2 * Copyright (C) 2014 The Android Open Source Project
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
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless requied 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.
19 * These file system recovery tests ensure the ability to recover from
20 * filesystem crashes in key blocks (e.g. superblock).
26 #include <gtest/gtest.h>
27 #include <logwrap/logwrap.h>
28 #include <sys/types.h>
31 #include "cutils/properties.h"
33 #include "ext4_utils.h"
35 #define LOG_TAG "fsRecoveryTest"
36 #include <utils/Log.h>
39 #define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
40 #define FSTAB_PREFIX "/fstab."
41 #define SB_OFFSET 1024
42 #define UMOUNT_BIN "/system/bin/umount"
43 #define VDC_BIN "/system/bin/vdc"
45 enum Fs_Type { FS_UNKNOWN, FS_EXT4, FS_F2FS };
49 class DataFileVerifier {
51 DataFileVerifier(const char* file_name) {
52 strncpy(test_file_, file_name, FILENAME_MAX);
56 int write_fd = open(test_file_, O_CREAT | O_WRONLY, 0666);
57 ASSERT_TRUE(write_fd);
58 ASSERT_EQ(write(write_fd, "TEST", 4), 4);
64 int read_fd = open(test_file_, O_RDONLY);
66 ASSERT_EQ(read(read_fd, read_buff, sizeof(read_buff)), 4);
67 ASSERT_FALSE(strncmp(read_buff, "TEST", 4));
76 char test_file_[FILENAME_MAX];
80 bool getSuperBlock(const int blk_fd, struct ext4_super_block* sb) {
81 if (lseek(blk_fd, SB_OFFSET, SEEK_SET) == -1) {
82 testPrintE("Cannot lseek to ext4 superblock to read");
86 if (read(blk_fd, sb, sizeof(*sb)) != sizeof(*sb)) {
87 testPrintE("Cannot read ext4 superblock");
91 if (sb->s_magic != 0xEF53) {
92 testPrintE("Invalid ext4 superblock magic");
99 bool setSbErrorBit(const int blk_fd) {
101 struct ext4_super_block sb;
102 if (!getSuperBlock(blk_fd, &sb)) {
106 // Check that the detected errors bit is not set.
107 if (sb.s_state & 0x2) {
108 testPrintE("Ext4 superblock already corrupted");
112 // Set the detected errors bit.
116 if (lseek(blk_fd, SB_OFFSET, SEEK_SET) == -1) {
117 testPrintE("Cannot lseek to superblock to write\n");
121 if (write(blk_fd, &sb, sizeof(sb)) != sizeof(sb)) {
122 testPrintE("Cannot write superblock\n");
129 bool corruptGdtFreeBlock(const int blk_fd) {
131 struct ext4_super_block sb;
132 if (!getSuperBlock(blk_fd, &sb)) {
135 // Make sure the block size is 2K or 4K.
136 if ((sb.s_log_block_size != 1) && (sb.s_log_block_size != 2)) {
137 testPrintE("Ext4 block size not 2K or 4K\n");
140 int block_size = 1 << (10 + sb.s_log_block_size);
141 int num_bgs = DIV_ROUND_UP(sb.s_blocks_count_lo, sb.s_blocks_per_group);
143 if (sb.s_desc_size != sizeof(struct ext2_group_desc)) {
144 testPrintE("Can't handle ext4 block group descriptor size of %d",
149 // Read first block group descriptor, decrement free block count, and
150 // write it back out.
