This patch added a function tcmu_gen_it_nexus() which can help generate a string contain IT_Nexus information from a session.
Signed-off-by: Zhu Lingshan <[email protected]> --- drivers/target/target_core_user.c | 44 +++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+) diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c index d368c656ef79..26d8aee40719 100644 --- a/drivers/target/target_core_user.c +++ b/drivers/target/target_core_user.c @@ -1769,6 +1769,50 @@ static int tcmu_set_dev_pr_info(struct tcmu_dev *udev, void *val) return tcmu_send_set_pr_info_event(udev, val); } +static int +tcmu_gen_it_nexus(struct se_session *se_sess, + char *nexus_buf, + size_t buflen) +{ + struct se_portal_group *se_tpg; + const struct target_core_fabric_ops *tfo; + u32 tpg_tag = 0; + char *tpg_wwn = ""; + int rc; + + if (!se_sess || !se_sess->se_node_acl || !se_sess->se_tpg + || !se_sess->se_tpg->se_tpg_tfo) { + pr_warn("invalid session for IT nexus generation\n"); + return -EINVAL; + } + + se_tpg = se_sess->se_tpg; + tfo = se_tpg->se_tpg_tfo; + + /* + * nexus generation may be coming from an xcopy, in which case tfo + * refers to xcopy_pt_tfo (tpg_get_wwn and tpg_get_tag are NULL). + */ + if (tfo->tpg_get_tag) + tpg_tag = tfo->tpg_get_tag(se_tpg); + if (tfo->tpg_get_wwn) + tpg_wwn = tfo->tpg_get_wwn(se_tpg); + + rc = snprintf(nexus_buf, buflen, "%s,i,0x%llx,%s,t,0x%x", + se_sess->se_node_acl->initiatorname, + se_sess->sess_bin_isid, + tpg_wwn, + tpg_tag); + if ((rc < 0) || (rc >= buflen)) { + pr_debug("error formatting reserve cookie\n"); + return -EINVAL; + } + + pr_debug("generated nexus: %s\n", nexus_buf); + + return 0; +} + static int tcmu_configure_device(struct se_device *dev) { struct tcmu_dev *udev = TCMU_DEV(dev); -- 2.17.1
