Chris Mason wrote:

On Thu, Feb 08, 2007 at 01:44:15AM +1100, David Chinner wrote:

quoted

So, do I need to grab the i_mutex here? Is that safe to do that in
the middle of a page fault? If we do race with a truncate and the
page is now beyond EOF, what am I supposed to return?

Should it check to make sure the page is still in the address space
after locking it?

Yes. If the page was truncated/invalidated, then you can just return
and the pagefault handler should notice that it has been removed from
the page tables.

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