151 if (lseek(blk_fd, block_size, SEEK_SET) == -1) {
152 testPrintE("Cannot lseek to ext4 block group descriptor table to read");
156 // Read in block group descriptors till we read one that has at least one free
158 struct ext2_group_desc gd;
159 for (int i = 0; i < num_bgs; i++) {
160 if (read(blk_fd, &gd, sizeof(gd)) != sizeof(gd)) {
161 testPrintE("Cannot read ext4 group descriptor %d", i);
164 if (gd.bg_free_blocks_count) {
169 gd.bg_free_blocks_count--;
171 if (lseek(blk_fd, -sizeof(gd), SEEK_CUR) == -1) {
172 testPrintE("Cannot lseek to ext4 block group descriptor table to write");
176 if (write(blk_fd, &gd, sizeof(gd)) != sizeof(gd)) {
177 testPrintE("Cannot write modified ext4 group descriptor");
185 class FsRecoveryTest : public ::testing::Test {
187 FsRecoveryTest() : fs_type(FS_UNKNOWN), blk_fd_(-1) {}
189 bool setCacheInfoFromFstab() {
190 fs_type = FS_UNKNOWN;
191 char propbuf[PROPERTY_VALUE_MAX];
192 property_get("ro.hardware", propbuf, "");
193 char fstab_filename[PROPERTY_VALUE_MAX + sizeof(FSTAB_PREFIX)];
194 snprintf(fstab_filename, sizeof(fstab_filename), FSTAB_PREFIX"%s", propbuf);
196 struct fstab *fstab = fs_mgr_read_fstab(fstab_filename);
198 testPrintE("failed to open %s\n", fstab_filename);
200 // Loop through entries looking for cache.
201 for (int i = 0; i < fstab->num_entries; ++i) {
202 if (!strcmp(fstab->recs[i].mount_point, "/cache")) {
203 strcpy(blk_path_, fstab->recs[i].blk_device);
204 if (!strcmp(fstab->recs[i].fs_type, "ext4")) {
207 } else if (!strcmp(fstab->recs[i].fs_type, "f2fs")) {
213 fs_mgr_free_fstab(fstab);
215 return fs_type != FS_UNKNOWN;
218 bool unmountCache() {
219 char *umount_argv[] = {
224 return android_fork_execvp_ext(ARRAY_SIZE(umount_argv), umount_argv,
225 NULL, true, LOG_KLOG, false, NULL,
230 char *mountall_argv[] = {
236 return android_fork_execvp_ext(ARRAY_SIZE(mountall_argv), mountall_argv,
237 NULL, true, LOG_KLOG, false, NULL,
241 int getCacheBlkFd() {
243 blk_fd_ = open(blk_path_, O_RDWR);
248 void closeCacheBlkFd() {
255 void assertCacheHealthy() {
256 const char* test_file = "/cache/FsRecoveryTestGarbage.txt";
257 DataFileVerifier file_verify(test_file);
258 file_verify.verify_write();
259 file_verify.verify_read();
262 virtual void SetUp() {
263 assertCacheHealthy();
264 ASSERT_TRUE(setCacheInfoFromFstab());
267 virtual void TearDown() {
268 // Ensure /cache partition is accessible, mounted and healthy for other
271 ASSERT_TRUE(mountAll());
272 assertCacheHealthy();
278 char blk_path_[FILENAME_MAX];
282 TEST_F(FsRecoveryTest, EXT4_CorruptGdt) {
283 if (fs_type != FS_EXT4) {
286 // Setup test file in /cache.
287 const char* test_file = "/cache/CorruptGdtGarbage.txt";
288 DataFileVerifier file_verify(test_file);
289 file_verify.verify_write();
290 // Unmount and corrupt /cache gdt.
291 ASSERT_TRUE(unmountCache());
292 ASSERT_TRUE(ext4::corruptGdtFreeBlock(getCacheBlkFd()));
294 ASSERT_TRUE(mountAll());
297 file_verify.verify_read();
300 TEST_F(FsRecoveryTest, EXT4_SetErrorBit) {
301 if (fs_type != FS_EXT4) {
304 // Setup test file in /cache.
305 const char* test_file = "/cache/ErrorBitGarbagetxt";
306 DataFileVerifier file_verify(test_file);
307 file_verify.verify_write();
309 // Unmount and set /cache super block error bit.
310 ASSERT_TRUE(unmountCache());
311 ASSERT_TRUE(ext4::setSbErrorBit(getCacheBlkFd()));
313 ASSERT_TRUE(mountAll());
316 file_verify.verify_read();
317 struct ext4_super_block sb;
318 ASSERT_TRUE(ext4::getSuperBlock(getCacheBlkFd(), &sb));
319 // Verify e2fsck has recovered the error bit of sb.
320 ASSERT_FALSE(sb.s_state & 0x2);
322 } // namespace android