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md: restore 'noio_flag' for the last mddev_resume()

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[ Upstream commit e24ed04389 ]

memalloc_noio_save() is called for the first mddev_suspend(), and
repeated mddev_suspend() only increase 'suspended'. However,
memalloc_noio_restore() is also called for the first mddev_resume(),
which means that memory reclaim will be enabled before the last
mddev_resume() is called, while the array is still suspended.

Fix this problem by restore 'noio_flag' for the last mddev_resume().

Fixes: 78f57ef9d5 ("md: use memalloc scope APIs in mddev_suspend()/mddev_resume()")
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Link: https://lore.kernel.org/r/20230628012931.88911-3-yukuai1@huaweicloud.com
Signed-off-by: Song Liu <song@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Yu Kuai
2023-06-28 09:29:31 +08:00
committed by Greg Kroah-Hartman
parent 835cbfebc1
commit 097f30f0ce
1 changed files with 4 additions and 2 deletions
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6
drivers/md/md.c
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@@ -485,11 +485,13 @@ EXPORT_SYMBOL_GPL(mddev_suspend);
void mddev_resume(struct mddev *mddev) void mddev_resume(struct mddev *mddev)
{ {
/* entred the memalloc scope from mddev_suspend() */
memalloc_noio_restore(mddev->noio_flag);
lockdep_assert_held(&mddev->reconfig_mutex); lockdep_assert_held(&mddev->reconfig_mutex);
if (--mddev->suspended) if (--mddev->suspended)
return; return;
/* entred the memalloc scope from mddev_suspend() */
memalloc_noio_restore(mddev->noio_flag);
percpu_ref_resurrect(&mddev->active_io); percpu_ref_resurrect(&mddev->active_io);
wake_up(&mddev->sb_wait); wake_up(&mddev->sb_wait);
mddev->pers->quiesce(mddev, 0); mddev->pers->quiesce(mddev, 0);