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-rw-r--r--e2fslib/badblocks.c236
1 files changed, 236 insertions, 0 deletions
diff --git a/e2fslib/badblocks.c b/e2fslib/badblocks.c
new file mode 100644
index 0000000..4e94e8c
--- /dev/null
+++ b/e2fslib/badblocks.c
@@ -0,0 +1,236 @@
+/*
+ * badblocks.c --- routines to manipulate the bad block structure
+ *
+ * Copyright (C) 1994, 1995, 1996 Theodore Ts'o.
+ *
+ * %Begin-Header%
+ * This file may be redistributed under the terms of the GNU Public
+ * License.
+ * %End-Header%
+ */
+
+#include <stdio.h>
+#include <string.h>
+#if HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#include <fcntl.h>
+#include <time.h>
+#if HAVE_SYS_STAT_H
+#include <sys/stat.h>
+#endif
+#if HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+
+#include "ext2_fs.h"
+#include "ext2fsP.h"
+
+/*
+ * Helper function for making a badblocks list
+ */
+static errcode_t make_badblocks_list(int size, int num, blk_t *list,
+ ext2_badblocks_list *ret)
+{
+ ext2_badblocks_list bb;
+ errcode_t retval;
+
+ retval = ext2fs_get_mem(sizeof(struct ext2_struct_badblocks_list),
+ (void **) &bb);
+ if (retval)
+ return retval;
+ memset(bb, 0, sizeof(struct ext2_struct_badblocks_list));
+ bb->magic = EXT2_ET_MAGIC_BADBLOCKS_LIST;
+ bb->size = size ? size : 10;
+ bb->num = num;
+ retval = ext2fs_get_mem(bb->size * sizeof(blk_t), (void **) &bb->list);
+ if (!bb->list) {
+ ext2fs_free_mem((void **) &bb);
+ return retval;
+ }
+ if (list)
+ memcpy(bb->list, list, bb->size * sizeof(blk_t));
+ else
+ memset(bb->list, 0, bb->size * sizeof(blk_t));
+ *ret = bb;
+ return 0;
+}
+
+
+/*
+ * This procedure creates an empty badblocks list.
+ */
+errcode_t ext2fs_badblocks_list_create(ext2_badblocks_list *ret, int size)
+{
+ return make_badblocks_list(size, 0, 0, ret);
+}
+
+/*
+ * This procedure copies a badblocks list
+ */
+errcode_t ext2fs_badblocks_copy(ext2_badblocks_list src,
+ ext2_badblocks_list *dest)
+{
+ errcode_t retval;
+
+ retval = make_badblocks_list(src->size, src->num, src->list,
+ dest);
+ if (retval)
+ return retval;
+ (*dest)->badblocks_flags = src->badblocks_flags;
+ return 0;
+}
+
+
+/*
+ * This procedure frees a badblocks list.
+ *
+ * (note: moved to closefs.c)
+ */
+
+
+/*
+ * This procedure adds a block to a badblocks list.
+ */
+errcode_t ext2fs_badblocks_list_add(ext2_badblocks_list bb, blk_t blk)
+{
+ errcode_t retval;
+ int i, j;
+ unsigned long old_size;
+
+ EXT2_CHECK_MAGIC(bb, EXT2_ET_MAGIC_BADBLOCKS_LIST);
+
+ if (bb->num >= bb->size) {
+ old_size = bb->size * sizeof(blk_t);
+ bb->size += 100;
+ retval = ext2fs_resize_mem(old_size, bb->size * sizeof(blk_t),
+ (void **) &bb->list);
+ if (retval) {
+ bb->size -= 100;
+ return retval;
+ }
+ }
+
+ /*
+ * Add special case code for appending to the end of the list
+ */
+ i = bb->num-1;
+ if ((bb->num != 0) && (bb->list[i] == blk))
+ return 0;
+ if ((bb->num == 0) || (bb->list[i] < blk)) {
+ bb->list[bb->num++] = blk;
+ return 0;
+ }
+
+ j = bb->num;
+ for (i=0; i < bb->num; i++) {
+ if (bb->list[i] == blk)
+ return 0;
+ if (bb->list[i] > blk) {
+ j = i;
+ break;
+ }
+ }
+ for (i=bb->num; i > j; i--)
+ bb->list[i] = bb->list[i-1];
+ bb->list[j] = blk;
+ bb->num++;
+ return 0;
+}
+
+/*
+ * This procedure tests to see if a particular block is on a badblocks
+ * list.
+ */
+int ext2fs_badblocks_list_test(ext2_badblocks_list bb, blk_t blk)
+{
+ int low, high, mid;
+
+ if (bb->magic != EXT2_ET_MAGIC_BADBLOCKS_LIST)
+ return 0;
+
+ if (bb->num == 0)
+ return 0;
+
+ low = 0;
+ high = bb->num-1;
+ if (blk == bb->list[low])
+ return 1;
+ if (blk == bb->list[high])
+ return 1;
+
+ while (low < high) {
+ mid = (low+high)/2;
+ if (mid == low || mid == high)
+ break;
+ if (blk == bb->list[mid])
+ return 1;
+ if (blk < bb->list[mid])
+ high = mid;
+ else
+ low = mid;
+ }
+ return 0;
+}
+
+errcode_t ext2fs_badblocks_list_iterate_begin(ext2_badblocks_list bb,
+ ext2_badblocks_iterate *ret)
+{
+ ext2_badblocks_iterate iter;
+ errcode_t retval;
+
+ EXT2_CHECK_MAGIC(bb, EXT2_ET_MAGIC_BADBLOCKS_LIST);
+
+ retval = ext2fs_get_mem(sizeof(struct ext2_struct_badblocks_iterate),
+ (void **) &iter);
+ if (retval)
+ return retval;
+
+ iter->magic = EXT2_ET_MAGIC_BADBLOCKS_ITERATE;
+ iter->bb = bb;
+ iter->ptr = 0;
+ *ret = iter;
+ return 0;
+}
+
+int ext2fs_badblocks_list_iterate(ext2_badblocks_iterate iter, blk_t *blk)
+{
+ ext2_badblocks_list bb;
+
+ if (iter->magic != EXT2_ET_MAGIC_BADBLOCKS_ITERATE)
+ return 0;
+
+ bb = iter->bb;
+
+ if (bb->magic != EXT2_ET_MAGIC_BADBLOCKS_LIST)
+ return 0;
+
+ if (iter->ptr < bb->num) {
+ *blk = bb->list[iter->ptr++];
+ return 1;
+ }
+ *blk = 0;
+ return 0;
+}
+
+void ext2fs_badblocks_list_iterate_end(ext2_badblocks_iterate iter)
+{
+ if (!iter || (iter->magic != EXT2_ET_MAGIC_BADBLOCKS_ITERATE))
+ return;
+
+ iter->bb = 0;
+ ext2fs_free_mem((void **) &iter);
+}
+
+int ext2fs_badblocks_equal(ext2_badblocks_list bb1, ext2_badblocks_list bb2)
+{
+ EXT2_CHECK_MAGIC(bb1, EXT2_ET_MAGIC_BADBLOCKS_LIST);
+ EXT2_CHECK_MAGIC(bb2, EXT2_ET_MAGIC_BADBLOCKS_LIST);
+
+ if (bb1->num != bb2->num)
+ return 0;
+
+ if (memcmp(bb1->list, bb2->list, bb1->num * sizeof(blk_t)) != 0)
+ return 0;
+ return 1;
+}