From: Jan Schmidt <list.btrfs@jan-o-sch.net>
Date: Wed, 20 Mar 2013 13:49:48 +0000 (+0000)
Subject: Btrfs: fix locking on ROOT_REPLACE operations in tree mod log
X-Git-Tag: v3.9-rc5~8^2~11
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d9abbf1c3131b679379762700201ae69367f3f62;p=pandora-kernel.git

Btrfs: fix locking on ROOT_REPLACE operations in tree mod log

To resolve backrefs, ROOT_REPLACE operations in the tree mod log are
required to be tied to at least one KEY_REMOVE_WHILE_FREEING operation.
Therefore, those operations must be enclosed by tree_mod_log_write_lock()
and tree_mod_log_write_unlock() calls.

Those calls are private to the tree_mod_log_* functions, which means that
removal of the elements of an old root node must be logged from
tree_mod_log_insert_root. This partly reverts and corrects commit ba1bfbd5
(Btrfs: fix a tree mod logging issue for root replacement operations).

This fixes the brand-new version of xfstest 276 as of commit cfe73f71.

Cc: stable@vger.kernel.org
Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
---

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