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block: Catch attempt to attach multiple devices to a blockdev

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For instance, -device scsi-disk,drive=foo -device scsi-disk,drive=foo
happily creates two SCSI disks connected to the same block device.
It's all downhill from there.

Device usb-storage deliberately attaches twice to the same blockdev,
which fails with the fix in place.  Detach before the second attach
there.

Also catch attempt to delete while a guest device model is attached.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Markus Armbruster 2010-06-29 16:58:30 +02:00 • committed by Kevin Wolf
parent dfb0acd887
commit 18846dee1a
11 changed files with 74 additions and 15 deletions
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2
block_int.h
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@ -148,6 +148,8 @@ struct BlockDriverState {
BlockDriver *drv; /* NULL means no media */
void *opaque;
DeviceState *peer;
char filename[1024];
char backing_file[1024]; /* if non zero, the image is a diff of
this file image */