| /* |
| * Copyright (C) 2014 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 <assert.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <getopt.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <unistd.h> |
| |
| #include <logwrap/logwrap.h> |
| #include <sys/stat.h> |
| #include <sys/statvfs.h> |
| #include <utils/Log.h> |
| |
| #define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0])) |
| |
| #define MAX_IO_WRITE_CHUNK_SIZE 0x100000 |
| |
| #ifndef min |
| #define min(a,b) ((a) < (b) ? (a) : (b)) |
| #endif |
| |
| typedef unsigned long u64; |
| |
| static void usage(const char * const progname) { |
| fprintf(stderr, |
| "Usage: %s [-s <seed>] -h <hole size in bytes> -t <total hole size in bytes> " |
| "path\n", |
| progname); |
| } |
| |
| static u64 get_free_space(const char * const path) { |
| struct statvfs s; |
| |
| if (statvfs(path, &s) < 0) { |
| fprintf(stderr, "\nerrno: %d. Failed to get free disk space on %s\n", |
| errno, path); |
| return 0; |
| } else { |
| return (u64)s.f_bsize * (u64)s.f_bfree; |
| } |
| } |
| |
| static u64 get_random_num(const u64 start, const u64 end) { |
| if (end - start <= 0) |
| return start; |
| assert(RAND_MAX >= 0x7FFFFFFF); |
| if ((end - start) > 0x7FFFFFFF) |
| return start + (((u64)random() << 31) | (u64)random()) % (end - start); |
| return start + (random() % (end - start)); |
| } |
| |
| static char get_random_char() { |
| return 'A' + random() % ('Z' - 'A'); |
| } |
| |
| static bool create_unique_file(const char * const dir_path, const u64 size, |
| const u64 id, char * const base, |
| const u64 base_length) { |
| u64 length = 0; |
| int fd; |
| char file_path[FILENAME_MAX]; |
| bool ret = true; |
| |
| base[random() % min(base_length, size)] = get_random_char(); |
| |
| sprintf(file_path, "%s/file_%lu", dir_path, id); |
| fd = open(file_path, O_WRONLY | O_CREAT | O_SYNC, 0777); |
| if (fd < 0) { |
| // We suppress ENOSPC erros as that is common as we approach the |
| // last few MBs of the fs as we don't account for the size of the newly |
| // added meta data after the initial free space computation. |
| if (errno != 28) { |
| fprintf(stderr, "\nerrno: %d. Failed to create %s\n", errno, file_path); |
| } |
| return false; |
| } |
| while (length + base_length < size) { |
| if (write(fd, base, base_length) < 0) { |
| if (errno != 28) { |
| fprintf(stderr, "\nerrno: %d. Failed to write %lu bytes to %s\n", |
| errno, base_length, file_path); |
| } |
| ret = false; |
| goto done; |
| } |
| length += base_length; |
| } |
| if (write(fd, base, size - length) < 0) { |
| if (errno != 28) { |
| fprintf(stderr, "\nerrno: %d. Failed to write last %lu bytes to %s\n", |
| errno, size - length, file_path); |
| } |
| ret = false; |
| goto done; |
| } |
| done: |
| if (close(fd) < 0) { |
| fprintf(stderr, "\nFailed to close %s\n", file_path); |
| ret = false; |
| } |
| return ret; |
| } |
| |
| static bool create_unique_dir(char *dir, const char * const root_path) { |
| char random_string[15]; |
| int i; |
| |
| for (i = 0; i < 14; ++i) { |
| random_string[i] = get_random_char(); |
| } |
| random_string[14] = '\0'; |
| |
| sprintf(dir, "%s/%s", root_path, random_string); |
| |
| if (mkdir(dir, 0777) < 0) { |
| fprintf(stderr, "\nerrno: %d. Failed to create %s\n", errno, dir); |
| return false; |
| } |
| return true; |
| } |
| |
