build-sys: fix meson project version usage

[qmiga/qemu.git] / block / stream.c

diff --git a/block/stream.c b/block/stream.c
index 2781441..01fe7c0 100644 (file)
--- a/block/stream.c
+++ b/block/stream.c
@@ -53,8 +53,8 @@ static int coroutine_fn stream_populate(BlockBackend *blk,
 static int stream_prepare(Job *job)
 {
     StreamBlockJob *s = container_of(job, StreamBlockJob, common.job);
-    BlockDriverState *unfiltered_bs = bdrv_skip_filters(s->target_bs);
-    BlockDriverState *unfiltered_bs_cow = bdrv_cow_bs(unfiltered_bs);
+    BlockDriverState *unfiltered_bs;
+    BlockDriverState *unfiltered_bs_cow;
     BlockDriverState *base;
     BlockDriverState *unfiltered_base;
     Error *local_err = NULL;
@@ -62,6 +62,11 @@ static int stream_prepare(Job *job)
 
     GLOBAL_STATE_CODE();
 
+    bdrv_graph_rdlock_main_loop();
+    unfiltered_bs = bdrv_skip_filters(s->target_bs);
+    unfiltered_bs_cow = bdrv_cow_bs(unfiltered_bs);
+    bdrv_graph_rdunlock_main_loop();
+
     /* We should drop filter at this point, as filter hold the backing chain */
     bdrv_cor_filter_drop(s->cor_filter_bs);
     s->cor_filter_bs = NULL;
@@ -85,7 +90,7 @@ static int stream_prepare(Job *job)
     unfiltered_base = bdrv_skip_filters(base);
     bdrv_graph_rdunlock_main_loop();
 
-    if (bdrv_cow_child(unfiltered_bs)) {
+    if (unfiltered_bs_cow) {
         const char *base_id = NULL, *base_fmt = NULL;
         if (unfiltered_base) {
             base_id = s->backing_file_str ?: unfiltered_base->filename;
@@ -94,7 +99,9 @@ static int stream_prepare(Job *job)
             }
         }
 
+        bdrv_graph_wrlock(s->target_bs);
         bdrv_set_backing_hd_drained(unfiltered_bs, base, &local_err);
+        bdrv_graph_wrunlock(s->target_bs);
 
         /*
          * This call will do I/O, so the graph can change again from here on.
@@ -142,18 +149,19 @@ static void stream_clean(Job *job)
 static int coroutine_fn stream_run(Job *job, Error **errp)
 {
     StreamBlockJob *s = container_of(job, StreamBlockJob, common.job);
-    BlockDriverState *unfiltered_bs = bdrv_skip_filters(s->target_bs);
+    BlockDriverState *unfiltered_bs;
     int64_t len;
     int64_t offset = 0;
     int error = 0;
     int64_t n = 0; /* bytes */
 
-    if (unfiltered_bs == s->base_overlay) {
-        /* Nothing to stream */
-        return 0;
-    }
-
     WITH_GRAPH_RDLOCK_GUARD() {
+        unfiltered_bs = bdrv_skip_filters(s->target_bs);
+        if (unfiltered_bs == s->base_overlay) {
+            /* Nothing to stream */
+            return 0;
+        }
+
         len = bdrv_co_getlength(s->target_bs);
         if (len < 0) {
             return len;
@@ -260,6 +268,8 @@ void stream_start(const char *job_id, BlockDriverState *bs,
     assert(!(base && bottom));
     assert(!(backing_file_str && bottom));
 
+    bdrv_graph_rdlock_main_loop();
+
     if (bottom) {
         /*
          * New simple interface. The code is written in terms of old interface
@@ -272,13 +282,11 @@ void stream_start(const char *job_id, BlockDriverState *bs,
         assert(!bottom->drv->is_filter);
         base_overlay = above_base = bottom;
     } else {
-        GRAPH_RDLOCK_GUARD_MAINLOOP();
-
         base_overlay = bdrv_find_overlay(bs, base);
         if (!base_overlay) {
             error_setg(errp, "'%s' is not in the backing chain of '%s'",
                        base->node_name, bs->node_name);
-            return;
+            goto out_rdlock;
         }
 
         /*
@@ -300,7 +308,7 @@ void stream_start(const char *job_id, BlockDriverState *bs,
     if (bs_read_only) {
         /* Hold the chain during reopen */
         if (bdrv_freeze_backing_chain(bs, above_base, errp) < 0) {
-            return;
+            goto out_rdlock;
         }
 
         ret = bdrv_reopen_set_read_only(bs, false, errp);
@@ -309,10 +317,12 @@ void stream_start(const char *job_id, BlockDriverState *bs,
         bdrv_unfreeze_backing_chain(bs, above_base);
 
         if (ret < 0) {
-            return;
+            goto out_rdlock;
         }
     }
 
+    bdrv_graph_rdunlock_main_loop();
+
     opts = qdict_new();
 
     qdict_put_str(opts, "driver", "copy-on-read");
@@ -359,7 +369,7 @@ void stream_start(const char *job_id, BlockDriverState *bs,
     bdrv_graph_wrlock(bs);
     if (block_job_add_bdrv(&s->common, "active node", bs, 0,
                            basic_flags | BLK_PERM_WRITE, errp)) {
-        bdrv_graph_wrunlock();
+        bdrv_graph_wrunlock(bs);
         goto fail;
     }
 
@@ -379,11 +389,11 @@ void stream_start(const char *job_id, BlockDriverState *bs,
         ret = block_job_add_bdrv(&s->common, "intermediate node", iter, 0,
                                  basic_flags, errp);
         if (ret < 0) {
-            bdrv_graph_wrunlock();
+            bdrv_graph_wrunlock(bs);
             goto fail;
         }
     }
-    bdrv_graph_wrunlock();
+    bdrv_graph_wrunlock(bs);
 
     s->base_overlay = base_overlay;
     s->above_base = above_base;
@@ -407,4 +417,8 @@ fail:
     if (bs_read_only) {
         bdrv_reopen_set_read_only(bs, true, NULL);
     }
+    return;
+
+out_rdlock:
+    bdrv_graph_rdunlock_main_loop();
 }