• Johannes Stezenbach's avatar
    compat_ioctl: fix warning caused by qemu · 390192b3
    Johannes Stezenbach authored
    On Linux x86_64 host with 32bit userspace, running
    qemu or even just "qemu-img create -f qcow2 some.img 1G"
    causes a kernel warning:
    ioctl32(qemu-img:5296): Unknown cmd fd(3) cmd(00005326){t:'S';sz:0} arg(7fffffff) on some.img
    ioctl32(qemu-img:5296): Unknown cmd fd(3) cmd(801c0204){t:02;sz:28} arg(fff77350) on some.img
    ioctl 00005326 is CDROM_DRIVE_STATUS,
    ioctl 801c0204 is FDGETPRM.
    The warning appears because the Linux compat-ioctl handler for these
    ioctls only applies to block devices, while qemu also uses the ioctls on
    plain files.
    Signed-off-by: default avatarJohannes Stezenbach <js@sig21.net>
    Acked-by: default avatarArnd Bergmann <arnd@arndb.de>
    Signed-off-by: default avatarJens Axboe <jaxboe@fusionio.com>
compat_ioctl.c 20.7 KB