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 000000000..0326321be
--- /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;
+}
+