@@ -226,12 +226,14 @@ void no_coroutine_fn bdrv_unref(BlockDriverState *bs);
void coroutine_fn no_co_wrapper bdrv_co_unref(BlockDriverState *bs);
void GRAPH_WRLOCK bdrv_schedule_unref(BlockDriverState *bs);
void bdrv_unref_child(BlockDriverState *parent, BdrvChild *child);
-BdrvChild *bdrv_attach_child(BlockDriverState *parent_bs,
- BlockDriverState *child_bs,
- const char *child_name,
- const BdrvChildClass *child_class,
- BdrvChildRole child_role,
- Error **errp);
+
+BdrvChild * GRAPH_WRLOCK
+bdrv_attach_child(BlockDriverState *parent_bs,
+ BlockDriverState *child_bs,
+ const char *child_name,
+ const BdrvChildClass *child_class,
+ BdrvChildRole child_role,
+ Error **errp);
bool bdrv_op_is_blocked(BlockDriverState *bs, BlockOpType op, Error **errp);
void bdrv_op_block(BlockDriverState *bs, BlockOpType op, Error *reason);
@@ -3217,8 +3217,6 @@ BdrvChild *bdrv_attach_child(BlockDriverState *parent_bs,
GLOBAL_STATE_CODE();
- bdrv_graph_wrlock(child_bs);
-
child = bdrv_attach_child_noperm(parent_bs, child_bs, child_name,
child_class, child_role, tran, errp);
if (!child) {
@@ -3233,9 +3231,8 @@ BdrvChild *bdrv_attach_child(BlockDriverState *parent_bs,
out:
tran_finalize(tran, ret);
- bdrv_graph_wrunlock();
- bdrv_unref(child_bs);
+ bdrv_schedule_unref(child_bs);
return ret < 0 ? NULL : child;
}
@@ -3756,11 +3753,13 @@ BdrvChild *bdrv_open_child(const char *filename,
return NULL;
}
+ bdrv_graph_wrlock(NULL);
ctx = bdrv_get_aio_context(bs);
aio_context_acquire(ctx);
child = bdrv_attach_child(parent, bs, bdref_key, child_class, child_role,
errp);
aio_context_release(ctx);
+ bdrv_graph_wrunlock();
return child;
}
@@ -1094,8 +1094,10 @@ static void quorum_add_child(BlockDriverState *bs, BlockDriverState *child_bs,
/* We can safely add the child now */
bdrv_ref(child_bs);
+ bdrv_graph_wrlock(child_bs);
child = bdrv_attach_child(bs, child_bs, indexstr, &child_of_bds,
BDRV_CHILD_DATA, errp);
+ bdrv_graph_wrunlock();
if (child == NULL) {
s->next_child_index--;
goto out;
@@ -542,12 +542,15 @@ static void replication_start(ReplicationState *rs, ReplicationMode mode,
return;
}
+ bdrv_graph_wrlock(bs);
+
bdrv_ref(hidden_disk->bs);
s->hidden_disk = bdrv_attach_child(bs, hidden_disk->bs, "hidden disk",
&child_of_bds, BDRV_CHILD_DATA,
&local_err);
if (local_err) {
error_propagate(errp, local_err);
+ bdrv_graph_wrunlock();
aio_context_release(aio_context);
return;
}
@@ -558,10 +561,13 @@ static void replication_start(ReplicationState *rs, ReplicationMode mode,
BDRV_CHILD_DATA, &local_err);
if (local_err) {
error_propagate(errp, local_err);
+ bdrv_graph_wrunlock();
aio_context_release(aio_context);
return;
}
+ bdrv_graph_wrunlock();
+
/* start backup job now */
error_setg(&s->blocker,
"Block device is in use by internal backup job");
@@ -1055,8 +1055,10 @@ static void do_test_delete_by_drain(bool detach_instead_of_delete,
null_bs = bdrv_open("null-co://", NULL, NULL, BDRV_O_RDWR | BDRV_O_PROTOCOL,
&error_abort);
+ bdrv_graph_wrlock(NULL);
bdrv_attach_child(bs, null_bs, "null-child", &child_of_bds,
BDRV_CHILD_DATA, &error_abort);
+ bdrv_graph_wrunlock();
/* This child will be the one to pass to requests through to, and
* it will stall until a drain occurs */
@@ -1064,17 +1066,21 @@ static void do_test_delete_by_drain(bool detach_instead_of_delete,
&error_abort);
child_bs->total_sectors = 65536 >> BDRV_SECTOR_BITS;
/* Takes our reference to child_bs */
+ bdrv_graph_wrlock(NULL);
tts->wait_child = bdrv_attach_child(bs, child_bs, "wait-child",
&child_of_bds,
BDRV_CHILD_DATA | BDRV_CHILD_PRIMARY,
&error_abort);
+ bdrv_graph_wrunlock();
/* This child is just there to be deleted
* (for detach_instead_of_delete == true) */
null_bs = bdrv_open("null-co://", NULL, NULL, BDRV_O_RDWR | BDRV_O_PROTOCOL,
&error_abort);
+ bdrv_graph_wrlock(NULL);
bdrv_attach_child(bs, null_bs, "null-child", &child_of_bds, BDRV_CHILD_DATA,
&error_abort);
+ bdrv_graph_wrunlock();
blk = blk_new(qemu_get_aio_context(), BLK_PERM_ALL, BLK_PERM_ALL);
blk_insert_bs(blk, bs, &error_abort);
@@ -1159,9 +1165,11 @@ static void detach_indirect_bh(void *opaque)
bdrv_unref_child(data->parent_b, data->child_b);
bdrv_ref(data->c);
+ bdrv_graph_wrlock(NULL);
data->child_c = bdrv_attach_child(data->parent_b, data->c, "PB-C",
&child_of_bds, BDRV_CHILD_DATA,
&error_abort);
+ bdrv_graph_wrunlock();
}
static void detach_by_parent_aio_cb(void *opaque, int ret)
