util-linux/util-linux-2.13-fdisk-gpt.patch

--- util-linux-2.13-pre4/fdisk/fdisk.c.gpt	2005-10-07 18:40:26.000000000 +0200
+++ util-linux-2.13-pre4/fdisk/fdisk.c	2005-10-07 18:40:26.000000000 +0200
@@ -34,6 +34,8 @@
 #include <linux/blkpg.h>
 #endif
 
+#include "gpt.h"
+
 static void delete_partition(int i);
 
 #define hex_val(c)	({ \
@@ -2400,6 +2402,14 @@
 }
 
 static void
+gpt_warning(char *dev)
+{
+	if (gpt_probe_signature_devname(dev))
+		fprintf(stderr, _("\nWARNING: GPT (GUID Partition Table) detected on '%s'! "
+			"The util fdisk doesn't support GPT. Use GNU Parted.\n\n"), dev);
+}
+
+static void
 try(char *device, int user_specified) {
 	int gb;
 
@@ -2409,6 +2419,7 @@
 	if (!user_specified)
 		if (is_ide_cdrom_or_tape(device))
 			return;
+	gpt_warning(device);
 	if ((fd = open(disk_device, type_open)) >= 0) {
 		gb = get_boot(try_only);
 		if (gb > 0) { /* I/O error */
@@ -2470,6 +2481,8 @@
 	printf(_("%c: unknown command\n"), c);
 }
 
+
+
 int
 main(int argc, char **argv) {
 	int j, c;
@@ -2574,6 +2587,7 @@
 
 		for (j = optind; j < argc; j++) {
 			disk_device = argv[j];
+			gpt_warning(disk_device);
 			if ((fd = open(disk_device, type_open)) < 0)
 				fatal(unable_to_open);
 			if (disksize(fd, &size))
@@ -2594,6 +2608,7 @@
 	else
 		fatal(usage2);
 
+	gpt_warning(disk_device);
 	get_boot(fdisk);
 
 	if (osf_label) {
--- /dev/null	2005-10-07 17:17:17.781101976 +0200
+++ util-linux-2.13-pre4/fdisk/gpt.h	2005-10-07 18:40:26.000000000 +0200
@@ -0,0 +1,9 @@
+
+#ifndef __GPT_H__
+#define __GPT_H__
+
+extern int gpt_probe_signature_fd(int fd);
+extern int gpt_probe_signature_devname(char *devname);
+
+#endif /* __GPT_H__ */
+
--- util-linux-2.13-pre4/fdisk/Makefile.am.gpt	2005-09-12 20:55:27.000000000 +0200
+++ util-linux-2.13-pre4/fdisk/Makefile.am	2005-10-07 18:46:57.000000000 +0200
@@ -5,13 +5,13 @@
 sbin_PROGRAMS = fdisk
 man_MANS = fdisk.8
 fdisk_SOURCES = fdisk.c llseek.c disksize.c fdiskbsdlabel.c fdisksgilabel.c \
-	fdisksunlabel.c fdiskaixlabel.c i386_sys_types.c partname.c
+	fdisksunlabel.c fdiskaixlabel.c i386_sys_types.c partname.c gpt.c
 
 if !SPARC
 
 sbin_PROGRAMS += sfdisk
 man_MANS += sfdisk.8
-sfdisk_SOURCES = sfdisk.c disksize.c i386_sys_types.c partname.c
+sfdisk_SOURCES = sfdisk.c disksize.c i386_sys_types.c partname.c gpt.c
 
 if USE_SLANG
 sbin_PROGRAMS += cfdisk
--- util-linux-2.13-pre4/fdisk/fdisk.8.gpt	2005-10-07 18:40:26.000000000 +0200
+++ util-linux-2.13-pre4/fdisk/fdisk.8	2005-10-07 18:40:26.000000000 +0200
@@ -42,6 +42,11 @@
 partition tables.
 It understands DOS type partition tables and BSD or SUN type disklabels.
 
+.B fdisk 
+doesn't understand GUID Partition Table (GPT) and 
+it is not designed for large partitions. In particular case use more advanced GNU 
+.B parted(8).
+
 The
 .I device
 is usually one of the following:
--- util-linux-2.13-pre4/fdisk/sfdisk.8.gpt	2004-12-31 17:28:30.000000000 +0100
+++ util-linux-2.13-pre4/fdisk/sfdisk.8	2005-10-07 18:40:26.000000000 +0200
@@ -18,6 +18,11 @@
 on a device, check the partitions on a device, and - very dangerous -
 repartition a device.
 
