remount_service.c revision dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0
1dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project/* 2dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * Copyright (C) 2008 The Android Open Source Project 3dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * 4dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * Licensed under the Apache License, Version 2.0 (the "License"); 5dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * you may not use this file except in compliance with the License. 6dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * You may obtain a copy of the License at 7dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * 8dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 9dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * 10dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * Unless required by applicable law or agreed to in writing, software 11dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * distributed under the License is distributed on an "AS IS" BASIS, 12dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * See the License for the specific language governing permissions and 14dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * limitations under the License. 15dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project */ 16dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 17dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <stdlib.h> 18dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <stdio.h> 19dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <unistd.h> 20dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <string.h> 21dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <fcntl.h> 22dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <sys/mount.h> 23dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <errno.h> 24dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 25dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include "sysdeps.h" 26dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 27dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#define TRACE_TAG TRACE_ADB 28dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include "adb.h" 29dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 30dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 31dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectstatic int system_ro = 1; 32dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 33dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project/* Returns the mount number of the requested partition from /proc/mtd */ 34dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectstatic int find_mount(const char *findme) 35dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project{ 36dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project int fd; 37dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project int res; 38dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project int size; 39dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project char *token = NULL; 40dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project const char delims[] = "\n"; 41dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project char buf[1024]; 42dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 43dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project fd = unix_open("/proc/mtd", O_RDONLY); 44dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if (fd < 0) 45dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project return -errno; 46dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 47dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project buf[sizeof(buf) - 1] = '\0'; 48dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project size = adb_read(fd, buf, sizeof(buf) - 1); 49dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project adb_close(fd); 50dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 51dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project token = strtok(buf, delims); 52dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 53dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project while (token) { 54dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project char mtdname[16]; 55dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project int mtdnum, mtdsize, mtderasesize; 56dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 57dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project res = sscanf(token, "mtd%d: %x %x %15s", 58dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project &mtdnum, &mtdsize, &mtderasesize, mtdname); 59dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 60dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if (res == 4 && !strcmp(mtdname, findme)) 61dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project return mtdnum; 62dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 63dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project token = strtok(NULL, delims); 64dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } 65dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project return -1; 66dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project} 67dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 68dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project/* Init mounts /system as read only, remount to enable writes. */ 69dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectstatic int remount_system() 70dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project{ 71dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project int num; 72dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project char source[64]; 73dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if (system_ro == 0) { 74dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project return 0; 75dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } 76dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if ((num = find_mount("\"system\"")) < 0) 77dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project return -1; 78dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 79dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project snprintf(source, sizeof source, "/dev/block/mtdblock%d", num); 80dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project system_ro = mount(source, "/system", "yaffs2", MS_REMOUNT, NULL); 81dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project return system_ro; 82dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project} 83dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 84dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectstatic void write_string(int fd, const char* str) 85dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project{ 86dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project writex(fd, str, strlen(str)); 87dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project} 88dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 89dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectvoid remount_service(int fd, void *cookie) 90dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project{ 91dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project int ret = remount_system(); 92dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 93dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if (!ret) 94dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project write_string(fd, "remount succeeded\n"); 95dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project else { 96dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project char buffer[200]; 97dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project snprintf(buffer, sizeof(buffer), "remount failed: %s\n", strerror(errno)); 98dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project write_string(fd, buffer); 99dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } 100dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 101dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project adb_close(fd); 102dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project} 103dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 104