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Subject[PATCH -next 24/29] md: suspend array in md_start_sync() if array need reconfiguration
Date
From: Yu Kuai <yukuai3@huawei.com>

So that io won't concurrent with array reconfiguration, and now that
all callers of md_kick_rdev_from_array() suspend the array, change the
second parameter to true and prepare to remove the mddev_suspend() from
mddev_create/destroy_serial_pool().

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
drivers/md/md.c | 13 +++++++++++++
1 file changed, 13 insertions(+)

diff --git a/drivers/md/md.c b/drivers/md/md.c
index d5c061c87b2e..9bfa15b2fa97 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -9358,12 +9358,20 @@ static void md_start_sync(struct work_struct *ws)
{
struct mddev *mddev = container_of(ws, struct mddev, sync_work);
int spares = 0;
+ bool suspended = false;
+
+ if (md_spares_need_change(mddev)) {
+ __mddev_suspend(mddev);
+ suspended = true;
+ }

mddev_lock_nointr(mddev);

if (!md_is_rdwr(mddev)) {
remove_and_add_spares(mddev);
mddev_unlock(mddev);
+ if (suspended)
+ __mddev_resume(mddev);
return;
}

@@ -9412,6 +9420,9 @@ static void md_start_sync(struct work_struct *ws)
}

mddev_unlock(mddev);
+ if (suspended)
+ __mddev_resume(mddev);
+
md_wakeup_thread(mddev->sync_thread);
sysfs_notify_dirent_safe(mddev->sysfs_action);
md_new_event();
@@ -9424,6 +9435,8 @@ static void md_start_sync(struct work_struct *ws)
clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
mddev_unlock(mddev);
+ if (suspended)
+ __mddev_resume(mddev);

wake_up(&resync_wait);
if (test_and_clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery) &&
--
2.39.2
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