Commit 9af4aa30 authored by Milan Broz's avatar Milan Broz Committed by Linus Torvalds
Browse files

[PATCH] dm mpath: support ioctls 



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: default avatarMilan Broz <mbroz@redhat.com>
Signed-off-by: default avatarAlasdair G Kergon <agk@redhat.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent ab17ffa4

drivers/md/dm-mpath.c

+29 −1
Original line number Diff line number Diff line
@@ -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_target = { 
	.resume = multipath_resume,

	.status = multipath_status,

	.message = multipath_message,

	.ioctl  = multipath_ioctl,

};



static int __init dm_multipath_init(void)

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