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target: Make standard INQUIRY return 'not connected' for tpg_virt_lun0 

This patch changes target_emulate_inquiry_std() to set the 'not connected'
(0x35) bit in standard INQUIRY response data when we are processing a
request to a virtual LUN=0 mapping from struct se_device *g_lun0_dev that
have been setup for us in transport_lookup_cmd_lun().

This addresses an issue where qla2xxx FC clients need to be able
to create demo-mode I_T FC Nexuses by default, but should not be
exposing the default set of TPG LUNs to all FC clients.  This includes
adding an new optional target_core_fabric_ops->tpg_check_demo_mode_login_only()
caller to allow demo_mode nexuses to skip the old default of bulding
a demo-mode MappedLUNs list via core_tpg_add_node_to_devs().

(roland: Add missing tpg_check_demo_mode_login_only check in core_dev_add_lun)

Reported-by: Roland Dreier <roland@purestorage.com>
Cc: Andrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: Nicholas Bellinger <nab@risingtidesystems.com>
This commit is contained in:
Nicholas Bellinger 2011-07-26 17:48:43 -07:00
parent eb39d34004
commit 052605c6ca
4 changed files with 27 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
drivers/target/target_core_cdb.c
View File

@ -67,6 +67,7 @@ target_emulate_inquiry_std(struct se_cmd *cmd)
{
struct se_lun *lun = cmd->se_lun;
struct se_device *dev = cmd->se_dev;
struct se_portal_group *tpg = lun->lun_sep->sep_tpg;
unsigned char *buf;
/*
@ -81,9 +82,13 @@ target_emulate_inquiry_std(struct se_cmd *cmd)
buf = transport_kmap_first_data_page(cmd);
buf[0] = dev->transport->get_device_type(dev);
if (buf[0] == TYPE_TAPE)
buf[1] = 0x80;
if (dev == tpg->tpg_virt_lun0.lun_se_dev) {
buf[0] = 0x3f; /* Not connected */
} else {
buf[0] = dev->transport->get_device_type(dev);
if (buf[0] == TYPE_TAPE)
buf[1] = 0x80;
}
buf[2] = dev->transport->get_device_rev(dev);
/*

4
drivers/target/target_core_device.c
View File

@ -1346,7 +1346,9 @@ struct se_lun *core_dev_add_lun(
struct se_node_acl *acl;
spin_lock_bh(&tpg->acl_node_lock);
list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
if (acl->dynamic_node_acl) {
if (acl->dynamic_node_acl &&
(!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
spin_unlock_bh(&tpg->acl_node_lock);
core_tpg_add_node_to_devs(acl, tpg);
spin_lock_bh(&tpg->acl_node_lock);

12
drivers/target/target_core_tpg.c
View File

@ -298,8 +298,16 @@ struct se_node_acl *core_tpg_check_initiator_node_acl(
tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
return NULL;
}
core_tpg_add_node_to_devs(acl, tpg);
/*
* Here we only create demo-mode MappedLUNs from the active
* TPG LUNs if the fabric is not explictly asking for
* tpg_check_demo_mode_login_only() == 1.
*/
if ((tpg->se_tpg_tfo->tpg_check_demo_mode_login_only != NULL) &&
(tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg) == 1))
do { ; } while (0);
else
core_tpg_add_node_to_devs(acl, tpg);
spin_lock_bh(&tpg->acl_node_lock);
list_add_tail(&acl->acl_list, &tpg->acl_node_list);

6
include/target/target_core_fabric_ops.h
View File

@ -27,6 +27,12 @@ struct target_core_fabric_ops {
int (*tpg_check_demo_mode_cache)(struct se_portal_group *);
int (*tpg_check_demo_mode_write_protect)(struct se_portal_group *);
int (*tpg_check_prod_mode_write_protect)(struct se_portal_group *);
/*
* Optionally used by fabrics to allow demo-mode login, but not
* expose any TPG LUNs, and return 'not connected' in standard
* inquiry response
*/
int (*tpg_check_demo_mode_login_only)(struct se_portal_group *);
struct se_node_acl *(*tpg_alloc_fabric_acl)(
struct se_portal_group *);
void (*tpg_release_fabric_acl)(struct se_portal_group *,