Since 2.6.29-rc1 contains btrfs I had to try it.

However the loopback mount of my btrfs formatted file fails:

u...@host:~$ dd if=/dev/zero of=btrfs.img bs=1MB count=512

u...@host:~$ mkfs.btrfs btrfs.img
fs created label (null) on btrfs.img
    nodesize 4096 leafsize 4096 sectorsize 4096 size 488.28MB
Btrfs v0.16+da35ab2b0b54

u...@host:~$ sudo mount -t btrfs -o loop btrfs.img /mnt/btrfs
mount: /dev/loop1: can't read superblock


Is this version of mkfs.btrfs compatible with the kernel module in 2.6.29-rc1?

Any help is appreciated.

Regards, Peter.
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