btrfs: factor out root promotion logic into promote_child_to_root()

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The balance_level() function is overly long and contains a cold code path
that handles promoting a child node to root when the root has only one item.
This code has distinct logic that is clearer and more maintainable when
isolated in its own function.

Signed-off-by: Sun YangKai <sunk67188@gmail.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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Sun YangKai 2025-11-14 15:24:45 +08:00 • committed by David Sterba

parent 1a332a6d70

commit 31b37b7667

1 changed files with 70 additions and 46 deletions

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fs/btrfs/ctree.c

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