[PATCH 0/3] libnvme: add support for discovering multipath of a shared ns

[Nilay Shroff]

Hi,

Recently released Linux kernel v6.14 added support for easily discovering
multiple paths to a shared NVMe namespace. This multipath information is
exposed to userspace via a new sysfs group attribute named "multipath",
located under /sys/block/<ns-blkdev>/. More details on this functionality
can be found here [1].

This patch series leverages that new functionality to discover multiple paths
to a shared namespace and exposes that information in libnvme so that it can
later be used by nvme-cli.

There are three patches in this series:
The first patch adds support for discovering NVMe paths using the sysfs
"multipath" group attribute.
The second patch adds a new "queue_depth" attribute under the NVMe path object.
The third patch adds a new "numa_nodes" attribute under the NVMe path object.

[1]: https://lore.kernel.org/all/20250112124154.60690-1-nilay@linux.ibm.com/

Nilay Shroff (3):
  tree: add support for discovering nvme paths using sysfs multipath
    link
  tree: add queue-depth attribute for nvme path object
  tree: add attribute numa_nodes for NVMe path object

 src/libnvme.map    |   2 +
 src/nvme/filters.c |   6 ++
 src/nvme/filters.h |   9 +++
 src/nvme/private.h |  11 ++-
 src/nvme/tree.c    | 184 ++++++++++++++++++++++++++++++++-------------
 src/nvme/tree.h    |  25 ++++++
 6 files changed, 184 insertions(+), 53 deletions(-)

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2.49.0