From: Miao Xie <miaox@cn.fujitsu.com>
Date: Thu, 1 Nov 2012 07:32:18 +0000 (+0000)
Subject: Btrfs: fix joining the same transaction handler more than 2 times
X-Git-Tag: v3.8-rc1~71^2~95
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b7d5b0a819498a9c04e1d18201a42468f7edd92a;p=pandora-kernel.git

Btrfs: fix joining the same transaction handler more than 2 times

If we flush inodes with pending delalloc in a transaction, we may join
the same transaction handler more than 2 times.

The reason is:
  Task						use_count of trans handle
  commit_transaction				1
    |-> btrfs_start_delalloc_inodes		1
	  |-> run_delalloc_nocow		1
		|-> join_transaction		2
		|-> cow_file_range		2
			|-> join_transaction	3

In fact, cow_file_range needn't join the transaction again because the caller
have joined the transaction, so we fix this problem by this way.

Reported-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
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