btrfs: add helper for bit enumeration

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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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This commit is contained in:

David Sterba 2022-09-09 17:20:25 +02:00

parent 5565b8e0ad

commit d549ff7bdb

1 changed files with 8 additions and 0 deletions

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fs/btrfs/misc.h

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