Date:	Mon, 30 Sep 2013 18:28:31 -0700
From:	"Darrick J. Wong" <darrick.wong@...cle.com>
To:	tytso@....edu, darrick.wong@...cle.com
Cc:	linux-ext4@...r.kernel.org
Subject: [PATCH 17/31] libext2fs: Refactor u32-list to handle 32 and 64-bit
 data types

The curernt ext2_u32_list implementation manages a sorted sparse list of 32-bit
numbers.  This is currently used to collect directory inodes for rehashing in
e2fsck, and creating a list of bad blocks for mkfs.  However, block numbers are
now 64-bit, so we need to refactor the sparse list to be able to handle both 32
and 64-bit numbers.

Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
---
 lib/ext2fs/badblocks.c |  271 +++++++++++++++++++++++++++++++++++++-----------
 lib/ext2fs/ext2fs.h    |   23 +++-
 lib/ext2fs/ext2fsP.h   |   13 +-
 lib/ext2fs/inode.c     |   12 +-
 4 files changed, 237 insertions(+), 82 deletions(-)


diff --git a/lib/ext2fs/badblocks.c b/lib/ext2fs/badblocks.c
index 0f23983..4512243 100644
--- a/lib/ext2fs/badblocks.c
+++ b/lib/ext2fs/badblocks.c
@@ -27,42 +27,58 @@
 #include "ext2_fs.h"
 #include "ext2fsP.h"
 
+static void *LIST_ITEM(struct ext2_sparse_list *bb, unsigned int i)
+{
+	return bb->list + (i * bb->item_size);
+}
+
 /*
  * Helper function for making a badblocks list
  */
-static errcode_t make_u32_list(int size, int num, __u32 *list,
-			       ext2_u32_list *ret)
+static errcode_t sparse_list_make(unsigned int size, unsigned int num,
+				  unsigned int item_size,
+				  struct ext2_sparse_list *list,
+				  struct ext2_sparse_list **ret)
 {
-	ext2_u32_list	bb;
+	struct ext2_sparse_list *bb;
 	errcode_t	retval;
 
-	retval = ext2fs_get_mem(sizeof(struct ext2_struct_u32_list), &bb);
+	if (list && (list->magic != EXT2_ET_MAGIC_BADBLOCKS_LIST ||
+		     list->item_size != item_size)) {
+		return EXT2_ET_INVALID_ARGUMENT;
+	}
+
+	/* For now we only support 32 and 64bit unsigned */
+	if (item_size != sizeof(__u32) && item_size != sizeof(__u64))
+		return EXT2_ET_INVALID_ARGUMENT;
+
+	retval = ext2fs_get_mem(sizeof(struct ext2_sparse_list), &bb);
 	if (retval)
 		return retval;
-	memset(bb, 0, sizeof(struct ext2_struct_u32_list));
+	memset(bb, 0, sizeof(struct ext2_sparse_list));
 	bb->magic = EXT2_ET_MAGIC_BADBLOCKS_LIST;
 	bb->size = size ? size : 10;
 	bb->num = num;
-	retval = ext2fs_get_array(bb->size, sizeof(blk_t), &bb->list);
+	bb->item_size = item_size;
+	retval = ext2fs_get_array(bb->size, bb->item_size, &bb->list);
 	if (retval) {
 		ext2fs_free_mem(&bb);
 		return retval;
 	}
 	if (list)
-		memcpy(bb->list, list, bb->size * sizeof(blk_t));
+		memcpy(bb->list, list->list, bb->size * bb->item_size);
 	else
-		memset(bb->list, 0, bb->size * sizeof(blk_t));
+		memset(bb->list, 0, bb->size * bb->item_size);
 	*ret = bb;
 	return 0;
 }
 
-
 /*
  * This procedure creates an empty u32 list.
  */
 errcode_t ext2fs_u32_list_create(ext2_u32_list *ret, int size)
 {
-	return make_u32_list(size, 0, 0, ret);
+	return sparse_list_make(size, 0, sizeof(__u32), NULL, ret);
 }
 
