xfs: clean up the XFS_IOC_FSCOUNTS handler

Split XFS_IOC_FSCOUNTS out of the main xfs_file_ioctl function, and
merge the xfs_fs_counts helper into the ioctl handler.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Signed-off-by: Chandan Babu R <chandanbabu@kernel.org>

fs/xfs/xfs_fsops.c

@@ -343,22 +343,6 @@ xfs_growfs_log(
 	return error;
 }
 
-/*
- * exported through ioctl XFS_IOC_FSCOUNTS
- */
-
-void
-xfs_fs_counts(
-	xfs_mount_t		*mp,
-	xfs_fsop_counts_t	*cnt)
-{
-	cnt->allocino = percpu_counter_read_positive(&mp->m_icount);
-	cnt->freeino = percpu_counter_read_positive(&mp->m_ifree);
-	cnt->freedata = percpu_counter_read_positive(&mp->m_fdblocks) -
-						xfs_fdblocks_unavailable(mp);
-	cnt->freertx = percpu_counter_read_positive(&mp->m_frextents);
-}
-
 /*
  * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS
  *

fs/xfs/xfs_fsops.h

@@ -8,7 +8,6 @@
 
 extern int xfs_growfs_data(struct xfs_mount *mp, struct xfs_growfs_data *in);
 extern int xfs_growfs_log(struct xfs_mount *mp, struct xfs_growfs_log *in);
-extern void xfs_fs_counts(xfs_mount_t *mp, xfs_fsop_counts_t *cnt);
 extern int xfs_reserve_blocks(xfs_mount_t *mp, uint64_t *inval,
 				xfs_fsop_resblks_t *outval);
 extern int xfs_fs_goingdown(xfs_mount_t *mp, uint32_t inflags);

fs/xfs/xfs_ioctl.c

@@ -1912,6 +1912,24 @@ xfs_ioctl_getset_resblocks(
 	return 0;
 }
 
+static int
+xfs_ioctl_fs_counts(
+	struct xfs_mount	*mp,
+	struct xfs_fsop_counts __user	*uarg)
+{
+	struct xfs_fsop_counts	out = {
+		.allocino = percpu_counter_read_positive(&mp->m_icount),
+		.freeino  = percpu_counter_read_positive(&mp->m_ifree),
+		.freedata = percpu_counter_read_positive(&mp->m_fdblocks) -
+				xfs_fdblocks_unavailable(mp),
+		.freertx  = percpu_counter_read_positive(&mp->m_frextents),
+	};
+
+	if (copy_to_user(uarg, &out, sizeof(out)))
+		return -EFAULT;
+	return 0;
+}
+
 /*
  * These long-unused ioctls were removed from the official ioctl API in 5.17,
  * but retain these definitions so that we can log warnings about them.
@@ -2048,15 +2066,8 @@ xfs_file_ioctl(
 		return error;
 	}
 
-	case XFS_IOC_FSCOUNTS: {
-		xfs_fsop_counts_t out;
-
-		xfs_fs_counts(mp, &out);
-
-		if (copy_to_user(arg, &out, sizeof(out)))
-			return -EFAULT;
-		return 0;
-	}
+	case XFS_IOC_FSCOUNTS:
+		return xfs_ioctl_fs_counts(mp, arg);
 
 	case XFS_IOC_SET_RESBLKS:
 	case XFS_IOC_GET_RESBLKS: