Loop.cpp revision 344ca10856f3d3087a3288ce8f91ad83665d93fb
1a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat/* 2a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat * Copyright (C) 2008 The Android Open Source Project 3a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat * 4a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat * Licensed under the Apache License, Version 2.0 (the "License"); 5a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat * you may not use this file except in compliance with the License. 6a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat * You may obtain a copy of the License at 7a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat * 8a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat * http://www.apache.org/licenses/LICENSE-2.0 9a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat * 10a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat * Unless required by applicable law or agreed to in writing, software 11a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat * distributed under the License is distributed on an "AS IS" BASIS, 12a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat * See the License for the specific language governing permissions and 14a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat * limitations under the License. 15a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat */ 16a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 17a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat#include <stdio.h> 1837dcda68d334f70e1f7f69a9817def65fe3ee717Olivier Bailly#include <stdlib.h> 19a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat#include <fcntl.h> 20a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat#include <unistd.h> 21a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat#include <errno.h> 22a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat#include <string.h> 23a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 24344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root#include <sys/mount.h> 258da6bcb006f4e4257cdd685e35e910a6334f6ceaSan Mehat#include <sys/types.h> 268da6bcb006f4e4257cdd685e35e910a6334f6ceaSan Mehat#include <sys/stat.h> 2737dcda68d334f70e1f7f69a9817def65fe3ee717Olivier Bailly#include <sys/ioctl.h> 288da6bcb006f4e4257cdd685e35e910a6334f6ceaSan Mehat 29d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat#include <linux/kdev_t.h> 30d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat 31a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat#define LOG_TAG "Vold" 32a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 33a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat#include <cutils/log.h> 34a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 35d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat#include <sysutils/SocketClient.h> 36a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat#include "Loop.h" 37344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root#include "Asec.h" 38a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 39d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehatint Loop::dumpState(SocketClient *c) { 40d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat int i; 41d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat int fd; 42d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat char filename[256]; 43d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat 44d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat for (i = 0; i < LOOP_MAX; i++) { 45508c0e1605b795bbb51cb47d955b89f3df26ca94Kenny Root struct loop_info64 li; 46d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat int rc; 47d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat 48d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat sprintf(filename, "/dev/block/loop%d", i); 49d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat 50d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat if ((fd = open(filename, O_RDWR)) < 0) { 51d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat if (errno != ENOENT) { 5297ac40e4e6f3ed0bd5d6878d7d8d4a54fcaecb76San Mehat SLOGE("Unable to open %s (%s)", filename, strerror(errno)); 53d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat } else { 54d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat continue; 55d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat } 56d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat return -1; 57d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat } 58d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat 59508c0e1605b795bbb51cb47d955b89f3df26ca94Kenny Root rc = ioctl(fd, LOOP_GET_STATUS64, &li); 60d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat close(fd); 61d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat if (rc < 0 && errno == ENXIO) { 62d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat continue; 63d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat } 64d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat 65d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat if (rc < 0) { 6697ac40e4e6f3ed0bd5d6878d7d8d4a54fcaecb76San Mehat SLOGE("Unable to get loop status for %s (%s)", filename, 67d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat strerror(errno)); 68d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat return -1; 69d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat } 70d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat char *tmp = NULL; 71508c0e1605b795bbb51cb47d955b89f3df26ca94Kenny Root asprintf(&tmp, "%s %d %lld:%lld %llu %lld:%lld %lld 0x%x {%s} {%s}", filename, li.lo_number, 72d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat MAJOR(li.lo_device), MINOR(li.lo_device), li.lo_inode, MAJOR(li.lo_rdevice), 73508c0e1605b795bbb51cb47d955b89f3df26ca94Kenny Root MINOR(li.lo_rdevice), li.lo_offset, li.lo_flags, li.lo_crypt_name, 74508c0e1605b795bbb51cb47d955b89f3df26ca94Kenny Root li.lo_file_name); 75d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat c->sendMsg(0, tmp, false); 76d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat free(tmp); 77d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat } 78d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat return 0; 79d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat} 80d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat 81d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehatint Loop::lookupActive(const char *id, char *buffer, size_t len) { 82a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat int i; 83a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat int fd; 84a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat char filename[256]; 85a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 86a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat memset(buffer, 0, len); 87a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 88a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat for (i = 0; i < LOOP_MAX; i++) { 89508c0e1605b795bbb51cb47d955b89f3df26ca94Kenny Root struct loop_info64 li; 90a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat int rc; 91a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 92a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat sprintf(filename, "/dev/block/loop%d", i); 93a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 94a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat if ((fd = open(filename, O_RDWR)) < 0) { 95b78a32c1d5eeb243bdac0eaf18effb1897f1ee67San Mehat if (errno != ENOENT) { 9697ac40e4e6f3ed0bd5d6878d7d8d4a54fcaecb76San Mehat SLOGE("Unable to open %s (%s)", filename, strerror(errno)); 97d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat } else { 98d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat continue; 99b78a32c1d5eeb243bdac0eaf18effb1897f1ee67San Mehat } 100a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat return -1; 101a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat } 102a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 103508c0e1605b795bbb51cb47d955b89f3df26ca94Kenny Root rc = ioctl(fd, LOOP_GET_STATUS64, &li); 104a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat close(fd); 105a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat if (rc < 0 && errno == ENXIO) { 106a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat continue; 107a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat } 108a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 109a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat if (rc < 0) { 11097ac40e4e6f3ed0bd5d6878d7d8d4a54fcaecb76San Mehat SLOGE("Unable to get loop status for %s (%s)", filename, 111a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat strerror(errno)); 112a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat return -1; 113a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat } 114508c0e1605b795bbb51cb47d955b89f3df26ca94Kenny Root if (!strncmp((const char*) li.lo_crypt_name, id, LO_NAME_SIZE)) { 115a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat break; 116a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat } 117a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat } 118a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 119a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat if (i == LOOP_MAX) { 120a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat errno = ENOENT; 121a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat return -1; 122a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat } 123a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat strncpy(buffer, filename, len -1); 124a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat return 0; 125a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat} 126a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 127d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehatint Loop::create(const char *id, const char *loopFile, char *loopDeviceBuffer, size_t len) { 128a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat int i; 129a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat int fd; 130a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat char filename[256]; 131a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 132a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat for (i = 0; i < LOOP_MAX; i++) { 1337c16502dbc16658c45165edb1c54df6b8b02d9caKenny Root struct loop_info64 li; 134a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat int rc; 135a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 136a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat sprintf(filename, "/dev/block/loop%d", i); 137a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 1388da6bcb006f4e4257cdd685e35e910a6334f6ceaSan Mehat /* 1398da6bcb006f4e4257cdd685e35e910a6334f6ceaSan Mehat * The kernel starts us off with 8 loop nodes, but more 1408da6bcb006f4e4257cdd685e35e910a6334f6ceaSan Mehat * are created on-demand if needed. 1418da6bcb006f4e4257cdd685e35e910a6334f6ceaSan Mehat */ 1428da6bcb006f4e4257cdd685e35e910a6334f6ceaSan Mehat mode_t mode = 0660 | S_IFBLK; 143b78a32c1d5eeb243bdac0eaf18effb1897f1ee67San Mehat unsigned int dev = (0xff & i) | ((i << 12) & 0xfff00000) | (7 << 8); 1448da6bcb006f4e4257cdd685e35e910a6334f6ceaSan Mehat if (mknod(filename, mode, dev) < 0) { 1458da6bcb006f4e4257cdd685e35e910a6334f6ceaSan Mehat if (errno != EEXIST) { 14697ac40e4e6f3ed0bd5d6878d7d8d4a54fcaecb76San Mehat SLOGE("Error creating loop device node (%s)", strerror(errno)); 1478da6bcb006f4e4257cdd685e35e910a6334f6ceaSan Mehat return -1; 1488da6bcb006f4e4257cdd685e35e910a6334f6ceaSan Mehat } 1498da6bcb006f4e4257cdd685e35e910a6334f6ceaSan Mehat } 1508da6bcb006f4e4257cdd685e35e910a6334f6ceaSan Mehat 151a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat if ((fd = open(filename, O_RDWR)) < 0) { 15297ac40e4e6f3ed0bd5d6878d7d8d4a54fcaecb76San Mehat SLOGE("Unable to open %s (%s)", filename, strerror(errno)); 153a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat return -1; 154a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat } 155a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 1567c16502dbc16658c45165edb1c54df6b8b02d9caKenny Root rc = ioctl(fd, LOOP_GET_STATUS64, &li); 157a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat if (rc < 0 && errno == ENXIO) 158a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat break; 159a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 1608da6bcb006f4e4257cdd685e35e910a6334f6ceaSan Mehat close(fd); 1618da6bcb006f4e4257cdd685e35e910a6334f6ceaSan Mehat 162a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat if (rc < 0) { 16397ac40e4e6f3ed0bd5d6878d7d8d4a54fcaecb76San Mehat SLOGE("Unable to get loop status for %s (%s)", filename, 164a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat strerror(errno)); 165a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat return -1; 166a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat } 167a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat } 168a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 169a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat if (i == LOOP_MAX) { 17097ac40e4e6f3ed0bd5d6878d7d8d4a54fcaecb76San Mehat SLOGE("Exhausted all loop devices"); 171a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat errno = ENOSPC; 172a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat return -1; 173a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat } 174a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 1758da6bcb006f4e4257cdd685e35e910a6334f6ceaSan Mehat strncpy(loopDeviceBuffer, filename, len -1); 176a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 1778da6bcb006f4e4257cdd685e35e910a6334f6ceaSan Mehat int file_fd; 178a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 179a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat if ((file_fd = open(loopFile, O_RDWR)) < 0) { 18097ac40e4e6f3ed0bd5d6878d7d8d4a54fcaecb76San Mehat SLOGE("Unable to open %s (%s)", loopFile, strerror(errno)); 181a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat close(fd); 182a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat return -1; 183a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat } 184a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 185a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat if (ioctl(fd, LOOP_SET_FD, file_fd) < 0) { 18697ac40e4e6f3ed0bd5d6878d7d8d4a54fcaecb76San Mehat SLOGE("Error setting up loopback interface (%s)", strerror(errno)); 187a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat close(file_fd); 188a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat close(fd); 189a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat return -1; 190a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat } 191a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 192508c0e1605b795bbb51cb47d955b89f3df26ca94Kenny Root struct loop_info64 li; 193a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 194a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat memset(&li, 0, sizeof(li)); 195092aa1c585fedd9e169eece41b8a471f1739908aPeter Bohm strlcpy((char*) li.lo_crypt_name, id, LO_NAME_SIZE); 196092aa1c585fedd9e169eece41b8a471f1739908aPeter Bohm strlcpy((char*) li.lo_file_name, loopFile, LO_NAME_SIZE); 197a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 198508c0e1605b795bbb51cb47d955b89f3df26ca94Kenny