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    SubjectRe: cd burning, capabilities and available modes
    J.A. Magallon wrote

    > werewolf:/store/tmp> cdrecord -dummy dev=ATAPI:1,0,0 *.iso

    Why not use "dev=ATAPI:/dev/hdd" or whatever device in /dev/ is
    your burner...?

    > ...
    > cdrecord: Cannot allocate memory. WARNING: Cannot do mlockall(2).
    > cdrecord: WARNING: This causes a high risk for buffer underruns.
    > cdrecord: Operation not permitted. WARNING: Cannot set RR-scheduler
    > cdrecord: Permission denied. WARNING: Cannot set priority using setpriority().
    > cdrecord: WARNING: This causes a high risk for buffer underruns.
    > scsidev: 'ATAPI:1,0,0'
    > devname: 'ATAPI'
    > scsibus: 1 target: 0 lun: 0
    > Warning: Using ATA Packet interface.
    > Warning: The related Linux kernel interface code seems to be unmaintained..
    > Warning: There is absolutely NO DMA, operations thus are slow.
    > WARNING ! Cannot gain SYS_RAWIO capability !
    > : Operation not permitted

    Sth. seems to be wrong here. When I do this as user I get
    ...
    Use of ATA is preferred over ATAPI.
    Warning: Using ATA Packet interface.
    Warning: The related libscg interface code is in pre alpha.
    Warning: There may be fatal problems.
    Using libscg version 'schily-0.8'.
    ...

    so it seems that your kernel is still blocking some command in the userland.
    This might cause your problems, because I get the same write modes as user
    that I get as root. I use 2.6.9 but have allowed some more commands for
    users. You can add this in linux/drivers/block/scsi_ioctl.c to see if
    some commands are blocked as user:

    --- linux/drivers/block/scsi_ioctl.c.orig 2004-08-18 16:11:01.000000000 +0200
    +++ linux/drivers/block/scsi_ioctl.c 2004-08-18 16:11:55.000000000 +0200
    @@ -172,6 +228,12 @@
    /* And root can do any command.. */
    if (capable(CAP_SYS_RAWIO))
    return 0;
    + /* Added for debugging*/
    +
    + if(file->f_mode & FMODE_WRITE)
    + printk(KERN_WARNING "SCSI-CMD Filter: 0x%x not allowed with write-mode\n",cmd[0]);
    + else
    + printk(KERN_WARNING "SCSI-CMD Filter: 0x%x not allowed with read-mode\n",cmd[0]);

    /* Otherwise fail it with an "Operation not permitted" */
    return -EPERM;
    cu,
    Frank


    --
    Dipl.-Inform. Frank Steiner Web: http://www.bio.ifi.lmu.de/~steiner/
    Lehrstuhl f. Bioinformatik Mail: http://www.bio.ifi.lmu.de/~steiner/m/
    LMU, Amalienstr. 17 Phone: +49 89 2180-4049
    80333 Muenchen, Germany Fax: +49 89 2180-99-4049
    * Rekursion kann man erst verstehen, wenn man Rekursion verstanden hat. *

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