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drbd: add missing rcu locks around recently introduced idr_for_each 

Recent commit
 drbd: Move write_ordering from mdev to tconn
introduced a new idr_for_each loop over all volumes,
but did not take necessary rcu locks or krefs.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
This commit is contained in:
Lars Ellenberg 2011-11-17 14:32:12 +01:00 committed by Philipp Reisner
parent 03d63e1d1e
commit 615e087fbd
1 changed files with 20 additions and 12 deletions
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20
drivers/block/drbd/drbd_receiver.c
View File

@ -1096,22 +1096,30 @@ static void drbd_flush(struct drbd_tconn *tconn)
int vnr;
if (tconn->write_ordering >= WO_bdev_flush) {
rcu_read_lock();
idr_for_each_entry(&tconn->volumes, mdev, vnr) {
if (get_ldev(mdev)) {
rv = blkdev_issue_flush(mdev->ldev->backing_bdev, GFP_KERNEL,
NULL);
put_ldev(mdev);
if (!get_ldev(mdev))
continue;
kref_get(&mdev->kref);
rcu_read_unlock();
rv = blkdev_issue_flush(mdev->ldev->backing_bdev,
GFP_NOIO, NULL);
if (rv) {
dev_info(DEV, "local disk flush failed with status %d\n", rv);
/* would rather check on EOPNOTSUPP, but that is not reliable.
* don't try again for ANY return value != 0
* if (rv == -EOPNOTSUPP) */
drbd_bump_write_ordering(tconn, WO_drain_io);
}
put_ldev(mdev);
kref_put(&mdev->kref, &drbd_minor_destroy);
rcu_read_lock();
if (rv)
break;
}
}
}
rcu_read_unlock();
}
}