I have changed file system label few times in total. When I tried
to mount it after that, it became not mountable:
# mount /dev/sdb1 /mnt
mount: Not a directory
In dmesg I see the following after above command:
[ 5198.413202] BTRFS info (device sdb1): disk space caching is enabled
[ 5198.629958] BTRFS: checking UUID tree
I have lots of manually sorted downloaded files on this partition
(in other words nothing very important but downloading and sorting all
files again would require a lot of time), so I would appreciate any
help. This is what I have tried so far to restore it:
# btrfs check /dev/sdb1
Checking filesystem on /dev/sdb1
UUID: 787e3bc1-7583-4bd8-a52e-e57fd7fc9243
checking extents
btrfs: cmds-check.c:2266: check_owner_ref: Assertion `!(rec->is_root)'
failed.
zsh: abort btrfs check /dev/sdb1
Since it failed after "checking extents" I decided to try
--init-extent-tree:
# btrfs check --init-extent-tree /dev/sdb1
Checking filesystem on /dev/sdb1
UUID: 787e3bc1-7583-4bd8-a52e-e57fd7fc9243
Creating a new extent tree
Failed to find [29376512, 168, 16384]
btrfs unable to find ref byte nr 29376512 parent 0 root 1 owner 1 offset 0
Failed to find [30818304, 168, 16384]
btrfs unable to find ref byte nr 30818304 parent 0 root 1 owner 0 offset 1
Failed to find [47546368, 168, 16384]
btrfs unable to find ref byte nr 47546368 parent 0 root 1 owner 0 offset 1
parent transid verify failed on 29442048 wanted 4 found 2758
Ignoring transid failure
checking extents
btrfs: cmds-check.c:2266: check_owner_ref: Assertion `!(rec->is_root)'
failed.
zsh: abort btrfs check --init-extent-tree /dev/sdb1
# btrfs restore /dev/sdb1 /media/backup/sdb1 # this commands exits
after a second with 0 return code
# echo $?
0
I also tried btrfs restore with --path-regex and got the same result.
# btrfs-find-root /dev/sdb1
Super think's the tree root is at 29360128, chunk root 20971520
Well block 4194304 seems great, but generation doesn't match, have=2,
want=2759 level 0
Well block 4243456 seems great, but generation doesn't match, have=3,
want=2759 level 0
Found tree root at 29360128 gen 2759 level 1
https://btrfs.wiki.kernel.org/index.php/Restore talks about picking root
with largest transid, but I do not see "transid" in my output, so not
sure what to do.
I also tried btrfsck:
# btrfsck /dev/sdb1
*** Error in `btrfs check': double free or corruption (fasttop):
0x0000000001074020 ***
zsh: abort btrfsck /dev/sdb1
# btrfsck -b /dev/sdb1
*** Error in `btrfs check': double free or corruption (fasttop):
0x00000000024e8020 ***
zsh: abort btrfsck -b /dev/sdb1
# btrfsck --repair /dev/sdb1
enabling repair mode
*** Error in `btrfs check': double free or corruption (fasttop):
0x0000000000e26020 ***
zsh: abort btrfsck --repair /dev/sdb1
# uname -a
Linux debian 3.15.0-pf2 #1 SMP Sat Jun 28 15:09:48 EEST 2014 x86_64
GNU/Linux
# btrfs --version
Btrfs v3.14.1
# btrfs fi show
Label: 'label' uuid: 787e3bc1-7583-4bd8-a52e-e57fd7fc9243
Total devices 1 FS bytes used 411.76GiB
devid 1 size 465.76GiB used 465.76GiB path /dev/sdb1
Btrfs v3.14.1
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