From: Dmitry Monakhov <dmonakhov@openvz.org>
Date: Sat, 22 Oct 2011 05:26:05 +0000 (-0400)
Subject: ext4: cleanup ext4_ext_grow_indepth code
X-Git-Tag: v3.2-rc1~85^2~38
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1939dd84b3f52e9c8d1b46dffae2058f16a3ff6a;p=pandora-kernel.git

ext4: cleanup ext4_ext_grow_indepth code

Currently code make an impression what grow procedure is very complicated
and some mythical paths, blocks are involved. But in fact grow in depth
it relatively simple procedure:
 1) Just create new meta block and copy root data to that block.
 2) Convert root from extent to index if old depth == 0
 3) Update root block pointer

This patch does:
 - Reorganize code to make it more self explanatory
 - Do not pass path parameter to new_meta_block() in order to
   provoke allocation from inode's group because top-level block
   should site closer to it's inode, but not to leaf data block.

   [ This happens anyway, due to logic in mballoc; we should drop
     the path parameter from new_meta_block() entirely.  -- tytso ]

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

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