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device_geometry.c
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device_geometry.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <inttypes.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <linux/types.h>
#include "libgfs2.h"
/**
* device_geometry - Get the size of a device
* @w: the command line
*
*/
void
device_geometry(struct gfs2_sbd *sdp)
{
struct device *device = &sdp->device;
uint64_t bytes;
int error;
error = device_size(sdp->device_fd, &bytes);
if (error)
die("can't determine size of %s: %s\n",
sdp->device_name, strerror(errno));
if (sdp->debug)
printf("\nPartition size = %"PRIu64"\n",
bytes >> GFS2_BASIC_BLOCK_SHIFT);
device->start = 0;
device->length = bytes >> GFS2_BASIC_BLOCK_SHIFT;
}
/**
* fix_device_geometry - round off address and lengths and convert to FS blocks
* @w: the command line
*
*/
void
fix_device_geometry(struct gfs2_sbd *sdp)
{
struct device *device = &sdp->device;
unsigned int bbsize = sdp->bsize >> GFS2_BASIC_BLOCK_SHIFT;
uint64_t start, length;
unsigned int remainder;
if (sdp->debug) {
printf("\nDevice Geometry: (in basic blocks)\n");
printf(" start = %"PRIu64", length = %"PRIu64", rgf_flags = 0x%.8X\n",
device->start,
device->length,
device->rgf_flags);
}
start = device->start;
length = device->length;
if (length < 1 << (20 - GFS2_BASIC_BLOCK_SHIFT))
die("device is way too small (%"PRIu64" bytes)\n",
length << GFS2_BASIC_BLOCK_SHIFT);
remainder = start % bbsize;
if (remainder) {
length -= bbsize - remainder;
start += bbsize - remainder;
}
start /= bbsize;
length /= bbsize;
device->start = start;
device->length = length;
sdp->device_size = start + length;
if (sdp->debug) {
printf("\nDevice Geometry: (in FS blocks)\n");
printf(" start = %"PRIu64", length = %"
PRIu64", rgf_flags = 0x%.8X\n",
device->start, device->length, device->rgf_flags);
printf("\nDevice Size: %"PRIu64"\n", sdp->device_size);
}
}

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