[PATCH 1/7] scsi-disk: Add sg_io callback to evaluate status

[Hannes Reinecke <hare@suse.de>]

Add a separate sg_io callback to allow us to evaluate the various
states returned by the SG_IO ioctl.

Signed-off-by: Hannes Reinecke <hare@suse.de>
---
 hw/scsi/scsi-disk.c | 28 ++++++++++++++++++++++------
 1 file changed, 22 insertions(+), 6 deletions(-)

diff --git a/hw/scsi/scsi-disk.c b/hw/scsi/scsi-disk.c
index dd23a38d6a..5d6c892f29 100644
--- a/hw/scsi/scsi-disk.c
+++ b/hw/scsi/scsi-disk.c
@@ -76,7 +76,6 @@ typedef struct SCSIDiskReq {
     struct iovec iov;
     QEMUIOVector qiov;
     BlockAcctCookie acct;
-    unsigned char *status;
 } SCSIDiskReq;
 
 #define SCSI_DISK_F_REMOVABLE             0
@@ -188,7 +187,7 @@ static bool scsi_disk_req_check_error(SCSIDiskReq *r, int ret, bool acct_failed)
         return true;
     }
 
-    if (ret < 0 || (r->status && *r->status)) {
+    if (ret < 0 || r->req.status) {
         return scsi_handle_rw_error(r, -ret, acct_failed);
     }
 
@@ -452,11 +451,11 @@ static bool scsi_handle_rw_error(SCSIDiskReq *r, int error, bool acct_failed)
              * whether the error has to be handled by the guest or should rather
              * pause the host.
              */
-            assert(r->status && *r->status);
+            assert(r->req.status);
             if (scsi_sense_buf_is_guest_recoverable(r->req.sense, sizeof(r->req.sense))) {
                 /* These errors are handled by guest. */
                 sdc->update_sense(&r->req);
-                scsi_req_complete(&r->req, *r->status);
+                scsi_req_complete(&r->req, r->req.status);
                 return true;
             }
             error = scsi_sense_buf_to_errno(r->req.sense, sizeof(r->req.sense));
@@ -2688,8 +2687,24 @@ typedef struct SCSIBlockReq {
 
     /* CDB passed to SG_IO.  */
     uint8_t cdb[16];
+    BlockCompletionFunc *cb;
+    void *cb_opaque;
 } SCSIBlockReq;
 
+static void scsi_block_sgio_complete(void *opaque, int ret)
+{
+    SCSIBlockReq *req = (SCSIBlockReq *)opaque;
+    SCSIDiskReq *r = &req->req;
+    SCSISense sense;
+
+    r->req.status = sg_io_sense_from_errno(-ret, &req->io_header, &sense);
+    if (r->req.status == CHECK_CONDITION &&
+        req->io_header.status != CHECK_CONDITION)
+        scsi_req_build_sense(&r->req, sense);
+
+    req->cb(req->cb_opaque, ret);
+}
+
 static BlockAIOCB *scsi_block_do_sgio(SCSIBlockReq *req,
                                       int64_t offset, QEMUIOVector *iov,
                                       int direction,
@@ -2768,9 +2783,11 @@ static BlockAIOCB *scsi_block_do_sgio(SCSIBlockReq *req,
     io_header->timeout = s->qdev.io_timeout * 1000;
     io_header->usr_ptr = r;
     io_header->flags |= SG_FLAG_DIRECT_IO;
+    req->cb = cb;
+    req->cb_opaque = opaque;
     trace_scsi_disk_aio_sgio_command(r->req.tag, req->cdb[0], lba,
                                      nb_logical_blocks, io_header->timeout);
-    aiocb = blk_aio_ioctl(s->qdev.conf.blk, SG_IO, io_header, cb, opaque);
+    aiocb = blk_aio_ioctl(s->qdev.conf.blk, SG_IO, io_header, scsi_block_sgio_complete, req);
     assert(aiocb != NULL);
     return aiocb;
 }
@@ -2884,7 +2901,6 @@ static int32_t scsi_block_dma_command(SCSIRequest *req, uint8_t *buf)
         return 0;
     }
 
-    r->req.status = &r->io_header.status;
     return scsi_disk_dma_command(req, buf);
 }
 
-- 
2.16.4