Re: CD-ROM can't be ejected

[Jens Axboe]

On Thu, Sep 16 2004, Bc. Michal Semler wrote:
> Dne ?t 16. zá?í 2004 12:22 Jens Axboe napsal(a):
> > On Thu, Sep 16 2004, Bc. Michal Semler wrote:
> > > > > > On Thu, Sep 16 2004, Bc. Michal Semler wrote:
> > > > > > > notas:/home/cijoml# mount /cdrom/
> > > > > > > notas:/home/cijoml# umount /cdrom/
> > > > > > > notas:/home/cijoml# strace -o eject /dev/hdc
> > > > > > > eject: unable to eject, last error: Nep?ípustný argument
> > > > > > >
> > > > > > > As you can see, I dont't enter to directory...
> > > > > > >
> > > > > > > And output is included
> > > > > > >
> > > > > > > ioctl(3, CDROMEJECT, 0xbffffac8)        = -1 EIO (Input/output
> > > > > > > error)
> > > > > >
> > > > > > That's the important bit, the reason you get EINVAL passed back is
> > > > > > because eject tries the floppy eject as well and decides to print
> > > > > > the warning from that. It really should just stop of it sees -EIO,
> > > > > > only continue if EINVAL/ENOTTY is passed back.
> > > > > >
> > > > > > Try this little c program and report back what it tells you.
> > > > > > Compile with
> > > > > >
> > > > > > gcc -Wall -o eject eject.c
> > > > > >
> > > > > > and run without arguments.
> > > > > >
> > > > > > #include <stdio.h>
> > > > > > #include <stdlib.h>
> > > > > > #include <fcntl.h>
> > > > > > #include <string.h>
> > > > > > #include <sys/ioctl.h>
> > > > > > #include <linux/cdrom.h>
> > > > > >
> > > > > > int main(int argc, char *argv[])
> > > > > > {
> > > > > > 	int fd = open("/dev/hdc", O_RDONLY | O_NONBLOCK);
> > > > > > 	struct cdrom_generic_command cgc;
> > > > > > 	struct request_sense sense;
> > > > > >
> > > > > > 	memset(&cgc, 0, sizeof(cgc));
> > > > > > 	memset(&sense, 0, sizeof(sense));
> > > > > >
> > > > > > 	cgc.cmd[0] = 0x1b;
> > > > > > 	cgc.cmd[4] = 0x02;
> > > > > > 	cgc.sense = &sense;
> > > > > > 	cgc.data_direction = CGC_DATA_NONE;
> > > > > >
> > > > > > 	if (ioctl(fd, CDROM_SEND_PACKET, &cgc) == 0) {
> > > > > > 		printf("eject worked\n");
> > > > > > 		return 0;
> > > > > > 	}
> > > > > >
> > > > > > 	printf("command failed - sense %x/%x/%x\n", sense.sense_key,
> > > > > > sense.asc, sense.ascq); return 1;
> > > > > > }
> > > > >
> > > > > 2.4.27-mh1
> > > > > notas:~# /home/cijoml/eject
> > > > > ATAPI device hdc:
> > > > >   Error: Not ready -- (Sense key=0x02)
> > > > >   (reserved error code) -- (asc=0x53, ascq=0x02)
> > > > >   The failed "Start/Stop Unit" packet command was:
> > > > >   "1b 00 00 00 02 00 00 00 00 00 00 00 "
> > > > > command failed - sense 2/53/2
> > > >
> > > > Your tray is still locked, are you sure it isn't mounted?
> > >
> > > Yes I am. This is written into console and I am logged only into this
> > > console and I copied whole commands from login to eject... :(
> >
> > For the third time, don't trim the cc list! group reply please.
> >
> > Something else must be keeping your drive locked. What else do you have
> > running in the system? It's enough if one app is just holding the drive
> > open, the drive wont get unlocked on umount then.
> 
> only thing which access cdrom is cpudynd and it access harddrive too....
> 
> notas:~# fuser /dev/hdc
> /dev/hdc:             8102
> notas:~# ps aux|grep 8102
> root      8102  0.0  0.1  1536  456 ?        SNs  13:49   
> 0:00 /usr/sbin/cpudynd -i 1 -p 0.5 0.9 -l 7 -t 120 -h /dev/hda,/dev/hdc

well there you go, that is what is keeping the drive locked. cdrom
cannot know which process locked it or not, all it knows is that the
usage count is non-zero on umount, so it doesn't unlock the tray.

-- 
Jens Axboe

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