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 5C3243E1217; Thu, 16 Apr 2026 17:35:49 +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=1776360949; cv=none; b=QgbKh0cYh8hBmI0ktMOijHxB8kec6KROrnz/EsJpHZVfHb0KMoxYIF92Uc6rxUXok+0kRwV5/nmIPUh+zjSpsEYfrf1b54NfF6sTY6K/C3hV+jmcYRxMr0c2wTkNwpQwIlB+AAEgRzLG4WRsMNIdgDRMilMUhBbNQL+JI/FMg0U= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776360949; c=relaxed/simple; bh=QsfWLs2tuIZnRN7M+rne4mPXGqyvfLmtMwoip+RYIUc=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=lqIHGjA+rwdRSMSOvEpo35+xmmuIT1z78vrx1zE2FQ0K1VBEegN/ne/9rbHNIr9k8RcGt0W59gvtbG/spyhKGcd1nAXtDWI6LK9rTCsaZlPgMw03qQ19+kvzrsOMMvgEVLiLNfROhaoBa5yj1KVTR8i0ed03zM7KpUAO99j2D14= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=e/wQMUsu; 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="e/wQMUsu" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 68D72C2BCC4; Thu, 16 Apr 2026 17:35:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1776360949; bh=QsfWLs2tuIZnRN7M+rne4mPXGqyvfLmtMwoip+RYIUc=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=e/wQMUsuskXBZ98o6z2QFzNbdA3ag9Yc7Qies23QVRFtvCqtTwLajdRH9hmLWz464 z8YMTdk2aq3B407nOdELZCOuNHnzo5fXX6M9ZnoYEhMEzbYTQ7WzZOZQdQ5P4Lw+Ur N/tsAzQG0O8wZ5ucQAy0X6GXKXN/NRrx15gjvaz3sQe7aFreWdrR9jXVJnSWMSMAn7 JEQAL80KJGsjkvHCIIo/Iuon+FSJiFF+rt+43chyREpSzLr9dcsFd62uqwCUimY54V MryRsDsPJ/WFPfvVRmnmlqreIYgk59qF/yQ72vlARu21OQyeD16hr63Deg2SDYqSSK wmhu19imjaKcA== From: Jeff Layton Date: Thu, 16 Apr 2026 10:35:15 -0700 Subject: [PATCH v2 14/28] nfsd: add callback encoding and decoding linkages for CB_NOTIFY Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260416-dir-deleg-v2-14-851426a550f6@kernel.org> References: <20260416-dir-deleg-v2-0-851426a550f6@kernel.org> In-Reply-To: <20260416-dir-deleg-v2-0-851426a550f6@kernel.org> To: Alexander Viro , Christian Brauner , Jan Kara , Chuck Lever , Alexander Aring , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Jonathan Corbet , Shuah Khan , NeilBrown , Olga Kornievskaia , Dai Ngo , Tom Talpey , Trond Myklebust , Anna Schumaker , Amir Goldstein Cc: Calum Mackay , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-nfs@vger.kernel.org, Jeff Layton X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=3990; i=jlayton@kernel.org; h=from:subject:message-id; bh=QsfWLs2tuIZnRN7M+rne4mPXGqyvfLmtMwoip+RYIUc=; b=owEBbQKS/ZANAwAKAQAOaEEZVoIVAcsmYgBp4R3lWI50JIKNRsFVx4AGjMwire3Z5S7gS9ph3 8YukROLAsWJAjMEAAEKAB0WIQRLwNeyRHGyoYTq9dMADmhBGVaCFQUCaeEd5QAKCRAADmhBGVaC FXacD/4hDjhdSY++v+l4oCKXP9p0GHe7MfC8JrOE8cDCVXkJjYVLrhvfAZByA5xL6OwqLiohyR3 iKy0B//wV0vxrgKFClkwh/CNTolE5XO+v2NxKSdTeqaYFR4DlK4ysV8o4s5jilHzqVYqwubvZ6I ENIURQPAg+LuZ8euqCuBqa2tu4KA6Sr+OI8euvNHkTJVGENMCir5B2AqIKRowU1qUUSzFLgpare 2g6owzSbouvriWFANBJFnVea3FlBNRIvz9P2vezywTP5OiuW1TwQl7sE+O+41aUbzhsjeW4FMpi QiLImxkY5gEsHOA4hG6xY/ggtcyN1sMacnbkMdlORT5Tt/YlVSriYrLfL7p18USwdnR09FeUYJf CWhWxK+FuzrjtI1kSos4S9zNUonCQAifBzrH8TD3qzMaLbhCmvKqmFO4YCZZi0reUrbvXiXNsb9 l9/P451N37NYkauOava2Fc9hAMyGcziXxqedlI5TCznZ+ktBYssLLcLZHPmHCzfcKYdCJ8x+hRc I/57BryVe/17acFj4Lui/c1vzJVnkWVqk9X8zG/ECsOY/gTdL/WGMaF4FQu9GZN4RAQdRTQ1OV7 lgWO6O0zm9yq0+UwQkvARkkAuSbwuDhwA3RF18tZcz0gdt5OxQGJGkWjpvAI7FCb0WoqcwTw9i8 9HjLw7QpCrAFE8g== X-Developer-Key: i=jlayton@kernel.org; a=openpgp; fpr=4BC0D7B24471B2A184EAF5D3000E684119568215 Add routines for encoding and decoding CB_NOTIFY messages. These call into the code generated by xdrgen to do the actual encoding and decoding. Signed-off-by: Jeff Layton --- fs/nfsd/nfs4callback.