From: Marc MERLIN <marc@merlins.org>
To: Qu Wenruo <quwenruo@cn.fujitsu.com>
Cc: linux-btrfs@vger.kernel.org
Subject: Re: btrfs check --repair: ERROR: cannot read chunk root
Date: Sun, 30 Oct 2016 23:25:09 -0700 [thread overview]
Message-ID: <20161031062509.GO28648@merlins.org> (raw)
In-Reply-To: <b31eaf2d-b339-6163-0108-28d1586c05e5@cn.fujitsu.com>
On Mon, Oct 31, 2016 at 02:04:10PM +0800, Qu Wenruo wrote:
> >Sorry for asking, am I doing this wrong?
> >myth:~# dd if=/dev/mapper/crypt_bcache0 of=/tmp/dump1 bs=512 count=32
> >skip=26367830208
> >dd: reading `/dev/mapper/crypt_bcache0': Invalid argument
> >0+0 records in
> >0+0 records out
> >0 bytes (0 B) copied, 0.000401393 s, 0.0 kB/s
>
> So, the underlying MD RAID5 are complaining about some wrong data, and
> refuse to read out.
>
> It seems that btrfs-progs can't handle read failure?
> Maybe dm-error could emulate it.
>
> And what about the 2nd range?
they both fail the same, but I wasn' tsure if I typed the wrong dd command
or not.
myth:~# btrfs fi df /mnt/mnt
Data, single: total=13.22TiB, used=13.19TiB
System, DUP: total=32.00MiB, used=1.42MiB
Metadata, DUP: total=74.00GiB, used=72.82GiB
GlobalReserve, single: total=512.00MiB, used=0.00B
myth:~# btrfs fi show
Label: 'DS5' uuid: 6692cf4c-93d9-438c-ac30-5db6381dc4f2
Total devices 1 FS bytes used 13.26TiB
devid 1 size 14.55TiB used 13.36TiB path /dev/mapper/crypt_bcache0
For now, I mounted the filesystem and I'm running scrub on it to see how
much damage there is. It will take all night:
BTRFS warning (device dm-0): checksum error at logical 27886878720 on dev /dev/mapper/crypt_bcache0, sector 56580096, root 9461, inode 45837, offset 15460089856, length 4096, links 1 (path: system/mlocate/mlocate.db)
BTRFS error (device dm-0): bdev /dev/mapper/crypt_bcache0 errs: wr 0, rd 0, flush 0, corrupt 1, gen 0
BTRFS error (device dm-0): unable to fixup (regular) error at logical 27887009792 on dev /dev/mapper/crypt_bcache0
BTRFS error (device dm-0): bdev /dev/mapper/crypt_bcache0 errs: wr 0, rd 0, flush 0, corrupt 2, gen 0
BTRFS error (device dm-0): unable to fixup (regular) error at logical 27886878720 on dev /dev/mapper/crypt_bcache0
BTRFS warning (device dm-0): checksum error at logical 27885961216 on dev /dev/mapper/crypt_bcache0, sector 56578304, root 9461, inode 45837, offset 15459172352, length 4096, links 1 (path: system/mlocate/mlocate.db)
BTRFS warning (device dm-0): checksum error at logical 27885830144 on dev /dev/mapper/crypt_bcache0, sector 56578048, root 9461, inode 45837, offset 15459041280, length 4096, links 1 (path: system/mlocate/mlocate.db)
BTRFS error (device dm-0): bdev /dev/mapper/crypt_bcache0 errs: wr 0, rd 0, flush 0, corrupt 3, gen 0
BTRFS error (device dm-0): unable to fixup (regular) error at logical 27885830144 on dev /dev/mapper/crypt_bcache0
BTRFS error (device dm-0): bdev /dev/mapper/crypt_bcache0 errs: wr 0, rd 0, flush 0, corrupt 4, gen 0
BTRFS error (device dm-0): unable to fixup (regular) error at logical 27885961216 on dev /dev/mapper/crypt_bcache0
BTRFS warning (device dm-0): checksum error at logical 27887013888 on dev /dev/mapper/crypt_bcache0, sector 56580360, root 9461, inode 45837, offset 15460225024, length 4096, links 1 (path: system/mlocate/mlocate.db)
BTRFS error (device dm-0): bdev /dev/mapper/crypt_bcache0 errs: wr 0, rd 0, flush 0, corrupt 5, gen 0
