Loop.cpp revision 2152266deb82f96ef5a22d3a56a76bf6177e1e04
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" 38684e662502a310868da052192b80604234b66711Stephen Smalley#include "sehandle.h" 39a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 40d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehatint Loop::dumpState(SocketClient *c) { 41d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat int i; 42d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat int fd; 43d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat char filename[256]; 44d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat 45d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat for (i = 0; i < LOOP_MAX; i++) { 46508c0e1605b795bbb51cb47d955b89f3df26ca94Kenny Root struct loop_info64 li; 47d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat int rc; 48d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat 49d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat sprintf(filename, "/dev/block/loop%d", i); 50d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat 51d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat if ((fd = open(filename, O_RDWR)) < 0) { 52d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat if (errno != ENOENT) { 5397ac40e4e6f3ed0bd5d6878d7d8d4a54fcaecb76San Mehat SLOGE("Unable to open %s (%s)", filename, strerror(errno)); 54d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat } else { 55d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat continue; 56d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat } 57d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat return -1; 58d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat } 59d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat 60508c0e1605b795bbb51cb47d955b89f3df26ca94Kenny Root rc = ioctl(fd, LOOP_GET_STATUS64, &li); 61d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat close(fd); 62d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat if (rc < 0 && errno == ENXIO) { 63d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat continue; 64d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat } 65d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat 66d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat if (rc < 0) { 6797ac40e4e6f3ed0bd5d6878d7d8d4a54fcaecb76San Mehat SLOGE("Unable to get loop status for %s (%s)", filename, 68d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat strerror(errno)); 69d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat return -1; 70d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat } 71d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat char *tmp = NULL; 72508c0e1605b795bbb51cb47d955b89f3df26ca94Kenny Root asprintf(&tmp, "%s %d %lld:%lld %llu %lld:%lld %lld 0x%x {%s} {%s}", filename, li.lo_number, 73d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat MAJOR(li.lo_device), MINOR(li.lo_device), li.lo_inode, MAJOR(li.lo_rdevice), 74508c0e1605b795bbb51cb47d955b89f3df26ca94Kenny Root MINOR(li.lo_rdevice), li.lo_offset, li.lo_flags, li.lo_crypt_name, 75508c0e1605b795bbb51cb47d955b89f3df26ca94Kenny Root li.lo_file_name); 76d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat c->sendMsg(0, tmp, false); 77d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat free(tmp); 78d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat } 79d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat return 0; 80d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat} 81d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat 82d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehatint Loop::lookupActive(const char *id, char *buffer, size_t len) { 83a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat int i; 84a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat int fd; 85a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat char filename[256]; 86a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 87a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat memset(buffer, 0, len); 88a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 89a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat for (i = 0; i < LOOP_MAX; i++) { 90508c0e1605b795bbb51cb47d955b89f3df26ca94Kenny Root struct loop_info64 li; 91a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat int rc; 92a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 93a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat sprintf(filename, "/dev/block/loop%d", i); 94a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 95a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat if ((fd = open(filename, O_RDWR)) < 0) { 96b78a32c1d5eeb243bdac0eaf18effb1897f1ee67San Mehat if (errno != ENOENT) { 9797ac40e4e6f3ed0bd5d6878d7d8d4a54fcaecb76San Mehat SLOGE("Unable to open %s (%s)", filename, strerror(errno)); 98d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat } else { 99d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehat continue; 100b78a32c1d5eeb243bdac0eaf18effb1897f1ee67San Mehat } 101a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat return -1; 102a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat } 103a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 104508c0e1605b795bbb51cb47d955b89f3df26ca94Kenny Root rc = ioctl(fd, LOOP_GET_STATUS64, &li); 105a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat close(fd); 106a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat if (rc < 0 && errno == ENXIO) { 107a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat continue; 108a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat } 109a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 110a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat if (rc < 0) { 11197ac40e4e6f3ed0bd5d6878d7d8d4a54fcaecb76San Mehat SLOGE("Unable to get loop status for %s (%s)", filename, 112a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat strerror(errno)); 113a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat