Btrfs: add __get_block_group_index() helper
authorIlya Dryomov <idryomov@gmail.com>
Tue, 27 Mar 2012 14:09:17 +0000 (17:09 +0300)
committerIlya Dryomov <idryomov@gmail.com>
Tue, 27 Mar 2012 14:09:17 +0000 (17:09 +0300)
Add __get_block_group_index() helper to be able to derive block group
index from an arbitary set of flags.  Implement get_block_group_index()
in terms of it.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

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