1 /* 2 * Copyright (C) 2007 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include <errno.h> 18 #include <stdlib.h> 19 #include <sys/mount.h> 20 #include <sys/stat.h> 21 #include <sys/types.h> 22 #include <unistd.h> 23 #include <ctype.h> 24 25 #include "mtdutils/mtdutils.h" 26 #include "mtdutils/mounts.h" 27 #include "roots.h" 28 #include "common.h" 29 #include "make_ext4fs.h" 30 31 static int num_volumes = 0; 32 static Volume* device_volumes = NULL; 33 34 extern struct selabel_handle *sehandle; 35 36 static int parse_options(char* options, Volume* volume) { 37 char* option; 38 while ((option = strtok(options, ","))) { 39 options = NULL; 40 41 if (strncmp(option, "length=", 7) == 0) { 42 volume->length = strtoll(option+7, NULL, 10); 43 } else { 44 LOGE("bad option \"%s\"\n", option); 45 return -1; 46 } 47 } 48 return 0; 49 } 50 51 void load_volume_table() { 52 int alloc = 2; 53 device_volumes = (Volume*)malloc(alloc * sizeof(Volume)); 54 55 // Insert an entry for /tmp, which is the ramdisk and is always mounted. 56 device_volumes[0].mount_point = "/tmp"; 57 device_volumes[0].fs_type = "ramdisk"; 58 device_volumes[0].device = NULL; 59 device_volumes[0].device2 = NULL; 60 device_volumes[0].length = 0; 61 num_volumes = 1; 62 63 FILE* fstab = fopen("/etc/recovery.fstab", "r"); 64 if (fstab == NULL) { 65 LOGE("failed to open /etc/recovery.fstab (%s)\n", strerror(errno)); 66 return; 67 } 68 69 char buffer[1024]; 70 int i; 71 while (fgets(buffer, sizeof(buffer)-1, fstab)) { 72 for (i = 0; buffer[i] && isspace(buffer[i]); ++i); 73 if (buffer[i] == '\0' || buffer[i] == '#') continue; 74 75 char* original = strdup(buffer); 76 77 char* mount_point = strtok(buffer+i, " \t\n"); 78 char* fs_type = strtok(NULL, " \t\n"); 79 char* device = strtok(NULL, " \t\n"); 80 // lines may optionally have a second device, to use if 81 // mounting the first one fails. 82 char* options = NULL; 83 char* device2 = strtok(NULL, " \t\n"); 84 if (device2) { 85 if (device2[0] == '/') { 86 options = strtok(NULL, " \t\n"); 87 } else { 88 options = device2; 89 device2 = NULL; 90 } 91 } 92 93 if (mount_point && fs_type && device) { 94 while (num_volumes >= alloc) { 95 alloc *= 2; 96 device_volumes = (Volume*)realloc(device_volumes, alloc*sizeof(Volume)); 97 } 98 device_volumes[num_volumes].mount_point = strdup(mount_point); 99 device_volumes[num_volumes].fs_type = strdup(fs_type); 100 device_volumes[num_volumes].device = strdup(device); 101 device_volumes[num_volumes].device2 = 102 device2 ? strdup(device2) : NULL; 103 104 device_volumes[num_volumes].length = 0; 105 if (parse_options(options, device_volumes + num_volumes) != 0) { 106 LOGE("skipping malformed recovery.fstab line: %s\n", original); 107 } else { 108 ++num_volumes; 109 } 110 } else { 111 LOGE("skipping malformed recovery.fstab line: %s\n", original); 112 } 113 free(original); 114 } 115 116 fclose(fstab); 117 118 printf("recovery filesystem table\n"); 119 printf("=========================\n"); 120 for (i = 0; i < num_volumes; ++i) { 121 Volume* v = &device_volumes[i]; 122 printf(" %d %s %s %s %s %lld\n", i, v->mount_point, v->fs_type, 123 v->device, v->device2, v->length); 124 } 125 printf("\n"); 126 } 127 128 Volume* volume_for_path(const char* path) { 129 int i; 130 for (i = 0; i < num_volumes; ++i) { 131 Volume* v = device_volumes+i; 132 int len = strlen(v->mount_point); 133 if (strncmp(path, v->mount_point, len) == 0 && 134 (path[len] == '\0' || path[len] == '/')) { 135 return v; 136 } 137 } 138 return NULL; 139 } 140 141 int ensure_path_mounted(const char* path) { 142 Volume* v = volume_for_path(path); 143 if (v == NULL) { 144 LOGE("unknown volume for path [%s]\n", path); 145 return -1; 146 } 147 if (strcmp(v->fs_type, "ramdisk") == 0) { 148 // the ramdisk is always mounted. 