Re: [Xen-devel] [PATCH 1/3] qemu-xen-traditional: use O_DIRECT to open disk images for IDE

["Zhang, Yang Z" <yang.z.zhang@xxxxxxxxx>]

> -----Original Message-----
> From: xen-devel-bounces@xxxxxxxxxxxxx
> [mailto:xen-devel-bounces@xxxxxxxxxxxxx] On Behalf Of Stefano Stabellini
> Sent: Friday, March 23, 2012 10:51 PM
> To: xen-devel@xxxxxxxxxxxxxxxxxxx
> Cc: Ian.Jackson@xxxxxxxxxxxxx; Stefano Stabellini
> Subject: [Xen-devel] [PATCH 1/3] qemu-xen-traditional: use O_DIRECT to open
> disk images for IDE
> 
> Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
> ---
>  xenstore.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/xenstore.c b/xenstore.c
> index 4c483e2..ac90366 100644
> --- a/xenstore.c
> +++ b/xenstore.c
> @@ -643,7 +643,7 @@ void xenstore_parse_domain_config(int hvm_domid)
>           }
>              pstrcpy(bs->filename, sizeof(bs->filename), params);
> 
> -            flags = BDRV_O_CACHE_WB; /* snapshot and write-back */
> +            flags = BDRV_O_NOCACHE;
>              is_readonly = 0;
>              if (pasprintf(&buf, "%s/mode", bpath) == -1)
>                  continue;
Any reason for this change? 

best regards
yang

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