From patchwork Sun Jun 30 13:52:25 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Trond Myklebust X-Patchwork-Id: 11024343 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 9F1E41398 for ; Sun, 30 Jun 2019 13:54:53 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 91C682863C for ; Sun, 30 Jun 2019 13:54:53 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 8627F28725; Sun, 30 Jun 2019 13:54:53 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FROM,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2B8392863C for ; Sun, 30 Jun 2019 13:54:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726547AbfF3Nyw (ORCPT ); Sun, 30 Jun 2019 09:54:52 -0400 Received: from mail-io1-f65.google.com ([209.85.166.65]:33077 "EHLO mail-io1-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726500AbfF3Nyw (ORCPT ); Sun, 30 Jun 2019 09:54:52 -0400 Received: by mail-io1-f65.google.com with SMTP id u13so22795175iop.0; Sun, 30 Jun 2019 06:54:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=uJQISiYeBNw/ErwgBXjdG4575zJj77MOUucRMpWDu8E=; b=Amx+zs+jqxuwfnOy7YTys1WQvbm1ORqiNaeYZ0+/JH0wvFBJtcT2+s3nkqOn2EghzP 7vBkjVnNqHd6FkTcq7pRrerdIKu0xeP5nI8F+auISQob4e6WXulgGIfdhhGYn1BjSljb fnAMd37SUI5L5SdzCfZZ/Pm5Hk2farLvH2frfh4ccOTEfANbdgAcdodajMrYim4KqxO1 BBBzIHxy2BmqZsyJ7h9sykLRC7JRa4N0ivRNWQgMcgH+0DtP9sFnjYgDsbprdYzksj+O Qui7DlJG1KLhobUvJl7jQfRtWBNPzH+m8kf0QCXnSilgO5rO+qMEKyOQqOSalF3pjkWq +gDA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=uJQISiYeBNw/ErwgBXjdG4575zJj77MOUucRMpWDu8E=; b=m39uJFsm2elcz9WRF8+gu3q663mEiJS2upOXfl6fbLz3Bn2TMYrIB+XWqCii9Au6+v E6mHHVEVgI2zbDdunkjovXO6zI2bHVnpaPyz/o9DLdHtXZQMGBZHxg3VNBt7Zpbmz9QG 4QoE0GlPYN0mHT9UeoutNKKYzPYHYkA03i53zQgWFbnpxpseITEntS7NOD4kwZi8TAya 2VXuCyIiZCpVD+2rj40fSv+whHDuzXkbbU4rxMRedytO8O9N/LBM4xneFKteBiUiyd1h G2J9ySDHW7Y7ske0dWYMlLhrbivJ80yLMJOjI1eg+pwbkh2OInSpBVAzA6Bm85QgGJs1 5PJA== X-Gm-Message-State: APjAAAVRL7ZBExTamUPcxszQEFy3LZG3TGFIl1+JdQf2JfxE0TgB673+ cyR64B5Y4trMKSjIhXFoQw== X-Google-Smtp-Source: APXvYqyk3S1cpCQT1HOJYwqr5nnu/XjZIYzoTGMLa4TWX74+2XMPWP69Qz8LgFkUCR+E2nWWQ6KmSA== X-Received: by 2002:a02:c885:: with SMTP id m5mr22837003jao.101.1561902890491; Sun, 30 Jun 2019 06:54:50 -0700 (PDT) Received: from localhost.localdomain (50-124-245-189.alma.mi.frontiernet.net. [50.124.245.189]) by smtp.gmail.com with ESMTPSA id z17sm11930378iol.73.2019.06.30.06.54.48 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Sun, 30 Jun 2019 06:54:49 -0700 (PDT) From: Trond Myklebust X-Google-Original-From: Trond Myklebust To: "J. Bruce Fields" , Chuck Lever Cc: Jeff Layton , linux-nfs@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: [PATCH 01/16] sunrpc: add a new cache_detail operation for when a cache is flushed Date: Sun, 30 Jun 2019 09:52:25 -0400 Message-Id: <20190630135240.7490-2-trond.myklebust@hammerspace.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190630135240.7490-1-trond.myklebust@hammerspace.com> References: <20190630135240.7490-1-trond.myklebust@hammerspace.com> MIME-Version: 1.0 Sender: linux-nfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Jeff Layton When the exports table is changed, exportfs will usually write a new time to the "flush" file in the nfsd.export cache procfile. This tells the kernel to flush any entries that are older than that value. This gives us a mechanism to tell whether an unexport might have occurred. Add a new ->flush cache_detail operation that is called after flushing the cache whenever someone writes to a "flush" file. Signed-off-by: Jeff Layton Signed-off-by: Trond Myklebust Signed-off-by: Trond Myklebust --- include/linux/sunrpc/cache.h | 1 + net/sunrpc/cache.c | 3 +++ 2 files changed, 4 insertions(+) diff --git a/include/linux/sunrpc/cache.h b/include/linux/sunrpc/cache.h index c7f38e897174..dfa3ab97564a 100644 --- a/include/linux/sunrpc/cache.h +++ b/include/linux/sunrpc/cache.h @@ -87,6 +87,7 @@ struct cache_detail { int has_died); struct cache_head * (*alloc)(void); + void (*flush)(void); int (*match)(struct cache_head *orig, struct cache_head *new); void (*init)(struct cache_head *orig, struct cache_head *new); void (*update)(struct cache_head *orig, struct cache_head *new); diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c index 66fbb9d2fba7..195b46a4a512 100644 --- a/net/sunrpc/cache.c +++ b/net/sunrpc/cache.c @@ -1521,6 +1521,9 @@ static ssize_t write_flush(struct file *file, const char __user *buf, cd->nextcheck = now; cache_flush(); + if (cd->flush) + cd->flush(); + *ppos += count; return count; }