From a11a914060471392c91a7f92fc334df220abdf64 Mon Sep 17 00:00:00 2001 From: Paolo Bonzini Date: Thu, 12 Jan 2012 16:01:29 +0100 Subject: [PATCH] dm: do not forward ioctls from logical volumes to the underlying device commit ec8013beddd717d1740cfefb1a9b900deef85462 upstream. A logical volume can map to just part of underlying physical volume. In this case, it must be treated like a partition. Based on a patch from Alasdair G Kergon. Cc: Alasdair G Kergon Cc: dm-devel@redhat.com Signed-off-by: Paolo Bonzini Signed-off-by: Linus Torvalds [PG: drop drivers/md/dm-flakey.c chunk; file not present in 2.6.34] Signed-off-by: Paul Gortmaker --- drivers/md/dm-linear.c | 12 +++++++++++- drivers/md/dm-mpath.c | 6 ++++++ 2 files changed, 17 insertions(+), 1 deletion(-) diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c index 9200dbf2391a7..bf404845aa9d3 100644 --- a/drivers/md/dm-linear.c +++ b/drivers/md/dm-linear.c @@ -115,7 +115,17 @@ static int linear_ioctl(struct dm_target *ti, unsigned int cmd, unsigned long arg) { struct linear_c *lc = (struct linear_c *) ti->private; - return __blkdev_driver_ioctl(lc->dev->bdev, lc->dev->mode, cmd, arg); + struct dm_dev *dev = lc->dev; + int r = 0; + + /* + * Only pass ioctls through if the device sizes match exactly. + */ + if (lc->start || + ti->len != i_size_read(dev->bdev->bd_inode) >> SECTOR_SHIFT) + r = scsi_verify_blk_ioctl(NULL, cmd); + + return r ? : __blkdev_driver_ioctl(dev->bdev, dev->mode, cmd, arg); } static int linear_merge(struct dm_target *ti, struct bvec_merge_data *bvm, diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c index 78090ebaba6cd..3c06fdb138686 100644 --- a/drivers/md/dm-mpath.c +++ b/drivers/md/dm-mpath.c @@ -1541,6 +1541,12 @@ static int multipath_ioctl(struct dm_target *ti, unsigned int cmd, spin_unlock_irqrestore(&m->lock, flags); + /* + * Only pass ioctls through if the device sizes match exactly. + */ + if (!r && ti->len != i_size_read(bdev->bd_inode) >> SECTOR_SHIFT) + r = scsi_verify_blk_ioctl(NULL, cmd); + return r ? : __blkdev_driver_ioctl(bdev, mode, cmd, arg); } -- 2.47.2