On Mon, Nov 10, 2014 at 12:41:45PM +0800, lihuiba wrote: > bdrv_co_flush() will flush all cached data to persistent storage, and I'm > wondering whether guest sync() will eventually trigger bdrv_co_flush() be > called.
virtio-blk and other emulated storage controllers use bdrv_aio_flush() to implement disk write cache flush commands. > Intuitively, guest sync() should trigger bdrv_co_flush() in qemu. But simple > > grep gave me a negative answer. So I'm wondering why it's not like what I > > suspected. A correctly configured guest will send cache flush commands, and a correctly configured QEMU will honor them. If want help finding the answer, please provide details: 1. Your QEMU command-line 2. Your guest OS version and file system mount options 3. Why you believe bdrv_co_flush() is not being called Stefan
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