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    Subject[BUG] 2.6.25-rc2-git3 broke cdrecord
    On my main workstation (Intel P965 chipset, ICH8 SATA driven by ahci,
    Samsung/Toshiba SH-203P SATA DVD writer, FC5 user-space), cdrecord
    stopped working on the 2.6.25-rc3 kernel, with the complaint:

    Warning: controller returns zero sized CD capabilities page.
    Warning: controller returns wrong page 0 for CD capabilities page (2A).

    There's nothing in dmesg to suggest that the kernel has experienced
    some problem.

    2.6.25-rc2-git2 was the last working kernel, 2.6.25-rc2-git3 up to
    today's 2.6.25-rc3-git3 are all non-working.

    I've narrowed the cause down to these two commits in 2.6.25-rc2-git3:

    block: update bio according to DMA alignment padding

    block: add request->raw_data_len

    Four or so subsequent commits depend on the second of these, so it's
    easier to test them by applying them to -git2 than to revert them.

    Also, these two need to be treated as a unit. With only the first
    applied, I get a massive delay as init tries to start udev, and then
    if I try cdrecord it hangs in an unkillable state.

    I've put some information in
    - the kernel's .config
    - cdrecord -VV dev=/dev/scd0 blank=fast output for 2.6.25-rc2-git2 and -git3
    - strace -v logs for the above cdrecord runs


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