Re: [PATCH] NFSD: MKNOD should return NFSERR_BADTYPE instead of NFSERR_INVAL

["J. Bruce Fields" <bfields@fieldses.org>]

And, applied.  I should see about sending a pull request Monday....--b.

On Fri, Oct 23, 2020 at 10:41:12AM -0400, Chuck Lever wrote:
> A late paragraph of RFC 1813 Section 3.3.11 states:
> 
> | ... if the server does not support the target type or the
> | target type is illegal, the error, NFS3ERR_BADTYPE, should
> | be returned. Note that NF3REG, NF3DIR, and NF3LNK are
> | illegal types for MKNOD.
> 
> The Linux NFS server incorrectly returns NFSERR_INVAL in these
> cases.
> 
> Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
> ---
>  fs/nfsd/nfs3proc.c |    6 +-----
>  1 file changed, 1 insertion(+), 5 deletions(-)
> 
> diff --git a/fs/nfsd/nfs3proc.c b/fs/nfsd/nfs3proc.c
> index 14468613d150..a633044b0dc1 100644
> --- a/fs/nfsd/nfs3proc.c
> +++ b/fs/nfsd/nfs3proc.c
> @@ -316,10 +316,6 @@ nfsd3_proc_mknod(struct svc_rqst *rqstp)
>  	fh_copy(&resp->dirfh, &argp->fh);
>  	fh_init(&resp->fh, NFS3_FHSIZE);
>  
> -	if (argp->ftype == 0 || argp->ftype >= NF3BAD) {
> -		resp->status = nfserr_inval;
> -		goto out;
> -	}
>  	if (argp->ftype == NF3CHR || argp->ftype == NF3BLK) {
>  		rdev = MKDEV(argp->major, argp->minor);
>  		if (MAJOR(rdev) != argp->major ||
> @@ -328,7 +324,7 @@ nfsd3_proc_mknod(struct svc_rqst *rqstp)
>  			goto out;
>  		}
>  	} else if (argp->ftype != NF3SOCK && argp->ftype != NF3FIFO) {
> -		resp->status = nfserr_inval;
> +		resp->status = nfserr_badtype;
>  		goto out;
>  	}
>  
>