Re: [PATCH] Subvolume listing feature for ioctl.

[Josef Bacik <josef@redhat.com>]

On Wed, Nov 18, 2009 at 02:42:14PM +0900, TARUISI Hiroaki wrote:
> New feature to list up subvolume/snapshots under
> specified tree of file is introduced to ioctl.
> 
> Signed-off-by: TARUISI Hiroaki <taruishi.hiroak@jp.fujitsu.com>
> ---
>  fs/btrfs/ioctl.c |  283 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  fs/btrfs/ioctl.h |   29 +++++
>  2 files changed, 312 insertions(+)
> 

I've been using this patch to work with my subvolume mounting patches, and it
seems to have a problem where it will panic the box.  At first I thought it was
something that I did, but on a freshly mkfs'ed fs I can reproduce the panic
without doing any of the subvolume mounting weirdness.  If I do btrfsctl -l a
couple of times it will panic.  This most recent time I did a btrfsctl -l on an
empty fs, created a subvolume, did a list again, created another subvolume, and
tried to list again and the box paniced.  I don't have time to look into this
now, but I will look into it next week if you haven't had a chance to get to it
before then.  Thanks,

Josef