* Introduce *extent scan mode* that scans the extent tree directly. It is the
new default scan mode.
* Show estimated data size and expected time to finish scanning in logs and
status outputs.
* Smarter dedupe criteria that prevents dedupe operations that save less than
half the blocks in an extent or require more than 100 copy/dedupe operations
to free space.
* Add the new dynamic rate throttling option `--throttle-factor` to estimate
the rate at which the kernel deletes extents and slow down dedupe requests
to match this rate.
* Threads now dynamically redistribute their work so that they can make
continuous progress without waiting for each other.
* Remove excessively costly "toxic extent" workarounds yielding up to
100x–1000x speed boost on some workloads.
* Coordinate between threads to prevent thrashing during disk reads.
* Prefetche data into page-cache before dedupe calls.
* Submit full-extent dedupe operations, avoiding obsolete 16M kernel limits.
* Reduce the size of `ioctl` buffers, which avoids forcing the kernel to
evict pages from memory to accommodate large buffers.
* Limit reference counts for very frequently duplicated data, which avoids
performance issues in btrfs (even when bees is not running).
* Use the new `openat2` system call for improved robustness against rename and
symlink attacks.
* Use a private mount namespace for isolation even without `systemd`.
* Recude warning and debug log verbosity.
* `SIGUSR1` and `SIGUSR2` signals allow bees to be paused and unpaused without
preventing bees from closing open files and subvols during the pause.
* It is now safe to locate `$BEESHOME` on filesystems such as XFS that lack
data flushing on `rename`.
* Fix 32-bit `ioctl` compatibility for mixed 32/64-bit systems.
* Detect a `btrfs send` in progress, and wait for it to complete
automatically. `--workaround-btrfs-send` is no longer necessary when used
with extent scan mode.
OBS-URL: https://build.opensuse.org/package/show/filesystems/bees?expand=0&rev=30
