From: kaf24@firebug.cl.cam.ac.uk <kaf24@firebug.cl.cam.ac.uk>
Date: Fri, 2 Jun 2006 11:15:49 +0000 (+0100)
Subject: Add backing support for HDIO_GETGEO ioctl to blkfront.
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=ab64d70c30fea63b68b95ba9f4456009b180b8bc;p=people%2Fvhanquez%2Fxen.git

Add backing support for HDIO_GETGEO ioctl to blkfront.
Inspired by an earlier patch from Charles Coffing.
Signed-Off-By: Jan Beulich <jbeulich@novell.com>
xen-unstable changeset:   10258:bcc2c9ea60d83e26940985d0e840d101e260ee57
xen-unstable date:        Fri Jun  2 12:13:34 2006 +0100
---

diff --git a/linux-2.6-xen-sparse/drivers/xen/blkfront/blkfront.c b/linux-2.6-xen-sparse/drivers/xen/blkfront/blkfront.c
index 57b5c2759..8a5ec33b1 100644
--- a/linux-2.6-xen-sparse/drivers/xen/blkfront/blkfront.c
+++ b/linux-2.6-xen-sparse/drivers/xen/blkfront/blkfront.c
@@ -452,10 +452,6 @@ int blkif_ioctl(struct inode *inode, struct file *filep,
 		      command, (long)argument, inode->i_rdev);
 
 	switch (command) {
-	case HDIO_GETGEO:
-		/* return ENOSYS to use defaults */
-		return -ENOSYS;
-
 	case CDROMMULTISESSION:
 		DPRINTK("FIXME: support multisession CDs later\n");
 		for (i = 0; i < sizeof(struct cdrom_multisession); i++)
@@ -473,6 +469,23 @@ int blkif_ioctl(struct inode *inode, struct file *filep,
 }
 
 
+int blkif_getgeo(struct block_device *bd, struct hd_geometry *hg)
+{
+	/* We don't have real geometry info, but let's at least return
+	   values consistent with the size of the device */
+	sector_t nsect = get_capacity(bd->bd_disk);
+	sector_t cylinders = nsect;
+
+	hg->heads = 0xff;
+	hg->sectors = 0x3f;
+	sector_div(cylinders, hg->heads * hg->sectors);
+	hg->cylinders = cylinders;
+	if ((sector_t)(hg->cylinders + 1) * hg->heads * hg->sectors < nsect)
+		hg->cylinders = 0xffff;
+	return 0;
+}
+
+
 /*
  * blkif_queue_request
  *
diff --git a/linux-2.6-xen-sparse/drivers/xen/blkfront/block.h b/linux-2.6-xen-sparse/drivers/xen/blkfront/block.h
index 7ffd68b3b..91f152dac 100644
--- a/linux-2.6-xen-sparse/drivers/xen/blkfront/block.h
+++ b/linux-2.6-xen-sparse/drivers/xen/blkfront/block.h
@@ -140,6 +140,7 @@ extern int blkif_open(struct inode *inode, struct file *filep);
 extern int blkif_release(struct inode *inode, struct file *filep);
 extern int blkif_ioctl(struct inode *inode, struct file *filep,
                        unsigned command, unsigned long argument);
+extern int blkif_getgeo(struct block_device *, struct hd_geometry *);
 extern int blkif_check(dev_t dev);
 extern int blkif_revalidate(dev_t dev);
 extern void do_blkif_request (request_queue_t *rq);
diff --git a/linux-2.6-xen-sparse/drivers/xen/blkfront/vbd.c b/linux-2.6-xen-sparse/drivers/xen/blkfront/vbd.c
index 81d9c7fb8..7b68f45ff 100644
--- a/linux-2.6-xen-sparse/drivers/xen/blkfront/vbd.c
+++ b/linux-2.6-xen-sparse/drivers/xen/blkfront/vbd.c
@@ -91,6 +91,7 @@ static struct block_device_operations xlvbd_block_fops =
 	.open = blkif_open,
 	.release = blkif_release,
 	.ioctl  = blkif_ioctl,
+	.getgeo = blkif_getgeo
 };
 
 spinlock_t blkif_io_lock = SPIN_LOCK_UNLOCKED;