@@ -1258,6 +1266,7 @@ static void test_detach_indirect(bool by_parent_cb)
/* Set child relationships */
bdrv_ref(b);
bdrv_ref(a);
+ bdrv_graph_wrlock(NULL);
child_b = bdrv_attach_child(parent_b, b, "PB-B", &child_of_bds,
BDRV_CHILD_DATA, &error_abort);
child_a = bdrv_attach_child(parent_b, a, "PB-A", &child_of_bds,
@@ -1267,6 +1276,7 @@ static void test_detach_indirect(bool by_parent_cb)
bdrv_attach_child(parent_a, a, "PA-A",
by_parent_cb ? &child_of_bds : &detach_by_driver_cb_class,
BDRV_CHILD_DATA, &error_abort);
+ bdrv_graph_wrunlock();
g_assert_cmpint(parent_a->refcnt, ==, 1);
g_assert_cmpint(parent_b->refcnt, ==, 1);
@@ -1685,6 +1695,7 @@ static void test_drop_intermediate_poll(void)
* Establish the chain last, so the chain links are the first
* elements in the BDS.parents lists
*/
+ bdrv_graph_wrlock(NULL);
for (i = 0; i < 3; i++) {
if (i) {
/* Takes the reference to chain[i - 1] */
@@ -1692,6 +1703,7 @@ static void test_drop_intermediate_poll(void)
&chain_child_class, BDRV_CHILD_COW, &error_abort);
}
}
+ bdrv_graph_wrunlock();
job = block_job_create("job", &test_simple_job_driver, NULL, job_node,
0, BLK_PERM_ALL, 0, 0, NULL, NULL, &error_abort);
@@ -1936,8 +1948,10 @@ static void do_test_replace_child_mid_drain(int old_drain_count,
new_child_bs->total_sectors = 1;
bdrv_ref(old_child_bs);
+ bdrv_graph_wrlock(NULL);
bdrv_attach_child(parent_bs, old_child_bs, "child", &child_of_bds,
BDRV_CHILD_COW, &error_abort);
+ bdrv_graph_wrunlock();
parent_s->setup_completed = true;
for (i = 0; i < old_drain_count; i++) {
@@ -137,8 +137,10 @@ static void test_update_perm_tree(void)
blk_insert_bs(root, bs, &error_abort);
+ bdrv_graph_wrlock(NULL);
bdrv_attach_child(filter, bs, "child", &child_of_bds,
BDRV_CHILD_DATA, &error_abort);
+ bdrv_graph_wrunlock();
aio_context_acquire(qemu_get_aio_context());
ret = bdrv_append(filter, bs, NULL);
@@ -205,8 +207,10 @@ static void test_should_update_child(void)
bdrv_set_backing_hd(target, bs, &error_abort);
g_assert(target->backing->bs == bs);
+ bdrv_graph_wrlock(NULL);
bdrv_attach_child(filter, target, "target", &child_of_bds,
BDRV_CHILD_DATA, &error_abort);
+ bdrv_graph_wrunlock();
aio_context_acquire(qemu_get_aio_context());
bdrv_append(filter, bs, &error_abort);
aio_context_release(qemu_get_aio_context());
@@ -236,6 +240,7 @@ static void test_parallel_exclusive_write(void)
*/
bdrv_ref(base);
+ bdrv_graph_wrlock(NULL);
bdrv_attach_child(top, fl1, "backing", &child_of_bds,
BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY,
&error_abort);
@@ -245,6 +250,7 @@ static void test_parallel_exclusive_write(void)
bdrv_attach_child(fl2, base, "backing", &child_of_bds,
BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY,
&error_abort);
+ bdrv_graph_wrunlock();
bdrv_replace_node(fl1, fl2, &error_abort);
@@ -349,6 +355,7 @@ static void test_parallel_perm_update(void)
*/
bdrv_ref(base);
+ bdrv_graph_wrlock(NULL);
bdrv_attach_child(top, ws, "file", &child_of_bds, BDRV_CHILD_DATA,
&error_abort);
c_fl1 = bdrv_attach_child(ws, fl1, "first", &child_of_bds,
@@ -361,6 +368,7 @@ static void test_parallel_perm_update(void)
bdrv_attach_child(fl2, base, "backing", &child_of_bds,
BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY,
&error_abort);
+ bdrv_graph_wrunlock();
/* Select fl1 as first child to be active */
s->selected = c_fl1;
@@ -410,9 +418,11 @@ static void test_append_greedy_filter(void)
BlockDriverState *base = no_perm_node("base");
BlockDriverState *fl = exclusive_writer_node("fl1");
+ bdrv_graph_wrlock(NULL);
bdrv_attach_child(top, base, "backing", &child_of_bds,
BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY,
&error_abort);
+ bdrv_graph_wrunlock();
aio_context_acquire(qemu_get_aio_context());
bdrv_append(fl, base, &error_abort);
Instead of taking the writer lock internally, require callers to already hold it when calling bdrv_attach_child_common(). These callers will typically already hold the graph lock once the locking work is completed, which means that they can't call functions that take it internally. Signed-off-by: Kevin Wolf <kwolf@redhat.com> --- include/block/block-global-state.h | 14 ++++++++------ block.c | 7 +++---- block/quorum.c | 2 ++ block/replication.c | 6 ++++++ tests/unit/test-bdrv-drain.c | 14 ++++++++++++++ tests/unit/test-bdrv-graph-mod.c | 10 ++++++++++ 6 files changed, 43 insertions(+), 10 deletions(-)