btrfs: add helper for bit enumeration
Define helper macro that can be used in enum {} to utilize the automatic increment to define all bits without directly defining the values or using additional linear bits. 1. capture the sequence value, N 2. use the value to define the given enum with N-th bit set 3. reset the sequence back to N Use for enums that do not require fixed values for symbolic names (like for on-disk structures): enum { ENUM_BIT(FIRST), ENUM_BIT(SECOND), ENUM_BIT(THIRD) }; Where the values would be 0x1, 0x2 and 0x4. Reviewed-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: David Sterba <dsterba@suse.com>
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