From: Milan Broz When an ioctl is performed on a multipath device simply pass it on to the underlying block device through current_path. If current path is not yet selected, select it. Signed-off-by: Milan Broz Signed-off-by: Alasdair G Kergon Signed-off-by: Andrew Morton --- drivers/md/dm-mpath.c | 30 +++++++++++++++++++++++++++++- 1 file changed, 29 insertions(+), 1 deletion(-) diff -puN drivers/md/dm-mpath.c~dm-mpath-support-ioctls drivers/md/dm-mpath.c --- a/drivers/md/dm-mpath.c~dm-mpath-support-ioctls +++ a/drivers/md/dm-mpath.c @@ -1266,12 +1266,39 @@ error: return -EINVAL; } +static int multipath_ioctl(struct dm_target *ti, struct inode *inode, + struct file *filp, unsigned int cmd, + unsigned long arg) +{ + struct multipath *m = (struct multipath *) ti->private; + struct block_device *bdev = NULL; + unsigned long flags; + int r = 0; + + spin_lock_irqsave(&m->lock, flags); + + if (!m->current_pgpath) + __choose_pgpath(m); + + if (m->current_pgpath) + bdev = m->current_pgpath->path.dev->bdev; + + if (m->queue_io) + r = -EAGAIN; + else if (!bdev) + r = -EIO; + + spin_unlock_irqrestore(&m->lock, flags); + + return r ? : blkdev_ioctl(bdev->bd_inode, filp, cmd, arg); +} + /*----------------------------------------------------------------- * Module setup *---------------------------------------------------------------*/ static struct target_type multipath_target = { .name = "multipath", - .version = {1, 0, 4}, + .version = {1, 0, 5}, .module = THIS_MODULE, .ctr = multipath_ctr, .dtr = multipath_dtr, @@ -1281,6 +1308,7 @@ static struct target_type multipath_targ .resume = multipath_resume, .status = multipath_status, .message = multipath_message, + .ioctl = multipath_ioctl, }; static int __init dm_multipath_init(void) _