From: Jan Schmidt <list.btrfs@jan-o-sch.net>
Date: Tue, 15 May 2012 15:55:51 +0000 (+0200)
Subject: Btrfs: bugfix: ignore the wrong key for indirect tree block backrefs
X-Git-Tag: v3.5-rc1~17^2^2~18
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d5c88b735fdf2ef796bb937396dd58dac84e8407;p=pandora-kernel.git

Btrfs: bugfix: ignore the wrong key for indirect tree block backrefs

The key we store with a tree block backref is only a hint. It is set when
the ref is created and can remain correct for a long time. As the tree is
rebalanced, however, eventually the key no longer points to the correct
destination.

With this patch, we change find_parent_nodes to no longer add keys unless it
knows for sure they're correct (e.g. because they're for an extent data
backref). Then when we later encounter a backref ref with no parent and no
key set, we grab the block and take the first key from the block itself.

Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
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