From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753919Ab2ALPC0 (ORCPT ); Thu, 12 Jan 2012 10:02:26 -0500 Received: from mail-yx0-f174.google.com ([209.85.213.174]:60736 "EHLO mail-yx0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753957Ab2ALPCI (ORCPT ); Thu, 12 Jan 2012 10:02:08 -0500 From: Paolo Bonzini To: linux-kernel@vger.kernel.org Cc: Petr Matousek , Linus Torvalds , Alasdair G Kergon , dm-devel@redhat.com Subject: [PATCH v2 3/3] dm: do not forward ioctls from logical volumes to the underlying device Date: Thu, 12 Jan 2012 16:01:29 +0100 Message-Id: <1326380489-9044-4-git-send-email-pbonzini@redhat.com> X-Mailer: git-send-email 1.7.7.1 In-Reply-To: <1326380489-9044-1-git-send-email-pbonzini@redhat.com> References: <1326380489-9044-1-git-send-email-pbonzini@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- drivers/md/dm-flakey.c | 11 ++++++++++- drivers/md/dm-linear.c | 12 +++++++++++- drivers/md/dm-mpath.c | 6 ++++++ 3 files changed, 27 insertions(+), 2 deletions(-) diff --git a/drivers/md/dm-flakey.c b/drivers/md/dm-flakey.c index f84c080..9fb18c1 100644 --- a/drivers/md/dm-flakey.c +++ b/drivers/md/dm-flakey.c @@ -368,8 +368,17 @@ static int flakey_status(struct dm_target *ti, status_type_t type, static int flakey_ioctl(struct dm_target *ti, unsigned int cmd, unsigned long arg) { struct flakey_c *fc = ti->private; + struct dm_dev *dev = fc->dev; + int r = 0; - return __blkdev_driver_ioctl(fc->dev->bdev, fc->dev->mode, cmd, arg); + /* + * Only pass ioctls through if the device sizes match exactly. + */ + if (fc->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 flakey_merge(struct dm_target *ti, struct bvec_merge_data *bvm, diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c index 3921e3b..9728839 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, 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); } -- 1.7.7.1