On Sun, Apr 26, 2015 at 08:20:07AM -0700, Marc MERLIN wrote: > This is the weirdest thing: > gargamel:/var/log# mount /dev/mapper/raid0d2 /mnt/btrfs_space > mount: wrong fs type, bad option, bad superblock on /dev/mapper/raid0d2, > missing codepage or helper program, or other error > In some cases useful info is found in syslog - try > dmesg | tail or so > [ 835.718898] BTRFS info (device dm-5): disk space caching is enabled > [ 835.778580] BTRFS: failed to read the system array on dm-5 > [ 835.819223] BTRFS: open_ctree failed > > gargamel:/var/log# mount /dev/mapper/raid0d1 /mnt/btrfs_space > [ 847.047607] BTRFS: device label btrfs_space devid 1 transid 40929 /dev/mapper/raid0d1 > [ 847.073955] BTRFS info (device dm-4): disk space caching is enabled > > The previous boot, I had to mount raid0d2 because raid0d1 didn't work. > > Label: 'btrfs_space' uuid: 01334b81-c0db-4e80-92e4-cac4da867651 > Total devices 2 FS bytes used 401.54GiB > devid 1 size 836.13GiB used 295.02GiB path /dev/mapper/raid0d1 > devid 2 size 836.13GiB used 295.01GiB path /dev/mapper/raid0d2 > > Data, RAID0: total=580.00GiB, used=398.22GiB > System, RAID1: total=8.00MiB, used=64.00KiB > System, single: total=4.00MiB, used=0.00B > Metadata, RAID1: total=5.00GiB, used=3.08GiB > Metadata, single: total=8.00MiB, used=0.00B > GlobalReserve, single: total=512.00MiB, used=0.00B > > Those are 2 crypted disks which are already decrypted by the time I try > to mount them, I just don't understand why btrfs fails if I mount > one device but works with the other one, or the other way around. > > Any idea what could be causing this? The usual reason for this is that btrfs dev scan isn't being run properly. It's usually handled by udev -- most distributions will put the appropriate hooks in their udev configuration if you have the distribution's btrfs-progs package installed. If you have only a self-built btrfs-progs from git installed, then the udev hooks probably aren't there, and you'll need to configure it yourself (or arrange to have btrfs dev scan run after the cryptsetup open operation). Hugo. -- Hugo Mills | You can't expect a boy to be vicious until he's gone hugo@... carfax.org.uk | to a good school. http://carfax.org.uk/ | PGP: E2AB1DE4 | Saki
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