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Staging: hv: Simplify the code for blkvsc_getgeo() 

We are making up the geometry anyway, keep it simple.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
K. Y. Srinivasan 2011-04-22 14:55:07 -07:00 committed by Greg Kroah-Hartman
parent 7b04cd089e
commit ea50245ffa
1 changed files with 11 additions and 73 deletions
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84
drivers/staging/hv/blkvsc_drv.c
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@ -278,82 +278,20 @@ static int blkvsc_open(struct block_device *bdev, fmode_t mode)
static int blkvsc_getgeo(struct block_device *bd, struct hd_geometry *hg)
{
sector_t total_sectors = get_capacity(bd->bd_disk);
sector_t cylinder_times_heads = 0;
sector_t temp = 0;
sector_t nsect = get_capacity(bd->bd_disk);
sector_t cylinders = nsect;
int sectors_per_track = 0;
int heads = 0;
int cylinders = 0;
int rem = 0;
if (total_sectors > (65535 * 16 * 255))
total_sectors = (65535 * 16 * 255);
if (total_sectors >= (65535 * 16 * 63)) {
sectors_per_track = 255;
heads = 16;
cylinder_times_heads = total_sectors;
/* sector_div stores the quotient in cylinder_times_heads */
rem = sector_div(cylinder_times_heads, sectors_per_track);
} else {
sectors_per_track = 17;
cylinder_times_heads = total_sectors;
/* sector_div stores the quotient in cylinder_times_heads */
rem = sector_div(cylinder_times_heads, sectors_per_track);
temp = cylinder_times_heads + 1023;
/* sector_div stores the quotient in temp */
rem = sector_div(temp, 1024);
heads = temp;
if (heads < 4)
heads = 4;
if (cylinder_times_heads >= (heads * 1024) || (heads > 16)) {
sectors_per_track = 31;
heads = 16;
cylinder_times_heads = total_sectors;
/*
* sector_div stores the quotient in
* cylinder_times_heads
*/
rem = sector_div(cylinder_times_heads,
sectors_per_track);
}
if (cylinder_times_heads >= (heads * 1024)) {
sectors_per_track = 63;
heads = 16;
cylinder_times_heads = total_sectors;
/*
* sector_div stores the quotient in
* cylinder_times_heads
*/
rem = sector_div(cylinder_times_heads,
sectors_per_track);
}
}
temp = cylinder_times_heads;
/* sector_div stores the quotient in temp */
rem = sector_div(temp, heads);
cylinders = temp;
hg->heads = heads;
hg->sectors = sectors_per_track;
/*
* We are making up these values; let us keep it simple.
*/
hg->heads = 0xff;
hg->sectors = 0x3f;
sector_div(cylinders, hg->heads * hg->sectors);
hg->cylinders = cylinders;
DPRINT_INFO(BLKVSC_DRV, "CHS (%d, %d, %d)", cylinders, heads,
sectors_per_track);
if ((sector_t)(hg->cylinders + 1) * hg->heads * hg->sectors < nsect)
hg->cylinders = 0xffff;
return 0;
}