From patchwork Sun Nov 24 13:44:08 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christian Brauner X-Patchwork-Id: 13884108 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 27CC520DD5B; Sun, 24 Nov 2024 13:45:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732455902; cv=none; b=Tg4HmqaPF/BNURHSz9opeZPbFR30SJg7dvFsN0Ic93ihn3f+R6sO9y3peOUpuZ+BhElsAbyhPZdpfIZfPw1xRHNAD8SWlXj0wlnA0RSz3RGGxPNgV2ZwpALjEEI9TjTJA/3UIwqSJslYabNItKjK9vBcD4f/DfHcMj971hFAd3U= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732455902; c=relaxed/simple; bh=zrNjxsAjCHPuNaCLSpJvKnvN3m8hTYHZar8IMmrrZ2o=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=GyriOHyR5frz6PUvfAGB0r0XEeKGevVl47K8kLAzXB6WJMMOELlZZjnIxi0A0kRuH33TCWPbovU4QmnWm9uA3WH6aEhYVDryM2fTVdxbML3bXi0FiR+siS2sO1YWIYl92qG1pOPXIT3YfZ5uFv7Z3NxzSIWE0G7ubXu5jtMy20o= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=fS2JeZSH; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="fS2JeZSH" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 26EA7C4CED1; Sun, 24 Nov 2024 13:44:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1732455901; bh=zrNjxsAjCHPuNaCLSpJvKnvN3m8hTYHZar8IMmrrZ2o=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fS2JeZSHY1mgMlhvxOAZvcwdSZlhVxyVXXQBH48ROlGFbdKVTKnER3kTqjuIoQwMp yCyVt9JCKUFoQcOVAsIlM9gkvGZ14bBerCjWH1Iwswu5WluB5aw3dE+cMdxoJnprTI c8R9M9CT5QPAW3Gm0qfmth18wcrbC93bve4wo6r6Z/spG6xlNB9K4tr179wdRhwIB/ e0RyQj5cX2xc8rYyrrfMZ+RaWtsBgGmiU5yropv4+2+v8VSkxneKp++dkKc55Qi6aM Z8dlalq83fDsQNoc3lRfJSF4VzCSZYRZWcgTAeGkdEnNmeLhISz4ZQ3dMK2JRA+QVT VAdoxtZ5Ly6gA== From: Christian Brauner To: Linus Torvalds Cc: Christian Brauner , Amir Goldstein , Miklos Szeredi , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: [PATCH 22/26] io_uring: avoid pointless cred reference count bump Date: Sun, 24 Nov 2024 14:44:08 +0100 Message-ID: <20241124-work-cred-v1-22-f352241c3970@kernel.org> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20241124-work-cred-v1-0-f352241c3970@kernel.org> References: <20241124-work-cred-v1-0-f352241c3970@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Mailer: b4 0.15-dev-355e8 X-Developer-Signature: v=1; a=openpgp-sha256; l=1908; i=brauner@kernel.org; h=from:subject:message-id; bh=zrNjxsAjCHPuNaCLSpJvKnvN3m8hTYHZar8IMmrrZ2o=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMaQ76y5cJX/+QvW8vq7f3e8T1L787PCUtTpjevvw69mRK XILG9/d6yhlYRDjYpAVU2RxaDcJl1vOU7HZKFMDZg4rE8gQBi5OAZhITRgjw2Wzm9OZrFK737K3 2TlOiArnPnm06foRXpu/8hsOeoYrfmH4p8q1bk83i8SBBa9WXr374PNGUdYkz0dP2J10DatX/+X rZwIA X-Developer-Key: i=brauner@kernel.org; a=openpgp; fpr=4880B8C9BD0E5106FC070F4F7B3C391EFEA93624 No need for the extra reference count bump. Signed-off-by: Christian Brauner --- io_uring/io_uring.c | 4 ++-- io_uring/sqpoll.c | 4 ++-- 2 files changed, 4 insertions(+), 4 deletions(-) diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c index ad4d8e94a8665cf5f3e9ea0fd9bc6c03a03cc48f..8012933998837ddcef45c14f1dfe543947a9eaec 100644 --- a/io_uring/io_uring.c +++ b/io_uring/io_uring.c @@ -1704,7 +1704,7 @@ static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags) return -EBADF; if (unlikely((req->flags & REQ_F_CREDS) && req->creds != current_cred())) - creds = override_creds(get_new_cred(req->creds)); + creds = override_creds(req->creds); if (!def->audit_skip) audit_uring_entry(req->opcode); @@ -1715,7 +1715,7 @@ static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags) audit_uring_exit(!ret, ret); if (creds) - put_cred(revert_creds(creds)); + revert_creds(creds); if (ret == IOU_OK) { if (issue_flags & IO_URING_F_COMPLETE_DEFER) diff --git a/io_uring/sqpoll.c b/io_uring/sqpoll.c index 1ca96347433695de1eb0e3bec7c6da4299e9ceb0..6df5e649c413e39e36db6cde2a8c6745e533bea9 100644 --- a/io_uring/sqpoll.c +++ b/io_uring/sqpoll.c @@ -174,7 +174,7 @@ static int __io_sq_thread(struct io_ring_ctx *ctx, bool cap_entries) const struct cred *creds = NULL; if (ctx->sq_creds != current_cred()) - creds = override_creds(get_new_cred(ctx->sq_creds)); + creds = override_creds(ctx->sq_creds); mutex_lock(&ctx->uring_lock); if (!wq_list_empty(&ctx->iopoll_list)) @@ -192,7 +192,7 @@ static int __io_sq_thread(struct io_ring_ctx *ctx, bool cap_entries) if (to_submit && wq_has_sleeper(&ctx->sqo_sq_wait)) wake_up(&ctx->sqo_sq_wait); if (creds) - put_cred(revert_creds(creds)); + revert_creds(creds); } return ret;