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 <fs_mgr.h> 26 #include "mtdutils/mtdutils.h" 27 #include "mtdutils/mounts.h" 28 #include "roots.h" 29 #include "common.h" 30 #include "make_ext4fs.h" 31 32 static struct fstab *fstab = NULL; 33 34 extern struct selabel_handle *sehandle; 35 36 void load_volume_table() 37 { 38 int i; 39 int ret; 40 41 fstab = fs_mgr_read_fstab("/etc/recovery.fstab"); 42 if (!fstab) { 43 LOGE("failed to read /etc/recovery.fstab\n"); 44 return; 45 } 46 47 ret = fs_mgr_add_entry(fstab, "/tmp", "ramdisk", "ramdisk", 0); 48 if (ret < 0 ) { 49 LOGE("failed to add /tmp entry to fstab\n"); 50 fs_mgr_free_fstab(fstab); 51 fstab = NULL; 52 return; 53 } 54 55 printf("recovery filesystem table\n"); 56 printf("=========================\n"); 57 for (i = 0; i < fstab->num_entries; ++i) { 58 Volume* v = &fstab->recs[i]; 59 printf(" %d %s %s %s %lld\n", i, v->mount_point, v->fs_type, 60 v->blk_device, v->length); 61 } 62 printf("\n"); 63 } 64 65 Volume* volume_for_path(const char* path) { 66 return fs_mgr_get_entry_for_mount_point(fstab, path); 67 } 68 69 int ensure_path_mounted(const char* path) { 70 Volume* v = volume_for_path(path); 71 if (v == NULL) { 72 LOGE("unknown volume for path [%s]\n", path); 73 return -1; 74 } 75 if (strcmp(v->fs_type, "ramdisk") == 0) { 76 // the ramdisk is always mounted. 77 return 0; 78 } 79 80 int result; 81 result = scan_mounted_volumes(); 82 if (result < 0) { 83 LOGE("failed to scan mounted volumes\n"); 84 return -1; 85 } 86 87 const MountedVolume* mv = 88 find_mounted_volume_by_mount_point(v->mount_point); 89 if (mv) { 90 // volume is already mounted 91 return 0; 92 } 93 94 mkdir(v->mount_point, 0755); // in case it doesn't already exist 95 96 if (strcmp(v->fs_type, "yaffs2") == 0) { 97 // mount an MTD partition as a YAFFS2 filesystem. 98 mtd_scan_partitions(); 99 const MtdPartition* partition; 100 partition = mtd_find_partition_by_name(v->blk_device); 101 if (partition == NULL) { 102 LOGE("failed to find \"%s\" partition to mount at \"%s\"\n", 103 v->blk_device, v->mount_point); 104 return -1; 105 } 106 return mtd_mount_partition(partition, v->mount_point, v->fs_type, 0); 107 } else if (strcmp(v->fs_type, "ext4") == 0 || 108 strcmp(v->fs_type, "vfat") == 0) { 109 result = mount(v->blk_device, v->mount_point, v->fs_type, 110 MS_NOATIME | MS_NODEV | MS_NODIRATIME, ""); 111 if (result == 0) return 0; 112 113 LOGE("failed to mount %s (%s)\n", v->mount_point, strerror(errno)); 114 return -1; 115 } 116 117 LOGE("unknown fs_type \"%s\" for %s\n", v->fs_type, v->mount_point); 118 return -1; 119 } 120 121 int ensure_path_unmounted(const char* path) { 122 Volume* v = volume_for_path(path); 123 if (v == NULL) { 124 LOGE("unknown volume for path [%s]\n", path); 125 return -1; 126 } 127 if (strcmp(v->fs_type, "ramdisk") == 0) { 128 // the ramdisk is always mounted; you can't unmount it. 129 return -1; 130 } 131 132 int result; 133 result = scan_mounted_volumes(); 134 if (result < 0) { 135 LOGE("failed to scan mounted volumes\n"); 136 return -1; 137 } 138 139 const MountedVolume* mv = 140 find_mounted_volume_by_mount_point(v->mount_point); 141 if (mv == NULL) { 142 // volume is already unmounted 143 return 0; 144 } 145 146 return unmount_mounted_volume(mv); 147 } 148 149 int format_volume(const char* volume) { 150 Volume* v = volume_for_path(volume); 151 if (v == NULL) { 152 LOGE("unknown volume \"%s\"\n", volume); 153 return -1; 154 } 155 if (strcmp(v->fs_type, "ramdisk") == 0) { 156 // you can't format the ramdisk. 157 LOGE("can't format_volume \"%s\"", volume); 158 return -1; 159 } 160 if (strcmp(v->mount_point, volume) != 0) { 161 LOGE("can't give path \"%s\" to format_volume\n", volume); 162 return -1; 163 } 164 165 if (ensure_path_unmounted(volume) != 0) { 166 LOGE("format_volume failed to unmount \"%s\"\n", v->mount_point); 167 return -1; 168 } 169 170 if (strcmp(v->fs_type, "yaffs2") == 0 || strcmp(v->fs_type, "mtd") == 0) { 171 mtd_scan_partitions(); 172 const MtdPartition* partition = mtd_find_partition_by_name(v->blk_device); 173 if (partition == NULL) { 174 LOGE("format_volume: no MTD partition \"%s\"\n", v->blk_device); 175 return -1; 176 } 177 178 MtdWriteContext *write = mtd_write_partition(partition); 179 if (write == NULL) { 180 LOGW("format_volume: can't open MTD \"%s\"\n", v->blk_device); 181 return -1; 182 } else if (mtd_erase_blocks(write, -1) == (off_t) -1) { 183 LOGW("format_volume: can't erase MTD \"%s\"\n", v->blk_device); 184 mtd_write_close(write); 185 return -1; 186 } else if (mtd_write_close(write)) { 187 LOGW("format_volume: can't close MTD \"%s\"\n", v->blk_device); 188 return -1; 189 } 190 return 0; 191 } 192 193 if (strcmp(v->fs_type, "ext4") == 0) { 194 int result = make_ext4fs(v->blk_device, v->length, volume, sehandle); 195 if (result != 0) { 196 LOGE("format_volume: make_extf4fs failed on %s\n", v->blk_device); 197 return -1; 198 } 199 return 0; 200 } 201 202 LOGE("format_volume: fs_type \"%s\" unsupported\n", v->fs_type); 203 return -1; 204 } 205 206 int setup_install_mounts() { 207 if (fstab == NULL) { 208 LOGE("can't set up install mounts: no fstab loaded\n"); 209 return -1; 210 } 211 for (int i = 0; i < fstab->num_entries; ++i) { 212 Volume* v = fstab->recs + i; 213 214 if (strcmp(v->mount_point, "/tmp") == 0 || 215 strcmp(v->mount_point, "/cache") == 0) { 216 if (ensure_path_mounted(v->mount_point) != 0) return -1; 217 218 } else { 219 if (ensure_path_unmounted(v->mount_point) != 0) return -1; 220 } 221 } 222 return 0; 223 } 224
