[Debburn-devel] Re: broken device locking,
sg vs. sg_io on block devices
Alan Cox
alan at lxorguk.ukuu.org.uk
Wed Apr 11 11:31:02 UTC 2007
> > Can we do following without having side effects:
> >
> > open("/dev/sr0",O_EXCL|O_RDWR); /* no matter what it returns */
> > fcntl(..., F_SETLK); /* no matter what it returns */
> > ioctl(f, SCSI_IOCTL_GET_IDLUN, &x);
> > ioctl(f, SCSI_IOCTL_GET_BUS_NUMBER, &jo);
> >
> > Can you guarantee us that bit?
open() has side effects. The CD layer allows you to open with O_NDELAY if
you want to avoid them.
> [1] and when we get real critical questions then everything we get is
> radio silence? Very kindly. NOT.
Given the attitude that was shown before be glad I'm even bothering to
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