149 return 0; 150 } 151 152 int result; 153 result = scan_mounted_volumes(); 154 if (result < 0) { 155 LOGE("failed to scan mounted volumes\n"); 156 return -1; 157 } 158 159 const MountedVolume* mv = 160 find_mounted_volume_by_mount_point(v->mount_point); 161 if (mv) { 162 // volume is already mounted 163 return 0; 164 } 165 166 mkdir(v->mount_point, 0755); // in case it doesn't already exist 167 168 if (strcmp(v->fs_type, "yaffs2") == 0) { 169 // mount an MTD partition as a YAFFS2 filesystem. 170 mtd_scan_partitions(); 171 const MtdPartition* partition; 172 partition = mtd_find_partition_by_name(v->device); 173 if (partition == NULL) { 174 LOGE("failed to find \"%s\" partition to mount at \"%s\"\n", 175 v->device, v->mount_point); 176 return -1; 177 } 178 return mtd_mount_partition(partition, v->mount_point, v->fs_type, 0); 179 } else if (strcmp(v->fs_type, "ext4") == 0 || 180 strcmp(v->fs_type, "vfat") == 0) { 181 result = mount(v->device, v->mount_point, v->fs_type, 182 MS_NOATIME | MS_NODEV | MS_NODIRATIME, ""); 183 if (result == 0) return 0; 184 185 if (v->device2) { 186 LOGW("failed to mount %s (%s); trying %s\n", 187 v->device, strerror(errno), v->device2); 188 result = mount(v->device2, v->mount_point, v->fs_type, 189 MS_NOATIME | MS_NODEV | MS_NODIRATIME, ""); 190 if (result == 0) return 0; 191 } 192 193 LOGE("failed to mount %s (%s)\n", v->mount_point, strerror(errno)); 194 return -1; 195 } 196 197 LOGE("unknown fs_type \"%s\" for %s\n", v->fs_type, v->mount_point); 198 return -1; 199 } 200 201 int ensure_path_unmounted(const char* path) { 202 Volume* v = volume_for_path(path); 203 if (v == NULL) { 204 LOGE("unknown volume for path [%s]\n", path); 205 return -1; 206 } 207 if (strcmp(v->fs_type, "ramdisk") == 0) { 208 // the ramdisk is always mounted; you can't unmount it. 209 return -1; 210 } 211 212 int result; 213 result = scan_mounted_volumes(); 214 if (result < 0) { 215 LOGE("failed to scan mounted volumes\n"); 216 return -1; 217 } 218 219 const MountedVolume* mv = 220 find_mounted_volume_by_mount_point(v->mount_point); 221 if (mv == NULL) { 222 // volume is already unmounted 223 return 0; 224 } 225 226 return unmount_mounted_volume(mv); 227 } 228 229 int format_volume(const char* volume) { 230 Volume* v = volume_for_path(volume); 231 if (v == NULL) { 232 LOGE("unknown volume \"%s\"\n", volume); 233 return -1; 234 } 235 if (strcmp(v->fs_type, "ramdisk") == 0) { 236 // you can't format the ramdisk. 237 LOGE("can't format_volume \"%s\"", volume); 238 return -1; 239 } 240 if (strcmp(v->mount_point, volume) != 0) { 241 LOGE("can't give path \"%s\" to format_volume\n", volume); 242 return -1; 243 } 244 245 if (ensure_path_unmounted(volume) != 0) { 246 LOGE("format_volume failed to unmount \"%s\"\n", v->mount_point); 247 return -1; 248 } 249 250 if (strcmp(v->fs_type, "yaffs2") == 0 || strcmp(v->fs_type, "mtd") == 0) { 251 mtd_scan_partitions(); 252 const MtdPartition* partition = mtd_find_partition_by_name(v->device); 253 if (partition == NULL) { 254 LOGE("format_volume: no MTD partition \"%s\"\n", v->device); 255 return -1; 256 } 257 258 MtdWriteContext *write = mtd_write_partition(partition); 259 if (write == NULL) { 260 LOGW("format_volume: can't open MTD \"%s\"\n", v->device); 261 return -1; 262 } else if (mtd_erase_blocks(write, -1) == (off_t) -1) { 263 LOGW("format_volume: can't erase MTD \"%s\"\n", v->device); 264 mtd_write_close(write); 265 return -1; 266 } else if (mtd_write_close(write)) { 267 LOGW("format_volume: can't close MTD \"%s\"\n", v->device); 268 return -1; 269 } 270 return 0; 271 } 272 273 if (strcmp(v->fs_type, "ext4") == 0) { 274 int result = make_ext4fs(v->device, v->length, volume, sehandle); 275 if (result != 0) { 276 LOGE("format_volume: make_extf4fs failed on %s\n", v->device); 277 return -1; 278 } 279 return 0; 280 } 281 282 LOGE("format_volume: fs_type \"%s\" unsupported\n", v->fs_type); 283 return -1; 284 } 285