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++ fs/nfsd/state.h | 8 ++++++++ fs/nfsd/xdr4cb.h | 12 ++++++++++++ 3 files changed, 66 insertions(+) diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c index 25bbf5b8814d..ea3e7deb06fa 100644 --- a/fs/nfsd/nfs4callback.c +++ b/fs/nfsd/nfs4callback.c @@ -865,6 +865,51 @@ static void encode_stateowner(struct xdr_stream *xdr, struct nfs4_stateowner *so xdr_encode_opaque(p, so->so_owner.data, so->so_owner.len); } +static void nfs4_xdr_enc_cb_notify(struct rpc_rqst *req, + struct xdr_stream *xdr, + const void *data) +{ + const struct nfsd4_callback *cb = data; + struct nfs4_cb_compound_hdr hdr = { + .ident = 0, + .minorversion = cb->cb_clp->cl_minorversion, + }; + struct CB_NOTIFY4args args = { }; + + WARN_ON_ONCE(hdr.minorversion == 0); + + encode_cb_compound4args(xdr, &hdr); + encode_cb_sequence4args(xdr, cb, &hdr); + + /* + * FIXME: get stateid and fh from delegation. Inline the cna_changes + * buffer, and zero it. + */ + WARN_ON_ONCE(!xdrgen_encode_CB_NOTIFY4args(xdr, &args)); + + hdr.nops++; + encode_cb_nops(&hdr); +} + +static int nfs4_xdr_dec_cb_notify(struct rpc_rqst *rqstp, + struct xdr_stream *xdr, + void *data) +{ + struct nfsd4_callback *cb = data; + struct nfs4_cb_compound_hdr hdr; + int status; + + status = decode_cb_compound4res(xdr, &hdr); + if (unlikely(status)) + return status; + + status = decode_cb_sequence4res(xdr, cb); + if (unlikely(status || cb->cb_seq_status)) + return status; + + return decode_cb_op_status(xdr, OP_CB_NOTIFY, &cb->cb_status); +} + static void nfs4_xdr_enc_cb_notify_lock(struct rpc_rqst *req, struct xdr_stream *xdr, const void *data) @@ -1026,6 +1071,7 @@ static const struct rpc_procinfo nfs4_cb_procedures[] = { #ifdef CONFIG_NFSD_PNFS PROC(CB_LAYOUT, COMPOUND, cb_layout, cb_layout), #endif + PROC(CB_NOTIFY, COMPOUND, cb_notify, cb_notify), PROC(CB_NOTIFY_LOCK, COMPOUND, cb_notify_lock, cb_notify_lock), PROC(CB_OFFLOAD, COMPOUND, cb_offload, cb_offload), PROC(CB_RECALL_ANY, COMPOUND, cb_recall_any, cb_recall_any), diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h index 7d2afe7dcc3e..22c9a1e7d8fd 100644 --- a/fs/nfsd/state.h +++ b/fs/nfsd/state.h @@ -190,6 +190,13 @@ struct nfs4_cb_fattr { u64 ncf_cur_fsize; }; +/* + * FIXME: the current backchannel encoder can't handle a send buffer longer + * than a single page (see bc_alloc/bc_free). + */ +#define NOTIFY4_EVENT_QUEUE_SIZE 3 +#define NOTIFY4_PAGE_ARRAY_SIZE 1 + /* * Represents a delegation stateid. The nfs4_client holds references to these * and they are put when it is being destroyed or when the delegation is @@ -774,6 +781,7 @@ enum nfsd4_cb_op { NFSPROC4_CLNT_CB_NOTIFY_LOCK, NFSPROC4_CLNT_CB_RECALL_ANY, NFSPROC4_CLNT_CB_GETATTR, + NFSPROC4_CLNT_CB_NOTIFY, }; /* Returns true iff a is later than b: */ diff --git a/fs/nfsd/xdr4cb.h b/fs/nfsd/xdr4cb.h index f4e29c0c701c..b06d0170d7c4 100644 --- a/fs/nfsd/xdr4cb.h +++ b/fs/nfsd/xdr4cb.h @@ -33,6 +33,18 @@ cb_sequence_dec_sz + \ op_dec_sz) +#define NFS4_enc_cb_notify_sz (cb_compound_enc_hdr_sz + \ + cb_sequence_enc_sz + \ + 1 + enc_stateid_sz + \ + enc_nfs4_fh_sz + \ + 1 + \ + NOTIFY4_EVENT_QUEUE_SIZE * \ + (2 + (NFS4_OPAQUE_LIMIT >> 2))) + +#define NFS4_dec_cb_notify_sz (cb_compound_dec_hdr_sz + \ + cb_sequence_dec_sz + \ + op_dec_sz) + #define NFS4_enc_cb_notify_lock_sz (cb_compound_enc_hdr_sz + \ cb_sequence_enc_sz + \ 2 + 1 + \ -- 2.53.0