Dentry world

• Dentry is a name to inode translation structure

• Cached agressively by VFS

• Eliminates lookups by FS & private caches

  • timing on Coda FS: ls -lR 1000 files after priming cache
    • linux 2.0.32: 7.2secs
    • linux 2.1.92: 0.6secs
  • disk fs: less benefit, NFS even more

• Negative entries!

• Namei is dramatically simplified

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