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Date: Mon, 22 Sep 2014 17:44:26 +0100 From: Jason Vas Dias <jason.vas.dias@...il.com> To: linux-kernel <linux-kernel@...r.kernel.org> Subject: mount BTRFS filesystems created with 3.8+ under 2.6.32 kernels ? Good day - I wonder if there is a GIT repository somewhere with a backport of the BTRFS kernel modules that will allow BTRFS filesystems created with a 3.8 kernel to be mounted on a 2.6.32+ kernel . When I try this, the 2.6.32 kernel crashes with the message : 'BTRFS: couldn't mount because of unsupported optional features (40)' ( kernel-2.6.32-431.29.2.el6.x86_64 from RHEL 6.4+ ). The same filesystem mounts fine under Oracle EL6 which now comes with kernel-uek 3.8+ . Has anyone tried to backport the 3.8 BTRFS capabilities to 2.6.32 , or is there any way I can remove "Option 40" to get it to mount without crashing ? It is a very small BTRFS filesystem with a root filesystem and a few snapshots. I did not specify any BTRFS options in : $ mkfs.btrfs /dev/sda9; ... # mount on /mnt/btr & create some files $ btrfs subvolume snapshot -r /mnt/btr /mnt/btr/root-0 $ btrfs subvolume snapshot /mnt/btr /mnt/btr/root-w-0 Now I can mount /dev/sda9 under any 3.8+ kernel, but not under 2.6.32 . Thanks in advance for any replies, Best Regards, Jason Vas Dias -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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