[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, 6 insertions, 19 deletions

diff --git a/drivers/mmc/mmc_block.c b/drivers/mmc/mmc_block.c
index 198561d..d5f2898 100644
--- a/drivers/mmc/mmc_block.c
+++ b/drivers/mmc/mmc_block.c
@@ -113,31 +113,18 @@ static int mmc_blk_release(struct inode *inode, struct file *filp)
 }
 
 static int
-mmc_blk_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg)
+mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 {
-	struct block_device *bdev = inode->i_bdev;
-
-	if (cmd == HDIO_GETGEO) {
-		struct hd_geometry geo;
-
-		memset(&geo, 0, sizeof(struct hd_geometry));
-
-		geo.cylinders	= get_capacity(bdev->bd_disk) / (4 * 16);
-		geo.heads	= 4;
-		geo.sectors	= 16;
-		geo.start	= get_start_sect(bdev);
-
-		return copy_to_user((void __user *)arg, &geo, sizeof(geo))
-			? -EFAULT : 0;
-	}
-
-	return -ENOTTY;
+	geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
+	geo->heads = 4;
+	geo->sectors = 16;
+	return 0;
 }
 
 static struct block_device_operations mmc_bdops = {
 	.open			= mmc_blk_open,
 	.release		= mmc_blk_release,
-	.ioctl			= mmc_blk_ioctl,
+	.getgeo			= mmc_blk_getgeo,
 	.owner			= THIS_MODULE,
 };