[2.6 patch] provide generic_block_fiemap() only with BLOCK=y

[Adrian Bunk <bunk@kernel.org>]

This patch fixes the following compile error with CONFIG_BLOCK=n caused 
by commit 68c9d702bb72f367f3b148963ec6cf5e07ff7f65
(generic block based fiemap implementation):

<--  snip  -->

...
  CC      fs/ioctl.o
fs/ioctl.c: In function 'generic_block_fiemap':
fs/ioctl.c:249: error: storage size of 'tmp' isn't known
fs/ioctl.c:272: error: invalid application of 'sizeof' to incomplete type 'struct buffer_head' 
fs/ioctl.c:280: error: implicit declaration of function 'buffer_mapped'
fs/ioctl.c:249: warning: unused variable 'tmp'
make[2]: *** [fs/ioctl.o] Error 1

<--  snip  -->


Signed-off-by: Adrian Bunk <bunk@kernel.org>

---

 fs/ioctl.c |    4 ++++
 1 file changed, 4 insertions(+)


diff --git a/fs/ioctl.c b/fs/ioctl.c
index 33a6b7e..d152856 100644
--- a/fs/ioctl.c
+++ b/fs/ioctl.c
@@ -226,6 +226,8 @@ static int ioctl_fiemap(struct file *filp, unsigned long arg)
 	return error;
 }
 
+#ifdef CONFIG_BLOCK
+
 #define blk_to_logical(inode, blk) (blk << (inode)->i_blkbits)
 #define logical_to_blk(inode, offset) (offset >> (inode)->i_blkbits);
 
@@ -342,6 +344,8 @@ int generic_block_fiemap(struct inode *inode,
 }
 EXPORT_SYMBOL(generic_block_fiemap);
 
+#endif  /*  CONFIG_BLOCK  */
+
 static int file_ioctl(struct file *filp, unsigned int cmd,
 		unsigned long arg)
 {