I noticed test generic/645 is skipped on cifs.ko due to "src/vfs/vfstest --idmapped-mounts-supported ..." returning an error for generic/645 casuing [not run] vfstest not support by cifs Any ideas on what it takes for a filesystem to support idmapped mounts (in this case cifs.ko)? I see places in src/vfs/vfstest.c where it is checking for MOUNT_ATTR_IDMAP but I don't see filesystems checking this. Is there any more info on which filesystems support idmapping and examples to look at to make sure we are supporting it properly? -- Thanks, Steve