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authorKevin Wolf <kwolf@redhat.com>2017-09-22 14:50:12 +0200
committerKevin Wolf <kwolf@redhat.com>2017-09-26 14:46:23 +0200
commitf3adefb2cea1c63b7b198acaef5e40eb4b2d2d39 (patch)
tree38b95ac286ddedae55d3b540c0a52db6c1b6984f /block
parent7a6ab45e19b615b9285b9cfa2bbc1fee012bc8d7 (diff)
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qemu-io: Drop write permissions before read-only reopen
qemu-io provides a 'reopen' command that allows switching from writable to read-only access. We need to make sure that we don't try to keep write permissions to a BlockBackend that becomes read-only, otherwise things are going to fail. This requires a bdrv_drain() call because otherwise in-flight AIO write requests could issue new internal requests while the permission has already gone away, which would cause assertion failures. Draining the queue doesn't break AIO requests in any new way, bdrv_reopen() would drain it anyway only a few lines later. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Fam Zheng <famz@redhat.com>
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