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.sun.com/software/products/lustre/docs/GPLv2.pdf
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
31 * This file is part of Lustre, http://www.lustre.org/
32 * Lustre is a trademark of Sun Microsystems, Inc.
44 #include <sys/types.h>
48 /* return index of the first byte not matching given byte
49 * or buffer size if all bytes are matching */
50 static size_t check_bytes(const char *buf, int byte, size_t len)
54 for (p = buf; p < buf + len; p++)
60 int main(int argc, char **argv)
65 int blocks, seek_blocks;
73 if (argc < 5 || argc > 6) {
74 printf("Usage: %s <read/write/rdwr/readhole> file seek nr_blocks [blocksize]\n", argv[0]);
78 if (!strcmp(argv[1], "read"))
80 else if (!strcmp(argv[1], "write"))
82 else if (!strcmp(argv[1], "rdwr"))
84 else if (!strcmp(argv[1], "readhole")) {
88 printf("Usage: %s <read/write/rdwr> file seek nr_blocks [blocksize]\n", argv[0]);
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", argv[0]);
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,
116 seek = (off64_t)seek_blocks * (off64_t)st.st_blksize;
117 len = blocks * st.st_blksize;
119 buf = mmap(0, len, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, 0, 0);
120 if (buf == MAP_FAILED) {
121 printf("No memory %s\n", strerror(errno));
124 memset(buf, pad, len);
126 if (action == O_WRONLY || action == O_RDWR) {
127 if (lseek64(fd, seek, SEEK_SET) < 0) {
128 printf("lseek64 failed: %s\n", strerror(errno));
132 rc = write(fd, buf, len);
134 printf("Write error %s (rc = %d, len = %ld)\n",
135 strerror(errno), rc, len);
140 if (action == O_RDONLY || action == O_RDWR) {
141 if (lseek64(fd, seek, SEEK_SET) < 0) {
142 printf("Cannot seek %s\n", strerror(errno));
145 /* reset all bytes to something nor 0x0 neither 0xab */
146 memset(buf, 0x5e, len);
147 rc = read(fd, buf, len);
149 printf("Read error: %s rc = %d\n",strerror(errno),rc);
153 if (check_bytes(buf, pad, len) != len) {
154 printf("Data mismatch\n");
161 #else /* !O_DIRECT */
162 #warning O_DIRECT not defined, directio test will fail
163 printf("O_DIRECT not defined\n");
165 #endif /* !O_DIRECT */