block: bdrv/blk_co_unref() for calls in coroutine context

These functions must not be called in coroutine context, because they
need write access to the graph.

Cc: qemu-stable@nongnu.org
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20230504115750.54437-4-kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

diff --git a/block.c b/block.c
index 5ec1a3897e08f24a6f6c28938c3adfeb16188ef6..20d5ee09596446a2c8e58e5d04d4997f9967928e 100644 (file)
--- a/block.c
+++ b/block.c
@@ -680,7 +680,7 @@ int coroutine_fn bdrv_co_create_opts_simple(BlockDriver *drv,
 
     ret = 0;
 out:
-    blk_unref(blk);
+    blk_co_unref(blk);
     return ret;
 }
 

diff --git a/block/crypto.c b/block/crypto.c
index ca67289187eedecad7fcd96204d475bd069853e6..8fd3ad0054512fc71caca4627e4e06253c4d1cc8 100644 (file)
--- a/block/crypto.c
+++ b/block/crypto.c
@@ -355,7 +355,7 @@ block_crypto_co_create_generic(BlockDriverState *bs, int64_t size,
     ret = 0;
  cleanup:
     qcrypto_block_free(crypto);
-    blk_unref(blk);
+    blk_co_unref(blk);
     return ret;
 }
 
@@ -661,7 +661,7 @@ block_crypto_co_create_luks(BlockdevCreateOptions *create_options, Error **errp)
 
     ret = 0;
 fail:
-    bdrv_unref(bs);
+    bdrv_co_unref(bs);
     return ret;
 }
 
@@ -730,7 +730,7 @@ fail:
         bdrv_co_delete_file_noerr(bs);
     }
 
-    bdrv_unref(bs);
+    bdrv_co_unref(bs);
     qapi_free_QCryptoBlockCreateOptions(create_opts);
     qobject_unref(cryptoopts);
     return ret;

diff --git a/block/parallels.c b/block/parallels.c
index 013684801a61af4cd7cab346fdd67a4bcea63ec2..b49c35929ebe694ce3d1b613247cf1ad0ffcfaf5 100644 (file)
--- a/block/parallels.c
+++ b/block/parallels.c
@@ -613,8 +613,8 @@ static int coroutine_fn parallels_co_create(BlockdevCreateOptions* opts,
 
     ret = 0;
 out:
-    blk_unref(blk);
-    bdrv_unref(bs);
+    blk_co_unref(blk);
+    bdrv_co_unref(bs);
     return ret;
 
 exit:
@@ -691,7 +691,7 @@ parallels_co_create_opts(BlockDriver *drv, const char *filename,
 
 done:
     qobject_unref(qdict);
-    bdrv_unref(bs);
+    bdrv_co_unref(bs);
     qapi_free_BlockdevCreateOptions(create_options);
     return ret;
 }

diff --git a/block/qcow.c b/block/qcow.c
index 490e4f819ed15e01a681d70b01fc5349514a7246..a0c701f578adb1daa60ed0759eb1649818f4b8c9 100644 (file)
--- a/block/qcow.c
+++ b/block/qcow.c
@@ -915,8 +915,8 @@ static int coroutine_fn qcow_co_create(BlockdevCreateOptions *opts,
     g_free(tmp);
     ret = 0;
 exit:
-    blk_unref(qcow_blk);
-    bdrv_unref(bs);
+    blk_co_unref(qcow_blk);
+    bdrv_co_unref(bs);
     qcrypto_block_free(crypto);
     return ret;
 }
@@ -1015,7 +1015,7 @@ qcow_co_create_opts(BlockDriver *drv, const char *filename,
 fail:
     g_free(backing_fmt);
     qobject_unref(qdict);
-    bdrv_unref(bs);
+    bdrv_co_unref(bs);
     qapi_free_BlockdevCreateOptions(create_options);
     return ret;
 }

diff --git a/block/qcow2.c b/block/qcow2.c
index 94cf59af8bcbbd64e4d2a9a8aadeafab1c76c9ce..01742b3ebe205c0a634b09d90affb7a953a6cb46 100644 (file)
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -3705,7 +3705,7 @@ qcow2_co_create(BlockdevCreateOptions *create_options, Error **errp)
         goto out;
     }
 
-    blk_unref(blk);
+    blk_co_unref(blk);
     blk = NULL;
 
     /*
@@ -3785,7 +3785,7 @@ qcow2_co_create(BlockdevCreateOptions *create_options, Error **errp)
         }
     }
 
-    blk_unref(blk);
+    blk_co_unref(blk);
     blk = NULL;
 
