Chapter 9. File Systems

SMB 2 and SMB 3 now support DFS

Distributed File System (DFS), which was previously supported only with the Server Message Block (SMB) protocol version 1, is now also supported in SMB 2 and SMB 3.
With this update, you can now mount DFS shares using the SMB 2 and SMB 3 protocols. (BZ#1481303)

File system DAX now performs better when mapping a large amount of memory

Prior to this enhancement, the Direct Access (DAX) feature mapped only 4KiB entries into application address space. This had a negative performance impact on workloads that mapped large amounts of memory, because it increased Translation Lookaside Buffer (TLB) pressure. With this update, the kernel supports 2MiB Page Middle Directory (PMD) faults in persistent memory mappings. This significantly reduces TLB pressure, and file system DAX now performs better when mapping a large amount of memory. (BZ#1457572)

quotacheck is now faster on ext4

The quotacheck utility now directly scans ext4 file system metadata instead of analyzing each individual file for occupied disk size. If the file system contains many files, quota initialization and quota check are now significantly faster. (BZ#1393849)