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Staging: hv: storvsc_drv: Simplify the code for getting the drive parameters 

We are making up the drive parameters; simplify the code.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Abhishek Kane <v-abkane@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 2011-05-10 07:54:52 -07:00 committed by Greg Kroah-Hartman
parent 6f64e5ffb9
commit 5326fd5cc3
1 changed files with 15 additions and 69 deletions
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84
drivers/staging/hv/storvsc_drv.c
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@ -381,79 +381,25 @@ static int storvsc_remove(struct hv_device *dev)
static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev,
sector_t capacity, int *info)
{
sector_t total_sectors = capacity;
sector_t cylinder_times_heads = 0;
sector_t temp = 0;
sector_t nsect = capacity;
sector_t cylinders = nsect;
int heads, sectors_pt;
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;
/*
* We are making up these values; let us keep it simple.
*/
heads = 0xff;
sectors_pt = 0x3f; /* Sectors per track */
sector_div(cylinders, heads * sectors_pt);
if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect)
cylinders = 0xffff;
info[0] = heads;
info[1] = sectors_per_track;
info[2] = cylinders;
info[1] = sectors_pt;
info[2] = (int)cylinders;
DPRINT_INFO(STORVSC_DRV, "CHS (%d, %d, %d)", cylinders, heads,
sectors_per_track);
DPRINT_INFO(STORVSC_DRV, "CHS (%d, %d, %d)", (int)cylinders, heads,
sectors_pt);
return 0;
}