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-verity.c b/drivers/md/dm-verity.c
index edc624b..ccf4188 100644
--- a/drivers/md/dm-verity.c
+++ b/drivers/md/dm-verity.c
@@ -631,18 +631,17 @@
}
}
-static int verity_ioctl(struct dm_target *ti, unsigned cmd,
- unsigned long arg)
+static int verity_prepare_ioctl(struct dm_target *ti,
+ struct block_device **bdev, fmode_t *mode)
{
struct dm_verity *v = ti->private;
- int r = 0;
+
+ *bdev = v->data_dev->bdev;
if (v->data_start ||
ti->len != i_size_read(v->data_dev->bdev->bd_inode) >> SECTOR_SHIFT)
- r = scsi_verify_blk_ioctl(NULL, cmd);
-
- return r ? : __blkdev_driver_ioctl(v->data_dev->bdev, v->data_dev->mode,
- cmd, arg);
+ return 1;
+ return 0;
}
static int verity_iterate_devices(struct dm_target *ti,
@@ -965,7 +964,7 @@
.dtr = verity_dtr,
.map = verity_map,
.status = verity_status,
- .ioctl = verity_ioctl,
+ .prepare_ioctl = verity_prepare_ioctl,
.iterate_devices = verity_iterate_devices,
.io_hints = verity_io_hints,
};