Add a test program which just dumps out device size as mkfs would see it. Makes finger-pointing at buggy drivers easier.

src/Makefile

@@ -37,7 +37,7 @@ TARGETS = dirstress fill fill2 getpagesize holes lstat64 \
 	nametest permname randholes runas truncfile usemem \
 	mmapcat append_reader append_writer dirperf metaperf \
 	devzero feature alloc fault fstest t_access_root \
-	godown resvtest writemod
+	godown resvtest writemod getdevicesize
 
 LINUX_TARGETS = loggen xfsctl bstat t_mtab
 

src/getdevicesize.c

@@ -0,0 +1,85 @@
+/*
+ * Copyright (c) 2004 Silicon Graphics, Inc.  All Rights Reserved.
+ * 
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ * 
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * 
+ * Further, this software is distributed without any warranty that it is
+ * free of the rightful claim of any third person regarding infringement
+ * or the like.  Any license provided herein, whether implied or
+ * otherwise, applies only to this software file.  Patent licenses, if
+ * any, provided herein do not apply to combinations of this program with
+ * other software, or any other product whatsoever.
+ * 
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write the Free Software Foundation, Inc., 59
+ * Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ * 
+ * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
+ * Mountain View, CA  94043, or:
+ * 
+ * http://www.sgi.com 
+ * 
+ * For further information regarding this notice, see: 
+ * 
+ * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
+ */
+
+/*
+ * Test program that uses the same interfaces as mkfs.xfs for
+ * Linux, dumps out just the device size values from a driver.
+ */
+
+#include <stdio.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+#include <sys/mount.h>
+
+#ifndef BLKGETSIZE64
+# define BLKGETSIZE64   _IOR(0x12,114,size_t)
+#endif
+#ifndef BLKSSZGET
+# define BLKSSZGET	_IO(0x12,104)
+#endif
+
+int main(int argc, char **argv)
+{
+	__uint64_t	size;
+	long long	sz = -1;
+	int		error, fd;
+
+	if (argc != 2) {
+		fputs("insufficient arguments\n", stderr);
+		return 1;
+	}
+	fd = open(argv[1], O_RDONLY);
+	if (!fd) {
+		perror(argv[1]);
+		return 1;
+	}
+
+	error = ioctl(fd, BLKGETSIZE64, &size);
+	if (error >= 0) {
+		/* BLKGETSIZE64 returns size in bytes not 512-byte blocks */
+		sz = (long long)(size >> 9);
+		printf("%lld 512 byte blocks (BLKGETSIZE64)\n", sz);
+	} else {
+		/* If BLKGETSIZE64 fails, try BLKGETSIZE */
+		unsigned long tmpsize;
+
+		error = ioctl(fd, BLKGETSIZE, &tmpsize);
+		if (error < 0) {
+			fprintf(stderr, "can't determine device size");
+			return 1;
+		}
+		sz = (long long)tmpsize;
+		printf("%lld 512 byte blocks (BLKGETSIZE)\n", sz);
+	}
+	return 0;
+}