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block: Add 'x-blockdev-del' QMP command

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This command is still experimental, hence the name.

This is the companion to 'blockdev-add'. It allows deleting a
BlockBackend with its associated BlockDriverState tree, or a
BlockDriverState that is not attached to any backend.

In either case, the command fails if the reference count is greater
than 1 or the BlockDriverState has any parents.

Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-id: 6cfc148c77aca1da942b094d811bfa3fcf7ac7bb.1446475331.git.berto@igalia.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Alberto Garcia 2015-11-02 16:51:55 +02:00 • committed by Max Reitz
parent f636ae85f3
commit 81b936ae70
3 changed files with 155 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

66
blockdev.c
View file

@ -3479,6 +3479,72 @@ fail:
qmp_output_visitor_cleanup(ov);
}
void qmp_x_blockdev_del(bool has_id, const char *id,
bool has_node_name, const char *node_name, Error **errp)
{
AioContext *aio_context;
BlockBackend *blk;
BlockDriverState *bs;
if (has_id && has_node_name) {
error_setg(errp, "Only one of id and node-name must be specified");
return;
} else if (!has_id && !has_node_name) {
error_setg(errp, "No block device specified");
return;
}
if (has_id) {
blk = blk_by_name(id);
if (!blk) {
error_setg(errp, "Cannot find block backend %s", id);
return;
}
if (blk_get_refcnt(blk) > 1) {
error_setg(errp, "Block backend %s is in use", id);
return;
}
bs = blk_bs(blk);
aio_context = blk_get_aio_context(blk);
} else {
bs = bdrv_find_node(node_name);
if (!bs) {
error_setg(errp, "Cannot find node %s", node_name);
return;
}
blk = bs->blk;
if (blk) {
error_setg(errp, "Node %s is in use by %s",
node_name, blk_name(blk));
return;
}
aio_context = bdrv_get_aio_context(bs);
}
aio_context_acquire(aio_context);
if (bs) {
if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, errp)) {
goto out;
}
if (bs->refcnt > 1 || !QLIST_EMPTY(&bs->parents)) {
error_setg(errp, "Block device %s is in use",
bdrv_get_device_or_node_name(bs));
goto out;
}
}
if (blk) {
blk_unref(blk);
} else {
bdrv_unref(bs);
}
out:
aio_context_release(aio_context);
}
BlockJobInfoList *qmp_query_block_jobs(Error **errp)
{
BlockJobInfoList *head = NULL, **p_next = &head;