All the global state (GS) API functions will check that
qemu_in_main_thread() returns true. If not, it means
that the safety of BQL cannot be guaranteed, and
they need to be moved to I/O.
Signed-off-by: Emanuele Giuseppe Esposito <eespo...@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefa...@redhat.com>
---
block/block-backend.c | 90 +++++++++++++++++++++++++++++++++++++++++-
softmmu/qdev-monitor.c | 2 +
2 files changed, 91 insertions(+), 1 deletion(-)
diff --git a/block/block-backend.c b/block/block-backend.c
index 0afc03fd66..ed45576007 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -228,6 +228,7 @@ static void blk_root_activate(BdrvChild *child, Error
**errp)
void blk_set_force_allow_inactivate(BlockBackend *blk)
{
+ assert(qemu_in_main_thread());
blk->force_allow_inactivate = true;
}
@@ -346,6 +347,8 @@ BlockBackend *blk_new(AioContext *ctx, uint64_t perm,
uint64_t shared_perm)
{
BlockBackend *blk;
+ assert(qemu_in_main_thread());
+
blk = g_new0(BlockBackend, 1);
blk->refcnt = 1;
blk->ctx = ctx;
@@ -383,6 +386,8 @@ BlockBackend *blk_new_with_bs(BlockDriverState *bs,
uint64_t perm,
{
BlockBackend *blk = blk_new(bdrv_get_aio_context(bs), perm, shared_perm);
+ assert(qemu_in_main_thread());
+
if (blk_insert_bs(blk, bs, errp) < 0) {
blk_unref(blk);
return NULL;
@@ -411,6 +416,8 @@ BlockBackend *blk_new_open(const char *filename, const char
*reference,
uint64_t perm = 0;
uint64_t shared = BLK_PERM_ALL;
+ assert(qemu_in_main_thread());
+
/*
* blk_new_open() is mainly used in .bdrv_create implementations and the
* tools where sharing isn't a major concern because the BDS stays private
@@ -488,6 +495,7 @@ static void drive_info_del(DriveInfo *dinfo)
int blk_get_refcnt(BlockBackend *blk)
{
+ assert(qemu_in_main_thread());
return blk ? blk->refcnt : 0;
}
@@ -498,6 +506,7 @@ int blk_get_refcnt(BlockBackend *blk)
void blk_ref(BlockBackend *blk)
{
assert(blk->refcnt > 0);
+ assert(qemu_in_main_thread());
blk->refcnt++;
}
@@ -508,6 +517,7 @@ void blk_ref(BlockBackend *blk)
*/
void blk_unref(BlockBackend *blk)
{
+ assert(qemu_in_main_thread());
if (blk) {
assert(blk->refcnt > 0);
if (blk->refcnt > 1) {
@@ -528,6 +538,7 @@ void blk_unref(BlockBackend *blk)
*/
BlockBackend *blk_all_next(BlockBackend *blk)
{
+ assert(qemu_in_main_thread());
return blk ? QTAILQ_NEXT(blk, link)
: QTAILQ_FIRST(&block_backends);
}
@@ -536,6 +547,8 @@ void blk_remove_all_bs(void)
{
BlockBackend *blk = NULL;
+ assert(qemu_in_main_thread());
+
while ((blk = blk_all_next(blk)) != NULL) {
AioContext *ctx = blk_get_aio_context(blk);
@@ -559,6 +572,7 @@ void blk_remove_all_bs(void)
*/
BlockBackend *blk_next(BlockBackend *blk)
{
+ assert(qemu_in_main_thread());
return blk ? QTAILQ_NEXT(blk, monitor_link)
: QTAILQ_FIRST(&monitor_block_backends);
}
@@ -625,6 +639,7 @@ static void bdrv_next_reset(BdrvNextIterator *it)
BlockDriverState *bdrv_first(BdrvNextIterator *it)
{
+ assert(qemu_in_main_thread());
bdrv_next_reset(it);
return bdrv_next(it);
}
@@ -662,6 +677,7 @@ bool monitor_add_blk(BlockBackend *blk, const char *name,
Error **errp)
{
assert(!blk->name);
