From patchwork Mon Feb 11 19:00:46 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jens Axboe X-Patchwork-Id: 10806691 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 635D76C2 for ; Mon, 11 Feb 2019 19:01:28 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 560112AE23 for ; Mon, 11 Feb 2019 19:01:28 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 49EBE2B243; Mon, 11 Feb 2019 19:01:28 +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=-7.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,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 E9A232AE23 for ; Mon, 11 Feb 2019 19:01:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387473AbfBKTB0 (ORCPT ); Mon, 11 Feb 2019 14:01:26 -0500 Received: from mail-it1-f196.google.com ([209.85.166.196]:53414 "EHLO mail-it1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1733289AbfBKTB0 (ORCPT ); Mon, 11 Feb 2019 14:01:26 -0500 Received: by mail-it1-f196.google.com with SMTP id g85so883278ita.3 for ; Mon, 11 Feb 2019 11:01:25 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel-dk.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=Q8VhM/to/dzC4LkTSiVPV4UGBDV+ReSxEMSKO3PuRJ8=; b=C84gSm0rqjMc4waInNUluvmDHqiqqP+cjSKkajFJGoKTGmqN2WqDX/sX/48lbOmwni DUC07OBg60eowKk7WXG2AjK7fMaJvDOeiiigGfr68PzkKClGCEFFMZBndnKgHMbttPmn sss8k7/01EQBAOHMzvCJ/QwMnuBUv+Erfb/CdPRqah5WhbHENKHMsxWheQz2BWSeZMZA 18KKlTXk0Nxv/UMJkM9SXYp+nHQAY5YRF2yNNDak7u2SWNbScyApB1f+H6A7JDmoTFq6 K6jKlcKsDLYDgAWCBSf3m4LjCl1ewFylHxKw9wDajk4prmsYEYNthauDTbzsY2KUZ9Z/ I87A== 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; bh=Q8VhM/to/dzC4LkTSiVPV4UGBDV+ReSxEMSKO3PuRJ8=; b=Mwu16wvj9y8d/ApIHKHD34rEUpWOeX/IzFxPYjeWRR9J65CMhL5paZ/wdtPNyNp/Ox qqtLaBPEwR9/GN+VqYNuI/vtxXUgnychkk9Ugp6YPvjOIMYMclTMusn0cG0ENT5RoL6w wJaancFIPww4uTBhDPyNFCcEpKF5rtZO5Q1gdkOq8VG0V2qMkFPcPeb5397AubH5TkHd U+C9yvwL7ZA1CE9alUp3NjCgv8FAUs9JyK8NIXgR/WxNlWbRThEO7zIcxTLgQhDZhum/ u0ktJsBd5yJtm4xBBdnNWJu8OCUmHgJEgxbQk8jbDv2RnT2m4PI4rrAK60yMBOIBt/7M GlhA== X-Gm-Message-State: AHQUAuasENCXgPEKHphoLg7KrNHi+BHqQ8EYpq0P15ubmHK4i2+zUvfo s2UK6/b/tXOtRG7K32b5jI3YrQ== X-Google-Smtp-Source: AHgI3IY4E4w3zs5oLhDi547VPCXja2o/P81PRWJwIsJRv9MT4oFuik3Slo+zTKsRIfHIvswvZtJIKA== X-Received: by 2002:a24:7c58:: with SMTP id a85mr611580itd.9.1549911685165; Mon, 11 Feb 2019 11:01:25 -0800 (PST) Received: from x1.localdomain ([216.160.245.98]) by smtp.gmail.com with ESMTPSA id h184sm62446ith.41.2019.02.11.11.01.23 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 11 Feb 2019 11:01:24 -0800 (PST) From: Jens Axboe To: linux-aio@kvack.org, linux-block@vger.kernel.org, linux-api@vger.kernel.org Cc: hch@lst.de, jmoyer@redhat.com, avi@scylladb.com, jannh@google.com, viro@ZenIV.linux.org.uk, Jens Axboe Subject: [PATCH 16/19] io_uring: add io_kiocb ref count Date: Mon, 11 Feb 2019 12:00:46 -0700 Message-Id: <20190211190049.7888-18-axboe@kernel.dk> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190211190049.7888-1-axboe@kernel.dk> References: <20190211190049.7888-1-axboe@kernel.dk> Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP We'll use this for the POLL implementation. Regular requests will NOT be using references, so initialize it to 0. Any real use of the io_kiocb ref will initialize it to at least 2. Reviewed-by: Hannes Reinecke Reviewed-by: Christoph Hellwig Signed-off-by: Jens Axboe --- fs/io_uring.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/fs/io_uring.c b/fs/io_uring.c index 24c280076e81..33b6c6167595 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -184,6 +184,7 @@ struct io_kiocb { struct io_ring_ctx *ctx; struct list_head list; unsigned int flags; + refcount_t refs; #define REQ_F_FORCE_NONBLOCK 1 /* inline submission attempt */ #define REQ_F_IOPOLL_COMPLETED 2 /* polled IO has completed */ #define REQ_F_FIXED_FILE 4 /* ctx owns file */ @@ -377,6 +378,7 @@ static struct io_kiocb *io_get_req(struct io_ring_ctx *ctx, req->ctx = ctx; req->flags = 0; + refcount_set(&req->refs, 0); return req; out: io_ring_drop_ctx_refs(ctx, 1); @@ -394,8 +396,10 @@ static void io_free_req_many(struct io_ring_ctx *ctx, void **reqs, int *nr) static void io_free_req(struct io_kiocb *req) { - io_ring_drop_ctx_refs(req->ctx, 1); - kmem_cache_free(req_cachep, req); + if (!refcount_read(&req->refs) || refcount_dec_and_test(&req->refs)) { + io_ring_drop_ctx_refs(req->ctx, 1); + kmem_cache_free(req_cachep, req); + } } /*