Merge tag 'pull-nbd-2022-04-26' of https://repo.or.cz/qemu/ericb into staging

nbd patches for 2022-04-26

- Paolo Bonzini: thread-safety improvements to NBD client
- Vladimir Sementsov-Ogievsky: finer-grained selection of bitmaps during
  nbd-export

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* tag 'pull-nbd-2022-04-26' of https://repo.or.cz/qemu/ericb:
  nbd: document what is protected by the CoMutexes
  nbd: take receive_mutex when reading requests[].receiving
  nbd: move s->state under requests_lock
  nbd: code motion and function renaming
  nbd: use a QemuMutex to synchronize yanking, reconnection and coroutines
  nbd: keep send_mutex/free_sema handling outside nbd_co_do_establish_connection
  nbd: remove peppering of nbd_client_connected
  nbd: mark more coroutine_fns
  nbd: safeguard against waking up invalid coroutine
  iotests/223: check new possibility of exporting bitmaps by node/name
  qapi: nbd-export: allow select bitmaps by node/name pair
  qapi: rename BlockDirtyBitmapMergeSource to BlockDirtyBitmapOrStr

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

1 files changed, 41 insertions, 22 deletions

diff --git a/nbd/server.c b/nbd/server.c
index c5644fd3f6..4cdbc062c1 100644
--- a/nbd/server.c
+++ b/nbd/server.c
@@ -1643,7 +1643,7 @@ static int nbd_export_create(BlockExport *blk_exp, BlockExportOptions *exp_args,
     uint64_t perm, shared_perm;
     bool readonly = !exp_args->writable;
     bool shared = !exp_args->writable;
-    strList *bitmaps;
+    BlockDirtyBitmapOrStrList *bitmaps;
     size_t i;
     int ret;
 
@@ -1709,37 +1709,56 @@ static int nbd_export_create(BlockExport *blk_exp, BlockExportOptions *exp_args,
     }
     exp->export_bitmaps = g_new0(BdrvDirtyBitmap *, exp->nr_export_bitmaps);
     for (i = 0, bitmaps = arg->bitmaps; bitmaps;
-         i++, bitmaps = bitmaps->next) {
-        const char *bitmap = bitmaps->value;
+         i++, bitmaps = bitmaps->next)
+    {
+        const char *bitmap;
         BlockDriverState *bs = blk_bs(blk);
         BdrvDirtyBitmap *bm = NULL;
 
-        while (bs) {
-            bm = bdrv_find_dirty_bitmap(bs, bitmap);
-            if (bm != NULL) {
-                break;
+        switch (bitmaps->value->type) {
+        case QTYPE_QSTRING:
+            bitmap = bitmaps->value->u.local;
+            while (bs) {
+                bm = bdrv_find_dirty_bitmap(bs, bitmap);
+                if (bm != NULL) {
+                    break;
+                }
+
+                bs = bdrv_filter_or_cow_bs(bs);
             }
 
-            bs = bdrv_filter_or_cow_bs(bs);
-        }
+            if (bm == NULL) {
+                ret = -ENOENT;
+                error_setg(errp, "Bitmap '%s' is not found",
+                           bitmaps->value->u.local);
+                goto fail;
+            }
 
-        if (bm == NULL) {
-            ret = -ENOENT;
-            error_setg(errp, "Bitmap '%s' is not found", bitmap);
-            goto fail;
+            if (readonly && bdrv_is_writable(bs) &&
+                bdrv_dirty_bitmap_enabled(bm)) {
+                ret = -EINVAL;
+                error_setg(errp, "Enabled bitmap '%s' incompatible with "
+                           "readonly export", bitmap);
+                goto fail;
+            }
+            break;
+        case QTYPE_QDICT:
+            bitmap = bitmaps->value->u.external.name;
+            bm = block_dirty_bitmap_lookup(bitmaps->value->u.external.node,
+                                           bitmap, NULL, errp);
+            if (!bm) {
+                ret = -ENOENT;
+                goto fail;
+            }
+            break;
+        default:
+            abort();
         }
 
-        if (bdrv_dirty_bitmap_check(bm, BDRV_BITMAP_ALLOW_RO, errp)) {
-            ret = -EINVAL;
-            goto fail;
-        }
+        assert(bm);
 
-        if (readonly && bdrv_is_writable(bs) &&
-            bdrv_dirty_bitmap_enabled(bm)) {
+        if (bdrv_dirty_bitmap_check(bm, BDRV_BITMAP_ALLOW_RO, errp)) {
             ret = -EINVAL;
-            error_setg(errp,
-                       "Enabled bitmap '%s' incompatible with readonly export",
-                       bitmap);
             goto fail;
         }