read-only subvolumes?

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Hi all,

When I am creating subvolumes I get this strange behavior. If I create
a subvolume with a name longer than 4 characters it is read-only, if
the name is shorter than 5 characters the subvolume is writeable as
expected. I think it is since I upgraded to kernel version 2.6.38 (I
do not create subvolumes on a regular basis.). I will compile one of
the latest 2.6.37 kernels to see whether there the problem exists,
too. Another interesting point is that previously created subvolumes
are not affected.

Thanks,
Andreas Philipp

thor btrfs # btrfs subvolume create 123456789
Create subvolume './123456789'
thor btrfs # touch 123456789/lsdkfj
touch: cannot touch `123456789/lsdkfj': Read-only file system

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