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[68.61.232.219]) by smtp.gmail.com with ESMTPSA id n9sm5512484qti.75.2020.11.23.12.09.15 for (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 23 Nov 2020 12:09:15 -0800 (PST) Sender: Chuck Lever Received: from klimt.1015granger.net (klimt.1015granger.net [192.168.1.55]) by gateway.1015granger.net (8.14.7/8.14.7) with ESMTP id 0ANK9Ew3010456 for ; Mon, 23 Nov 2020 20:09:14 GMT Subject: [PATCH v3 60/85] NFSD: Add a helper to decode channel_attrs4 From: Chuck Lever To: linux-nfs@vger.kernel.org Date: Mon, 23 Nov 2020 15:09:14 -0500 Message-ID: <160616215488.51996.10296408285780429558.stgit@klimt.1015granger.net> In-Reply-To: <160616177104.51996.14915419165992024951.stgit@klimt.1015granger.net> References: <160616177104.51996.14915419165992024951.stgit@klimt.1015granger.net> User-Agent: StGit/0.23-29-ga622f1 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org De-duplicate some code. Signed-off-by: Chuck Lever --- fs/nfsd/nfs4xdr.c | 71 ++++++++++++++++++++++++++++------------------------- 1 file changed, 38 insertions(+), 33 deletions(-) diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c index c74aa6203989..06de62f8185c 100644 --- a/fs/nfsd/nfs4xdr.c +++ b/fs/nfsd/nfs4xdr.c @@ -1614,6 +1614,38 @@ nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp, return nfsd4_decode_nfs_impl_id4(argp, exid); } +static __be32 +nfsd4_decode_channel_attrs4(struct nfsd4_compoundargs *argp, + struct nfsd4_channel_attrs *ca) +{ + __be32 *p; + + p = xdr_inline_decode(argp->xdr, XDR_UNIT * 7); + if (!p) + return nfserr_bad_xdr; + + /* headerpadsz is ignored */ + p++; + ca->maxreq_sz = be32_to_cpup(p++); + ca->maxresp_sz = be32_to_cpup(p++); + ca->maxresp_cached = be32_to_cpup(p++); + ca->maxops = be32_to_cpup(p++); + ca->maxreqs = be32_to_cpup(p++); + ca->nr_rdma_attrs = be32_to_cpup(p); + switch (ca->nr_rdma_attrs) { + case 0: + break; + case 1: + if (xdr_stream_decode_u32(argp->xdr, &ca->rdma_attrs) < 0) + return nfserr_bad_xdr; + break; + default: + return nfserr_bad_xdr; + } + + return nfs_ok; +} + static __be32 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp, struct nfsd4_create_session *sess) @@ -1625,39 +1657,12 @@ nfsd4_decode_create_session(struct nfsd4_compoundargs *argp, sess->seqid = be32_to_cpup(p++); sess->flags = be32_to_cpup(p++); - /* Fore channel attrs */ - READ_BUF(28); - p++; /* headerpadsz is always 0 */ - sess->fore_channel.maxreq_sz = be32_to_cpup(p++); - sess->fore_channel.maxresp_sz = be32_to_cpup(p++); - sess->fore_channel.maxresp_cached = be32_to_cpup(p++); - sess->fore_channel.maxops = be32_to_cpup(p++); - sess->fore_channel.maxreqs = be32_to_cpup(p++); - sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++); - if (sess->fore_channel.nr_rdma_attrs == 1) { - READ_BUF(4); - sess->fore_channel.rdma_attrs = be32_to_cpup(p++); - } else if (sess->fore_channel.nr_rdma_attrs > 1) { - dprintk("Too many fore channel attr bitmaps!\n"); - goto xdr_error; - } - - /* Back channel attrs */ - READ_BUF(28); - p++; /* headerpadsz is always 0 */ - sess->back_channel.maxreq_sz = be32_to_cpup(p++); - sess->back_channel.maxresp_sz = be32_to_cpup(p++); - sess->back_channel.maxresp_cached = be32_to_cpup(p++); - sess->back_channel.maxops = be32_to_cpup(p++); - sess->back_channel.maxreqs = be32_to_cpup(p++); - sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++); - if (sess->back_channel.nr_rdma_attrs == 1) { - READ_BUF(4); - sess->back_channel.rdma_attrs = be32_to_cpup(p++); - } else if (sess->back_channel.nr_rdma_attrs > 1) { - dprintk("Too many back channel attr bitmaps!\n"); - goto xdr_error; - } + status = nfsd4_decode_channel_attrs4(argp, &sess->fore_channel); + if (status) + return status; + status = nfsd4_decode_channel_attrs4(argp, &sess->back_channel); + if (status) + return status; READ_BUF(4); sess->callback_prog = be32_to_cpup(p++);