xfs: fixes for the block mapping checker [v26.1] This series amends the file extent map checking code so that nonexistent cow/attr forks get the ENOENT return they're supposed to; and fixes some incorrect logic about the presence of a cow fork vs. reflink iflag. This has been running on the djcloud for years with no problems. Enjoy! Signed-off-by: Darrick J. Wong <djwong@kernel.org>