This patch makes the 'device' paramater of the 'block-stream' command
allow a node name as well as a device name.
In addition to that, operation blockers will be checked in all
intermediate nodes between the top and the base node.
Signed-off-by: Alberto Garcia <be...@igalia.com>
---
blockdev.c | 20 ++++++++++----------
qapi/block-core.json | 10 +++++++---
2 files changed, 17 insertions(+), 13 deletions(-)
diff --git a/blockdev.c b/blockdev.c
index dc5d931..f24cf2d 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -2104,8 +2104,7 @@ void qmp_block_stream(const char *device,
bool has_on_error, BlockdevOnError on_error,
Error **errp)
{
- BlockBackend *blk;
- BlockDriverState *bs;
+ BlockDriverState *bs, *i;
BlockDriverState *base_bs = NULL;
AioContext *aio_context;
Error *local_err = NULL;
@@ -2115,20 +2114,14 @@ void qmp_block_stream(const char *device,
on_error = BLOCKDEV_ON_ERROR_REPORT;
}
- blk = blk_by_name(device);
- if (!blk) {
- error_set(errp, QERR_DEVICE_NOT_FOUND, device);
+ bs = bdrv_lookup_bs(device, device, errp);
+ if (!bs) {
return;
}
- bs = blk_bs(blk);
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) {
@@ -2139,6 +2132,13 @@ void qmp_block_stream(const char *device,
base_name = base;
}
+ /* Check for op blockers in the whole chain between bs and base */
+ for (i = bs; i != NULL && i != base_bs; i = i->backing_hd) {
+ if (bdrv_op_is_blocked(i, 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 3639454..60b9664 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -1014,6 +1014,10 @@
# 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 whole chain and can be specified using its device
+# or node name.
+#
# 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
@@ -1022,12 +1026,12 @@
# On successful completion the image file is updated to drop the backing file
# and the BLOCK_JOB_COMPLETED event is emitted.
#
-# @device: the device name
+# @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
--
2.1.4
