From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1422794Ab3LFXQR (ORCPT ); Fri, 6 Dec 2013 18:16:17 -0500 Received: from youngberry.canonical.com ([91.189.89.112]:48590 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932197Ab3LFXQH (ORCPT ); Fri, 6 Dec 2013 18:16:07 -0500 From: Kamal Mostafa To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Cc: Mike Snitzer , Jens Axboe , Kamal Mostafa Subject: [PATCH 3.8 079/152] block: properly stack underlying max_segment_size to DM device Date: Fri, 6 Dec 2013 15:10:03 -0800 Message-Id: <1386371476-2477-80-git-send-email-kamal@canonical.com> X-Mailer: git-send-email 1.8.3.2 In-Reply-To: <1386371476-2477-1-git-send-email-kamal@canonical.com> References: <1386371476-2477-1-git-send-email-kamal@canonical.com> X-Extended-Stable: 3.8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.8.13.14 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Mike Snitzer commit d82ae52e68892338068e7559a0c0657193341ce4 upstream. Without this patch all DM devices will default to BLK_MAX_SEGMENT_SIZE (65536) even if the underlying device(s) have a larger value -- this is due to blk_stack_limits() using min_not_zero() when stacking the max_segment_size limit. 1073741824 before patch: 65536 after patch: 1073741824 Reported-by: Lukasz Flis Signed-off-by: Mike Snitzer Signed-off-by: Jens Axboe Signed-off-by: Kamal Mostafa --- block/blk-settings.c | 1 + 1 file changed, 1 insertion(+) diff --git a/block/blk-settings.c b/block/blk-settings.c index c50ecf0..5330933 100644 --- a/block/blk-settings.c +++ b/block/blk-settings.c @@ -144,6 +144,7 @@ void blk_set_stacking_limits(struct queue_limits *lim) lim->discard_zeroes_data = 1; lim->max_segments = USHRT_MAX; lim->max_hw_sectors = UINT_MAX; + lim->max_segment_size = UINT_MAX; lim->max_sectors = UINT_MAX; lim->max_write_same_sectors = UINT_MAX; } -- 1.8.3.2