assert(name && name[0]);
+ assert(qemu_in_main_thread());
if (!id_wellformed(name)) {
error_setg(errp, "Invalid device name");
@@ -689,6 +705,8 @@ bool monitor_add_blk(BlockBackend *blk, const char *name,
Error **errp)
*/
void monitor_remove_blk(BlockBackend *blk)
{
+ assert(qemu_in_main_thread());
+
if (!blk->name) {
return;
}
@@ -704,6 +722,7 @@ void monitor_remove_blk(BlockBackend *blk)
*/
const char *blk_name(const BlockBackend *blk)
{
+ assert(qemu_in_main_thread());
return blk->name ?: "";
}
@@ -715,6 +734,7 @@ BlockBackend *blk_by_name(const char *name)
{
BlockBackend *blk = NULL;
+ assert(qemu_in_main_thread());
assert(name);
while ((blk = blk_next(blk)) != NULL) {
if (!strcmp(name, blk->name)) {
@@ -749,6 +769,7 @@ static BlockBackend *bdrv_first_blk(BlockDriverState *bs)
*/
bool bdrv_has_blk(BlockDriverState *bs)
{
+ assert(qemu_in_main_thread());
return bdrv_first_blk(bs) != NULL;
}
@@ -759,6 +780,7 @@ bool bdrv_is_root_node(BlockDriverState *bs)
{
BdrvChild *c;
+ assert(qemu_in_main_thread());
QLIST_FOREACH(c, &bs->parents, next_parent) {
if (c->klass != &child_root) {
return false;
@@ -808,6 +830,7 @@ BlockBackend *blk_by_legacy_dinfo(DriveInfo *dinfo)
*/
BlockBackendPublic *blk_get_public(BlockBackend *blk)
{
+ assert(qemu_in_main_thread());
return &blk->public;
}
@@ -816,6 +839,7 @@ BlockBackendPublic *blk_get_public(BlockBackend *blk)
*/
BlockBackend *blk_by_public(BlockBackendPublic *public)
{
+ assert(qemu_in_main_thread());
return container_of(public, BlockBackend, public);
}
@@ -828,6 +852,8 @@ void blk_remove_bs(BlockBackend *blk)
BlockDriverState *bs;
BdrvChild *root;
+ assert(qemu_in_main_thread());
+
notifier_list_notify(&blk->remove_bs_notifiers, blk);
if (tgm->throttle_state) {
bs = blk_bs(blk);
@@ -855,6 +881,7 @@ void blk_remove_bs(BlockBackend *blk)
int blk_insert_bs(BlockBackend *blk, BlockDriverState *bs, Error **errp)
{
ThrottleGroupMember *tgm = &blk->public.throttle_group_member;
+ assert(qemu_in_main_thread());
bdrv_ref(bs);
blk->root = bdrv_root_attach_child(bs, "root", &child_root,
BDRV_CHILD_FILTERED |
BDRV_CHILD_PRIMARY,
@@ -889,6 +916,7 @@ int blk_set_perm(BlockBackend *blk, uint64_t perm, uint64_t
shared_perm,
{
int ret;
+ assert(qemu_in_main_thread());
if (blk->root && !blk->disable_perm) {
ret = bdrv_child_try_set_perm(blk->root, perm, shared_perm, errp);
if (ret < 0) {
@@ -904,6 +932,7 @@ int blk_set_perm(BlockBackend *blk, uint64_t perm, uint64_t
shared_perm,
void blk_get_perm(BlockBackend *blk, uint64_t *perm, uint64_t *shared_perm)
{
+ assert(qemu_in_main_thread());
*perm = blk->perm;
*shared_perm = blk->shared_perm;
}
@@ -914,6 +943,7 @@ void blk_get_perm(BlockBackend *blk, uint64_t *perm,
uint64_t *shared_perm)
*/
int blk_attach_dev(BlockBackend *blk, DeviceState *dev)
{
+ assert(qemu_in_main_thread());
if (blk->dev) {
return -EBUSY;
}
@@ -939,6 +969,7 @@ int blk_attach_dev(BlockBackend *blk, DeviceState *dev)
void blk_detach_dev(BlockBackend *blk, DeviceState *dev)
{
assert(blk->dev == dev);
+ assert(qemu_in_main_thread());
blk->dev = NULL;
blk->dev_ops = NULL;
blk->dev_opaque = NULL;
