dm: refactor ioctl handling
This moves the call to blkdev_ioctl and the argument checking to DM core
code, and only leaves a callout to find the block device to operate on
in the targets. This simplifies the code and allows us to pass through
ioctl-like command using other methods in the next patch.
Also split out a helper around calling the prepare_ioctl method that
will be reused for persistent reservation handling.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
diff --git a/drivers/md/dm-flakey.c b/drivers/md/dm-flakey.c
index 645e8b4..09e2afc 100644
--- a/drivers/md/dm-flakey.c
+++ b/drivers/md/dm-flakey.c
@@ -373,20 +373,20 @@
}
}
-static int flakey_ioctl(struct dm_target *ti, unsigned int cmd, unsigned long arg)
+static int flakey_prepare_ioctl(struct dm_target *ti,
+ struct block_device **bdev, fmode_t *mode)
{
struct flakey_c *fc = ti->private;
- struct dm_dev *dev = fc->dev;
- int r = 0;
+
+ *bdev = fc->dev->bdev;
/*
* Only pass ioctls through if the device sizes match exactly.
*/
if (fc->start ||
- ti->len != i_size_read(dev->bdev->bd_inode) >> SECTOR_SHIFT)
- r = scsi_verify_blk_ioctl(NULL, cmd);
-
- return r ? : __blkdev_driver_ioctl(dev->bdev, dev->mode, cmd, arg);
+ ti->len != i_size_read((*bdev)->bd_inode) >> SECTOR_SHIFT)
+ return 1;
+ return 0;
}
static int flakey_iterate_devices(struct dm_target *ti, iterate_devices_callout_fn fn, void *data)
@@ -405,7 +405,7 @@
.map = flakey_map,
.end_io = flakey_end_io,
.status = flakey_status,
- .ioctl = flakey_ioctl,
+ .prepare_ioctl = flakey_prepare_ioctl,
.iterate_devices = flakey_iterate_devices,
};