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| author | Nicholas Bellinger <nab@linux-iscsi.org> | 2015-05-10 19:31:10 -0700 |
|---|---|---|
| committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2015-06-01 00:24:33 -0700 |
| commit | 6bb826121be244a5a3c8bd8b7d45c47df18810b7 (patch) | |
| tree | 7a75624e4801567a4133bc5b373ed67dd1db1cbb /include/target | |
| parent | 9fcb57f39c0cde70bcccdc1d998d3060297e911c (diff) | |
| download | linux-6bb826121be244a5a3c8bd8b7d45c47df18810b7.tar.bz2 | |
target: Convert se_portal_group->tpg_lun_list[] to RCU hlist
This patch converts the fixed size se_portal_group->tpg_lun_list[]
to use modern RCU with hlist_head in order to support an arbitary
number of se_lun ports per target endpoint.
It includes dropping core_tpg_alloc_lun() from core_dev_add_lun(),
and calling it directly from target_fabric_make_lun() to allocate
a new se_lun. And add a new target_fabric_port_release() configfs
item callback to invoke kfree_rcu() to release memory during
se_lun->lun_group shutdown.
Also now that se_node_acl->lun_entry_hlist is using RCU, convert
existing tpg_lun_lock to struct mutex so core_tpg_add_node_to_devs()
can perform RCU updater logic without releasing ->tpg_lun_mutex.
Also, drop core_tpg_clear_object_luns() and it's single consumer
in iscsi-target, which is duplicating TPG LUN shutdown logic and
is current code results in a NOP.
Finally, sbp-target and xen-scsiback fabric driver conversions are
included, which are required due to the non-standard way they use
->tpg_lun_hlist.
Reviewed-by: Hannes Reinecke <hare@suse.de>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Sagi Grimberg <sagig@mellanox.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Chris Boot <bootc@bootc.net>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'include/target')
| -rw-r--r-- | include/target/target_core_base.h | 6 | ||||
| -rw-r--r-- | include/target/target_core_fabric.h | 1 |
2 files changed, 4 insertions, 3 deletions
diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h index cf3c6addf05a..c15fa1a3b945 100644 --- a/include/target/target_core_base.h +++ b/include/target/target_core_base.h @@ -725,6 +725,8 @@ struct se_lun { struct se_port_stat_grps port_stat_grps; struct completion lun_ref_comp; struct percpu_ref lun_ref; + struct hlist_node link; + struct rcu_head rcu_head; }; struct se_dev_stat_grps { @@ -877,11 +879,11 @@ struct se_portal_group { spinlock_t acl_node_lock; /* Spinlock for adding/removing sessions */ spinlock_t session_lock; - spinlock_t tpg_lun_lock; + struct mutex tpg_lun_mutex; struct list_head se_tpg_node; /* linked list for initiator ACL list */ struct list_head acl_node_list; - struct se_lun **tpg_lun_list; + struct hlist_head tpg_lun_hlist; struct se_lun tpg_virt_lun0; /* List of TCM sessions associated wth this TPG */ struct list_head tpg_sess_list; diff --git a/include/target/target_core_fabric.h b/include/target/target_core_fabric.h index 55654c90350d..b1e00a7d66de 100644 --- a/include/target/target_core_fabric.h +++ b/include/target/target_core_fabric.h @@ -157,7 +157,6 @@ struct se_node_acl *core_tpg_get_initiator_node_acl(struct se_portal_group *tpg, unsigned char *); struct se_node_acl *core_tpg_check_initiator_node_acl(struct se_portal_group *, unsigned char *); -void core_tpg_clear_object_luns(struct se_portal_group *); int core_tpg_set_initiator_node_queue_depth(struct se_portal_group *, unsigned char *, u32, int); int core_tpg_set_initiator_node_tag(struct se_portal_group *, |