@@ -952,6 +983,7 @@ void blk_detach_dev(BlockBackend *blk, DeviceState *dev)
*/
DeviceState *blk_get_attached_dev(BlockBackend *blk)
{
+ assert(qemu_in_main_thread());
return blk->dev;
}
@@ -960,6 +992,7 @@ DeviceState *blk_get_attached_dev(BlockBackend *blk)
char *blk_get_attached_dev_id(BlockBackend *blk)
{
DeviceState *dev = blk->dev;
+ assert(qemu_in_main_thread());
if (!dev) {
return g_strdup("");
@@ -980,6 +1013,8 @@ BlockBackend *blk_by_dev(void *dev)
{
BlockBackend *blk = NULL;
+ assert(qemu_in_main_thread());
+
assert(dev != NULL);
while ((blk = blk_all_next(blk)) != NULL) {
if (blk->dev == dev) {
@@ -997,6 +1032,7 @@ BlockBackend *blk_by_dev(void *dev)
void blk_set_dev_ops(BlockBackend *blk, const BlockDevOps *ops,
void *opaque)
{
+ assert(qemu_in_main_thread());
blk->dev_ops = ops;
blk->dev_opaque = opaque;
@@ -1018,6 +1054,7 @@ void blk_set_dev_ops(BlockBackend *blk, const BlockDevOps
*ops,
*/
void blk_dev_change_media_cb(BlockBackend *blk, bool load, Error **errp)
{
+ assert(qemu_in_main_thread());
if (blk->dev_ops && blk->dev_ops->change_media_cb) {
bool tray_was_open, tray_is_open;
Error *local_err = NULL;
@@ -1109,6 +1146,7 @@ static void blk_root_resize(BdrvChild *child)
void blk_iostatus_enable(BlockBackend *blk)
{
+ assert(qemu_in_main_thread());
blk->iostatus_enabled = true;
blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK;
}
@@ -1117,6 +1155,7 @@ void blk_iostatus_enable(BlockBackend *blk)
* enables it _and_ the VM is configured to stop on errors */
bool blk_iostatus_is_enabled(const BlockBackend *blk)
{
+ assert(qemu_in_main_thread());
return (blk->iostatus_enabled &&
(blk->on_write_error == BLOCKDEV_ON_ERROR_ENOSPC ||
blk->on_write_error == BLOCKDEV_ON_ERROR_STOP ||
@@ -1125,16 +1164,19 @@ bool blk_iostatus_is_enabled(const BlockBackend *blk)
BlockDeviceIoStatus blk_iostatus(const BlockBackend *blk)
{
+ assert(qemu_in_main_thread());
return blk->iostatus;
}
void blk_iostatus_disable(BlockBackend *blk)
{
+ assert(qemu_in_main_thread());
blk->iostatus_enabled = false;
}
void blk_iostatus_reset(BlockBackend *blk)
{
+ assert(qemu_in_main_thread());
if (blk_iostatus_is_enabled(blk)) {
blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK;
}
@@ -1142,6 +1184,7 @@ void blk_iostatus_reset(BlockBackend *blk)
void blk_iostatus_set_err(BlockBackend *blk, int error)
{
+ assert(qemu_in_main_thread());
assert(blk_iostatus_is_enabled(blk));
if (blk->iostatus == BLOCK_DEVICE_IO_STATUS_OK) {
blk->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE :
@@ -1341,6 +1384,7 @@ int blk_pwrite_zeroes(BlockBackend *blk, int64_t offset,
int blk_make_zero(BlockBackend *blk, BdrvRequestFlags flags)
{
+ assert(qemu_in_main_thread());
return bdrv_make_zero(blk->root, flags);
}
@@ -1369,6 +1413,7 @@ BlockAIOCB *blk_abort_aio_request(BlockBackend *blk,
void *opaque, int ret)
{
struct BlockBackendAIOCB *acb;
+ assert(qemu_in_main_thread());
blk_inc_in_flight(blk);
acb = blk_aio_get(&block_backend_aiocb_info, blk, cb, opaque);
@@ -1523,6 +1568,7 @@ void blk_get_geometry(BlockBackend *blk, uint64_t
*nb_sectors_ptr)
