diff options
Diffstat (limited to 'fs/btrfs/extent-tree.c')
| -rw-r--r-- | fs/btrfs/extent-tree.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 306e33d49602..de21e0c93eb6 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -9275,6 +9275,15 @@ int btrfs_drop_snapshot(struct btrfs_root *root, if (block_rsv) trans->block_rsv = block_rsv; + /* + * This will help us catch people modifying the fs tree while we're + * dropping it. It is unsafe to mess with the fs tree while it's being + * dropped as we unlock the root node and parent nodes as we walk down + * the tree, assuming nothing will change. If something does change + * then we'll have stale information and drop references to blocks we've + * already dropped. + */ + set_bit(BTRFS_ROOT_DELETING, &root->state); if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) { level = btrfs_header_level(root->node); path->nodes[level] = btrfs_lock_root_node(root); |