linux-kernel - [PATCH v3 0/3] Improve readbility of NVME "wwid" attribute

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Date:   Thu, 20 Jul 2017 18:33:59 +0200
From:   Martin Wilck <mwilck@...e.com>
To:     Christoph Hellwig <hch@....de>,
        Keith Busch <keith.busch@...el.com>,
        Sagi Grimberg <sagi@...mberg.me>
Cc:     Martin Wilck <mwilck@...e.de>,
        Johannes Thumshirn <jthumshirn@...e.de>,
        Hannes Reinecke <hare@...e.de>, linux-nvme@...ts.infradead.org,
        linux-kernel@...r.kernel.org, joe@...ches.com
Subject: [PATCH v3 0/3] Improve readbility of NVME "wwid" attribute

With the current implementation, the default "fallback" WWID generation
code (if no nguid, euid etc. are defined) for Linux NVME host and target
results in the following WWID format:

nvme.0000-3163653363666438366239656630386200-4c696e75780000000000000000000000000000000000000000000000000000000000000000000000-00000002

This is not only hard to read, it poses real problems e.g. for multipath
(dm WWIDs are limited to 128 characters).

With this patch series, the WWID on a Linux host connected to a Linux target
looks like this:

nvme.0000-65613435333665653738613464363961-4c696e7578-00000001

Changes wrt v1:
 * 1/3: new, moved helper to include/linux/string.h (Christoph Hellwig)
        (you suggested kernel.h, but I think this matches string.h better)      
 * Dropped the last patch from the v1 series that would have changed valid WWIDs for
   HW NVME controllers.

Changes wrt v2:
 * 3/3: Make sure no underflow occurs (Joe Perches)

Martin Wilck (3):
  string.h: add memcpy_and_pad()
  nvmet: identify controller: improve standard compliance
  nvme: wwid_show: strip trailing 0-bytes

 drivers/nvme/host/core.c        |  6 ++++--
 drivers/nvme/target/admin-cmd.c | 13 ++++++-------
 include/linux/string.h          | 30 ++++++++++++++++++++++++++++++
 3 files changed, 40 insertions(+), 9 deletions(-)

-- 
2.13.2