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>
44 /* return index of the first byte not matching given byte
45 * or buffer size if all bytes are matching */
46 static size_t check_bytes(const char *buf, int byte, size_t len)
50 for (p = buf; p < buf + len; p++)
56 int main(int argc, char **argv)
61 int blocks, seek_blocks;
69 if (argc < 5 || argc > 6) {
70 printf("Usage: %s <read/write/rdwr/readhole> file seek nr_blocks [blocksize]\n", argv[0]);
74 if (!strcmp(argv[1], "read"))
76 else if (!strcmp(argv[1], "write"))
78 else if (!strcmp(argv[1], "rdwr"))
80 else if (!strcmp(argv[1], "readhole")) {
84 printf("Usage: %s <read/write/rdwr> file seek nr_blocks [blocksize]\n", argv[0]);
89 seek_blocks = strtoul(argv[3], 0, 0);
90 blocks = strtoul(argv[4], 0, 0);
92 printf("Usage: %s <read/write/rdwr> file seek nr_blocks [blocksize]\n", argv[0]);
96 fd = open(fname, O_LARGEFILE | O_DIRECT | O_RDWR | O_CREAT, 0644);
98 printf("Cannot open %s: %s\n", fname, strerror(errno));
103 st.st_blksize = strtoul(argv[5], 0, 0);
104 else if (fstat64(fd, &st) < 0) {
105 printf("Cannot stat %s: %s\n", fname, strerror(errno));
109 printf("directio on %s for %dx%lu bytes\n", fname, blocks,
110 (unsigned long)st.st_blksize);
112 seek = (off64_t)seek_blocks * (off64_t)st.st_blksize;
113 len = blocks * st.st_blksize;
115 buf = mmap(0, len, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, 0, 0);
116 if (buf == MAP_FAILED) {
117 printf("No memory %s\n", strerror(errno));
120 memset(buf, pad, len);
122 if (action == O_WRONLY || action == O_RDWR) {
123 if (lseek64(fd, seek, SEEK_SET) < 0) {
124 printf("lseek64 failed: %s\n", strerror(errno));
128 rc = write(fd, buf, len);
130 printf("Write error %s (rc = %d, len = %ld)\n",
131 strerror(errno), rc, len);
136 if (action == O_RDONLY || action == O_RDWR) {
137 if (lseek64(fd, seek, SEEK_SET) < 0) {
138 printf("Cannot seek %s\n", strerror(errno));
141 /* reset all bytes to something nor 0x0 neither 0xab */
142 memset(buf, 0x5e, len);
143 rc = read(fd, buf, len);
145 printf("Read error: %s rc = %d\n",strerror(errno),rc);
149 if (check_bytes(buf, pad, len) != len) {
150 printf("Data mismatch\n");
157 #else /* !O_DIRECT */
158 #warning O_DIRECT not defined, directio test will fail
159 printf("O_DIRECT not defined\n");
161 #endif /* !O_DIRECT */