From patchwork Tue Aug 31 19:05:22 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chuck Lever III X-Patchwork-Id: 12467697 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3E948C4320A for ; Tue, 31 Aug 2021 19:05:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2499C61074 for ; Tue, 31 Aug 2021 19:05:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240264AbhHaTGX (ORCPT ); Tue, 31 Aug 2021 15:06:23 -0400 Received: from mail.kernel.org ([198.145.29.99]:34666 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240163AbhHaTGS (ORCPT ); Tue, 31 Aug 2021 15:06:18 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id B157161041; Tue, 31 Aug 2021 19:05:22 +0000 (UTC) Subject: [PATCH RFC 2/6] SUNRPC: xdr_stream_subsegment() must handle non-zero page_bases From: Chuck Lever To: bfields@fieldses.org Cc: linux-nfs@vger.kernel.org, linux-rdma@vger.kernel.org Date: Tue, 31 Aug 2021 15:05:22 -0400 Message-ID: <163043672202.1415.7895822540426489041.stgit@klimt.1015granger.net> In-Reply-To: <163043485613.1415.4979286233971984855.stgit@klimt.1015granger.net> References: <163043485613.1415.4979286233971984855.stgit@klimt.1015granger.net> User-Agent: StGit/1.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org xdr_stream_subsegment() was introduced in commit c1346a1216ab ("NFSD: Replace the internals of the READ_BUF() macro"). There are two call sites for xdr_stream_subsegment(). One is nfsd4_decode_write(), and the other is nfsd4_decode_setxattr(). Currently neither of these call sites calls this API when xdr_buf::page_base is a non-zero value. However, I'm about to add a case where page_base will sometimes not be zero when nfsd4_decode_write() invokes this API. Replace the logic in xdr_stream_subsegment() that advances to the next data item in the xdr_stream with something more generic in order to handle this new use case. Signed-off-by: Chuck Lever --- net/sunrpc/xdr.c | 32 +++++++++++++++++--------------- 1 file changed, 17 insertions(+), 15 deletions(-) diff --git a/net/sunrpc/xdr.c b/net/sunrpc/xdr.c index ca10ba2626f2..df194cc07035 100644 --- a/net/sunrpc/xdr.c +++ b/net/sunrpc/xdr.c @@ -1633,7 +1633,7 @@ EXPORT_SYMBOL_GPL(xdr_buf_subsegment); * Sets up @subbuf to represent a portion of @xdr. The portion * starts at the current offset in @xdr, and extends for a length * of @nbytes. If this is successful, @xdr is advanced to the next - * position following that portion. + * XDR data item following that portion. * * Return values: * %true: @subbuf has been initialized, and @xdr has been advanced. @@ -1642,29 +1642,31 @@ EXPORT_SYMBOL_GPL(xdr_buf_subsegment); bool xdr_stream_subsegment(struct xdr_stream *xdr, struct xdr_buf *subbuf, unsigned int nbytes) { - unsigned int remaining, offset, len; + unsigned int start = xdr_stream_pos(xdr); + unsigned int remaining, len; - if (xdr_buf_subsegment(xdr->buf, subbuf, xdr_stream_pos(xdr), nbytes)) + /* Extract @subbuf and bounds-check the fn arguments */ + if (xdr_buf_subsegment(xdr->buf, subbuf, start, nbytes)) return false; - if (subbuf->head[0].iov_len) - if (!__xdr_inline_decode(xdr, subbuf->head[0].iov_len)) - return false; - - remaining = subbuf->page_len; - offset = subbuf->page_base; - while (remaining) { - len = min_t(unsigned int, remaining, PAGE_SIZE) - offset; - + /* Advance @xdr by @nbytes */ + for (remaining = nbytes; remaining;) { if (xdr->p == xdr->end && !xdr_set_next_buffer(xdr)) return false; - if (!__xdr_inline_decode(xdr, len)) - return false; + len = (char *)xdr->end - (char *)xdr->p; + if (remaining <= len) { + xdr->p = (__be32 *)((char *)xdr->p + + (remaining + xdr_pad_size(nbytes))); + break; + } + + xdr->p = (__be32 *)((char *)xdr->p + len); + xdr->end = xdr->p; remaining -= len; - offset = 0; } + xdr_stream_set_pos(xdr, start + nbytes); return true; } EXPORT_SYMBOL_GPL(xdr_stream_subsegment);