Re: [PATCH] xen/blkfront: Only check REQ_FUA for writes

[Juergen Gross <jgross@xxxxxxxx>]

On 26.04.23 18:40, Ross Lagerwall wrote:
> The existing code silently converts read operations with the
> REQ_FUA bit set into write-barrier operations. This results in data
> loss as the backend scribbles zeroes over the data instead of returning
> it.
>
> While the REQ_FUA bit doesn't make sense on a read operation, at least
> one well-known out-of-tree kernel module does set it and since it
> results in data loss, let's be safe here and only look at REQ_FUA for
> writes.
>
> Signed-off-by: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>
Acked-by: Juergen Gross <jgross@xxxxxxxx>


Juergen

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