Re: [PATCH v2 01/14] nfsd: honour client-provided attributes for NFS4_CREATE_EXCLUSIVE4_1

[Jeff Layton <jlayton@kernel.org>]

On Mon, 2026-07-06 at 08:19 +1000, NeilBrown wrote:
> From: NeilBrown <neil@brown.name>
> 
> When a file is created with a v4.1 OPEN which requests
> NFS4_CREATE_EXCLUSIVE4_1, the request can include attributes to be set.
> However when the mtime/atime are set to hold the verifier, the other
> ia_valid flags are cleared, so no attributes requested by the client are
> used.
> 
> This code was originally written for NFSv3 where NFS3_CREATE_EXCLUSIVE
> never includes attributes.  When it was updated for v4.1, the fact that an
> exclusive create CAN include attributes was not handled properly.
> 
> Fixes: ac6721a13e5b ("nfsd41: make sure nfs server process OPEN with EXCLUSIVE4_1 correctly")
> Signed-off-by: NeilBrown <neil@brown.name>
> ---
>  fs/nfsd/nfs4proc.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
> index 669896be08b6..f8afc356809e 100644
> --- a/fs/nfsd/nfs4proc.c
> +++ b/fs/nfsd/nfs4proc.c
> @@ -393,8 +393,8 @@ nfsd4_create_file(struct svc_rqst *rqstp, struct svc_fh *fhp,
>  	if ((iap->ia_valid & ATTR_SIZE) && (iap->ia_size == 0))
>  		iap->ia_valid &= ~ATTR_SIZE;
>  	if (nfsd4_create_is_exclusive(open->op_createmode)) {
> -		iap->ia_valid = ATTR_MTIME | ATTR_ATIME |
> -				ATTR_MTIME_SET|ATTR_ATIME_SET;
> +		iap->ia_valid |= ATTR_MTIME | ATTR_ATIME |
> +				 ATTR_MTIME_SET|ATTR_ATIME_SET;
>  		iap->ia_mtime.tv_sec = v_mtime;
>  		iap->ia_atime.tv_sec = v_atime;
>  		iap->ia_mtime.tv_nsec = 0;

Nice catch. I wonder what we've been missing (if anything) all this
time?

Reviewed-by: Jeff Layton <jlayton@kernel.org>