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)
• For all layers on same fs:
  • Constant stat(2) st_ino/st_dev (v4.12 ?)
  • Constant readdir(3) d_ino (???)
  • Unbreaking hardlinks (???)
  • NFS export (???)
  • Consistent rd/wr file descriptor (POC)
  • Verify lower dir by file handle (POC)

Performance

• Clone up (v4.10)
• Concurrent copy up (v4.11-rc1)

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 recycle layers
  • unionmount-testsuite configure recycle points
• Stress test

Features

• Recycle upper layer of mounted overlay (???)
  • Freeze support (POC)
• Offline/online layers merge tool
• Overlayfs snapshots (???)