From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx> Hi all, This patch converts target-core from traditional fixed size arrays for TPG LUN and NodeACL MappedLUNs tables to modern read-copy-update (RCU) logic using hlist_head primitives. This includes the changes necessary for performing se_dev_entry + se_lun allocation + call_rcu() release within RCU updater path code, fast-path conversion of transport_lookup_*_lun() to lock-less RCU reader using existing percpu_ref, and a handful of fabric configfs and CDB emulation related RCU reader changes. It allows for an arbitrary number of entries per hlist_head, but for the moment is still enforcing TRANSPORT_MAX_LUNS_PER_TPG following what user-space expects. It also converts non-fast path RCU updater code to use blocking struct mutex instead of spinlocks for both hlist_heads. Note that sbp-target is broken atm due to the way it's using se_lun directly, and will be fixed up soon. Please review. --nab Nicholas Bellinger (12): target: Convert se_node_acl->device_list[] to RCU hlist target: Convert REPORT_LUN + MODE_SENSE to RCU reader target/configfs: Convert mappedlun + SCSI MIBs to RCU reader target: Convert UNIT_ATTENTION logic to RCU reader target: Convert transport_lookup_*_lun to RCU reader target/pr: Convert se_dev_entry to kref for RCU target/pr: Convert registration check to RCU pointer target/pr: Change alloc_registration to avoid pr_reg_tg_pt_lun target: Convert se_portal_group->tpg_lun_list[] to RCU hlist target: Convert se_tpg->acl_node_lock to ->acl_node_mutex target: Convert core_tpg_deregister to use list splice target: Drop unused se_lun->lun_acl_list drivers/target/iscsi/iscsi_target_tpg.c | 2 - drivers/target/sbp/sbp_target.c | 16 +- drivers/target/target_core_configfs.c | 6 +- drivers/target/target_core_device.c | 409 ++++++++++++--------------- drivers/target/target_core_fabric_configfs.c | 65 +++-- drivers/target/target_core_internal.h | 9 +- drivers/target/target_core_pr.c | 210 ++++++++------ drivers/target/target_core_pscsi.c | 17 +- drivers/target/target_core_spc.c | 27 +- drivers/target/target_core_stat.c | 180 ++++++------ drivers/target/target_core_tpg.c | 249 +++++----------- drivers/target/target_core_transport.c | 20 +- drivers/target/target_core_ua.c | 51 ++-- drivers/target/tcm_fc/tfc_conf.c | 4 +- drivers/xen/xen-scsiback.c | 27 +- include/target/target_core_base.h | 31 +- include/target/target_core_fabric.h | 1 - 17 files changed, 633 insertions(+), 691 deletions(-) -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