 /*
@@ -70,28 +86,36 @@ errcode_t ext2fs_u32_list_create(ext2_u32_list *ret, int size)
  */
 errcode_t ext2fs_badblocks_list_create(ext2_badblocks_list *ret, int size)
 {
-	return make_u32_list(size, 0, 0, (ext2_badblocks_list *) ret);
+	return sparse_list_make(size, 0, sizeof(blk64_t), NULL,
+				(ext2_badblocks_list *) ret);
 }
 
 
 /*
  * This procedure copies a badblocks list
  */
-errcode_t ext2fs_u32_copy(ext2_u32_list src, ext2_u32_list *dest)
+static errcode_t sparse_list_copy(struct ext2_sparse_list *src,
+			   struct ext2_sparse_list **dest)
 {
 	errcode_t	retval;
 
-	retval = make_u32_list(src->size, src->num, src->list, dest);
+	retval = sparse_list_make(src->size, src->num, src->item_size, src,
+				  dest);
 	if (retval)
 		return retval;
 	(*dest)->badblocks_flags = src->badblocks_flags;
 	return 0;
 }
 
+errcode_t ext2fs_u32_copy(ext2_u32_list src, ext2_u32_list *dest)
+{
+	return sparse_list_copy(src, dest);
+}
+
 errcode_t ext2fs_badblocks_copy(ext2_badblocks_list src,
 				ext2_badblocks_list *dest)
 {
-	return ext2fs_u32_copy((ext2_u32_list) src,
+	return sparse_list_copy((ext2_u32_list) src,
 			       (ext2_u32_list *) dest);
 }
 
@@ -105,64 +129,107 @@ errcode_t ext2fs_badblocks_copy(ext2_badblocks_list src,
 /*
  * This procedure adds a block to a badblocks list.
  */
-errcode_t ext2fs_u32_list_add(ext2_u32_list bb, __u32 blk)
+static int compare32(const void *a, const void *b)
+{
+	__u32 i, j;
+	i = *(__u32 *)a;
+	j = *(__u32 *)b;
+
+	return i - j;
+}
+
+static int compare64(const void *a, const void *b)
+{
+	__u64 i, j;
+	i = *(__u64 *)a;
+	j = *(__u64 *)b;
+
+	return i - j;
+}
+
+static errcode_t sparse_list_add(struct ext2_sparse_list *bb, void *item)
 {
 	errcode_t	retval;
-	int		i, j;
+	int		i, j, k;
 	unsigned long	old_size;
+	int (*cmp)	(const void *a, const void *b);
 
 	EXT2_CHECK_MAGIC(bb, EXT2_ET_MAGIC_BADBLOCKS_LIST);
 
 	if (bb->num >= bb->size) {
-		old_size = bb->size * sizeof(__u32);
+		old_size = bb->size * bb->item_size;
 		bb->size += 100;
-		retval = ext2fs_resize_mem(old_size, bb->size * sizeof(__u32),
+		retval = ext2fs_resize_mem(old_size, bb->size * bb->item_size,
 					   &bb->list);
 		if (retval) {
 			bb->size -= 100;
 			return retval;
 		}
 	}
-
+	if (bb->item_size == sizeof(__u32))
+		cmp = compare32;
+	else if (bb->item_size == sizeof(__u64))
+		cmp = compare64;
+	else
+		return EXT2_ET_INVALID_ARGUMENT;
 	/*
 	 * Add special case code for appending to the end of the list
 	 */
 	i = bb->num-1;
-	if ((bb->num != 0) && (bb->list[i] == blk))
+	if ((bb->num != 0) && cmp(LIST_ITEM(bb, i), item) == 0)
 		return 0;
-	if ((bb->num == 0) || (bb->list[i] < blk)) {
-		bb->list[bb->num++] = blk;
+	if ((bb->num == 0) || cmp(LIST_ITEM(bb, i), item) < 0) {
+		memcpy(LIST_ITEM(bb, bb->num++), item, bb->item_size);
 		return 0;
 	}
 
