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Message-ID: <1432622756.26863.11.camel@haakon3.risingtidesystems.com>
Date: Mon, 25 May 2015 23:45:56 -0700
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>
Subject: Re: [PATCH-v3 00/10] target: se_node_acl + se_lun RCU conversions
Please ignore this resend..
On Tue, 2015-05-26 at 06:40 +0000, Nicholas A. Bellinger wrote:
> 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(-)
>
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