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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>,
	Paul Menzel <pmenzel@molgen.mpg.de>, Bob Liu <bob.liu@oracle.com>,
	Song Liu <songliubraving@fb.com>, Sasha Levin <sashal@kernel.org>,
	linux-block@vger.kernel.org
Subject: [PATCH AUTOSEL 4.14 05/22] block: keep bdi->io_pages in sync with max_sectors_kb for stacked devices
Date: Thu,  9 Apr 2020 23:50:27 -0400	[thread overview]
Message-ID: <20200410035044.9698-5-sashal@kernel.org> (raw)
In-Reply-To: <20200410035044.9698-1-sashal@kernel.org>

From: Konstantin Khlebnikov <khlebnikov@yandex-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@molgen.mpg.de>
Reviewed-by: Bob Liu <bob.liu@oracle.com>
Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 block/blk-settings.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/block/blk-settings.c b/block/blk-settings.c
index 6c2faaa38cc1e..e0a744921ed3d 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


  parent reply	other threads:[~2020-04-10  3:50 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-10  3:50 [PATCH AUTOSEL 4.14 01/22] null_blk: Fix the null_add_dev() error path Sasha Levin
2020-04-10  3:50 ` [PATCH AUTOSEL 4.14 02/22] null_blk: Handle null_add_dev() failures properly Sasha Levin
2020-04-10  3:50 ` [PATCH AUTOSEL 4.14 03/22] null_blk: fix spurious IO errors after failed past-wp access Sasha Levin
2020-04-10  3:50 ` [PATCH AUTOSEL 4.14 04/22] x86: Don't let pgprot_modify() change the page encryption bit Sasha Levin
2020-04-10  3:50 ` Sasha Levin [this message]
2020-04-10  3:50 ` [PATCH AUTOSEL 4.14 06/22] irqchip/versatile-fpga: Handle chained IRQs properly Sasha Levin
2020-04-10  3:50 ` [PATCH AUTOSEL 4.14 07/22] sched: Avoid scale real weight down to zero Sasha Levin
2020-04-10  3:50 ` [PATCH AUTOSEL 4.14 08/22] selftests/x86/ptrace_syscall_32: Fix no-vDSO segfault Sasha Levin
2020-04-10  3:50 ` [PATCH AUTOSEL 4.14 09/22] PCI/switchtec: Fix init_completion race condition with poll_wait() Sasha Levin
2020-04-10  3:50 ` [PATCH AUTOSEL 4.14 10/22] libata: Remove extra scsi_host_put() in ata_scsi_add_hosts() Sasha Levin
2020-04-10  3:50 ` [PATCH AUTOSEL 4.14 11/22] gfs2: Don't demote a glock until its revokes are written Sasha Levin
2020-04-10  3:50 ` [PATCH AUTOSEL 4.14 12/22] x86/boot: Use unsigned comparison for addresses Sasha Levin
2020-04-10  3:50 ` [PATCH AUTOSEL 4.14 13/22] efi/x86: Ignore the memory attributes table on i386 Sasha Levin
2020-04-10  3:50 ` [PATCH AUTOSEL 4.14 14/22] genirq/irqdomain: Check pointer in irq_domain_alloc_irqs_hierarchy() Sasha Levin
2020-04-10  3:50 ` [PATCH AUTOSEL 4.14 15/22] block: Fix use-after-free issue accessing struct io_cq Sasha Levin
2020-04-10  3:50 ` [PATCH AUTOSEL 4.14 16/22] usb: dwc3: core: add support for disabling SS instances in park mode Sasha Levin
2020-04-10  3:50 ` [PATCH AUTOSEL 4.14 17/22] irqchip/gic-v4: Provide irq_retrigger to avoid circular locking dependency Sasha Levin
2020-04-10  3:50 ` [PATCH AUTOSEL 4.14 18/22] locking/lockdep: Avoid recursion in lockdep_count_{for,back}ward_deps() Sasha Levin
2020-04-10  3:50 ` [PATCH AUTOSEL 4.14 19/22] block, bfq: fix use-after-free in bfq_idle_slice_timer_body Sasha Levin
2020-04-10  3:50 ` [PATCH AUTOSEL 4.14 20/22] btrfs: hold a ref on the root in btrfs_recover_relocation Sasha Levin
2020-04-10  3:50 ` [PATCH AUTOSEL 4.14 21/22] btrfs: remove a BUG_ON() from merge_reloc_roots() Sasha Levin
2020-04-10  3:50 ` [PATCH AUTOSEL 4.14 22/22] btrfs: track reloc roots based on their commit root bytenr Sasha Levin

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