 	j = bb->num;
 	for (i=0; i < bb->num; i++) {
-		if (bb->list[i] == blk)
+		k = cmp(LIST_ITEM(bb, i), item);
+		if (k == 0)
 			return 0;
-		if (bb->list[i] > blk) {
+		if (k > 0) {
 			j = i;
 			break;
 		}
 	}
-	for (i=bb->num; i > j; i--)
-		bb->list[i] = bb->list[i-1];
-	bb->list[j] = blk;
+	memmove(LIST_ITEM(bb, i + 1), LIST_ITEM(bb, i),
+		(bb->num - j) * bb->item_size);
+	memcpy(LIST_ITEM(bb, j), item, bb->item_size);
 	bb->num++;
 	return 0;
 }
 
+errcode_t ext2fs_u32_list_add(ext2_u32_list bb, __u32 blk)
+{
+	return sparse_list_add(bb, &blk);
+}
+
+errcode_t ext2fs_badblocks_list_add2(ext2_badblocks_list bb, blk64_t blk)
+{
+	return sparse_list_add(bb, &blk);
+}
+
 errcode_t ext2fs_badblocks_list_add(ext2_badblocks_list bb, blk_t blk)
 {
-	return ext2fs_u32_list_add((ext2_u32_list) bb, (__u32) blk);
+	return ext2fs_badblocks_list_add2(bb, blk);
 }
 
 /*
  * This procedure finds a particular block is on a badblocks
  * list.
  */
-int ext2fs_u32_list_find(ext2_u32_list bb, __u32 blk)
+static int sparse_list_find(struct ext2_sparse_list *bb, void *item)
 {
-	int	low, high, mid;
+	int	low, high, mid, k;
+	int (*cmp)	(const void *a, const void *b);
+
+	if (bb->item_size == sizeof(__u32))
+		cmp = compare32;
+	else if (bb->item_size == sizeof(__u64))
+		cmp = compare64;
+	else
+		return EXT2_ET_INVALID_ARGUMENT;
 
 	if (bb->magic != EXT2_ET_MAGIC_BADBLOCKS_LIST)
 		return -1;
@@ -172,18 +239,19 @@ int ext2fs_u32_list_find(ext2_u32_list bb, __u32 blk)
 
 	low = 0;
 	high = bb->num-1;
-	if (blk == bb->list[low])
+	if (cmp(LIST_ITEM(bb, low), item) == 0)
 		return low;
-	if (blk == bb->list[high])
+	if (cmp(LIST_ITEM(bb, high), item) == 0)
 		return high;
 
 	while (low < high) {
 		mid = ((unsigned)low + (unsigned)high)/2;
 		if (mid == low || mid == high)
 			break;
-		if (blk == bb->list[mid])
+		k = cmp(item, LIST_ITEM(bb, mid));
+		if (k == 0)
 			return mid;
-		if (blk < bb->list[mid])
+		if (k < 0)
 			high = mid;
 		else
 			low = mid;
@@ -191,13 +259,26 @@ int ext2fs_u32_list_find(ext2_u32_list bb, __u32 blk)
 	return -1;
 }
 
