[PATCH 18/29] btrfs: Fix race in btrfs_free_dummy_fs_info()

[Matthew Wilcox]

From: Matthew Wilcox <mawil...@microsoft.com>

We drop the lock which protects the radix tree, so we must call
radix_tree_iter_next() in order to avoid a modification to the tree
invalidating the iterator state.

Signed-off-by: Matthew Wilcox <mawil...@microsoft.com>
---
 fs/btrfs/tests/btrfs-tests.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/btrfs/tests/btrfs-tests.c b/fs/btrfs/tests/btrfs-tests.c
index bf62ad9..73076a0 100644
--- a/fs/btrfs/tests/btrfs-tests.c
+++ b/fs/btrfs/tests/btrfs-tests.c
@@ -162,6 +162,7 @@ void btrfs_free_dummy_fs_info(struct btrfs_fs_info *fs_info)
                                slot = radix_tree_iter_retry(&iter);
                        continue;
                }
+               slot = radix_tree_iter_next(&iter);
                spin_unlock(&fs_info->buffer_lock);
                free_extent_buffer_stale(eb);
                spin_lock(&fs_info->buffer_lock);
-- 
2.10.2