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/
28 * Lustre is a trademark of Sun Microsystems, Inc.
40 #include <sys/types.h>
45 * return index of the first byte not matching given byte
46 * or buffer size if all bytes are matching
48 static size_t check_bytes(const char *buf, int byte, size_t len)
52 for (p = buf; p < buf + len; p++)
58 int main(int argc, char **argv)
63 int blocks, seek_blocks;
71 if (argc < 5 || argc > 6) {
72 printf("Usage: %s <read/write/rdwr/readhole> file seek nr_blocks [blocksize]\n",
77 if (!strcmp(argv[1], "read")) {
79 } else if (!strcmp(argv[1], "write")) {
81 } else if (!strcmp(argv[1], "rdwr")) {
83 } else if (!strcmp(argv[1], "readhole")) {
87 printf("Usage: %s <read/write/rdwr> file seek nr_blocks [blocksize]\n",
93 seek_blocks = strtoul(argv[3], 0, 0);
94 blocks = strtoul(argv[4], 0, 0);
96 printf("Usage: %s <read/write/rdwr> file seek nr_blocks [blocksize]\n",
101 fd = open(fname, O_LARGEFILE | O_DIRECT | O_RDWR | O_CREAT, 0644);
103 printf("Cannot open %s: %s\n", fname, strerror(errno));
108 st.st_blksize = strtoul(argv[5], 0, 0);
109 } else if (fstat64(fd, &st) < 0) {
110 printf("Cannot stat %s: %s\n", fname, strerror(errno));
114 printf("directio on %s for %dx%lu bytes\n", fname, blocks,
115 (unsigned long)st.st_blksize);
117 seek = (off64_t)seek_blocks * (off64_t)st.st_blksize;
118 len = blocks * st.st_blksize;
121 PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, 0, 0);
122 if (buf == MAP_FAILED) {
123 printf("No memory %s\n", strerror(errno));
126 memset(buf, pad, len);
128 if (action == O_WRONLY || action == O_RDWR) {
129 if (lseek64(fd, seek, SEEK_SET) < 0) {
130 printf("lseek64 failed: %s\n", strerror(errno));
134 rc = write(fd, buf, len);
136 printf("Write error %s (rc = %d, len = %ld)\n",
137 strerror(errno), rc, len);
142 if (action == O_RDONLY || action == O_RDWR) {
143 if (lseek64(fd, seek, SEEK_SET) < 0) {
144 printf("Cannot seek %s\n", strerror(errno));
147 /* reset all bytes to something nor 0x0 neither 0xab */
148 memset(buf, 0x5e, len);
149 rc = read(fd, buf, len);
151 printf("Read error: %s rc = %d\n", strerror(errno), rc);
155 if (check_bytes(buf, pad, len) != len) {
156 printf("Data mismatch\n");
163 #else /* !O_DIRECT */
164 #warning O_DIRECT not defined, directio test will fail
165 printf("O_DIRECT not defined\n");
167 #endif /* !O_DIRECT */