+int ext2fs_u32_list_find(ext2_u32_list bb, __u32 blk)
+{
+	return sparse_list_find(bb, &blk);
+}
+
 /*
  * This procedure tests to see if a particular block is on a badblocks
  * list.
  */
 int ext2fs_u32_list_test(ext2_u32_list bb, __u32 blk)
 {
-	if (ext2fs_u32_list_find(bb, blk) < 0)
+	if (sparse_list_find(bb, &blk) < 0)
+		return 0;
+	else
+		return 1;
+}
+
+int ext2fs_badblocks_list_test2(ext2_badblocks_list bb, blk64_t blk)
+{
+	if (sparse_list_find(bb, &blk) < 0)
 		return 0;
 	else
 		return 1;
@@ -205,65 +286,83 @@ int ext2fs_u32_list_test(ext2_u32_list bb, __u32 blk)
 
 int ext2fs_badblocks_list_test(ext2_badblocks_list bb, blk_t blk)
 {
-	return ext2fs_u32_list_test((ext2_u32_list) bb, (__u32) blk);
+	return ext2fs_badblocks_list_test2(bb, blk);
 }
 
 
 /*
  * Remove a block from the badblock list
  */
-int ext2fs_u32_list_del(ext2_u32_list bb, __u32 blk)
+static int sparse_list_del(struct ext2_sparse_list *bb, void *item)
 {
-	int	remloc, i;
+	int	remloc;
 
 	if (bb->num == 0)
 		return -1;
 
-	remloc = ext2fs_u32_list_find(bb, blk);
+	remloc = sparse_list_find(bb, item);
 	if (remloc < 0)
 		return -1;
 
-	for (i = remloc ; i < bb->num-1; i++)
-		bb->list[i] = bb->list[i+1];
+	memmove(LIST_ITEM(bb, remloc), LIST_ITEM(bb, remloc + 1),
+		(bb->num - remloc - 1) * bb->item_size);
 	bb->num--;
 	return 0;
 }
 
+int ext2fs_u32_list_del(ext2_u32_list bb, __u32 blk)
+{
+	return sparse_list_del(bb, &blk);
+}
+
+void ext2fs_badblocks_list_del2(ext2_u32_list bb, blk64_t blk)
+{
+	sparse_list_del(bb, &blk);
+}
+
 void ext2fs_badblocks_list_del(ext2_u32_list bb, __u32 blk)
 {
-	ext2fs_u32_list_del(bb, blk);
+	ext2fs_badblocks_list_del(bb, blk);
 }
 
-errcode_t ext2fs_u32_list_iterate_begin(ext2_u32_list bb,
-					ext2_u32_iterate *ret)
+static errcode_t sparse_list_iterate_begin(struct ext2_sparse_list *bb,
+					   struct ext2_sparse_list_iterate **r)
 {
-	ext2_u32_iterate iter;
+	struct ext2_sparse_list_iterate *iter;
 	errcode_t		retval;
 
 	EXT2_CHECK_MAGIC(bb, EXT2_ET_MAGIC_BADBLOCKS_LIST);
 
-	retval = ext2fs_get_mem(sizeof(struct ext2_struct_u32_iterate), &iter);
+	retval = ext2fs_get_mem(sizeof(struct ext2_sparse_list_iterate),
+				&iter);
 	if (retval)
 		return retval;
 
 	iter->magic = EXT2_ET_MAGIC_BADBLOCKS_ITERATE;
 	iter->bb = bb;
 	iter->ptr = 0;
-	*ret = iter;
+	*r = iter;
 	return 0;
 }
 
+errcode_t ext2fs_u32_list_iterate_begin(ext2_u32_list bb,
+					ext2_u32_iterate *ret)
+{
+	return sparse_list_iterate_begin(bb, ret);
+}
+
 errcode_t ext2fs_badblocks_list_iterate_begin(ext2_badblocks_list bb,
 					      ext2_badblocks_iterate *ret)
 {
-	return ext2fs_u32_list_iterate_begin((ext2_u32_list) bb,
-					      (ext2_u32_iterate *) ret);
+	return sparse_list_iterate_begin((ext2_u32_list) bb,
+					 (ext2_u32_iterate *) ret);
 }
 
