+/* -*- 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 <fcntl.h>
#include <stdlib.h>
#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
#include <sys/mman.h>
-// not correctly in the headers yet!!
-#define O_DIRECT 040000 /* direct disk access hint */
-
int main(int argc, char **argv)
{
int fd;
- char *buf;
- int pages;
- int rc;
+ char *rbuf, *wbuf;
+ int blocks, seek_blocks;
+ long len;
+ off64_t seek;
+ struct stat64 st;
+ int rc;
+
+ if (argc < 4 || argc > 5) {
+ printf("Usage: %s file seek nr_blocks [blocksize]\n", argv[0]);
+ return 1;
+ }
+
+ 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 (argc != 3) {
- printf("Usage: %s file nr_pages\n", argv[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;
}
- pages = strtoul(argv[2], 0, 0);
- printf("directio on %s for %d pages \n", argv[1], pages);
+ printf("directio on %s for %dx%lu bytes \n", argv[1], blocks,
+ st.st_blksize);
- buf = mmap(0, pages * 4096, PROT_READ|PROT_WRITE,
- MAP_PRIVATE|MAP_ANON, 0, 0);
- if (!buf) {
+ seek = (off64_t)seek_blocks * (off64_t)st.st_blksize;
+ if (lseek64(fd, seek, SEEK_SET) < 0) {
+ printf("lseek64 failed: %s\n", strerror(errno));
+ return 1;
+ }
+
+ len = blocks * st.st_blksize;
+ 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;
}
- fd = open(argv[1], O_DIRECT | O_RDWR | O_CREAT);
- if (fd == -1) {
- printf("Cannot open %s: %s\n", argv[1], strerror(errno));
+ 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;
}
- rc = read(fd, buf, pages * 4096);
- if (rc != pages * 4096) {
- printf("Read error: %s, rc %d\n", strerror(errno), rc);
+ 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 ( lseek(fd, 0, SEEK_SET) != 0 ) {
+ if (lseek64(fd, seek, SEEK_SET) < 0) {
printf("Cannot seek %s\n", strerror(errno));
return 1;
}
- rc = write(fd, buf, pages * 4096);
- if (rc != pages * 4096) {
- printf("Write error %s\n", strerror(errno));
+ rc = read(fd, rbuf, len);
+ if (rc != len) {
+ printf("Read error: %s (rc = %d)\n", strerror(errno), rc);
+ return 1;
+ }
+
+ if (memcmp(wbuf, rbuf, len)) {
+ printf("Data mismatch\n");
return 1;
}
+ printf("PASS\n");
return 0;
}