[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, 12 insertions, 9 deletions

diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
index 73f9652b2ee9..3a93c6f772fa 100644
--- a/arch/um/drivers/ubd_kern.c
+++ b/arch/um/drivers/ubd_kern.c
@@ -117,6 +117,7 @@ static int ubd_open(struct inode * inode, struct file * filp);
 static int ubd_release(struct inode * inode, struct file * file);
 static int ubd_ioctl(struct inode * inode, struct file * file,
                      unsigned int cmd, unsigned long arg);
+static int ubd_getgeo(struct block_device *bdev, struct hd_geometry *geo);
 
 #define MAX_DEV (8)
 
@@ -125,6 +126,7 @@ static struct block_device_operations ubd_blops = {
         .open           = ubd_open,
         .release        = ubd_release,
         .ioctl          = ubd_ioctl,
+        .getgeo         = ubd_getgeo,
 };
 
 /* Protected by the queue_lock */
@@ -1058,6 +1060,16 @@ static void do_ubd_request(request_queue_t *q)
         }
 }
 
+static int ubd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
+{
+        struct ubd *dev = bdev->bd_disk->private_data;
+
+        geo->heads = 128;
+        geo->sectors = 32;
+        geo->cylinders = dev->size / (128 * 32 * 512);
+        return 0;
+}
+
 static int ubd_ioctl(struct inode * inode, struct file * file,
                      unsigned int cmd, unsigned long arg)
 {
@@ -1070,16 +1082,7 @@ static int ubd_ioctl(struct inode * inode, struct file * file,
         };
 
         switch (cmd) {
-                struct hd_geometry g;
                 struct cdrom_volctrl volume;
-        case HDIO_GETGEO:
-                if(!loc) return(-EINVAL);
-                g.heads = 128;
-                g.sectors = 32;
-                g.cylinders = dev->size / (128 * 32 * 512);
-                g.start = get_start_sect(inode->i_bdev);
-                return(copy_to_user(loc, &g, sizeof(g)) ? -EFAULT : 0);
-
         case HDIO_GET_IDENTITY:
                 ubd_id.cyls = dev->size / (128 * 32 * 512);
                 if(copy_to_user((char __user *) arg, (char *) &ubd_id,