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Date:   Tue, 12 Jan 2021 11:04:46 +0100
From:   Miklos Szeredi <>
To:     "Eric W. Biederman" <>
Cc:     Miklos Szeredi <>,,
        overlayfs <>,
        LSM <>,, "Serge E. Hallyn" <>
Subject: 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 <> 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?


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