264 lines
8.1 KiB
C
264 lines
8.1 KiB
C
/*
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* Copyright (C) 2007 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <errno.h>
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#include <stdlib.h>
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#include <sys/mount.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <ctype.h>
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#include "mtdutils/mtdutils.h"
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#include "mounts.h"
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#include "roots.h"
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#include "common.h"
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#include "make_ext4fs.h"
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static int num_volumes = 0;
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static Volume* device_volumes = NULL;
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void load_volume_table() {
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int alloc = 2;
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device_volumes = malloc(alloc * sizeof(Volume));
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// Insert an entry for /tmp, which is the ramdisk and is always mounted.
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device_volumes[0].mount_point = "/tmp";
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device_volumes[0].fs_type = "ramdisk";
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device_volumes[0].device = NULL;
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device_volumes[0].device2 = NULL;
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num_volumes = 1;
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FILE* fstab = fopen("/etc/recovery.fstab", "r");
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if (fstab == NULL) {
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LOGE("failed to open /etc/recovery.fstab (%s)\n", strerror(errno));
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return;
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}
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char buffer[1024];
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int i;
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while (fgets(buffer, sizeof(buffer)-1, fstab)) {
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for (i = 0; buffer[i] && isspace(buffer[i]); ++i);
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if (buffer[i] == '\0' || buffer[i] == '#') continue;
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char* original = strdup(buffer);
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char* mount_point = strtok(buffer+i, " \t\n");
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char* fs_type = strtok(NULL, " \t\n");
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char* device = strtok(NULL, " \t\n");
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// lines may optionally have a second device, to use if
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// mounting the first one fails.
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char* device2 = strtok(NULL, " \t\n");
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if (mount_point && fs_type && device) {
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while (num_volumes >= alloc) {
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alloc *= 2;
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device_volumes = realloc(device_volumes, alloc*sizeof(Volume));
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}
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device_volumes[num_volumes].mount_point = strdup(mount_point);
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device_volumes[num_volumes].fs_type = strdup(fs_type);
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device_volumes[num_volumes].device = strdup(device);
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device_volumes[num_volumes].device2 =
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device2 ? strdup(device2) : NULL;
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++num_volumes;
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} else {
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LOGE("skipping malformed recovery.fstab line: %s\n", original);
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}
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free(original);
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}
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fclose(fstab);
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printf("recovery filesystem table\n");
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printf("=========================\n");
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for (i = 0; i < num_volumes; ++i) {
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Volume* v = &device_volumes[i];
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printf(" %d %s %s %s %s\n", i, v->mount_point, v->fs_type,
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v->device, v->device2);
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}
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printf("\n");
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}
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Volume* volume_for_path(const char* path) {
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int i;
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for (i = 0; i < num_volumes; ++i) {
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Volume* v = device_volumes+i;
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int len = strlen(v->mount_point);
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if (strncmp(path, v->mount_point, len) == 0 &&
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(path[len] == '\0' || path[len] == '/')) {
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return v;
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}
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}
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return NULL;
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}
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int ensure_path_mounted(const char* path) {
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Volume* v = volume_for_path(path);
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if (v == NULL) {
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LOGE("unknown volume for path [%s]\n", path);
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return -1;
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}
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if (strcmp(v->fs_type, "ramdisk") == 0) {
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// the ramdisk is always mounted.
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return 0;
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}
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int result;
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result = scan_mounted_volumes();
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if (result < 0) {
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LOGE("failed to scan mounted volumes\n");
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return -1;
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}
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const MountedVolume* mv =
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find_mounted_volume_by_mount_point(v->mount_point);
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if (mv) {
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// volume is already mounted
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return 0;
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}
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mkdir(v->mount_point, 0755); // in case it doesn't already exist
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if (strcmp(v->fs_type, "yaffs2") == 0) {
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// mount an MTD partition as a YAFFS2 filesystem.
