Re: [PATCH v2 01/10] vfs: move cap_convert_nscap() call into vfs_setxattr()

On Tue, Jan 12, 2021 at 10:43 AM Miklos Szeredi [off-list ref] wrote:

The following semantics would make a ton more sense, since getting a
v2 would indicate that rootid is unknown:

- if cap is v2 convert to v3 with zero rootid
- after this, check if rootid needs to be translated, if not return v3
- if yes, try to translate to current ns, if succeeds return translated v3
- if not mappable, return v2

Hmm?

Actually, it would make even more sense to simply skip unconvertible
caps and return -ENODATA.  In fact that's what I thought would happen
until I looked at the -EOPNOTSUPP fallback code in vfs_getxattr().

Serge, do you remember what was the reason for the unconverted fallback?

Thanks,
Miklos