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authorNicholas Bellinger <nab@linux-iscsi.org>2014-06-05 23:37:00 -0700
committerNicholas Bellinger <nab@linux-iscsi.org>2014-06-06 01:21:12 -0700
commite7810c2d2c37fa8e58dda74b00790dab60fe6fba (patch)
treefe484bce9b8121904c2ae08f0eee246e757caca3 /drivers/target
parent2363d196686e44c0158929e7cf96c8589a24a81b (diff)
downloadlinux-e7810c2d2c37fa8e58dda74b00790dab60fe6fba.tar.bz2
target: Allow READ_CAPACITY opcode in ALUA Standby access state
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. 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> Cc: stable@vger.kernel.org Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.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 fcbe6125b73e..63512cc01a1f 100644
--- a/drivers/target/target_core_alua.c
+++ b/drivers/target/target_core_alua.c
@@ -576,7 +576,16 @@ 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:
+ set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
+ return 1;
+ }
case MAINTENANCE_IN:
switch (cdb[1] & 0x1f) {
case MI_REPORT_TARGET_PGS: