XFS Updates Submitted For Linux 4.1 Kernel
Written by Michael Larabel in Linux Storage on 23 April 2015 at 08:01 AM EDT. 4 Comments
LINUX STORAGE --
Dave Chinner has sent in his XFS file-system updates targeting the Linux 4.1 kernel.

Highlights of the XFS file-system update for Linux 4.1 are:

- RENAME_WHITEOUT support. Chinner explains this feature as, "Whiteouts are used by overlayfs - it has a crazy convention that a whiteout is a character device inode with a major:minor of 0:0. Because it's not documented anywhere...
In XFS rename terms, the operation that has been done is that source (foo) has been moved to the target (bar), which is like a normal rename operation, but rather than the source being removed, it have been replaced with a whiteout."

- The per-CPU superblock accounting has been changed to use generic counters.

- A new inode mmap lock to lock page faults.

- A rework of direct I/O submission and completion to take care of some data corruption issues under DIO writes.

- FALLOC_FL_INSERT_RANGE support to insert holes into a file via direct extent manipulation.

- Message logging improvements in case of problems.

- Bug-fixes and other code clean-ups.

The pull request in full can be viewed via the kernel mailing list.
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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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