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target: Ensure sess_prot_type is saved across session restart

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The following incremental patch saves the current sess_prot_type into
se_node_acl, and will always reset sess_prot_type if a previous saved
value exists.  So the PI setting for the fabric's session with backend
devices not supporting PI is persistent across session restart.

(Fix se_node_acl dereference for discovery sessions - DanCarpenter)

Reviewed-by: Martin Petersen <martin.petersen@oracle.com>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Nicholas Bellinger 2015-04-14 11:52:22 -07:00
parent bfd9a53e01
commit bffb5128f9
2 changed files with 16 additions and 7 deletions
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22
drivers/target/target_core_transport.c
View File

@ -327,13 +327,6 @@ void __transport_register_session(
se_sess->se_tpg = se_tpg;
se_sess->fabric_sess_ptr = fabric_sess_ptr;
/*
* Determine if fabric allows for T10-PI feature bits to be exposed
* to initiators for device backends with !dev->dev_attrib.pi_prot_type
*/
if (tfo->tpg_check_prot_fabric_only)
se_sess->sess_prot_type = tfo->tpg_check_prot_fabric_only(se_tpg);
/*
* Used by struct se_node_acl's under ConfigFS to locate active se_session-t
*
@ -341,6 +334,21 @@ void __transport_register_session(
* eg: *NOT* discovery sessions.
*/
if (se_nacl) {
/*
*
* Determine if fabric allows for T10-PI feature bits exposed to
* initiators for device backends with !dev->dev_attrib.pi_prot_type.
*
* If so, then always save prot_type on a per se_node_acl node
* basis and re-instate the previous sess_prot_type to avoid
* disabling PI from below any previously initiator side
* registered LUNs.
*/
if (se_nacl->saved_prot_type)
se_sess->sess_prot_type = se_nacl->saved_prot_type;
else if (tfo->tpg_check_prot_fabric_only)
se_sess->sess_prot_type = se_nacl->saved_prot_type =
tfo->tpg_check_prot_fabric_only(se_tpg);
/*
* If the fabric module supports an ISID based TransportID,
* save this value in binary from the fabric I_T Nexus now.

1
include/target/target_core_base.h
View File

@ -589,6 +589,7 @@ struct se_node_acl {
bool acl_stop:1;
u32 queue_depth;
u32 acl_index;
enum target_prot_type saved_prot_type;
#define MAX_ACL_TAG_SIZE 64
char acl_tag[MAX_ACL_TAG_SIZE];
/* Used for PR SPEC_I_PT=1 and REGISTER_AND_MOVE */