md: make ->congested robust against personality changes.

There is currently no locking around calls to the 'congested'
bdi function.  If called at an awkward time while an array is
being converted from one level (or personality) to another, there
is a tiny chance of running code in an unreferenced module etc.

So add a 'congested' function to the md_personality operations
structure, and call it with appropriate locking from a central
'mddev_congested'.

When the array personality is changing the array will be 'suspended'
so no IO is processed.
If mddev_congested detects this, it simply reports that the
array is congested, which is a safe guess.
As mddev_suspend calls synchronize_rcu(), mddev_congested can
avoid races by included the whole call inside an rcu_read_lock()
region.
This require that the congested functions for all subordinate devices
can be run under rcu_lock.  Fortunately this is the case.

Signed-off-by: NeilBrown <neilb@suse.de>

1 files changed, 20 insertions, 2 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 17e7fd776034..d45f52edb314 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -321,9 +321,23 @@ EXPORT_SYMBOL_GPL(mddev_resume);
 
 int mddev_congested(struct mddev *mddev, int bits)
 {
-        return mddev->suspended;
+        struct md_personality *pers = mddev->pers;
+        int ret = 0;
+
+        rcu_read_lock();
+        if (mddev->suspended)
+                ret = 1;
+        else if (pers && pers->congested)
+                ret = pers->congested(mddev, bits);
+        rcu_read_unlock();
+        return ret;
+}
+EXPORT_SYMBOL_GPL(mddev_congested);
+static int md_congested(void *data, int bits)
+{
+        struct mddev *mddev = data;
+        return mddev_congested(mddev, bits);
 }
-EXPORT_SYMBOL(mddev_congested);
 
 /*
  * Generic flush handling for md
@@ -4908,6 +4922,10 @@ int md_run(struct mddev *mddev)
                 bitmap_destroy(mddev);
                 return err;
         }
+        if (mddev->queue) {
+                mddev->queue->backing_dev_info.congested_data = mddev;
+                mddev->queue->backing_dev_info.congested_fn = md_congested;
+        }
         if (mddev->pers->sync_request) {
                 if (mddev->kobj.sd &&
                     sysfs_create_group(&mddev->kobj, &md_redundancy_group))