[dm-devel] [PATCH v2 0/2] dm: alternate solution to reloading with failed paths

[Mike Snitzer]

Hi Hannes,

Here is v2 of Ben's approach to fixing the inability to reload a
multipath table that includes failed paths.  I've staged it in
linux-dm.git's 'for-next' branch.

But I wanted to send this v2 out to verify this approach works for
you.  This approach is focused on allowing failed paths to be pushed
down in a multipath table.

It does _not_ allow non-existent devices to be listed in an mpath
table like your patchset did.  So the aggressive dev_loss_tmo case
isn't covered... but Ben said that case is already handled by
multipathd getting a change event and pushing the table down without
the removed SCSI device(s).

Thoughts?
Mike

Benjamin Marzinski (2):
  dm mpath: stop queueing IO when no valid paths exist
  dm: allow active and inactive tables to share dm_devs

 drivers/md/dm-ioctl.c         |   2 +-
 drivers/md/dm-mpath.c         |   4 +-
 drivers/md/dm-table.c         | 102 ++++++++++++----------------------
 drivers/md/dm.c               | 126 ++++++++++++++++++++++++++++++++++++++++++
 drivers/md/dm.h               |   5 +-
 include/uapi/linux/dm-ioctl.h |   4 +-
 6 files changed, 170 insertions(+), 73 deletions(-)

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1.9.3