4.5.1 ext4: File system corruption occurs when both quota and dioread_nolock options are enabled

An issue with ext4 in Oracle Linux 8 results in file system corruption if unwritten extents are converted in IO completion so that they can be merged with siblings and both the dioread_nolock and quota options are enabled. This is a corner-case issue that exists in upstream code. A proposed patch is currently under review.

(Bug ID 29688421)