1 2 /* 3 * Copyright (c) 2004 Daniel McNeil <daniel (at) osdl.org> 4 * 2004 Open Source Development Lab 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2 of the License, or 8 * (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See 13 * the GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 18 * 19 * Module: .c 20 */ 21 22 /* 23 * Change History: 24 * 25 * 2/2004 Marty Ridgeway (mridge (at) us.ibm.com) Changes to adapt to LTP 26 * 27 */ 28 #define _GNU_SOURCE 29 30 #include <stdlib.h> 31 #include <sys/types.h> 32 #include <signal.h> 33 #include <errno.h> 34 #include <fcntl.h> 35 #include <stdio.h> 36 #include <unistd.h> 37 #include <memory.h> 38 #include <string.h> 39 #include <limits.h> 40 41 #include "test.h" 42 43 #define NUM_CHILDREN 8 44 45 char *check_zero(unsigned char *buf, int size) 46 { 47 unsigned char *p; 48 49 p = buf; 50 51 while (size > 0) { 52 if (*buf != 0) { 53 fprintf(stderr, 54 "non zero buffer at buf[%d] => 0x%02x,%02x,%02x,%02x\n", 55 buf - p, (unsigned int)buf[0], 56 size > 1 ? (unsigned int)buf[1] : 0, 57 size > 2 ? (unsigned int)buf[2] : 0, 58 size > 3 ? (unsigned int)buf[3] : 0); 59 fprintf(stderr, "buf %p, p %p\n", buf, p); 60 return buf; 61 } 62 buf++; 63 size--; 64 } 65 return 0; /* all zeros */ 66 } 67 68 int dio_read(char *filename) 69 { 70 int fd; 71 int r; 72 void *bufptr; 73 74 TEST(posix_memalign(&bufptr, 4096, 64 * 1024)); 75 if (TEST_RETURN) { 76 tst_resm(TBROK | TRERRNO, "cannot malloc aligned memory"); 77 return -1; 78 } 79 80 while ((fd = open(filename, O_DIRECT | O_RDONLY)) < 0) { 81 } 82 fprintf(stderr, "dio_truncate: child reading file\n"); 83 while (1) { 84 off_t offset; 85 char *bufoff; 86 87 /* read the file, checking for zeros */ 88 offset = lseek(fd, SEEK_SET, 0); 89 do { 90 r = read(fd, bufptr, 64 * 1024); 91 if (r > 0) { 92 if ((bufoff = check_zero(bufptr, r))) { 93 fprintf(stderr, 94 "non-zero read at offset %p\n", 95 offset + bufoff); 96 exit(1); 97 } 98 offset += r; 99 } 100 } while (r > 0); 101 } 102 return 0; 103 } 104 105 void dio_append(char *filename, int fill) 106 { 107 int fd; 108 void *bufptr; 109 int i; 110 int w; 111 112 fd = open(filename, O_DIRECT | O_WRONLY | O_CREAT, 0666); 113 114 if (fd < 0) { 115 perror("cannot create file"); 116 return; 117 } 118 119 TEST(posix_memalign(&bufptr, 4096, 64 * 1024)); 120 if (TEST_RETURN) { 121 tst_resm(TBROK | TRERRNO, "cannot malloc aligned memory"); 122 close(fd); 123 return; 124 } 125 126 memset(bufptr, fill, 64 * 1024); 127 128 for (i = 0; i < 1000; i++) { 129 if ((w = write(fd, bufptr, 64 * 1024)) != 64 * 1024) { 130 fprintf(stderr, "write %d returned %d\n", i, w); 131 } 132 } 133 close(fd); 134 } 135 136 int main(int argc, char **argv) 137 { 138 char filename[PATH_MAX]; 139 int pid[NUM_CHILDREN]; 140 int num_children = 1; 141 int i; 142 143 snprintf(filename, sizeof(filename), "%s/aiodio/file", 144 getenv("TMP") ? getenv("TMP") : "/tmp"); 145 146 for (i = 0; i < num_children; i++) { 147 if ((pid[i] = fork()) == 0) { 148 /* child */ 149 return dio_read(filename); 150 } else if (pid[i] < 0) { 151 /* error */ 152 perror("fork error"); 153 break; 154 } else { 155 /* Parent */ 156 continue; 157 } 158 } 159 160 /* 161 * Parent creates a zero file using DIO. 162 * Truncates it to zero 163 * Create another file with '0xaa' 164 */ 165 for (i = 0; i < 100; i++) { 166 dio_append(filename, 0); 167 truncate(filename, 0); 168 dio_append("junkfile", 0xaa); 169 truncate("junkfile", 0); 170 } 171 172 for (i = 0; i < num_children; i++) { 173 kill(pid[i], SIGTERM); 174 } 175 176 return 0; 177 } 178
