hi,
i'm using Btrfs as a root partition. an hour ago i had a power failure
and the root btrfs would only mount ro. find below links to the relevant
btrfs-image, dmesg and kernel config.
used kernel when power failed: 3.9.0-1-desktop (from openSuse)
however following output from kernel: 3.10-rc4 (vanilla from kernel.org,
config see below)
btrfs mkfs was: mkfs.brtfs -d raid1 -m raid1 /dev/sda7 /dev/sdb1
mounting with recovery didn't help. btrfsck failed, too (standard from
opensuse and dangerdonteveruse). it outputted (forgot to write down the
numbers, sorry):
> warning, start mismatch %uul %uul
> Aborted.
i had a quick look into the source code (branch dangerdonteveruse) and
found the Abort came from:
> static int add_data_backref
> (...)
> if (rec->start != bytenr)
> abort();
since my backup was just 3h old, for the heck of it i also tried
btrfs-zero-log and btrfs-select-super without success. both even
reported "failed to open_ctree"
links (config, btrfs-image, dmesg)
http://www.ifyouwantblood.de/temp/btrfs-2013-06-22-config
http://www.ifyouwantblood.de/temp/btrfs-2013-06-22-sdb1
http://www.ifyouwantblood.de/temp/btrfs-2013-06-22-dmesg
3.9.0-1-desktop
http://kernel.opensuse.org/cgit/kernel-source/commit/?id=97c14baeec524b749710c3a0dd18f9223ea55933
the relevant messages, i believe, are:
-------------------------------------------------------------
BTRFS error (device sda7): unable to find ref byte nr 2249924608 parent
0 root 261 owner 13065 offset 5525504
BTRFS error (device sda7): trying to drop 3 refs but we only have 1 for
bytenr 2249924608
BTRFS error (device sda7) in __btrfs_free_extent:5566: errno=-22 unknown
BTRFS info (device sda7): forced readonly
BTRFS debug (device sda7): run_one_delayed_ref returned -22
BTRFS error (device sda7) in btrfs_run_delayed_refs:2630: errno=-22 unknown
BTRFS error (device sda7): Error removing orphan entry, stopping orphan
cleanup
BTRFS critical (device sda7): could not do orphan cleanup -22
------------[ cut here ]------------
-------------------------------------------------------------
(see links above for full dmesg)
--
MFG Sebastian
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