Return-Path: Received: from mail-yk0-f182.google.com ([209.85.160.182]:35803 "EHLO mail-yk0-f182.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751831AbbHTLRg (ORCPT ); Thu, 20 Aug 2015 07:17:36 -0400 Received: by ykbi184 with SMTP id i184so33653846ykb.2 for ; Thu, 20 Aug 2015 04:17:35 -0700 (PDT) From: Jeff Layton To: bfields@fieldses.org Cc: linux-nfs@vger.kernel.org, hch@lst.de, kinglongmee@gmail.com Subject: [PATCH v3 09/20] sunrpc: add a new cache_detail operation for when a cache is flushed Date: Thu, 20 Aug 2015 07:17:09 -0400 Message-Id: <1440069440-27454-10-git-send-email-jeff.layton@primarydata.com> In-Reply-To: <1440069440-27454-1-git-send-email-jeff.layton@primarydata.com> References: <1440069440-27454-1-git-send-email-jeff.layton@primarydata.com> Sender: linux-nfs-owner@vger.kernel.org List-ID: 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 --- 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 03d3b4c92d9f..d1c10a978bb2 100644 --- a/include/linux/sunrpc/cache.h +++ b/include/linux/sunrpc/cache.h @@ -98,6 +98,7 @@ 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 4a2340a54401..60da9aa2bdc5 100644 --- a/net/sunrpc/cache.c +++ b/net/sunrpc/cache.c @@ -1451,6 +1451,9 @@ static ssize_t write_flush(struct file *file, const char __user *buf, cd->nextcheck = seconds_since_boot(); cache_flush(); + if (cd->flush) + cd->flush(); + *ppos += count; return count; } -- 2.4.3