+.B sfdisk 
+doesn't understand GUID Partition Table (GPT) and 
+it is not designed for large partitions. In particular case use more advanced GNU 
+.B parted(8).
+
 .SS "List Sizes"
 .BI "sfdisk \-s " partition
 gives the size of
--- /dev/null	2005-10-07 17:17:17.781101976 +0200
+++ util-linux-2.13-pre4/fdisk/gpt.c	2005-10-07 18:40:26.000000000 +0200
@@ -0,0 +1,287 @@
+/*
+    GPT (GUID Partition Table) signature detection. Based on libparted and 
+    util-linux/partx.
+  
+    Warning: this code doesn't do all GPT checks (CRC32, Protective MBR, ..). It's
+             really GPT signature detection only.
+    
+    -- Karel Zak <kzak@redhat.com> (Jun-2-2005)
+
+*/
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <inttypes.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <sys/utsname.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+#include <linux/fs.h>
+
+#include "gpt.h"
+
+#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
+#define SECTOR_SIZE	512	/* default */
+
+#define _GET_BYTE(x, n)		( ((x) >> (8 * (n))) & 0xff )
+
+#define _PED_SWAP64(x)		( (_GET_BYTE(x, 0) << 56)	\
+				+ (_GET_BYTE(x, 1) << 48)	\
+				+ (_GET_BYTE(x, 2) << 40)	\
+				+ (_GET_BYTE(x, 3) << 32)	\
+				+ (_GET_BYTE(x, 4) << 24)	\
+				+ (_GET_BYTE(x, 5) << 16)	\
+				+ (_GET_BYTE(x, 6) << 8)	\
+				+ (_GET_BYTE(x, 7) << 0) )
+
+#define PED_SWAP64(x)           ((uint64_t) _PED_SWAP64( (uint64_t) (x) ))
+
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+# define CPU_TO_LE64(x)	(x)
+#else
+# define CPU_TO_LE64(x)	PED_SWAP64(x)
+#endif
+
+#define BLKSSZGET  _IO(0x12,104) /* get block device sector size */
+#define BLKGETLASTSECT  _IO(0x12,108)   /* get last sector of block device */
+#define BLKGETSIZE _IO(0x12,96)	/* return device size */
+#define BLKGETSIZE64 _IOR(0x12,114,size_t)	/* return device size in bytes (u64 *arg) */
+
+#define GPT_HEADER_SIGNATURE 0x5452415020494645LL
+#define GPT_PRIMARY_PARTITION_TABLE_LBA 1
+
+typedef struct {
+        uint32_t time_low;
+        uint16_t time_mid;
+        uint16_t time_hi_and_version;
+        uint8_t  clock_seq_hi_and_reserved;
+        uint8_t  clock_seq_low;
+        uint8_t  node[6];
+} /* __attribute__ ((packed)) */ efi_guid_t;
+/* commented out "__attribute__ ((packed))" to work around gcc bug (fixed
+ * in gcc3.1): __attribute__ ((packed)) breaks addressing on initialized
+ * data.  It turns out we don't need it in this case, so it doesn't break
+ * anything :)
+ */
+
+typedef struct _GuidPartitionTableHeader_t {
+	uint64_t Signature;
+	uint32_t Revision;
+	uint32_t HeaderSize;
+	uint32_t HeaderCRC32;
+	uint32_t Reserved1;
+	uint64_t MyLBA;
+	uint64_t AlternateLBA;
+	uint64_t FirstUsableLBA;
+	uint64_t LastUsableLBA;
+	efi_guid_t DiskGUID;
+	uint64_t PartitionEntryLBA;
+	uint32_t NumberOfPartitionEntries;
+	uint32_t SizeOfPartitionEntry;
+	uint32_t PartitionEntryArrayCRC32;
+	uint8_t Reserved2[512 - 92];
+} __attribute__ ((packed)) GuidPartitionTableHeader_t;
+
+struct blkdev_ioctl_param {
+        unsigned int block;
+        size_t content_length;
+        char * block_contents;
+};
+
+static int
+_get_linux_version (void)
+{
+	static int kver = -1;
+	struct utsname uts;
+	int major;
+	int minor;
+	int teeny;
+
+	if (kver != -1)
+		return kver;
+	if (uname (&uts))
+		return kver = 0;
+	if (sscanf (uts.release, "%u.%u.%u", &major, &minor, &teeny) != 3)
+		return kver = 0;
+	return kver = KERNEL_VERSION (major, minor, teeny);
+}
+
+static unsigned int
+_get_sector_size (int fd)
+{
+	unsigned int sector_size;
+
+	if (_get_linux_version() < KERNEL_VERSION (2,3,0))
+		return SECTOR_SIZE;
+	if (ioctl (fd, BLKSSZGET, &sector_size))
+		return SECTOR_SIZE;
+	return sector_size;
+}
+
+static uint64_t
+_get_num_sectors(int fd)
+{
+	int version = _get_linux_version();
+	unsigned long	size;
