Andrew, here are two nbd patches to apply to 2.5.74-mm2 after two of the previous patches (from Lou Langholtz) are reverted: nbd-ioctl-compat.patch (patch 6) nbd-locking-fixes.patch (patch 7) I'm fine with leaving the first 5 patches of his in there. The two attached patches are: 1) nbd-remove_open_release.diff - remove the unneeded nbd_open and nbd_release functions 2) nbd-block_layer_compat.diff - ensure that nbd and the block layer agree about device block sizes and total device sizes and should be applied in this order. Thanks, Paul