From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C21AD746F for ; Sun, 17 Sep 2023 20:36:06 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2D6ADC433C8; Sun, 17 Sep 2023 20:36:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1694982966; bh=civgUsj0Kvz6jeBR1mRZNjwpoZHGpmoF59hSYxzYcPk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Chu3NaY1ZuSygIr+FKE4Ue5YU+qi6gtqemk0aLdPfVbX0EiAami38H2GU4DgoKBM6 8oN2tKlt2Lf03MA40Hl2x3JunaNyLKAZoVdWWdvxfcJJ/K6kaGqxdDYAVJk98Iv/vu 9SapE3cxcF0bNbK360i8Oh4cti8ROM5m7k3p2PjE= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Trond Myklebust , Anna Schumaker Subject: [PATCH 5.15 404/511] NFS: Fix a potential data corruption Date: Sun, 17 Sep 2023 21:13:51 +0200 Message-ID: <20230917191123.545023246@linuxfoundation.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20230917191113.831992765@linuxfoundation.org> References: <20230917191113.831992765@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Trond Myklebust commit 88975a55969e11f26fe3846bf4fbf8e7dc8cbbd4 upstream. We must ensure that the subrequests are joined back into the head before we can retransmit a request. If the head was not on the commit lists, because the server wrote it synchronously, we still need to add it back to the retransmission list. Add a call that mirrors the effect of nfs_cancel_remove_inode() for O_DIRECT. Fixes: ed5d588fe47f ("NFS: Try to join page groups before an O_DIRECT retransmission") Cc: stable@vger.kernel.org Signed-off-by: Trond Myklebust Signed-off-by: Anna Schumaker Signed-off-by: Greg Kroah-Hartman --- fs/nfs/direct.c | 20 +++++++++++++++++++- 1 file changed, 19 insertions(+), 1 deletion(-) --- a/fs/nfs/direct.c +++ b/fs/nfs/direct.c @@ -509,13 +509,31 @@ out: return result; } +static void nfs_direct_add_page_head(struct list_head *list, + struct nfs_page *req) +{ + struct nfs_page *head = req->wb_head; + + if (!list_empty(&head->wb_list) || !nfs_lock_request(head)) + return; + if (!list_empty(&head->wb_list)) { + nfs_unlock_request(head); + return; + } + list_add(&head->wb_list, list); + kref_get(&head->wb_kref); + kref_get(&head->wb_kref); +} + static void nfs_direct_join_group(struct list_head *list, struct inode *inode) { struct nfs_page *req, *subreq; list_for_each_entry(req, list, wb_list) { - if (req->wb_head != req) + if (req->wb_head != req) { + nfs_direct_add_page_head(&req->wb_list, req); continue; + } subreq = req->wb_this_page; if (subreq == req) continue;