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blockdev: Keep track of monitor-owned BDS

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As a side effect, we can now make x-blockdev-del's check whether a BDS
is actually owned by the monitor explicit.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Max Reitz 2016-01-29 16:36:12 +01:00
parent 2c1d04e002
commit 9c4218e957
4 changed files with 37 additions and 1 deletions
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28
blockdev.c
View file

@ -50,6 +50,9 @@
#include "trace.h"
#include "sysemu/arch_init.h"
static QTAILQ_HEAD(, BlockDriverState) monitor_bdrv_states =
QTAILQ_HEAD_INITIALIZER(monitor_bdrv_states);
static const char *const if_name[IF_COUNT] = {
[IF_NONE] = "none",
[IF_IDE] = "ide",
@ -702,6 +705,19 @@ fail:
return NULL;
}
void blockdev_close_all_bdrv_states(void)
{
BlockDriverState *bs, *next_bs;
QTAILQ_FOREACH_SAFE(bs, &monitor_bdrv_states, monitor_list, next_bs) {
AioContext *ctx = bdrv_get_aio_context(bs);
aio_context_acquire(ctx);
bdrv_unref(bs);
aio_context_release(ctx);
}
}
static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to,
Error **errp)
{
@ -3875,12 +3891,15 @@ void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
if (!bs) {
goto fail;
}
QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list);
}
if (bs && bdrv_key_required(bs)) {
if (blk) {
blk_unref(blk);
} else {
QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list);
bdrv_unref(bs);
}
error_setg(errp, "blockdev-add doesn't support encrypted devices");
@ -3940,7 +3959,13 @@ void qmp_x_blockdev_del(bool has_id, const char *id,
goto out;
}
if (bs->refcnt > 1 || !QLIST_EMPTY(&bs->parents)) {
if (!blk && !bs->monitor_list.tqe_prev) {
error_setg(errp, "Node %s is not owned by the monitor",
bs->node_name);
goto out;
}
if (bs->refcnt > 1) {
error_setg(errp, "Block device %s is in use",
bdrv_get_device_or_node_name(bs));
goto out;
@ -3950,6 +3975,7 @@ void qmp_x_blockdev_del(bool has_id, const char *id,
if (blk) {
blk_unref(blk);
} else {
QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list);
bdrv_unref(bs);
}