root@Ubuntu:x86_64-linux-gcc# setfattr -n "trusted.udf.test" -v "1234" ./100M-file
root@Ubuntu:x86_64-linux-gcc# ./mkisofs -o /tmp/a.udf -udf ./100M-file
9.69% done, estimate finish Fri Mar 20 21:09:54 2020
19.43% done, estimate finish Fri Mar 20 21:09:54 2020
29.10% done, estimate finish Fri Mar 20 21:09:54 2020
38.77% done, estimate finish Fri Mar 20 21:09:54 2020
48.44% done, estimate finish Fri Mar 20 21:09:54 2020
58.17% done, estimate finish Fri Mar 20 21:09:54 2020
67.84% done, estimate finish Fri Mar 20 21:09:54 2020
77.51% done, estimate finish Fri Mar 20 21:09:54 2020
87.18% done, estimate finish Fri Mar 20 21:09:54 2020
96.92% done, estimate finish Fri Mar 20 21:09:54 2020
Total translation table size: 0
Total rockridge attributes bytes: 0
Total directory bytes: 0
Path table size(bytes): 10
Max brk space used 0
51618 extents written (100 MB)
root@Ubuntu:x86_64-linux-gcc# mount /tmp/a.udf /mnt
mount: block device /tmp/a.udf is write-protected, mounting read-only
#Check the extended the attribute after mount the image file. But we got nothing.
root@Ubuntu:x86_64-linux-gcc# getfattr -d -m .* /mnt/100M-file
root@Ubuntu:x86_64-linux-gcc#