[PATCH v2 0/5] Allow for quick removing of btrfs signature from block device

[PATCH v2 0/5] Allow for quick removing of btrfs signature from block device

[Hubert Kario]

If there is a btrfs created on a raw block device (raw disk) and later there
are created partitions and btrfs file systems created on partitions, subsequent
`btrfs device scan` won't remove the btrfs signature from the raw block device.

This patch series adds `btrfs device zero super <dev>` command to remove the
btrfs signature from the device as well as fix few minor problems in
btrfs_prepare_device function.

This obsoletes my previous patch "btrfs: add command to zero out superblock".

V1->V2 changes: better error reporting when there are problems with only one
of the devices passed as parameters.

Hubert Kario (5):
  btrfs: add command to zero out superblock
  handle null pointers in btrfs_prepare_device
  Remove unused option in btrfs_prepare_device
  better error handling in btrfs_prepare_device()
  btrfs: remove unused variables

 btrfs-vol.c    |    2 +-
 cmds-device.c  |   45 ++++++++++++++++++++++++++++++++++++++++++++-
 man/btrfs.8.in |    7 +++++++
 mkfs.c         |   12 ++++++------
 utils.c        |   41 ++++++++++++++++++++++++-----------------
 utils.h        |    4 ++--
 6 files changed, 84 insertions(+), 27 deletions(-)

-- 
1.7.10

Re: [PATCH v2 0/5] Allow for quick removing of btrfs signature from block device

[Tomasz Torcz]

On Tue, May 01, 2012 at 02:38:01PM +0200, Hubert Kario wrote:
> This patch series adds `btrfs device zero super <dev>` command to rem=
ove the
> btrfs signature from the device as well as fix few minor problems in
> btrfs_prepare_device function.

  Shouldn't you rather extend =E2=80=9Cwipefs=E2=80=9D from util-linux?

--=20
Tomasz Torcz                                                       72->=
|   80->|
xmpp: zdzichubg@chrome.pl                                          72->=
|   80->|

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Re: [PATCH v2 0/5] Allow for quick removing of btrfs signature from block device

[Hubert Kario]

On Tuesday 01 of May 2012 14:43:37 Tomasz Torcz wrote:
> On Tue, May 01, 2012 at 02:38:01PM +0200, Hubert Kario wrote:
> > This patch series adds `btrfs device zero super <dev>` command to r=
emove
> > the btrfs signature from the device as well as fix few minor proble=
ms in
> > btrfs_prepare_device function.
>=20
>   Shouldn't you rather extend =E2=80=9Cwipefs=E2=80=9D from util-linu=
x?

wipefs v.2.21.1 does detect btrfs so there's no need to.

I'd guess that most people will be thinking about btrfs RAID management=
 in LVM=20
or MD terms, so the zero-superblock option should be available in the b=
trfs=20
tool proper (as similar option is avaiable in mdadm).

Adding it is trivial (look at my V1 patch) and does not introduce speci=
al=20
code.

What's more, wipefs demages only the first superblock (so the fs is sti=
ll=20
mountable using btrfs-select-super -s 1 <dev>), while btrfs device zero=
-
superblock removes all superblocks.

Regards,
--=20
Hubert Kario
QBS - Quality Business Software
02-656 Warszawa, ul. Ksawer=C3=B3w 30/85
tel. +48 (22) 646-61-51, 646-74-24
www.qbs.com.pl
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