xfs: move the di_extsize field to struct xfs_inode

In preparation of removing the historic icinode struct, move the extsize
field into the containing xfs_inode structure.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index 8d22127..ec76921 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -1120,7 +1120,7 @@ xfs_fill_fsxattr(
 	struct xfs_ifork	*ifp = attr ? ip->i_afp : &ip->i_df;
 
 	simple_fill_fsxattr(fa, xfs_ip2xflags(ip));
-	fa->fsx_extsize = ip->i_d.di_extsize << ip->i_mount->m_sb.sb_blocklog;
+	fa->fsx_extsize = ip->i_extsize << ip->i_mount->m_sb.sb_blocklog;
 	fa->fsx_cowextsize = ip->i_d.di_cowextsize <<
 			ip->i_mount->m_sb.sb_blocklog;
 	fa->fsx_projid = ip->i_projid;
@@ -1223,7 +1223,7 @@ xfs_ioctl_setattr_xflags(
 	/* If realtime flag is set then must have realtime device */
 	if (fa->fsx_xflags & FS_XFLAG_REALTIME) {
 		if (mp->m_sb.sb_rblocks == 0 || mp->m_sb.sb_rextsize == 0 ||
-		    (ip->i_d.di_extsize % mp->m_sb.sb_rextsize))
+		    (ip->i_extsize % mp->m_sb.sb_rextsize))
 			return -EINVAL;
 	}
 
@@ -1347,7 +1347,7 @@ xfs_ioctl_setattr_check_extsize(
 	xfs_fsblock_t		extsize_fsb;
 
 	if (S_ISREG(VFS_I(ip)->i_mode) && ip->i_df.if_nextents &&
-	    ((ip->i_d.di_extsize << mp->m_sb.sb_blocklog) != fa->fsx_extsize))
+	    ((ip->i_extsize << mp->m_sb.sb_blocklog) != fa->fsx_extsize))
 		return -EINVAL;
 
 	if (fa->fsx_extsize == 0)
@@ -1519,9 +1519,9 @@ xfs_ioctl_setattr(
 	 * are set on the inode then unconditionally clear the extent size hint.
 	 */
 	if (ip->i_d.di_flags & (XFS_DIFLAG_EXTSIZE | XFS_DIFLAG_EXTSZINHERIT))
-		ip->i_d.di_extsize = fa->fsx_extsize >> mp->m_sb.sb_blocklog;
+		ip->i_extsize = fa->fsx_extsize >> mp->m_sb.sb_blocklog;
 	else
-		ip->i_d.di_extsize = 0;
+		ip->i_extsize = 0;
 	if (xfs_sb_version_has_v3inode(&mp->m_sb) &&
 	    (ip->i_d.di_flags2 & XFS_DIFLAG2_COWEXTSIZE))
 		ip->i_d.di_cowextsize = fa->fsx_cowextsize >>