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-rw-r--r--fs/btrfs/ctree.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 5912a97b07a6..72745235896f 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -1440,6 +1440,10 @@ noinline int btrfs_cow_block(struct btrfs_trans_handle *trans,
u64 search_start;
int ret;
+ if (test_bit(BTRFS_ROOT_DELETING, &root->state))
+ btrfs_err(fs_info,
+ "COW'ing blocks on a fs root that's being dropped");
+
if (trans->transaction != fs_info->running_transaction)
WARN(1, KERN_CRIT "trans %llu running %llu\n",
trans->transid,