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mtd_scan_partitions();
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const MtdPartition* partition;
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partition = mtd_find_partition_by_name(v->device);
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if (partition == NULL) {
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LOGE("failed to find \"%s\" partition to mount at \"%s\"\n",
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v->device, v->mount_point);
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return -1;
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}
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return mtd_mount_partition(partition, v->mount_point, v->fs_type, 0);
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} else if (strcmp(v->fs_type, "ext4") == 0 ||
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strcmp(v->fs_type, "vfat") == 0) {
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result = mount(v->device, v->mount_point, v->fs_type,
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MS_NOATIME | MS_NODEV | MS_NODIRATIME, "");
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if (result == 0) return 0;
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if (v->device2) {
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LOGW("failed to mount %s (%s); trying %s\n",
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v->device, strerror(errno), v->device2);
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result = mount(v->device2, v->mount_point, v->fs_type,
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MS_NOATIME | MS_NODEV | MS_NODIRATIME, "");
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if (result == 0) return 0;
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}
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LOGE("failed to mount %s (%s)\n", v->mount_point, strerror(errno));
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return -1;
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} else {
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// let's try mounting with the mount binary and hope for the best.
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char mount_cmd[PATH_MAX];
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sprintf(mount_cmd, "mount %s", path);
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return __system(mount_cmd);
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}
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LOGE("unknown fs_type \"%s\" for %s\n", v->fs_type, v->mount_point);
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return -1;
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}
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int ensure_path_unmounted(const char* path) {
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Volume* v = volume_for_path(path);
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if (v == NULL) {
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LOGE("unknown volume for path [%s]\n", path);
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return -1;
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}
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if (strcmp(v->fs_type, "ramdisk") == 0) {
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// the ramdisk is always mounted; you can't unmount it.
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return -1;
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}
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int result;
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result = scan_mounted_volumes();
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if (result < 0) {
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LOGE("failed to scan mounted volumes\n");
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return -1;
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}
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const MountedVolume* mv =
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find_mounted_volume_by_mount_point(v->mount_point);
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if (mv == NULL) {
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// volume is already unmounted
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return 0;
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}
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return unmount_mounted_volume(mv);
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}
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int format_volume(const char* volume) {
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Volume* v = volume_for_path(volume);
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if (v == NULL) {
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// silent failure for sd-ext
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if (strcmp(volume, "/sd-ext") == 0)
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return -1;
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LOGE("unknown volume \"%s\"\n", volume);
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return -1;
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}
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if (strcmp(v->fs_type, "ramdisk") == 0) {
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// you can't format the ramdisk.
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LOGE("can't format_volume \"%s\"", volume);
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return -1;
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}
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if (strcmp(v->mount_point, volume) != 0) {
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LOGE("can't give path \"%s\" to format_volume\n", volume);
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return -1;
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}
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if (ensure_path_unmounted(volume) != 0) {
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LOGE("format_volume failed to unmount \"%s\"\n", v->mount_point);
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return -1;
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}
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if (strcmp(v->fs_type, "yaffs2") == 0 || strcmp(v->fs_type, "mtd") == 0) {
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mtd_scan_partitions();
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const MtdPartition* partition = mtd_find_partition_by_name(v->device);
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if (partition == NULL) {
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LOGE("format_volume: no MTD partition \"%s\"\n", v->device);
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return -1;
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}
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MtdWriteContext *write = mtd_write_partition(partition);
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if (write == NULL) {
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LOGW("format_volume: can't open MTD \"%s\"\n", v->device);
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return -1;
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} else if (mtd_erase_blocks(write, -1) == (off_t) -1) {
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LOGW("format_volume: can't erase MTD \"%s\"\n", v->device);
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mtd_write_close(write);
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return -1;
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} else if (mtd_write_close(write)) {
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LOGW("format_volume: can't close MTD \"%s\"\n", v->device);
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return -1;
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}
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return 0;
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}
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if (strcmp(v->fs_type, "ext4") == 0) {
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reset_ext4fs_info();
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int result = make_ext4fs(v->device, NULL, NULL, 0, 0, 0);
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if (result != 0) {
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LOGE("format_volume: make_extf4fs failed on %s\n", v->device);
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return -1;
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}
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return 0;
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}
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#if 0
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LOGE("format_volume: fs_type \"%s\" unsupported\n", v->fs_type);
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return -1;
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#endif
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return format_unknown_device(v->device, volume, v->fs_type);
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}
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