Root if (ioctl(fd, LOOP_SET_STATUS64, &li) < 0) { 19997ac40e4e6f3ed0bd5d6878d7d8d4a54fcaecb76San Mehat SLOGE("Error setting loopback status (%s)", strerror(errno)); 200a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat close(file_fd); 201a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat close(fd); 202a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat return -1; 203a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat } 204a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 205a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat close(fd); 206a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat close(file_fd); 207a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 208a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat return 0; 209a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat} 210a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 211a19b250bd273455933ca3502cf2c2e0a803aff77San Mehatint Loop::destroyByDevice(const char *loopDevice) { 212a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat int device_fd; 213a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 214a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat device_fd = open(loopDevice, O_RDONLY); 215a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat if (device_fd < 0) { 21697ac40e4e6f3ed0bd5d6878d7d8d4a54fcaecb76San Mehat SLOGE("Failed to open loop (%d)", errno); 217a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat return -1; 218a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat } 219a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 220a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat if (ioctl(device_fd, LOOP_CLR_FD, 0) < 0) { 22197ac40e4e6f3ed0bd5d6878d7d8d4a54fcaecb76San Mehat SLOGE("Failed to destroy loop (%d)", errno); 222a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat close(device_fd); 223a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat return -1; 224a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat } 225a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 226a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat close(device_fd); 227a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat return 0; 228a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat} 229a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 230a19b250bd273455933ca3502cf2c2e0a803aff77San Mehatint Loop::destroyByFile(const char *loopFile) { 231a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat errno = ENOSYS; 232a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat return -1; 233a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat} 234a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 2358b8f71b1d760411279f3b07a5c97709f052c689eSan Mehatint Loop::createImageFile(const char *file, unsigned int numSectors) { 236a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat int fd; 237a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 238a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat if ((fd = creat(file, 0600)) < 0) { 23997ac40e4e6f3ed0bd5d6878d7d8d4a54fcaecb76San Mehat SLOGE("Error creating imagefile (%s)", strerror(errno)); 240a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat return -1; 241a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat } 242a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 2438b8f71b1d760411279f3b07a5c97709f052c689eSan Mehat if (ftruncate(fd, numSectors * 512) < 0) { 24497ac40e4e6f3ed0bd5d6878d7d8d4a54fcaecb76San Mehat SLOGE("Error truncating imagefile (%s)", strerror(errno)); 245a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat close(fd); 246a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat return -1; 247a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat } 248a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat close(fd); 249a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat return 0; 250a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat} 251344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root 252344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Rootint Loop::lookupInfo(const char *loopDevice, struct asec_superblock *sb, unsigned int *nr_sec) { 253344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root int fd; 254344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root struct asec_superblock buffer; 255344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root 256344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root if ((fd = open(loopDevice, O_RDONLY)) < 0) { 257344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root SLOGE("Failed to open loopdevice (%s)", strerror(errno)); 258344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root destroyByDevice(loopDevice); 259344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root return -1; 260344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root } 261344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root 262344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root if (ioctl(fd, BLKGETSIZE, nr_sec)) { 263344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root SLOGE("Failed to get loop size (%s)", strerror(errno)); 264344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root destroyByDevice(loopDevice); 265344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root close(fd); 266344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root return -1; 267344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root } 268344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root 269344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root /* 270344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root * Try to read superblock. 271344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root */ 272344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root memset(&buffer, 0, sizeof(struct asec_superblock)); 273344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root if (lseek(fd, ((*nr_sec - 1) * 512), SEEK_SET) < 0) { 274344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root SLOGE("lseek failed (%s)", strerror(errno)); 275344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root close(fd); 276344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root destroyByDevice(loopDevice); 277344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root return -1; 278344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root } 279344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root if (read(fd, &buffer, sizeof(struct asec_superblock)) != sizeof(struct asec_superblock)) { 280344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root SLOGE("superblock read failed (%s)", strerror(errno)); 281344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root close(fd); 282344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root destroyByDevice(loopDevice); 283344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root return -1; 284344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root } 285344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root close(fd); 286344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root 287344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root /* 288344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root * Superblock successfully read. Copy to caller's struct. 289344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root */ 290344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root memcpy(sb, &buffer, sizeof(struct asec_superblock)); 291344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root return 0; 292344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root} 293