Theodore Ts'o | da1a022 | 2000-08-20 21:48:45 +0000 | [diff] [blame] | 1 | /* |
| 2 | * random_exercise.c --- Test program which exercises an ext2 |
| 3 | * filesystem. It creates a lot of random files in the current |
| 4 | * directory, while holding some files open while they are being |
| 5 | * deleted. This exercises the orphan list code, as well as |
| 6 | * creating lots of fodder for the ext3 journal. |
Theodore Ts'o | efc6f62 | 2008-08-27 23:07:54 -0400 | [diff] [blame] | 7 | * |
Theodore Ts'o | da1a022 | 2000-08-20 21:48:45 +0000 | [diff] [blame] | 8 | * Copyright (C) 2000 Theodore Ts'o. |
| 9 | * |
| 10 | * %Begin-Header% |
| 11 | * This file may be redistributed under the terms of the GNU Public |
| 12 | * License. |
| 13 | * %End-Header% |
| 14 | */ |
| 15 | |
| 16 | #include <unistd.h> |
| 17 | #include <stdio.h> |
| 18 | #include <sys/types.h> |
| 19 | #include <sys/stat.h> |
| 20 | #include <fcntl.h> |
| 21 | |
| 22 | #define MAXFDS 128 |
| 23 | |
| 24 | struct state { |
| 25 | char name[16]; |
| 26 | int state; |
Theodore Ts'o | ad8e553 | 2000-10-18 19:06:13 +0000 | [diff] [blame] | 27 | int isdir; |
Theodore Ts'o | da1a022 | 2000-08-20 21:48:45 +0000 | [diff] [blame] | 28 | }; |
| 29 | |
| 30 | #define STATE_CLEAR 0 |
| 31 | #define STATE_CREATED 1 |
| 32 | #define STATE_DELETED 2 |
| 33 | |
| 34 | struct state state_array[MAXFDS]; |
| 35 | |
Theodore Ts'o | a7de699 | 2001-05-10 21:03:38 +0000 | [diff] [blame] | 36 | #define DATA_SIZE 65536 |
| 37 | |
| 38 | char data_buffer[DATA_SIZE]; |
Theodore Ts'o | ad8e553 | 2000-10-18 19:06:13 +0000 | [diff] [blame] | 39 | |
Theodore Ts'o | da1a022 | 2000-08-20 21:48:45 +0000 | [diff] [blame] | 40 | void clear_state_array() |
| 41 | { |
| 42 | int i; |
| 43 | |
| 44 | for (i = 0; i < MAXFDS; i++) |
| 45 | state_array[i].state = STATE_CLEAR; |
| 46 | } |
| 47 | |
| 48 | int get_random_fd() |
| 49 | { |
| 50 | int fd; |
| 51 | |
| 52 | while (1) { |
| 53 | fd = ((int) random()) % MAXFDS; |
| 54 | if (fd > 2) |
| 55 | return fd; |
| 56 | } |
| 57 | } |
| 58 | |
Theodore Ts'o | a7de699 | 2001-05-10 21:03:38 +0000 | [diff] [blame] | 59 | unsigned int get_inode_num(int fd) |
| 60 | { |
| 61 | struct stat st; |
| 62 | |
| 63 | if (fstat(fd, &st) < 0) { |
| 64 | perror("fstat"); |
| 65 | return 0; |
| 66 | } |
| 67 | return st.st_ino; |
| 68 | } |
| 69 | |
| 70 | |
Theodore Ts'o | da1a022 | 2000-08-20 21:48:45 +0000 | [diff] [blame] | 71 | void create_random_file() |
| 72 | { |
| 73 | char template[16] = "EX.XXXXXX"; |
| 74 | int fd; |
Theodore Ts'o | ad8e553 | 2000-10-18 19:06:13 +0000 | [diff] [blame] | 75 | int isdir = 0; |
Theodore Ts'o | a7de699 | 2001-05-10 21:03:38 +0000 | [diff] [blame] | 76 | int size; |
Theodore Ts'o | efc6f62 | 2008-08-27 23:07:54 -0400 | [diff] [blame] | 77 | |
Theodore Ts'o | da1a022 | 2000-08-20 21:48:45 +0000 | [diff] [blame] | 78 | mktemp(template); |
Theodore Ts'o | ad8e553 | 2000-10-18 19:06:13 +0000 | [diff] [blame] | 79 | isdir = random() & 1; |
| 80 | if (isdir) { |
| 81 | if (mkdir(template, 0700) < 0) |
| 82 | return; |
| 83 | fd = open(template, O_RDONLY, 0600); |
Theodore Ts'o | a7de699 | 2001-05-10 21:03:38 +0000 | [diff] [blame] | 84 | printf("Created temp directory %s, fd = %d\n", |
| 85 | template, fd); |
Theodore Ts'o | ad8e553 | 2000-10-18 19:06:13 +0000 | [diff] [blame] | 86 | } else { |
Theodore Ts'o | efc6f62 | 2008-08-27 23:07:54 -0400 | [diff] [blame] | 87 | size = random() & (DATA_SIZE-1); |
Theodore Ts'o | ad8e553 | 2000-10-18 19:06:13 +0000 | [diff] [blame] | 88 | fd = open(template, O_CREAT|O_RDWR, 0600); |
