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Diffstat (limited to 'e2fsprogs/ext2fs/alloc_sb.c')
-rw-r--r--e2fsprogs/ext2fs/alloc_sb.c57
1 files changed, 57 insertions, 0 deletions
diff --git a/e2fsprogs/ext2fs/alloc_sb.c b/e2fsprogs/ext2fs/alloc_sb.c
new file mode 100644
index 000000000..ef40b938f
--- /dev/null
+++ b/e2fsprogs/ext2fs/alloc_sb.c
@@ -0,0 +1,57 @@
+/*
+ * alloc_sb.c --- Allocate the superblock and block group descriptors for a
+ * newly initialized filesystem. Used by mke2fs when initializing a filesystem
+ *
+ * Copyright (C) 1994, 1995, 1996, 2003 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 "ext2fs.h"
+
+int ext2fs_reserve_super_and_bgd(ext2_filsys fs,
+ dgrp_t group,
+ ext2fs_block_bitmap bmap)
+{
+ blk_t super_blk, old_desc_blk, new_desc_blk;
+ int j, old_desc_blocks, num_blocks;
+
+ num_blocks = ext2fs_super_and_bgd_loc(fs, group, &super_blk,
+ &old_desc_blk, &new_desc_blk, 0);
+
+ if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG)
+ old_desc_blocks = fs->super->s_first_meta_bg;
+ else
+ old_desc_blocks =
+ fs->desc_blocks + fs->super->s_reserved_gdt_blocks;
+
+ if (super_blk || (group == 0))
+ ext2fs_mark_block_bitmap(bmap, super_blk);
+
+ if (old_desc_blk) {
+ for (j=0; j < old_desc_blocks; j++)
+ ext2fs_mark_block_bitmap(bmap, old_desc_blk + j);
+ }
+ if (new_desc_blk)
+ ext2fs_mark_block_bitmap(bmap, new_desc_blk);
+
+ return num_blocks;
+}