[PATCH v2 0/3] Improve readbility of NVME "wwid" attribute

From: Martin Wilck
Date: Thu Jul 20 2017 - 11:29:08 EST


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.

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(-)

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2.13.2