chore: release v0.2.0

[XciD]

Release v0.2.0

This release includes bug fixes and performance improvements, primarily focused on fixing race conditions and resource management issues.

Bug Fixes

• Fixed rename Phase 3 failure after remote mutation (fix: tolerate rename Phase 3 failure after remote mutation #77)
• Fixed inode size race in setattr truncate operations (fix: serialize setattr truncate with write to prevent inode size race #76)
• Fixed apply_commit clobbering size/hash on generation mismatch (fix: prevent apply_commit from clobbering size/hash on generation mismatch #75)
• Fixed poll incorrectly deleting inodes with open file handles (fix: prevent poll from deleting inodes with open file handles #74)
• Fixed file descriptor exhaustion on bulk NFS deletes (fix: prevent file descriptor exhaustion on bulk NFS deletes #68)
• Fixed NFS exclusive create scheduling for empty files (fix: schedule flush after NFS exclusive create with empty files #71)
• Fixed TOCTOU race in poll dirty status check (fix: re-check dirty status before poll deletes inode (TOCTOU race) #67)

Performance Improvements

• Chunked upload_files to bound FD usage during flush (perf: chunk upload_files to bound FD usage during flush #72)
• Skipped redundant HEAD revalidation after flush commit (perf: skip redundant HEAD revalidation after flush commit #73)

See commit history for full details.

[github-actions]

POSIX Compliance (pjdfstest)

============================================================
  pjdfstest POSIX Compliance Results
------------------------------------------------------------
  Files: 130/130 passed    Tests: 832 total (0 subtests failed)
  Result: PASS
------------------------------------------------------------
  Category               Passed    Total   Status
  -------------------- -------- -------- --------
  chflags                     5        5       OK
  chmod                       8        8       OK
  chown                       6        6       OK
  ftruncate                  13       13       OK
  granular                    5        5       OK
  mkdir                       9        9       OK
  open                       19       19       OK
  posix_fallocate             1        1       OK
  rename                     10       10       OK
  rmdir                      11       11       OK
  symlink                    10       10       OK
  truncate                   13       13       OK
  unlink                     11       11       OK
  utimensat                   9        9       OK
============================================================

[github-actions]

Benchmark Results

============================================================
  Benchmark — 50MB
------------------------------------------------------------
  Metric                                 FUSE          NFS
  ------------------------------ ------------ ------------
  Sequential read                    192.7 MB/s     226.0 MB/s
  Sequential re-read                1553.0 MB/s    2349.7 MB/s
  Range read (1MB@25MB)               37.8 ms         0.2 ms
  Random reads (100x4KB avg)          33.3 ms         0.0 ms
  Sequential write (FUSE)           1418.7 MB/s
  Close latency (CAS+Hub)            1.015 s
  Write end-to-end                    47.6 MB/s
  Dedup write                       1529.9 MB/s
  Dedup close latency                0.206 s
  Dedup end-to-end                   209.4 MB/s
============================================================
============================================================
  Benchmark — 200MB
------------------------------------------------------------
  Metric                                 FUSE          NFS
  ------------------------------ ------------ ------------
  Sequential read                   1090.2 MB/s     513.9 MB/s
  Sequential re-read                1736.4 MB/s    2282.7 MB/s
  Range read (1MB@25MB)               34.8 ms         0.2 ms
  Random reads (100x4KB avg)          34.8 ms         0.0 ms
  Sequential write (FUSE)           1571.7 MB/s
  Close latency (CAS+Hub)            0.108 s
  Write end-to-end                   850.1 MB/s
  Dedup write                       1603.9 MB/s
  Dedup close latency                0.471 s
  Dedup end-to-end                   335.9 MB/s
============================================================
============================================================
  Benchmark — 500MB
------------------------------------------------------------
  Metric                                 FUSE          NFS
  ------------------------------ ------------ ------------
  Sequential read                   1573.9 MB/s    1394.1 MB/s
  Sequential re-read                1645.1 MB/s    2412.5 MB/s
  Range read (1MB@25MB)               33.9 ms         0.2 ms
  Random reads (100x4KB avg)          33.4 ms         0.0 ms
  Sequential write (FUSE)           1349.4 MB/s
  Close latency (CAS+Hub)            0.223 s
  Write end-to-end                   843.1 MB/s
  Dedup write                       1420.8 MB/s
  Dedup close latency                0.107 s
  Dedup end-to-end                  1089.5 MB/s
============================================================
============================================================
  fio Benchmark Results
------------------------------------------------------------
  Job                        FUSE MB/s   NFS MB/s  FUSE IOPS   NFS IOPS
  ------------------------- ---------- ---------- ---------- ----------
  seq-read-100M                  386.1      411.5                      
  seq-reread-100M               2325.6      333.3                      
  rand-read-4k-100M                0.1        0.1         17         19
  seq-read-5x10M                 568.2      714.3                      
  rand-read-10x1M                  0.1        0.1         35         36
  Random Read Latency           FUSE avg      NFS avg
  ------------------------- ------------ ------------
  rand-read-4k-100M           57488.9 us   53494.7 us
  rand-read-10x1M             28257.2 us   27920.0 us
============================================================