On Thu, Dec 19, 2013 at 10:12:02AM -0700, Matthew Wilcox wrote:

... I think it'll actually be ext4_get_block_fault, not _write, and it
will include code to zero the returned blocks if they're uninitialised.

I assume what you mean here is if we see that the blocks are
uninitialized, we don't need to read from the persistent memory at
all; we can just map in a zeroed page, hopefully one from our stock of
pre-zeroed pages.  Yes?

						- Ted