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-rw-r--r--blockdev.c15
-rw-r--r--qapi/block-core.json13
2 files changed, 19 insertions, 9 deletions
diff --git a/blockdev.c b/blockdev.c
index de5b5f589c..b5d4d6919f 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -2937,7 +2937,7 @@ void qmp_block_stream(bool has_job_id, const char *job_id, const char *device,
bool has_on_error, BlockdevOnError on_error,
Error **errp)
{
- BlockDriverState *bs;
+ BlockDriverState *bs, *iter;
BlockDriverState *base_bs = NULL;
AioContext *aio_context;
Error *local_err = NULL;
@@ -2947,7 +2947,7 @@ void qmp_block_stream(bool has_job_id, const char *job_id, const char *device,
on_error = BLOCKDEV_ON_ERROR_REPORT;
}
- bs = qmp_get_root_bs(device, errp);
+ bs = bdrv_lookup_bs(device, device, errp);
if (!bs) {
return;
}
@@ -2955,10 +2955,6 @@ void qmp_block_stream(bool has_job_id, const char *job_id, const char *device,
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
- if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_STREAM, errp)) {
- goto out;
- }
-
if (has_base) {
base_bs = bdrv_find_backing_image(bs, base);
if (base_bs == NULL) {
@@ -2969,6 +2965,13 @@ void qmp_block_stream(bool has_job_id, const char *job_id, const char *device,
base_name = base;
}
+ /* Check for op blockers in the whole chain between bs and base */
+ for (iter = bs; iter && iter != base_bs; iter = backing_bs(iter)) {
+ if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_STREAM, errp)) {
+ goto out;
+ }
+ }
+
/* if we are streaming the entire chain, the result will have no backing
* file, and specifying one is therefore an error */
if (base_bs == NULL && has_backing_file) {
diff --git a/qapi/block-core.json b/qapi/block-core.json
index 0f2b7032fc..d7a029cfd5 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -1464,6 +1464,13 @@
# with query-block-jobs. The operation can be stopped before it has completed
# using the block-job-cancel command.
#
+# The node that receives the data is called the top image, can be located in
+# any part of the chain (but always above the base image; see below) and can be
+# specified using its device or node name. Earlier qemu versions only allowed
+# 'device' to name the top level node; presence of the 'base-node' parameter
+# during introspection can be used as a witness of the enhanced semantics
+# of 'device'.
+#
# If a base file is specified then sectors are not copied from that base file and
# its backing chain. When streaming completes the image file will have the base
# file as its backing file. This can be used to stream a subset of the backing
@@ -1475,12 +1482,12 @@
# @job-id: #optional identifier for the newly-created block job. If
# omitted, the device name will be used. (Since 2.7)
#
-# @device: the device name or node-name of a root node
+# @device: the device or node name of the top image
#
# @base: #optional the common backing file name
#
-# @backing-file: #optional The backing file string to write into the active
-# layer. This filename is not validated.
+# @backing-file: #optional The backing file string to write into the top
+# image. This filename is not validated.
#
# If a pathname string is such that it cannot be
# resolved by QEMU, that means that subsequent QMP or