Re: Race between vmtruncate and mapped areas?

Dave McCracken
2003-05-13T23:28:20Z

--On Tuesday, May 13, 2003 16:20:38 -0700 William Lee Irwin III
<wli@holomorphy.com> wrote:

> The mmap_sem works because then ->i_size can't be sampled by
> filemap_nopage() before the pagetable wiping operation starts.

So why isn't that the right way to do it? Waiting for mmap_sem guarantees
we won't catch a page fault in flight, which is the cause of the problem in
the first place.

Dave

======================================================================
Dave McCracken IBM Linux Base Kernel Team 1-512-838-3059
dmccr@us.ibm.com T/L 678-3059