Re: [Qemu-devel] [PATCH 2/4] block: use fdatasync instead of fsync

[Blue Swirl]

On Mon, Aug 31, 2009 at 11:17 PM, Christoph Hellwig<address@hidden> wrote:
>
> If we are flushing the caches for our image files we only care about the
> data (including the metadata required for accessing it) but not things
> like timestamp updates.  So use fdatasync instead of fsync to implement
> the flush operations.

> -    fsync(s->fd);
> +    fdatasync(s->fd);

There is no fdatasync outside of Linux, not in OpenBSD and mingw32 at
least. But you could add a probe for it to configure.