Hi,
Long story short:
I've got btrfs raid10 six disk array plus 2 other disks just having a
"normal setup" btrfs filesystems.
Everything was running happily under linux 3.5 and 3.7.
3.5 was a stock ubuntu kernel, 3.7 was "slightly less stock" ubuntu kernel.
Now I've upgraded my box to 3.8 and none of btrfs file systems mounts
any more. I got open_ctree errors every time I try to mount those. When
I reboot system choosing old kernel from grub - everything runs smooth
again. Was there any "on disk format" change or compatibility change?.
Some kernel.log output:
[ 13.517952] device fsid 9415cddb-e3b8-4977-804c-369553a7eda7 devid 4
transid 111130 /dev/sdh1
[ 13.518535] btrfs: disk space caching is enabled
[ 13.518773] btrfs: failed to read the system array on sdh1
[ 13.523175] btrfs: open_ctree failed
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