[PATCH-v3 00/10] target: se_node_acl + se_lun RCU conversions

From: Nicholas A. Bellinger
Date: Tue May 26 2015 - 02:52:23 EST


From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>

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@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/