scsi: add multipath support to qemu-pr-helper

Proper support of persistent reservation for multipath devices requires
communication with the multipath daemon, so that the reservation is
registered and applied when a path comes up.  The device mapper
utilities provide a library to do so; this patch makes qemu-pr-helper.c
detect multipath devices and, when one is found, delegate the operation
to libmpathpersist.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/scsi/utils.c b/scsi/utils.c
index fab60bdf20..5684951b12 100644
--- a/scsi/utils.c
+++ b/scsi/utils.c
@@ -206,6 +206,11 @@ const struct SCSISense sense_code_OVERLAPPED_COMMANDS = {
     .key = ABORTED_COMMAND, .asc = 0x4e, .ascq = 0x00
 };
 
+/* Command aborted, LUN Communication Failure */
+const struct SCSISense sense_code_LUN_COMM_FAILURE = {
+    .key = ABORTED_COMMAND, .asc = 0x08, .ascq = 0x00
+};
+
 /* Unit attention, Capacity data has changed */
 const struct SCSISense sense_code_CAPACITY_CHANGED = {
     .key = UNIT_ATTENTION, .asc = 0x2a, .ascq = 0x09
@@ -216,6 +221,11 @@ const struct SCSISense sense_code_RESET = {
     .key = UNIT_ATTENTION, .asc = 0x29, .ascq = 0x00
 };
 
+/* Unit attention, SCSI bus reset */
+const struct SCSISense sense_code_SCSI_BUS_RESET = {
+    .key = UNIT_ATTENTION, .asc = 0x29, .ascq = 0x02
+};
+
 /* Unit attention, No medium */
 const struct SCSISense sense_code_UNIT_ATTENTION_NO_MEDIUM = {
     .key = UNIT_ATTENTION, .asc = 0x3a, .ascq = 0x00