[dm-devel] dm-multipath: Accept failed paths for multipath maps

[Hannes Reinecke]

On 07/18/2014 02:23 AM, Mike Snitzer wrote:
> On Thu, Jul 17 2014 at  8:04pm -0400,
> Mike Snitzer <snitzer at redhat.com> wrote:
>
>> Revisiting this can of worms...
>>
>> As part of full due-diligence on the approach that SUSE and NetApp have
>> seemingly enjoyed "for years" I reviewed Hannes' v3 patch, fixed one
>> issue and did some cleanup.  I then converted over to using a slightly
>> different approach where-in the DM core becomes a more willing
>> co-conspirator in this hack by introducing the ability to have
>> place-holder devices (dm_dev without an opened bdev) referenced in a DM
>> table.  The work is here:
>> http://git.kernel.org/cgit/linux/kernel/git/snitzer/linux.git/log/?h=throwaway-dm-mpath-placeholder-devs
>
> Here is the rolled up patch (the individual commits in the above branch
> are rather noisy given the sequencing):
>
>   drivers/md/dm-mpath.c | 51 +++++++++++++++++++++++++++++++++----------------
>   drivers/md/dm-table.c | 53 ++++++++++++++++++++++++++++++++++++++-------------
>   drivers/md/dm.c       |  5 ++---
>   drivers/md/dm.h       | 12 ++++++++++++
>   4 files changed, 89 insertions(+), 32 deletions(-)
>
These patches look quite okay; I'll be cross-checking with my 
version and do some testing there.

Will be sending some update once the testing is done.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		      zSeries & Storage
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