xfs: move xfs_ioc_scrub_metadata to scrub.c

Move the scrub ioctl handler to scrub.c to keep the code together and to
reduce unnecessary code when CONFIG_XFS_ONLINE_SCRUB=n.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>

fs/xfs/scrub/scrub.c

@@ -578,7 +578,7 @@ xchk_scrub_create_subord(
 }
 
 /* Dispatch metadata scrubbing. */
-int
+STATIC int
 xfs_scrub_metadata(
 	struct file			*file,
 	struct xfs_scrub_metadata	*sm)
@@ -724,3 +724,28 @@ try_harder:
 	run.retries++;
 	goto retry_op;
 }
+
+/* Scrub one aspect of one piece of metadata. */
+int
+xfs_ioc_scrub_metadata(
+	struct file			*file,
+	void				__user *arg)
+{
+	struct xfs_scrub_metadata	scrub;
+	int				error;
+
+	if (!capable(CAP_SYS_ADMIN))
+		return -EPERM;
+
+	if (copy_from_user(&scrub, arg, sizeof(scrub)))
+		return -EFAULT;
+
+	error = xfs_scrub_metadata(file, &scrub);
+	if (error)
+		return error;
+
+	if (copy_to_user(arg, &scrub, sizeof(scrub)))
+		return -EFAULT;
+
+	return 0;
+}

fs/xfs/scrub/xfs_scrub.h

@@ -7,9 +7,9 @@
 #define __XFS_SCRUB_H__
 
 #ifndef CONFIG_XFS_ONLINE_SCRUB
-# define xfs_scrub_metadata(file, sm)	(-ENOTTY)
+# define xfs_ioc_scrub_metadata(f, a)	(-ENOTTY)
 #else
-int xfs_scrub_metadata(struct file *file, struct xfs_scrub_metadata *sm);
+int xfs_ioc_scrub_metadata(struct file *file, void __user *arg);
 #endif /* CONFIG_XFS_ONLINE_SCRUB */
 
 #endif	/* __XFS_SCRUB_H__ */

fs/xfs/xfs_ioctl.c

@@ -1055,30 +1055,6 @@ out_free:
 	return error;
 }
 
-STATIC int
-xfs_ioc_scrub_metadata(
-	struct file			*file,
-	void				__user *arg)
-{
-	struct xfs_scrub_metadata	scrub;
-	int				error;
-
-	if (!capable(CAP_SYS_ADMIN))
-		return -EPERM;
-
-	if (copy_from_user(&scrub, arg, sizeof(scrub)))
-		return -EFAULT;
-
-	error = xfs_scrub_metadata(file, &scrub);
-	if (error)
-		return error;
-
-	if (copy_to_user(arg, &scrub, sizeof(scrub)))
-		return -EFAULT;
-
-	return 0;
-}
-
 int
 xfs_ioc_swapext(
 	xfs_swapext_t	*sxp)