From: Pietro Gagliardi <pietro10@mac.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@cse.psu.edu>
Subject: Re: [9fans] Corrupted file entry on QEMU - how to recover?
Date: Sat, 29 Dec 2007 11:33:56 -0500 [thread overview]
Message-ID: <4584997B-ED8E-4B07-99DC-3E14CB93D909@mac.com> (raw)
In-Reply-To: <20071227212323.DDA581E8C1C@holo.morphisms.net>
OK, I'm going to hold this off for the new year. Until then, I
managed to free up a lot of space (and am continuing to do so), so
this time I'll put up a new 4GB QEMU fossil+venti Plan 9 and save the
old disk until I can fix it.
On Dec 27, 2007, at 11:23 AM, Russ Cox wrote:
>> Can someone PLEASE give me some information so I can get my files
>> back? Otherwise, there goes my 3D library, my hoc implementation,
>> etc.
>
> I'm afraid you're probably out of luck, without a lot of work.
>
> The disk data structures are all described in /sys/doc/fossil.ps.
>
> If you were using snapshots, then you might be able to
> use the information in /sys/doc/fossil.ps to write a program
> to find all the fossil snapshot roots, and then you
> could rewrite the super block to point at an older,
> hopefully not corrupt, root.
>
> However, it looks like in plain fossil mode (not fossil+venti),
> the installer does not configure any snapshots, so you'd
> have had to turn them on yourself.
>
> Without snapshots, you'd have to poke around on the
> disk looking for a VtSource that looked like the root
> directory and then fix up the root block to be valid and
> point at it.
>
> If you're not used to poking at file system data structures,
> this might well be more work than just recreating your
> hoc and 3D code.
>
> Russ
>
next prev parent reply other threads:[~2007-12-29 16:33 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-16 2:48 Pietro Gagliardi
2007-12-16 9:10 ` Skip Tavakkolian
2007-12-16 14:22 ` Pietro Gagliardi
2007-12-16 16:25 ` erik quanstrom
2007-12-16 16:54 ` Pietro Gagliardi
2007-12-16 17:25 ` erik quanstrom
2007-12-16 23:57 ` Pietro Gagliardi
2007-12-17 1:34 ` Pietro Gagliardi
2007-12-17 1:36 ` Pietro Gagliardi
2007-12-17 1:42 ` erik quanstrom
2007-12-17 1:57 ` Pietro Gagliardi
2007-12-17 19:24 ` john
2007-12-17 21:10 ` Pietro Gagliardi
2007-12-18 18:13 ` erik quanstrom
2007-12-18 18:19 ` erik quanstrom
2007-12-19 21:02 ` Pietro Gagliardi
2007-12-20 1:15 ` Juan M. Mendez
2007-12-20 1:52 ` Pietro Gagliardi
2007-12-20 2:02 ` erik quanstrom
2007-12-20 2:10 ` Pietro Gagliardi
2007-12-20 19:58 ` Pietro Gagliardi
2007-12-22 22:29 ` Pietro Gagliardi
2007-12-23 2:35 ` Bakul Shah
2007-12-27 16:23 ` Russ Cox
2007-12-29 16:33 ` Pietro Gagliardi [this message]
2007-12-29 19:06 ` Pietro Gagliardi
2008-01-01 1:37 ` Pietro Gagliardi
2008-01-11 20:01 ` Pietro Gagliardi
2008-01-11 20:47 ` Pietro Gagliardi
2008-01-11 22:29 ` Pietro Gagliardi
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