fdisk: cleanup full disk detection code

The full disk (e.g. /dev/hda) detection code is duplicated on two places and
the code doesn't work correctly with devices which don't support HDIO_GETGEO.

Signed-off-by: Karel Zak <kzak@redhat.com>

fdisk/common.h

@@ -1,3 +1,6 @@
+#ifndef FDISK_COMMON_H
+#define FDISK_COMMON_H
+
 /* common stuff for fdisk, cfdisk, sfdisk */
 
 /* including <linux/fs.h> fails */
@@ -19,7 +22,6 @@ struct hd_geometry {
 
 #define HDIO_GETGEO		0x0301	/* get device geometry */
 
-
 struct systypes {
 	unsigned char type;
 	char *name;
@@ -28,5 +30,8 @@ struct systypes {
 extern struct systypes i386_sys_types[];
 
 extern char *partname(char *dev, int pno, int lth);
+extern int is_probably_full_disk(char *name);
 
 int disksize(int fd, unsigned long long *sectors);
+
+#endif /* FDISK_COMMON_H */

fdisk/disksize.c

@@ -1,3 +1,9 @@
+#include <stdio.h>
+#include <ctype.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
 #include <errno.h>
 #include "common.h"
 
@@ -19,3 +25,30 @@ int disksize(int fd, unsigned long long *sectors) {
 		*sectors = (b >> 9);
 	return 0;
 }
+
+int
+is_probably_full_disk(char *name) {
+#ifdef HDIO_GETGEO
+	struct hd_geometry geometry;
+	int fd, i = 0;
+
+	fd = open(name, O_RDONLY);
+	if (fd >= 0) {
+		i = ioctl(fd, HDIO_GETGEO, &geometry);
+		close(fd);
+	}
+	if (i==0)
+		return (fd >= 0 && geometry.start == 0);
+#endif
+	/*
+	 * The "silly heuristic" is still sexy for us, because
+	 * for example Xen doesn't implement HDIO_GETGEO for virtual
+	 * block devices (/dev/xvda).
+	 *
+	 * -- kzak@redhat.com (23-Feb-2006)
+	 */
+	while (*name)
+		name++;
+	return !isdigit(name[-1]);
+}
+

fdisk/fdisk.c

@@ -786,26 +786,6 @@ get_kernel_geometry(int fd) {
 #endif
 }
 
-static int
-is_probably_full_disk(char *name) {
-#ifdef HDIO_GETGEO
-	struct hd_geometry geometry;
-	int fd, i = 0;
-
-	fd = open(name, O_RDONLY);
-	if (fd >= 0) {
-		i = ioctl(fd, HDIO_GETGEO, &geometry);
-		close(fd);
-	}
-	return (fd >= 0 && i == 0 && geometry.start == 0);
-#else
-	/* silly heuristic */
-	while (*name)
-		name++;
-	return !isdigit(name[-1]);
-#endif
-}
-
 static void
 get_partition_table_geometry(void) {
 	unsigned char *bufp = MBRbuffer;

fdisk/sfdisk.c

@@ -2411,19 +2411,6 @@ is_ide_cdrom_or_tape(char *device) {
 	return is_ide;
 }
 
-static int
-is_probably_full_disk(char *name) {
-	struct hd_geometry geometry;
-	int fd, i = 0;
-
-	fd = open(name, O_RDONLY);
-	if (fd >= 0) {
-		i = ioctl(fd, HDIO_GETGEO, &geometry);
-		close(fd);
-	}
-	return (fd >= 0 && i == 0 && geometry.start == 0);
-}
-
 #define PROC_PARTITIONS	"/proc/partitions"
 static FILE *procf = NULL;