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block: Add backing_blocker in BlockDriverState

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This makes use of op_blocker and blocks all the operations except for
commit target, on each BlockDriverState->backing_hd.

The asserts for op_blocker in bdrv_swap are removed because with this
change, the target of block commit has at least the backing blocker of
its child, so the assertion is not true. Callers should do their check.

Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Fam Zheng 2014-05-23 21:29:47 +08:00 • committed by Stefan Hajnoczi
parent 920beae103
commit 826b6ca0b0
3 changed files with 23 additions and 5 deletions
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2
block/mirror.c
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@ -498,7 +498,7 @@ immediate_exit:
/* drop the bs loop chain formed by the swap: break the loop then
* trigger the unref from the top one */
BlockDriverState *p = s->base->backing_hd;
s->base->backing_hd = NULL;
bdrv_set_backing_hd(s->base, NULL);
bdrv_unref(p);
}
}