iomap writeback

The iomap writeback tag covers discussions about the Linux kernel's iomap subsystem, which maps file-backed memory to block I/O, and its writeback process that flushes dirty pages or folios to storage. A key topic is CVE-2022-50406, a memory corruption bug in the iomap writeback path that could misreport I/O errors. This vulnerability was fixed in the kernel but only formally recorded in public CVE feeds later. The tag is relevant for users and administrators interested in Linux kernel internals, storage I/O, memory management, and security vulnerabilities affecting writeback operations.