compat-ioctl.c: fix compile with no CONFIG_JBD

The ext3 compat-ioctl translation wants to translate data structures
that <linux/jbd.h> only declared when CONFIG_JBD was enabled.

So make <linux/jbd.h> play nicely even when we don't actually end up
using it.
Acked-by: Andrew Morton <akpm@osdl.org>
Acked-by: Jeffrey Hundstad <jeffrey.hundstad@mnsu.edu>
Acked-by: Zan Lynx <zlynx@acm.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

include/linux/jbd.h

@@ -16,8 +16,6 @@
 #ifndef _LINUX_JBD_H
 #define _LINUX_JBD_H
 
-#if defined(CONFIG_JBD) || defined(CONFIG_JBD_MODULE) || !defined(__KERNEL__)
-
 /* Allow this file to be included directly into e2fsprogs */
 #ifndef __KERNEL__
 #include "jfs_compat.h"
@@ -1083,19 +1081,4 @@ extern int jbd_blocks_per_page(struct inode *inode);
 
 #endif	/* __KERNEL__ */
 
-#endif	/* CONFIG_JBD || CONFIG_JBD_MODULE || !__KERNEL__ */
-
-/*
- * Compatibility no-ops which allow the kernel to compile without CONFIG_JBD
- * go here.
- */
-
-#if defined(__KERNEL__) && !(defined(CONFIG_JBD) || defined(CONFIG_JBD_MODULE))
-
-#define J_ASSERT(expr)			do {} while (0)
-#define J_ASSERT_BH(bh, expr)		do {} while (0)
-#define buffer_jbd(bh)			0
-#define journal_buffer_journal_lru(bh)	0
-
-#endif	/* defined(__KERNEL__) && !defined(CONFIG_JBD) */
 #endif	/* _LINUX_JBD_H */