int64_t blk_nb_sectors(BlockBackend *blk)
{
+ assert(qemu_in_main_thread());
if (!blk_is_available(blk)) {
return -ENOMEDIUM;
}
@@ -1550,6 +1596,7 @@ BlockAIOCB *blk_aio_pwritev(BlockBackend *blk, int64_t
offset,
void blk_aio_cancel(BlockAIOCB *acb)
{
+ assert(qemu_in_main_thread());
bdrv_aio_cancel(acb);
}
@@ -1707,6 +1754,8 @@ void blk_drain(BlockBackend *blk)
{
BlockDriverState *bs = blk_bs(blk);
+ assert(qemu_in_main_thread());
+
if (bs) {
bdrv_drained_begin(bs);
}
@@ -1724,6 +1773,8 @@ void blk_drain_all(void)
{
BlockBackend *blk = NULL;
+ assert(qemu_in_main_thread());
+
bdrv_drain_all_begin();
while ((blk = blk_all_next(blk)) != NULL) {
@@ -1743,6 +1794,7 @@ void blk_drain_all(void)
void blk_set_on_error(BlockBackend *blk, BlockdevOnError on_read_error,
BlockdevOnError on_write_error)
{
+ assert(qemu_in_main_thread());
blk->on_read_error = on_read_error;
blk->on_write_error = on_write_error;
}
@@ -1826,6 +1878,7 @@ void blk_error_action(BlockBackend *blk, BlockErrorAction
action,
bool blk_supports_write_perm(BlockBackend *blk)
{
BlockDriverState *bs = blk_bs(blk);
+ assert(qemu_in_main_thread());
if (bs) {
return !bdrv_is_read_only(bs);
@@ -1846,6 +1899,7 @@ bool blk_is_writable(BlockBackend *blk)
bool blk_is_sg(BlockBackend *blk)
{
BlockDriverState *bs = blk_bs(blk);
+ assert(qemu_in_main_thread());
if (!bs) {
return false;
@@ -1856,17 +1910,20 @@ bool blk_is_sg(BlockBackend *blk)
bool blk_enable_write_cache(BlockBackend *blk)
{
+ assert(qemu_in_main_thread());
return blk->enable_write_cache;
}
void blk_set_enable_write_cache(BlockBackend *blk, bool wce)
{
+ assert(qemu_in_main_thread());
blk->enable_write_cache = wce;
}
void blk_invalidate_cache(BlockBackend *blk, Error **errp)
{
BlockDriverState *bs = blk_bs(blk);
+ assert(qemu_in_main_thread());
if (!bs) {
error_setg(errp, "Device '%s' has no medium", blk->name);
@@ -1879,7 +1936,6 @@ void blk_invalidate_cache(BlockBackend *blk, Error **errp)
bool blk_is_inserted(BlockBackend *blk)
{
BlockDriverState *bs = blk_bs(blk);
-
return bs && bdrv_is_inserted(bs);
}
@@ -1891,6 +1947,7 @@ bool blk_is_available(BlockBackend *blk)
void blk_lock_medium(BlockBackend *blk, bool locked)
{
BlockDriverState *bs = blk_bs(blk);
+ assert(qemu_in_main_thread());
if (bs) {
bdrv_lock_medium(bs, locked);
@@ -1900,6 +1957,8 @@ void blk_lock_medium(BlockBackend *blk, bool locked)
void blk_eject(BlockBackend *blk, bool eject_flag)
{
BlockDriverState *bs = blk_bs(blk);
+ assert(qemu_in_main_thread());
+
char *id;
if (bs) {
@@ -1917,6 +1976,7 @@ void blk_eject(BlockBackend *blk, bool eject_flag)
int blk_get_flags(BlockBackend *blk)
{
BlockDriverState *bs = blk_bs(blk);
+ assert(qemu_in_main_thread());
if (bs) {
return bdrv_get_flags(bs);
@@ -1970,6 +2030,7 @@ int blk_get_max_iov(BlockBackend *blk)
void blk_set_guest_block_size(BlockBackend *blk, int align)
{
+ assert(qemu_in_main_thread());
blk->guest_block_size = align;
}
@@ -1986,6 +2047,7 @@ void *blk_blockalign(BlockBackend *blk, size_t size)
bool blk_op_is_blocked(BlockBackend *blk, BlockOpType op, Error **errp)
{
BlockDriverState *bs = blk_bs(blk);
