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author | Nicholas Bellinger <nab@linux-iscsi.org> | 2015-05-10 19:31:10 -0700 |
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committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2015-06-01 00:24:33 -0700 |
commit | 6bb826121be244a5a3c8bd8b7d45c47df18810b7 (patch) | |
tree | 7a75624e4801567a4133bc5b373ed67dd1db1cbb /drivers/target/target_core_device.c | |
parent | 9fcb57f39c0cde70bcccdc1d998d3060297e911c (diff) | |
download | blackbird-obmc-linux-6bb826121be244a5a3c8bd8b7d45c47df18810b7.tar.gz blackbird-obmc-linux-6bb826121be244a5a3c8bd8b7d45c47df18810b7.zip |
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 'drivers/target/target_core_device.c')
-rw-r--r-- | drivers/target/target_core_device.c | 92 |
1 files changed, 7 insertions, 85 deletions
diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c index 97792cc81fe4..431e5fc8daec 100644 --- a/drivers/target/target_core_device.c +++ b/drivers/target/target_core_device.c @@ -1172,22 +1172,17 @@ int se_dev_set_block_size(struct se_device *dev, u32 block_size) } EXPORT_SYMBOL(se_dev_set_block_size); -struct se_lun *core_dev_add_lun( +int core_dev_add_lun( struct se_portal_group *tpg, struct se_device *dev, - u32 unpacked_lun) + struct se_lun *lun) { - struct se_lun *lun; int rc; - lun = core_tpg_alloc_lun(tpg, unpacked_lun); - if (IS_ERR(lun)) - return lun; - rc = core_tpg_add_lun(tpg, lun, TRANSPORT_LUNFLAGS_READ_WRITE, dev); if (rc < 0) - return ERR_PTR(rc); + return rc; pr_debug("%s_TPG[%u]_LUN[%u] - Activated %s Logical Unit from" " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(), @@ -1212,7 +1207,7 @@ struct se_lun *core_dev_add_lun( spin_unlock_irq(&tpg->acl_node_lock); } - return lun; + return 0; } /* core_dev_del_lun(): @@ -1231,68 +1226,6 @@ void core_dev_del_lun( core_tpg_remove_lun(tpg, lun); } -struct se_lun *core_get_lun_from_tpg(struct se_portal_group *tpg, u32 unpacked_lun) -{ - struct se_lun *lun; - - spin_lock(&tpg->tpg_lun_lock); - if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) { - pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS" - "_PER_TPG-1: %u for Target Portal Group: %hu\n", - tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun, - TRANSPORT_MAX_LUNS_PER_TPG-1, - tpg->se_tpg_tfo->tpg_get_tag(tpg)); - spin_unlock(&tpg->tpg_lun_lock); - return NULL; - } - lun = tpg->tpg_lun_list[unpacked_lun]; - - if (lun->lun_status != TRANSPORT_LUN_STATUS_FREE) { - pr_err("%s Logical Unit Number: %u is not free on" - " Target Portal Group: %hu, ignoring request.\n", - tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun, - tpg->se_tpg_tfo->tpg_get_tag(tpg)); - spin_unlock(&tpg->tpg_lun_lock); - return NULL; - } - spin_unlock(&tpg->tpg_lun_lock); - - return lun; -} - -/* core_dev_get_lun(): - * - * - */ -static struct se_lun *core_dev_get_lun(struct se_portal_group *tpg, u32 unpacked_lun) -{ - struct se_lun *lun; - - spin_lock(&tpg->tpg_lun_lock); - if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) { - pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER" - "_TPG-1: %u for Target Portal Group: %hu\n", - tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun, - TRANSPORT_MAX_LUNS_PER_TPG-1, - tpg->se_tpg_tfo->tpg_get_tag(tpg)); - spin_unlock(&tpg->tpg_lun_lock); - return NULL; - } - lun = tpg->tpg_lun_list[unpacked_lun]; - - if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) { - pr_err("%s Logical Unit Number: %u is not active on" - " Target Portal Group: %hu, ignoring request.\n", - tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun, - tpg->se_tpg_tfo->tpg_get_tag(tpg)); - spin_unlock(&tpg->tpg_lun_lock); - return NULL; - } - spin_unlock(&tpg->tpg_lun_lock); - - return lun; -} - struct se_lun_acl *core_dev_init_initiator_node_lun_acl( struct se_portal_group *tpg, struct se_node_acl *nacl, @@ -1326,22 +1259,11 @@ struct se_lun_acl *core_dev_init_initiator_node_lun_acl( int core_dev_add_initiator_node_lun_acl( struct se_portal_group *tpg, struct se_lun_acl *lacl, - u32 unpacked_lun, + struct se_lun *lun, u32 lun_access) { - struct se_lun *lun; - struct se_node_acl *nacl; + struct se_node_acl *nacl = lacl->se_lun_nacl; - lun = core_dev_get_lun(tpg, unpacked_lun); - if (!lun) { - pr_err("%s Logical Unit Number: %u is not active on" - " Target Portal Group: %hu, ignoring request.\n", - tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun, - tpg->se_tpg_tfo->tpg_get_tag(tpg)); - return -EINVAL; - } - - nacl = lacl->se_lun_nacl; if (!nacl) return -EINVAL; @@ -1362,7 +1284,7 @@ int core_dev_add_initiator_node_lun_acl( pr_debug("%s_TPG[%hu]_LUN[%u->%u] - Added %s ACL for " " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(), - tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun, lacl->mapped_lun, + tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, lacl->mapped_lun, (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO", lacl->initiatorname); /* |