Linux Device Mapper development
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From: Martin Wilck <mwilck@suse.com>
To: Benjamin Marzinski <bmarzins@redhat.com>
Cc: dm-devel@redhat.com, Julian Andres Klode <julian.klode@canonical.com>
Subject: Re: [PATCH v4 10/20] libmultipath: indicate wwid failure in dm_addmap_create()
Date: Fri, 13 Apr 2018 00:43:44 +0200	[thread overview]
Message-ID: <1523573024.4346.122.camel@suse.com> (raw)
In-Reply-To: <20180412213211.GA3103@octiron.msp.redhat.com>

On Thu, 2018-04-12 at 16:32 -0500, Benjamin Marzinski wrote:
> On Thu, Apr 12, 2018 at 10:22:19PM +0200, Martin Wilck wrote:
> > 
> > But I suppose I'm still missing your point.
> 
> Any failure in ev_add_path() before the call to domap() could cause
> multipath device creation to fail, without triggering this. For
> instance
> add_map_with_path() or setup_map() can fail for a host of reasons.

OK, got it, finally. The semantics of my failed marker were intended to
be exactly what they are now: we tried DM_DEVICE_CREATE for this WWID,
and failed. Other semantics are certainly possible, but much harder to
define cleanly.

I believe that catches a large portion of the real-world failures. And
in many cases, this failure means that one or more devices are busy.
(Oh, it could also mean that we tried to set 'hwhandler "1 alua"' for a
device that doesn't support ALUA, but I digress ;-)

Martin

-- 
Dr. Martin Wilck <mwilck@suse.com>, Tel. +49 (0)911 74053 2107
SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton
HRB 21284 (AG Nürnberg)

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  reply	other threads:[~2018-04-12 22:43 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-04 16:16 [PATCH v4 00/20] multipath path classification Martin Wilck
2018-04-04 16:16 ` [PATCH v4 01/20] Revert "multipath: ignore -i if find_multipaths is set" Martin Wilck
2018-04-04 16:16 ` [PATCH v4 02/20] Revert "multipathd: imply -n " Martin Wilck
2018-04-04 16:16 ` [PATCH v4 03/20] libmultipath: should_multipath: keep existing maps Martin Wilck
2018-04-04 16:16 ` [PATCH v4 04/20] multipath -u -i: respect entries in WWIDs file Martin Wilck
2018-04-04 16:16 ` [PATCH v4 05/20] libmultipath: trigger change uevent on new device creation Martin Wilck
2018-04-04 16:16 ` [PATCH v4 06/20] libmultipath: trigger path uevent only when necessary Martin Wilck
2018-04-04 16:16 ` [PATCH v4 07/20] libmultipath: change find_multipaths option to multi-value Martin Wilck
2018-04-12 18:32   ` Benjamin Marzinski
2018-04-13 18:23   ` Martin Wilck
2018-04-04 16:16 ` [PATCH v4 08/20] libmultipath: use const char* in open_file() Martin Wilck
2018-04-04 16:16 ` [PATCH v4 09/20] libmultipath: functions to indicate mapping failure in /dev/shm Martin Wilck
2018-04-12 18:33   ` Benjamin Marzinski
2018-04-12 20:07     ` Martin Wilck
2018-04-12 21:27       ` Benjamin Marzinski
2018-04-04 16:16 ` [PATCH v4 10/20] libmultipath: indicate wwid failure in dm_addmap_create() Martin Wilck
2018-04-12 18:33   ` Benjamin Marzinski
2018-04-12 20:16     ` Martin Wilck
2018-04-12 20:22       ` Martin Wilck
2018-04-12 21:32         ` Benjamin Marzinski
2018-04-12 22:43           ` Martin Wilck [this message]
2018-04-04 16:16 ` [PATCH v4 11/20] multipath -u: common code path for result message Martin Wilck
2018-04-12 18:34   ` Benjamin Marzinski
2018-04-04 16:16 ` [PATCH v4 12/20] multipath -u: change output to environment/key format Martin Wilck
2018-04-12 18:35   ` Benjamin Marzinski
2018-04-04 16:16 ` [PATCH v4 13/20] multipath -u: treat failed wwids as invalid Martin Wilck
2018-04-12 18:35   ` Benjamin Marzinski
2018-04-04 16:16 ` [PATCH v4 14/20] multipath -u: add DM_MULTIPATH_DEVICE_PATH=2 for "maybe" Martin Wilck
2018-04-04 16:16 ` [PATCH v4 15/20] libmultipath: implement find_multipaths_timeout Martin Wilck
2018-04-12 18:35   ` Benjamin Marzinski
2018-04-04 16:16 ` [PATCH v4 16/20] multipath -u : set FIND_MULTIPATHS_WAIT_UNTIL from /dev/shm Martin Wilck
2018-04-12 18:36   ` Benjamin Marzinski
2018-04-12 20:35     ` Martin Wilck
2018-04-12 21:35       ` Benjamin Marzinski
2018-04-04 16:16 ` [PATCH v4 18/20] multipath -u: quick check if path is multipathed Martin Wilck
2018-04-12 18:46   ` Benjamin Marzinski
2018-04-12 22:19     ` Martin Wilck
2018-04-13 16:12       ` Benjamin Marzinski
2018-04-13 17:59         ` Martin Wilck
2018-04-04 16:16 ` [PATCH v4 19/20] libmultipath: enable find_multipaths "smart" Martin Wilck
2018-04-12 18:47   ` Benjamin Marzinski
2018-04-12 22:27     ` Martin Wilck
2018-04-13 15:59       ` Benjamin Marzinski
2018-04-04 16:16 ` [PATCH v4 20/20] multipath.rules: find_multipaths "smart" logic Martin Wilck
2018-04-12 18:48   ` Benjamin Marzinski
2018-04-13 16:01     ` Benjamin Marzinski

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