Add an eytzinger0_for_each_prev() macro for iterating through an eytzinger array in reverse.
Signed-off-by: Andreas Gruenbacher <[email protected]> --- fs/bcachefs/eytzinger.h | 5 +++++ fs/bcachefs/util.c | 9 +++++++++ 2 files changed, 14 insertions(+) diff --git a/fs/bcachefs/eytzinger.h b/fs/bcachefs/eytzinger.h index 6fa6d51a5420..f25c895aa184 100644 --- a/fs/bcachefs/eytzinger.h +++ b/fs/bcachefs/eytzinger.h @@ -246,6 +246,11 @@ static inline unsigned inorder_to_eytzinger0(unsigned i, unsigned size) (_i) != -1; \ (_i) = eytzinger0_next((_i), (_size))) +#define eytzinger0_for_each_prev(_i, _size) \ + for (unsigned (_i) = eytzinger0_last((_size)); \ + (_i) != -1; \ + (_i) = eytzinger0_prev((_i), (_size))) + /* return greatest node <= @search, or -1 if not found */ static inline int eytzinger0_find_le(void *base, size_t nr, size_t size, cmp_func_t cmp, const void *search) diff --git a/fs/bcachefs/util.c b/fs/bcachefs/util.c index 87502e1ac7ce..3fe9a3b8c696 100644 --- a/fs/bcachefs/util.c +++ b/fs/bcachefs/util.c @@ -763,6 +763,15 @@ void eytzinger0_test(void) inorder++; } BUG_ON(inorder != size); + + inorder = size - 1; + eytzinger0_for_each_prev(eytz, size) { + BUG_ON(eytz != eytzinger0_first(size) && + eytzinger0_next(eytzinger0_prev(eytz, size), size) != eytz); + + inorder--; + } + BUG_ON(inorder != -1); } } -- 2.48.1
