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migration: implement bdrv_all_find_vmstate_bs helper

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The patch also ensures proper locking for the operation.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
CC: Kevin Wolf <kwolf@redhat.com>
Tested-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Denis V. Lunev 2015-11-19 09:42:10 +03:00 • committed by Juan Quintela
parent 0b46160521
commit 7cb1448149
3 changed files with 21 additions and 15 deletions
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15
block/snapshot.c
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@ -469,3 +469,18 @@ int bdrv_all_create_snapshot(QEMUSnapshotInfo *sn,
*first_bad_bs = bs;
return err;
}
BlockDriverState *bdrv_all_find_vmstate_bs(void)
{
bool not_found = true;
BlockDriverState *bs = NULL;
while (not_found && (bs = bdrv_next(bs))) {
AioContext *ctx = bdrv_get_aio_context(bs);
aio_context_acquire(ctx);
not_found = !bdrv_can_snapshot(bs);
aio_context_release(ctx);
}
return bs;
}