From patchwork Tue Mar 19 00:29:24 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Xiubo Li X-Patchwork-Id: 781148 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (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 CDFDCA34 for ; Tue, 19 Mar 2024 00:32:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710808345; cv=none; b=EuuN4oe4CoRl+b/bTZtgvDY64XGAagsNrvGWyov1vwI1r2MtR/T2H5QdRzIfAQQ6v7diKr4Y12XbBfd9H215RwJgaMf55zuSngtKPZkFLre84/QwSkbuy7QJLvGYq9Kv3C2cSl0so3ehpeasHmukMmUqj0UPoN3uK63sCKXaqS4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710808345; c=relaxed/simple; bh=eixFatOG9hxxMNaiiRSJ4UmHxbb0d09Km4z10CzPjgc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=h9TypRczMy5Fq5K3vhdNWtqGCwKy3aPYKxEHtt/5ldlS6bQ2WTZn+zce4OgPYU6URfQ05LZcySTVPIISCJJiHc5bdNPaRHQeBjIZW7tom4ciJyBFfRKDoASG1nHKktKR60DziHgHqV6fHaemQ5M269lTJ1aFCkH89HBMHpeaIvc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=PFZrJ5lT; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="PFZrJ5lT" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1710808342; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=MGFk2DXdMbeQg3XMZJB7jsv8X67Bj6zraEBOuK6oql8=; b=PFZrJ5lT/w0z9CCJkhZlUYADhcdLjL5L5Ee9HjL47k3rxciILNKIMau2QS2qqa1PndUHKQ jgBmLb5HLDfi/bluLv0q+kuF1h3fUlCjf2+ixPaWo/04yrGyzD/Edyq57Ec1VlRBJ3rjcx tKFFCH+W1Kbx1/5AfdLlLvbKMbWCMDk= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-144-zZummcDsN_CxDrVR0J7Iwg-1; Mon, 18 Mar 2024 20:32:19 -0400 X-MC-Unique: zZummcDsN_CxDrVR0J7Iwg-1 Received: from smtp.corp.redhat.com (int-mx09.intmail.prod.int.rdu2.redhat.com [10.11.54.9]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 08F37185A789; Tue, 19 Mar 2024 00:32:19 +0000 (UTC) Received: from li-a71a4dcc-35d1-11b2-a85c-951838863c8d.ibm.com.com (unknown [10.72.112.45]) by smtp.corp.redhat.com (Postfix) with ESMTP id 7AA5D492BC8; Tue, 19 Mar 2024 00:32:15 +0000 (UTC) From: xiubli@redhat.com To: ceph-devel@vger.kernel.org Cc: idryomov@gmail.com, jlayton@kernel.org, vshankar@redhat.com, mchangir@redhat.com, frankhsiao@qnap.com, Xiubo Li Subject: [PATCH v3 1/2] ceph: skip copying the data extends the file EOF Date: Tue, 19 Mar 2024 08:29:24 +0800 Message-ID: <20240319002925.1228063-2-xiubli@redhat.com> In-Reply-To: <20240319002925.1228063-1-xiubli@redhat.com> References: <20240319002925.1228063-1-xiubli@redhat.com> Precedence: bulk X-Mailing-List: ceph-devel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.9 From: Xiubo Li If hits the EOF it will revise the return value to the i_size instead of the real length read, but it will advance the offset of iovc, then for the next try it may be incorrectly skipped. This will just skip advancing the iovc's offset more than i_size. URL: https://patchwork.kernel.org/project/ceph-devel/list/?series=819323 Reported-by: Frank Hsiao 蕭法宣 Signed-off-by: Xiubo Li Tested-by: Frank Hsiao 蕭法宣 --- fs/ceph/file.c | 23 +++++++++++++---------- 1 file changed, 13 insertions(+), 10 deletions(-) diff --git a/fs/ceph/file.c b/fs/ceph/file.c index 24a003eaa5e0..c35878427985 100644 --- a/fs/ceph/file.c +++ b/fs/ceph/file.c @@ -1200,7 +1200,12 @@ ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos, } idx = 0; - left = ret > 0 ? ret : 0; + if (ret <= 0) + left = 0; + else if (off + ret > i_size) + left = i_size - off; + else + left = ret; while (left > 0) { size_t plen, copied; @@ -1229,15 +1234,13 @@ ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos, } if (ret > 0) { - if (off > *ki_pos) { - if (off >= i_size) { - *retry_op = CHECK_EOF; - ret = i_size - *ki_pos; - *ki_pos = i_size; - } else { - ret = off - *ki_pos; - *ki_pos = off; - } + if (off >= i_size) { + *retry_op = CHECK_EOF; + ret = i_size - *ki_pos; + *ki_pos = i_size; + } else { + ret = off - *ki_pos; + *ki_pos = off; } if (last_objver)