[PATCH storage 0/7] iscsi: per-node target and portal configuration

[Dietmar Maurer <dietmar@proxmox.com>]

Where every node reaches the same SAN through a different portal, and
sometimes through a different target, a single cluster-wide
portal/target pair is not enough. Patch 5 adds an 'iscsi-node-map'
property to the iSCSI storage: static target and portal entries, each
optionally restricted to a set of nodes. Entries without a node list
act as the default, so only the nodes that differ need one, and a node
can resolve to several targets, which allows multipath across
per-controller target names. Mapped entries skip sendtargets discovery
and sync the node db records directly, which also covers SANs that
filter discovery or do not implement it.

Patch 7 adds 'periodic-discovery'. Re-running discovery before every
login resets tuned node.* settings, so with periodic-discovery=0 it
only runs to seed an empty node db. The default keeps the current
behavior.

Patches 1 and 2 are independent bug fixes and stand on their own.
Patch 2 is Mira's idea, from patches 11 and 12 of [0].

There is no GUI for either property yet, both are API and CLI only.

[0] solves the same problem one level up, with a cluster-wide
mapping/storage.cfg, a plugin framework, a CRUD API and an ACL path,
and Thomas found that direction right at a high level. I still think
the inline property fits iSCSI better: a mapping cannot usefully be
shared, since every entry names a target, and it has to list every
node while this needs only the exceptions. 

[0] https://lore.proxmox.com/pve-devel/20260430173220.441001-1-m.limbeck@proxmox.com/

Dietmar Maurer (7):
  iscsi: discovery: do not stop early on a foreign target
  iscsi: scan: do not persist discovery results in the node database
  iscsi: validate target names with a dedicated format
  iscsi: clarify that the portal property is the discovery address
  iscsi: add iscsi-node-map property for per-node target and portals
  iscsi: iscsi_portals: return empty list instead of fallback portal
  iscsi: add periodic-discovery flag to skip re-discovery on login

 src/PVE/Storage.pm             |   2 +-
 src/PVE/Storage/ISCSIPlugin.pm | 369 +++++++++++++++++++++++++++++----
 2 files changed, 326 insertions(+), 45 deletions(-)

-- 
2.47.3