On 07/18/2014 02:23 AM, Mike Snitzer wrote:
On Thu, Jul 17 2014 at 8:04pm -0400,
Mike Snitzer <snitzer@xxxxxxxxxx> 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
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Dr. Hannes Reinecke zSeries & Storage
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SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
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