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hmp: Allow using qdev ID for qemu-io command 

In order to issue requests on an existing BlockBackend with the
'qemu-io' HMP command, allow specifying the BlockBackend not only with a
BlockBackend name, but also with a qdev ID/QOM path for a device that
owns the (possibly anonymous) BlockBackend.

Because qdev names could be conflicting with BlockBackend and node
names, introduce a -d option to explicitly address a device. If the
option is not given, a BlockBackend or a node is addressed.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2019-12-17 15:13:34 +01:00
parent 7bb4941ace
commit 89b6fc4561
2 changed files with 23 additions and 13 deletions
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8
hmp-commands.hx
View File

@ -1875,9 +1875,11 @@ ETEXI
{
.name = "qemu-io",
.args_type = "device:B,command:s",
.params = "[device] \"[command]\"",
.help = "run a qemu-io command on a block device",
.args_type = "qdev:-d,device:B,command:s",
.params = "[-d] [device] \"[command]\"",
.help = "run a qemu-io command on a block device\n\t\t\t"
"-d: [device] is a device ID rather than a "
"drive ID or node name",
.cmd = hmp_qemu_io,
},

28
monitor/hmp-cmds.c
View File

@ -2468,23 +2468,31 @@ void hmp_qemu_io(Monitor *mon, const QDict *qdict)
{
BlockBackend *blk;
BlockBackend *local_blk = NULL;
bool qdev = qdict_get_try_bool(qdict, "qdev", false);
const char* device = qdict_get_str(qdict, "device");
const char* command = qdict_get_str(qdict, "command");
Error *err = NULL;
int ret;
blk = blk_by_name(device);
if (!blk) {
BlockDriverState *bs = bdrv_lookup_bs(NULL, device, &err);
if (bs) {
blk = local_blk = blk_new(bdrv_get_aio_context(bs),
0, BLK_PERM_ALL);
ret = blk_insert_bs(blk, bs, &err);
if (ret < 0) {
if (qdev) {
blk = blk_by_qdev_id(device, &err);
if (!blk) {
goto fail;
}
} else {
blk = blk_by_name(device);
if (!blk) {
BlockDriverState *bs = bdrv_lookup_bs(NULL, device, &err);
if (bs) {
blk = local_blk = blk_new(bdrv_get_aio_context(bs),
0, BLK_PERM_ALL);
ret = blk_insert_bs(blk, bs, &err);
if (ret < 0) {
goto fail;
}
} else {
goto fail;
}
} else {
goto fail;
}
}