+/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
+ * vim:expandtab:shiftwidth=8:tabstop=8:
+ */
+#define _GNU_SOURCE
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/mman.h>
-// not correctly in the headers yet!!
-#ifndef O_DIRECT
-#define O_DIRECT 040000 /* direct disk access hint */
-#endif
+int write_buffer(char *fname, char *buffer, int len)
+{
+ int fd, rc;
+
+ fd = open(fname, O_WRONLY | O_CREAT | O_TRUNC, 0644);
+ if (fd == -1) {
+ printf("Cannot open %s: %s\n", fname, strerror(errno));
+ exit(1);
+ }
+ rc = write(fd, buffer, len);
+ if (rc != len) {
+ printf("write: %d\n", rc);
+ exit(1);
+ }
+ close(fd);
+ return 0;
+}
+
+void verify(char *buffer, char *compare, int length)
+{
+ int i;
+ for (i = 0; i < length; i++) {
+ if (buffer[i] != compare[i]) {
+ fprintf(stderr, "garbage read (i=%d): expected %c, found %c\n",
+ i, compare[i], buffer[i]);
+ write_buffer("/tmp/dio1", buffer, length);
+ write_buffer("/tmp/dio2", compare, length);
+ exit(1);
+ }
+ }
+}
+
int main(int argc, char **argv)
{
int fd;
- char *buf;
- int blocks;
+ char *rbuf, *wbuf;
+ int blocks, seek_blocks;
long len;
- struct stat st;
+ off64_t seek;
+ struct stat64 st;
int rc;
- if (argc != 3) {
- printf("Usage: %s file nr_blocks\n", argv[0]);
+ if (argc < 4 || argc > 5) {
+ printf("Usage: %s file seek nr_blocks [blocksize]\n", argv[0]);
return 1;
}
- blocks = strtoul(argv[2], 0, 0);
- fd = open(argv[1], O_DIRECT | O_RDWR | O_CREAT, 0644);
+ seek_blocks = strtoul(argv[2], 0, 0);
+ blocks = strtoul(argv[3], 0, 0);
+
+ fd = open(argv[1], O_LARGEFILE | O_DIRECT | O_RDWR | O_CREAT, 0644);
if (fd == -1) {
printf("Cannot open %s: %s\n", argv[1], strerror(errno));
return 1;
}
- if (fstat(fd, &st) < 0) {
+ if (argc == 5)
+ st.st_blksize = strtoul(argv[4], 0, 0);
+ else if (fstat64(fd, &st) < 0) {
printf("Cannot stat %s: %s\n", argv[1], strerror(errno));
return 1;
}
- printf("directio on %s for %dx%lu blocks \n", argv[1], blocks,
- st.st_blksize);
+ fprintf(stderr, "directio on %s for %dx%lu bytes \n", argv[1], blocks,
+ st.st_blksize);
+ seek = (off64_t)seek_blocks * (off64_t)st.st_blksize;
+#if 0
+ if (lseek64(fd, seek, SEEK_SET) < 0) {
+ printf("lseek64 failed: %s\n", strerror(errno));
+ return 1;
+ }
+#endif
len = blocks * st.st_blksize;
- buf = mmap(0, len, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, 0, 0);
- if (!buf) {
+ wbuf = mmap(0, len, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, 0, 0);
+ if (wbuf == MAP_FAILED) {
+ printf("No memory %s\n", strerror(errno));
+ return 1;
+ }
+
+ rbuf = mmap(0, len, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, 0, 0);
+ if (rbuf == MAP_FAILED) {
printf("No memory %s\n", strerror(errno));
return 1;
}
- memset(buf, 0xba, len);
- rc = write(fd, buf, len);
+ memset(wbuf, 0xba, len);
+ rc = write(fd, wbuf, len);
+ if (rc != len) {
+ printf("Write error %s (rc = %d)\n", strerror(errno), rc);
+ return 1;
+ }
+
+ if (lseek64(fd, seek, SEEK_SET) < 0) {
+ printf("Cannot seek %s\n", strerror(errno));
+ return 1;
+ }
+
+ rc = read(fd, rbuf, len);
if (rc != len) {
+ printf("Read error: %s (rc = %d)\n", strerror(errno), rc);
+ return 1;
+ }
+
+ verify(rbuf, wbuf, len);
+ if (memcmp(wbuf, rbuf, len)) {
+ printf("Data mismatch on line %d\n", __LINE__);
+ return 1;
+ }
+
+ /* try 512-byte buffers, and make sure that the other parts of the
+ * page aren't modified. */
+ if (st.st_blksize < 4096) {
+ printf("512-byte block size tests skipped (because blocksize "
+ "passed is < 4k)\n");
+ printf("PASS\n");
+ return 0;
+ }
+
+
+
+ /* write test */
+ if (lseek64(fd, 512, SEEK_SET) < 0) {
+ printf("Cannot seek %s\n", strerror(errno));
+ return 1;
+ }
+
+ memset(wbuf, 0x44, len);
+ memset(wbuf + 2048, 0x69, 512);
+ rc = write(fd, wbuf + 2048, 512);
+ if (rc != 512) {
printf("Write error %s (rc = %d)\n", strerror(errno), rc);
return 1;
}
- if (lseek(fd, 0, SEEK_SET) != 0) {
+ memset(rbuf, 0x44, len);
+ memset(rbuf + 2048, 0x69, 512);
+ if (memcmp(wbuf, rbuf, len)) {
+ printf("Data mismatch on line %d\n", __LINE__);
+ return 1;
+ }
+
+ /* read test */
+ if (lseek64(fd, 512, SEEK_SET) < 0) {
+ printf("Cannot seek %s\n", strerror(errno));
+ return 1;
+ }
+ memset(rbuf, 0xba, len);
+ rc = read(fd, rbuf + 1024, 512);
+ if (rc != 512) {
+ printf("Read error: %s (rc = %d)\n", strerror(errno), rc);
+ return 1;
+ }
+
+ memset(wbuf, 0xba, len);
+ memset(wbuf + 1024, 0x69, 512);
+
+ verify(rbuf, wbuf, len);
+#if 0
+ if (memcmp(wbuf, rbuf, len)) {
+ printf("Data mismatch on line %d\n", __LINE__);
+ return 1;
+ }
+#endif
+
+ /* read back the whole block, to see that it's untouched. */
+ if (lseek64(fd, seek, SEEK_SET) < 0) {
printf("Cannot seek %s\n", strerror(errno));
return 1;
}
- rc = read(fd, buf, len);
+ memset(rbuf, 0x1, len);
+ rc = read(fd, rbuf, len);
if (rc != len) {
printf("Read error: %s (rc = %d)\n", strerror(errno), rc);
return 1;
}
+ memset(wbuf, 0xba, len);
+ memset(wbuf + 512, 0x69, 512);
+ if (memcmp(wbuf, rbuf, len)) {
+ printf("Data mismatch on line %d\n", __LINE__);
+ return 1;
+ }
+
+ printf("PASS\n");
return 0;
}
git://git.whamcloud.com / fs / lustre-release.git / blobdiff