[PATCH] blkfront: ioctls/geometry, 2.6

[Pascal Bouchareine <pascal@gandi.net>]

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Hi,

Adds HDIO_GETGEO, BLKGETSIZE, BLKGETSIZE64 support to blkfront.

An attempt to merge in the following sent previously by Ian Pratt :
http://lists.xensource.com/archives/html/xen-devel/2005-01/msg00659.html

Taking into account the block_device_operations for get_geom.

Regards,
Pascal

-- 
\o/   Pascal Bouchareine - Gandi 
 g    0170393757           15, place de la Nation - 75011 Paris      

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Signed-off-by: Pascal Bouchareine <pascal@gandi.net>

diff -ru xen-unstable.hg/linux-2.6-xen-sparse/drivers/xen/blkfront/blkfront.c xen-unstable.hg.new/linux-2.6-xen-sparse/drivers/xen/blkfront/blkfront.c
--- xen-unstable.hg/linux-2.6-xen-sparse/drivers/xen/blkfront/blkfront.c	Sun Apr 30 13:36:52 2006
+++ xen-unstable.hg.new/linux-2.6-xen-sparse/drivers/xen/blkfront/blkfront.c	Mon May 15 20:01:07 2006
@@ -424,7 +424,6 @@
 	return 0;
 }
 
-
 int blkif_release(struct inode *inode, struct file *filep)
 {
 	struct blkfront_info *info = inode->i_bdev->bd_disk->private_data;
@@ -442,19 +441,46 @@
 	return 0;
 }
 
+int blkif_getgeo(struct block_device *bdev, struct hd_geometry *geo)
+{
+	struct gendisk *gd;
+	struct hd_struct *part;
+	int    dpart;
+
+	DPRINTK_IOCTL("blkif ioctl(HDIO_GETGEO)\n");
+	gd = bdev->bd_disk;
+
+	geo->start = 0x00;
+	geo->heads = 0xff;
+	geo->sectors = 0x3f;
+	geo->cylinders = (gd->capacity >> 14) + (geo->heads + geo->sectors + 1);
+		
+	return 0;
+}
 
 int blkif_ioctl(struct inode *inode, struct file *filep,
                 unsigned command, unsigned long argument)
 {
-	int i;
+	dev_t dev = inode->i_rdev;
+	struct gendisk *gd;
+	struct hd_struct *part;
+	int i, num, dpart;
 
 	DPRINTK_IOCTL("command: 0x%x, argument: 0x%lx, dev: 0x%04x\n",
 		      command, (long)argument, inode->i_rdev);
 
+	gd = get_gendisk(dev, &dpart);
+	part = gd->part[MINOR(dev)];
+
 	switch (command) {
-	case HDIO_GETGEO:
-		/* return ENOSYS to use defaults */
-		return -ENOSYS;
+	case BLKGETSIZE:
+		DPRINTK_IOCTL(" BLKGETSIZE: %x %lx\n", BLKGETSIZE, part->nr_sects);
+		return put_user(part->nr_sects, (unsigned long *) argument);
+
+	case BLKGETSIZE64:
+		DPRINTK_IOCTL(" BLKGETSIZE64: %x %lx\n", BLKGETSIZE64, 
+			(u64)part->nr_sects * 512);
+		return put_user((u64)part->nr_sects * 512, (u64 *) argument);
 
 	case CDROMMULTISESSION:
 		DPRINTK("FIXME: support multisession CDs later\n");
diff -ru xen-unstable.hg/linux-2.6-xen-sparse/drivers/xen/blkfront/block.h xen-unstable.hg.new/linux-2.6-xen-sparse/drivers/xen/blkfront/block.h
--- xen-unstable.hg/linux-2.6-xen-sparse/drivers/xen/blkfront/block.h	Sun Apr 30 13:36:52 2006
+++ xen-unstable.hg.new/linux-2.6-xen-sparse/drivers/xen/blkfront/block.h	Mon May 15 15:57:58 2006
@@ -138,6 +138,7 @@
 
 extern int blkif_open(struct inode *inode, struct file *filep);
 extern int blkif_release(struct inode *inode, struct file *filep);
+extern int blkif_getgeo(struct block_device *bdev, struct hd_geometry *geo);
 extern int blkif_ioctl(struct inode *inode, struct file *filep,
                        unsigned command, unsigned long argument);
 extern int blkif_check(dev_t dev);
diff -ru xen-unstable.hg/linux-2.6-xen-sparse/drivers/xen/blkfront/vbd.c xen-unstable.hg.new/linux-2.6-xen-sparse/drivers/xen/blkfront/vbd.c
--- xen-unstable.hg/linux-2.6-xen-sparse/drivers/xen/blkfront/vbd.c	Sun Apr 30 13:36:52 2006
+++ xen-unstable.hg.new/linux-2.6-xen-sparse/drivers/xen/blkfront/vbd.c	Mon May 15 15:57:58 2006
@@ -91,6 +91,7 @@
 	.open = blkif_open,
 	.release = blkif_release,
 	.ioctl  = blkif_ioctl,
+	.getgeo  = blkif_getgeo,
 };
 
 spinlock_t blkif_io_lock = SPIN_LOCK_UNLOCKED;

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