/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/klog.h>
#include <sys/reboot.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <time.h>
#include <unistd.h>
#include "private/android_filesystem_config.h"
// Sentinel file used to track whether we've forced a reboot
static const char *kMarkerFile = "/data/misc/check-lost+found-rebooted-2";
// Output file in tombstones directory (first 8K will be uploaded)
static const char *kOutputDir = "/data/tombstones";
static const char *kOutputFile = "/data/tombstones/check-lost+found-log";
// Partitions to check
static const char *kPartitions[] = { "/system", "/data", "/cache", NULL };
/*
* 1. If /data/misc/forced-reboot is missing, touch it & force "unclean" boot.
* 2. Write a log entry with the number of files in lost+found directories.
*/
int main(int argc __attribute__((unused)), char **argv __attribute__((unused))) {
mkdir(kOutputDir, 0755);
chown(kOutputDir, AID_SYSTEM, AID_SYSTEM);
FILE *out = fopen(kOutputFile, "a");
if (out == NULL) {
fprintf(stderr, "Can't write %s: %s\n", kOutputFile, strerror(errno));
return 1;
}
// Note: only the first 8K of log will be uploaded, so be terse.
time_t start = time(NULL);
fprintf(out, "*** check-lost+found ***\nStarted: %s", ctime(&start));
struct stat st;
if (stat(kMarkerFile, &st)) {
// No reboot marker -- need to force an unclean reboot.
// But first, try to create the marker file. If that fails,
// skip the reboot, so we don't get caught in an infinite loop.
int fd = open(kMarkerFile, O_WRONLY|O_CREAT, 0444);
if (fd >= 0 && close(fd) == 0) {
fprintf(out, "Wrote %s, rebooting\n", kMarkerFile);
fflush(out);
sync(); // Make sure the marker file is committed to disk
// If possible, dirty each of these partitions before rebooting,
// to make sure the filesystem has to do a scan on mount.
int i;
for (i = 0; kPartitions[i] != NULL; ++i) {
char fn[PATH_MAX];
snprintf(fn, sizeof(fn), "%s/%s", kPartitions[i], "dirty");
fd = open(fn, O_WRONLY|O_CREAT, 0444);
if (fd >= 0) { // Don't sweat it if we can't write the file.
TEMP_FAILURE_RETRY(write(fd, fn, sizeof(fn))); // write, you know, some data
close(fd);
unlink(fn);
}
}
reboot(RB_AUTOBOOT); // reboot immediately, with dirty filesystems
fprintf(out, "Reboot failed?!\n");
exit(1);
} else {
fprintf(out, "Can't write %s: %s\n", kMarkerFile, strerror(errno));
}
} else {
fprintf(out, "Found %s\n", kMarkerFile);
}
int i;
for (i = 0; kPartitions[i] != NULL; ++i) {
char fn[PATH_MAX];
snprintf(fn, sizeof(fn), "%s/%s", kPartitions[i], "lost+found");
DIR *dir = opendir(fn);
if (dir == NULL) {
fprintf(out, "Can't open %s: %s\n", fn, strerror(errno));
} else {
int count = 0;
struct dirent *ent;
while ((ent = readdir(dir))) {
if (strcmp(ent->d_name, ".") && strcmp(ent->d_name, ".."))
++count;
}
closedir(dir);
if (count > 0) {
fprintf(out, "OMGZ FOUND %d FILES IN %s\n", count, fn);
} else {
fprintf(out, "%s is clean\n", fn);
}
}
}
char dmesg[131073];
int len = klogctl(KLOG_READ_ALL, dmesg, sizeof(dmesg) - 1);
if (len < 0) {
fprintf(out, "Can't read kernel log: %s\n", strerror(errno));
} else { // To conserve space, only write lines with certain keywords
fprintf(out, "--- Kernel log ---\n");
dmesg[len] = '\0';
char *saveptr, *line;
int in_yaffs = 0;
for (line = strtok_r(dmesg, "\n", &saveptr); line != NULL;
line = strtok_r(NULL, "\n", &saveptr)) {
if (strstr(line, "yaffs: dev is")) in_yaffs = 1;
if (in_yaffs ||
strstr(line, "yaffs") ||
strstr(line, "mtd") ||
strstr(line, "msm_nand")) {
fprintf(out, "%s\n", line);
}
if (strstr(line, "yaffs_read_super: isCheckpointed")) in_yaffs = 0;
}
}
return 0;
}
