adding extent metadata (most importantly ownership) to the device block as a secondary source of metadata. More Here:4. XFS Online Fsck Design — The Linux Kernel documentation
Enable FITRIM (batched Trim command) on the realtime device [1]
First FS to allow bigger block size than system page size. More here
Adds New Ioctls (system call) To Swap Contents Of Two Files [2]
The XFS realtime device is a special mode intended to provide consistent and predictable latency for filesystem operations. In 6.14 the realtime device has gained support for #Reverse Mapping (mapping a device block to the file the contains it) and reflink (sharing blocks between files, based on Reverse Mapping) operations.[3]