 
-int ext2fs_u32_list_iterate(ext2_u32_iterate iter, __u32 *blk)
+static int sparse_list_iterate(struct ext2_sparse_list_iterate *iter,
+			       void *item)
 {
-	ext2_u32_list	bb;
+	struct ext2_sparse_list	*bb;
 
 	if (iter->magic != EXT2_ET_MAGIC_BADBLOCKS_ITERATE)
 		return 0;
@@ -274,21 +373,35 @@ int ext2fs_u32_list_iterate(ext2_u32_iterate iter, __u32 *blk)
 		return 0;
 
 	if (iter->ptr < bb->num) {
-		*blk = bb->list[iter->ptr++];
+		memcpy(item, LIST_ITEM(bb, iter->ptr++), bb->item_size);
 		return 1;
 	}
-	*blk = 0;
+	memset(item, 0, bb->item_size);
 	return 0;
 }
 
+int ext2fs_u32_list_iterate(ext2_u32_iterate iter, __u32 *blk)
+{
+	return sparse_list_iterate(iter, blk);
+}
+
+int ext2fs_badblocks_list_iterate2(ext2_badblocks_iterate iter, blk64_t *blk)
+{
+	return sparse_list_iterate(iter, blk);
+}
+
 int ext2fs_badblocks_list_iterate(ext2_badblocks_iterate iter, blk_t *blk)
 {
-	return ext2fs_u32_list_iterate((ext2_u32_iterate) iter,
-				       (__u32 *) blk);
+	blk64_t x;
+	int ret;
+
+	ret = ext2fs_badblocks_list_iterate2(iter, &x);
+	*blk = x;
+	return ret;
 }
 
 
-void ext2fs_u32_list_iterate_end(ext2_u32_iterate iter)
+static void sparse_list_iterate_end(struct ext2_sparse_list_iterate *iter)
 {
 	if (!iter || (iter->magic != EXT2_ET_MAGIC_BADBLOCKS_ITERATE))
 		return;
@@ -297,13 +410,19 @@ void ext2fs_u32_list_iterate_end(ext2_u32_iterate iter)
 	ext2fs_free_mem(&iter);
 }
 
+void ext2fs_u32_list_iterate_end(ext2_u32_iterate iter)
+{
+	sparse_list_iterate_end(iter);
+}
+
 void ext2fs_badblocks_list_iterate_end(ext2_badblocks_iterate iter)
 {
-	ext2fs_u32_list_iterate_end((ext2_u32_iterate) iter);
+	sparse_list_iterate_end(iter);
 }
 
 
-int ext2fs_u32_list_equal(ext2_u32_list bb1, ext2_u32_list bb2)
+static int sparse_list_equal(struct ext2_sparse_list *bb1,
+			     struct ext2_sparse_list *bb2)
 {
 	EXT2_CHECK_MAGIC(bb1, EXT2_ET_MAGIC_BADBLOCKS_LIST);
 	EXT2_CHECK_MAGIC(bb2, EXT2_ET_MAGIC_BADBLOCKS_LIST);
@@ -311,18 +430,46 @@ int ext2fs_u32_list_equal(ext2_u32_list bb1, ext2_u32_list bb2)
 	if (bb1->num != bb2->num)
 		return 0;
 
-	if (memcmp(bb1->list, bb2->list, bb1->num * sizeof(blk_t)) != 0)
+	if (bb1->item_size != bb2->item_size)
+		return 0;
+
+	if (memcmp(bb1->list, bb2->list, bb1->num * bb1->item_size) != 0)
 		return 0;
 	return 1;
 }
 
+int ext2fs_u32_list_equal(ext2_u32_list bb1, ext2_u32_list bb2)
+{
+	return sparse_list_equal(bb1, bb2);
+}
+
 int ext2fs_badblocks_equal(ext2_badblocks_list bb1, ext2_badblocks_list bb2)
 {
-	return ext2fs_u32_list_equal((ext2_u32_list) bb1,
-				     (ext2_u32_list) bb2);
+	return sparse_list_equal(bb1, bb2);
 }
 
