Messages in this thread Patch in this message | | | Date | Thu, 02 Dec 2004 08:57:01 +0100 | From | Frank Steiner <> | Subject | Re: cd burning, capabilities and available modes |
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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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