diff options
| author | Paolo Bonzini <pbonzini@redhat.com> | 2012-01-17 04:07:31 +0000 |
|---|---|---|
| committer | Willy Tarreau <w@1wt.eu> | 2012-02-11 15:40:56 +0100 |
| commit | 8eca6dc41431c18b75ccdc2f04df589ddca4e0dc (patch) | |
| tree | 35e76d68e0b01d40f02559dd5730fce993b23111 | |
| parent | 4d6fe88a64e3bbaf5df110044af3046a41c3f37b (diff) | |
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 <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>
[bwh: Backport to 2.6.32 - drop change to drivers/md/dm-flakey.c]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Willy Tarreau <w@1wt.eu>
| -rw-r--r-- | drivers/md/dm-linear.c | 10 | ||||
| -rw-r--r-- | drivers/md/dm-mpath.c | 6 |
2 files changed, 15 insertions, 1 deletions
diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c index 6449bcdf84c..14417baea44 100644 --- a/drivers/md/dm-linear.c +++ b/drivers/md/dm-linear.c @@ -118,12 +118,20 @@ static int linear_ioctl(struct dm_target *ti, struct inode *inode, struct block_device *bdev = lc->dev->bdev; struct file fake_file = {}; struct dentry fake_dentry = {}; + int r = 0; fake_file.f_mode = lc->dev->mode; fake_file.f_path.dentry = &fake_dentry; fake_dentry.d_inode = bdev->bd_inode; - return blkdev_driver_ioctl(bdev->bd_inode, &fake_file, bdev->bd_disk, cmd, arg); + /* + * Only pass ioctls through if the device sizes match exactly. + */ + if (lc->start || + ti->len != i_size_read(bdev->bd_inode) >> SECTOR_SHIFT) + r = scsi_verify_blk_ioctl(NULL, cmd); + + return r ? : blkdev_driver_ioctl(bdev->bd_inode, &fake_file, bdev->bd_disk, 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 7830b01ca58..088cf5c1d54 100644 --- a/drivers/md/dm-mpath.c +++ b/drivers/md/dm-mpath.c @@ -1421,6 +1421,12 @@ static int multipath_ioctl(struct dm_target *ti, struct inode *inode, 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->bd_inode, &fake_file, bdev->bd_disk, cmd, arg); } |