# 4.5.7

(released May 12, 2026)

* build.sh: fixup for azurelinux
* Further backports to improve the deadlock fix of `nfs_lock_and_join_requests`.
* Sync fallback to v4.0.40.


# 4.5.6

(released Apr 27, 2026)

- Added expandable read-ahead, and enabled by default. Read-ahead starts at 128 KB default and grows to `read_ahead_kb` setting only after sequential IO. Can be turned off via kernel module parameter.
- Backport upstream fix to a deadlock on rare cases (commit 8e5419d6542 "nfs: Add missing release on error in nfs_lock_and_join_requests()")


# 4.5.5

(released Mar 11, 2026)

- Fix a cleanup issue in umount under Linux kernels 6.16 and above that prevented driver reload.


# 4.5.4

(released Feb 12, 2026)

- For unsupported kernels, sync fallback logic to v4.0.39


# 4.5.3

(released Feb 11, 2026)

- Fix a build issue for systems with DOCA 3.2.1 and above, that prevented rpcrdma (NFS RDMA) from being loaded.


# 4.5.2

(released Jan 26, 2026)

- Trivial build fixes for newer kernels
- NFS directory cache fixes
- Fix performance regression from upstream related to directory listing
- Fix for `optlockflush` and `relmtime` activation with NFSv4.x
- Fix a crash on pnfs MDS=DS session trunking
- Add the `pconnect` mount option (see documentation)
- Enable `localports_failover` by default which `localports` is used
- Implement `localports` failover during mount stage
- `vastnfs-ctl` fixes for IO stats
- For unsupported kernels, sync fallback logic to v4.0.38
- Various tracing and debugability improvments
- Documentation updates


# 4.5.1

(released Oct 23, 2025)

- Build script fix.


# 4.5.0

(released Oct 23, 2025)

- First release of 4.5.0, a rebase of the stack on Linux v6.6 LTS, bringing newer stack features from that kernel. See [NFS over TLS](usage/tls.md).
- If installing for the first time, see [supported kernel versions](build/kernels.md).
- Contains 4.0.36 source as build-time fallback that is triggered based on kernel version detection.
- Older 4.0 tree will be maintained separately (see older [changelog](https://vastnfs.vastdata.com/docs/4.0/ChangeLog.html))