Theodore Ts'o | a7de699 | 2001-05-10 21:03:38 +0000 | [diff] [blame] | 89 | write(fd, data_buffer, size); |
| 90 | printf("Created temp file %s, fd = %d, size=%d\n", |
| 91 | template, fd, size); |
Theodore Ts'o | ad8e553 | 2000-10-18 19:06:13 +0000 | [diff] [blame] | 92 | } |
Theodore Ts'o | a7de699 | 2001-05-10 21:03:38 +0000 | [diff] [blame] | 93 | state_array[fd].isdir = isdir; |
Theodore Ts'o | da1a022 | 2000-08-20 21:48:45 +0000 | [diff] [blame] | 94 | if (fd < 0) |
| 95 | return; |
Theodore Ts'o | ad8e553 | 2000-10-18 19:06:13 +0000 | [diff] [blame] | 96 | state_array[fd].isdir = isdir; |
Theodore Ts'o | da1a022 | 2000-08-20 21:48:45 +0000 | [diff] [blame] | 97 | state_array[fd].state = STATE_CREATED; |
| 98 | strcpy(state_array[fd].name, template); |
| 99 | } |
| 100 | |
Theodore Ts'o | a7de699 | 2001-05-10 21:03:38 +0000 | [diff] [blame] | 101 | void truncate_file(int fd) |
| 102 | { |
| 103 | int size; |
| 104 | |
| 105 | size = random() & (DATA_SIZE-1); |
| 106 | |
| 107 | if (state_array[fd].isdir) |
| 108 | return; |
| 109 | |
| 110 | ftruncate(fd, size); |
| 111 | printf("Truncating temp file %s, fd = %d, ino=%u, size=%d\n", |
| 112 | state_array[fd].name, fd, get_inode_num(fd), size); |
| 113 | } |
| 114 | |
| 115 | |
Theodore Ts'o | da1a022 | 2000-08-20 21:48:45 +0000 | [diff] [blame] | 116 | void unlink_file(int fd) |
| 117 | { |
| 118 | char *filename = state_array[fd].name; |
Theodore Ts'o | efc6f62 | 2008-08-27 23:07:54 -0400 | [diff] [blame] | 119 | |
Theodore Ts'o | a7de699 | 2001-05-10 21:03:38 +0000 | [diff] [blame] | 120 | printf("Deleting %s, fd = %d, ino = %u\n", filename, fd, |
| 121 | get_inode_num(fd)); |
Theodore Ts'o | ad8e553 | 2000-10-18 19:06:13 +0000 | [diff] [blame] | 122 | |
| 123 | if (state_array[fd].isdir) |
| 124 | rmdir(filename); |
| 125 | else |
| 126 | unlink(filename); |
Theodore Ts'o | da1a022 | 2000-08-20 21:48:45 +0000 | [diff] [blame] | 127 | state_array[fd].state = STATE_DELETED; |
| 128 | } |
| 129 | |
| 130 | void close_file(int fd) |
| 131 | { |
| 132 | char *filename = state_array[fd].name; |
Theodore Ts'o | efc6f62 | 2008-08-27 23:07:54 -0400 | [diff] [blame] | 133 | |
Theodore Ts'o | a7de699 | 2001-05-10 21:03:38 +0000 | [diff] [blame] | 134 | printf("Closing %s, fd = %d, ino = %u\n", filename, fd, |
| 135 | get_inode_num(fd)); |
Theodore Ts'o | efc6f62 | 2008-08-27 23:07:54 -0400 | [diff] [blame] | 136 | |
Theodore Ts'o | da1a022 | 2000-08-20 21:48:45 +0000 | [diff] [blame] | 137 | close(fd); |
| 138 | state_array[fd].state = STATE_CLEAR; |
| 139 | } |
| 140 | |
| 141 | |
| 142 | main(int argc, char **argv) |
| 143 | { |
| 144 | int i, fd; |
Theodore Ts'o | ad8e553 | 2000-10-18 19:06:13 +0000 | [diff] [blame] | 145 | |
| 146 | memset(data_buffer, 0, sizeof(data_buffer)); |
| 147 | sprintf(data_buffer, "This is a test file created by the " |
| 148 | "random_exerciser program\n"); |
Theodore Ts'o | efc6f62 | 2008-08-27 23:07:54 -0400 | [diff] [blame] | 149 | |
Theodore Ts'o | da1a022 | 2000-08-20 21:48:45 +0000 | [diff] [blame] | 150 | for (i=0; i < 100000; i++) { |
| 151 | fd = get_random_fd(); |
| 152 | switch (state_array[fd].state) { |
| 153 | case STATE_CLEAR: |
| 154 | create_random_file(); |
| 155 | break; |
| 156 | case STATE_CREATED: |
Theodore Ts'o | a7de699 | 2001-05-10 21:03:38 +0000 | [diff] [blame] | 157 | if ((state_array[fd].isdir == 0) && |
| 158 | (random() & 2)) |
| 159 | truncate_file(fd); |
| 160 | else |
| 161 | unlink_file(fd); |
Theodore Ts'o | da1a022 | 2000-08-20 21:48:45 +0000 | [diff] [blame] | 162 | break; |
| 163 | case STATE_DELETED: |
| 164 | close_file(fd); |
| 165 | break; |
| 166 | } |
| 167 | } |
| 168 | } |
| 169 | |
| 170 | |