Hi,
I use btrfs for my /home drive. It's a separate drive with just a
single partition.
I upgraded to ubuntu 13.10 (beta) a few weeks ago, without any real
trouble. But I did have too many issues (not with the drive or btrfs,
though) so I decided to do a fresh install.
The new install failed a few times, so I made another startup usb
drive with another program and that one worked fine.
However, my /dev/sda1 was now recognised as an ext4 instea of btrfs.
It also had some files on it (a default ubuntu /home and a
/lost+found)
I can't mount the drive as type=btrfs
sudo mount -t btrfs /dev/sda1 /mnt/btrfs/
mount: wrong fs type, bad option, bad superblock on /dev/sda1,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so
sudo dmesg | grep btrfs
[ 187.604312] btrfs[2771]: segfault at ac ip 000000000042b93b sp
00007fff918332c8 error 4 in btrfs[400000+4d000]
[ 196.574435] btrfs[2777]: segfault at ac ip 000000000042b93b sp
00007fff0f04d8a8 error 4 in btrfs[400000+4d000]
[ 241.698698] btrfs[2800]: segfault at ac ip 000000000042b93b sp
00007fffb1d02b08 error 4 in btrfs[400000+4d000]
Everything I tried crashed, except for 'show'
sudo btrfs fi show
failed to open /dev/sr0: No medium found
Label: none uuid: 183af3e0-2572-4497-9705-1d27a6657f7b
Total devices 1 FS bytes used 746.23GB
devid 1 size 2.73TB used 2.73TB path /dev/sda1
Btrfs v0.20-rc1
which makes it more or less reassuring that the data is still there,
but I can't seem to find a way to get it :-(
At the moment I restored a backup, so I'm fine more or less, but it
would be nice if I could fix this.
sudo btrfs fi df /dev/sda1
ERROR: couldn't get space info on '/dev/sda1' - Inappropriate ioctl for device
sudo btrfsck /dev/sda1
Check tree block failed, want=21000192, have=0
Check tree block failed, want=21000192, have=0
Check tree block failed, want=21000192, have=0
Check tree block failed, want=21000192, have=0
Check tree block failed, want=21000192, have=0
read block failed check_tree_block
Couldn't read chunk root
sudo btrfs restore -i -v /dev/sda1 /home/geert/recover
Check tree block failed, want=21000192, have=0
Check tree block failed, want=21000192, have=0
Check tree block failed, want=21000192, have=0
Check tree block failed, want=21000192, have=0
Check tree block failed, want=21000192, have=0
read block failed check_tree_block
Couldn't read chunk root
Could not open root, trying backup super
Check tree block failed, want=21000192, have=0
Check tree block failed, want=21000192, have=0
Check tree block failed, want=21000192, have=0
Check tree block failed, want=21000192, have=0
Check tree block failed, want=21000192, have=0
read block failed check_tree_block
Couldn't read chunk root
Could not open root, trying backup super
No valid Btrfs found on /dev/sda1
Could not open root, trying backup super
btrfs chunk-recover ran for a few moments, but then failed with
btrfs: cmds-chunk.c:125: process_extent_buffer: Assertion
`!(exists->nmirrors >=2)ยด failed.
It looks like the chunk-recover command isn't any more available in
the latest btrfs-tools package I installed (from
https://launchpad.net/~samuel-maftoul/+archive/btrfs-tools/+build/4461274).
It did work with the default btrfs from ubuntu 13.10 though, but
showed the error above
It looks a lot similar to
http://www.mail-archive.com/linux-btrfs@vger.kernel.org/msg27390.html
and
http://www.spinics.net/lists/linux-btrfs/msg26274.html
Is there anything else I could try?
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