Zach Brown writes:
But couldn't we use make_pages_present() to figure which locks we need,
sort them, and then grab them?
Doh, obviously we can't as nopage() needs to bring the page in. Sorry about
that.
I also thought of another failure case for the vma walk. When a thread uses
userspace memcpy() between two clusterfs mmap'd regions instead of write()
or read().
Pekka
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