-int ext2fs_u32_list_count(ext2_u32_list bb)
+static unsigned int sparse_list_count(struct ext2_sparse_list *bb)
 {
+	EXT2_CHECK_MAGIC(bb, EXT2_ET_MAGIC_BADBLOCKS_LIST);
 	return bb->num;
 }
+
+int ext2fs_u32_list_count(ext2_u32_list bb)
+{
+	return sparse_list_count(bb);
+}
+
+unsigned int ext2fs_badblocks_count(ext2_badblocks_list bb)
+{
+	return sparse_list_count(bb);
+}
+
+blk64_t ext2fs_badblocks_get(ext2_badblocks_list bb, unsigned int i)
+{
+	blk64_t x;
+
+	if (i < 0 || i >= bb->num)
+		return 0;
+	memcpy(&x, LIST_ITEM(bb, i), bb->item_size);
+	return x;
+}
diff --git a/lib/ext2fs/ext2fs.h b/lib/ext2fs/ext2fs.h
index d5d8d03..b4ba421 100644
--- a/lib/ext2fs/ext2fs.h
+++ b/lib/ext2fs/ext2fs.h
@@ -111,15 +111,15 @@ typedef struct ext2fs_struct_generic_bitmap *ext2fs_block_bitmap;
  * Badblocks list definitions
  */
 
-typedef struct ext2_struct_u32_list *ext2_badblocks_list;
-typedef struct ext2_struct_u32_iterate *ext2_badblocks_iterate;
+typedef struct ext2_sparse_list *ext2_badblocks_list;
+typedef struct ext2_sparse_list_iterate *ext2_badblocks_iterate;
 
-typedef struct ext2_struct_u32_list *ext2_u32_list;
-typedef struct ext2_struct_u32_iterate *ext2_u32_iterate;
+typedef struct ext2_sparse_list *ext2_u32_list;
+typedef struct ext2_sparse_list_iterate *ext2_u32_iterate;
 
 /* old */
-typedef struct ext2_struct_u32_list *badblocks_list;
-typedef struct ext2_struct_u32_iterate *badblocks_iterate;
+typedef struct ext2_sparse_list *badblocks_list;
+typedef struct ext2_sparse_list_iterate *badblocks_iterate;
 
 #define BADBLOCKS_FLAG_DIRTY	1
 
@@ -702,6 +702,8 @@ extern int ext2fs_u32_list_iterate(ext2_u32_iterate iter, blk_t *blk);
 extern void ext2fs_u32_list_iterate_end(ext2_u32_iterate iter);
 extern errcode_t ext2fs_u32_copy(ext2_u32_list src, ext2_u32_list *dest);
 extern int ext2fs_u32_list_equal(ext2_u32_list bb1, ext2_u32_list bb2);
+extern int ext2fs_u32_list_del(ext2_u32_list bb, __u32 blk);
+extern int ext2fs_u32_list_count(ext2_u32_list bb);
 
 extern errcode_t ext2fs_badblocks_list_create(ext2_badblocks_list *ret,
 					    int size);
@@ -709,7 +711,6 @@ extern errcode_t ext2fs_badblocks_list_add(ext2_badblocks_list bb,
 					   blk_t blk);
 extern int ext2fs_badblocks_list_test(ext2_badblocks_list bb,
 				    blk_t blk);
-extern int ext2fs_u32_list_del(ext2_u32_list bb, __u32 blk);
 extern void ext2fs_badblocks_list_del(ext2_u32_list bb, __u32 blk);
 extern errcode_t
 	ext2fs_badblocks_list_iterate_begin(ext2_badblocks_list bb,
@@ -721,7 +722,13 @@ extern errcode_t ext2fs_badblocks_copy(ext2_badblocks_list src,
 				       ext2_badblocks_list *dest);
 extern int ext2fs_badblocks_equal(ext2_badblocks_list bb1,
 				  ext2_badblocks_list bb2);
-extern int ext2fs_u32_list_count(ext2_u32_list bb);
+extern errcode_t ext2fs_badblocks_list_add2(ext2_badblocks_list bb,
+					    blk64_t blk);
+extern int ext2fs_badblocks_list_test2(ext2_badblocks_list bb, blk64_t blk);
+extern void ext2fs_badblocks_list_del2(ext2_u32_list bb, blk64_t blk);
+extern int ext2fs_badblocks_list_iterate2(ext2_badblocks_iterate iter,
+					  blk64_t *blk);
+extern blk64_t ext2fs_badblocks_get(ext2_badblocks_list bb, unsigned int i);
 