BTRFS error (device dm-0): unable to fixup (regular) error at logical 27887013888 on dev /dev/mapper/crypt_bcache0
BTRFS warning (device dm-0): checksum error at logical 27885834240 on dev /dev/mapper/crypt_bcache0, sector 56578056, root 9461, inode 45837, offset 15459045376, length 4096, links 1 (path: system/mlocate/mlocate.db)
BTRFS error (device dm-0): bdev /dev/mapper/crypt_bcache0 errs: wr 0, rd 0, flush 0, corrupt 6, gen 0
BTRFS error (device dm-0): unable to fixup (regular) error at logical 27885834240 on dev /dev/mapper/crypt_bcache0
BTRFS warning (device dm-0): checksum error at logical 27887017984 on dev /dev/mapper/crypt_bcache0, sector 56580368, root 9461, inode 45837, offset 15460229120, length 4096, links 1 (path: system/mlocate/mlocate.db)
BTRFS error (device dm-0): bdev /dev/mapper/crypt_bcache0 errs: wr 0, rd 0, flush 0, corrupt 7, gen 0
BTRFS error (device dm-0): unable to fixup (regular) error at logical 27887017984 on dev /dev/mapper/crypt_bcache0
So far, it looks like mnior damage limited to one file, I'll see tomorrow morning after it's done reading the whole array
> And further more, all backup chunk root are in facts pointing to current
> chunk root, so --chunk-root doesn't work at all.
Ah, ok, so there is nothing I can do at the moment until I get a new btrfs-progs, correct?
Thanks for your answers
Marc
--
"A mouse is a device used to point at the xterm you want to type in" - A.S.R.
Microsoft is to operating systems ....
.... what McDonalds is to gourmet cooking
Home page: http://marc.merlins.org/
next prev parent reply other threads:[~2016-10-31 6:25 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-30 18:34 btrfs check --repair: ERROR: cannot read chunk root Marc MERLIN
2016-10-31 1:02 ` Qu Wenruo
2016-10-31 2:06 ` Marc MERLIN
2016-10-31 4:21 ` Marc MERLIN
2016-10-31 5:27 ` Qu Wenruo
2016-10-31 5:47 ` Marc MERLIN
2016-10-31 6:04 ` Qu Wenruo
2016-10-31 6:25 ` Marc MERLIN [this message]
2016-10-31 6:32 ` Qu Wenruo
2016-10-31 6:37 ` Marc MERLIN
2016-10-31 7:04 ` Qu Wenruo
2016-10-31 8:44 ` Hugo Mills
2016-10-31 15:04 ` Marc MERLIN
2016-11-01 3:48 ` Marc MERLIN
2016-11-01 4:13 ` Qu Wenruo
2016-11-01 4:21 ` Marc MERLIN
2016-11-04 8:01 ` Marc MERLIN
2016-11-04 9:00 ` Roman Mamedov
2016-11-04 17:59 ` Marc MERLIN
2016-11-07 1:11 ` Qu Wenruo
[not found] ` <87lgwwnnyf.fsf@notabene.neil.brown.name>
2016-11-07 1:20 ` clearing blocks wrongfully marked as bad if --update=no-bbl can't be used? Marc MERLIN
2016-11-07 1:39 ` Qu Wenruo
2016-11-07 4:18 ` Qu Wenruo
2016-11-07 5:36 ` btrfs support for filesystems >8TB on 32bit architectures Marc MERLIN
2016-11-07 6:16 ` Qu Wenruo
2016-11-07 14:55 ` Marc MERLIN
2016-11-08 0:35 ` Qu Wenruo
2016-11-08 0:39 ` Marc MERLIN
2016-11-08 0:43 ` Qu Wenruo
2016-11-08 1:06 ` Marc MERLIN
2016-11-08 1:17 ` Qu Wenruo
2016-11-08 15:24 ` Marc MERLIN
2016-11-09 1:50 ` Qu Wenruo
2016-11-09 2:05 ` Marc MERLIN
2016-11-11 3:48 ` Marc MERLIN
2016-11-11 3:55 ` Qu Wenruo
2016-11-12 3:17 ` when btrfs scrub reports errors and btrfs check --repair does not Marc MERLIN
2016-11-13 15:06 ` Marc MERLIN
2016-11-13 15:13 ` Roman Mamedov
2016-11-13 15:52 ` Marc MERLIN
-- strict thread matches above, loose matches on Subject: below --
2016-10-31 1:29 btrfs check --repair: ERROR: cannot read chunk root Janos Toth F.
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