     /* Reopen the image without BDRV_O_NO_FLUSH to flush it before returning.
@@ -3810,9 +3810,9 @@ qcow2_co_create(BlockdevCreateOptions *create_options, Error **errp)
 
     ret = 0;
 out:
-    blk_unref(blk);
-    bdrv_unref(bs);
-    bdrv_unref(data_bs);
+    blk_co_unref(blk);
+    bdrv_co_unref(bs);
+    bdrv_co_unref(data_bs);
     return ret;
 }
 
@@ -3943,8 +3943,8 @@ finish:
     }
 
     qobject_unref(qdict);
-    bdrv_unref(bs);
-    bdrv_unref(data_bs);
+    bdrv_co_unref(bs);
+    bdrv_co_unref(data_bs);
     qapi_free_BlockdevCreateOptions(create_options);
     return ret;
 }

diff --git a/block/qed.c b/block/qed.c
index 0705a7b4e25f15e96197f51aaf7ec05d2fe56d03..aff2a2076e6caa04e2f3ee62120300e56d8005a0 100644 (file)
--- a/block/qed.c
+++ b/block/qed.c
@@ -748,8 +748,8 @@ static int coroutine_fn bdrv_qed_co_create(BlockdevCreateOptions *opts,
     ret = 0; /* success */
 out:
     g_free(l1_table);
-    blk_unref(blk);
-    bdrv_unref(bs);
+    blk_co_unref(blk);
+    bdrv_co_unref(bs);
     return ret;
 }
 
@@ -819,7 +819,7 @@ bdrv_qed_co_create_opts(BlockDriver *drv, const char *filename,
 
 fail:
     qobject_unref(qdict);
-    bdrv_unref(bs);
+    bdrv_co_unref(bs);
     qapi_free_BlockdevCreateOptions(create_options);
     return ret;
 }

diff --git a/block/vdi.c b/block/vdi.c
index f2434d6153e1a9b8bc947f131a8c488c1a24ef46..08331d2dd7b5879ab1aa8e7873fc9d0d294e1531 100644 (file)
--- a/block/vdi.c
+++ b/block/vdi.c
@@ -886,8 +886,8 @@ static int coroutine_fn vdi_co_do_create(BlockdevCreateOptions *create_options,
 
     ret = 0;
 exit:
-    blk_unref(blk);
-    bdrv_unref(bs_file);
+    blk_co_unref(blk);
+    bdrv_co_unref(bs_file);
     g_free(bmap);
     return ret;
 }
@@ -975,7 +975,7 @@ vdi_co_create_opts(BlockDriver *drv, const char *filename,
 done:
     qobject_unref(qdict);
     qapi_free_BlockdevCreateOptions(create_options);
-    bdrv_unref(bs_file);
+    bdrv_co_unref(bs_file);
     return ret;
 }
 

diff --git a/block/vhdx.c b/block/vhdx.c
index 81420722a188e1dfe1b6385e1fbc0c2b0d7dfb13..00777da91a5231288fe71567c7bbe45c46177814 100644 (file)
--- a/block/vhdx.c
+++ b/block/vhdx.c
@@ -2053,8 +2053,8 @@ static int coroutine_fn vhdx_co_create(BlockdevCreateOptions *opts,
 
     ret = 0;
 delete_and_exit:
-    blk_unref(blk);
-    bdrv_unref(bs);
+    blk_co_unref(blk);
+    bdrv_co_unref(bs);
     g_free(creator);
     return ret;
 }
@@ -2144,7 +2144,7 @@ vhdx_co_create_opts(BlockDriver *drv, const char *filename,
 
 fail:
     qobject_unref(qdict);
-    bdrv_unref(bs);
+    bdrv_co_unref(bs);
     qapi_free_BlockdevCreateOptions(create_options);
     return ret;
 }

diff --git a/block/vmdk.c b/block/vmdk.c
index 3f8c731e32e87820a5cc02d22e9e9884fd908a86..11b553ef25bad2c52722e5f2db16d87fc7de2263 100644 (file)
--- a/block/vmdk.c
+++ b/block/vmdk.c
@@ -2306,7 +2306,7 @@ exit:
         if (pbb) {
             *pbb = blk;
         } else {
-            blk_unref(blk);
+            blk_co_unref(blk);
             blk = NULL;
         }
     }
@@ -2516,12 +2516,12 @@ vmdk_co_do_create(int64_t size,
         if (strcmp(blk_bs(backing)->drv->format_name, "vmdk")) {
             error_setg(errp, "Invalid backing file format: %s. Must be vmdk",
                        blk_bs(backing)->drv->format_name);
-            blk_unref(backing);
+            blk_co_unref(backing);
             ret = -EINVAL;
             goto exit;
         }
         ret = vmdk_read_cid(blk_bs(backing), 0, &parent_cid);
-        blk_unref(backing);
+        blk_co_unref(backing);
         if (ret) {
             error_setg(errp, "Failed to read parent CID");
             goto exit;
@@ -2542,14 +2542,14 @@ vmdk_co_do_create(int64_t size,
                              blk_bs(extent_blk)->filename);
         created_size += cur_size;
         extent_idx++;
-        blk_unref(extent_blk);
+        blk_co_unref(extent_blk);
     }
 
