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md-cluster: fix safemode_delay value when converting to clustered bitmap 

When array convert to clustered bitmap, the safe_mode_delay doesn't
clean and vice versa. the /sys/block/mdX/md/safe_mode_delay keep original
value after changing bitmap type. In safe_delay_store(), the code forbids
setting mddev->safemode_delay when array is clustered. So in cluster-md
env, the expected safemode_delay value should be 0.

Reproducible steps:
```
node1 # mdadm --zero-superblock /dev/sd{b,c,d}
node1 # mdadm -C /dev/md0 -b internal -e 1.2 -n 2 -l mirror /dev/sdb /dev/sdc
node1 # cat /sys/block/md0/md/safe_mode_delay
0.204
node1 # mdadm -G /dev/md0 -b none
node1 # mdadm --grow /dev/md0 --bitmap=clustered
node1 # cat /sys/block/md0/md/safe_mode_delay
0.204  <== doesn't change, should ZERO for cluster-md

node1 # mdadm --zero-superblock /dev/sd{b,c,d}
node1 # mdadm -C /dev/md0 -b clustered -e 1.2 -n 2 -l mirror /dev/sdb /dev/sdc
node1 # cat /sys/block/md0/md/safe_mode_delay
0.000
node1 # mdadm -G /dev/md0 -b none
node1 # cat /sys/block/md0/md/safe_mode_delay
0.000  <== doesn't change, should default value
```

Reviewed-by: NeilBrown <neilb@suse.de>
Signed-off-by: Zhao Heming <heming.zhao@suse.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
This commit is contained in:
Zhao Heming 2020-07-21 02:08:52 +08:00 committed by Song Liu
parent 3b5408b98e
commit 7c9d5c54fb
1 changed files with 9 additions and 2 deletions
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11
drivers/md/md.c
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@ -101,6 +101,8 @@ static void mddev_detach(struct mddev *mddev);
* count by 2 for every hour elapsed between read errors.
*/
#define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
/* Default safemode delay: 200 msec */
#define DEFAULT_SAFEMODE_DELAY ((200 * HZ)/1000 +1)
/*
* Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
* is 1000 KB/sec, so the extra system load does not show up that much.
@ -6034,7 +6036,7 @@ int md_run(struct mddev *mddev)
if (mddev_is_clustered(mddev))
mddev->safemode_delay = 0;
else
mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
mddev->safemode_delay = DEFAULT_SAFEMODE_DELAY;
mddev->in_sync = 1;
smp_wmb();
spin_lock(&mddev->lock);
@ -7413,6 +7415,7 @@ static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
mddev->bitmap_info.nodes = 0;
md_cluster_ops->leave(mddev);
mddev->safemode_delay = DEFAULT_SAFEMODE_DELAY;
}
mddev_suspend(mddev);
md_bitmap_destroy(mddev);
@ -8408,6 +8411,7 @@ EXPORT_SYMBOL(unregister_md_cluster_operations);
int md_setup_cluster(struct mddev *mddev, int nodes)
{
int ret;
if (!md_cluster_ops)
request_module("md-cluster");
spin_lock(&pers_lock);
@ -8419,7 +8423,10 @@ int md_setup_cluster(struct mddev *mddev, int nodes)
}
spin_unlock(&pers_lock);
return md_cluster_ops->join(mddev, nodes);
ret = md_cluster_ops->join(mddev, nodes);
if (!ret)
mddev->safemode_delay = 0;
return ret;
}
void md_cluster_stop(struct mddev *mddev)