1 /* vi: set sw=4 ts=4: */
5 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 #if defined (__GLIBC__) && !defined(__UCLIBC__)
24 #include <linux/posix_types.h>
31 #include <sys/ioctl.h>
34 /* Grumble... The 2.6.x kernel breaks asm/posix_types.h
35 * so we get to try and cope as best we can... */
36 #include <linux/version.h>
38 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
39 #define __bb_kernel_dev_t __kernel_old_dev_t
40 #elif LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
41 #define __bb_kernel_dev_t __kernel_dev_t
43 #define __bb_kernel_dev_t unsigned short
46 /* Stuff stolen from linux/loop.h */
47 #define LO_NAME_SIZE 64
48 #define LO_KEY_SIZE 32
49 #define LOOP_SET_FD 0x4C00
50 #define LOOP_CLR_FD 0x4C01
51 #define LOOP_SET_STATUS 0x4C02
52 #define LOOP_GET_STATUS 0x4C03
55 __bb_kernel_dev_t lo_device;
56 unsigned long lo_inode;
57 __bb_kernel_dev_t lo_rdevice;
60 int lo_encrypt_key_size;
62 char lo_name[LO_NAME_SIZE];
63 unsigned char lo_encrypt_key[LO_KEY_SIZE];
64 unsigned long lo_init[2];
68 extern int del_loop(const char *device)
72 if ((fd = open(device, O_RDONLY)) < 0) {
73 bb_perror_msg("%s", device);
76 if (ioctl(fd, LOOP_CLR_FD, 0) < 0) {
78 bb_perror_msg("ioctl: LOOP_CLR_FD");
85 extern int set_loop(const char *device, const char *file, int offset,
88 struct loop_info loopinfo;
91 mode = *loopro ? O_RDONLY : O_RDWR;
92 if ((ffd = open(file, mode)) < 0 && !*loopro
93 && (errno != EROFS || (ffd = open(file, mode = O_RDONLY)) < 0)) {
94 bb_perror_msg("%s", file);
97 if ((fd = open(device, mode)) < 0) {
99 bb_perror_msg("%s", device);
102 *loopro = (mode == O_RDONLY);
104 memset(&loopinfo, 0, sizeof(loopinfo));
105 safe_strncpy(loopinfo.lo_name, file, LO_NAME_SIZE);
107 loopinfo.lo_offset = offset;
109 loopinfo.lo_encrypt_key_size = 0;
110 if (ioctl(fd, LOOP_SET_FD, ffd) < 0) {
111 bb_perror_msg("ioctl: LOOP_SET_FD");
116 if (ioctl(fd, LOOP_SET_STATUS, &loopinfo) < 0) {
117 (void) ioctl(fd, LOOP_CLR_FD, 0);
118 bb_perror_msg("ioctl: LOOP_SET_STATUS");
128 extern char *find_unused_loop_device(void)
133 struct loop_info loopinfo;
135 for (i = 0; i <= 7; i++) {
136 sprintf(dev, LOOP_FORMAT, i);
137 if (stat(dev, &statbuf) == 0 && S_ISBLK(statbuf.st_mode)) {
138 if ((fd = open(dev, O_RDONLY)) >= 0) {
139 if (ioctl(fd, LOOP_GET_STATUS, &loopinfo) != 0) {
140 if (errno == ENXIO) { /* probably free */
156 c-file-style: "linux"