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Message-ID: <ced58cba1234c662ddf7cfeaef5ce4b1a702dcfa.camel@kernel.org>
Subject: Re: [PATCH 5/9] nfsd: allow admin-revoked state to appear in
 /proc/fs/nfsd/clients/*/states
From:   Jeff Layton <jlayton@kernel.org>
To:     NeilBrown <neilb@suse.de>, Chuck Lever <chuck.lever@oracle.com>
Cc:     linux-nfs@vger.kernel.org, Olga Kornievskaia <kolga@netapp.com>,
        Dai Ngo <Dai.Ngo@oracle.com>, Tom Talpey <tom@talpey.com>
Date:   Fri, 17 Nov 2023 06:27:27 -0500
In-Reply-To: <20231117022121.23310-6-neilb@suse.de>
References: <20231117022121.23310-1-neilb@suse.de>
         <20231117022121.23310-6-neilb@suse.de>
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On Fri, 2023-11-17 at 13:18 +1100, NeilBrown wrote:
> Change the "show" functions to show some content even if a file cannot
> be found.
> This is primarily useful for debugging - to ensure states are being
> removed eventually.
>=20
> Signed-off-by: NeilBrown <neilb@suse.de>
> ---
>  fs/nfsd/nfs4state.c | 81 +++++++++++++++++++++++----------------------
>  1 file changed, 41 insertions(+), 40 deletions(-)
>=20
> diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
> index a2b3320a6ba8..8debd148840f 100644
> --- a/fs/nfsd/nfs4state.c
> +++ b/fs/nfsd/nfs4state.c
> @@ -2680,17 +2680,10 @@ static int nfs4_show_open(struct seq_file *s, str=
uct nfs4_stid *st)
>  	struct nfs4_stateowner *oo;
>  	unsigned int access, deny;
> =20
> -	if (st->sc_type !=3D NFS4_OPEN_STID && st->sc_type !=3D NFS4_LOCK_STID)
> -		return 0; /* XXX: or SEQ_SKIP? */
>  	ols =3D openlockstateid(st);
>  	oo =3D ols->st_stateowner;
>  	nf =3D st->sc_file;
> =20
> -	spin_lock(&nf->fi_lock);
> -	file =3D find_any_file_locked(nf);
> -	if (!file)
> -		goto out;
> -
>  	seq_printf(s, "- ");
>  	nfs4_show_stateid(s, &st->sc_stateid);
>  	seq_printf(s, ": { type: open, ");
> @@ -2705,14 +2698,19 @@ static int nfs4_show_open(struct seq_file *s, str=
uct nfs4_stid *st)
>  		deny & NFS4_SHARE_ACCESS_READ ? "r" : "-",
>  		deny & NFS4_SHARE_ACCESS_WRITE ? "w" : "-");
> =20
> -	nfs4_show_superblock(s, file);
> -	seq_printf(s, ", ");
> -	nfs4_show_fname(s, file);
> -	seq_printf(s, ", ");
> +	spin_lock(&nf->fi_lock);
> +	file =3D find_any_file_locked(nf);
> +	if (file) {
> +		nfs4_show_superblock(s, file);
> +		seq_puts(s, ", ");
> +		nfs4_show_fname(s, file);
> +		seq_puts(s, ", ");
> +	}
> +	spin_unlock(&nf->fi_lock);
>  	nfs4_show_owner(s, oo);
> +	if (st->sc_status & NFS4_STID_ADMIN_REVOKED)
> +		seq_puts(s, ", admin-revoked");
>  	seq_printf(s, " }\n");
> -out:
> -	spin_unlock(&nf->fi_lock);
>  	return 0;
>  }
> =20
> @@ -2726,30 +2724,31 @@ static int nfs4_show_lock(struct seq_file *s, str=
uct nfs4_stid *st)
>  	ols =3D openlockstateid(st);
>  	oo =3D ols->st_stateowner;
>  	nf =3D st->sc_file;
> -	spin_lock(&nf->fi_lock);
> -	file =3D find_any_file_locked(nf);
> -	if (!file)
> -		goto out;
> =20
>  	seq_printf(s, "- ");
>  	nfs4_show_stateid(s, &st->sc_stateid);
>  	seq_printf(s, ": { type: lock, ");
> =20
> -	/*
> -	 * Note: a lock stateid isn't really the same thing as a lock,
> -	 * it's the locking state held by one owner on a file, and there
> -	 * may be multiple (or no) lock ranges associated with it.
> -	 * (Same for the matter is true of open stateids.)
> -	 */
> +	spin_lock(&nf->fi_lock);
> +	file =3D find_any_file_locked(nf);
> +	if (file) {
> +		/*
> +		 * Note: a lock stateid isn't really the same thing as a lock,
> +		 * it's the locking state held by one owner on a file, and there
> +		 * may be multiple (or no) lock ranges associated with it.
> +		 * (Same for the matter is true of open stateids.)
> +		 */
> =20
> -	nfs4_show_superblock(s, file);
> -	/* XXX: open stateid? */
> -	seq_printf(s, ", ");
> -	nfs4_show_fname(s, file);
> -	seq_printf(s, ", ");
> +		nfs4_show_superblock(s, file);
> +		/* XXX: open stateid? */
> +		seq_puts(s, ", ");
> +		nfs4_show_fname(s, file);
> +		seq_puts(s, ", ");
> +	}
>  	nfs4_show_owner(s, oo);
> +	if (st->sc_status & NFS4_STID_ADMIN_REVOKED)
> +		seq_puts(s, ", admin-revoked");
>  	seq_printf(s, " }\n");
> -out:
>  	spin_unlock(&nf->fi_lock);
>  	return 0;
>  }
> @@ -2762,27 +2761,29 @@ static int nfs4_show_deleg(struct seq_file *s, st=
ruct nfs4_stid *st)
> =20
>  	ds =3D delegstateid(st);
>  	nf =3D st->sc_file;
> -	spin_lock(&nf->fi_lock);
> -	file =3D nf->fi_deleg_file;
> -	if (!file)
> -		goto out;
> =20
>  	seq_printf(s, "- ");
>  	nfs4_show_stateid(s, &st->sc_stateid);
>  	seq_printf(s, ": { type: deleg, ");
> =20
>  	/* Kinda dead code as long as we only support read delegs: */

nit: You can probably remove the above comment since we now support
write delegations.

> -	seq_printf(s, "access: %s, ",
> -		ds->dl_type =3D=3D NFS4_OPEN_DELEGATE_READ ? "r" : "w");
> +	seq_printf(s, "access: %s",
> +		   ds->dl_type =3D=3D NFS4_OPEN_DELEGATE_READ ? "r" : "w");
> =20
>  	/* XXX: lease time, whether it's being recalled. */
> =20
> -	nfs4_show_superblock(s, file);
> -	seq_printf(s, ", ");
> -	nfs4_show_fname(s, file);
> -	seq_printf(s, " }\n");
> -out:
> +	spin_lock(&nf->fi_lock);
> +	file =3D nf->fi_deleg_file;
> +	if (file) {
> +		seq_puts(s, ", ");
> +		nfs4_show_superblock(s, file);
> +		seq_puts(s, ", ");
> +		nfs4_show_fname(s, file);
> +	}
>  	spin_unlock(&nf->fi_lock);
> +	if (st->sc_status & NFS4_STID_ADMIN_REVOKED)
> +		seq_puts(s, ", admin-revoked");
> +	seq_puts(s, " }\n");
>  	return 0;
>  }
> =20

--=20
Jeff Layton <jlayton@kernel.org>