From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 09AB91AF4D3; Wed, 21 Aug 2024 18:39:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724265587; cv=none; b=A06RrodpZpcB+qU0PVHOqxUkjV0UcmyHM1r4rr/a1ye5YPnyMLA1qU+nK6Z39eLkLx/aN1rKW3F+132Witq1dRPNOGc8/ulycQW2ZL4QEb9Iaxs9ncRAReqY6GdedYkQBaQ9jOuSiiPdes/JMdLOjSdrxil4gHLXh2Hn2ZXYsNE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724265587; c=relaxed/simple; bh=0TE4ypNkiRqVZRNfeuV7vyxFpXI7eu4nVYiQHgckEdU=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=Mztd7Mg338tcesoWXHzSIeveuHMJVfse7mpBa3saKj/FfP4H0O/9BqFxmSRdokhpCwYzWHkAKKDsgwoCKGm7w2/aMUF6AOhdx0gKYDIIMc/pp+0GGzomPxEwbtI9WiYWtfSbF/bO7u9QA0FSSVI0DIYZbXqkxRf1CxRPM5Dte+0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=bWJepMeX; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="bWJepMeX" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D82B4C32781; Wed, 21 Aug 2024 18:39:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1724265586; bh=0TE4ypNkiRqVZRNfeuV7vyxFpXI7eu4nVYiQHgckEdU=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=bWJepMeXLocC0i/7dcN9wzpByVQ/wO9Y+dR0vkb7ob8YsJ5y/WYpCOrrpTnhCEx7Z HHlPehoBE9OEnOhSZP/p2g5kxFMh3qvSYZyn3g6pl5lOySnC7u3uwI/u2g65s2BKa7 +e2U1zMo6p+a+fNdsf3Me48M6FotsxESmDwXO8zWvmELJ2tq6U629O2uafgbFqmevO DxsHC7LeYQz4aS6BdxGPCYQBpJUQaH3q8bSjcut6YiXvux28LJS0JfOv0c0xBi9EAf fy69Y7fryDNMHu3Hqi4QuqH1ygK+EfvrjKUh4wNeElc5we9GvEhxUmV3+z8iVpRW64 lsoDQt3nOWl5w== Message-ID: Subject: Re: [PATCH v12 09/24] nfs_common: add NFS LOCALIO auxiliary protocol enablement From: Jeff Layton To: Mike Snitzer , linux-nfs@vger.kernel.org Cc: Chuck Lever , Anna Schumaker , Trond Myklebust , NeilBrown , linux-fsdevel@vger.kernel.org Date: Wed, 21 Aug 2024 14:39:44 -0400 In-Reply-To: <20240819181750.70570-10-snitzer@kernel.org> References: <20240819181750.70570-1-snitzer@kernel.org> <20240819181750.70570-10-snitzer@kernel.org> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV T2h6v8i8YqsATFPwO4nuiTmL6I40ZofxVd+9wdRI4Db8yUNA4ZSP2nqLcLtFjClYRBoJvRWvsv4lm 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2tAMJUvFTdDbfe3zKlPDTuVsyNsALBGclPLagJ5ZTP+Vp2irAN9uwBuacBOTtmOdz4ZN2tdvNgozz uxp4CHBDVzAslUi2idy+xpsp47DWPxYFIRP3M8QG/aNW052LaPc0cedYxp8+9eiVUNpxF4SiU4i9J DfX/sn9XcfoVZIxMpCRE750zvJvcCUz9HojsrMQ1NFc7MFT1z3MOW2/RlzPcog7xvR5ENPH19ojRD CHqumUHRry+RF0lH00clzX/W8OrQJZtoBPXv9ahka/Vp7kEulcBJr1cH5Wz/WprhsIM7U9pse1f1g Yy9YbXtWctUz8uvDR7shsQxAhX3qO7DilMtuGo1v97I/Kx4gXQ52syh/w6EBny71CZrOgD6kJwPVV AaM1LRC28muq91WCFhs/nzHozpbzcheyGtMUI2Ao4K6mnY+3zIuXPygZMFr9KXE6fF7HzKxKuZMJO aEZCiDOq0anx6FmOzs5E6Jqdpo/mtI8beK+BE7Va6ni7YrQlnT0i3vaTVMTiCThbqsB20VrbMjlhp f8lfK1XVNbRq/R7GZ9zHESlsa35ha60yd/j3pu5hT2xyy8krV8vGhHvnJ1XRMJBAB/UYb6FyC7S+m QZIQXVeAA+smfTT0tDrisj1U5x6ZB9b3nBg65kc= Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.52.4 (3.52.4-1.fc40) Precedence: bulk X-Mailing-List: linux-nfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Mon, 2024-08-19 at 14:17 -0400, Mike Snitzer wrote: > fs/nfs_common/nfslocalio.c provides interfaces that enable an NFS client > to generate a nonce (single-use UUID) and associated short-lived > nfs_uuid_t struct, register it with nfs_common for subsequent lookup and > verification by the NFS server and if matched the NFS server populates > members in the nfs_uuid_t struct. >=20 > nfs_common's nfs_uuids list is the basis for localio enablement, as such > it has members that point to nfsd memory for direct use by the client > (e.g. 