wic/filemap: Fall back to standard copy when no way to get the block map
For some filesystems, such as aufs which may be used by docker container,
don't support either the SEEK_DATA/HOLE or FIEMAP to get the block
map. So add a FileNobmap class to fall back to standard copy when there
is no way to get the block map.
[Yocto #12988]
Signed-off-by: Kevin Hao <kexin.hao@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit
7934ed49179242f15b413c0275040a3bb6b68876)
Signed-off-by: Steve Sakoman <steve@sakoman.com>
