From: Zhao Lei <zhaolei@cn.fujitsu.com>
Date: Tue, 20 Jan 2015 07:11:34 +0000 (+0800)
Subject: Btrfs: add ref_count and free function for btrfs_bio
X-Git-Tag: fixes-v4.0-rc1~50^2~37
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6e9606d2a2dce098c1739fb3cd82a1c34fd73d3a;p=pandora-kernel.git

Btrfs: add ref_count and free function for btrfs_bio

1: ref_count is simple than current RBIO_HOLD_BBIO_MAP_BIT flag
   to keep btrfs_bio's memory in raid56 recovery implement.
2: free function for bbio will make code clean and flexible, plus
   forced data type checking in compile.

Changelog v1->v2:
 Rename following by David Sterba's suggestion:
 put_btrfs_bio() -> btrfs_put_bio()
 get_btrfs_bio() -> btrfs_get_bio()
 bbio->ref_count -> bbio->refs

Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
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