return -1; 114a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat } 115508c0e1605b795bbb51cb47d955b89f3df26ca94Kenny Root if (!strncmp((const char*) li.lo_crypt_name, id, LO_NAME_SIZE)) { 116a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat break; 117a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat } 118a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat } 119a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 120a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat if (i == LOOP_MAX) { 121a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat errno = ENOENT; 122a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat return -1; 123a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat } 1242152266deb82f96ef5a22d3a56a76bf6177e1e04Henrik Baard strlcpy(buffer, filename, len); 125a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat return 0; 126a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat} 127a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 128d9a4e358614a0c5f60cc76c0636ee4bb02004a32San Mehatint Loop::create(const char *id, const char *loopFile, char *loopDeviceBuffer, size_t len) { 129a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat int i; 130a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat int fd; 131a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat char filename[256]; 132a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 133a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat for (i = 0; i < LOOP_MAX; i++) { 1347c16502dbc16658c45165edb1c54df6b8b02d9caKenny Root struct loop_info64 li; 135a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat int rc; 136684e662502a310868da052192b80604234b66711Stephen Smalley char *secontext = NULL; 137a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 138a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat sprintf(filename, "/dev/block/loop%d", i); 139a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 1408da6bcb006f4e4257cdd685e35e910a6334f6ceaSan Mehat /* 1418da6bcb006f4e4257cdd685e35e910a6334f6ceaSan Mehat * The kernel starts us off with 8 loop nodes, but more 1428da6bcb006f4e4257cdd685e35e910a6334f6ceaSan Mehat * are created on-demand if needed. 1438da6bcb006f4e4257cdd685e35e910a6334f6ceaSan Mehat */ 1448da6bcb006f4e4257cdd685e35e910a6334f6ceaSan Mehat mode_t mode = 0660 | S_IFBLK; 145b78a32c1d5eeb243bdac0eaf18effb1897f1ee67San Mehat unsigned int dev = (0xff & i) | ((i << 12) & 0xfff00000) | (7 << 8); 146684e662502a310868da052192b80604234b66711Stephen Smalley 147684e662502a310868da052192b80604234b66711Stephen Smalley if (sehandle) { 148684e662502a310868da052192b80604234b66711Stephen Smalley rc = selabel_lookup(sehandle, &secontext, filename, S_IFBLK); 149684e662502a310868da052192b80604234b66711Stephen Smalley if (rc == 0) 150684e662502a310868da052192b80604234b66711Stephen Smalley setfscreatecon(secontext); 151684e662502a310868da052192b80604234b66711Stephen Smalley } 152684e662502a310868da052192b80604234b66711Stephen Smalley 1538da6bcb006f4e4257cdd685e35e910a6334f6ceaSan Mehat if (mknod(filename, mode, dev) < 0) { 1548da6bcb006f4e4257cdd685e35e910a6334f6ceaSan Mehat if (errno != EEXIST) { 155684e662502a310868da052192b80604234b66711Stephen Smalley int sverrno = errno; 15697ac40e4e6f3ed0bd5d6878d7d8d4a54fcaecb76San Mehat SLOGE("Error creating loop device node (%s)", strerror(errno)); 157684e662502a310868da052192b80604234b66711Stephen Smalley if (secontext) { 158684e662502a310868da052192b80604234b66711Stephen Smalley freecon(secontext); 159684e662502a310868da052192b80604234b66711Stephen Smalley setfscreatecon(NULL); 160684e662502a310868da052192b80604234b66711Stephen Smalley } 161684e662502a310868da052192b80604234b66711Stephen Smalley errno = sverrno; 1628da6bcb006f4e4257cdd685e35e910a6334f6ceaSan Mehat return -1; 1638da6bcb006f4e4257cdd685e35e910a6334f6ceaSan Mehat } 1648da6bcb006f4e4257cdd685e35e910a6334f6ceaSan Mehat } 165684e662502a310868da052192b80604234b66711Stephen Smalley if (secontext) { 166684e662502a310868da052192b80604234b66711Stephen Smalley freecon(secontext); 167684e662502a310868da052192b80604234b66711Stephen Smalley setfscreatecon(NULL); 168684e662502a310868da052192b80604234b66711Stephen Smalley } 1698da6bcb006f4e4257cdd685e35e910a6334f6ceaSan Mehat 170a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat if ((fd = open(filename, O_RDWR)) < 0) { 17197ac40e4e6f3ed0bd5d6878d7d8d4a54fcaecb76San Mehat SLOGE("Unable to open %s (%s)", filename, strerror(errno)); 172a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat return -1; 173a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat } 174a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 1757c16502dbc16658c45165edb1c54df6b8b02d9caKenny Root rc = ioctl(fd, LOOP_GET_STATUS64, &li); 176a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat if (rc < 0 && errno == ENXIO) 177a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat break; 178a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 1798da6bcb006f4e4257cdd685e35e910a6334f6ceaSan Mehat close(fd); 1808da6bcb006f4e4257cdd685e35e910a6334f6ceaSan Mehat 181a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat if (rc < 0) { 18297ac40e4e6f3ed0bd5d6878d7d8d4a54fcaecb76San Mehat SLOGE("Unable to get loop status for %s (%s)", filename, 183a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat strerror(errno)); 184a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat return -1; 185a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat } 186a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat } 187a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 188a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat if (i == LOOP_MAX) { 18997ac40e4e6f3ed0bd5d6878d7d8d4a54fcaecb76San Mehat SLOGE("Exhausted all loop devices"); 190a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat errno = ENOSPC; 191a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat return -1; 