Add OpenBSD support

I managed to make a clean compile and a few test runs using the
attached patches.

These work on OpenBSD 5.4 at least.  I used the 2.1.4 release of
fio as a basis.

Signed-off-by: Jens Axboe <[email protected]>

Makefile

@@ -108,6 +108,10 @@ ifeq ($(CONFIG_TARGET_OS), FreeBSD)
   LIBS	 += -lpthread -lrt
   LDFLAGS += -rdynamic
 endif
+ifeq ($(CONFIG_TARGET_OS), OpenBSD)
+  LIBS	 += -lpthread
+  LDFLAGS += -rdynamic
+endif
 ifeq ($(CONFIG_TARGET_OS), NetBSD)
   LIBS	 += -lpthread -lrt
   LDFLAGS += -rdynamic

filesetup.c

@@ -121,8 +121,10 @@ static int extend_file(struct thread_data *td, struct fio_file *f)
 		dprint(FD_FILE, "truncate file %s, size %llu\n", f->file_name,
 					(unsigned long long) f->real_file_size);
 		if (ftruncate(f->fd, f->real_file_size) == -1) {
-			td_verror(td, errno, "ftruncate");
-			goto err;
+			if (errno != EFBIG) {
+				td_verror(td, errno, "ftruncate");
+				goto err;
+			}
 		}
 	}
 

os/os-openbsd.h

@@ -0,0 +1,60 @@
+#ifndef FIO_OS_OPENBSD_H
+#define FIO_OS_OPENBSD_H
+
+#define	FIO_OS	os_openbsd
+
+#include <errno.h>
+#include <sys/param.h>
+/* XXX hack to avoid conflicts between rbtree.h and <sys/tree.h> */
+#include <sys/sysctl.h>
+#undef RB_BLACK
+#undef RB_RED
+#undef RB_ROOT
+
+#include "../file.h"
+
+#undef  FIO_HAVE_ODIRECT
+#define FIO_USE_GENERIC_BDEV_SIZE
+#define FIO_USE_GENERIC_RAND
+#define FIO_USE_GENERIC_INIT_RANDOM_STATE
+#define FIO_HAVE_GETTID
+
+#undef	FIO_HAVE_CPU_AFFINITY	/* XXX notyet */
+
+#define OS_MAP_ANON		MAP_ANON
+
+#ifndef PTHREAD_STACK_MIN
+#define PTHREAD_STACK_MIN 4096
+#endif
+
+#define fio_swap16(x)	bswap16(x)
+#define fio_swap32(x)	bswap32(x)
+#define fio_swap64(x)	bswap64(x)
+
+typedef off_t off64_t;
+
+static inline int blockdev_invalidate_cache(struct fio_file *f)
+{
+	return EINVAL;
+}
+
+static inline unsigned long long os_phys_mem(void)
+{
+	int mib[2] = { CTL_HW, HW_PHYSMEM64 };
+	uint64_t mem;
+	size_t len = sizeof(mem);
+
+	sysctl(mib, 2, &mem, &len, NULL, 0);
+	return mem;
+}
+
+static inline int gettid(void)
+{
+	return (int) pthread_self();
+}
+
+#ifdef MADV_FREE
+#define FIO_MADV_FREE	MADV_FREE
+#endif
+
+#endif

os/os.h

@@ -17,6 +17,7 @@ enum {
 	os_hpux,
 	os_mac,
 	os_netbsd,
+	os_openbsd,
 	os_solaris,
 	os_windows,
 	os_android,
@@ -30,6 +31,8 @@ enum {
 #include "os-linux.h"
 #elif defined(__FreeBSD__)
 #include "os-freebsd.h"
+#elif defined(__OpenBSD__)
+#include "os-openbsd.h"
 #elif defined(__NetBSD__)
 #include "os-netbsd.h"
 #elif defined(__sun__)