Interesting ... may allow us to map a few of the NT STATUS codes
to this new rc 135.  We will have to scan the error mapping table

On Wed, Feb 8, 2012 at 6:29 AM, David Howells <[email protected]> wrote:
> Now that the kernel has filesystems (and possibly other services) that want to
> look up internet addresses corresponding to arbitrary hostnames retrieved from
> the server, it would seem useful to provide a couple of error codes to 
> indicate
> problems with the look up, rather than overloading some other error code.
>
> Define ENONAMESERVICE to indicate "Network name service unavailable".  This 
> can
> be used to indicate, for example, that an attempt was made by dns_query() to
> make a query, but the name server (e.g. a DNS server) it is supposed to 
> contact
> didn't answer or that it couldn't determine the location of a suitable server.
>
> Define ENAMEUNKNOWN to indicate "Network name unknown".  This can be used to
> indicate, for example, that an attempt was made by dns_query() to make a 
> query,
> but the name server (e.g. a DNS server) replied indicating that it had no
> matching records.
>
> The DNS query upcall program can report these to keyctl_reject() so that 
> cached
> failed queries will respond with these errors until they expire.
>
> Signed-off-by: David Howells <[email protected]>
> ---
>
>  arch/alpha/include/asm/errno.h  |    2 ++
>  arch/mips/include/asm/errno.h   |    2 ++
>  arch/parisc/include/asm/errno.h |    2 ++
>  arch/sparc/include/asm/errno.h  |    2 ++
>  include/asm-generic/errno.h     |    2 ++
>  5 files changed, 10 insertions(+), 0 deletions(-)
>
> diff --git a/arch/alpha/include/asm/errno.h b/arch/alpha/include/asm/errno.h
> index 5edc21e..d6e8582 100644
> --- a/arch/alpha/include/asm/errno.h
> +++ b/arch/alpha/include/asm/errno.h
> @@ -122,6 +122,8 @@
>
>  #define        ERFKILL         138     /* Operation not possible due to 
> RF-kill */
>  #define        ENOAUTHSERVICE  139     /* Authentication service not 
> available */
> +#define        ENONAMESERVICE  140     /* Network name service unavailable */
> +#define        ENAMEUNKNOWN    141     /* Network name unknown */
>
>  #define EHWPOISON      139     /* Memory page has hardware error */
>
> diff --git a/arch/mips/include/asm/errno.h b/arch/mips/include/asm/errno.h
> index 9e0b83f..5ae25aa 100644
> --- a/arch/mips/include/asm/errno.h
> +++ b/arch/mips/include/asm/errno.h
> @@ -121,6 +121,8 @@
>
>  #define        ERFKILL         167     /* Operation not possible due to 
> RF-kill */
>  #define        ENOAUTHSERVICE  168     /* Authentication service not 
> available */
> +#define        ENONAMESERVICE  169     /* Network name service unavailable */
> +#define        ENAMEUNKNOWN    170     /* Network name unknown */
>
>  #define EHWPOISON      168     /* Memory page has hardware error */
>
> diff --git a/arch/parisc/include/asm/errno.h b/arch/parisc/include/asm/errno.h
> index c4598b6..6b3bc7f 100644
> --- a/arch/parisc/include/asm/errno.h
> +++ b/arch/parisc/include/asm/errno.h
> @@ -122,6 +122,8 @@
>
>  #define        ERFKILL         256     /* Operation not possible due to 
> RF-kill */
>  #define        ENOAUTHSERVICE  257     /* Authentication service not 
> available */
> +#define        ENONAMESERVICE  258     /* Network name service unavailable */
> +#define        ENAMEUNKNOWN    259     /* Network name unknown */
>
>  #define EHWPOISON      257     /* Memory page has hardware error */
>
> diff --git a/arch/sparc/include/asm/errno.h b/arch/sparc/include/asm/errno.h
> index ab4f9f5..5fab088 100644
> --- a/arch/sparc/include/asm/errno.h
> +++ b/arch/sparc/include/asm/errno.h
> @@ -112,6 +112,8 @@
>
>  #define        ERFKILL         134     /* Operation not possible due to 
> RF-kill */
>  #define        ENOAUTHSERVICE  135     /* Authentication service not 
> available */
> +#define        ENONAMESERVICE  136     /* Network name service unavailable */
> +#define        ENAMEUNKNOWN    137     /* Network name unknown */
>
>  #define EHWPOISON      135     /* Memory page has hardware error */
>
> diff --git a/include/asm-generic/errno.h b/include/asm-generic/errno.h
> index 52325ca..719f60c 100644
> --- a/include/asm-generic/errno.h
> +++ b/include/asm-generic/errno.h
> @@ -108,6 +108,8 @@
>
>  #define ERFKILL                132     /* Operation not possible due to 
> RF-kill */
>  #define        ENOAUTHSERVICE  133     /* Authentication service not 
> available */
> +#define        ENONAMESERVICE  134     /* Network name service unavailable */
> +#define        ENAMEUNKNOWN    135     /* Network name unknown */
>
>  #define EHWPOISON      133     /* Memory page has hardware error */
>
>
> --
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-- 
Thanks,

Steve
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