From: Matthew Wilcox <willy@linux.intel.com>
Date: Tue, 8 Sep 2015 21:59:20 +0000 (-0700)
Subject: ext4: add ext4_get_block_dax()
X-Git-Tag: omap-for-v4.3/fixes-rc1~54^2~120
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ed923b5776a2d2e949bd5b20f3956d68f3c826b7;p=pandora-kernel.git

ext4: add ext4_get_block_dax()

DAX wants different semantics from any currently-existing ext4 get_block
callback.  Unlike ext4_get_block_write(), it needs to honour the
'create' flag, and unlike ext4_get_block(), it needs to be able to
return unwritten extents.  So introduce a new ext4_get_block_dax() which
has those semantics.

We could also change ext4_get_block_write() to honour the 'create' flag,
but that might have consequences on other users that I do not currently
understand.

Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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