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    SubjectRe: Linux 2.6.19
    On Wed, 29 Nov 2006 14:21:21 -0800 (PST) Linus Torvalds (LT) wrote:

    LT> So go get it. It's one of those rare "perfect" kernels. So if it doesn't
    LT> happen to compile with your config (or it does compile, but then does
    LT> unspeakable acts of perversion with your pet dachshund), you can rest easy
    LT> knowing that it's all your own d*mn fault, and you should just fix your
    LT> evil ways.

    Ok, so 2.6.18 used to get along fine with cryptoloop and 2.6.19 refuses to
    cooperate. An strace of "losetup -e aes /dev/loop0 /dev/hda7" without all the
    terminal interaction shows:

    open("/dev/hda7", O_RDWR|O_LARGEFILE) = 3
    open("/dev/loop0", O_RDWR|O_LARGEFILE) = 4
    mlockall(MCL_CURRENT|MCL_FUTURE) = 0
    ...
    munmap(0xb7fc8000, 4096) = 0
    ioctl(4, 0x4c00, 0x3) = 0
    close(3) = 0
    ioctl(4, 0x4c04, 0xbfc21670) = -1 ENOENT (No such file or directory)
    ioctl(4, 0x4c02, 0xbfc215e0) = -1 ENOENT (No such file or directory)
    dup(2) = 3
    fcntl64(3, F_GETFL) = 0x8002 (flags O_RDWR|O_LARGEFILE)
    fstat64(3, {st_mode=S_IFCHR|0720, st_rdev=makedev(4, 1), ...}) = 0
    ioctl(3, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 opost isig icanon echo ...}) = 0
    mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7fc8000
    _llseek(3, 0, 0xbfc21040, SEEK_CUR) = -1 ESPIPE (Illegal seek)
    write(3, "ioctl: LOOP_SET_STATUS: No such "..., 50ioctl: LOOP_SET_STATUS: No such file or directory) = 50
    close(3) = 0
    munmap(0xb7fc8000, 4096) = 0
    ioctl(4, 0x4c01, 0) = 0
    close(4) = 0
    exit_group(1) = ?

    Linux 2.6.18 does not fail at

    ioctl(4, 0x4c04, ...)

    I know that dm-crypt is now the preferred method of doing such things, but as
    long as cryptoloop exists in the kernel I'd expect it to work.

    Cheers,
    - Udo
    [unhandled content-type:application/pgp-signature]
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