btrfs: destroy qgroup extent records on transaction abort

We clean up the delayed references when we abort a transaction but we
leave the pending qgroup extent records behind, leaking memory.

This patch destroys the extent records when we destroy the delayed refs
and makes sure ensure they're gone before releasing the transaction.

Fixes: 3368d001ba5d ("btrfs: qgroup: Record possible quota-related extent for qgroup.")
CC: stable@vger.kernel.org # 4.4+
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Jeff Mahoney <jeffm@suse.com>
[ Rebased to latest upstream, remove to_qgroup() helper, use
  rbtree_postorder_for_each_entry_safe() wrapper ]
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 89422aa..d7fec89 100644 (file)
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -4276,6 +4276,7 @@ static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
                cond_resched();
                spin_lock(&delayed_refs->lock);
        }
+       btrfs_qgroup_destroy_extent_records(trans);
 
        spin_unlock(&delayed_refs->lock);
 

diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c
index 98d9a50..ff1870f 100644 (file)
--- a/fs/btrfs/qgroup.c
+++ b/fs/btrfs/qgroup.c
@@ -4002,3 +4002,16 @@ out:
        }
        return ret;
 }
+
+void btrfs_qgroup_destroy_extent_records(struct btrfs_transaction *trans)
+{
+       struct btrfs_qgroup_extent_record *entry;
+       struct btrfs_qgroup_extent_record *next;
+       struct rb_root *root;
+
+       root = &trans->delayed_refs.dirty_extent_root;
+       rbtree_postorder_for_each_entry_safe(entry, next, root, node) {
+               ulist_free(entry->old_roots);
+               kfree(entry);
+       }
+}

diff --git a/fs/btrfs/qgroup.h b/fs/btrfs/qgroup.h
index 236f122..1bc6544 100644 (file)
--- a/fs/btrfs/qgroup.h
+++ b/fs/btrfs/qgroup.h
@@ -414,5 +414,6 @@ int btrfs_qgroup_add_swapped_blocks(struct btrfs_trans_handle *trans,
                u64 last_snapshot);
 int btrfs_qgroup_trace_subtree_after_cow(struct btrfs_trans_handle *trans,
                struct btrfs_root *root, struct extent_buffer *eb);
+void btrfs_qgroup_destroy_extent_records(struct btrfs_transaction *trans);
 
 #endif

diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 33dcc88..beb6c69 100644 (file)
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -121,6 +121,8 @@ void btrfs_put_transaction(struct btrfs_transaction *transaction)
                BUG_ON(!list_empty(&transaction->list));
                WARN_ON(!RB_EMPTY_ROOT(
                                &transaction->delayed_refs.href_root.rb_root));
+               WARN_ON(!RB_EMPTY_ROOT(
+                               &transaction->delayed_refs.dirty_extent_root));
                if (transaction->delayed_refs.pending_csums)
                        btrfs_err(transaction->fs_info,
                                  "pending csums is %llu",