192a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat } 193a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 1942152266deb82f96ef5a22d3a56a76bf6177e1e04Henrik Baard strlcpy(loopDeviceBuffer, filename, len); 195a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 1968da6bcb006f4e4257cdd685e35e910a6334f6ceaSan Mehat int file_fd; 197a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 198a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat if ((file_fd = open(loopFile, O_RDWR)) < 0) { 19997ac40e4e6f3ed0bd5d6878d7d8d4a54fcaecb76San Mehat SLOGE("Unable to open %s (%s)", loopFile, strerror(errno)); 200a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat close(fd); 201a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat return -1; 202a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat } 203a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 204a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat if (ioctl(fd, LOOP_SET_FD, file_fd) < 0) { 20597ac40e4e6f3ed0bd5d6878d7d8d4a54fcaecb76San Mehat SLOGE("Error setting up loopback interface (%s)", strerror(errno)); 206a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat close(file_fd); 207a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat close(fd); 208a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat return -1; 209a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat } 210a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 211508c0e1605b795bbb51cb47d955b89f3df26ca94Kenny Root struct loop_info64 li; 212a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 213a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat memset(&li, 0, sizeof(li)); 214092aa1c585fedd9e169eece41b8a471f1739908aPeter Bohm strlcpy((char*) li.lo_crypt_name, id, LO_NAME_SIZE); 215092aa1c585fedd9e169eece41b8a471f1739908aPeter Bohm strlcpy((char*) li.lo_file_name, loopFile, LO_NAME_SIZE); 216a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 217508c0e1605b795bbb51cb47d955b89f3df26ca94Kenny Root if (ioctl(fd, LOOP_SET_STATUS64, &li) < 0) { 21897ac40e4e6f3ed0bd5d6878d7d8d4a54fcaecb76San Mehat SLOGE("Error setting loopback status (%s)", strerror(errno)); 219a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat close(file_fd); 220a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat close(fd); 221a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat return -1; 222a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat } 223a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 224a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat close(fd); 225a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat close(file_fd); 226a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 227a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat return 0; 228a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat} 229a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 230a19b250bd273455933ca3502cf2c2e0a803aff77San Mehatint Loop::destroyByDevice(const char *loopDevice) { 231a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat int device_fd; 232a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 233a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat device_fd = open(loopDevice, O_RDONLY); 234a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat if (device_fd < 0) { 23597ac40e4e6f3ed0bd5d6878d7d8d4a54fcaecb76San Mehat SLOGE("Failed to open loop (%d)", errno); 236a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat return -1; 237a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat } 238a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 239a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat if (ioctl(device_fd, LOOP_CLR_FD, 0) < 0) { 24097ac40e4e6f3ed0bd5d6878d7d8d4a54fcaecb76San Mehat SLOGE("Failed to destroy loop (%d)", errno); 241a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat close(device_fd); 242a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat return -1; 243a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat } 244a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 245a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat close(device_fd); 246a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat return 0; 247a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat} 248a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 2493e971277db0d87652af5622c989233e7159ab909Mark Salyzynint Loop::destroyByFile(const char * /*loopFile*/) { 250a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat errno = ENOSYS; 251a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat return -1; 252a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat} 253a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 2548b8f71b1d760411279f3b07a5c97709f052c689eSan Mehatint Loop::createImageFile(const char *file, unsigned int numSectors) { 255a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat int fd; 256a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 257a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat if ((fd = creat(file, 0600)) < 0) { 25897ac40e4e6f3ed0bd5d6878d7d8d4a54fcaecb76San Mehat SLOGE("Error creating imagefile (%s)", strerror(errno)); 259a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat return -1; 260a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat } 261a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat 2628b8f71b1d760411279f3b07a5c97709f052c689eSan Mehat if (ftruncate(fd, numSectors * 512) < 0) { 26397ac40e4e6f3ed0bd5d6878d7d8d4a54fcaecb76San Mehat SLOGE("Error truncating imagefile (%s)", strerror(errno)); 264a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat close(fd); 265a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat return -1; 266a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat } 267a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat close(fd); 268a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat return 0; 269a19b250bd273455933ca3502cf2c2e0a803aff77San Mehat} 270344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root 