Re: [Qemu-devel] [PATCH] hw/9pfs: fix P9_STATS_GEN handling

["Daniel P. Berrange" <berrange@redhat.com>]

On Sun, Oct 27, 2013 at 03:41:34AM +0300, Kirill A. Shutemov wrote:
> From: "Kirill A. Shutemov" <kirill@shutemov.name>
> 
> Currently we have few issues with P9_STATS_GEN:
> 
>  - We don't try to read st_gen anything except files or directories, but
>    still set P9_STATS_GEN bit in st_result_mask. It may mislead client:
>    we present garbage as valid st_gen.
> 
>  - If we failed to get valid st_gen with ENOTTY, we ignore error, but
>    still set P9_STATS_GEN bit in st_result_mask.
> 
>  - If we failed to get valid st_gen with any other errno, we fail
>    getattr altogether. It's excessive: we block valid client use-cases,
>    like chdir(2) to non-readable directory with execution bit set.
> 
> The patch fixes these issues and cleanup code a bit.
> 
> Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name>

Reviewed-by: Daniel P. Berrange <berrange@redhat.com>

Daniel
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