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Date:   Wed, 18 May 2022 12:12:41 -0700
From:   Marc MERLIN <marc@merlins.org>
To:     Josef Bacik <josef@toxicpanda.com>
Cc:     linux-btrfs <linux-btrfs@vger.kernel.org>
Subject: Re: Rebuilding 24TB Raid5 array (was btrfs corruption: parent
 transid verify failed + open_ctree failed)
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On Wed, May 18, 2022 at 02:26:36PM -0400, Josef Bacik wrote:
> Hrm crud, I've fixed this, but you may have to re-run the init's.  Start with
> 
> btrfs check --repair <device>
> 
> and then see if it works.  If not do
 
Block group[15360476577792, 1073741824] (flags = 1) didn't find the relative chunk.
Block group[15361550319616, 1073741824] (flags = 1) didn't find the relative chunk.
Block group[15362624061440, 1073741824] (flags = 1) didn't find the relative chunk.
Block group[15363697803264, 1073741824] (flags = 1) didn't find the relative chunk.
Block group[15364771545088, 1073741824] (flags = 1) didn't find the relative chunk.
Block group[15365845286912, 1073741824] (flags = 1) didn't find the relative chunk.
Block group[15366919028736, 1073741824] (flags = 1) didn't find the relative chunk.
failed to repair damaged filesystem, aborting

Starting repair.
Opening filesystem to check...
JOSEF: root 9
Checking filesystem on /dev/mapper/dshelf1
UUID: 96539b8c-ccc9-47bf-9e6c-29305890941e

> btrfs rescue init-extent-tree <device>

Whatever we did may have caused a bunch of new files to be invalid and have to be deleted.

searching 159785 for bad extents
processed 11304960 of 108429312 possible bytes, 10%
Found an extent we don't have a block group for in the file
file
Deleting [11142, 108, 1020231680] root 6781246029824 path top 6781246029824 top slot 2 leaf 3861741830144 slot 109

searching 159785 for bad extents
processed 11304960 of 108429312 possible bytes, 10%
Found an extent we don't have a block group for in the file
file
Deleting [11142, 108, 1020280832] root 6781246046208 path top 6781246046208 top slot 2 leaf 3861741846528 slot 109

searching 159785 for bad extents
processed 11304960 of 108429312 possible bytes, 10%
Found an extent we don't have a block group for in the file
file
Deleting [11142, 108, 1154498560] root 6781246029824 path top 6781246029824 top slot 2 leaf 3861741830144 slot 109

searching 159785 for bad extents
processed 11304960 of 108429312 possible bytes, 10%
Found an extent we don't have a block group for in the file
file
Deleting [11142, 108, 1288716288] root 6781246046208 path top 6781246046208 top slot 2 leaf 3861741846528 slot 10

Mmmh, it's deleted 2500 files already, I just stopped it
gargamel:~# grep -c Deleting /mnt/btrfs_space/ri1
2507

Safe to continue?

> btrfs rescue init-csum-tree <device>
> btrfs check <device>

-- 
"A mouse is a device used to point at the xterm you want to type in" - A.S.R.
 
Home page: http://marc.merlins.org/                       | PGP 7F55D5F27AAF9D08