From 49ada7a2c3f664aa2c3e17e2adf4abaf2a04d17d Mon Sep 17 00:00:00 2001
From: Alasdair Kergon <agk@redhat.com>
Date: Tue, 20 Apr 2010 13:58:22 +0000
Subject: [PATCH] Add dm_bitset_equal to libdevmapper.

---
 WHATS_NEW_DM              |  2 +-
 libdm/.exported_symbols   |  1 +
 libdm/datastruct/bitset.c | 11 +++++++++++
 libdm/libdevmapper.h      |  2 ++
 4 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/WHATS_NEW_DM b/WHATS_NEW_DM
index 657847728..60725a8a4 100644
--- a/WHATS_NEW_DM
+++ b/WHATS_NEW_DM
@@ -1,6 +1,6 @@
 Version 1.02.47 -
 =================================
-  Add dm_bit_and.
+  Add dm_bit_and and dm_bitset_equal to libdevmapper.
   Simplify dm_bitset_create.
   Speed up dm_bit_get_next with ffs().
 
diff --git a/libdm/.exported_symbols b/libdm/.exported_symbols
index 67962aeea..73ee5bd7d 100644
--- a/libdm/.exported_symbols
+++ b/libdm/.exported_symbols
@@ -109,6 +109,7 @@ dm_pool_strndup
 dm_pool_zalloc
 dm_bitset_create
 dm_bitset_destroy
+dm_bitset_equal
 dm_bit_and
 dm_bit_union
 dm_bit_get_first
diff --git a/libdm/datastruct/bitset.c b/libdm/datastruct/bitset.c
index 6dd5952a6..9b8aff933 100644
--- a/libdm/datastruct/bitset.c
+++ b/libdm/datastruct/bitset.c
@@ -42,6 +42,17 @@ void dm_bitset_destroy(dm_bitset_t bs)
 	dm_free(bs);
 }
 
+int dm_bitset_equal(dm_bitset_t in1, dm_bitset_t in2)
+{
+	int i;
+
+	for (i = (in1[0] / DM_BITS_PER_INT) + 1; i; i--)
+		if (in1[i] != in2[i])
+			return 0;
+
+	return 1;
+}
+
 void dm_bit_and(dm_bitset_t out, dm_bitset_t in1, dm_bitset_t in2)
 {
 	int i;
diff --git a/libdm/libdevmapper.h b/libdm/libdevmapper.h
index 243577421..0ee23fbb5 100644
--- a/libdm/libdevmapper.h
+++ b/libdm/libdevmapper.h
@@ -600,6 +600,8 @@ typedef uint32_t *dm_bitset_t;
 dm_bitset_t dm_bitset_create(struct dm_pool *mem, unsigned num_bits);
 void dm_bitset_destroy(dm_bitset_t bs);
 
+int dm_bitset_equal(dm_bitset_t in1, dm_bitset_t in2);
+
 void dm_bit_and(dm_bitset_t out, dm_bitset_t in1, dm_bitset_t in2);
 void dm_bit_union(dm_bitset_t out, dm_bitset_t in1, dm_bitset_t in2);
 int dm_bit_get_first(dm_bitset_t bs);