From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Sasha Levin To: "stable@vger.kernel.org" , "linux-kernel@vger.kernel.org" CC: Mike Snitzer , Jens Axboe , Sasha Levin Subject: [PATCH AUTOSEL 4.14 21/67] block: allow max_discard_segments to be stacked Date: Fri, 7 Sep 2018 00:37:34 +0000 Message-ID: <20180907003716.57737-21-alexander.levin@microsoft.com> References: <20180907003716.57737-1-alexander.levin@microsoft.com> In-Reply-To: <20180907003716.57737-1-alexander.levin@microsoft.com> Content-Language: en-US Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: From: Mike Snitzer [ Upstream commit 42c9cdfe1e11e083dceb0f0c4977b758cf7403b9 ] Set max_discard_segments to USHRT_MAX in blk_set_stacking_limits() so that blk_stack_limits() can stack up this limit for stacked devices. before: $ cat /sys/block/nvme0n1/queue/max_discard_segments 256 $ cat /sys/block/dm-0/queue/max_discard_segments 1 after: $ cat /sys/block/nvme0n1/queue/max_discard_segments 256 $ cat /sys/block/dm-0/queue/max_discard_segments 256 Fixes: 1e739730c5b9e ("block: optionally merge discontiguous discard bios i= nto a single request") Reviewed-by: Christoph Hellwig Signed-off-by: Mike Snitzer Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin --- block/blk-settings.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/block/blk-settings.c b/block/blk-settings.c index 8559e9563c52..474b0b95fcd1 100644 --- a/block/blk-settings.c +++ b/block/blk-settings.c @@ -128,7 +128,7 @@ void blk_set_stacking_limits(struct queue_limits *lim) =20 /* Inherit limits from component devices */ lim->max_segments =3D USHRT_MAX; - lim->max_discard_segments =3D 1; + lim->max_discard_segments =3D USHRT_MAX; lim->max_hw_sectors =3D UINT_MAX; lim->max_segment_size =3D UINT_MAX; lim->max_sectors =3D UINT_MAX; --=20 2.17.1