zfs-windows-2.4.4

[lundman]

These are the changes from upstream 2.4.1 to 2.4.4

L2ARC — substantial rework

• DWPD-based rate limiting with adaptive feed intervals (protects SSD endurance)
• Per-device parallel feed threads (was single-threaded feed)
• Persistent markers with consistent tail scanning + lazy reset flags + scan-based depth cap
• Even-depth multi-sublist scanning, write budget fairness (metadata no longer monopolizes)
• Rebuild bounded by write hand on first sweep; fixed a prev_hdr use-after-free

Performance

• Predict and throttle buffers dirtied by the sync context
• Batch object reallocation syncs in zfs receive
• Parallelize metaslab_sync_done(), dedup block cloning, and brt_pending_apply() across vdevs
• RAIDZ: optimize single data column writes; avoid extra abd_t allocations in RAIDZ/dRAID
• Bridge speculative and prescient prefetchers; bound user prefetch to a fraction of ARC

New features / CLI

• zpool condense — new verb
• zpool scrub -t — thorough scrub support
• zfs bookmark -r — recursive bookmark creation
• zpool initialize -z — write zeroes
• New dedupused/dedupsaved pool properties
• zoned_uid property (Linux container/namespace delegation — not applicable to us)
• FIDEDUPERANGE via block cloning
• zstream: major rework — multithreaded, new raw/drop_record/queue subcommands, memory tracking

Data-integrity fixes (the ones that matter most)

• Fix read corruption after block-clone-after-truncate
• Fix double free for blocks cloned after DDT prune
• draid: fix data corruption after disk clear; fix checksum errors after rebuild with degraded disks; fix import
  failure after disk replacement
• Prevent range-tree corruption race in dnode_sync()
• z_seq now persists across znode eviction — fixes the VMware ESXi-over-NFS "file specified is not a virtual disk" bug
  (Linux/FreeBSD only for now, per our earlier gap analysis)
• DDT: multiple pruning bugs fixed (including negative time overflow)
• Fix off-by-one in PREVIOUSLY_REDACTED handling that dropped the last block

Security hardening

• vdev_open/zfs_file_open/vdev_file/vdev_disk: now check the calling credential instead of always using kcred (we
  ported the Windows side of this yesterday)
• Additional verification of size fields and strings in the receive path
• Hardened receive record validation
• secpolicy_nfs removed; secpolicy_zinject/secpolicy_sys_config restricted to global-zone credentials

Deadlock/hang fixes

• Fix deadlock on dmu_tx_assign() from vdev_rebuild()
• Fix snapshot automount deadlock during concurrent zfs recv
• Fix self-deadlock setting the vdev allocating/path property
• Fix race between device-removal completion and pool export
• zfs_ioctl: fix EBUSY race between quota queries and mount (we ported this too)
• arc: fix race between arc_release() and arc_read_done()

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This discussion was created from the release zfs-windows-2.4.4rc1.

[lundman]

Right so hmm, remind me if you have an issue yet to be solved - I have run out of things to work on....

[lundman]

Some minor Explorer integration so that any previous versions of a file in snapshots are available.