qcow2: Put qcow2_upgrade() into its own function

[qemu.git] / block / qcow2.c

diff --git a/block/qcow2.c b/block/qcow2.c
index 7961c05783531dfa636042e8f6ee6cc8d81ebbc8..af087570556ba91f90dc259e144ae7cf4b2d8570 100644 (file)
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -1584,9 +1584,8 @@ static int coroutine_fn qcow2_do_open(BlockDriverState *bs, QDict *options,
     s->snapshots_offset = header.snapshots_offset;
     s->nb_snapshots = header.nb_snapshots;
 
-    ret = qcow2_read_snapshots(bs);
+    ret = qcow2_read_snapshots(bs, errp);
     if (ret < 0) {
-        error_setg_errno(errp, -ret, "Could not read snapshots");
         goto fail;
     }
 
@@ -1835,6 +1834,20 @@ fail:
 static void qcow2_reopen_commit(BDRVReopenState *state)
 {
     qcow2_update_options_commit(state->bs, state->opaque);
+    if (state->flags & BDRV_O_RDWR) {
+        Error *local_err = NULL;
+
+        if (qcow2_reopen_bitmaps_rw(state->bs, &local_err) < 0) {
+            /*
+             * This is not fatal, bitmaps just left read-only, so all following
+             * writes will fail. User can remove read-only bitmaps to unblock
+             * writes or retry reopen.
+             */
+            error_reportf_err(local_err,
+                              "%s: Failed to make dirty bitmaps writable: ",
+                              bdrv_get_node_name(state->bs));
+        }
+    }
     g_free(state->opaque);
 }
 
@@ -1902,6 +1915,8 @@ static int coroutine_fn qcow2_co_block_status(BlockDriverState *bs,
     unsigned int bytes;
     int status = 0;
 
+    qemu_co_mutex_lock(&s->lock);
+
     if (!s->metadata_preallocation_checked) {
         ret = qcow2_detect_metadata_preallocation(bs);
         s->metadata_preallocation = (ret == 1);
@@ -1909,7 +1924,6 @@ static int coroutine_fn qcow2_co_block_status(BlockDriverState *bs,
     }
 
     bytes = MIN(INT_MAX, count);
-    qemu_co_mutex_lock(&s->lock);
     ret = qcow2_get_cluster_offset(bs, offset, &bytes, &cluster_offset);
     qemu_co_mutex_unlock(&s->lock);
     if (ret < 0) {
@@ -2503,7 +2517,7 @@ static int qcow2_inactivate(BlockDriverState *bs)
     int ret, result = 0;
     Error *local_err = NULL;
 
-    qcow2_store_persistent_dirty_bitmaps(bs, &local_err);
+    qcow2_store_persistent_dirty_bitmaps(bs, true, &local_err);
     if (local_err != NULL) {
         result = -EINVAL;
         error_reportf_err(local_err, "Lost persistent bitmaps during "
@@ -4898,12 +4912,46 @@ static int qcow2_downgrade(BlockDriverState *bs, int target_version,
     return 0;
 }
 
+/*
+ * Upgrades an image's version.  While newer versions encompass all
+ * features of older versions, some things may have to be presented
+ * differently.
+ */
+static int qcow2_upgrade(BlockDriverState *bs, int target_version,
+                         BlockDriverAmendStatusCB *status_cb, void *cb_opaque,
+                         Error **errp)
+{
+    BDRVQcow2State *s = bs->opaque;
+    int current_version = s->qcow_version;
+    int ret;
+
+    /* This is qcow2_upgrade(), not qcow2_downgrade() */
+    assert(target_version > current_version);
+
+    /* There are no other versions (yet) that you can upgrade to */
+    assert(target_version == 3);
+
+    status_cb(bs, 0, 1, cb_opaque);
+
+    s->qcow_version = target_version;
+    ret = qcow2_update_header(bs);
+    if (ret < 0) {
+        s->qcow_version = current_version;
+        error_setg_errno(errp, -ret, "Failed to update the image header");
+        return ret;
+    }
+    status_cb(bs, 1, 1, cb_opaque);
+
+    return 0;
+}
+
 typedef enum Qcow2AmendOperation {
     /* This is the value Qcow2AmendHelperCBInfo::last_operation will be
      * statically initialized to so that the helper CB can discern the first
      * invocation from an operation change */
     QCOW2_NO_OPERATION = 0,
 
+    QCOW2_UPGRADING,
     QCOW2_CHANGING_REFCOUNT_ORDER,
     QCOW2_DOWNGRADING,
 } Qcow2AmendOperation;
@@ -5086,17 +5134,16 @@ static int qcow2_amend_options(BlockDriverState *bs, QemuOpts *opts,
     helper_cb_info = (Qcow2AmendHelperCBInfo){
         .original_status_cb = status_cb,
         .original_cb_opaque = cb_opaque,
-        .total_operations = (new_version < old_version)
+        .total_operations = (new_version != old_version)
                           + (s->refcount_bits != refcount_bits)
     };
 
     /* Upgrade first (some features may require compat=1.1) */
     if (new_version > old_version) {
-        s->qcow_version = new_version;
-        ret = qcow2_update_header(bs);
+        helper_cb_info.current_operation = QCOW2_UPGRADING;
+        ret = qcow2_upgrade(bs, new_version, &qcow2_amend_helper_cb,
+                            &helper_cb_info, errp);
         if (ret < 0) {
-            s->qcow_version = old_version;
-            error_setg_errno(errp, -ret, "Failed to update the image header");
             return ret;
         }
     }
@@ -5406,9 +5453,9 @@ BlockDriver bdrv_qcow2 = {
     .bdrv_detach_aio_context  = qcow2_detach_aio_context,
     .bdrv_attach_aio_context  = qcow2_attach_aio_context,
 
-    .bdrv_reopen_bitmaps_rw = qcow2_reopen_bitmaps_rw,
-    .bdrv_can_store_new_dirty_bitmap = qcow2_can_store_new_dirty_bitmap,
-    .bdrv_remove_persistent_dirty_bitmap = qcow2_remove_persistent_dirty_bitmap,
+    .bdrv_co_can_store_new_dirty_bitmap = qcow2_co_can_store_new_dirty_bitmap,
+    .bdrv_co_remove_persistent_dirty_bitmap =
+            qcow2_co_remove_persistent_dirty_bitmap,
 };
 
 static void bdrv_qcow2_init(void)