Michael Niederle wrote: > Hi! > > I'm not sure whether this *should* be possible, but I think it *shouldn't* > crash: > > I created a snapshot of the root directory within a subdirectory: > > # mount /dev/sde2 /mnt > # cd /mnt > # mkdir save > # btrfs subvolume snapshot . save/snap1 > # umount /mnt > > Then I tried to mount the snapshot: > > # mount -o subvol=save/snap1 /dev/sde2 /mnt > > This inevitably leads to a segfault in the btrfs-driver crashing the whole > system. I tried this with kernel versions 2.6.32 and 2.6.37.rc4. > > If I create the subvolume within the root directory of the btrfs volume > everything works fine. > > I'm using btrfs for nearly a year by now (since the release of 2.6.32) and am > using subvolumes within subdirectories since then but never tried to directly > mount one until today, when my main btrfs volume crashed (by a hardware > failure > or due to a bug in 2.6.36 - I don't know). > > If you cannot reproduce this behaviour I can try to send you the kernel log > (not so easy, because the system crashes and I will have to write it down by > hand).
It's currently not allowed to mount a subvolume which is not created in the root directory of the default subvolume, so you should have failed to mount, but you hit a bug.. I've fixed it, and will send out the patch in minutes. -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
