| /* |
| * rs_bitmap.c --- routine for changing the size of a bitmap |
| * |
| * Copyright (C) 1996, 1997 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 <stdlib.h> |
| #include <fcntl.h> |
| #include <time.h> |
| #ifdef HAVE_SYS_STAT_H |
| #include <sys/stat.h> |
| #endif |
| #ifdef HAVE_SYS_TYPES_H |
| #include <sys/types.h> |
| #endif |
| |
| #include <linux/ext2_fs.h> |
| |
| #include "ext2fs.h" |
| |
| errcode_t ext2fs_resize_generic_bitmap(__u32 new_end, __u32 new_real_end, |
| ext2fs_generic_bitmap bmap) |
| { |
| size_t size, new_size; |
| char *new_bitmap; |
| __u32 bitno; |
| |
| if (!bmap) |
| return EXT2_INVALID_ARGUMENT; |
| |
| EXT2_CHECK_MAGIC(bmap, EXT2_ET_MAGIC_GENERIC_BITMAP); |
| |
| /* |
| * If we're expanding the bitmap, make sure all of the new |
| * parts of the bitmap are zero. |
| */ |
| if (new_end > bmap->end) { |
| bitno = bmap->real_end; |
| if (bitno > new_end) |
| bitno = new_end; |
| for (; bitno > bmap->end; bitno--) |
| ext2fs_clear_bit(bitno - bmap->start, bmap->bitmap); |
| } |
| if (new_real_end == bmap->real_end) { |
| bmap->end = new_end; |
| return 0; |
| } |
| |
| size = ((bmap->real_end - bmap->start) / 8) + 1; |
| new_size = ((new_real_end - bmap->start) / 8) + 1; |
| |
| new_bitmap = realloc(bmap->bitmap, new_size); |
| if (!new_bitmap) |
| return EXT2_NO_MEMORY; |
| if (new_size > size) |
| memset(new_bitmap + size, 0, new_size - size); |
| |
| bmap->bitmap = new_bitmap; |
| bmap->end = new_end; |
| bmap->real_end = new_real_end; |
| return 0; |
| } |
| |
| errcode_t ext2fs_resize_inode_bitmap(__u32 new_end, __u32 new_real_end, |
| ext2fs_inode_bitmap bmap) |
| { |
| errcode_t retval; |
| |
| if (!bmap) |
| return EXT2_INVALID_ARGUMENT; |
| |
| EXT2_CHECK_MAGIC(bmap, EXT2_ET_MAGIC_INODE_BITMAP); |
| |
| bmap->magic = EXT2_ET_MAGIC_GENERIC_BITMAP; |
| retval = ext2fs_resize_generic_bitmap(new_end, new_real_end, |
| bmap); |
| bmap->magic = EXT2_ET_MAGIC_INODE_BITMAP; |
| return retval; |
| } |
| |
| errcode_t ext2fs_resize_block_bitmap(__u32 new_end, __u32 new_real_end, |
| ext2fs_block_bitmap bmap) |
| { |
| errcode_t retval; |
| |
| if (!bmap) |
| return EXT2_INVALID_ARGUMENT; |
| |
| EXT2_CHECK_MAGIC(bmap, EXT2_ET_MAGIC_BLOCK_BITMAP); |
| |
| bmap->magic = EXT2_ET_MAGIC_GENERIC_BITMAP; |
| retval = ext2fs_resize_generic_bitmap(new_end, new_real_end, |
| bmap); |
| bmap->magic = EXT2_ET_MAGIC_BLOCK_BITMAP; |
| return retval; |
| } |
| |