4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
27 * This file is part of Lustre, http://www.lustre.org/
39 #include <sys/types.h>
44 * return index of the first byte not matching given byte
45 * or buffer size if all bytes are matching
47 static size_t check_bytes(const char *buf, int byte, size_t len)
51 for (p = buf; p < buf + len; p++)
57 int main(int argc, char **argv)
62 int blocks, seek_blocks;
70 if (argc < 5 || argc > 6) {
71 printf("Usage: %s <read/write/rdwr/readhole> file seek nr_blocks [blocksize]\n",
76 if (!strcmp(argv[1], "read")) {
78 } else if (!strcmp(argv[1], "write")) {
80 } else if (!strcmp(argv[1], "rdwr")) {
82 } else if (!strcmp(argv[1], "readhole")) {
86 printf("Usage: %s <read/write/rdwr> file seek nr_blocks [blocksize]\n",
92 seek_blocks = strtoul(argv[3], 0, 0);
93 blocks = strtoul(argv[4], 0, 0);
95 printf("Usage: %s <read/write/rdwr> file seek nr_blocks [blocksize]\n",
100 fd = open(fname, O_LARGEFILE | O_DIRECT | O_RDWR | O_CREAT, 0644);
102 printf("Cannot open %s: %s\n", fname, strerror(errno));
107 st.st_blksize = strtoul(argv[5], 0, 0);
108 } else if (fstat64(fd, &st) < 0) {
109 printf("Cannot stat %s: %s\n", fname, strerror(errno));
113 printf("directio on %s for %dx%lu bytes\n", fname, blocks,
114 (unsigned long)st.st_blksize);
116 seek = (off64_t)seek_blocks * (off64_t)st.st_blksize;
117 len = blocks * st.st_blksize;
120 PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, 0, 0);
121 if (buf == MAP_FAILED) {
122 printf("No memory %s\n", strerror(errno));
125 memset(buf, pad, len);
127 if (action == O_WRONLY || action == O_RDWR) {
128 if (lseek64(fd, seek, SEEK_SET) < 0) {
129 printf("lseek64 failed: %s\n", strerror(errno));
133 rc = write(fd, buf, len);
135 printf("Write error %s (rc = %d, len = %ld)\n",
136 strerror(errno), rc, len);
141 if (action == O_RDONLY || action == O_RDWR) {
142 if (lseek64(fd, seek, SEEK_SET) < 0) {
143 printf("Cannot seek %s\n", strerror(errno));
146 /* reset all bytes to something nor 0x0 neither 0xab */
147 memset(buf, 0x5e, len);
148 rc = read(fd, buf, len);
150 printf("Read error: %s rc = %d\n", strerror(errno), rc);
154 if (check_bytes(buf, pad, len) != len) {
155 printf("Data mismatch\n");
162 #else /* !O_DIRECT */
163 #warning O_DIRECT not defined, directio test will fail
164 printf("O_DIRECT not defined\n");
166 #endif /* !O_DIRECT */