... operations.¹

The UCLA stackable file system replaced the static UNIX vnode interface with a dynamic interface that allowed file system developers to introduce new operations[6].

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... example²

The example is simplified because it does not take into account sparse files, and appending to files.

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... prototype³

https://www.kvack.org/~blah/lofs/

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... developed.⁴

We submitted our small changes and expect that they will be included in a future version of Linux.

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....⁵

All machines used in these tests had 32MB RAM.

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