[PATCH v3 3/3] reftable/stack: make segment end inclusive

["Justin Tobler via GitGitGadget" <gitgitgadget@gmail.com>]

From: Justin Tobler <jltobler@gmail.com>

For a reftable segment, the start of the range is inclusive and the end
is exclusive. In practice we increment the end when creating the
compaction segment only to decrement the segment end when using it.

Simplify by making the segment end inclusive. The corresponding test,
`test_suggest_compaction_segment()`, is updated to show that the segment
end is now inclusive.

Signed-off-by: Justin Tobler <jltobler@gmail.com>
---
 reftable/stack.c      | 4 ++--
 reftable/stack_test.c | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/reftable/stack.c b/reftable/stack.c
index e7b9a1de5a4..0973c47dd92 100644
--- a/reftable/stack.c
+++ b/reftable/stack.c
@@ -1237,7 +1237,7 @@ struct segment suggest_compaction_segment(uint64_t *sizes, size_t n)
 	 */
 	for (i = n - 1; i > 0; i--) {
 		if (sizes[i - 1] < sizes[i] * 2) {
-			seg.end = i + 1;
+			seg.end = i;
 			bytes = sizes[i];
 			break;
 		}
@@ -1291,7 +1291,7 @@ int reftable_stack_auto_compact(struct reftable_stack *st)
 		suggest_compaction_segment(sizes, st->merged->stack_len);
 	reftable_free(sizes);
 	if (segment_size(&seg) > 0)
-		return stack_compact_range_stats(st, seg.start, seg.end - 1,
+		return stack_compact_range_stats(st, seg.start, seg.end,
 						 NULL);
 
 	return 0;
diff --git a/reftable/stack_test.c b/reftable/stack_test.c
index 21541742fe5..4d7305623a0 100644
--- a/reftable/stack_test.c
+++ b/reftable/stack_test.c
@@ -723,7 +723,7 @@ static void test_suggest_compaction_segment(void)
 	struct segment min =
 		suggest_compaction_segment(sizes, ARRAY_SIZE(sizes));
 	EXPECT(min.start == 1);
-	EXPECT(min.end == 10);
+	EXPECT(min.end == 9);
 }
 
 static void test_suggest_compaction_segment_nothing(void)
-- 
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