From patchwork Fri Mar 15 16:53:04 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeffrey Layton X-Patchwork-Id: 13593773 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 C036B5C5FA; Fri, 15 Mar 2024 16:53:48 +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=1710521628; cv=none; b=pSOXeylz3F/ml+QLXo/AQbYeu6TnahU1mOq6hN6ejboRNF+I0rpc0GS+kyHJF/4p5p63Cfmhv/EHhqQh9XrcSMz7atVZIkS+FRw9F8OChWL6XXfcjfPrM+Wpfche9jW/kJu1MDmuCjYUn7VDSlfXh0Q7fubuTXX1l9wEKDbmz5I= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710521628; c=relaxed/simple; bh=ljfAQPv8SeghXncJudqqzHNlIKkPlPHDHVqidwfmElY=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=aFTei/07zszNDXX/2uA8/9EoLlhTLoAzk9M76EZKL69SbOqJRXaEN+dxc/dRKuKyJkO83MLSqAvUVgBU06NXNEGNnB2ViaGK3KA73a+c2y3d/4bA885vZT5CAuRjA2RVPyYPVGvo6Jk/PU/dJz+oo1Ppps9mRFxYMB2QXm1lGfw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=L5OVqFXM; 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="L5OVqFXM" Received: by smtp.kernel.org (Postfix) with ESMTPSA id AE1D3C43601; Fri, 15 Mar 2024 16:53:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1710521628; bh=ljfAQPv8SeghXncJudqqzHNlIKkPlPHDHVqidwfmElY=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=L5OVqFXMG3yzOuJfCE3MrXJQ+Mf1tkLr7lCvot4eRiRHsH7ZpVLRjuL9QGV6ZI7cg mIjwvBTcY9/Cyk2wshFhjwGgFvWSd2hPtiEgGc0Vbug/YmaiY+oqmY9tWN3oZNnETY LxTEwkJvxl95xaXQpYvvhUn6ikNacD1y2a+18MUObH1TLh+lhIbp0E8GLisBjHN1Tv NEtO3ThsBCc4y/rtGaKCuPKNTMHcDRM8ccp8G0nggVB4d95cENDC0cZhvNqHnbvoBX K0JzYY1ujVM38K+nosFbuhRtDFucDJqnI9jPY9ScwIt7moGd6jvmGT9698cdSzubSU Gy6m3N//1dcpw== From: Jeff Layton Date: Fri, 15 Mar 2024 12:53:04 -0400 Subject: [PATCH RFC 13/24] nfsd: check for delegation conflicts vs. the same client Precedence: bulk X-Mailing-List: linux-cifs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240315-dir-deleg-v1-13-a1d6209a3654@kernel.org> References: <20240315-dir-deleg-v1-0-a1d6209a3654@kernel.org> In-Reply-To: <20240315-dir-deleg-v1-0-a1d6209a3654@kernel.org> To: Alexander Viro , Christian Brauner , Jan Kara , Chuck Lever , Alexander Aring , Trond Myklebust , Anna Schumaker , Steve French , Paulo Alcantara , Ronnie Sahlberg , Shyam Prasad N , Tom Talpey , Greg Kroah-Hartman , "Rafael J. Wysocki" , David Howells , Tyler Hicks , Neil Brown , Olga Kornievskaia , Dai Ngo , Miklos Szeredi , Amir Goldstein , Namjae Jeon , Sergey Senozhatsky , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, linux-cifs@vger.kernel.org, samba-technical@lists.samba.org, netfs@lists.linux.dev, ecryptfs@vger.kernel.org, linux-unionfs@vger.kernel.org, netdev@vger.kernel.org, Jeff Layton X-Mailer: b4 0.12.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=2577; i=jlayton@kernel.org; h=from:subject:message-id; bh=ljfAQPv8SeghXncJudqqzHNlIKkPlPHDHVqidwfmElY=; b=owEBbQKS/ZANAwAIAQAOaEEZVoIVAcsmYgBl9HzuZG1C9GcHSunh24sr9Db67Qw+SIGDz0sjv OWi/9rr9/iJAjMEAAEIAB0WIQRLwNeyRHGyoYTq9dMADmhBGVaCFQUCZfR87gAKCRAADmhBGVaC FXTJD/9h2vD0EFl2BzLQ11an322nL8117C5bpnqClsrmJl4Co0TnaVOG3vyTMAwK8por1WAasN6 k+/1POyLZn1bTc3w5Byzzs88DNhDufzBiPwzCkW6gKjXeP9oVfa/n1IKvfX7Qz3t0wmnW0r2RZk HOUT30c/9BbcXqAKzvQpKZeSuX3dhVdDnAjKkVP0FdYW1eFrKdxfwN6Y8j1NtrS7FF9UIBc4Ut+ csrRXoz2zY25GyTNYKA1lMxLsQHIBXUqmuPNH5FnvTji/saxVFG95ExoKLoglL1mzGmXTLefHig LU+IbRvgKm1v3rdwBJsFhazvJRL9ww3P1y0+nfZ6BxzZdRSjlTIoJQ/VkxcHk3Dvmt4gZr1DHLp WHUU6EH69V9V9p/kBYTBck8w9RfeaLZha+6KiYsRa+OjBDpvYv3MX7Fdj7Jtp7DAs9NSxGjhHzl TnU6Rz5CJYrfxoQcO9GnOSlp+ygAbKmTwkXwzyCYH4TtszXO3/42S0R9Ig9EK/3ORlh9efM+K9j jxIjwDLYlbguoNwyc0WxwJr0TEmzL3z3IR29gs6ag9WEjr3wFpQSDPtoNTFqdyZBAYu5aCMnsGW t/boh7DvKk63x1DAkDq+ibjEyFMUr6jAe+sF2CTZ0iJFaAXCqr11RzrjWeNGWpThMUo5vZN1wTF ag5O22Ysl6sEYdQ== X-Developer-Key: i=jlayton@kernel.org; a=openpgp; fpr=4BC0D7B24471B2A184EAF5D3000E684119568215 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 --- 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; }