fdisk: initial stab at GPT partition support
Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/util-linux/fdisk.c b/util-linux/fdisk.c
index b6417a3..3f2e0d3 100644
--- a/util-linux/fdisk.c
+++ b/util-linux/fdisk.c
@@ -107,12 +107,30 @@
unsigned char size4[4]; /* nr of sectors in partition */
} PACKED;
+/*
+ * per partition table entry data
+ *
+ * The four primary partitions have the same sectorbuffer (MBRbuffer)
+ * and have NULL ext_pointer.
+ * Each logical partition table entry has two pointers, one for the
+ * partition and one link to the next one.
+ */
+struct pte {
+ struct partition *part_table; /* points into sectorbuffer */
+ struct partition *ext_pointer; /* points into sectorbuffer */
+ sector_t offset_from_dev_start; /* disk sector number */
+ char *sectorbuffer; /* disk sector contents */
+#if ENABLE_FEATURE_FDISK_WRITABLE
+ char changed; /* boolean */
+#endif
+};
+
#define unable_to_open "can't open '%s'"
#define unable_to_read "can't read from %s"
#define unable_to_seek "can't seek on %s"
enum label_type {
- LABEL_DOS, LABEL_SUN, LABEL_SGI, LABEL_AIX, LABEL_OSF
+ LABEL_DOS, LABEL_SUN, LABEL_SGI, LABEL_AIX, LABEL_OSF, LABEL_GPT
};
#define LABEL_IS_DOS (LABEL_DOS == current_label_type)
@@ -149,6 +167,14 @@
#define STATIC_OSF extern
#endif
+#if ENABLE_FEATURE_GPT_LABEL
+#define LABEL_IS_GPT (LABEL_GPT == current_label_type)
+#define STATIC_GPT static
+#else
+#define LABEL_IS_GPT 0
+#define STATIC_GPT extern
+#endif
+
enum action { OPEN_MAIN, TRY_ONLY, CREATE_EMPTY_DOS, CREATE_EMPTY_SUN };
static void update_units(void);
@@ -162,6 +188,7 @@
#endif
static const char *partition_type(unsigned char type);
static void get_geometry(void);
+static void read_pte(struct pte *pe, sector_t offset);
#if ENABLE_FEATURE_SUN_LABEL || ENABLE_FEATURE_FDISK_WRITABLE
static int get_boot(enum action what);
#else
@@ -174,24 +201,6 @@
static sector_t get_start_sect(const struct partition *p);
static sector_t get_nr_sects(const struct partition *p);
-/*
- * per partition table entry data
- *
- * The four primary partitions have the same sectorbuffer (MBRbuffer)
- * and have NULL ext_pointer.
- * Each logical partition table entry has two pointers, one for the
- * partition and one link to the next one.
- */
-struct pte {
- struct partition *part_table; /* points into sectorbuffer */
- struct partition *ext_pointer; /* points into sectorbuffer */
- sector_t offset_from_dev_start; /* disk sector number */
- char *sectorbuffer; /* disk sector contents */
-#if ENABLE_FEATURE_FDISK_WRITABLE
- char changed; /* boolean */
-#endif
-};
-
/* DOS partition types */
static const char *const i386_sys_types[] = {
@@ -653,6 +662,8 @@
STATIC_OSF void xbsd_print_disklabel(int);
#include "fdisk_osf.c"
+#include "fdisk_gpt.c"
+
#if ENABLE_FEATURE_SGI_LABEL || ENABLE_FEATURE_SUN_LABEL
static uint16_t
fdisk_swap16(uint16_t x)
@@ -833,6 +844,11 @@
puts("o\tcreate a new empty DOS partition table");
puts("q\tquit without saving changes");
puts("s\tcreate a new empty Sun disklabel"); /* sun */
+ } else if (LABEL_IS_GPT) {
+ puts("o\tcreate a new empty DOS partition table");
+ puts("p\tprint the partition table");
+ puts("q\tquit without saving changes");
+ puts("s\tcreate a new empty Sun disklabel"); /* sun */
} else {
puts("a\ttoggle a bootable flag");
puts("b\tedit bsd disklabel");
@@ -1308,7 +1324,18 @@
/*
* Opens disk_device and optionally reads MBR.
- * FIXME: document what each 'what' value will do!
+ * If what == OPEN_MAIN:
+ * Open device, read MBR. Abort program on short read. Create empty
+ * disklabel if the on-disk structure is invalid (WRITABLE mode).
+ * If what == TRY_ONLY:
+ * Open device, read MBR. Return an error if anything is out of place.
+ * Do not create an empty disklabel. This is used for the "list"
+ * operations: "fdisk -l /dev/sda" and "fdisk -l" (all devices).
+ * If what == CREATE_EMPTY_*:
+ * This means that get_boot() was called recursively from create_*label().
+ * Do not re-open the device; just set up the ptes array and print
+ * geometry warnings.
+ *
* Returns:
* -1: no 0xaa55 flag present (possibly entire disk BSD)
* 0: found or created label
@@ -1390,6 +1417,10 @@
if (check_aix_label())
return 0;
#endif
+#if ENABLE_FEATURE_GPT_LABEL
+ if (check_gpt_label())
+ return 0;
+#endif
#if ENABLE_FEATURE_OSF_LABEL
if (check_osf_label()) {
possibly_osf_label = 1;
@@ -1409,7 +1440,7 @@
if (!valid_part_table_flag(MBRbuffer)) {
if (what == OPEN_MAIN) {
printf("Device contains neither a valid DOS "
- "partition table, nor Sun, SGI or OSF "
+ "partition table, nor Sun, SGI, OSF or GPT "
"disklabel\n");
#ifdef __sparc__
IF_FEATURE_SUN_LABEL(create_sunlabel();)
@@ -2056,10 +2087,14 @@
sun_list_table(xtra);
return;
}
- if (LABEL_IS_SUN) {
+ if (LABEL_IS_SGI) {
sgi_list_table(xtra);
return;
}
+ if (LABEL_IS_GPT) {
+ gpt_list_table(xtra);
+ return;
+ }
list_disk_geometry();