linux-kernel - [PATCH AUTOSEL 5.6 29/68] block: keep bdi->io_pages in sync with max_sectors

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Date:   Thu,  9 Apr 2020 23:45:54 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Konstantin Khlebnikov <khlebnikov@...dex-team.ru>,
        Paul Menzel <pmenzel@...gen.mpg.de>,
        Bob Liu <bob.liu@...cle.com>, Song Liu <songliubraving@...com>,
        Sasha Levin <sashal@...nel.org>, linux-block@...r.kernel.org
Subject: [PATCH AUTOSEL 5.6 29/68] 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 c8eda2e7b91e4..be1dca0103a45 100644
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -664,6 +664,9 @@ 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