From: kaf24@firebug.cl.cam.ac.uk <kaf24@firebug.cl.cam.ac.uk>
Date: Fri, 2 Jun 2006 11:13:34 +0000 (+0100)
Subject: Add backing support for HDIO_GETGEO ioctl to blkfront.
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~15972^2~49^2~20
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=413629e69f0b7941568ca81715b37763e6a4be24;p=xen.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>
---

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 a61b0765d4..d7d408082a 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 7ffd68b3b7..91f152dacf 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 efa396142a..8aa453d3a0 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
 };
 
 DEFINE_SPINLOCK(blkif_io_lock);