The bcachefs-tools 1.35 changes come down to the following noted in the release change-log:
## v1.35.0 - Mon Jan 12 2026
bcachefs_metadata_version_bucket_stripe_index
- The requirement that devices must have matched bucket sizes to be members of the same stripes has been removed.
- Stripes may be reshaped (number of blocks increased or decreased), as needed; this improves EC's handling of device failures.
- Significantly improved evacuate, rereplicate performance on rotating disks: we now launch one thread per device being read from (i.e. every device that shared data with the device going away); each device is read from in parallel with reads across the whole device done in sorted order.
- `backpointer_scan_iter`, for improved performance for code doing backpointer -> extent walks, including but not limited to reconcile; this is quite significant on systems with metadata on rotating disk and relatively limited memory.
- The bug with reconcile where btree roots wouldn't be processed has been fixed.
- A few bugs with reconcile's handling of cached data have been fixed.
- The reconcile tracepoints, especially `reconcile_set_pending`, now give significantly more information.
- Reconcile now knows how to wait on copygc when a device it wants to write to is full, rather than (incorrectly) marking the extent as pending.
- Fixed several memory reclaim recursion bugs; performance under memory pressure should be improved.
- Various allocation watermark fixes; btree updates now only run with high priority watermarks when necessary. This fixes some allocator deadlocks on open bucket allocation.
- 'encoded_extent_max` settings of 1MB and greater now work properly; previously, this could cause backpointer issues if compression was enabled.
Some nice work in this new bcachefs-tools release, especially the much-improved evaluate and rereplicate performance on rotating media along with all of the other changes.
Bcachefs-tools 1.35 can be downloaded via the project's Git repository .
In case you missed it during the busy month of December, over in kernel space, Bcachefs is ready with its reconcile feature as the file-system's biggest change in the past two years.