linux-kernel - [PATCH 4.19 018/146] block: keep bdi->io_pages in sync with max_sectors

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Date:   Thu, 16 Apr 2020 15:22:39 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Paul Menzel <pmenzel@...gen.mpg.de>,
        Bob Liu <bob.liu@...cle.com>,
        Konstantin Khlebnikov <khlebnikov@...dex-team.ru>,
        Song Liu <songliubraving@...com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 018/146] block: keep bdi->io_pages in sync with max_sectors_kb for stacked devices

From: Konstantin Khlebnikov <khlebnikov@...dex-team.ru>

[ Upstream commit e74d93e96d721c4297f2a900ad0191890d2fc2b0 ]

Field bdi->io_pages added in commit 9491ae4aade6 ("mm: don't cap request
size based on read-ahead setting") removes unneeded split of read requests.

Stacked drivers do not call blk_queue_max_hw_sectors(). Instead they set
limits of their devices by blk_set_stacking_limits() + disk_stack_limits().
Field bio->io_pages stays zero until user set max_sectors_kb via sysfs.

This patch updates io_pages after merging limits in disk_stack_limits().

Commit c6d6e9b0f6b4 ("dm: do not allow readahead to limit IO size") fixed
the same problem for device-mapper devices, this one fixes MD RAIDs.

Fixes: 9491ae4aade6 ("mm: don't cap request size based on read-ahead setting")
Reviewed-by: Paul Menzel <pmenzel@...gen.mpg.de>
Reviewed-by: Bob Liu <bob.liu@...cle.com>
Signed-off-by: Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
Signed-off-by: Song Liu <songliubraving@...com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 block/blk-settings.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/block/blk-settings.c b/block/blk-settings.c
index be9b39caadbd2..01093b8f3e624 100644
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -717,6 +717,9 @@ void disk_stack_limits(struct gendisk *disk, struct block_device *bdev,
 		printk(KERN_NOTICE "%s: Warning: Device %s is misaligned\n",
 		       top, bottom);
 	}
+
+	t->backing_dev_info->io_pages =
+		t->limits.max_sectors >> (PAGE_SHIFT - 9);
 }
 EXPORT_SYMBOL(disk_stack_limits);
 
-- 
2.20.1