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block: add eject request callback

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Recent versions of udev always keep the tray locked so that the kernel
can observe "eject request" events (aka tray button presses) even on
discs that aren't mounted.  Add support for these events in the ATAPI
and SCSI cd drive device models.

To let management cope with the behavior of udev, an event should also
be added for "tray opened/closed".  This way, after issuing an "eject"
command, management can poll until the guests actually reacts to the
command.  They can then issue the "change" command after the tray has been
opened, or try with "eject -f" after a (configurable?) timeout.  However,
with this patch and the corresponding support in the device models,
at least it is possible to do a manual two-step eject+change sequence.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Paolo Bonzini 2011-11-07 17:50:13 +01:00 • committed by Kevin Wolf
parent 7704df98b0
commit 025ccaa7f9
3 changed files with 23 additions and 4 deletions
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10
blockdev.c
View file

@ -635,10 +635,12 @@ static int eject_device(Monitor *mon, BlockDriverState *bs, int force)
qerror_report(QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs));
return -1;
}
if (!force && !bdrv_dev_is_tray_open(bs)
&& bdrv_dev_is_medium_locked(bs)) {
qerror_report(QERR_DEVICE_LOCKED, bdrv_get_device_name(bs));
return -1;
if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) {
bdrv_dev_eject_request(bs, force);
if (!force) {
qerror_report(QERR_DEVICE_LOCKED, bdrv_get_device_name(bs));
return -1;
}
}
bdrv_close(bs);
return 0;