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-rw-r--r--e2fslib/alloc_tables.c120
1 files changed, 120 insertions, 0 deletions
diff --git a/e2fslib/alloc_tables.c b/e2fslib/alloc_tables.c
new file mode 100644
index 0000000..ca274cc
--- /dev/null
+++ b/e2fslib/alloc_tables.c
@@ -0,0 +1,120 @@
+/*
+ * 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;
+
+ start_blk = group_blk + 3 + fs->desc_blocks;
+ if (start_blk > last_blk)
+ start_blk = group_blk;
+
+ if (!bmap)
+ bmap = fs->block_map;
+
+ /*
+ * Allocate the inode table
+ */
+ if (!fs->group_desc[group].bg_inode_table) {
+ retval = ext2fs_get_free_blocks(fs, start_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;
+ }
+
+ /*
+ * Allocate the block and inode bitmaps, if necessary
+ */
+ if (fs->stride) {
+ start_blk += fs->inode_blocks_per_group;
+ start_blk += ((fs->stride * group) %
+ (last_blk - start_blk));
+ if (start_blk > last_blk)
+ /* should never happen */
+ 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;
+ }
+ 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;
+}
+