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authorNicholas Bellinger <nab@linux-iscsi.org>2014-06-05 23:37:00 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-06-16 13:42:53 -0700
commitc39e89784d7319f6e87d6bfb17e75fd8b95e07e2 (patch)
tree127e7de46a5ecf5c04ba7c63d33e5080e5cd9d10 /drivers/target
parentd5c55fa31a2947ac517abddd7ca6975a17bef178 (diff)
downloadlinux-linaro-stable-c39e89784d7319f6e87d6bfb17e75fd8b95e07e2.tar.gz
target: Allow READ_CAPACITY opcode in ALUA Standby access state
commit e7810c2d2c37fa8e58dda74b00790dab60fe6fba upstream. This patch allows READ_CAPACITY + SAI_READ_CAPACITY_16 opcode processing to occur while the associated ALUA group is in Standby access state. This is required to avoid host side LUN probe failures during the initial scan if an ALUA group has already implicitly changed into Standby access state. This addresses a bug reported by Chris + Philip using dm-multipath + ESX hosts configured with ALUA multipath. (Drop v3.15 specific set_ascq usage - nab) Reported-by: Chris Boot <crb@tiger-computing.co.uk> Reported-by: Philip Gaw <pgaw@darktech.org.uk> Cc: Chris Boot <crb@tiger-computing.co.uk> Cc: Philip Gaw <pgaw@darktech.org.uk> Cc: Hannes Reinecke <hare@suse.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/target')
-rw-r--r--drivers/target/target_core_alua.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/target/target_core_alua.c b/drivers/target/target_core_alua.c
index f608fbc14a27..df58a67f81e0 100644
--- a/drivers/target/target_core_alua.c
+++ b/drivers/target/target_core_alua.c
@@ -409,7 +409,16 @@ static inline int core_alua_state_standby(
case REPORT_LUNS:
case RECEIVE_DIAGNOSTIC:
case SEND_DIAGNOSTIC:
+ case READ_CAPACITY:
return 0;
+ case SERVICE_ACTION_IN:
+ switch (cdb[1] & 0x1f) {
+ case SAI_READ_CAPACITY_16:
+ return 0;
+ default:
+ *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY;
+ return 1;
+ }
case MAINTENANCE_IN:
switch (cdb[1] & 0x1f) {
case MI_REPORT_TARGET_PGS: