Re: [PATCH] nfs: fix bitmap decoder to handle a 3rd word

[Trond Myklebust]

On Wed, 2024-08-21 at 08:16 -0400, Jeff Layton wrote:
> It only decodes the first two words at this point. Have it decode the
> third word as well. Without this, the client doesn't send delegated
> timestamps in the CB_GETATTR response.
> 
> Fixes: 43df7110f4a9 ("NFSv4: Add CB_GETATTR support for delegated
> attributes")
> Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx>
> ---
> Found this while working on the delstid patches for nfsd.
> ---
>  fs/nfs/callback_xdr.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/nfs/callback_xdr.c b/fs/nfs/callback_xdr.c
> index 29c49a7e5fe1..246470306172 100644
> --- a/fs/nfs/callback_xdr.c
> +++ b/fs/nfs/callback_xdr.c
> @@ -118,7 +118,9 @@ static __be32 decode_bitmap(struct xdr_stream
> *xdr, uint32_t *bitmap)
>  	if (likely(attrlen > 0))
>  		bitmap[0] = ntohl(*p++);
>  	if (attrlen > 1)
> -		bitmap[1] = ntohl(*p);
> +		bitmap[1] = ntohl(*p++);
> +	if (attrlen > 2)
> +		bitmap[2] = ntohl(*p);
>  	return 0;
>  }
>  
> 
> ---
> base-commit: b311c1b497e51a628aa89e7cb954481e5f9dced2
> change-id: 20240821-nfs-6-11-188bb4e1f1dd
> 
> Best regards,

Why do we need this? I'm not really understanding which callback
attributes we'd want to return in that range.

-- 
Trond Myklebust
Linux NFS client maintainer, Hammerspace
trond.myklebust@xxxxxxxxxxxxxxx