xfs: refactor xfs_inode_item_size

Split out two helpers to size the data and attribute to make the
function more readable.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

fs/xfs/xfs_inode_item.c

@@ -39,27 +39,14 @@ static inline struct xfs_inode_log_item *INODE_ITEM(struct xfs_log_item *lip)
 	return container_of(lip, struct xfs_inode_log_item, ili_item);
 }
 
-
-/*
- * This returns the number of iovecs needed to log the given inode item.
- *
- * We need one iovec for the inode log format structure, one for the
- * inode core, and possibly one for the inode data/extents/b-tree root
- * and one for the inode attribute data/extents/b-tree root.
- */
 STATIC void
-xfs_inode_item_size(
-	struct xfs_log_item	*lip,
+xfs_inode_item_data_fork_size(
+	struct xfs_inode_log_item *iip,
 	int			*nvecs,
 	int			*nbytes)
 {
-	struct xfs_inode_log_item *iip = INODE_ITEM(lip);
 	struct xfs_inode	*ip = iip->ili_inode;
 
-	*nvecs += 2;
-	*nbytes += sizeof(struct xfs_inode_log_format) +
-		   xfs_icdinode_size(ip->i_d.di_version);
-
 	switch (ip->i_d.di_format) {
 	case XFS_DINODE_FMT_EXTENTS:
 		if ((iip->ili_fields & XFS_ILOG_DEXT) &&
@@ -70,15 +57,13 @@ xfs_inode_item_size(
 			*nvecs += 1;
 		}
 		break;
-
 	case XFS_DINODE_FMT_BTREE:
 		if ((iip->ili_fields & XFS_ILOG_DBROOT) &&
 		    ip->i_df.if_broot_bytes > 0) {
 			*nbytes += ip->i_df.if_broot_bytes;
 			*nvecs += 1;
 		}
 		break;
-
 	case XFS_DINODE_FMT_LOCAL:
 		if ((iip->ili_fields & XFS_ILOG_DDATA) &&
 		    ip->i_df.if_bytes > 0) {
@@ -90,19 +75,20 @@ xfs_inode_item_size(
 	case XFS_DINODE_FMT_DEV:
 	case XFS_DINODE_FMT_UUID:
 		break;
-
 	default:
 		ASSERT(0);
 		break;
 	}
+}
 
-	if (!XFS_IFORK_Q(ip))
-		return;
-
+STATIC void
+xfs_inode_item_attr_fork_size(
+	struct xfs_inode_log_item *iip,
+	int			*nvecs,
+	int			*nbytes)
+{
+	struct xfs_inode	*ip = iip->ili_inode;
 
-	/*
-	 * Log any necessary attribute data.
-	 */
 	switch (ip->i_d.di_aformat) {
 	case XFS_DINODE_FMT_EXTENTS:
 		if ((iip->ili_fields & XFS_ILOG_AEXT) &&
@@ -113,29 +99,51 @@ xfs_inode_item_size(
 			*nvecs += 1;
 		}
 		break;
-
 	case XFS_DINODE_FMT_BTREE:
 		if ((iip->ili_fields & XFS_ILOG_ABROOT) &&
 		    ip->i_afp->if_broot_bytes > 0) {
 			*nbytes += ip->i_afp->if_broot_bytes;
 			*nvecs += 1;
 		}
 		break;
-
 	case XFS_DINODE_FMT_LOCAL:
 		if ((iip->ili_fields & XFS_ILOG_ADATA) &&
 		    ip->i_afp->if_bytes > 0) {
 			*nbytes += roundup(ip->i_afp->if_bytes, 4);
 			*nvecs += 1;
 		}
 		break;
-
 	default:
 		ASSERT(0);
 		break;
 	}
 }
 
+/*
+ * This returns the number of iovecs needed to log the given inode item.
+ *
+ * We need one iovec for the inode log format structure, one for the
+ * inode core, and possibly one for the inode data/extents/b-tree root
+ * and one for the inode attribute data/extents/b-tree root.
+ */
+STATIC void
+xfs_inode_item_size(
+	struct xfs_log_item	*lip,
+	int			*nvecs,
+	int			*nbytes)
+{
+	struct xfs_inode_log_item *iip = INODE_ITEM(lip);
+	struct xfs_inode	*ip = iip->ili_inode;
+
+	*nvecs += 2;
+	*nbytes += sizeof(struct xfs_inode_log_format) +
+		   xfs_icdinode_size(ip->i_d.di_version);
+
+	xfs_inode_item_data_fork_size(iip, nvecs, nbytes);
+	if (XFS_IFORK_Q(ip))
+		xfs_inode_item_attr_fork_size(iip, nvecs, nbytes);
+}
+
 /*
  * xfs_inode_item_format_extents - convert in-core extents to on-disk form
  *