From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
Hi all,
Here is -v4 series for converting LIO target se_node_acl + se_lun
mapping tables from fixed size arrays to dynamic RCU (read-copy-update)
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.
The series has been updated to follow Paul's recent comments for
RCU notiation using rcu_dereference_check() for cases where a
dereference occurs outside of rcu_read_lock(), with an external
lock or reference already held. The code is now sparse clean.
This includes the following changes since -v3:
- Convert se_dev_entry->se_lun usage in se_dev_entry updater path
to use rcu_dereference_check() w/ se_node_acl->lun_entry_mutex
- Convert se_dev_entry->se_lun_acl in ALUA for do_transition_tg_pt_work()
to use rcu_dereference_check() w/ se_lun->lun_deve_lock
- Convert se_dev_entry->se_lun in PR ALL_TG_PT=1 special case to
use rcu_dereference_check() w/ se_dev_entry->pr_kref.refcount
- Convert se_dev_entry->se_lun_acl in PR for lun_acl_*depend_item()
to use rcu_dereference_check() w/ se_dev_entry->pr_kref.refcount
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 | 3 +-
drivers/target/target_core_configfs.c | 6 +-
drivers/target/target_core_device.c | 480 +++++++++++----------------
drivers/target/target_core_fabric_configfs.c | 75 ++---
drivers/target/target_core_internal.h | 17 +-
drivers/target/target_core_pr.c | 231 +++++++------
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, 680 insertions(+), 884 deletions(-)
--
1.9.1
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