Re: Cached IO Synchronization Question

[Matt Klein]

> 
> Note how do_generic_file_read() checks PageUptodate() and does a
> lock_page_killable() in case its not.
> 
> 
> 

As far as I can tell there is nothing to prevent the page from becoming
out of date (or someone doing a full page cached write) after the
PageUptodate() check returns up to date.

So I have concluded that cached read/write interleaving is not
synchronized. This is the behavior found on Windows.
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