[PATCH] dm linear: support ioctls

When an ioctl is performed on a device with a linear target, simply pass it on
to the underlying block device.

Note that the ioctl will pass through the filtering in blkdev_ioctl() twice.

Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 12 insertions, 1 deletions

diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c
index 47b3c62bbdb8..c58f072ccae6 100644
--- a/drivers/md/dm-linear.c
+++ b/drivers/md/dm-linear.c
@@ -98,14 +98,25 @@ static int linear_status(struct dm_target *ti, status_type_t type,
         return 0;
 }
 
+static int linear_ioctl(struct dm_target *ti, struct inode *inode,
+                        struct file *filp, unsigned int cmd,
+                        unsigned long arg)
+{
+        struct linear_c *lc = (struct linear_c *) ti->private;
+        struct block_device *bdev = lc->dev->bdev;
+
+        return blkdev_ioctl(bdev->bd_inode, filp, cmd, arg);
+}
+
 static struct target_type linear_target = {
         .name   = "linear",
-        .version= {1, 0, 1},
+        .version= {1, 0, 2},
         .module = THIS_MODULE,
         .ctr    = linear_ctr,
         .dtr    = linear_dtr,
         .map    = linear_map,
         .status = linear_status,
+        .ioctl  = linear_ioctl,
 };
 
 int __init dm_linear_init(void)