* Re: Snapshot cannot be deleted
[not found] <CAKVY-+9cjRKfXFVVEamtNVLaWE1+jc44M4kyrJOOk915v2fxtA@mail.gmail.com>
2015-01-20 17:13 ` Snapshot cannot be deleted Theodore Ts'o
@ 2015-01-21 12:26 ` Filipe David Manana
1 sibling, 0 replies; 2+ messages in thread
From: Filipe David Manana @ 2015-01-21 12:26 UTC (permalink / raw)
To: Andreas Philipp; +Cc: linux-btrfs@vger.kernel.org
On Tue, Jan 20, 2015 at 12:28 PM, Andreas Philipp
<philipp.andreas@gmail.com> wrote:
> Hi,
>
> Due to the known (and fixed) bug in kernel 3.17.0 one of my btrfs
> volume suffers from unreadable and - even worse - uneraseable
> snapshots. Whenever such a snapshot is accessed there is "parent
> transid verify failed" in dmesg.
> Is there any way to delete these snapshots?
It can be fixed with btrfs-progs v3.17 and later (3.18.x is the latest release).
To confirm that you are affected by the 3.17 kernel issue, run btrfsck
in readonly mode first (without --repair or any other flags), which
will print one message with the following format for each corrupt
snapshot:
"root %llu has a root item with a more recent gen (%llu) compared to
the found root node (%llu)\n"
Any other error messages are likely unrelated and therefore associated
with other eventual issues.
As usual, before running btrfsck with --repair (which fixes the issue
and the snapshots will be fully repaired), create backups of your
data.
Hope it helps.
>
> Thanks,
> Andreas
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--
Filipe David Manana,
"Reasonable men adapt themselves to the world.
Unreasonable men adapt the world to themselves.
That's why all progress depends on unreasonable men."
^ permalink raw reply [flat|nested] 2+ messages in thread