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fdisk: add total sectors 

Add the total_sectors variable to the context structure. This is the initial
geometry information.

Signed-off-by: Davidlohr Bueso <dave@gnu.org>
This commit is contained in:
Davidlohr Bueso 2012-06-03 20:15:20 +02:00 committed by Karel Zak
parent e53ced85bf
commit 618882d609
4 changed files with 26 additions and 16 deletions
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21
fdisk/fdisk.c
View File

@ -145,7 +145,6 @@ unsigned int heads,
units_per_sector = 1,
display_in_cyl_units = 0;
sector_t total_number_of_sectors; /* in logical sectors */
unsigned long grain = DEFAULT_SECTOR_SIZE;
enum labeltype disklabel; /* Current disklabel */
@ -400,8 +399,8 @@ void update_units(void)
void warn_limits(struct fdisk_context *cxt)
{
if (total_number_of_sectors > UINT_MAX && !nowarn) {
unsigned long long bytes = total_number_of_sectors * cxt->sector_size;
if (cxt->total_sectors > UINT_MAX && !nowarn) {
unsigned long long bytes = cxt->total_sectors * cxt->sector_size;
int giga = bytes / 1000000000;
int hectogiga = (giga + 50) / 100;
@ -509,7 +508,7 @@ update_sector_offset(struct fdisk_context *cxt)
sector_offset = x / cxt->sector_size;
/* don't use huge offset on small devices */
if (total_number_of_sectors <= sector_offset * 4)
if (cxt->total_sectors <= sector_offset * 4)
sector_offset = cxt->phy_sector_size / cxt->sector_size;
/* use 1MiB grain always when possible */
@ -517,7 +516,7 @@ update_sector_offset(struct fdisk_context *cxt)
grain = 2048 * 512;
/* don't use huge grain on small devices */
if (total_number_of_sectors <= (grain * 4 / cxt->sector_size))
if (cxt->total_sectors <= (grain * 4 / cxt->sector_size))
grain = cxt->phy_sector_size;
}
}
@ -540,13 +539,9 @@ get_geometry(struct fdisk_context *cxt, struct geom *g) {
pt_sectors ? pt_sectors :
kern_sectors ? kern_sectors : 63;
/* get number of 512-byte sectors, and convert it the real sectors */
if (blkdev_get_sectors(cxt->dev_fd, &nsects) == 0)
total_number_of_sectors = (nsects / (cxt->sector_size >> 9));
update_sector_offset(cxt);
llcyls = total_number_of_sectors / (heads * sectors);
llcyls = cxt->total_sectors / (heads * sectors);
cylinders = llcyls;
if (cylinders != llcyls) /* truncated? */
cylinders = ~0;
@ -1146,7 +1141,7 @@ check_alignment(struct fdisk_context *cxt, sector_t lba, int partition)
static void
list_disk_geometry(struct fdisk_context *cxt) {
unsigned long long bytes = total_number_of_sectors * cxt->sector_size;
unsigned long long bytes = cxt->total_sectors * cxt->sector_size;
long megabytes = bytes/1000000;
if (megabytes < 10000)
@ -1160,7 +1155,7 @@ list_disk_geometry(struct fdisk_context *cxt) {
printf(_("%d heads, %llu sectors/track, %d cylinders"),
heads, sectors, cylinders);
if (units_per_sector == 1)
printf(_(", total %llu sectors"), total_number_of_sectors);
printf(_(", total %llu sectors"), cxt->total_sectors);
printf("\n");
printf(_("Units = %s of %d * %ld = %ld bytes\n"),
str_units(PLURAL),
@ -1468,7 +1463,7 @@ check(int n, unsigned int h, unsigned int s, unsigned int c,
static void
verify(struct fdisk_context *cxt) {
int i, j;
sector_t total = 1, n_sectors = total_number_of_sectors;
sector_t total = 1, n_sectors = cxt->total_sectors;
unsigned long long first[partitions], last[partitions];
struct partition *p;

5
fdisk/fdisk.h
View File

@ -112,6 +112,9 @@ struct fdisk_context {
unsigned long phy_sector_size; /* physical size */
unsigned long sector_size; /* logical size */
unsigned long alignment_offset;
/* geometry */
sector_t total_sectors; /* in logical sectors */
};
extern struct fdisk_context *fdisk_new_context_from_filename(const char *fname, int readonly);
@ -181,8 +184,8 @@ extern enum labeltype disklabel;
*/
extern unsigned char *MBRbuffer;
extern int MBRbuffer_changed;
extern sector_t total_number_of_sectors;
extern unsigned long grain;
/* start_sect and nr_sects are stored little endian on all machines */
/* moreover, they are not aligned correctly */
static inline void

4
fdisk/fdiskdoslabel.c
View File

@ -449,10 +449,10 @@ void dos_add_partition(struct fdisk_context *cxt, int n, int sys)
fill_bounds(first, last);
if (n < 4) {
start = sector_offset;
if (display_in_cyl_units || !total_number_of_sectors)
if (display_in_cyl_units || !cxt->total_sectors)
limit = heads * sectors * cylinders - 1;
else
limit = total_number_of_sectors - 1;
limit = cxt->total_sectors - 1;
if (limit > UINT_MAX)
limit = UINT_MAX;

12
fdisk/utils.c
View File

@ -40,6 +40,16 @@ static unsigned long __get_sector_size(int fd)
return DEFAULT_SECTOR_SIZE;
}
static int __discover_geometry(struct fdisk_context *cxt)
{
sector_t nsects;
/* get number of 512-byte sectors, and convert it the real sectors */
if (!blkdev_get_sectors(cxt->dev_fd, &nsects))
cxt->total_sectors = (nsects / (cxt->sector_size >> 9));
return 0;
}
static int __discover_topology(struct fdisk_context *cxt)
{
#ifdef HAVE_LIBBLKID
@ -151,7 +161,9 @@ struct fdisk_context *fdisk_new_context_from_filename(const char *fname, int rea
cxt->dev_path = strdup(fname);
if (!cxt->dev_path)
goto fail;
__discover_topology(cxt);
__discover_geometry(cxt);
DBG(CONTEXT, dbgprint("context initialized for %s [%s]",
fname, readonly ? "READ-ONLY" : "READ-WRITE"));