From: Li Zefan <lizf@cn.fujitsu.com>
Date: Tue, 29 Mar 2011 05:46:06 +0000 (+0800)
Subject: Btrfs: Make free space cache code generic
X-Git-Tag: v3.0-rc1~38^2~12^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=34d52cb6c50b5a43901709998f59fb1c5a43dc4a;p=pandora-kernel.git

Btrfs: Make free space cache code generic

So we can re-use the code to cache free inode numbers.

The change is quite straightforward. Two new structures are introduced.

- struct btrfs_free_space_ctl

  We move those variables that are used for caching free space from
  struct btrfs_block_group_cache to this new struct.

- struct btrfs_free_space_op

  We do block group specific work (e.g. calculation of extents threshold)
  through functions registered in this struct.

And then we can remove references to struct btrfs_block_group_cache.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
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