I've got a btrfs on an sd card, which I'm using as the root fs on a
beagle. That's not the problem :)
The machine I generate my images on has an internal sd reader, and I
also have a usb card reader. After creating the fs on the internal
reader, I ended up plugging it in on the external reader.
internal: sdd
external: sdh
mount /dev/sdh2 /mnt -t btrfs
> mount: /dev/sdh2: can't read superblock
[15035.538462] device fsid 48fadf7ed76537-bb9c7266ecb8b2 devid transid
8986 /dev/sdh2
[15035.538462] open /dev/sdd2 failed
If I plug it back into the internal reader, it mounts fine on /dev/sdd2.
An strace of btrfsctl -a shows it reading /dev/sdh2, and there's no
mention of /dev/sdd:
> open("/dev/sdh2", O_RDONLY) = 4
> pread(4, "\2067kF\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 2859, 65536) = 2859
The fs mounts fine on the external reader on a different machine.
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