• Nicholas Bellinger's avatar
    target: Convert se_portal_group->tpg_lun_list[] to RCU hlist · 6bb82612
    Nicholas Bellinger authored
    This patch converts the fixed size se_portal_group->tpg_lun_list[]
    to use modern RCU with hlist_head in order to support an arbitary
    number of se_lun ports per target endpoint.
    It includes dropping core_tpg_alloc_lun() from core_dev_add_lun(),
    and calling it directly from target_fabric_make_lun() to allocate
    a new se_lun.  And add a new target_fabric_port_release() configfs
    item callback to invoke kfree_rcu() to release memory during
    se_lun->lun_group shutdown.
    Also now that se_node_acl->lun_entry_hlist is using RCU, convert
    existing tpg_lun_lock to struct mutex so core_tpg_add_node_to_devs()
    can perform RCU updater logic without releasing ->tpg_lun_mutex.
    Also, drop core_tpg_clear_object_luns() and it's single consumer
    in iscsi-target, which is duplicating TPG LUN shutdown logic and
    is current code results in a NOP.
    Finally, sbp-target and xen-scsiback fabric driver conversions are
    included, which are required due to the non-standard way they use
    Reviewed-by: default avatarHannes Reinecke <hare@suse.de>
    Cc: Christoph Hellwig <hch@lst.de>
    Cc: Sagi Grimberg <sagig@mellanox.com>
    Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
    Cc: Chris Boot <bootc@bootc.net>
    Signed-off-by: default avatarNicholas Bellinger <nab@linux-iscsi.org>
target_core_base.h 26.5 KB