btrfs: introduce helpers for updating eb uuids
The fsid and chunk tree uuid are always located in the first page,
we don't need the to use write_extent_buffer.
Signed-off-by: NDavid Sterba <dsterba@suse.com>
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The fsid and chunk tree uuid are always located in the first page,
we don't need the to use write_extent_buffer.
Signed-off-by: NDavid Sterba <dsterba@suse.com>