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
22 #if defined (__GLIBC__) && !defined(__UCLIBC__)
23 #include <asm/posix_types.h>
30 #include <sys/ioctl.h>
33 /* Grumble... The 2.6.x kernel breaks asm/posix_types.h
34 * so we get to try and cope as best we can... */
35 #include <linux/version.h>
37 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
38 #define __bb_kernel_dev_t __kernel_old_dev_t
39 #elif LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
40 #define __bb_kernel_dev_t __kernel_dev_t
42 #define __bb_kernel_dev_t unsigned short
45 /* Stuff stolen from linux/loop.h */
46 #define LO_NAME_SIZE 64
47 #define LO_KEY_SIZE 32
48 #define LOOP_SET_FD 0x4C00
49 #define LOOP_CLR_FD 0x4C01
50 #define LOOP_SET_STATUS 0x4C02
51 #define LOOP_GET_STATUS 0x4C03
54 __bb_kernel_dev_t lo_device;
55 unsigned long lo_inode;
56 __bb_kernel_dev_t lo_rdevice;
59 int lo_encrypt_key_size;
61 char lo_name[LO_NAME_SIZE];
62 unsigned char lo_encrypt_key[LO_KEY_SIZE];
63 unsigned long lo_init[2];
67 extern int del_loop(const char *device)
71 if ((fd = open(device, O_RDONLY)) < 0) {
72 bb_perror_msg("%s", device);
75 if (ioctl(fd, LOOP_CLR_FD, 0) < 0) {
77 bb_perror_msg("ioctl: LOOP_CLR_FD");
84 extern int set_loop(const char *device, const char *file, int offset,
87 struct loop_info loopinfo;
90 mode = *loopro ? O_RDONLY : O_RDWR;
91 if ((ffd = open(file, mode)) < 0 && !*loopro
92 && (errno != EROFS || (ffd = open(file, mode = O_RDONLY)) < 0)) {
93 bb_perror_msg("%s", file);
96 if ((fd = open(device, mode)) < 0) {
98 bb_perror_msg("%s", device);
101 *loopro = (mode == O_RDONLY);
103 memset(&loopinfo, 0, sizeof(loopinfo));
104 safe_strncpy(loopinfo.lo_name, file, LO_NAME_SIZE);
106 loopinfo.lo_offset = offset;
108 loopinfo.lo_encrypt_key_size = 0;
109 if (ioctl(fd, LOOP_SET_FD, ffd) < 0) {
110 bb_perror_msg("ioctl: LOOP_SET_FD");
115 if (ioctl(fd, LOOP_SET_STATUS, &loopinfo) < 0) {
116 (void) ioctl(fd, LOOP_CLR_FD, 0);
117 bb_perror_msg("ioctl: LOOP_SET_STATUS");
127 extern char *find_unused_loop_device(void)
132 struct loop_info loopinfo;
134 for (i = 0; i <= 7; i++) {
135 sprintf(dev, LOOP_FORMAT, i);
136 if (stat(dev, &statbuf) == 0 && S_ISBLK(statbuf.st_mode)) {
137 if ((fd = open(dev, O_RDONLY)) >= 0) {
138 if (ioctl(fd, LOOP_GET_STATUS, &loopinfo) != 0) {
139 if (errno == ENXIO) { /* probably free */
155 c-file-style: "linux"