From 2d3735d3bf61d5c8e154a197a11535cc65044334 Mon Sep 17 00:00:00 2001 From: Stefan Hajnoczi Date: Wed, 18 Jan 2012 14:40:41 +0000 Subject: block: check bdrv_in_use() before blockdev operations Long-running block operations like block migration and image streaming must have continual access to their block device. It is not safe to perform operations like hotplug, eject, change, resize, commit, or external snapshot while a long-running operation is in progress. This patch adds the missing bdrv_in_use() checks so that block migration and image streaming never have the rug pulled out from underneath them. Signed-off-by: Stefan Hajnoczi Signed-off-by: Kevin Wolf --- block.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'block.c') diff --git a/block.c b/block.c index 3f072f627..43f648437 100644 --- a/block.c +++ b/block.c @@ -1020,6 +1020,10 @@ int bdrv_commit(BlockDriverState *bs) return -EACCES; } + if (bdrv_in_use(bs) || bdrv_in_use(bs->backing_hd)) { + return -EBUSY; + } + backing_drv = bs->backing_hd->drv; ro = bs->backing_hd->read_only; strncpy(filename, bs->backing_hd->filename, sizeof(filename)); -- cgit v1.2.3