[PATCH v4 08/28] netfs: Provide readahead and readpage netfs helpers

[David Howells]

I'm going to make the code generate more information when warning about a
subread reporting having over-read (see attached).

David
---
diff --git a/fs/netfs/read_helper.c b/fs/netfs/read_helper.c
index ce11ca4c32e4..765e88ee132d 100644
--- a/fs/netfs/read_helper.c
+++ b/fs/netfs/read_helper.c
@@ -641,7 +641,10 @@ void netfs_subreq_terminated(struct netfs_read_subrequest *subreq,
 		goto failed;
 	}
 
-	if (WARN_ON(transferred_or_error > subreq->len - subreq->transferred))
+	if (WARN(transferred_or_error > subreq->len - subreq->transferred,
+		 "R%x[%x] %zd > %zu - %zu",
+		 rreq->debug_id, subreq->debug_index,
+		 transferred_or_error, subreq->len, subreq->transferred))
 		transferred_or_error = subreq->len - subreq->transferred;
 
 	subreq->error = 0;