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block: Mark bdrv_attach_child() GRAPH_WRLOCK

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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>
Reviewed-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-ID: <20230911094620.45040-13-kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2023-09-11 11:46:11 +02:00
parent 5661a00d40
commit afdaeb9ea0
6 changed files with 43 additions and 10 deletions
Download patch file Download diff file Expand all files Collapse all files

14
tests/unit/test-bdrv-drain.c
View file

@ -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++) {

10
tests/unit/test-bdrv-graph-mod.c
View file

@ -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);