linux-ext4 - Re: Run mkfs.ext4 on an already existing ext4 filesystem. Seeking professional help or programming hints for the recovery.

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Message-ID: <CABxFBzE6u4o-0DDHEpKQftgMB0g5AZcjER+PdNBb5M3U7BHaWQ@mail.gmail.com>
Date:   Thu, 11 Apr 2019 11:57:54 +0200
From:   Andrea Lo Pumo <alopumo@...ia.biz>
To:     unlisted-recipients:; (no To-header on input)
Cc:     linux-ext4@...r.kernel.org
Subject: Re: Run mkfs.ext4 on an already existing ext4 filesystem. Seeking
 professional help or programming hints for the recovery.

To clarify, the commands run on the machine were:

   cryptsetup luksOpen /dev/sda1 secure_storage
   mkfs.ext4 /dev/mapper/secure_storage  <--- this messed everything

Through the emails I used "/dev/sda1" to make the story simpler, as I
believe that /dev/mapper/secure_storage is the same as a normal
partition.

Thank you again.

Il giorno gio 11 apr 2019 alle ore 11:45 Andrea Lo Pumo
<alopumo@...ia.biz> ha scritto:
>
> Il giorno gio 11 apr 2019 alle ore 11:42 Reindl Harald
> <h.reindl@...lounge.net> ha scritto:
> >
> > Am 11.04.19 um 11:37 schrieb Andrea Lo Pumo:
> > > On /dev/sda1(*) there was an ext4 file system with a lot of large
> > > files. Now, by mistake, mkfs.ext4 has been run on /dev/sda1. The
> > > result is that now /dev/sda1 is "empty": mounting it shows no files.
> > >
> > > Note *: actually, it is /dev/mapper/secure_storage, an encrypted
> > > volume opened with LUKS: cryptsetup luksOpen /dev/sda1 secure_storage
> >
> > no
> >
> > you said you had a LUKS volume on /dev/sda1 which means by directly
> > create a fs on /dev/sda1 you have overwritten parts of the encryption
> > layer *and* at the same time the filesystem *on top* of it
>
> Sorry, I explained it badly. The commands were:
>
>   cryptsetup luksOpen /dev/sda1 secure_storage
>   mkfs.ext4 /dev/mapper/secure_storage