'net' is the server's network namespace, through it the client can > access nn->nfsd_serv with proper rcu read access). >=20 > This commit adds all the nfs_client members required to implement > the entire localio feature (which depends on the LOCALIO protocol). >=20 > Signed-off-by: Mike Snitzer > --- > =C2=A0fs/nfs/client.c=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0 |=C2=A0 9 ++++ > =C2=A0fs/nfs_common/Makefile=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0 3 ++ > =C2=A0fs/nfs_common/nfslocalio.c | 97 +++++++++++++++++++++++++++++++++++= +++ > =C2=A0include/linux/nfs_fs_sb.h=C2=A0 | 10 ++++ > =C2=A0include/linux/nfslocalio.h | 37 +++++++++++++++ > =C2=A05 files changed, 156 insertions(+) > =C2=A0create mode 100644 fs/nfs_common/nfslocalio.c > =C2=A0create mode 100644 include/linux/nfslocalio.h >=20 > diff --git a/fs/nfs/client.c b/fs/nfs/client.c > index 8286edd6062d..1b65a5d7af49 100644 > --- a/fs/nfs/client.c > +++ b/fs/nfs/client.c > @@ -178,6 +178,15 @@ struct nfs_client *nfs_alloc_client(const struct nfs= _client_initdata *cl_init) > =C2=A0 clp->cl_max_connect =3D cl_init->max_connect ? cl_init->max_connec= t : 1; > =C2=A0 clp->cl_net =3D get_net(cl_init->net); > =C2=A0 > +#if IS_ENABLED(CONFIG_NFS_LOCALIO) > + seqlock_init(&clp->cl_boot_lock); > + ktime_get_real_ts64(&clp->cl_nfssvc_boot); > + clp->cl_rpcclient_localio =3D ERR_PTR(-EINVAL); > + clp->nfsd_open_local_fh =3D NULL; > + clp->cl_nfssvc_net =3D NULL; > + clp->cl_nfssvc_dom =3D NULL; > +#endif /* CONFIG_NFS_LOCALIO */ > + > =C2=A0 clp->cl_principal =3D "*"; > =C2=A0 clp->cl_xprtsec =3D cl_init->xprtsec; > =C2=A0 return clp; > diff --git a/fs/nfs_common/Makefile b/fs/nfs_common/Makefile > index e58b01bb8dda..a5e54809701e 100644 > --- a/fs/nfs_common/Makefile > +++ b/fs/nfs_common/Makefile > @@ -6,6 +6,9 @@ > =C2=A0obj-$(CONFIG_NFS_ACL_SUPPORT) +=3D nfs_acl.o > =C2=A0nfs_acl-objs :=3D nfsacl.o > =C2=A0 > +obj-$(CONFIG_NFS_COMMON_LOCALIO_SUPPORT) +=3D nfs_localio.o > +nfs_localio-objs :=3D nfslocalio.o > + > =C2=A0obj-$(CONFIG_GRACE_PERIOD) +=3D grace.o > =C2=A0obj-$(CONFIG_NFS_V4_2_SSC_HELPER) +=3D nfs_ssc.o > =C2=A0 > diff --git a/fs/nfs_common/nfslocalio.c b/fs/nfs_common/nfslocalio.c > new file mode 100644 > index 000000000000..a20ff7607707 > --- /dev/null > +++ b/fs/nfs_common/nfslocalio.c > @@ -0,0 +1,97 @@ > +// SPDX-License-Identifier: GPL-2.0-only > +/* > + * Copyright (C) 2024 Mike Snitzer > + */ > + > +#include > +#include > +#include > + > +MODULE_LICENSE("GPL"); > +MODULE_DESCRIPTION("NFS localio protocol bypass support"); > + > +DEFINE_MUTEX(nfs_uuid_mutex); > + > +/* > + * Global list of nfs_uuid_t instances, add/remove > + * is protected by nfs_uuid_mutex. > + * Reads are protected by RCU read lock (see below). > + */ > +LIST_HEAD(nfs_uuids); > + > +void nfs_uuid_begin(nfs_uuid_t *nfs_uuid) > +{ > + nfs_uuid->net =3D NULL; > + nfs_uuid->dom =3D NULL; > + uuid_gen(&nfs_uuid->uuid); > + > + mutex_lock(&nfs_uuid_mutex); > + list_add_tail_rcu(&nfs_uuid->list, &nfs_uuids); > + mutex_unlock(&nfs_uuid_mutex); > +} > +EXPORT_SYMBOL_GPL(nfs_uuid_begin); > + > +void nfs_uuid_end(nfs_uuid_t *nfs_uuid) > +{ > + mutex_lock(&nfs_uuid_mutex); > + list_del_rcu(&nfs_uuid->list); > + mutex_unlock(&nfs_uuid_mutex); > +} > +EXPORT_SYMBOL_GPL(nfs_uuid_end); > + > +/* Must be called with RCU read lock held. */ > +static nfs_uuid_t * nfs_uuid_lookup(const uuid_t *uuid) > +{ > + nfs_uuid_t *nfs_uuid; > + > + list_for_each_entry_rcu(nfs_uuid, &nfs_uuids, list) > + if (uuid_equal(&nfs_uuid->uuid, uuid)) > + return nfs_uuid; > + > + return NULL; > +} > + > +bool