On Sun, 2024-12-01 at 14:12 +0100, Christian Brauner wrote: > Hey, > > Some filesystems like kernfs and pidfs support file handles as a > convenience to enable the use of name_to_handle_at(2) and > open_by_handle_at(2) but don't want to and cannot be reliably exported. > Add a flag that allows them to mark their export operations accordingly > and make NFS check for its presence. > > @Amir, I'll reorder the patches such that this series comes prior to the > pidfs file handle series. Doing it that way will mean that there's never > a state where pidfs supports file handles while also being exportable. > It's probably not a big deal but it's definitely cleaner. It also means > the last patch in this series to mark pidfs as non-exportable can be > dropped. Instead pidfs export operations will be marked as > non-exportable in the patch that they are added in. > > Thanks! > Christian > > --- > Christian Brauner (4): > exportfs: add flag to indicate local file handles > kernfs: restrict to local file handles > ovl: restrict to exportable file handles > pidfs: restrict to local file handles > > fs/kernfs/mount.c | 1 + > fs/nfsd/export.c | 8 +++++++- > fs/overlayfs/util.c | 7 ++++++- > fs/pidfs.c | 1 + > include/linux/exportfs.h | 1 + > 5 files changed, 16 insertions(+), 2 deletions(-) > --- > base-commit: 74e20c5946ab3f8ad959ea34f63f21e157d3ebae > change-id: 20241201-work-exportfs-cd49bee773c5 > I've been following the pidfs filehandle discussion and this is exactly what I was thinking we needed: a way to explicitly label certain fstypes as unexportable via nfsd. Reviewed-by: Jeff Layton <jlayton@xxxxxxxxxx>