+ assert(qemu_in_main_thread());
if (!bs) {
return false;
@@ -1997,6 +2059,7 @@ bool blk_op_is_blocked(BlockBackend *blk, BlockOpType op,
Error **errp)
void blk_op_unblock(BlockBackend *blk, BlockOpType op, Error *reason)
{
BlockDriverState *bs = blk_bs(blk);
+ assert(qemu_in_main_thread());
if (bs) {
bdrv_op_unblock(bs, op, reason);
@@ -2006,6 +2069,7 @@ void blk_op_unblock(BlockBackend *blk, BlockOpType op,
Error *reason)
void blk_op_block_all(BlockBackend *blk, Error *reason)
{
BlockDriverState *bs = blk_bs(blk);
+ assert(qemu_in_main_thread());
if (bs) {
bdrv_op_block_all(bs, reason);
@@ -2015,6 +2079,7 @@ void blk_op_block_all(BlockBackend *blk, Error *reason)
void blk_op_unblock_all(BlockBackend *blk, Error *reason)
{
BlockDriverState *bs = blk_bs(blk);
+ assert(qemu_in_main_thread());
if (bs) {
bdrv_op_unblock_all(bs, reason);
@@ -2069,6 +2134,7 @@ static int blk_do_set_aio_context(BlockBackend *blk,
AioContext *new_context,
int blk_set_aio_context(BlockBackend *blk, AioContext *new_context,
Error **errp)
{
+ assert(qemu_in_main_thread());
return blk_do_set_aio_context(blk, new_context, true, errp);
}
@@ -2105,6 +2171,7 @@ void blk_add_aio_context_notifier(BlockBackend *blk,
{
BlockBackendAioNotifier *notifier;
BlockDriverState *bs = blk_bs(blk);
+ assert(qemu_in_main_thread());
notifier = g_new(BlockBackendAioNotifier, 1);
notifier->attached_aio_context = attached_aio_context;
@@ -2127,6 +2194,8 @@ void blk_remove_aio_context_notifier(BlockBackend *blk,
BlockBackendAioNotifier *notifier;
BlockDriverState *bs = blk_bs(blk);
+ assert(qemu_in_main_thread());
+
if (bs) {
bdrv_remove_aio_context_notifier(bs, attached_aio_context,
detach_aio_context, opaque);
@@ -2147,11 +2216,13 @@ void blk_remove_aio_context_notifier(BlockBackend *blk,
void blk_add_remove_bs_notifier(BlockBackend *blk, Notifier *notify)
{
+ assert(qemu_in_main_thread());
notifier_list_add(&blk->remove_bs_notifiers, notify);
}
void blk_add_insert_bs_notifier(BlockBackend *blk, Notifier *notify)
{
+ assert(qemu_in_main_thread());
notifier_list_add(&blk->insert_bs_notifiers, notify);
}
@@ -2214,6 +2285,7 @@ int blk_save_vmstate(BlockBackend *blk, const uint8_t
*buf,
int64_t pos, int size)
{
int ret;
+ assert(qemu_in_main_thread());
if (!blk_is_available(blk)) {
return -ENOMEDIUM;
@@ -2233,6 +2305,7 @@ int blk_save_vmstate(BlockBackend *blk, const uint8_t
*buf,
int blk_load_vmstate(BlockBackend *blk, uint8_t *buf, int64_t pos, int size)
{
+ assert(qemu_in_main_thread());
if (!blk_is_available(blk)) {
return -ENOMEDIUM;
}
@@ -2242,6 +2315,7 @@ int blk_load_vmstate(BlockBackend *blk, uint8_t *buf,
int64_t pos, int size)
int blk_probe_blocksizes(BlockBackend *blk, BlockSizes *bsz)
{
+ assert(qemu_in_main_thread());
if (!blk_is_available(blk)) {
return -ENOMEDIUM;
}
@@ -2251,6 +2325,7 @@ int blk_probe_blocksizes(BlockBackend *blk, BlockSizes
*bsz)
int blk_probe_geometry(BlockBackend *blk, HDGeometry *geo)
{
+ assert(qemu_in_main_thread());
if (!blk_is_available(blk)) {
return -ENOMEDIUM;
}
@@ -2264,6 +2339,7 @@ int blk_probe_geometry(BlockBackend *blk, HDGeometry *geo)
