ext2ed/inodebitmap_com.c

   1 /*
   2
   3 /usr/src/ext2ed/inodebitmap_com.c
   4
   5 A part of the extended file system 2 disk editor.
   6
   7 -------------------------
   8 Handles the inode bitmap.
   9 -------------------------
  10
  11 Please refer to the documentation in blockbitmap_com.c - Those two files are almost equal.
  12
  13 First written on: July 25 1995
  14
  15 Copyright (C) 1995 Gadi Oxman
  16
  17 */
  18
  19 #include "config.h"
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23
  24 #include "ext2ed.h"
  25
  26
  27 void type_ext2_inode_bitmap___entry (char *command_line)
  28
  29 {
  30         unsigned long entry_num;
  31         char *ptr,buffer [80];
  32
  33         ptr=parse_word (command_line,buffer);
  34         if (*ptr==0) {
  35                 wprintw (command_win,"Error - No argument specified\n");refresh_command_win ();return;
  36         }
  37         ptr=parse_word (ptr,buffer);
  38
  39         entry_num=atol (buffer);
  40
  41         if (entry_num >= file_system_info.super_block.s_inodes_per_group) {
  42                 wprintw (command_win,"Error - Entry number out of bounds\n");refresh_command_win ();return;
  43         }
  44
  45         inode_bitmap_info.entry_num=entry_num;
  46         strcpy (buffer,"show");dispatch (buffer);
  47 }
  48
  49 void type_ext2_inode_bitmap___next (char *command_line)
  50
  51 {
  52         long entry_offset=1;
  53         char *ptr,buffer [80];
  54
  55         ptr=parse_word (command_line,buffer);
  56         if (*ptr!=0) {
  57                 ptr=parse_word (ptr,buffer);
  58                 entry_offset=atol (buffer);
  59         }
  60
  61         sprintf (buffer,"entry %ld",inode_bitmap_info.entry_num+entry_offset);
  62         dispatch (buffer);
  63 }
  64
  65 void type_ext2_inode_bitmap___prev (char *command_line)
  66
  67 {
  68         long entry_offset=1;
  69         char *ptr,buffer [80];
  70
  71         ptr=parse_word (command_line,buffer);
  72         if (*ptr!=0) {
  73                 ptr=parse_word (ptr,buffer);
  74                 entry_offset=atol (buffer);
  75         }
  76
  77         sprintf (buffer,"entry %ld",inode_bitmap_info.entry_num-entry_offset);
  78         dispatch (buffer);
  79 }
  80
  81 void type_ext2_inode_bitmap___allocate (char *command_line)
  82
  83 {
  84         long entry_num,num=1;
  85         char *ptr,buffer [80];
  86
  87         ptr=parse_word (command_line,buffer);
  88         if (*ptr!=0) {
  89                 ptr=parse_word (ptr,buffer);
  90                 num=atol (buffer);
  91         }
  92
  93         entry_num=inode_bitmap_info.entry_num;
  94         if (num > file_system_info.super_block.s_inodes_per_group-entry_num) {
  95                 wprintw (command_win,"Error - There aren't that much inodes in the group\n");
  96                 refresh_command_win ();return;
  97         }
  98
  99         while (num) {
 100                 allocate_inode (entry_num);
 101                 num--;entry_num++;
 102         }
 103
 104         dispatch ("show");
 105 }
 106
 107 void type_ext2_inode_bitmap___deallocate (char *command_line)
 108
 109 {
 110         long entry_num,num=1;
 111         char *ptr,buffer [80];
 112
 113         ptr=parse_word (command_line,buffer);
 114         if (*ptr!=0) {
 115                 ptr=parse_word (ptr,buffer);
 116                 num=atol (buffer);
 117         }
 118
 119         entry_num=inode_bitmap_info.entry_num;
 120         if (num > file_system_info.super_block.s_inodes_per_group-entry_num) {
 121                 wprintw (command_win,"Error - There aren't that much inodes in the group\n");
 122                 refresh_command_win ();return;
 123         }
 124
 125         while (num) {
 126                 deallocate_inode (entry_num);
 127                 num--;entry_num++;
 128         }
 129
 130         dispatch ("show");
 131 }
 132
 133
 134 void allocate_inode (long entry_num)
 135
 136 {
 137         unsigned char bit_mask=1;
 138         int byte_offset,j;
 139
 140         byte_offset=entry_num/8;
 141         for (j=0;j<entry_num%8;j++)
 142                 bit_mask*=2;
 143         type_data.u.buffer [byte_offset] |= bit_mask;
 144 }
 145
 146 void deallocate_inode (long entry_num)
 147
 148 {
 149         unsigned char bit_mask=1;
 150         int byte_offset,j;
 151
 152         byte_offset=entry_num/8;
 153         for (j=0;j<entry_num%8;j++)
 154                 bit_mask*=2;
 155         bit_mask^=0xff;
 156
 157         type_data.u.buffer [byte_offset] &= bit_mask;
 158 }
 159
 160 void type_ext2_inode_bitmap___show (char *command_line)
 161
 162 {
 163         int i,j;
 164         unsigned char *ptr;
 165         unsigned long inode_num,entry_num;
 166
 167         ptr=type_data.u.buffer;
 168         show_pad_info.line=0;show_pad_info.max_line=-1;
 169
 170         wmove (show_pad,0,0);
 171         for (i=0,entry_num=0;i<file_system_info.super_block.s_inodes_per_group/8;i++,ptr++) {
 172                 for (j=1;j<=128;j*=2) {
 173                         if (entry_num==inode_bitmap_info.entry_num) {
 174                                 wattrset (show_pad,A_REVERSE);
 175                                 show_pad_info.line=show_pad_info.max_line-show_pad_info.display_lines/2;
 176                         }
 177
 178                         if ((*ptr) & j)
 179                                 wprintw (show_pad,"1");
 180                         else
 181                                 wprintw (show_pad,"0");
 182
 183                         if (entry_num==inode_bitmap_info.entry_num)
 184                                 wattrset (show_pad,A_NORMAL);
 185
 186                         entry_num++;
 187                 }
 188                 wprintw (show_pad," ");
 189                 if (i%8==7) {
 190                         wprintw (show_pad,"\n");
 191                         show_pad_info.max_line++;
 192                 }
 193         }
 194
 195         if (i%8!=7) {
 196                 wprintw (show_pad,"\n");
 197                 show_pad_info.max_line++;
 198         }
 199
 200         refresh_show_pad ();
 201         show_info ();
 202         wmove (show_win,1,0);wprintw (show_win,"Inode bitmap of block group %ld\n",inode_bitmap_info.group_num);
 203
 204         inode_num=1+inode_bitmap_info.entry_num+inode_bitmap_info.group_num*file_system_info.super_block.s_inodes_per_group;
 205         wprintw (show_win,"Status of inode %ld - ",inode_num);
 206         ptr=type_data.u.buffer+inode_bitmap_info.entry_num/8;
 207         j=1;
 208         for (i=inode_bitmap_info.entry_num % 8;i>0;i--)
 209                 j*=2;
 210         if ((*ptr) & j)
 211                 wprintw (show_win,"Allocated\n");
 212         else
 213                 wprintw (show_win,"Free\n");
 214         refresh_show_win ();
 215 }