From mboxrd@z Thu Jan 1 00:00:00 1970 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=-2.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 80461C43334 for ; Mon, 3 Sep 2018 17:08:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 451FF20843 for ; Mon, 3 Sep 2018 17:08:05 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 451FF20843 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linuxfoundation.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729904AbeICV3D (ORCPT ); Mon, 3 Sep 2018 17:29:03 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:40286 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729078AbeICV3D (ORCPT ); Mon, 3 Sep 2018 17:29:03 -0400 Received: from localhost (ip-213-127-74-90.ip.prioritytelecom.net [213.127.74.90]) by mail.linuxfoundation.org (Postfix) with ESMTPSA id C2959BB3; Mon, 3 Sep 2018 17:08:00 +0000 (UTC) From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Miklos Szeredi Subject: [PATCH 4.9 077/107] fuse: umount should wait for all requests Date: Mon, 3 Sep 2018 18:56:41 +0200 Message-Id: <20180903165641.035204534@linuxfoundation.org> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20180903165637.293735109@linuxfoundation.org> References: <20180903165637.293735109@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Miklos Szeredi commit b8f95e5d13f5f0191dcb4b9113113d241636e7cb upstream. fuse_abort_conn() does not guarantee that all async requests have actually finished aborting (i.e. their ->end() function is called). This could actually result in still used inodes after umount. Add a helper to wait until all requests are fully done. This is done by looking at the "num_waiting" counter. When this counter drops to zero, we can be sure that no more requests are outstanding. Fixes: 0d8e84b0432b ("fuse: simplify request abort") Cc: # v4.2 Signed-off-by: Miklos Szeredi Signed-off-by: Greg Kroah-Hartman --- fs/fuse/dev.c | 23 +++++++++++++++++++---- fs/fuse/fuse_i.h | 1 + fs/fuse/inode.c | 2 ++ 3 files changed, 22 insertions(+), 4 deletions(-) --- a/fs/fuse/dev.c +++ b/fs/fuse/dev.c @@ -130,6 +130,16 @@ static bool fuse_block_alloc(struct fuse return !fc->initialized || (for_background && fc->blocked); } +static void fuse_drop_waiting(struct fuse_conn *fc) +{ + if (fc->connected) { + atomic_dec(&fc->num_waiting); + } else if (atomic_dec_and_test(&fc->num_waiting)) { + /* wake up aborters */ + wake_up_all(&fc->blocked_waitq); + } +} + static struct fuse_req *__fuse_get_req(struct fuse_conn *fc, unsigned npages, bool for_background) { @@ -170,7 +180,7 @@ static struct fuse_req *__fuse_get_req(s return req; out: - atomic_dec(&fc->num_waiting); + fuse_drop_waiting(fc); return ERR_PTR(err); } @@ -277,7 +287,7 @@ void fuse_put_request(struct fuse_conn * if (test_bit(FR_WAITING, &req->flags)) { __clear_bit(FR_WAITING, &req->flags); - atomic_dec(&fc->num_waiting); + fuse_drop_waiting(fc); } if (req->stolen_file) @@ -363,7 +373,7 @@ static void request_end(struct fuse_conn struct fuse_iqueue *fiq = &fc->iq; if (test_and_set_bit(FR_FINISHED, &req->flags)) - goto out_put_req; + goto put_request; spin_lock(&fiq->waitq.lock); list_del_init(&req->intr_entry); @@ -393,7 +403,7 @@ static void request_end(struct fuse_conn wake_up(&req->waitq); if (req->end) req->end(fc, req); -out_put_req: +put_request: fuse_put_request(fc, req); } @@ -2135,6 +2145,11 @@ void fuse_abort_conn(struct fuse_conn *f } EXPORT_SYMBOL_GPL(fuse_abort_conn); +void fuse_wait_aborted(struct fuse_conn *fc) +{ + wait_event(fc->blocked_waitq, atomic_read(&fc->num_waiting) == 0); +} + int fuse_dev_release(struct inode *inode, struct file *file) { struct fuse_dev *fud = fuse_get_dev(file); --- a/fs/fuse/fuse_i.h +++ b/fs/fuse/fuse_i.h @@ -854,6 +854,7 @@ void fuse_request_send_background_locked /* Abort all requests */ void fuse_abort_conn(struct fuse_conn *fc); +void fuse_wait_aborted(struct fuse_conn *fc); /** * Invalidate inode attributes --- a/fs/fuse/inode.c +++ b/fs/fuse/inode.c @@ -405,6 +405,8 @@ static void fuse_put_super(struct super_ fuse_send_destroy(fc); fuse_abort_conn(fc); + fuse_wait_aborted(fc); + mutex_lock(&fuse_mutex); list_del(&fc->entry); fuse_ctl_remove_conn(fc);