[PATCH] 2TB files: add blkcnt_t

Add blkcnt_t as the type of inode.i_blocks.  This enables you to make the size
of blkcnt_t either 4 bytes or 8 bytes on 32 bits architecture with CONFIG_LSF.

- CONFIG_LSF
  Add new configuration parameter.
- blkcnt_t
  On h8300, i386, mips, powerpc, s390 and sh that define sector_t,
  blkcnt_t is defined as u64 if CONFIG_LSF is enabled; otherwise it is
  defined as unsigned long.
  On other architectures, it is defined as unsigned long.
- inode.i_blocks
  Change the type from sector_t to blkcnt_t.
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>

block/Kconfig

@@ -23,4 +23,13 @@ config BLK_DEV_IO_TRACE
 
 	  git://brick.kernel.dk/data/git/blktrace.git
 
+config LSF
+	bool "Support for Large Single Files"
+	depends on X86 || (MIPS && 32BIT) || PPC32 || ARCH_S390_31 || SUPERH || UML
+	default n
+	help
+	  When CONFIG_LBD is disabled, say Y here if you want to
+	  handle large file(bigger than 2TB), otherwise say N.
+	  When CONFIG_LBD is enabled, Y is set automatically.
+
 source block/Kconfig.iosched

include/asm-h8300/types.h

@@ -58,6 +58,9 @@ typedef u32 dma_addr_t;
 #define HAVE_SECTOR_T
 typedef u64 sector_t;
 
+#define HAVE_BLKCNT_T
+typedef u64 blkcnt_t;
+
 #endif /* __KERNEL__ */
 
 #endif /* __ASSEMBLY__ */

include/asm-i386/types.h

@@ -63,6 +63,11 @@ typedef u64 sector_t;
 #define HAVE_SECTOR_T
 #endif
 
+#ifdef CONFIG_LSF
+typedef u64 blkcnt_t;
+#define HAVE_BLKCNT_T
+#endif
+
 #endif /* __ASSEMBLY__ */
 
 #endif /* __KERNEL__ */

include/asm-mips/types.h

@@ -99,6 +99,11 @@ typedef u64 sector_t;
 #define HAVE_SECTOR_T
 #endif
 
+#ifdef CONFIG_LSF
+typedef u64 blkcnt_t;
+#define HAVE_BLKCNT_T
+#endif
+
 #endif /* __ASSEMBLY__ */
 
 #endif /* __KERNEL__ */

include/asm-powerpc/types.h

@@ -103,6 +103,11 @@ typedef u64 sector_t;
 #define HAVE_SECTOR_T
 #endif
 
+#ifdef CONFIG_LSF
+typedef u64 blkcnt_t;
+#define HAVE_BLKCNT_T
+#endif
+
 #endif /* __ASSEMBLY__ */
 
 #endif /* __KERNEL__ */

include/asm-s390/types.h

@@ -93,6 +93,11 @@ typedef u64 sector_t;
 #define HAVE_SECTOR_T
 #endif
 
+#ifdef CONFIG_LSF
+typedef u64 blkcnt_t;
+#define HAVE_BLKCNT_T
+#endif
+
 #endif /* ! __s390x__   */
 #endif /* __ASSEMBLY__  */
 #endif /* __KERNEL__    */

include/asm-sh/types.h

@@ -58,6 +58,11 @@ typedef u64 sector_t;
 #define HAVE_SECTOR_T
 #endif
 
+#ifdef CONFIG_LSF
+typedef u64 blkcnt_t;
+#define HAVE_BLKCNT_T
+#endif
+
 #endif /* __ASSEMBLY__ */
 
 #endif /* __KERNEL__ */

include/linux/fs.h

@@ -490,7 +490,7 @@ struct inode {
 	unsigned int		i_blkbits;
 	unsigned long		i_blksize;
 	unsigned long		i_version;
-	sector_t		i_blocks;
+	blkcnt_t		i_blocks;
 	unsigned short          i_bytes;
 	spinlock_t		i_lock;	/* i_blocks, i_bytes, maybe i_size */
 	struct mutex		i_mutex;

include/linux/types.h

@@ -137,6 +137,10 @@ typedef		__s64		int64_t;
 typedef unsigned long sector_t;
 #endif
 
+#ifndef HAVE_BLKCNT_T
+typedef unsigned long blkcnt_t;
+#endif
+
 /*
  * The type of an index into the pagecache.  Use a #define so asm/types.h
  * can override it.