271fcd34a0ddd45db83b7bc71ff47cba9b789089fddDaniel Rosenbergint Loop::resizeImageFile(const char *file, unsigned int numSectors) { 272fcd34a0ddd45db83b7bc71ff47cba9b789089fddDaniel Rosenberg int fd; 273fcd34a0ddd45db83b7bc71ff47cba9b789089fddDaniel Rosenberg 274fcd34a0ddd45db83b7bc71ff47cba9b789089fddDaniel Rosenberg if ((fd = open(file, O_RDWR)) < 0) { 275fcd34a0ddd45db83b7bc71ff47cba9b789089fddDaniel Rosenberg SLOGE("Error opening imagefile (%s)", strerror(errno)); 276fcd34a0ddd45db83b7bc71ff47cba9b789089fddDaniel Rosenberg return -1; 277fcd34a0ddd45db83b7bc71ff47cba9b789089fddDaniel Rosenberg } 278fcd34a0ddd45db83b7bc71ff47cba9b789089fddDaniel Rosenberg 279fcd34a0ddd45db83b7bc71ff47cba9b789089fddDaniel Rosenberg SLOGD("Attempting to increase size of %s to %d sectors.", file, numSectors); 280fcd34a0ddd45db83b7bc71ff47cba9b789089fddDaniel Rosenberg 281fcd34a0ddd45db83b7bc71ff47cba9b789089fddDaniel Rosenberg if (fallocate(fd, 0, 0, numSectors * 512)) { 28243ed123d3fc1a3edf3660cd0e2528e971abc399eJeff Sharkey if (errno == ENOSYS || errno == ENOTSUP) { 283fcd34a0ddd45db83b7bc71ff47cba9b789089fddDaniel Rosenberg SLOGW("fallocate not found. Falling back to ftruncate."); 284fcd34a0ddd45db83b7bc71ff47cba9b789089fddDaniel Rosenberg if (ftruncate(fd, numSectors * 512) < 0) { 285fcd34a0ddd45db83b7bc71ff47cba9b789089fddDaniel Rosenberg SLOGE("Error truncating imagefile (%s)", strerror(errno)); 286fcd34a0ddd45db83b7bc71ff47cba9b789089fddDaniel Rosenberg close(fd); 287fcd34a0ddd45db83b7bc71ff47cba9b789089fddDaniel Rosenberg return -1; 288fcd34a0ddd45db83b7bc71ff47cba9b789089fddDaniel Rosenberg } 289fcd34a0ddd45db83b7bc71ff47cba9b789089fddDaniel Rosenberg } else { 290fcd34a0ddd45db83b7bc71ff47cba9b789089fddDaniel Rosenberg SLOGE("Error allocating space (%s)", strerror(errno)); 291fcd34a0ddd45db83b7bc71ff47cba9b789089fddDaniel Rosenberg close(fd); 292fcd34a0ddd45db83b7bc71ff47cba9b789089fddDaniel Rosenberg return -1; 293fcd34a0ddd45db83b7bc71ff47cba9b789089fddDaniel Rosenberg } 294fcd34a0ddd45db83b7bc71ff47cba9b789089fddDaniel Rosenberg } 295fcd34a0ddd45db83b7bc71ff47cba9b789089fddDaniel Rosenberg close(fd); 296fcd34a0ddd45db83b7bc71ff47cba9b789089fddDaniel Rosenberg return 0; 297fcd34a0ddd45db83b7bc71ff47cba9b789089fddDaniel Rosenberg} 298fcd34a0ddd45db83b7bc71ff47cba9b789089fddDaniel Rosenberg 299344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Rootint Loop::lookupInfo(const char *loopDevice, struct asec_superblock *sb, unsigned int *nr_sec) { 300344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root int fd; 301344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root struct asec_superblock buffer; 302344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root 303344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root if ((fd = open(loopDevice, O_RDONLY)) < 0) { 304344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root SLOGE("Failed to open loopdevice (%s)", strerror(errno)); 305344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root destroyByDevice(loopDevice); 306344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root return -1; 307344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root } 308344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root 309344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root if (ioctl(fd, BLKGETSIZE, nr_sec)) { 310344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root SLOGE("Failed to get loop size (%s)", strerror(errno)); 311344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root destroyByDevice(loopDevice); 312344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root close(fd); 313344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root return -1; 314344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root } 315344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root 316344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root /* 317344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root * Try to read superblock. 318344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root */ 319344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root memset(&buffer, 0, sizeof(struct asec_superblock)); 320344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root if (lseek(fd, ((*nr_sec - 1) * 512), SEEK_SET) < 0) { 321344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root SLOGE("lseek failed (%s)", strerror(errno)); 322344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root close(fd); 323344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root destroyByDevice(loopDevice); 324344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root return -1; 325344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root } 326344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root if (read(fd, &buffer, sizeof(struct asec_superblock)) != sizeof(struct asec_superblock)) { 327344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root SLOGE("superblock read failed (%s)", strerror(errno)); 328344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root close(fd); 329344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root destroyByDevice(loopDevice); 330344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root return -1; 331344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root } 332344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root close(fd); 333344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root 334344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root /* 335344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root * Superblock successfully read. Copy to caller's struct. 336344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root */ 337344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root memcpy(sb, &buffer, sizeof(struct asec_superblock)); 338344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root return 0; 339344ca10856f3d3087a3288ce8f91ad83665d93fbKenny Root} 340