1 /* 2 * rs_bitmap.c --- routine for changing the size of a bitmap 3 * 4 * Copyright (C) 1996, 1997 Theodore Ts'o. 5 * 6 * %Begin-Header% 7 * This file may be redistributed under the terms of the GNU Public 8 * License. 9 * %End-Header% 10 */ 11 12 #include <stdio.h> 13 #include <string.h> 14 #if HAVE_UNISTD_H 15 #include <unistd.h> 16 #endif 17 #include <fcntl.h> 18 #include <time.h> 19 #ifdef HAVE_SYS_STAT_H 20 #include <sys/stat.h> 21 #endif 22 #ifdef HAVE_SYS_TYPES_H 23 #include <sys/types.h> 24 #endif 25 26 #include "ext2_fs.h" 27 #include "ext2fs.h" 28 29 errcode_t ext2fs_resize_generic_bitmap(__u32 new_end, __u32 new_real_end, 30 ext2fs_generic_bitmap bmap) 31 { 32 errcode_t retval; 33 size_t size, new_size; 34 __u32 bitno; 35 36 if (!bmap) 37 return EXT2_ET_INVALID_ARGUMENT; 38 39 EXT2_CHECK_MAGIC(bmap, EXT2_ET_MAGIC_GENERIC_BITMAP); 40 41 /* 42 * If we're expanding the bitmap, make sure all of the new 43 * parts of the bitmap are zero. 44 */ 45 if (new_end > bmap->end) { 46 bitno = bmap->real_end; 47 if (bitno > new_end) 48 bitno = new_end; 49 for (; bitno > bmap->end; bitno--) 50 ext2fs_clear_bit(bitno - bmap->start, bmap->bitmap); 51 } 52 if (new_real_end == bmap->real_end) { 53 bmap->end = new_end; 54 return 0; 55 } 56 57 size = ((bmap->real_end - bmap->start) / 8) + 1; 58 new_size = ((new_real_end - bmap->start) / 8) + 1; 59 60 if (size != new_size) { 61 retval = ext2fs_resize_mem(size, new_size, &bmap->bitmap); 62 if (retval) 63 return retval; 64 } 65 if (new_size > size) 66 memset(bmap->bitmap + size, 0, new_size - size); 67 68 bmap->end = new_end; 69 bmap->real_end = new_real_end; 70 return 0; 71 } 72 73 errcode_t ext2fs_resize_inode_bitmap(__u32 new_end, __u32 new_real_end, 74 ext2fs_inode_bitmap bmap) 75 { 76 errcode_t retval; 77 78 if (!bmap) 79 return EXT2_ET_INVALID_ARGUMENT; 80 81 EXT2_CHECK_MAGIC(bmap, EXT2_ET_MAGIC_INODE_BITMAP); 82 83 bmap->magic = EXT2_ET_MAGIC_GENERIC_BITMAP; 84 retval = ext2fs_resize_generic_bitmap(new_end, new_real_end, 85 bmap); 86 bmap->magic = EXT2_ET_MAGIC_INODE_BITMAP; 87 return retval; 88 } 89 90 errcode_t ext2fs_resize_block_bitmap(__u32 new_end, __u32 new_real_end, 91 ext2fs_block_bitmap bmap) 92 { 93 errcode_t retval; 94 95 if (!bmap) 96 return EXT2_ET_INVALID_ARGUMENT; 97 98 EXT2_CHECK_MAGIC(bmap, EXT2_ET_MAGIC_BLOCK_BITMAP); 99 100 bmap->magic = EXT2_ET_MAGIC_GENERIC_BITMAP; 101 retval = ext2fs_resize_generic_bitmap(new_end, new_real_end, 102 bmap); 103 bmap->magic = EXT2_ET_MAGIC_BLOCK_BITMAP; 104 return retval; 105 } 106 107
