inodebitmap_com.c revision 18a1444b4f1e6a0948fd38fa0de382d86cfe04de 
1/*
2
3/usr/src/ext2ed/inodebitmap_com.c
4
5A part of the extended file system 2 disk editor.
6
7-------------------------
8Handles the inode bitmap.
9-------------------------
10
11Please refer to the documentation in blockbitmap_com.c - Those two files are almost equal.
12
13First written on: July 25 1995
14
15Copyright (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
26void 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
48void 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
64void 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
80void 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
106void 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
133void 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
145void 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
159void 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