Merge remote-tracking branch 'kwolf/for-anthony' into staging

* kwolf/for-anthony:
  qemu-iotests: skip 039 with ./check -nocache
  block: add BLOCK_O_CHECK for qemu-img check
  qcow2: mark image clean after repair succeeds
  qed: mark image clean after repair succeeds
  blockdev: flip default cache mode from writethrough to writeback
  virtio-blk: disable write cache if not negotiated
  virtio-blk: support VIRTIO_BLK_F_CONFIG_WCE
  qemu-iotests: Save some sed processes
  ahci: Fix sglist memleak in ahci_dma_rw_buf()
  ahci: Fix ahci cdrom read corruptions for reads > 128k
  virtio-blk: fix use-after-free while handling scsi commands

4 files changed, 50 insertions, 24 deletions

diff --git a/block/qcow2.c b/block/qcow2.c
index fd5e214431..8f183f1465 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -270,6 +270,20 @@ static int qcow2_mark_clean(BlockDriverState *bs)
     return 0;
 }
 
+static int qcow2_check(BlockDriverState *bs, BdrvCheckResult *result,
+                       BdrvCheckMode fix)
+{
+    int ret = qcow2_check_refcounts(bs, result, fix);
+    if (ret < 0) {
+        return ret;
+    }
+
+    if (fix && result->check_errors == 0 && result->corruptions == 0) {
+        return qcow2_mark_clean(bs);
+    }
+    return ret;
+}
+
 static int qcow2_open(BlockDriverState *bs, int flags)
 {
     BDRVQcowState *s = bs->opaque;
@@ -470,16 +484,11 @@ static int qcow2_open(BlockDriverState *bs, int flags)
     qemu_co_mutex_init(&s->lock);
 
     /* Repair image if dirty */
-    if ((s->incompatible_features & QCOW2_INCOMPAT_DIRTY) &&
-        !bs->read_only) {
+    if (!(flags & BDRV_O_CHECK) && !bs->read_only &&
+        (s->incompatible_features & QCOW2_INCOMPAT_DIRTY)) {
         BdrvCheckResult result = {0};
 
-        ret = qcow2_check_refcounts(bs, &result, BDRV_FIX_ERRORS);
-        if (ret < 0) {
-            goto fail;
-        }
-
-        ret = qcow2_mark_clean(bs);
+        ret = qcow2_check(bs, &result, BDRV_FIX_ERRORS);
         if (ret < 0) {
             goto fail;
         }
@@ -1568,13 +1577,6 @@ static int qcow2_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
     return 0;
 }
 
-
-static int qcow2_check(BlockDriverState *bs, BdrvCheckResult *result,
-                       BdrvCheckMode fix)
-{
-    return qcow2_check_refcounts(bs, result, fix);
-}
-
 #if 0
 static void dump_refcounts(BlockDriverState *bs)
 {
diff --git a/block/qed-check.c b/block/qed-check.c
index 5edf60775b..b473dcd61f 100644
--- a/block/qed-check.c
+++ b/block/qed-check.c
@@ -194,6 +194,28 @@ static void qed_check_for_leaks(QEDCheck *check)
     }
 }
 
+/**
+ * Mark an image clean once it passes check or has been repaired
+ */
+static void qed_check_mark_clean(BDRVQEDState *s, BdrvCheckResult *result)
+{
+    /* Skip if there were unfixable corruptions or I/O errors */
+    if (result->corruptions > 0 || result->check_errors > 0) {
+        return;
+    }
+
+    /* Skip if image is already marked clean */
+    if (!(s->header.features & QED_F_NEED_CHECK)) {
+        return;
+    }
+
+    /* Ensure fixes reach storage before clearing check bit */
+    bdrv_flush(s->bs);
+
+    s->header.features &= ~QED_F_NEED_CHECK;
+    qed_write_header_sync(s);
+}
+
 int qed_check(BDRVQEDState *s, BdrvCheckResult *result, bool fix)
 {
     QEDCheck check = {
@@ -215,6 +237,10 @@ int qed_check(BDRVQEDState *s, BdrvCheckResult *result, bool fix)
     if (ret == 0) {
         /* Only check for leaks if entire image was scanned successfully */
         qed_check_for_leaks(&check);
+
+        if (fix) {
+            qed_check_mark_clean(s, result);
+        }
     }
 
     g_free(check.used_clusters);
diff --git a/block/qed.c b/block/qed.c
index 5f3eefa3af..a02dbfd72d 100644
--- a/block/qed.c
+++ b/block/qed.c
@@ -89,7 +89,7 @@ static void qed_header_cpu_to_le(const QEDHeader *cpu, QEDHeader *le)
     le->backing_filename_size = cpu_to_le32(cpu->backing_filename_size);
 }
 
-static int qed_write_header_sync(BDRVQEDState *s)
+int qed_write_header_sync(BDRVQEDState *s)
 {
     QEDHeader le;
     int ret;
@@ -477,7 +477,7 @@ static int bdrv_qed_open(BlockDriverState *bs, int flags)
     }
 
     /* If image was not closed cleanly, check consistency */
-    if (s->header.features & QED_F_NEED_CHECK) {
+    if (!(flags & BDRV_O_CHECK) && (s->header.features & QED_F_NEED_CHECK)) {
         /* Read-only images cannot be fixed.  There is no risk of corruption
          * since write operations are not possible.  Therefore, allow
          * potentially inconsistent images to be opened read-only.  This can
@@ -491,13 +491,6 @@ static int bdrv_qed_open(BlockDriverState *bs, int flags)
             if (ret) {
                 goto out;
             }
-            if (!result.corruptions && !result.check_errors) {
-                /* Ensure fixes reach storage before clearing check bit */
-                bdrv_flush(s->bs);
-
-                s->header.features &= ~QED_F_NEED_CHECK;
-                qed_write_header_sync(s);
-            }
         }
     }
 
diff --git a/block/qed.h b/block/qed.h
index c716772ad7..a063bf70af 100644
--- a/block/qed.h
+++ b/block/qed.h
@@ -211,6 +211,11 @@ void *gencb_alloc(size_t len, BlockDriverCompletionFunc *cb, void *opaque);
 void gencb_complete(void *opaque, int ret);
 
 /**
+ * Header functions
+ */
+int qed_write_header_sync(BDRVQEDState *s);
+
+/**
  * L2 cache functions
  */
 void qed_init_l2_cache(L2TableCache *l2_cache);