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=-9.0 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,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 D8047C282C4 for ; Sat, 9 Feb 2019 21:14:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A780D21934 for ; Sat, 9 Feb 2019 21:14:25 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=kernel-dk.20150623.gappssmtp.com header.i=@kernel-dk.20150623.gappssmtp.com header.b="xejsy1hG" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727132AbfBIVOZ (ORCPT ); Sat, 9 Feb 2019 16:14:25 -0500 Received: from mail-pf1-f196.google.com ([209.85.210.196]:40428 "EHLO mail-pf1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727123AbfBIVOY (ORCPT ); Sat, 9 Feb 2019 16:14:24 -0500 Received: by mail-pf1-f196.google.com with SMTP id h1so515645pfo.7 for ; Sat, 09 Feb 2019 13:14:24 -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=QI6By8wA+81DOgTbJ9bfEfiV+Q9Uf/NGeZ9aKzg06YA=; b=xejsy1hGYNR8/13wrAnMzrxXx8kbXRHDOBBd5cxKmja4kojInxGyM1p6pBYHaGdCyP fp+jniWUYiNvbgUhKYwDkOJ6ei57m5TE49okR5YV7mErg8RlbZiQBBkrQgImq8vTfFuO ubV5tvghsxctC3zPlAAs+LxCVQmBnDBiGhfNxvshZ0iR2teq0DCAH9XKOFErKT9VL8SS RgXsQ9xfOEVrfCmpZfT6Bo2DomQ4uL0PRox2Tu8sk4g6t4Vd4C9jAL133RkbQDB3k6eH ISRhJYRuY5ekHQjOTh04CZ0g4Hi0e64HsymDwGl0KFbVKlr4YS4bL0qjasCBvNeJ1PLq MMlg== 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=QI6By8wA+81DOgTbJ9bfEfiV+Q9Uf/NGeZ9aKzg06YA=; b=iKOA4TQiL099Uo7tbO9+SW88xbBWBgQZuPUlWulokh8MJG7eeqwnNCrmskYFM++ahJ O8XB0Nzos0KGt/4uuwQ9/F5AffQmo8EvAyFbTMfO6xxG22dD5mmEmOez8e+jYoik6hWh EuzAkPBq2aUYzG34l/unlkR31SCqC75EVswkyNgzDA1GXmgNCD7qdzCzEKvhC27z9vqT nYvgxmmfvSeMwzxXpSr5CGjhZ5wuLp6q31Bux5HgvPM5C4esQr34wpkFjcxMHi7RObax qylRKoolPSHgHBsxd9N7c975yS/te0vQL/OJ+3aHg5muLfB2o/JCRR1J7NyL9Ro2lpto hNcA== X-Gm-Message-State: AHQUAua1zXqxGsn4yvtlb4OjwScWNeBgdwPAX9LJWJLg4GVnyrhAn+7g i++iV0wjNEtPw2f/lc58THJICw== X-Google-Smtp-Source: AHgI3IbnEok1tUpbo8JF4Mj4Jjwoe0ylJIg4IbvIFSin6IO6yxvP2101MUrhQIDSGQuveEy1yexI+Q== X-Received: by 2002:a63:65c7:: with SMTP id z190mr22251181pgb.249.1549746863829; Sat, 09 Feb 2019 13:14:23 -0800 (PST) Received: from x1.localdomain (66.29.188.166.static.utbb.net. [66.29.188.166]) by smtp.gmail.com with ESMTPSA id a17sm7004942pgm.26.2019.02.09.13.14.22 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sat, 09 Feb 2019 13:14:22 -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: Sat, 9 Feb 2019 14:13:43 -0700 Message-Id: <20190209211346.26060-17-axboe@kernel.dk> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190209211346.26060-1-axboe@kernel.dk> References: <20190209211346.26060-1-axboe@kernel.dk> Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org 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: 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 cd7ff2643292..dc5667c53c55 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -164,6 +164,7 @@ 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 */ @@ -353,6 +354,7 @@ 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); @@ -370,8 +372,10 @@ 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); + } } /* -- 2.17.1