[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, 19 insertions, 17 deletions

diff --git a/drivers/block/cpqarray.c b/drivers/block/cpqarray.c
index 9bddb6874873..9f0664dd3800 100644
--- a/drivers/block/cpqarray.c
+++ b/drivers/block/cpqarray.c
@@ -160,6 +160,7 @@ static int sendcmd(
 static int ida_open(struct inode *inode, struct file *filep);
 static int ida_release(struct inode *inode, struct file *filep);
 static int ida_ioctl(struct inode *inode, struct file *filep, unsigned int cmd, unsigned long arg);
+static int ida_getgeo(struct block_device *bdev, struct hd_geometry *geo);
 static int ida_ctlr_ioctl(ctlr_info_t *h, int dsk, ida_ioctl_t *io);
 
 static void do_ida_request(request_queue_t *q);
@@ -199,6 +200,7 @@ static struct block_device_operations ida_fops  = {
         .open           = ida_open,
         .release        = ida_release,
         .ioctl          = ida_ioctl,
+        .getgeo         = ida_getgeo,
         .revalidate_disk= ida_revalidate,
 };
 
@@ -1124,6 +1126,23 @@ static void ida_timer(unsigned long tdata)
         h->misc_tflags = 0;
 }
 
+static int ida_getgeo(struct block_device *bdev, struct hd_geometry *geo)
+{
+        drv_info_t *drv = get_drv(bdev->bd_disk);
+
+        if (drv->cylinders) {
+                geo->heads = drv->heads;
+                geo->sectors = drv->sectors;
+                geo->cylinders = drv->cylinders;
+        } else {
+                geo->heads = 0xff;
+                geo->sectors = 0x3f;
+                geo->cylinders = drv->nr_blks / (0xff*0x3f);
+        }
+
+        return 0;
+}
+
 /*
  *  ida_ioctl does some miscellaneous stuff like reporting drive geometry,
  *  setting readahead and submitting commands from userspace to the controller.
@@ -1133,27 +1152,10 @@ static int ida_ioctl(struct inode *inode, struct file *filep, unsigned int cmd,
         drv_info_t *drv = get_drv(inode->i_bdev->bd_disk);
         ctlr_info_t *host = get_host(inode->i_bdev->bd_disk);
         int error;
-        int diskinfo[4];
-        struct hd_geometry __user *geo = (struct hd_geometry __user *)arg;
         ida_ioctl_t __user *io = (ida_ioctl_t __user *)arg;
         ida_ioctl_t *my_io;
 
         switch(cmd) {
-        case HDIO_GETGEO:
-                if (drv->cylinders) {
-                        diskinfo[0] = drv->heads;
-                        diskinfo[1] = drv->sectors;
-                        diskinfo[2] = drv->cylinders;
-                } else {
-                        diskinfo[0] = 0xff;
-                        diskinfo[1] = 0x3f;
-                        diskinfo[2] = drv->nr_blks / (0xff*0x3f);
-                }
-                put_user(diskinfo[0], &geo->heads);
-                put_user(diskinfo[1], &geo->sectors);
-                put_user(diskinfo[2], &geo->cylinders);
-                put_user(get_start_sect(inode->i_bdev), &geo->start);
-                return 0;
         case IDAGETDRVINFO:
                 if (copy_to_user(&io->c.drv, drv, sizeof(drv_info_t)))
                         return -EFAULT;