From: Fam Zheng <famz@redhat.com>

Date: Mon, 21 Aug 2017 22:10:07 +0800

Subject: [PATCH] scsi: Introduce scsi_sense_buf_to_errno

This recognizes the "fixed" and "descriptor" format sense data, extracts

the sense key/asc/ascq fields then converts them to an errno.

Signed-off-by: Fam Zheng <famz@redhat.com>

Message-Id: <20170821141008.19383-4-famz@redhat.com>

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

---

 include/scsi/scsi.h |  1 +

 util/scsi.c         | 30 ++++++++++++++++++++++++++++++

 2 files changed, 31 insertions(+)

diff --git a/include/scsi/scsi.h b/include/scsi/scsi.h

index f894ace4bf..fe330385d8 100644

--- a/include/scsi/scsi.h

+++ b/include/scsi/scsi.h

@@ -15,5 +15,6 @@

 #define QEMU_SCSI_H

 int scsi_sense_to_errno(int key, int asc, int ascq);

+int scsi_sense_buf_to_errno(const uint8_t *sense, size_t sense_size);

 #endif

diff --git a/util/scsi.c b/util/scsi.c

index 472eb5bea5..472293d59b 100644

--- a/util/scsi.c

+++ b/util/scsi.c

@@ -58,3 +58,33 @@ int scsi_sense_to_errno(int key, int asc, int ascq)

         return EIO;

     }

 }

+

+int scsi_sense_buf_to_errno(const uint8_t *sense, size_t sense_size)

+{

+    int key, asc, ascq;

+    if (sense_size < 1) {

+        return EIO;

+    }

+    switch (sense[0]) {

+    case 0x70: /* Fixed format sense data. */

+        if (sense_size < 14) {

+            return EIO;

+        }

+        key = sense[2] & 0xF;

+        asc = sense[12];

+        ascq = sense[13];

+        break;

+    case 0x72: /* Descriptor format sense data. */

+        if (sense_size < 4) {

+            return EIO;

+        }

+        key = sense[1] & 0xF;

+        asc = sense[2];

+        ascq = sense[3];

+        break;

+    default:

+        return EIO;

+        break;

+    }

+    return scsi_sense_to_errno(key, asc, ascq);

+}