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SubjectRe: [PATCH] [Request for inclusion] Filesystem in Userspace
> 1) not allowing share writable mappings 
>In the first case there will never be dirty data, since normal writes
>go synchronously through the page cache.

A normal write is a VFS write() call, I assume. While they're going
through the page cache, the pages are dirty, right? Is it possible that
FUSE needs more real memory after dirtying those pages in order to finish
cleaning them?

What about the 3rd case: private writable mapping? How does that work?

Bryan Henderson IBM Almaden Research Center
San Jose CA Filesystems
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