From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 B9B61497387; Thu, 17 Sep 2026 15:29:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789659002; cv=none; b=R955RNusrEaM9aAhgjCwECA/hhmBlVAqLu2mcBIyZSBW0xZ9OMAlOs0w/O34PcyGyMduZO5P4RgPjQMIZ1VJoPCvSJ7qY8g9lNFCqbme/IRP/BSljyc2SgK7yplyrhDUQ8QPzyPniVFcwusrTpZpG7/F0eC0fhrJ1/Rn5+EZzgY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789659002; c=relaxed/simple; bh=4arC5SGsf7kOgfkrSSIxlC6e/6olbs3swRkos3LE/k0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=YJx4avcBoQsNqzmP3wYANi767QHWWEuabEZ9ZPjHbxX3nmKjjM04AgucfFOrazY7AZoVz1EyOPlZphpyutiFzpU3pvt7IRU40XtUDVY0AalfO7gA+TYOqBIDbTujjaZ0NJcPGaoTV+T93eXiArxrEnaqcnUIBZV9ZEeEX+kAH2M= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=JnukVTPJ; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="JnukVTPJ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1E1551F0089B; Thu, 17 Sep 2026 15:29:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789658992; bh=UlpEjdtyIdX24bIsR/7tQJWsWG32pc3//uWH2/hjp2s=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=JnukVTPJ9W7D7OKB/jj3NOgWg9jEk6HnHpLk5ZyActp7Izz0Syvi0TwtLzs3WsC// MhRecqWwfzIFRY1jmKQifnFugX+WNpgXL1DTPO185ERyOubpEydENirNKiKKeTTfhY Ws668pCH3IFfWobaoE7fHe5QJkTtum1uDYZeZudc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, David Howells , Paulo Alcantara , netfs@lists.linux.dev, linux-fsdevel@vger.kernel.org, "Christian Brauner (Amutable)" , Sasha Levin Subject: [PATCH 7.2 080/733] netfs: Fix unbuffered/DIO write partial transfer error return Date: Thu, 17 Sep 2026 16:06:28 +0100 Message-ID: <20260917151352.889338385@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260917151350.597953846@linuxfoundation.org> References: <20260917151350.597953846@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 7.2-stable review patch. If anyone has any objections, please let me know. ------------------ From: David Howells [ Upstream commit c753a33664e4e86246f7491a93d9a77c1a673b5d ] Fix unbuffered/DIO write to return the amount of data transferred in preference to an error if a partial transfer has been achieved, and to prefer an error stashed in the request over the one returned by netfs_unbuffered_write() (likely -EINTR or -ERESTARTSYS). Fixes: a0b4c7a49137e ("netfs: Fix unbuffered/DIO writes to dispatch subrequests in strict sequence") Link: https://sashiko.dev/#/patchset/20260824120224.504575-1-dhowells%40redhat.com Signed-off-by: David Howells Link: https://patch.msgid.link/20260827134304.2075713-3-dhowells@redhat.com Acked-by: Paulo Alcantara cc: Paulo Alcantara cc: netfs@lists.linux.dev cc: linux-fsdevel@vger.kernel.org Signed-off-by: Christian Brauner (Amutable) Signed-off-by: Sasha Levin --- fs/netfs/direct_write.c | 12 +++++------- 1 file changed, 5 insertions(+), 7 deletions(-) diff --git a/fs/netfs/direct_write.c b/fs/netfs/direct_write.c index c16fbad286a17..d53b42ceadd23 100644 --- a/fs/netfs/direct_write.c +++ b/fs/netfs/direct_write.c @@ -139,13 +139,11 @@ static int netfs_unbuffered_write(struct netfs_io_request *wreq) if (test_bit(NETFS_SREQ_NEED_RETRY, &subreq->flags)) { retry = true; } else if (test_bit(NETFS_SREQ_FAILED, &subreq->flags)) { - ret = subreq->error; - wreq->error = ret; + wreq->error = subreq->error; netfs_see_subrequest(subreq, netfs_sreq_trace_see_failed); subreq = NULL; break; } - ret = 0; if (!retry) { netfs_unbuffered_write_collect(wreq, stream, subreq); @@ -288,11 +286,11 @@ ssize_t netfs_unbuffered_write_iter_locked(struct kiocb *iocb, struct iov_iter * ret = -EIOCBQUEUED; } else { ret = netfs_unbuffered_write(wreq); - if (ret < 0) { - _debug("begin = %zd", ret); - } else { + if (wreq->transferred) { iocb->ki_pos += wreq->transferred; - ret = wreq->transferred ?: wreq->error; + ret = wreq->transferred; + } else if (wreq->error) { + ret = wreq->error; } netfs_put_request(wreq, netfs_rreq_trace_put_complete); -- 2.53.0