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