1 /*
2 * Copyright (C) 2008 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 <dirent.h>
18 #include <errno.h>
19 #include <fcntl.h>
20 #include <limits.h>
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <string.h>
24 #include <sys/klog.h>
25 #include <sys/reboot.h>
26 #include <sys/stat.h>
27 #include <sys/types.h>
28 #include <time.h>
29
30 #include "private/android_filesystem_config.h"
31
32 // Sentinel file used to track whether we've forced a reboot
33 static const char *kMarkerFile = "/data/misc/check-lost+found-rebooted-2";
34
35 // Output file in tombstones directory (first 8K will be uploaded)
36 static const char *kOutputDir = "/data/tombstones";
37 static const char *kOutputFile = "/data/tombstones/check-lost+found-log";
38
39 // Partitions to check
40 static const char *kPartitions[] = { "/system", "/data", "/cache", NULL };
41
42 /*
43 * 1. If /data/misc/forced-reboot is missing, touch it & force "unclean" boot.
44 * 2. Write a log entry with the number of files in lost+found directories.
45 */
46
main(int argc,char ** argv)47 int main(int argc, char **argv) {
48 mkdir(kOutputDir, 0755);
49 chown(kOutputDir, AID_SYSTEM, AID_SYSTEM);
50 FILE *out = fopen(kOutputFile, "a");
51 if (out == NULL) {
52 fprintf(stderr, "Can't write %s: %s\n", kOutputFile, strerror(errno));
53 return 1;
54 }
55
56 // Note: only the first 8K of log will be uploaded, so be terse.
57 time_t start = time(NULL);
58 fprintf(out, "*** check-lost+found ***\nStarted: %s", ctime(&start));
59
60 struct stat st;
61 if (stat(kMarkerFile, &st)) {
62 // No reboot marker -- need to force an unclean reboot.
63 // But first, try to create the marker file. If that fails,
64 // skip the reboot, so we don't get caught in an infinite loop.
65
66 int fd = open(kMarkerFile, O_WRONLY|O_CREAT, 0444);
67 if (fd >= 0 && close(fd) == 0) {
68 fprintf(out, "Wrote %s, rebooting\n", kMarkerFile);
69 fflush(out);
70 sync(); // Make sure the marker file is committed to disk
71
72 // If possible, dirty each of these partitions before rebooting,
73 // to make sure the filesystem has to do a scan on mount.
74 int i;
75 for (i = 0; kPartitions[i] != NULL; ++i) {
76 char fn[PATH_MAX];
77 snprintf(fn, sizeof(fn), "%s/%s", kPartitions[i], "dirty");
78 fd = open(fn, O_WRONLY|O_CREAT, 0444);
79 if (fd >= 0) { // Don't sweat it if we can't write the file.
80 write(fd, fn, sizeof(fn)); // write, you know, some data
81 close(fd);
82 unlink(fn);
83 }
84 }
85
86 reboot(RB_AUTOBOOT); // reboot immediately, with dirty filesystems
87 fprintf(out, "Reboot failed?!\n");
88 exit(1);
89 } else {
90 fprintf(out, "Can't write %s: %s\n", kMarkerFile, strerror(errno));
91 }
92 } else {
93 fprintf(out, "Found %s\n", kMarkerFile);
94 }
95
96 int i;
97 for (i = 0; kPartitions[i] != NULL; ++i) {
98 char fn[PATH_MAX];
99 snprintf(fn, sizeof(fn), "%s/%s", kPartitions[i], "lost+found");
100 DIR *dir = opendir(fn);
101 if (dir == NULL) {
102 fprintf(out, "Can't open %s: %s\n", fn, strerror(errno));
103 } else {
104 int count = 0;
105 struct dirent *ent;
106 while ((ent = readdir(dir))) {
107 if (strcmp(ent->d_name, ".") && strcmp(ent->d_name, ".."))
108 ++count;
109 }
110 closedir(dir);
111 if (count > 0) {
112 fprintf(out, "OMGZ FOUND %d FILES IN %s\n", count, fn);
113 } else {
114 fprintf(out, "%s is clean\n", fn);
115 }
116 }
117 }
118
119 char dmesg[131073];
120 int len = klogctl(KLOG_READ_ALL, dmesg, sizeof(dmesg) - 1);
121 if (len < 0) {
122 fprintf(out, "Can't read kernel log: %s\n", strerror(errno));
123 } else { // To conserve space, only write lines with certain keywords
124 fprintf(out, "--- Kernel log ---\n");
125 dmesg[len] = '\0';
126 char *saveptr, *line;
127 int in_yaffs = 0;
128 for (line = strtok_r(dmesg, "\n", &saveptr); line != NULL;
129 line = strtok_r(NULL, "\n", &saveptr)) {
130 if (strstr(line, "yaffs: dev is")) in_yaffs = 1;
131
132 if (in_yaffs ||
133 strstr(line, "yaffs") ||
134 strstr(line, "mtd") ||
135 strstr(line, "msm_nand")) {
136 fprintf(out, "%s\n", line);
137 }
138
139 if (strstr(line, "yaffs_read_super: isCheckpointed")) in_yaffs = 0;
140 }
141 }
142
143 return 0;
144 }
145