From nobody Sun Nov 24 13:31:25 2024 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.15]) (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 5C6A820E02C; Tue, 5 Nov 2024 19:35:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.15 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730835341; cv=none; b=dyk/VDn5s/fgQJBoc9AeAIb7bgbcodTmy91EZ2zBPJ19H5GtF1+PZBosV99DwyhcQwg0v3hIIhyIMHNREODuh5L3eIOv7S5V/K5TH2aPNVmvtE+V6UyNsIoezVjzeyPh0FyFN/IiAGwyF8FPL2txoIQNR5ZAOOZno5KfNmaua/8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730835341; c=relaxed/simple; bh=Nv/kEc4CVTqwYdLKuLpdo5expB9qETdFqCz08KbSXzQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=qXYWkMPqgtdzG+EuewCUGUtLuKwhwej65Szx2tneeHXEJfIkeJumSgld4OuNMNhYfzzz9s54P6BOkMH02fFKVMVFStUA1kf4R4AODoeSvL4IkuWvXIkCl2CsqoSiEmFXRNZzVRS1jjiHieBa/TxESo71nAXKnDgTUJC+cMSVEwQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=Z6JItqWB; arc=none smtp.client-ip=198.175.65.15 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="Z6JItqWB" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1730835340; x=1762371340; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=Nv/kEc4CVTqwYdLKuLpdo5expB9qETdFqCz08KbSXzQ=; b=Z6JItqWBnKGoraJz7TKkZugnOTQS4y0j4rv2ZcUCzNYBjwsgFiIJPt/5 RG8xLlHdLGY6RhepSYsibFgeSORNhA4YXHzTCuXiDGC9unfaB9TLyXeKZ 3FlEKy3gPK5wo/IEdufkGMGydjg2+vq0NVonVmgguTb4P2STLY/N1k8On 1a/l95/zPKn9mSEH5q5VBBLxf3xc9Daw1KVbY7a34LnxJiqBCYOxpjTtk OBELStMRs9SVBznexaV1QkhupUNFlesaJPEGMyZbntTie2aiM+Av/MLnx bcU8e60EkCPcGzgHM64OYtaOdKzwO2ZmN4ytkpC8QWtJlOsTgURa4yET7 g==; X-CSE-ConnectionGUID: MCEvghJzQvWWR+4Rj/wg6Q== X-CSE-MsgGUID: Y91/mFDvQxi8TojUnEq7xw== X-IronPort-AV: E=McAfee;i="6700,10204,11222"; a="34297819" X-IronPort-AV: E=Sophos;i="6.11,199,1725346800"; d="scan'208";a="34297819" Received: from fmviesa001.fm.intel.com ([10.60.135.141]) by orvoesa107.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 Nov 2024 11:35:36 -0800 X-CSE-ConnectionGUID: LfvPeTFeSlO6kKFIngGpXA== X-CSE-MsgGUID: BhsClcRnQY2kpNqQPs2AnA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.11,261,1725346800"; d="scan'208";a="114939399" Received: from ehanks-mobl1.amr.corp.intel.com (HELO vcostago-mobl3.intel.com) ([10.124.221.238]) by smtpauth.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 Nov 2024 11:35:35 -0800 From: Vinicius Costa Gomes To: brauner@kernel.org, amir73il@gmail.com, hu1.chen@intel.com Cc: miklos@szeredi.hu, malini.bhandaru@intel.com, tim.c.chen@intel.com, mikko.ylinen@intel.com, linux-unionfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, Vinicius Costa Gomes Subject: [PATCH overlayfs-next v3 2/4] fs/backing-file: Convert to revert/override_creds_light() Date: Tue, 5 Nov 2024 11:35:12 -0800 Message-ID: <20241105193514.828616-3-vinicius.gomes@intel.com> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20241105193514.828616-1-vinicius.gomes@intel.com> References: <20241105193514.828616-1-vinicius.gomes@intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" As the credentials used by backing-file are long lived in relation to the critical section (override_creds() -> revert_creds()) we can replace them by their lighter alternatives. Signed-off-by: Vinicius Costa Gomes --- fs/backing-file.c | 20 ++++++++++---------- 1 file changed, 10 insertions(+), 10 deletions(-) diff --git a/fs/backing-file.c b/fs/backing-file.c index a38737592ec7..526ddb4d6f76 100644 --- a/fs/backing-file.c +++ b/fs/backing-file.c @@ -176,7 +176,7 @@ ssize_t backing_file_read_iter(struct file *file, struc= t iov_iter *iter, !(file->f_mode & FMODE_CAN_ODIRECT)) return -EINVAL; =20 - old_cred =3D override_creds(ctx->cred); + old_cred =3D override_creds_light(ctx->cred); if (is_sync_kiocb(iocb)) { rwf_t rwf =3D iocb_to_rw_flags(flags); =20 @@ -197,7 +197,7 @@ ssize_t backing_file_read_iter(struct file *file, struc= t iov_iter *iter, backing_aio_cleanup(aio, ret); } out: - revert_creds(old_cred); + revert_creds_light(old_cred); =20 if (ctx->accessed) ctx->accessed(iocb->ki_filp); @@ -233,7 +233,7 @@ ssize_t backing_file_write_iter(struct file *file, stru= ct iov_iter *iter, */ flags &=3D ~IOCB_DIO_CALLER_COMP; =20 - old_cred =3D override_creds(ctx->cred); + old_cred =3D override_creds_light(ctx->cred); if (is_sync_kiocb(iocb)) { rwf_t rwf =3D iocb_to_rw_flags(flags); =20 @@ -264,7 +264,7 @@ ssize_t backing_file_write_iter(struct file *file, stru= ct iov_iter *iter, backing_aio_cleanup(aio, ret); } out: - revert_creds(old_cred); + revert_creds_light(old_cred); =20 return ret; } @@ -281,9 +281,9 @@ ssize_t backing_file_splice_read(struct file *in, struc= t kiocb *iocb, if (WARN_ON_ONCE(!(in->f_mode & FMODE_BACKING))) return -EIO; =20 - old_cred =3D override_creds(ctx->cred); + old_cred =3D override_creds_light(ctx->cred); ret =3D vfs_splice_read(in, &iocb->ki_pos, pipe, len, flags); - revert_creds(old_cred); + revert_creds_light(old_cred); =20 if (ctx->accessed) ctx->accessed(iocb->ki_filp); @@ -310,11 +310,11 @@ ssize_t backing_file_splice_write(struct pipe_inode_i= nfo *pipe, if (ret) return ret; =20 - old_cred =3D override_creds(ctx->cred); + old_cred =3D override_creds_light(ctx->cred); file_start_write(out); ret =3D out->f_op->splice_write(pipe, out, &iocb->ki_pos, len, flags); file_end_write(out); - revert_creds(old_cred); + revert_creds_light(old_cred); =20 if (ctx->end_write) ctx->end_write(iocb, ret); @@ -337,9 +337,9 @@ int backing_file_mmap(struct file *file, struct vm_area= _struct *vma, =20 vma_set_file(vma, file); =20 - old_cred =3D override_creds(ctx->cred); + old_cred =3D override_creds_light(ctx->cred); ret =3D call_mmap(vma->vm_file, vma); - revert_creds(old_cred); + revert_creds_light(old_cred); =20 if (ctx->accessed) ctx->accessed(vma->vm_file); --=20 2.47.0