Overlayfs TODO

Table of Contents Compliance Performance Testing Features

Compliance

• userns support (v4.7)
• SELinux support (v4.8)
• POSIX ACL fixes (v4.8..v4.9)
• File locks (v4.9)
• Redirect dir (v4.10)
• Unbreaking hardlinks (v4.13)
• NFS export (v4.16)
• Consistent rd/wr file descriptor (v4.19)
• For all layers on same fs:
  • Constant stat(2) st_ino/st_dev (v4.12)
  • Consistent getdents(2) d_ino (v4.14)
  • Sharing cache pages between lower and upper clones (???)
• For all layers not on same fs:
  • Constant stat(2) st_ino/st_dev (v4.15)
  • Consistent getdents(2) d_ino (v4.17)
  • Sharing cache pages between lower and upper copies (???)
• Consistent mmap read/write (???)

Performance

• Clone up (v4.10)
• Concurrent copy up (v4.11)

Testing

• Run generic xfstests on overlayfs
• Write xfstests overlayfs specific tests
• Write xfstests to cover all overlayfs non standard behavior issues
• xfstests mount cycle of base fs on -overlay run
  • xfstests mkfs of base fs on -overlay run
• unionmount-testsuite rotate layers
  • unionmount-testsuite configure rotate points
• Stress tests
• Performance regression tests
• Crash persistence tests

Features

• Offline layers check tool
• Offline/online layers merge tool
• Overlayfs snapshots (POC)