/* vi: set sw=4 ts=4: */ /* * bitmaps.c --- routines to read, write, and manipulate the inode and * block bitmaps. * * Copyright (C) 1993, 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 "ext2fs.h" static errcode_t make_bitmap(__u32 start, __u32 end, __u32 real_end, const char *descr, char *init_map, ext2fs_generic_bitmap *ret) { ext2fs_generic_bitmap bitmap; errcode_t retval; size_t size; retval = ext2fs_get_mem(sizeof(struct ext2fs_struct_generic_bitmap), &bitmap); if (retval) return retval; bitmap->magic = EXT2_ET_MAGIC_GENERIC_BITMAP; bitmap->fs = NULL; bitmap->start = start; bitmap->end = end; bitmap->real_end = real_end; bitmap->base_error_code = EXT2_ET_BAD_GENERIC_MARK; if (descr) { retval = ext2fs_get_mem(strlen(descr)+1, &bitmap->description); if (retval) { ext2fs_free_mem(&bitmap); return retval; } strcpy(bitmap->description, descr); } else bitmap->description = 0; size = (size_t) (((bitmap->real_end - bitmap->start) / 8) + 1); retval = ext2fs_get_mem(size, &bitmap->bitmap); if (retval) { ext2fs_free_mem(&bitmap->description); ext2fs_free_mem(&bitmap); return retval; } if (init_map) memcpy(bitmap->bitmap, init_map, size); else memset(bitmap->bitmap, 0, size); *ret = bitmap; return 0; } errcode_t ext2fs_allocate_generic_bitmap(__u32 start, __u32 end, __u32 real_end, const char *descr, ext2fs_generic_bitmap *ret) { return make_bitmap(start, end, real_end, descr, 0, ret); } errcode_t ext2fs_copy_bitmap(ext2fs_generic_bitmap src, ext2fs_generic_bitmap *dest) { errcode_t retval; ext2fs_generic_bitmap new_map; retval = make_bitmap(src->start, src->end, src->real_end, src->description, src->bitmap, &new_map); if (retval) return retval; new_map->magic = src->magic; new_map->fs = src->fs; new_map->base_error_code = src->base_error_code; *dest = new_map; return 0; } void ext2fs_set_bitmap_padding(ext2fs_generic_bitmap map) { __u32 i, j; for (i=map->end+1, j = i - map->start; i <= map->real_end; i++, j++) ext2fs_set_bit(j, map->bitmap); } errcode_t ext2fs_allocate_inode_bitmap(ext2_filsys fs, const char *descr, ext2fs_inode_bitmap *ret) { ext2fs_inode_bitmap bitmap; errcode_t retval; __u32 start, end, real_end; EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); fs->write_bitmaps = ext2fs_write_bitmaps; start = 1; end = fs->super->s_inodes_count; real_end = (EXT2_INODES_PER_GROUP(fs->super) * fs->group_desc_count); retval = ext2fs_allocate_generic_bitmap(start, end, real_end, descr, &bitmap); if (retval) return retval; bitmap->magic = EXT2_ET_MAGIC_INODE_BITMAP; bitmap->fs = fs; bitmap->base_error_code = EXT2_ET_BAD_INODE_MARK; *ret = bitmap; return 0; } errcode_t ext2fs_allocate_block_bitmap(ext2_filsys fs, const char *descr, ext2fs_block_bitmap *ret) { ext2fs_block_bitmap bitmap; errcode_t retval; __u32 start, end, real_end; EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); fs->write_bitmaps = ext2fs_write_bitmaps; start = fs->super->s_first_data_block; end = fs->super->s_blocks_count-1; real_end = (EXT2_BLOCKS_PER_GROUP(fs->super) * fs->group_desc_count)-1 + start; retval = ext2fs_allocate_generic_bitmap(start, end, real_end, descr, &bitmap); if (retval) return retval; bitmap->magic = EXT2_ET_MAGIC_BLOCK_BITMAP; bitmap->fs = fs; bitmap->base_error_code = EXT2_ET_BAD_BLOCK_MARK; *ret = bitmap; return 0; } errcode_t ext2fs_fudge_inode_bitmap_end(ext2fs_inode_bitmap bitmap, ext2_ino_t end, ext2_ino_t *oend) { EXT2_CHECK_MAGIC(bitmap, EXT2_ET_MAGIC_INODE_BITMAP); if (end > bitmap->real_end) return EXT2_ET_FUDGE_INODE_BITMAP_END; if (oend) *oend = bitmap->end; bitmap->end = end; return 0; } errcode_t ext2fs_fudge_block_bitmap_end(ext2fs_block_bitmap bitmap, blk_t end, blk_t *oend) { EXT2_CHECK_MAGIC(bitmap, EXT2_ET_MAGIC_BLOCK_BITMAP); if (end > bitmap->real_end) return EXT2_ET_FUDGE_BLOCK_BITMAP_END; if (oend) *oend = bitmap->end; bitmap->end = end; return 0; } void ext2fs_clear_inode_bitmap(ext2fs_inode_bitmap bitmap) { if (!bitmap || (bitmap->magic != EXT2_ET_MAGIC_INODE_BITMAP)) return; memset(bitmap->bitmap, 0, (size_t) (((bitmap->real_end - bitmap->start) / 8) + 1)); } void ext2fs_clear_block_bitmap(ext2fs_block_bitmap bitmap) { if (!bitmap || (bitmap->magic != EXT2_ET_MAGIC_BLOCK_BITMAP)) return; memset(bitmap->bitmap, 0, (size_t) (((bitmap->real_end - bitmap->start) / 8) + 1)); }