From: Hugo Mills <hugo-lkml@carfax.org.uk>
To: Kay Sievers <kay.sievers@vrfy.org>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>,
linux-kernel@vger.kernel.org, lennart@poettering.net,
harald@redhat.com, david@fubar.dk, greg@kroah.com,
Chris Mason <chris.mason@oracle.com>,
Btrfs mailing list <linux-btrfs@vger.kernel.org>
Subject: Re: A Plumber’s Wish List for Linux
Date: Fri, 7 Oct 2011 16:21:37 +0100 [thread overview]
Message-ID: <20111007152137.GE28351@carfax.org.uk> (raw)
In-Reply-To: <CAPXgP11K4_eVn4_emEYVzCVUsm-BXDyStk7DnDmFpMTL=404Gg@mail.gmail.com>
[-- Attachment #1: Type: text/plain, Size: 1755 bytes --]
On Fri, Oct 07, 2011 at 02:46:23PM +0200, Kay Sievers wrote:
> On Fri, Oct 7, 2011 at 12:38, Alan Cox <alan@lxorguk.ukuu.org.uk> wrote:
> > On Fri, 7 Oct 2011 12:28:46 +0200 Kay Sievers <kay.sievers@vrfy.org> wrote:
> >
> >> What do you mean would be ugly?
> >
> > I have an ext4fs. It supports every possible file name allowed by POSIX
> > and SuS. What name are you going to use for your 'hidden directory' that
> > won't clash with a real file ?
>
> Ah, no. The label on FAT (similar on NTFS) are 'magic entries' in the
> root dir list, not a real file in the root dir.
>
> We need kernel support for changing a mounted fs, because, unlike
> ext4, the blocks containing the strings are inside the fs, which the
> kernel might change any time.
It's worth noting that there are similar issues with btrfs around
changing label. A common API for it would make sense. The only btrfs
patches I've seen to change label after mkfs-time work either as:
* unmounted only, single underlying device only, pure userspace
implementation
* mounted only, multiple underlying devices, kernel support needed
The kernel-side patches never got integrated, so we're still unable
to change the label on the majority of btrfs filesystems.
Changing the UUID for the filesystem is even harder, as I think
it's written to every metadata block. I'm not sure we can do that
sanely on a mounted filesystem.
Hugo (just a spear-carrier from the btrfs chorus).
--
=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
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--- Anyone using a computer to generate random numbers is, of ---
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next prev parent reply other threads:[~2011-10-07 15:22 UTC|newest]
Thread overview: 80+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-06 23:17 Kay Sievers
2011-10-06 23:46 ` Andi Kleen
2011-10-07 0:13 ` Lennart Poettering
2011-10-07 1:57 ` Andi Kleen
2011-10-07 15:58 ` Lennart Poettering
2011-10-19 23:16 ` H. Peter Anvin
2011-10-07 7:49 ` Matt Helsley
2011-10-07 16:01 ` Lennart Poettering
2011-10-08 4:24 ` Eric W. Biederman
2011-10-10 16:31 ` Lennart Poettering
2011-10-10 20:59 ` Detecting if you are running in a container Eric W. Biederman
2011-10-10 21:41 ` Lennart Poettering
2011-10-11 5:40 ` Eric W. Biederman
2011-10-11 6:54 ` Eric W. Biederman
2011-10-12 16:59 ` Kay Sievers
2011-11-01 22:05 ` [lxc-devel] " Michael Tokarev
2011-11-01 23:51 ` Eric W. Biederman
2011-11-02 8:08 ` Michael Tokarev
2011-10-11 1:32 ` Ted Ts'o
2011-10-11 2:05 ` Matt Helsley
2011-10-11 3:25 ` Ted Ts'o
2011-10-11 6:42 ` Eric W. Biederman
2011-10-11 12:53 ` Theodore Tso
2011-10-11 21:16 ` Eric W. Biederman
2011-10-11 22:30 ` david
2011-10-12 4:26 ` Eric W. Biederman
2011-10-12 5:10 ` david
2011-10-12 15:08 ` Serge E. Hallyn
2011-10-12 17:57 ` J. Bruce Fields
2011-10-12 18:25 ` Kyle Moffett
2011-10-12 19:04 ` J. Bruce Fields
2011-10-12 19:12 ` Kyle Moffett
2011-10-14 15:54 ` Ted Ts'o
2011-10-14 18:04 ` Eric W. Biederman
2011-10-14 21:58 ` H. Peter Anvin
2011-10-16 9:42 ` Eric W. Biederman
2011-10-30 20:11 ` H. Peter Anvin
2011-11-01 13:38 ` Eric W. Biederman
2011-10-11 22:25 ` david
2011-10-07 10:12 ` A Plumber’s Wish List for Linux Alan Cox
2011-10-07 10:28 ` Kay Sievers
2011-10-07 10:38 ` Alan Cox
2011-10-07 12:46 ` Kay Sievers
2011-10-07 13:39 ` Theodore Tso
2011-10-07 15:21 ` Hugo Mills [this message]
2011-10-10 11:18 ` A Plumber???s " David Sterba
2011-10-10 13:09 ` Theodore Tso
2011-10-13 0:28 ` Dave Chinner
2011-10-14 15:47 ` Ted Ts'o
2011-10-11 13:14 ` Serge E. Hallyn
2011-10-11 15:49 ` Andrew G. Morgan
2011-10-12 2:31 ` Serge E. Hallyn
2011-10-12 20:51 ` Lennart Poettering
2011-10-08 9:53 ` A Plumber’s " Bastien ROUCARIES
2011-10-09 3:15 ` Alex Elsayed
2011-10-07 16:07 ` Valdis.Kletnieks
2011-10-07 12:35 ` Vivek Goyal
2011-10-07 18:59 ` Greg KH
2011-10-09 12:20 ` Kay Sievers
2011-10-09 8:45 ` Rusty Russell
2011-10-11 23:16 ` Andrew Morton
2011-10-12 0:53 ` Frederic Weisbecker
2011-10-12 0:59 ` Frederic Weisbecker
[not found] ` <20111012174014.GE6281@google.com>
2011-10-12 18:16 ` Cyrill Gorcunov
2011-10-14 15:38 ` Frederic Weisbecker
2011-10-14 16:01 ` Cyrill Gorcunov
2011-10-14 16:08 ` Cyrill Gorcunov
2011-10-14 16:19 ` Frederic Weisbecker
2011-10-19 21:19 ` Paul Menage
2011-10-19 21:12 ` Paul Menage
2011-10-19 23:03 ` Lennart Poettering
2011-10-19 23:09 ` Paul Menage
2011-10-19 23:31 ` Lennart Poettering
2011-10-22 10:21 ` Frederic Weisbecker
2011-10-22 15:28 ` Lennart Poettering
2011-10-25 5:40 ` Li Zefan
2011-10-30 17:18 ` Lennart Poettering
2011-11-01 1:27 ` Li Zefan
[not found] <CAE2SPAZci=u__d58phePCftVr_e+i+N2YU-JYjGDG_b3TmYTSQ@mail.gmail.com>
2011-10-07 13:40 ` Alan Cox
2011-10-07 14:57 ` Alexander E. Patrakov
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