On 6/20/18 5:52 AM, Maurizio Lombardi wrote: > Hi Jens, > > Dne 23.5.2018 v 16:42 Jens Axboe napsal(a): >> On 5/23/18 3:19 AM, Maurizio Lombardi wrote: >>> >>> >>> Dne 22.5.2018 v 16:47 Jens Axboe napsal(a): >>>> It's been many years, but back in the day the program writing the cd >>>> would eject the disc once done. This of course forces a reload of >>>> the toc and clearing of the flag. What program is this? Seems like >>>> it should probably eject when it's done. >>> >>> They are using wodim to burn the CDs on their servers. >>> The problem is that they do not want the CD to be ejected because their >>> drives >>> lack a motorized tray, thus requiring manual intervention which they would >>> like to avoid. >> >> I took a quick look at it, man that sr driver needs a bit of love :-) >> >> Anyway, I wonder if something like the below would work. Check for >> a close track command in the sr completion handler, and flag the media >> as changed if we see one. Totally untested... >> >> >> diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c >> index 3f3cb72e0c0c..48f0d7a096db 100644 >> --- a/drivers/scsi/sr.c >> +++ b/drivers/scsi/sr.c >> @@ -328,6 +328,9 @@ static int sr_done(struct scsi_cmnd *SCpnt) >> scmd_printk(KERN_INFO, SCpnt, "done: %x\n", result); >> #endif >> >> + if (SCpnt->cmnd[0] == GPCMD_CLOSE_TRACK) >> + cd->device->changed = 1; >> + >> /* >> * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial >> * success. Since this is a relatively rare error condition, no >> > > I just want to let you know that I tested the patch but unfortunately it > doesn't work. > I will try to find out what GPCMD_* commands are passed to sr_done() when > burning a disc > to see if there is another one which we could use.
It's been a decade since I last messed with this or burned a cd-r, so that would be appreciated. blktrace should be enough to tell you what commands are being sent. -- Jens Axboe
