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[dm-devel] [PATCH v2 0/2] dm: restrict conflicting table loads and improve queue initialization



A mapped_device now has a specific immutable type (md->type) that is
set during the initial table_load (see: patch 1/2).

The DM device's request_queue will only have an elevator allocated and
exposed via sysfs if it is request-based (see: patch 2/2).

Please see the individual patch headers for more details.
(Kiyoshi, if you approve please reply with your "Acked-by" :)

This patchset is based on agk's DM "editing" tree:
http://www.kernel.org/pub/linux/kernel/people/agk/patches/2.6/editing/
(apply all patches listed in the series file up to NEXT_PATCHES_END)

This also patchset depends on the following linux-2.6-block.git
'for-linus' branch commits:
01effb0 block: allow initialization of previously allocated request_queue
e36f724 block: Adjust elv_iosched_show to return "none" for bio-based DM

I've made a full quilt series available here (builds on 2.6.34):
http://people.redhat.com/msnitzer/patches/dm-queue-init/latest/

A monolithic patch is also available here:
http://people.redhat.com/msnitzer/patches/dm-queue-init/latest/monolithic.patch

I welcome all comments/review.

v2 changes:
- removed do_resume and table_clear interlock
- rebased to agk's latest "editing" tree
- dropped the dm_get_verified_mdptr and find_device_noinit patches that
  were at the end of v1; can revisit that code duplication cleanup later

Mike Snitzer (2):
  dm: prevent table type changes after initial table load
  dm: only initialize full request_queue for request-based device

 drivers/md/dm-ioctl.c |   40 ++++++++++
 drivers/md/dm.c       |  189 ++++++++++++++++++++++++++++++++++++++++--------
 drivers/md/dm.h       |    8 ++
 3 files changed, 205 insertions(+), 32 deletions(-)


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