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=-13.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 145E7C433E0 for ; Tue, 26 Jan 2021 04:39:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CB5FF224D1 for ; Tue, 26 Jan 2021 04:38:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726714AbhAZEiy (ORCPT ); Mon, 25 Jan 2021 23:38:54 -0500 Received: from wforward4-smtp.messagingengine.com ([64.147.123.34]:55255 "EHLO wforward4-smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729258AbhAYORd (ORCPT ); Mon, 25 Jan 2021 09:17:33 -0500 Received: from compute2.internal (compute2.nyi.internal [10.202.2.42]) by mailforward.west.internal (Postfix) with ESMTP id 3A5EF533; Mon, 25 Jan 2021 09:15:59 -0500 (EST) Received: from mailfrontend2 ([10.202.2.163]) by compute2.internal (MEProxy); Mon, 25 Jan 2021 09:15:59 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:content-transfer-encoding:content-type :date:from:message-id:mime-version:subject:to:x-me-proxy :x-me-proxy:x-me-sender:x-me-sender:x-sasl-enc; s=fm1; bh=ojXrkm ZlL3hzN8Brh52OahB9NkRoYmh9mpCxKQilaxI=; b=Xw6/65DjoIZ/kVugo9H42T IbaZyqx3MjmREJszxakasMshGRcHjvGm1/ku9QBOOpP+OvEnga40ql94G79dlqd0 xUQxbprhXOTajLpFRKp1DCM92/8Sjdpl8JKWP4OaiHTO/XMG4Dk43ir03nTHZcVi YE9qdflNnBmTi04Eru8HTJpZDrgEWlLISJzDP86Rs68XyXgXpxhZlowXuxm46bKz 4OrNUH9VjWWv1t0sVI3XMEeG1f1g79njD0O9D1H5xpECJa5Zm2Drxl3y5h3ZesT4 kw81/tlqfj1OGp7BQyuR8lwkcBho3vsd1+0jqiS6EaayPBH0H9UL5R74A49b7a2g == X-ME-Sender: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgeduledrvdefgdeitdcutefuodetggdotefrodftvf curfhrohhfihhlvgemucfhrghsthforghilhdpqfgfvfdpuffrtefokffrpgfnqfghnecu uegrihhlohhuthemuceftddtnecunecujfgurhepuffvhfffkfggtgfgsehtkeertddttd flnecuhfhrohhmpeeoghhrvghgkhhhsehlihhnuhigfhhouhhnuggrthhiohhnrdhorhhg qeenucggtffrrghtthgvrhhnpeeiteevheeuvdfhtdfgvdeiieehheefleevveehjedute evueevledujeejgfetheenucfkphepkeefrdekiedrjeegrdeigeenucevlhhushhtvghr ufhiiigvpedtnecurfgrrhgrmhepmhgrihhlfhhrohhmpehgrhgvgheskhhrohgrhhdrtg homh X-ME-Proxy: Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) by mail.messagingengine.com (Postfix) with ESMTPA id 1CEB5108005F; Mon, 25 Jan 2021 09:15:57 -0500 (EST) Subject: FAILED: patch "[PATCH] io_uring: account io_uring internal files as REQ_F_INFLIGHT" failed to apply to 5.10-stable tree To: axboe@kernel.dk Cc: From: Date: Mon, 25 Jan 2021 15:15:55 +0100 Message-ID: <161158415525311@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org The patch below does not apply to the 5.10-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 02a13674fa0e8dd326de8b9f4514b41b03d99003 Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Sat, 23 Jan 2021 15:49:31 -0700 Subject: [PATCH] io_uring: account io_uring internal files as REQ_F_INFLIGHT We need to actively cancel anything that introduces a potential circular loop, where io_uring holds a reference to itself. If the file in question is an io_uring file, then add the request to the inflight list. Cc: stable@vger.kernel.org # 5.9+ Signed-off-by: Jens Axboe diff --git a/fs/io_uring.c b/fs/io_uring.c index 8a98afed50cd..c07913ec0cca 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -1075,8 +1075,11 @@ static bool io_match_task(struct io_kiocb *head, return true; io_for_each_link(req, head) { - if ((req->flags & REQ_F_WORK_INITIALIZED) && - (req->work.flags & IO_WQ_WORK_FILES) && + if (!(req->flags & REQ_F_WORK_INITIALIZED)) + continue; + if (req->file && req->file->f_op == &io_uring_fops) + return true; + if ((req->work.flags & IO_WQ_WORK_FILES) && req->work.identity->files == files) return true; } @@ -1505,11 +1508,14 @@ static bool io_grab_identity(struct io_kiocb *req) return false; atomic_inc(&id->files->count); get_nsproxy(id->nsproxy); - req->flags |= REQ_F_INFLIGHT; - spin_lock_irq(&ctx->inflight_lock); - list_add(&req->inflight_entry, &ctx->inflight_list); - spin_unlock_irq(&ctx->inflight_lock); + if (!(req->flags & REQ_F_INFLIGHT)) { + req->flags |= REQ_F_INFLIGHT; + + spin_lock_irq(&ctx->inflight_lock); + list_add(&req->inflight_entry, &ctx->inflight_list); + spin_unlock_irq(&ctx->inflight_lock); + } req->work.flags |= IO_WQ_WORK_FILES; } if (!(req->work.flags & IO_WQ_WORK_MM) && @@ -6164,8 +6170,10 @@ static void io_req_drop_files(struct io_kiocb *req) struct io_uring_task *tctx = req->task->io_uring; unsigned long flags; - put_files_struct(req->work.identity->files); - put_nsproxy(req->work.identity->nsproxy); + if (req->work.flags & IO_WQ_WORK_FILES) { + put_files_struct(req->work.identity->files); + put_nsproxy(req->work.identity->nsproxy); + } spin_lock_irqsave(&ctx->inflight_lock, flags); list_del(&req->inflight_entry); spin_unlock_irqrestore(&ctx->inflight_lock, flags); @@ -6450,6 +6458,15 @@ static struct file *io_file_get(struct io_submit_state *state, file = __io_file_get(state, fd); } + if (file && file->f_op == &io_uring_fops) { + io_req_init_async(req); + req->flags |= REQ_F_INFLIGHT; + + spin_lock_irq(&ctx->inflight_lock); + list_add(&req->inflight_entry, &ctx->inflight_list); + spin_unlock_irq(&ctx->inflight_lock); + } + return file; } @@ -8860,8 +8877,7 @@ static void io_uring_cancel_files(struct io_ring_ctx *ctx, spin_lock_irq(&ctx->inflight_lock); list_for_each_entry(req, &ctx->inflight_list, inflight_entry) { - if (req->task != task || - req->work.identity->files != files) + if (!io_match_task(req, task, files)) continue; found = true; break;