Fixes (2) for 5.9:

- Fix a broken metadata verifier that would incorrectly validate attr
 fork extents of a realtime file against the realtime volume.
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Merge tag 'xfs-5.9-fixes-2' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux

Pull xfs fix from Darrick Wong:
 "Fix a broken metadata verifier that would incorrectly validate attr
  fork extents of a realtime file against the realtime volume"

* tag 'xfs-5.9-fixes-2' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
  xfs: fix xfs_bmap_validate_extent_raw when checking attr fork of rt files

fs/xfs/libxfs/xfs_bmap.c

@@ -6226,7 +6226,7 @@ xfs_bmap_validate_extent(
 
 	isrt = XFS_IS_REALTIME_INODE(ip);
 	endfsb = irec->br_startblock + irec->br_blockcount - 1;
-	if (isrt) {
+	if (isrt && whichfork == XFS_DATA_FORK) {
 		if (!xfs_verify_rtbno(mp, irec->br_startblock))
 			return __this_address;
 		if (!xfs_verify_rtbno(mp, endfsb))