On Thu, Jan 26, 2017 at 07:44:39AM -0800, Matthew Wilcox wrote:

On Thu, Jan 26, 2017 at 02:57:48PM +0300, Kirill A. Shutemov wrote:

quoted

For filesystems that wants to be write-notified (has mkwrite), we will
encount write-protection faults for huge PMDs in shared mappings.

The easiest way to handle them is to clear the PMD and let it refault as
wriable.

... of course, the filesystem could implement ->pmd_fault, and then it
wouldn't hit this case ...

I would rather get rid of ->pmd_fault/->huge_fault :)

->fault should be flexible enough to provide for all of them...

-- 
 Kirill A. Shutemov

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