct kstatfs {
 	long f_type;
 	long f_bsize;
-	sector_t f_blocks;
-	sector_t f_bfree;
-	sector_t f_bavail;
-	sector_t f_files;
-	sector_t f_ffree;
+	u64 f_blocks;
+	u64 f_bfree;
+	u64 f_bavail;
+	u64 f_files;
+	u64 f_ffree;
 	__kernel_fsid_t f_fsid;
 	long f_namelen;
 	long f_frsize;