diff options
| author | Paolo Bonzini <pbonzini@redhat.com> | 2012-01-12 16:01:29 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-01-14 15:07:24 -0800 |
| commit | ec8013beddd717d1740cfefb1a9b900deef85462 (patch) | |
| tree | 7aa28de51cb2f375baf6fe943afd85e75ca7bcb9 /drivers/md/dm-linear.c | |
| parent | 0bfc96cb77224736dfa35c3c555d37b3646ef35e (diff) | |
dm: do not forward ioctls from logical volumes to the underlying device
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 <agk@redhat.com>
Cc: dm-devel@redhat.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/md/dm-linear.c')
| -rw-r--r-- | drivers/md/dm-linear.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c index 3921e3bb43c1..9728839f844a 100644 --- a/drivers/md/dm-linear.c +++ b/drivers/md/dm-linear.c @@ -116,7 +116,17 @@ 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, |