btrfs: move fs root init stuff into btrfs_init_fs_root
We have a helper for reading fs roots that just reads the fs root off the disk and then sets REF_COWS and init's the inheritable flags. Move this into btrfs_init_fs_root so we can later get rid of this helper and consolidate all of the fs root reading into one helper. Reviewed-by: NNikolay Borisov <nborisov@suse.com> Signed-off-by: NJosef Bacik <josef@toxicpanda.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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