zygo: btrfs: check for dead roots

(cherry picked from commit 1d9c5ddd8e5e71c9aeeca8cc516ed713ce0281b9)

diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
index 64b818f9f315835a9543a56907293f2dc6b01e34..457a5743f7189ad361ac0b605586216d843cd9da 100644 (file)
--- a/fs/btrfs/relocation.c
+++ b/fs/btrfs/relocation.c
@@ -4792,6 +4792,11 @@ int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans,
        if (!root->reloc_root || !rc)
                return 0;
 
+       if (test_bit(BTRFS_ROOT_DEAD_RELOC_TREE, &root->reloc_root->state)) {
+               WARN_ON(1);
+               return 0;
+       }
+
        rc = root->fs_info->reloc_ctl;
        rc->merging_rsv_size += rc->nodes_relocated;