Earlier this week with the original Bcachefs pull request for Linux 6.9 Linus Torvalds wasn't happy with some of the code pertaining to spinning out a new library code so that it could be re-used by at least the XFS file-system. A revised pull request was since submitted without that library spin-out and Torvalds today went ahead and merged that updated file-system driver.

The revised Bcachefs pull request without the library code that upset Linus Torvalds has been merged for Linux 6.9. The Bcachefs improvements for this kernel cycle include:

- Subvolume children btree; this is needed for providing a userspace interface for walking subvolumes, which will come later
- Lots of improvements to directory structure checking
- Improved journal pipelining, significantly improving performance on high iodepth write workloads
- Discard path improvements: the discard path is more efficient, and no longer flushes the journal unnecessarily
- Buffered write path can now avoid taking the inode lock
- new mm helper: memalloc_flags_{save|restore}
- mempool now does kvmalloc mempools

The enhanced journal pipeline, discard improvements, and other optimizations are nice to see for this file-system that was originally merged back in Linux 6.7.

The full list of Bcachefs patches merged for Linux 6.9 can be found via the v2 pull request .