[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, 8 insertions, 17 deletions

diff --git a/drivers/block/ps2esdi.c b/drivers/block/ps2esdi.c
index 29d1518be72a..43415f69839f 100644
--- a/drivers/block/ps2esdi.c
+++ b/drivers/block/ps2esdi.c
@@ -81,8 +81,7 @@ static void (*current_int_handler) (u_int) = NULL;
 static void ps2esdi_normal_interrupt_handler(u_int);
 static void ps2esdi_initial_reset_int_handler(u_int);
 static void ps2esdi_geometry_int_handler(u_int);
-static int ps2esdi_ioctl(struct inode *inode, struct file *file,
-			 u_int cmd, u_long arg);
+static int ps2esdi_getgeo(struct block_device *bdev, struct hd_geometry *geo);
 
 static int ps2esdi_read_status_words(int num_words, int max_words, u_short * buffer);
 
@@ -132,7 +131,7 @@ static struct ps2esdi_i_struct ps2esdi_info[MAX_HD] =
 static struct block_device_operations ps2esdi_fops =
 {
 	.owner		= THIS_MODULE,
-	.ioctl		= ps2esdi_ioctl,
+	.getgeo		= ps2esdi_getgeo,
 };
 
 static struct gendisk *ps2esdi_gendisk[2];
@@ -1058,21 +1057,13 @@ static void dump_cmd_complete_status(u_int int_ret_code)
 
 }
 
-static int ps2esdi_ioctl(struct inode *inode,
-			 struct file *file, u_int cmd, u_long arg)
+static int ps2esdi_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 {
-	struct ps2esdi_i_struct *p = inode->i_bdev->bd_disk->private_data;
-	struct ps2esdi_geometry geom;
-
-	if (cmd != HDIO_GETGEO)
-		return -EINVAL;
-	memset(&geom, 0, sizeof(geom));
-	geom.heads = p->head;
-	geom.sectors = p->sect;
-	geom.cylinders = p->cyl;
-	geom.start = get_start_sect(inode->i_bdev);
-	if (copy_to_user((void __user *)arg, &geom, sizeof(geom)))
-		return -EFAULT;
+	struct ps2esdi_i_struct *p = bdev->bd_disk->private_data;
+
+	geo->heads = p->head;
+	geo->sectors = p->sect;
+	geo->cylinders = p->cyl;
 	return 0;
 }