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authorPaolo Bonzini <pbonzini@redhat.com>2012-01-12 16:01:29 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2012-01-14 15:07:24 -0800
commitec8013beddd717d1740cfefb1a9b900deef85462 (patch)
tree7aa28de51cb2f375baf6fe943afd85e75ca7bcb9 /drivers/md/dm-mpath.c
parent0bfc96cb77224736dfa35c3c555d37b3646ef35e (diff)
downloadop-kernel-dev-ec8013beddd717d1740cfefb1a9b900deef85462.zip
op-kernel-dev-ec8013beddd717d1740cfefb1a9b900deef85462.tar.gz
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.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
index 5e0090e..801d92d 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);
}
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