From: Dmitry Monakhov <dmonakhov@openvz.org>
Date: Sun, 31 Aug 2014 03:52:19 +0000 (-0400)
Subject: ext4: refactor ext4_move_extents code base
X-Git-Tag: fixes-against-v3.18-rc2~28^2~58
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fcf6b1b729bcd23f2b49a84fb33ffbb44712ee6a;p=pandora-kernel.git

ext4: refactor ext4_move_extents code base

ext4_move_extents is too complex for review. It has duplicate almost
each function available in the rest of other codebase. It has useless
artificial restriction orig_offset == donor_offset. But in fact logic
of ext4_move_extents is very simple:

Iterate extents one by one (similar to ext4_fill_fiemap_extents)
   ->Iterate each page covered extent (similar to generic_perform_write)
     ->swap extents for covered by page (can be shared with IOC_MOVE_DATA)

Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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