A way to recover deleted files (just contents) from USF2

Brian F. Feldman green at freebsd.org
Tue Apr 20 20:09:00 PDT 2004

Kris Kennaway <kris at obsecurity.org> wrote:
> On Tue, Apr 20, 2004 at 07:47:17PM +0100, Bruce M Simpson wrote:
> > On Tue, Apr 20, 2004 at 11:57:37AM -0400, Brian F. Feldman wrote:
> > > That sounds like a cool idea.  Maybe you could write a small program to do 
> > > that and an rc.d script for it?  Simplest operation would be something like:
> > [snip]
> > 
> > I second that this also sounds like a cool idea, albeit limited on a
> > per-filesystem basis. Snapshotting all filesystems would obviously be
> > a bad idea.
> I tried this once but ran into deadlocks with the snap code.  These
> might have since been fixed.  Also, creating the snapshot was
> sometimes taking an exceedingly long time, which is bad since it locks
> out all filesystem write access while the operation is in progress.

Until just a few minutes ago I thought snapshots were perfectly stable :-/  
I have never had problems with bgfsck or dump -L but I managed to get:
panic("initiate_write_inodeblock_ufs2: already started");
while doing a "make kernel" with bgfsck going on.  The coredump lunched so
I don't have more info than that.

Brian Fundakowski Feldman                           \'[ FreeBSD ]''''''''''\
  <> green at FreeBSD.org                               \  The Power to Serve! \
 Opinions expressed are my own.                       \,,,,,,,,,,,,,,,,,,,,,,\

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