     /* Check whether we got excess extents */
     extent_blk = extent_fn(-1, extent_idx, flat, split, compress, zeroed_grain,
                            opaque, NULL);
     if (extent_blk) {
-        blk_unref(extent_blk);
+        blk_co_unref(extent_blk);
         error_setg(errp, "List of extents contains unused extents");
         ret = -EINVAL;
         goto exit;
@@ -2590,7 +2590,7 @@ vmdk_co_do_create(int64_t size,
     ret = 0;
 exit:
     if (blk) {
-        blk_unref(blk);
+        blk_co_unref(blk);
     }
     g_free(desc);
     g_free(parent_desc_line);
@@ -2641,7 +2641,7 @@ vmdk_co_create_opts_cb(int64_t size, int idx, bool flat, bool split,
                            errp)) {
         goto exit;
     }
-    bdrv_unref(bs);
+    bdrv_co_unref(bs);
 exit:
     g_free(ext_filename);
     return blk;
@@ -2797,12 +2797,12 @@ static BlockBackend * coroutine_fn vmdk_co_create_cb(int64_t size, int idx,
         return NULL;
     }
     blk_set_allow_write_beyond_eof(blk, true);
-    bdrv_unref(bs);
+    bdrv_co_unref(bs);
 
     if (size != -1) {
         ret = vmdk_init_extent(blk, size, flat, compress, zeroed_grain, errp);
         if (ret) {
-            blk_unref(blk);
+            blk_co_unref(blk);
             blk = NULL;
         }
     }

diff --git a/block/vpc.c b/block/vpc.c
index b89b0ff8e27568da4aeb81a0e2e16ea70603a9c1..07ddda5b993166e4dd3c024a3383a20a7356c904 100644 (file)
--- a/block/vpc.c
+++ b/block/vpc.c
@@ -1082,8 +1082,8 @@ static int coroutine_fn vpc_co_create(BlockdevCreateOptions *opts,
     }
 
 out:
-    blk_unref(blk);
-    bdrv_unref(bs);
+    blk_co_unref(blk);
+    bdrv_co_unref(bs);
     return ret;
 }
 
@@ -1162,7 +1162,7 @@ vpc_co_create_opts(BlockDriver *drv, const char *filename,
 
 fail:
     qobject_unref(qdict);
-    bdrv_unref(bs);
+    bdrv_co_unref(bs);
     qapi_free_BlockdevCreateOptions(create_options);
     return ret;
 }

diff --git a/include/block/block-global-state.h b/include/block/block-global-state.h
index 2c312cc77471fdaf90f60a6c9e5bac414d36fc59..ec3ddb17a8c7ad43323e8bddbfb62b957bb71b21 100644 (file)
--- a/include/block/block-global-state.h
+++ b/include/block/block-global-state.h
@@ -218,7 +218,8 @@ void bdrv_img_create(const char *filename, const char *fmt,
                      bool quiet, Error **errp);
 
 void bdrv_ref(BlockDriverState *bs);
-void bdrv_unref(BlockDriverState *bs);
+void no_coroutine_fn bdrv_unref(BlockDriverState *bs);
+void coroutine_fn no_co_wrapper bdrv_co_unref(BlockDriverState *bs);
 void bdrv_unref_child(BlockDriverState *parent, BdrvChild *child);
 BdrvChild *bdrv_attach_child(BlockDriverState *parent_bs,
                              BlockDriverState *child_bs,

diff --git a/include/sysemu/block-backend-global-state.h b/include/sysemu/block-backend-global-state.h
index 2b6d27db7c721a6744814a1a7740e47efbbda760..fa83f9389c3caf6237274104b411ea2b9eb5df79 100644 (file)
--- a/include/sysemu/block-backend-global-state.h
+++ b/include/sysemu/block-backend-global-state.h
@@ -42,7 +42,10 @@ blk_co_new_open(const char *filename, const char *reference, QDict *options,
 
 int blk_get_refcnt(BlockBackend *blk);
 void blk_ref(BlockBackend *blk);
-void blk_unref(BlockBackend *blk);
+
+void no_coroutine_fn blk_unref(BlockBackend *blk);
+void coroutine_fn no_co_wrapper blk_co_unref(BlockBackend *blk);
+
 void blk_remove_all_bs(void);
 BlockBackend *blk_by_name(const char *name);
 BlockBackend *blk_next(BlockBackend *blk);