Dne 28.7.2017 v 17:26 Stanislav Brabec napsal(a):
> Dne 27.7.2017 v 10:58 Yuriy M. Kaminskiy napsal(a):
>> (And, I used cdrom a long time ago, but IIRC there were some driver
>> settings to automatically close tray on device open, so that this patch
>> should not be needed?)
>
> Thanks for this hint. Yes, you are true:
> /proc/sys/dev/cdrom/autoclose
> /proc/sys/dev/cdrom/autoeject
>
> But this does not work with the current mount. The mount request will
> expire on timeout earlier than the tray of ordinary CDROM closes.
>
> But yes, it is possible to implement a different, simpler patch that
> will make the autoclose feature working, and not cause delays in case of
> no medium.
>
I did some testing.
The kernel autoclose feature should do exactly the same as my patch
attempts. But kernel seems to be broken. Before the tray actually
closes, kernel returns ENOMEDIUM.
>From strace log when a standard DVD drive is open with a DVD laying on
the tray:
17:30:32.719041 access("/dev/sr0", F_OK) = 0 <0.000005>
(here the tray starts to close)
17:30:32.719054 open("/dev/sr0", O_RDONLY|O_CLOEXEC) = -1 ENOMEDIUM (No
medium found) <1.450436>
...
17:30:34.169943 mount("/dev/sr0", "/mnt", "vfat", MS_MGC_VAL|MS_SILENT,
NULL) = -1 ENOMEDIUM (No medium found) <0.083741>
I am nearly sure that it worked ~20 years ago.
--
Best Regards / S pozdravem,
Stanislav Brabec
software developer
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