 /* bb_compat */
 extern errcode_t badblocks_list_create(badblocks_list *ret, int size);
diff --git a/lib/ext2fs/ext2fsP.h b/lib/ext2fs/ext2fsP.h
index 80d2d0a..592527c 100644
--- a/lib/ext2fs/ext2fsP.h
+++ b/lib/ext2fs/ext2fsP.h
@@ -16,17 +16,18 @@
 /*
  * Badblocks list
  */
-struct ext2_struct_u32_list {
+struct ext2_sparse_list {
 	int	magic;
-	int	num;
-	int	size;
-	__u32	*list;
+	unsigned int	num;
+	unsigned int	size;
+	unsigned int	item_size;
+	void	*list;
 	int	badblocks_flags;
 };
 
-struct ext2_struct_u32_iterate {
+struct ext2_sparse_list_iterate {
 	int			magic;
-	ext2_u32_list		bb;
+	struct ext2_sparse_list	*bb;
 	int			ptr;
 };
 
diff --git a/lib/ext2fs/inode.c b/lib/ext2fs/inode.c
index 46c1c58..6579512 100644
--- a/lib/ext2fs/inode.c
+++ b/lib/ext2fs/inode.c
@@ -313,8 +313,8 @@ static errcode_t check_for_inode_bad_blocks(ext2_inode_scan scan,
 	 * is no longer the case.  If we run out of bad blocks, then
 	 * we don't need to do any more checking!
 	 */
-	while (blk > bb->list[scan->bad_block_ptr]) {
-		if (++scan->bad_block_ptr >= bb->num) {
+	while (blk > ext2fs_badblocks_get(bb, scan->bad_block_ptr)) {
+		if (++scan->bad_block_ptr >= ext2fs_badblocks_count(bb)) {
 			scan->scan_flags &= ~EXT2_SF_CHK_BADBLOCKS;
 			return 0;
 		}
@@ -328,10 +328,10 @@ static errcode_t check_for_inode_bad_blocks(ext2_inode_scan scan,
 	 * expense of a huge expense of code complexity, and for an
 	 * uncommon case at that.)
 	 */
-	if (blk == bb->list[scan->bad_block_ptr]) {
+	if (blk == ext2fs_badblocks_get(bb, scan->bad_block_ptr)) {
 		scan->scan_flags |= EXT2_SF_BAD_INODE_BLK;
 		*num_blocks = 1;
-		if (++scan->bad_block_ptr >= bb->num)
+		if (++scan->bad_block_ptr >= ext2fs_badblocks_count(bb))
 			scan->scan_flags &= ~EXT2_SF_CHK_BADBLOCKS;
 		return 0;
 	}
@@ -342,8 +342,8 @@ static errcode_t check_for_inode_bad_blocks(ext2_inode_scan scan,
 	 * don't read in the bad block.  (Then the next block to read
 	 * will be the bad block, which is handled in the above case.)
 	 */
-	if ((blk + *num_blocks) > bb->list[scan->bad_block_ptr])
-		*num_blocks = (int) (bb->list[scan->bad_block_ptr] - blk);
+	if ((blk + *num_blocks) > ext2fs_badblocks_get(bb, scan->bad_block_ptr))
+		*num_blocks = (int)(ext2fs_badblocks_get(bb, scan->bad_block_ptr) - blk);
 
 	return 0;
 }

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