*/
void blk_update_root_state(BlockBackend *blk)
{
+ assert(qemu_in_main_thread());
assert(blk->root);
blk->root_state.open_flags = blk->root->bs->open_flags;
@@ -2276,6 +2352,7 @@ void blk_update_root_state(BlockBackend *blk)
*/
bool blk_get_detect_zeroes_from_root_state(BlockBackend *blk)
{
+ assert(qemu_in_main_thread());
return blk->root_state.detect_zeroes;
}
@@ -2285,17 +2362,20 @@ bool blk_get_detect_zeroes_from_root_state(BlockBackend
*blk)
*/
int blk_get_open_flags_from_root_state(BlockBackend *blk)
{
+ assert(qemu_in_main_thread());
return blk->root_state.open_flags;
}
BlockBackendRootState *blk_get_root_state(BlockBackend *blk)
{
+ assert(qemu_in_main_thread());
return &blk->root_state;
}
int blk_commit_all(void)
{
BlockBackend *blk = NULL;
+ assert(qemu_in_main_thread());
while ((blk = blk_all_next(blk)) != NULL) {
AioContext *aio_context = blk_get_aio_context(blk);
@@ -2320,6 +2400,7 @@ int blk_commit_all(void)
/* throttling disk I/O limits */
void blk_set_io_limits(BlockBackend *blk, ThrottleConfig *cfg)
{
+ assert(qemu_in_main_thread());
throttle_group_config(&blk->public.throttle_group_member, cfg);
}
@@ -2328,6 +2409,7 @@ void blk_io_limits_disable(BlockBackend *blk)
BlockDriverState *bs = blk_bs(blk);
ThrottleGroupMember *tgm = &blk->public.throttle_group_member;
assert(tgm->throttle_state);
+ assert(qemu_in_main_thread());
if (bs) {
bdrv_drained_begin(bs);
}
@@ -2341,12 +2423,14 @@ void blk_io_limits_disable(BlockBackend *blk)
void blk_io_limits_enable(BlockBackend *blk, const char *group)
{
assert(!blk->public.throttle_group_member.throttle_state);
+ assert(qemu_in_main_thread());
throttle_group_register_tgm(&blk->public.throttle_group_member,
group, blk_get_aio_context(blk));
}
void blk_io_limits_update_group(BlockBackend *blk, const char *group)
{
+ assert(qemu_in_main_thread());
/* this BB is not part of any group */
if (!blk->public.throttle_group_member.throttle_state) {
return;
@@ -2414,11 +2498,13 @@ static void blk_root_drained_end(BdrvChild *child, int
*drained_end_counter)
void blk_register_buf(BlockBackend *blk, void *host, size_t size)
{
+ assert(qemu_in_main_thread());
bdrv_register_buf(blk_bs(blk), host, size);
}
void blk_unregister_buf(BlockBackend *blk, void *host)
{
+ assert(qemu_in_main_thread());
bdrv_unregister_buf(blk_bs(blk), host);
}
@@ -2443,11 +2529,13 @@ int coroutine_fn blk_co_copy_range(BlockBackend
*blk_in, int64_t off_in,
const BdrvChild *blk_root(BlockBackend *blk)
{
+ assert(qemu_in_main_thread());
return blk->root;
}
int blk_make_empty(BlockBackend *blk, Error **errp)
{
+ assert(qemu_in_main_thread());
if (!blk_is_available(blk)) {
error_setg(errp, "No medium inserted");
return -ENOMEDIUM;
diff --git a/softmmu/qdev-monitor.c b/softmmu/qdev-monitor.c
index 4851de51a5..71cb6a549b 100644
--- a/softmmu/qdev-monitor.c
+++ b/softmmu/qdev-monitor.c
@@ -963,6 +963,8 @@ BlockBackend *blk_by_qdev_id(const char *id, Error **errp)
DeviceState *dev;
BlockBackend *blk;
+ assert(qemu_in_main_thread());
+
dev = find_device_state(id, errp);
if (dev == NULL) {
return NULL;
--
2.27.0
