netdev - [PATCH RFC 13/24] nfsd: check for delegation conflicts vs. the same client

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Message-Id: <20240315-dir-deleg-v1-13-a1d6209a3654@kernel.org>
Date: Fri, 15 Mar 2024 12:53:04 -0400
From: Jeff Layton <jlayton@...nel.org>
To: Alexander Viro <viro@...iv.linux.org.uk>, 
 Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>, 
 Chuck Lever <chuck.lever@...cle.com>, 
 Alexander Aring <alex.aring@...il.com>, 
 Trond Myklebust <trond.myklebust@...merspace.com>, 
 Anna Schumaker <anna@...nel.org>, Steve French <sfrench@...ba.org>, 
 Paulo Alcantara <pc@...guebit.com>, 
 Ronnie Sahlberg <ronniesahlberg@...il.com>, 
 Shyam Prasad N <sprasad@...rosoft.com>, Tom Talpey <tom@...pey.com>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 "Rafael J. Wysocki" <rafael@...nel.org>, 
 David Howells <dhowells@...hat.com>, Tyler Hicks <code@...icks.com>, 
 Neil Brown <neilb@...e.de>, Olga Kornievskaia <kolga@...app.com>, 
 Dai Ngo <Dai.Ngo@...cle.com>, Miklos Szeredi <miklos@...redi.hu>, 
 Amir Goldstein <amir73il@...il.com>, Namjae Jeon <linkinjeon@...nel.org>, 
 Sergey Senozhatsky <senozhatsky@...omium.org>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Cc: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-nfs@...r.kernel.org, linux-cifs@...r.kernel.org, 
 samba-technical@...ts.samba.org, netfs@...ts.linux.dev, 
 ecryptfs@...r.kernel.org, linux-unionfs@...r.kernel.org, 
 netdev@...r.kernel.org, Jeff Layton <jlayton@...nel.org>
Subject: [PATCH RFC 13/24] nfsd: check for delegation conflicts vs. the
 same client

RFC 8881 requires that the server reply with GDD_UNAVAIL when the client
requests a directory delegation that it already holds.

When setting a directory delegation, check that the client assocated
with the stateid doesn't match an existing delegation. If it does,
reject the setlease attempt.

Signed-off-by: Jeff Layton <jlayton@...nel.org>
---
 fs/nfsd/nfs4state.c | 29 ++++++++++++++++++++++++++++-
 1 file changed, 28 insertions(+), 1 deletion(-)

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index c52e807f9672..778c1c6e3b54 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -88,6 +88,7 @@ void nfsd4_end_grace(struct nfsd_net *nn);
 static void _free_cpntf_state_locked(struct nfsd_net *nn, struct nfs4_cpntf_state *cps);
 static void nfsd4_file_hash_remove(struct nfs4_file *fi);
 static void deleg_reaper(struct nfsd_net *nn);
+static bool nfsd_dir_deleg_conflict(struct file_lease *new, struct file_lease *old);

 /* Locking: */

@@ -5262,6 +5263,31 @@ static const struct lease_manager_operations nfsd_lease_mng_ops = {
 	.lm_change = nfsd_change_deleg_cb,
 };

+static const struct lease_manager_operations nfsd_dir_lease_mng_ops = {
+	.lm_breaker_owns_lease = nfsd_breaker_owns_lease,
+	.lm_break = nfsd_break_deleg_cb,
+	.lm_change = nfsd_change_deleg_cb,
+	.lm_set_conflict = nfsd_dir_deleg_conflict,
+};
+
+static bool
+nfsd_dir_deleg_conflict(struct file_lease *new, struct file_lease *old)
+{
+	struct nfs4_delegation *od, *nd;
+
+	/* Only conflicts with other nfsd dir delegs */
+	if (old->fl_lmops != &nfsd_dir_lease_mng_ops)
+		return false;
+
+	od = old->c.flc_owner;
+	nd = new->c.flc_owner;
+
+	/* Are these for the same client? No bueno if so */
+	if (od->dl_stid.sc_client == nd->dl_stid.sc_client)
+		return true;
+	return false;
+}
+
 static __be32 nfsd4_check_seqid(struct nfsd4_compound_state *cstate, struct nfs4_stateowner *so, u32 seqid)
 {
 	if (nfsd4_has_session(cstate))
@@ -5609,12 +5635,13 @@ static struct file_lease *nfs4_alloc_init_lease(struct nfs4_delegation *dp,
 	fl = locks_alloc_lease();
 	if (!fl)
 		return NULL;
-	fl->fl_lmops = &nfsd_lease_mng_ops;
 	fl->c.flc_flags = FL_DELEG;
 	fl->c.flc_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
 	fl->c.flc_owner = (fl_owner_t)dp;
 	fl->c.flc_pid = current->tgid;
 	fl->c.flc_file = dp->dl_stid.sc_file->fi_deleg_file->nf_file;
+	fl->fl_lmops = S_ISDIR(file_inode(fl->c.flc_file)->i_mode) ?
+				&nfsd_dir_lease_mng_ops : &nfsd_lease_mng_ops;
 	return fl;
 }

-- 
2.44.0