* cciss update [4/8] cylinder calculation fix
@ 2004-08-10 16:07 mikem
0 siblings, 0 replies; only message in thread
From: mikem @ 2004-08-10 16:07 UTC (permalink / raw)
To: akpm, axboe; +Cc: linux-kernel
Patch 4 of 8
This patch fixes our cylinder calculations. Without his fix the number
of cylinders maxes out at 65535.
Aplies against 2.6.8-rc4. Please apply patches in order.
Thanks,
mikem
-------------------------------------------------------------------------------
diff -burpN lx268-rc3-p003/drivers/block/cciss.c lx268-rc3/drivers/block/cciss.c
--- lx268-rc3-p003/drivers/block/cciss.c 2004-08-05 10:40:00.865910000 -0500
+++ lx268-rc3/drivers/block/cciss.c 2004-08-05 11:16:03.222182640 -0500
@@ -1470,6 +1470,8 @@ static void cciss_geometry_inquiry(int c
drv->sectors = 32; // Sectors per track
drv->cylinders = total_size / 255 / 32;
} else {
+ unsigned int t;
+
drv->block_size = block_size;
drv->nr_blocks = total_size;
drv->heads = inq_buff->data_byte[6];
@@ -1477,6 +1479,10 @@ static void cciss_geometry_inquiry(int c
drv->cylinders = (inq_buff->data_byte[4] & 0xff) << 8;
drv->cylinders += inq_buff->data_byte[5];
drv->raid_level = inq_buff->data_byte[8];
+ t = drv->heads * drv->sectors;
+ if (t > 1) {
+ drv->cylinders = total_size/t;
+ }
}
} else { /* Get geometry failed */
printk(KERN_WARNING "cciss: reading geometry failed, "
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2004-08-10 16:07 cciss update [4/8] cylinder calculation fix mikem
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