[PATCH 6/6] btrfs: send: remove BUG_ON from name_cache_delete

[David Sterba <dsterba@suse.cz>]

If cleaning the name cache fails, we could try to proceed at the cost of
some memory leak. This is not expected to happen often.

Signed-off-by: David Sterba <dsterba@suse.cz>
---
 fs/btrfs/send.c |   11 +++++++++--
 1 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c
index b0bf4ff40b5b..7b17b778eaf7 100644
--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -1849,13 +1849,20 @@ static void name_cache_delete(struct send_ctx *sctx,
 
 	nce_head = radix_tree_lookup(&sctx->name_cache,
 			(unsigned long)nce->ino);
-	BUG_ON(!nce_head);
+	if (!nce_head) {
+		btrfs_err(sctx->send_root->fs_info,
+	      "name_cache_delete lookup failed ino %llu cache size %d, leaking memory",
+			nce->ino, sctx->name_cache_size);
+	}
 
 	list_del(&nce->radix_list);
 	list_del(&nce->list);
 	sctx->name_cache_size--;
 
-	if (list_empty(nce_head)) {
+	/*
+	 * We may not get to the final release of nce_head if the lookup fails
+	 */
+	if (nce_head && list_empty(nce_head)) {
 		radix_tree_delete(&sctx->name_cache, (unsigned long)nce->ino);
 		kfree(nce_head);
 	}
-- 
1.7.9