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Re: BTRFS file clone support for cp
From: |
Pádraig Brady |
Subject: |
Re: BTRFS file clone support for cp |
Date: |
Fri, 31 Jul 2009 00:28:49 +0100 |
User-agent: |
Thunderbird 2.0.0.6 (X11/20071008) |
Joel Becker wrote:
> In some sense, using btrfs, nilfs2i, ocfs2 with refcount trees
> enabled, or any other CoW-ish filesystem is a tacit approval of the
> delayed ENOSPC. The same can be said of "thin provisioning" LUNs.
> However, the other concerns are still valid. A user invoking vanilla
> cp(1) expects two independent storage regions for the data.
> (Oh, and what about future support of de-duping in filesystems?
> :-)
I maintain an app to de-dupe at http://www.pixelbeat.org/fslint/
and I'll be adding reflink support as soon as it becomes available.
>From a filesystem point of view, one thing that would help speed
this up (and many other things like rsync etc.) would be to allow
one to associate say a sha-3 hash or whatever with the file, which
the filesystem would automatically clear when the file data changes.
So in general having a special set of extended attributes that
were auto cleared on file modification would be very useful for
lots of stuff.
cheers,
Pádraig.
- Re: BTRFS file clone support for cp, (continued)
- Re: BTRFS file clone support for cp, Jim Meyering, 2009/07/30
- Re: BTRFS file clone support for cp, Joel Becker, 2009/07/30
- Re: BTRFS file clone support for cp, Pádraig Brady, 2009/07/30
- Re: BTRFS file clone support for cp, Ric Wheeler, 2009/07/30
- Re: BTRFS file clone support for cp, Jim Meyering, 2009/07/30
- Re: BTRFS file clone support for cp, Andi Kleen, 2009/07/30
- Re: BTRFS file clone support for cp, Pádraig Brady, 2009/07/30
- Re: BTRFS file clone support for cp, Jim Meyering, 2009/07/30
- Re: BTRFS file clone support for cp, Andi Kleen, 2009/07/30
- Re: BTRFS file clone support for cp, Joel Becker, 2009/07/30
- Re: BTRFS file clone support for cp,
Pádraig Brady <=
- Re: BTRFS file clone support for cp, Tomasz Chmielewski, 2009/07/30
- Re: BTRFS file clone support for cp, Chris Mason, 2009/07/29
- Re: BTRFS file clone support for cp, Giuseppe Scrivano, 2009/07/29
- Re: BTRFS file clone support for cp, Pádraig Brady, 2009/07/29
- Re: BTRFS file clone support for cp, Giuseppe Scrivano, 2009/07/30
- Re: BTRFS file clone support for cp, Pádraig Brady, 2009/07/30
- Re: BTRFS file clone support for cp, Giuseppe Scrivano, 2009/07/31
- Re: BTRFS file clone support for cp, Pádraig Brady, 2009/07/31
- Re: BTRFS file clone support for cp, Jim Meyering, 2009/07/31
- Re: BTRFS file clone support for cp, Jim Meyering, 2009/07/30