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[PATCH] Add block_device_operations.getgeo block device method

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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 <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: <[email protected]>
Cc: Jeff Dike <[email protected]>
Cc: Paolo Giarrusso <[email protected]>
Cc: Bartlomiej Zolnierkiewicz <[email protected]>
Cc: Neil Brown <[email protected]>
Cc: Markus Lidel <[email protected]>
Cc: Russell King <[email protected]>
Cc: David Woodhouse <[email protected]>
Cc: Martin Schwidefsky <[email protected]>
Cc: James Bottomley <[email protected]>
Signed-off-by: Adrian Bunk <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Christoph Hellwig 2006-01-08 01:02:50 -08:00 • committed by Linus Torvalds
commit a885c8c431
30 changed files with 340 additions and 456 deletions
Download patch file Download diff file Expand all files Collapse all files

22
block/ioctl.c
View file

@ -1,6 +1,7 @@
#include <linux/sched.h> /* for capable() */
#include <linux/blkdev.h>
#include <linux/blkpg.h>
#include <linux/hdreg.h>
#include <linux/backing-dev.h>
#include <linux/buffer_head.h>
#include <linux/smp_lock.h>
@ -245,6 +246,27 @@ int blkdev_ioctl(struct inode *inode, struct file *file, unsigned cmd,
set_device_ro(bdev, n);
unlock_kernel();
return 0;
case HDIO_GETGEO: {
struct hd_geometry geo;
if (!arg)
return -EINVAL;
if (!disk->fops->getgeo)
return -ENOTTY;
/*
* We need to set the startsect first, the driver may
* want to override it.
*/
geo.start = get_start_sect(bdev);
ret = disk->fops->getgeo(bdev, &geo);
if (ret)
return ret;
if (copy_to_user((struct hd_geometry __user *)arg, &geo,
sizeof(geo)))
return -EFAULT;
return 0;
}
}
lock_kernel();