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tcm_qla2xxx: Perform configfs depend/undepend for base_tpg 

This patch performs configfs_depend_item() during TPG enable for
base_tpg (eg: non-NPIV) ports, and configfs_undepend_item() during
TPG disable for base_tpg.

This is done to ensure that any attempt to configfs rmdir a base_tpg
with active NPIV ports will fail with -EBUSY, until all associated
NPIV ports have been explicitly shutdown and base_tpg disabled.

Note that the actual configfs_[un]depend_item() is done from seperate
process context, as these are not intended to be called directly
from configfs callbacks.

Cc: Sawan Chandak <sawan.chandak@qlogic.com>
Cc: Quinn Tran <quinn.tran@qlogic.com>
Cc: Saurav Kashyap <saurav.kashyap@qlogic.com>
Cc: Giridhar Malavali <giridhar.malavali@qlogic.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Nicholas Bellinger 2014-02-19 16:53:07 -08:00
parent 394d62ba45
commit 7474f52a82
2 changed files with 61 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

72
drivers/scsi/qla2xxx/tcm_qla2xxx.c
View File

@ -941,15 +941,41 @@ static ssize_t tcm_qla2xxx_tpg_show_enable(
atomic_read(&tpg->lport_tpg_enabled));
}
static void tcm_qla2xxx_depend_tpg(struct work_struct *work)
{
struct tcm_qla2xxx_tpg *base_tpg = container_of(work,
struct tcm_qla2xxx_tpg, tpg_base_work);
struct se_portal_group *se_tpg = &base_tpg->se_tpg;
struct scsi_qla_host *base_vha = base_tpg->lport->qla_vha;
if (!configfs_depend_item(se_tpg->se_tpg_tfo->tf_subsys,
&se_tpg->tpg_group.cg_item)) {
atomic_set(&base_tpg->lport_tpg_enabled, 1);
qlt_enable_vha(base_vha);
}
complete(&base_tpg->tpg_base_comp);
}
static void tcm_qla2xxx_undepend_tpg(struct work_struct *work)
{
struct tcm_qla2xxx_tpg *base_tpg = container_of(work,
struct tcm_qla2xxx_tpg, tpg_base_work);
struct se_portal_group *se_tpg = &base_tpg->se_tpg;
struct scsi_qla_host *base_vha = base_tpg->lport->qla_vha;
if (!qlt_stop_phase1(base_vha->vha_tgt.qla_tgt)) {
atomic_set(&base_tpg->lport_tpg_enabled, 0);
configfs_undepend_item(se_tpg->se_tpg_tfo->tf_subsys,
&se_tpg->tpg_group.cg_item);
}
complete(&base_tpg->tpg_base_comp);
}
static ssize_t tcm_qla2xxx_tpg_store_enable(
struct se_portal_group *se_tpg,
const char *page,
size_t count)
{
struct se_wwn *se_wwn = se_tpg->se_tpg_wwn;
struct tcm_qla2xxx_lport *lport = container_of(se_wwn,
struct tcm_qla2xxx_lport, lport_wwn);
struct scsi_qla_host *vha = lport->qla_vha;
struct tcm_qla2xxx_tpg *tpg = container_of(se_tpg,
struct tcm_qla2xxx_tpg, se_tpg);
unsigned long op;
@ -964,19 +990,28 @@ static ssize_t tcm_qla2xxx_tpg_store_enable(
pr_err("Illegal value for tpg_enable: %lu\n", op);
return -EINVAL;
}
if (op) {
if (atomic_read(&tpg->lport_tpg_enabled))
return -EEXIST;
INIT_WORK(&tpg->tpg_base_work, tcm_qla2xxx_depend_tpg);
} else {
if (!atomic_read(&tpg->lport_tpg_enabled))
return count;
INIT_WORK(&tpg->tpg_base_work, tcm_qla2xxx_undepend_tpg);
}
init_completion(&tpg->tpg_base_comp);
schedule_work(&tpg->tpg_base_work);
wait_for_completion(&tpg->tpg_base_comp);
if (op) {
atomic_set(&tpg->lport_tpg_enabled, 1);
qlt_enable_vha(vha);
} else {
if (!vha->vha_tgt.qla_tgt) {
pr_err("struct qla_hw_data *vha->vha_tgt.qla_tgt is NULL\n");
if (!atomic_read(&tpg->lport_tpg_enabled))
return -ENODEV;
}
atomic_set(&tpg->lport_tpg_enabled, 0);
qlt_stop_phase1(vha->vha_tgt.qla_tgt);
} else {
if (atomic_read(&tpg->lport_tpg_enabled))
return -EPERM;
}
return count;
}
@ -1703,6 +1738,9 @@ static int tcm_qla2xxx_lport_register_npiv_cb(struct scsi_qla_host *base_vha,
struct scsi_qla_host *npiv_vha;
struct tcm_qla2xxx_lport *lport =
(struct tcm_qla2xxx_lport *)target_lport_ptr;
struct tcm_qla2xxx_lport *base_lport =
(struct tcm_qla2xxx_lport *)base_vha->vha_tgt.target_lport_ptr;
struct tcm_qla2xxx_tpg *base_tpg;
struct fc_vport_identifiers vport_id;
if (!qla_tgt_mode_enabled(base_vha)) {
@ -1710,6 +1748,13 @@ static int tcm_qla2xxx_lport_register_npiv_cb(struct scsi_qla_host *base_vha,
return -EPERM;
}
if (!base_lport || !base_lport->tpg_1 ||
!atomic_read(&base_lport->tpg_1->lport_tpg_enabled)) {
pr_err("qla2xxx base_lport or tpg_1 not available\n");
return -EPERM;
}
base_tpg = base_lport->tpg_1;
memset(&vport_id, 0, sizeof(vport_id));
vport_id.port_name = npiv_wwpn;
vport_id.node_name = npiv_wwnn;
@ -1728,7 +1773,6 @@ static int tcm_qla2xxx_lport_register_npiv_cb(struct scsi_qla_host *base_vha,
npiv_vha = (struct scsi_qla_host *)vport->dd_data;
npiv_vha->vha_tgt.target_lport_ptr = target_lport_ptr;
lport->qla_vha = npiv_vha;
scsi_host_get(npiv_vha->host);
return 0;
}

3
drivers/scsi/qla2xxx/tcm_qla2xxx.h
View File

@ -43,6 +43,9 @@ struct tcm_qla2xxx_tpg {
struct tcm_qla2xxx_tpg_attrib tpg_attrib;
/* Returned by tcm_qla2xxx_make_tpg() */
struct se_portal_group se_tpg;
/* Items for dealing with configfs_depend_item */
struct completion tpg_base_comp;
struct work_struct tpg_base_work;
};
struct tcm_qla2xxx_fc_loopid {