Question about dirty data for unlinked files

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If you delete a file (and don't have it open), and there's a bunch of
dirty data for that file still in page cache, does all that dirty data
disappear or does it still get written back?

I'm curious for performance reasons because I have an experimental
process I'm developing, and it has a habit of leaving large amounts of
dirty data in a huge output file.  I'd like to be able to unlink the
file and skip the writeback process once the file's been unlinked.



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