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Date: Tue, 26 May 2015 06:40:20 +0000 From: "Nicholas A. Bellinger" <nab@...ux-iscsi.org> To: target-devel <target-devel@...r.kernel.org> Cc: linux-scsi <linux-scsi@...r.kernel.org>, linux-kernel <linux-kernel@...r.kernel.org>, Christoph Hellwig <hch@....de>, Hannes Reinecke <hare@...e.de>, Sagi Grimberg <sagig@...lanox.com>, "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, Nicholas Bellinger <nab@...ux-iscsi.org> Subject: [PATCH-v3 00/10] target: se_node_acl + se_lun RCU conversions From: Nicholas Bellinger <nab@...ux-iscsi.org> Hi all, Here is -v3 series for converting LIO target se_node_acl + se_lun mapping tables from fixed size arrays to dynamic RCU hlist_heads. This turns fast-path I/O into a lock-less RCU reader using existing percpu based se_lun->lun_ref logic, and converts the RCU updater path to allow for an arbitrary number of LUNs for both types of mappings within target-core. As per this afternoon's email thread, the se_dev_entry->pr_comp has been left in place for se_dev_entry shutdown within patch #1. This completion is still required in order to prevent the configfs se_lun_acl->se_lun_group from being removed from out below the core_scsi3_lunacl_depend_item() caller during the special-case PR ALL_TG_PT=1 registration handling. The changes based on -v2 series feedback from HCH & Co include: - Remove unused se_dev_entry->se_node_acl - Drop unnecessary check in lunacl_undepend_item - target: Drop bogus mutex_unlock in core_disable_device_list_for_node - Drop left-over se_lun->lun_status - target: Rename ->pr_regs to ->deve_flags + add bit definitions - target: Convert se_dev_entry stats to atomic_long_t - Avoid unnecessary PR target_nacl_find_deve() lookup in registration - Add se_lun->lun_index for RCU dev->dev_index usage in stat.c - Add various rcu_dereference and lockless_dereference RCU notation Please review. --nab Christoph Hellwig (1): target/pr: cleanup core_scsi3_pr_seq_non_holder Nicholas Bellinger (9): target: Convert se_node_acl->device_list[] to RCU hlist target/pr: Use atomic bitop for se_dev_entry->deve_flags reservation check 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 target: Only reset specific dynamic entries during lun_group creation target: Drop left-over se_lun->lun_status drivers/target/iscsi/iscsi_target_tpg.c | 2 - drivers/target/sbp/sbp_target.c | 97 +++--- drivers/target/sbp/sbp_target.h | 2 +- drivers/target/target_core_alua.c | 2 +- drivers/target/target_core_configfs.c | 6 +- drivers/target/target_core_device.c | 477 +++++++++++---------------- drivers/target/target_core_fabric_configfs.c | 75 ++--- drivers/target/target_core_internal.h | 17 +- drivers/target/target_core_pr.c | 221 +++++++------ drivers/target/target_core_pscsi.c | 7 +- drivers/target/target_core_spc.c | 18 +- drivers/target/target_core_stat.c | 197 +++++------ drivers/target/target_core_tpg.c | 271 ++++----------- 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_backend.h | 2 +- include/target/target_core_base.h | 53 ++- include/target/target_core_fabric.h | 1 - 20 files changed, 665 insertions(+), 885 deletions(-) -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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