From: "David C. Partridge" <david.partridge@perdrix.co.uk>
To: <linux-btrfs@vger.kernel.org>
Subject: RE: Problems with btrfs
Date: Sat, 28 Apr 2018 15:06:49 +0100 [thread overview]
Message-ID: <006201d3defa$2783dda0$768b98e0$@perdrix.co.uk> (raw)
In-Reply-To: <60674123-6fe2-2cfe-e7a8-25d62e023c53@gmx.com>
[-- Attachment #1: Type: text/plain, Size: 2957 bytes --]
Here's the log you asked for ...
David
-----Original Message-----
From: Qu Wenruo [mailto:quwenruo.btrfs@gmx.com]
Sent: 28 April 2018 14:54
To: David C. Partridge
Subject: Re: Problems with btrfs
On 2018年04月28日 21:38, David C. Partridge wrote:
> Oh! doing a private build from source a bit beyond my skill level :( Are there alternatives like climbing in with a disk editor or is there too much to change?
It's possible to only modify that offending tree block.
But I can't ensure the safety, thus I recommend to use btrfs-corrupt-block.
Since it's not convenient for you, then let's go that way.
Please provide the following dump:
# btrfs inspect dump-tree -t chunk <device>
Then I could calculate the offset on-disk for you to do a binary dump and send that tree block back to me to hand patch it.
>
> I'm prepared to install a newer version of btrfs-progs if that will fix the problem (assuming I can find a suitable package file).
>
> I'm assuming that I'll likely also need to update the kernel?
Not exactly.
If latest btrfs check gives no error after fix, even old kernel should handle it well without problem.
But as a generic advice, it's recommended to use latest kernel for btrfs if possible.
And currently there is nothing sensitive in the thread (btrfs-inspect.log could contain some filenames, but nothing sensitive right now), so it's better to CC the mail to mail list, just in case some other guy could provide extra help.
(Next mail may be after 8~10 hours, as it's bed time for my timezone)
Thanks,
Qu
>
> David
>
> -----Original Message-----
> From: Qu Wenruo [mailto:quwenruo.btrfs@gmx.com]
> Sent: 28 April 2018 14:25
> To: David C. Partridge
> Subject: Re: Problems with btrfs
>
>
>
> On 2018年04月28日 21:14, David C. Partridge wrote:
>> Here's the output from
>>
>> # btrfs inspect dump-tree /dev/mapper/Charon--vg-root | grep -C 20
>> 224304857088
>
> Located the problem:
>
> item 382 key (224304857088 EXTENT_ITEM 16384) itemoff 14495 itemsize 51
> extent refs 1 gen 735989 flags TREE_BLOCK
> tree block key (4401028 UNKNOWN.0 0) level 0
> ^^^^^^^^^^^^^^^^^^^
> shared block backref parent 140827475968
>
> It could be fixed by special crafted btrfs-corrupt-block tool to handle it.
> Although this means you need to compile btrfs-progs by yourself with special branch.
>
> Before patching btrfs-progs, I'd like to double check if other part is correct.
>
> Please execute the following command:
> # btrfs inspect dump-tree -b 140827475968 /dev/mapper/Charon--vg-root
>
> If the output is correct, I could start patching btrfs-corrupt-block then.
> But please be aware of that, this could only fix the problem found in extent tree, I'm not 100% sure if there will be other problems, as the btrfs-progs is pretty old.
>
> Thanks,
> Qu
>
>>
>> HtH
>> David
>>
>
[-- Attachment #2: btrfs-dump-chunk.log --]
[-- Type: application/octet-stream, Size: 17979 bytes --]
btrfs-progs v4.7.3
chunk tree
leaf 302570274816 items 68 free space 8933 generation 849190 owner 3
fs uuid a0a6c5a6-061f-4c86-bc14-7f9abf3cb57e
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next prev parent reply other threads:[~2018-04-28 14:14 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-27 18:38 Problems with btrfs David C. Partridge
2018-04-28 0:20 ` Qu Wenruo
2018-04-28 3:09 ` Chris Murphy
[not found] ` <003801d3def2$d90965c0$8b1c3140$@perdrix.co.uk>
[not found] ` <a5c24cee-ad20-f317-28e8-40e88039db45@gmx.com>
[not found] ` <004d01d3def6$4000ed40$c002c7c0$@perdrix.co.uk>
[not found] ` <60674123-6fe2-2cfe-e7a8-25d62e023c53@gmx.com>
2018-04-28 14:06 ` David C. Partridge [this message]
2018-04-28 14:23 ` Qu Wenruo
2018-04-28 16:02 ` David C. Partridge
2018-04-29 1:35 ` Qu Wenruo
[not found] ` <002f01d3df5d$25dd0270$71970750$@perdrix.co.uk>
2018-04-29 2:07 ` Qu Wenruo
[not found] ` <002a01d3df93$74b7b760$5e272620$@perdrix.co.uk>
[not found] ` <126b8a98-384e-af68-8a36-ad702f07fad2@gmx.com>
2018-04-29 9:20 ` David C. Partridge
2018-04-29 9:36 ` Qu Wenruo
2018-04-29 9:55 ` David C. Partridge
2018-04-29 10:00 ` Qu Wenruo
[not found] ` <003501d3dfa0$ce3f1b40$6abd51c0$@perdrix.co.uk>
2018-04-29 10:15 ` Qu Wenruo
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