[PATCH] Add block_device_operations.getgeo block device method

HDIO_GETGEO is implemented in most block drivers, and all of them have to
duplicate the code to copy the structure to userspace, as well as getting
the start sector.  This patch moves that to common code [1] and adds a
->getgeo method to fill out the raw kernel hd_geometry structure.  For many
drivers this means ->ioctl can go away now.

[1] the s390 block drivers are odd in this respect.  xpram sets ->start
    to 4 always which seems more than odd, and the dasd driver shifts
    the start offset around, probably because of it's non-standard
    sector size.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Jens Axboe <axboe@suse.de>
Cc: <mike.miller@hp.com>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Paolo Giarrusso <blaisorblade@yahoo.it>
Cc: Bartlomiej Zolnierkiewicz <B.Zolnierkiewicz@elka.pw.edu.pl>
Cc: Neil Brown <neilb@cse.unsw.edu.au>
Cc: Markus Lidel <Markus.Lidel@shadowconnect.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: James Bottomley <James.Bottomley@steeleye.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 9 insertions, 16 deletions

diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c
index 339cb12..7f3ff50 100644
--- a/drivers/mtd/mtd_blkdevs.c
+++ b/drivers/mtd/mtd_blkdevs.c
@@ -194,6 +194,14 @@ static int blktrans_release(struct inode *i, struct file *f)
 	return ret;
 }
 
+static int blktrans_getgeo(struct block_device *bdev, struct hd_geometry *geo)
+{
+	struct mtd_blktrans_dev *dev = bdev->bd_disk->private_data;
+
+	if (dev->tr->getgeo)
+		return dev->tr->getgeo(dev, geo);
+	return -ENOTTY;
+}
 
 static int blktrans_ioctl(struct inode *inode, struct file *file,
 			      unsigned int cmd, unsigned long arg)
@@ -207,22 +215,6 @@ static int blktrans_ioctl(struct inode *inode, struct file *file,
 			return tr->flush(dev);
 		/* The core code did the work, we had nothing to do. */
 		return 0;
-
-	case HDIO_GETGEO:
-		if (tr->getgeo) {
-			struct hd_geometry g;
-			int ret;
-
-			memset(&g, 0, sizeof(g));
-			ret = tr->getgeo(dev, &g);
-			if (ret)
-				return ret;
-
-			g.start = get_start_sect(inode->i_bdev);
-			if (copy_to_user((void __user *)arg, &g, sizeof(g)))
-				return -EFAULT;
-			return 0;
-		} /* else */
 	default:
 		return -ENOTTY;
 	}
@@ -233,6 +225,7 @@ struct block_device_operations mtd_blktrans_ops = {
 	.open		= blktrans_open,
 	.release	= blktrans_release,
 	.ioctl		= blktrans_ioctl,
+	.getgeo		= blktrans_getgeo,
 };
 
 int add_mtd_blktrans_dev(struct mtd_blktrans_dev *new)