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[PATCH] dm mpath: support ioctls

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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 <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>
This commit is contained in:
Milan Broz 2006-10-03 01:15:20 -07:00 committed by Linus Torvalds
parent ab17ffa440
commit 9af4aa30b7
1 changed files with 29 additions and 1 deletions
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30
drivers/md/dm-mpath.c
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@ -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)