From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794555081; b=NxDYhKoidDcMWjePcrQAFF6MTjehtOLiZ+inh0emt9fMotW4CfvcsTjbU76DHLtFhUcH ildl9m3Kq6NCHyEBFBtftlZRgJjht0FLuMUseFlkR/LJTG8UNpWyNowG4J3+cNkdovKw2 cmE3F4TcXhYfP4uEB3yo+PbchEKnn3Edgscvm1seW7psn9fVdbrbEogMMJGDpjrrO6Hbo I02Zfmp2yR68dMyRrIEHGaBQrV6jpBX9RLvrf5c1apAzNs4r7sBCfDFwTH5X9tIgqbo+T Dkws1GONupDm+dQbR5HCZ+9psQRyO1+60q3FBRXEmYTCR1IdarkVC12u138t3ARVN7Q== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794555081; h=Received:DKIM-Signature:Message-ID:From:Subject:Reply-To:To:Cc: In-Reply-To:References:Content-Type:Content-Transfer-Encoding:Date; bh=nDa9VAjgxa+4n9LCqghzIHGgKUlaBKciWRqhOdkC+3Q=; b=v4FFXomzP9ldO+gEq5GICGWYTUAqar49NX0iLcE77y1q6LmSvLmMqZWRxUjdr3CiqQf0 ZoqMWX4DJ/1NJd2A1ielxbtyxmcBl/Njg/toPy04zqheXLGBDxZFPl9ggbCO06jZxCS8S Y9JfaFSe01b1oyKJhI38FhAsklFukJcqo+xm9ACoTWnMcdh3qFagR1qvp5wtBRTlTTI+C jc6V8FCE+deGSCUlQjE8si/9b8fIH6Q0vh0Dkqc1Dzn7J//Dbfp6L0yeIj+hA8X70DX/j 7uNjGJalAotARCgGSnx+9luN3m1mHDVBwSujDrnWw8ZvqIOgShdlE9KLuvhCRBMRwYw== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=BQpY08Z5; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C0E3B606A31C for ; Fri, 13 Nov 2026 07:31:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=BQpY08Z5 Received: by smtp.kernel.org (Postfix) with ESMTPSA id 219AD1F000C4; Fri, 13 Nov 2026 07:31:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1794555081; bh=nDa9VAjgxa+4n9LCqghzIHGgKUlaBKciWRqhOdkC+3Q=; h=From:Subject:Reply-To:To:Cc:In-Reply-To:References:Date; b=BQpY08Z50UPXdCv8PkcZtUlkQUqUePfxza7Fxu6D8VbyLL5LgSVLu2CeVxtyUM1GS PECmnz1cuxtxB5uXSezZiti0K6n0uMrwaqaRR4IMOXz3g3n8rD4T7BhufPs4K7PgYg 51Si4VVbbw5sD1SEU9PRUtMEQRjxJBtTYtcYOzkizWKOeqBYkSDHzT3N5CYgSceof7 usgUVUjNnF8w2vOLzYnUAKErlEPf0xv90vfQUEvcDLnR2RXRRqwj42LEGL5DEoqLNm W8FZPbWD5tOAN0BjTlQCsidtaUWnfTt+zaIZC5PIlDpcLSRqgTPZsKXE0YkElRLsLg KxTZpNyFQSPAA== Message-ID: From: sashiko-bot@kernel.org Subject: Re: [RFC PATCH v2 2/8] iomap: add dma-buf direct I/O guards Reply-To: sashiko-reviews@lists.linux.dev To: "Mengmeng Zhao" Cc: linux-ext4@vger.kernel.org, tytso@mit.edu In-Reply-To: <20261113070621.273953-3-mengmeng.zhao@linux.dev> References: <20261113070621.273953-1-mengmeng.zhao@linux.dev> <20261113070621.273953-3-mengmeng.zhao@linux.dev> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Date: Fri, 13 Nov 2026 07:31:20 +0000 X-Mailing-List: linux-ext4@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list > From: Nitesh Shetty >=20 > Direct I/O copies data from the CPU in four places, zero-filling > holes, inline data, bounce pages and integrity metadata. A dma-buf > iterator has no pages behind it, so refuse it there. >=20 > Reads that encounter a hole or unwritten extent therefore return > -EOPNOTSUPP for the entire operation, even if I/O for an earlier > mapped extent was already submitted. >=20 > Signed-off-by: Nitesh Shetty > Signed-off-by: Anuj Gupta > Signed-off-by: Mengmeng Zhao > Signed-off-by: Li Wang Sashiko has reviewed this patch and found no issues. --=20 Sashiko AI review =C2=B7 https://sashiko.dev/#/patchset/20261113070621.2739= 53-1-mengmeng.zhao@linux.dev?part=3D2