linux-kernel - Re: [PATCH 3/3] xstat: Implement a requestable extra result to procure some inode flags [ver #4]

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:	Mon, 05 Jul 2010 16:05:40 +0100
From:	David Howells <dhowells@...hat.com>
To:	Andreas Dilger <adilger@...ger.ca>
Cc:	dhowells@...hat.com, linux-fsdevel@...r.kernel.org,
	linux-cifs@...r.kernel.org, linux-kernel@...r.kernel.org,
	samba-technical@...ts.samba.org, linux-ext4@...r.kernel.org
Subject: Re: [PATCH 3/3] xstat: Implement a requestable extra result to procure some inode flags [ver #4]

Andreas Dilger <adilger@...ger.ca> wrote:

> I would say this should be a full-fledged member of struct xstat.  I think
> they are fairly standard (available on many filesystems today), and
> requiring an ioctl to access them is unpleasant.

Remember: adding them to xstat and kstat will use up three extra 64-bit words
of stack at least if ecryptfs.

Are they used often enough to justify this?

> Yuck on the names.  Why not stick with the "UF_" and "SF_" prefixes?

Firstly, this is a quick and dirty example, primarily because I'd like someone
to take a look at the mechanism.

Secondly, because the flags I've added don't have UF_ and SF_ variants within
Linux.

> Since we don't need to keep _binary_ compatibility with these flag values
> (only name portability) we can use the same flag values as the FS_*_FL
> definitions in fs.h.

No, you can't, because Linux doesn't have separate S and U variants.

However, I'd be quite happy to just use the FS_*_FL, perhaps plus a couple of
flags, and have userspace munge together the BSD-compatible st_flags.  To that
end, could we rearrange i_flags to match the ioctl?

David
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/