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authorMike Snitzer <snitzer@redhat.com>2010-08-12 04:14:01 +0100
committerAlasdair G Kergon <agk@redhat.com>2010-08-12 04:14:01 +0100
commita5664dad7e1a278d2915c2bf79cf42250e12d7db (patch)
tree3bdbe17f12376c63ea05100c2597757e01dc95e2 /virt/kvm
parent708e929513502fb050c0a3c3ee267cab5b056ded (diff)
dm ioctl: make bio or request based device type immutable
Determine whether a mapped device is bio-based or request-based when loading its first (inactive) table and don't allow that to be changed later. This patch performs different device initialisation in each of the two cases. (We don't think it's necessary to add code to support changing between the two types.) Allowed md->type transitions: DM_TYPE_NONE to DM_TYPE_BIO_BASED DM_TYPE_NONE to DM_TYPE_REQUEST_BASED We now prevent table_load from replacing the inactive table with a conflicting type of table even after an explicit table_clear. Introduce 'type_lock' into the struct mapped_device to protect md->type and to prepare for the next patch that will change the queue initialization and allocate memory while md->type_lock is held. Signed-off-by: Mike Snitzer <snitzer@redhat.com> Acked-by: Kiyoshi Ueda <k-ueda@ct.jp.nec.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com> drivers/md/dm-ioctl.c | 15 +++++++++++++++ drivers/md/dm.c | 37 ++++++++++++++++++++++++++++++------- drivers/md/dm.h | 5 +++++ include/linux/dm-ioctl.h | 4 ++-- 4 files changed, 52 insertions(+), 9 deletions(-)
Diffstat (limited to 'virt/kvm')
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