| static bool puncture_fs (const char * const path, const u64 total_size, |
| const u64 hole_size, const u64 total_hole_size) { |
| u64 increments = (hole_size * total_size) / total_hole_size; |
| u64 hole_max; |
| u64 starting_max = 0; |
| u64 ending_max = increments; |
| char stay_dir[FILENAME_MAX], delete_dir[FILENAME_MAX]; |
| char *rm_bin_argv[] = { "/system/bin/rm", "-rf", ""}; |
| u64 file_id = 1; |
| char *base_file_data; |
| u64 i = 0; |
| |
| if (!create_unique_dir(stay_dir, path) || |
| !create_unique_dir(delete_dir, path)) { |
| return false; |
| } |
| |
| base_file_data = (char*) malloc(MAX_IO_WRITE_CHUNK_SIZE); |
| for (i = 0; i < MAX_IO_WRITE_CHUNK_SIZE; ++i) { |
| base_file_data[i] = get_random_char(); |
| } |
| fprintf(stderr, "\n"); |
| while (ending_max <= total_size) { |
| fprintf(stderr, "\rSTAGE 1/2: %d%% Complete", |
| (int) (100.0 * starting_max / total_size)); |
| hole_max = get_random_num(starting_max, ending_max); |
| |
| create_unique_file(stay_dir, |
| hole_max - starting_max, |
| file_id++, |
| base_file_data, |
| MAX_IO_WRITE_CHUNK_SIZE); |
| create_unique_file(delete_dir, |
| hole_size, |
| file_id++, |
| base_file_data, |
| MAX_IO_WRITE_CHUNK_SIZE); |
| |
| starting_max = hole_max + hole_size; |
| ending_max += increments; |
| } |
| create_unique_file(stay_dir, |
| (ending_max - increments - starting_max), |
| file_id++, |
| base_file_data, |
| MAX_IO_WRITE_CHUNK_SIZE); |
| fprintf(stderr, "\rSTAGE 1/2: 100%% Complete\n"); |
| fprintf(stderr, "\rSTAGE 2/2: 0%% Complete"); |
| free(base_file_data); |
| rm_bin_argv[2] = delete_dir; |
| if (android_fork_execvp_ext(ARRAY_SIZE(rm_bin_argv), rm_bin_argv, |
| NULL, 1, LOG_KLOG, 0, NULL) < 0) { |
| fprintf(stderr, "\nFailed to delete %s\n", rm_bin_argv[2]); |
| return false; |
| } |
| fprintf(stderr, "\rSTAGE 2/2: 100%% Complete\n"); |
| return true; |
| } |
| |
| int main (const int argc, char ** const argv) { |
| int opt; |
| int mandatory_opt; |
| char *path = NULL; |
| int seed = time(NULL); |
| |
| u64 total_size = 0; |
| u64 hole_size = 0; |
| u64 total_hole_size = 0; |
| |
| mandatory_opt = 2; |
| while ((opt = getopt(argc, argv, "s:h:t:")) != -1) { |
| switch(opt) { |
| case 's': |
| seed = atoi(optarg); |
| break; |
| case 'h': |
| hole_size = atoll(optarg); |
| mandatory_opt--; |
| break; |
| case 't': |
| total_hole_size = atoll(optarg); |
| mandatory_opt--; |
| break; |
| default: |
| usage(argv[0]); |
| exit(EXIT_FAILURE); |
| } |
| } |
| if (mandatory_opt) { |
| usage(argv[0]); |
| exit(EXIT_FAILURE); |
| } |
| if (optind >= argc) { |
| fprintf(stderr, "\nExpected path name after options.\n"); |
| usage(argv[0]); |
| exit(EXIT_FAILURE); |
| } |
| path = argv[optind++]; |
| |
| if (optind < argc) { |
| fprintf(stderr, "\nUnexpected argument: %s\n", argv[optind]); |
| usage(argv[0]); |
| exit(EXIT_FAILURE); |
| } |
| |
| srandom(seed); |
| fprintf(stderr, "\nRandom seed is: %d\n", seed); |
| |
| total_size = get_free_space(path); |
| if (!total_size) { |
| exit(EXIT_FAILURE); |
| } |
| if (total_size < total_hole_size || total_hole_size < hole_size) { |
| fprintf(stderr, "\nInvalid sizes: total available size should be " |
| "larger than total hole size which is larger than " |
| "hole size\n"); |
| exit(EXIT_FAILURE); |
| } |
| |
| if (!puncture_fs(path, total_size, hole_size, total_hole_size)) { |
| exit(EXIT_FAILURE); |
| } |
| return 0; |
| } |