nfs_uuid_is_local(const uuid_t *uuid, struct net *net, struct auth_= domain *dom) > +{ > + bool is_local =3D false; > + nfs_uuid_t *nfs_uuid; > + > + rcu_read_lock(); > + nfs_uuid =3D nfs_uuid_lookup(uuid); > + if (nfs_uuid) { > + is_local =3D true; > + nfs_uuid->net =3D net; > + kref_get(&dom->ref); > + nfs_uuid->dom =3D dom; > + } > + rcu_read_unlock(); > + > + return is_local; > +} > +EXPORT_SYMBOL_GPL(nfs_uuid_is_local); > + > +/* > + * The nfs localio code needs to call into nfsd to do the filehandle -> = struct path > + * mapping, but cannot be statically linked, because that will make the = nfs module > + * depend on the nfsd module. > + * > + * Instead, do dynamic linking to the nfsd module (via nfs_common module= ). The > + * nfs_common module will only hold a reference on nfsd when localio is = in use. > + * This allows some sanity checking, like giving up on localio if nfsd i= sn't loaded. > + */ > + > +extern int nfsd_open_local_fh(struct net *, struct auth_domain *, struct= rpc_clnt *, > + const struct cred *, const struct nfs_fh *, > + const fmode_t, struct file **); > + BTW: this adds the above prototype, but the function itself isn't added until patch #10. > +nfs_to_nfsd_open_t get_nfsd_open_local_fh(void) > +{ > + return symbol_request(nfsd_open_local_fh); > +} > +EXPORT_SYMBOL_GPL(get_nfsd_open_local_fh); > + > +void put_nfsd_open_local_fh(void) > +{ > + symbol_put(nfsd_open_local_fh); > +} > +EXPORT_SYMBOL_GPL(put_nfsd_open_local_fh); > diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h > index 1df86ab98c77..3849cc2832f0 100644 > --- a/include/linux/nfs_fs_sb.h > +++ b/include/linux/nfs_fs_sb.h > @@ -8,6 +8,7 @@ > =C2=A0#include > =C2=A0#include > =C2=A0#include > +#include > =C2=A0 > =C2=A0#include > =C2=A0#include > @@ -125,6 +126,15 @@ struct nfs_client { > =C2=A0 struct net *cl_net; > =C2=A0 struct list_head pending_cb_stateids; > =C2=A0 struct rcu_head rcu; > + > +#if IS_ENABLED(CONFIG_NFS_LOCALIO) > + struct timespec64 cl_nfssvc_boot; > + seqlock_t cl_boot_lock; > + struct rpc_clnt * cl_rpcclient_localio; > + struct net * =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 cl_nfssvc_net; > + struct auth_domain * cl_nfssvc_dom; > + nfs_to_nfsd_open_t nfsd_open_local_fh; > +#endif /* CONFIG_NFS_LOCALIO */ > =C2=A0}; > =C2=A0 > =C2=A0/* > diff --git a/include/linux/nfslocalio.h b/include/linux/nfslocalio.h > new file mode 100644 > index 000000000000..109cb8534e3f > --- /dev/null > +++ b/include/linux/nfslocalio.h > @@ -0,0 +1,37 @@ > +/* SPDX-License-Identifier: GPL-2.0 */ > +/* > + * Copyright (C) 2024 Mike Snitzer > + */ > +#ifndef __LINUX_NFSLOCALIO_H > +#define __LINUX_NFSLOCALIO_H > + > +#include > +#include > +#include > +#include > +#include > +#include > + > +/* > + * Useful to allow a client to negotiate if localio > + * possible with its server. > + */ > +typedef struct { > + uuid_t uuid; > + struct list_head list; > + struct net *net; /* nfsd's network namespace */ > + struct auth_domain *dom; /* auth_domain for localio */ > +} nfs_uuid_t; > + > +void nfs_uuid_begin(nfs_uuid_t *); > +void nfs_uuid_end(nfs_uuid_t *); > +bool nfs_uuid_is_local(const uuid_t *, struct net *, struct auth_domain = *); > + > +typedef int (*nfs_to_nfsd_open_t)(struct net *, struct auth_domain *, st= ruct rpc_clnt *, > + const struct cred *, const struct nfs_fh *, > + const fmode_t, struct file **); > + > +nfs_to_nfsd_open_t get_nfsd_open_local_fh(void); > +void put_nfsd_open_local_fh(void); > + > +#endif=C2=A0 /* __LINUX_NFSLOCALIO_H */ --=20 Jeff Layton