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authorNicholas Bellinger <nab@linux-iscsi.org>2014-12-19 00:49:23 +0000
committerNicholas Bellinger <nab@linux-iscsi.org>2014-12-19 01:08:32 +0000
commitae450e246e8540300699480a3780a420a028b73f (patch)
tree2ac3b2326af520ac10d25500ed59d0516b9ad443 /drivers/target
parent3875f15207f9ecb3f24a8e91e7ad196899139595 (diff)
downloadlinux-ae450e246e8540300699480a3780a420a028b73f.tar.bz2
target: Allow AllRegistrants to re-RESERVE existing reservation
This patch changes core_scsi3_pro_release() logic to allow an existing AllRegistrants type reservation to be re-reserved by any registered I_T nexus. This addresses a issue where AllRegistrants type RESERVE was receiving RESERVATION_CONFLICT status if dev_pr_res_holder did not match the same I_T nexus, instead of just returning GOOD status following spc4r34 Section 5.9.9: "If the device server receives a PERSISTENT RESERVE OUT command with RESERVE service action where the TYPE field and the SCOPE field contain the same values as the existing type and scope from a persistent reservation holder, it shall not make any change to the existing persistent reservation and shall complete the command with GOOD status." Reported-by: Ilias Tsitsimpis <i.tsitsimpis@gmail.com> Cc: Ilias Tsitsimpis <i.tsitsimpis@gmail.com> Cc: Lee Duncan <lduncan@suse.com> Cc: James Bottomley <James.Bottomley@HansenPartnership.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers/target')
-rw-r--r--drivers/target/target_core_pr.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/target/target_core_pr.c b/drivers/target/target_core_pr.c
index 703890c12071..f75a4baf6e56 100644
--- a/drivers/target/target_core_pr.c
+++ b/drivers/target/target_core_pr.c
@@ -2274,6 +2274,7 @@ core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key)
spin_lock(&dev->dev_reservation_lock);
pr_res_holder = dev->dev_pr_res_holder;
if (pr_res_holder) {
+ int pr_res_type = pr_res_holder->pr_res_type;
/*
* From spc4r17 Section 5.7.9: Reserving:
*
@@ -2284,7 +2285,9 @@ core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key)
* the logical unit, then the command shall be completed with
* RESERVATION CONFLICT status.
*/
- if (pr_res_holder != pr_reg) {
+ if ((pr_res_holder != pr_reg) &&
+ (pr_res_type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) &&
+ (pr_res_type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
pr_err("SPC-3 PR: Attempted RESERVE from"
" [%s]: %s while reservation already held by"