+	uint64_t bytes=0;
+
+	if (version >= KERNEL_VERSION(2,5,4) || 
+		(version <  KERNEL_VERSION(2,5,0) && 
+		 version >= KERNEL_VERSION (2,4,18)))
+	{
+                if (ioctl(fd, BLKGETSIZE64, &bytes) == 0) 
+                        return bytes / _get_sector_size(fd);
+	}
+	if (ioctl (fd, BLKGETSIZE, &size))
+		return 0;
+	return size;
+}
+
+static uint64_t
+last_lba(int fd)
+{
+	int rc;
+	uint64_t sectors = 0;
+	struct stat s;
+
+	memset(&s, 0, sizeof (s));
+	rc = fstat(fd, &s);
+	if (rc == -1) 
+	{
+		fprintf(stderr, "last_lba() could not stat: %s\n",
+			strerror(errno));
+		return 0;
+	}
+	if (S_ISBLK(s.st_mode))
+		sectors = _get_num_sectors(fd);
+	else 
+	{
+		fprintf(stderr,
+			"last_lba(): I don't know how to handle files with mode %x\n",
+			s.st_mode);
+		sectors = 1;
+	}
+	return sectors - 1;
+}
+
+static ssize_t
+read_lastoddsector(int fd, uint64_t lba, void *buffer, size_t count)
+{
+        int rc;
+        struct blkdev_ioctl_param ioctl_param;
+
+        if (!buffer) return 0; 
+
+        ioctl_param.block = 0; /* read the last sector */
+        ioctl_param.content_length = count;
+        ioctl_param.block_contents = buffer;
+
+        rc = ioctl(fd, BLKGETLASTSECT, &ioctl_param);
+        if (rc == -1) perror("read failed");
+
+        return !rc;
+}
+
+static ssize_t
+read_lba(int fd, uint64_t lba, void *buffer, size_t bytes)
+{
+	int sector_size = _get_sector_size(fd);
+	off_t offset = lba * sector_size;
+        ssize_t bytesread;
+
+	lseek(fd, offset, SEEK_SET);
+	bytesread = read(fd, buffer, bytes);
+
+        /* Kludge.  This is necessary to read/write the last
+           block of an odd-sized disk, until Linux 2.5.x kernel fixes.
+           This is only used by gpt.c, and only to read
+           one sector, so we don't have to be fancy.
+        */
+        if (!bytesread && !(last_lba(fd) & 1) && lba == last_lba(fd))
+                bytesread = read_lastoddsector(fd, lba, buffer, bytes);
+        return bytesread;
+}
+
+static GuidPartitionTableHeader_t *
+alloc_read_gpt_header(int fd, uint64_t lba)
+{
+	GuidPartitionTableHeader_t *gpt = 
+		(GuidPartitionTableHeader_t *) malloc(sizeof (GuidPartitionTableHeader_t));
+	if (!gpt)
+		return NULL;
+	memset(gpt, 0, sizeof (*gpt));
+	if (!read_lba(fd, lba, gpt, sizeof (GuidPartitionTableHeader_t))) 
+	{
+		free(gpt);
+		return NULL;
+	}
+	return gpt;
+}
+
+static int
+gpt_check_signature(int fd, uint64_t lba)
+{
+	GuidPartitionTableHeader_t *gpt;
+	int res=0;
+
+	if ((gpt = alloc_read_gpt_header(fd, lba)))
+	{
+		if (gpt->Signature == CPU_TO_LE64(GPT_HEADER_SIGNATURE))
+			res = 1;
+		free(gpt);
+	}
+	return res;
+}
+
+/* returns:
+ *	0 not found GPT
+ * 	1 for valid primary GPT header
+ *	2 for valid alternative GPT header
+ */
+int
+gpt_probe_signature_fd(int fd)
+{
+	int res = 0;
+
+	/* check primary GPT header */	
+	if (gpt_check_signature(fd, GPT_PRIMARY_PARTITION_TABLE_LBA))
+		res = 1;
+	else
+	{
+		/* check alternative GPT header */
+		uint64_t lastlba = last_lba(fd);
+        	if (gpt_check_signature(fd, lastlba))
+			res = 2;
+	}
+	return res;
+}
+
+int
+gpt_probe_signature_devname(char *devname)
+{
+	int res, fd;
+	if ((fd = open(devname, O_RDONLY)) < 0)
+		return 0;
+	res = gpt_probe_signature_fd(fd);
+	close(fd);
+	return res;
+}
+
+#ifdef GPT_TEST_MAIN
+int
+main(int argc, char **argv)
+{
+	if (argc!=2)
+	{
+		fprintf(stderr, "usage: %s <dev>\n", argv[0]);
+		exit(EXIT_FAILURE);
+	}
+	if (gpt_probe_signature_devname(argv[1]))
+		printf("GPT (GUID Partition Table) detected on %s\n", argv[1]);
+	exit(EXIT_SUCCESS);
+}
+#endif
--- util-linux-2.13-pre4/fdisk/sfdisk.c.gpt	2005-08-14 17:14:18.000000000 +0200
+++ util-linux-2.13-pre4/fdisk/sfdisk.c	2005-10-07 18:40:26.000000000 +0200
@@ -50,6 +50,8 @@
 #include "nls.h"
 #include "common.h"
 
