import ext2fs lib to prep for new e2fsprogs

1 files changed, 117 insertions, 0 deletions

diff --git a/e2fsprogs/ext2fs/alloc_tables.c b/e2fsprogs/ext2fs/alloc_tables.c
new file mode 100644
index 0000000..0326321
--- /dev/null
+++ b/e2fsprogs/ext2fs/alloc_tables.c
@@ -0,0 +1,117 @@
+/*
+ * alloc_tables.c --- Allocate tables for a newly initialized
+ * filesystem.  Used by mke2fs when initializing a filesystem
+ *
+ * Copyright (C) 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 "ext2fs.h"
+
+errcode_t ext2fs_allocate_group_table(ext2_filsys fs, dgrp_t group,
+				      ext2fs_block_bitmap bmap)
+{
+	errcode_t	retval;
+	blk_t		group_blk, start_blk, last_blk, new_blk, blk;
+	int		j;
+
+	group_blk = fs->super->s_first_data_block +
+		(group * fs->super->s_blocks_per_group);
+	
+	last_blk = group_blk + fs->super->s_blocks_per_group;
+	if (last_blk >= fs->super->s_blocks_count)
+		last_blk = fs->super->s_blocks_count - 1;
+
+	if (!bmap)
+		bmap = fs->block_map;
+	
+	/*
+	 * Allocate the block and inode bitmaps, if necessary
+	 */
+	if (fs->stride) {
+		start_blk = group_blk + fs->inode_blocks_per_group;
+		start_blk += ((fs->stride * group) %
+			      (last_blk - start_blk));
+		if (start_blk > last_blk)
+			start_blk = group_blk;
+	} else
+		start_blk = group_blk;
+
+	if (!fs->group_desc[group].bg_block_bitmap) {
+		retval = ext2fs_get_free_blocks(fs, start_blk, last_blk,
+						1, bmap, &new_blk);
+		if (retval == EXT2_ET_BLOCK_ALLOC_FAIL) 
+			retval = ext2fs_get_free_blocks(fs, group_blk,
+					last_blk, 1, bmap, &new_blk);
+		if (retval)
+			return retval;
+		ext2fs_mark_block_bitmap(bmap, new_blk);
+		fs->group_desc[group].bg_block_bitmap = new_blk;
+	}
+
+	if (!fs->group_desc[group].bg_inode_bitmap) {
+		retval = ext2fs_get_free_blocks(fs, start_blk, last_blk,
+						1, bmap, &new_blk);
+		if (retval == EXT2_ET_BLOCK_ALLOC_FAIL) 
+			retval = ext2fs_get_free_blocks(fs, group_blk,
+					last_blk, 1, bmap, &new_blk);
+		if (retval)
+			return retval;
+		ext2fs_mark_block_bitmap(bmap, new_blk);
+		fs->group_desc[group].bg_inode_bitmap = new_blk;
+	}
+
+	/*
+	 * Allocate the inode table
+	 */
+	if (!fs->group_desc[group].bg_inode_table) {
+		retval = ext2fs_get_free_blocks(fs, group_blk, last_blk,
+						fs->inode_blocks_per_group,
+						bmap, &new_blk);
+		if (retval)
+			return retval;
+		for (j=0, blk = new_blk;
+		     j < fs->inode_blocks_per_group;
+		     j++, blk++)
+			ext2fs_mark_block_bitmap(bmap, blk);
+		fs->group_desc[group].bg_inode_table = new_blk;
+	}
+
+	
+	return 0;
+}
+
+	
+
+errcode_t ext2fs_allocate_tables(ext2_filsys fs)
+{
+	errcode_t	retval;
+	dgrp_t		i;
+
+	for (i = 0; i < fs->group_desc_count; i++) {
+		retval = ext2fs_allocate_group_table(fs, i, fs->block_map);
+		if (retval)
+			return retval;
+	}
+	return 0;
+}
+