1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 only,
10 * as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License version 2 for more details (a copy is included
16 * in the LICENSE file that accompanied this code).
18 * You should have received a copy of the GNU General Public License
19 * version 2 along with this program; If not, see
20 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23 * CA 95054 USA or visit www.sun.com if you need additional information or
29 * Copyright 2008 Sun Microsystems, Inc. All rights reserved
30 * Use is subject to license terms.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
46 #include <sys/types.h>
50 /* return index of the first byte not matching given byte
51 * or buffer size if all bytes are matching */
52 static size_t check_bytes(const char *buf, int byte, size_t len)
56 for (p = buf; p < buf + len; p++)
62 int main(int argc, char **argv)
67 int blocks, seek_blocks;
75 if (argc < 5 || argc > 6) {
76 printf("Usage: %s <read/write/rdwr/readhole> file seek nr_blocks [blocksize]\n", argv[0]);
80 if (!strcmp(argv[1], "read"))
82 else if (!strcmp(argv[1], "write"))
84 else if (!strcmp(argv[1], "rdwr"))
86 else if (!strcmp(argv[1], "readhole")) {
90 printf("Usage: %s <read/write/rdwr> file seek nr_blocks [blocksize]\n", argv[0]);
95 seek_blocks = strtoul(argv[3], 0, 0);
96 blocks = strtoul(argv[4], 0, 0);
98 printf("Usage: %s <read/write/rdwr> file seek nr_blocks [blocksize]\n", argv[0]);
102 fd = open(fname, O_LARGEFILE | O_DIRECT | O_RDWR | O_CREAT, 0644);
104 printf("Cannot open %s: %s\n", fname, strerror(errno));
109 st.st_blksize = strtoul(argv[5], 0, 0);
110 else if (fstat64(fd, &st) < 0) {
111 printf("Cannot stat %s: %s\n", fname, strerror(errno));
115 printf("directio on %s for %dx%lu bytes \n", fname, blocks,
118 seek = (off64_t)seek_blocks * (off64_t)st.st_blksize;
119 len = blocks * st.st_blksize;
121 buf = mmap(0, len, 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 */