+#include "gpt.h"
+
 #define SIZE(a)	(sizeof(a)/sizeof(a[0]))
 
 /*
@@ -2476,6 +2478,23 @@
 	return NULL;
 }	
 
+static void
+gpt_warning(char *dev, int warn_only)
+{
+	if (force)
+		warn_only = 1;
+	
+	if (gpt_probe_signature_devname(dev)) {
+		fflush(stdout);
+		fprintf(stderr, _("\nWARNING: GPT (GUID Partition Table) detected on '%s'! "
+			"The util sfdisk doesn't support GPT. Use GNU Parted.\n\n"), dev);
+		if (!warn_only) {
+			fprintf(stderr, _("Use the --force flag to overrule this check.\n"));
+			exit(1);
+		}
+	}
+}
+
 static void do_list(char *dev, int silent);
 static void do_size(char *dev, int silent);
 static void do_geom(char *dev, int silent);
@@ -2621,6 +2640,7 @@
 	while ((dev = nextproc()) != NULL) {
 	    if (is_ide_cdrom_or_tape(dev))
 		continue;
+	    gpt_warning(dev, 1);
 	    if (opt_out_geom)
 		do_geom(dev, 1);
 	    if (opt_out_pt_geom)
@@ -2648,6 +2668,7 @@
 
     if (opt_list || opt_out_geom || opt_out_pt_geom || opt_size || verify) {
 	while (optind < argc) {
+	    gpt_warning(argv[optind], 1);
 	    if (opt_out_geom)
 	      do_geom(argv[optind], 0);
 	    if (opt_out_pt_geom)
@@ -2676,6 +2697,7 @@
 	  fatal(_("usage: sfdisk --change-id device partition-number Id\n"));
 	else if (optind != argc-3 && optind != argc-2)
 	  fatal(_("usage: sfdisk --id device partition-number [Id]\n"));
+	gpt_warning(argv[optind], 0);
 	do_change_id(argv[optind], argv[optind+1],
 		     (optind == argc-2) ? 0 : argv[optind+2]);
 	exit(exit_status);
@@ -2685,6 +2707,8 @@
       fatal(_("can specify only one device (except with -l or -s)\n"));
     dev = argv[optind];
 
+    gpt_warning(dev, 0);
+    
     if (opt_reread)
       do_reread(dev);
     else if (restore_sector_file)
@@ -2861,6 +2885,8 @@
 
     z = &oldp;
 
+    gpt_warning(dev, 0);
+    
     rw = (!no_write && (arg || ac > 1));
     fd = my_open(dev, rw, 0);
 
@@ -2934,6 +2960,8 @@
 
     z = &oldp;
 
+    gpt_warning(dev, 0);
+    
     rw = !no_write;
     fd = my_open(dev, rw, 0);