From 7f4191a202ea4558ca2d5eb8a47daea33c9999c7 Mon Sep 17 00:00:00 2001
From: Kent Overstreet <kent.overstreet@gmail.com>
Date: Sun, 11 Dec 2016 14:45:48 -0900
Subject: add support for maximum journal entry size

also rip out prototype crypto support code - real code is in the dev
branch, with the new superblock format
---
 util.c | 27 ++++++++++++++-------------
 1 file changed, 14 insertions(+), 13 deletions(-)

(limited to 'util.c')

diff --git a/util.c b/util.c
index 73d35f7..1bab7da 100644
--- a/util.c
+++ b/util.c
@@ -1,4 +1,5 @@
 #include <alloca.h>
+#include <assert.h>
 #include <ctype.h>
 #include <errno.h>
 #include <fcntl.h>
@@ -21,23 +22,13 @@
 
 /* Integer stuff: */
 
-u64 rounddown_pow_of_two(u64 n)
-{
-	u64 ret;
-
-	do {
-		ret = n;
-		n &= n - 1;
-	} while (n);
-
-	return ret;
-}
-
 unsigned ilog2(u64 n)
 {
 	unsigned ret = 0;
 
-	while (n) {
+	assert(n > 0);
+
+	while (n > 1) {
 		ret++;
 		n >>= 1;
 	}
@@ -45,6 +36,16 @@ unsigned ilog2(u64 n)
 	return ret;
 }
 
+u64 rounddown_pow_of_two(u64 n)
+{
+	return 1ULL << ilog2(n);
+}
+
+u64 roundup_pow_of_two(u64 n)
+{
+	return 1ULL << (ilog2(n - 1) + 1);
+}
+
 char *skip_spaces(const char *str)
 {
 	while (isspace(*str))
-- 
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