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SubjectRe: [RFC] Union Mount: Readdir approaches

Hello Jeff,

"Josef 'Jeff' Sipek":
> Unless I missunderstood something, Unionfs uses the same approach. Even
> Unionfs's ODF branch does the same thing. The major difference is that we
> keep the cache in a file on a disk.

The approach unionfs-2.1.2 took differs from mine.
Major difference is,
- in this approach, the cache in struct file is the completed virtual
disk block for the dir.
- readdir doesn't have to call vfs_readdir when the cache exists and is
valid. simply calls filldir.
- it supports SEEK_END.

Junjiro Okajima
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