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-mpath.c | |
| parent | 0bfc96cb77224736dfa35c3c555d37b3646ef35e (diff) | |
| download | lwn-ec8013beddd717d1740cfefb1a9b900deef85462.tar.gz lwn-ec8013beddd717d1740cfefb1a9b900deef85462.zip | |
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-mpath.c')
| -rw-r--r-- | drivers/md/dm-mpath.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c index 5e0090ef4182..801d92d237cf 100644 --- a/drivers/md/dm-mpath.c +++ b/drivers/md/dm-mpath.c @@ -1520,6 +1520,12 @@ 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); } |