block: add bdrv_list_* permission update functions
Add new interface, allowing use of existing node list. It will be used
to fix bdrv_replace_node() in the further commit.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20210428151804.439460-16-vsementsov@virtuozzo.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
diff --git a/block.c b/block.c
index ab7a4d1..98b7bc1 100644
--- a/block.c
+++ b/block.c
@@ -2249,7 +2249,8 @@
static int bdrv_node_check_perm(BlockDriverState *bs, BlockReopenQueue *q,
uint64_t cumulative_perms,
uint64_t cumulative_shared_perms,
- GSList *ignore_children, Error **errp)
+ GSList *ignore_children,
+ Transaction *tran, Error **errp)
{
BlockDriver *drv = bs->drv;
BdrvChild *c;
@@ -2297,7 +2298,7 @@
return 0;
}
- ret = bdrv_drv_set_perm(bs, cumulative_perms, cumulative_shared_perms, NULL,
+ ret = bdrv_drv_set_perm(bs, cumulative_perms, cumulative_shared_perms, tran,
errp);
if (ret < 0) {
return ret;
@@ -2316,7 +2317,56 @@
bdrv_child_perm(bs, c->bs, c, c->role, q,
cumulative_perms, cumulative_shared_perms,
&cur_perm, &cur_shared);
- bdrv_child_set_perm_safe(c, cur_perm, cur_shared, NULL);
+ bdrv_child_set_perm_safe(c, cur_perm, cur_shared, tran);
+ }
+
+ return 0;
+}
+
+/*
+ * If use_cumulative_perms is true, use cumulative_perms and
+ * cumulative_shared_perms for first element of the list. Otherwise just refresh
+ * all permissions.
+ */
+static int bdrv_check_perm_common(GSList *list, BlockReopenQueue *q,
+ bool use_cumulative_perms,
+ uint64_t cumulative_perms,
+ uint64_t cumulative_shared_perms,
+ GSList *ignore_children,
+ Transaction *tran, Error **errp)
+{
+ int ret;
+ BlockDriverState *bs;
+
+ if (use_cumulative_perms) {
+ bs = list->data;
+
+ ret = bdrv_node_check_perm(bs, q, cumulative_perms,
+ cumulative_shared_perms,
+ ignore_children, tran, errp);
+ if (ret < 0) {
+ return ret;
+ }
+
+ list = list->next;
+ }
+
+ for ( ; list; list = list->next) {
+ bs = list->data;
+
+ if (bdrv_parent_perms_conflict(bs, ignore_children, errp)) {
+ return -EINVAL;
+ }
+
+ bdrv_get_cumulative_perm(bs, &cumulative_perms,
+ &cumulative_shared_perms);
+
+ ret = bdrv_node_check_perm(bs, q, cumulative_perms,
+ cumulative_shared_perms,
+ ignore_children, tran, errp);
+ if (ret < 0) {
+ return ret;
+ }
}
return 0;
@@ -2327,31 +2377,16 @@
uint64_t cumulative_shared_perms,
GSList *ignore_children, Error **errp)
{
- int ret;
- BlockDriverState *root = bs;
- g_autoptr(GSList) list = bdrv_topological_dfs(NULL, NULL, root);
+ g_autoptr(GSList) list = bdrv_topological_dfs(NULL, NULL, bs);
+ return bdrv_check_perm_common(list, q, true, cumulative_perms,
+ cumulative_shared_perms, ignore_children,
+ NULL, errp);
+}
- for ( ; list; list = list->next) {
- bs = list->data;
-
- if (bs != root) {
- if (bdrv_parent_perms_conflict(bs, ignore_children, errp)) {
- return -EINVAL;
- }
-
- bdrv_get_cumulative_perm(bs, &cumulative_perms,
- &cumulative_shared_perms);
- }
-
- ret = bdrv_node_check_perm(bs, q, cumulative_perms,
- cumulative_shared_perms,
- ignore_children, errp);
- if (ret < 0) {
- return ret;
- }
- }
-
- return 0;
+static int bdrv_list_refresh_perms(GSList *list, BlockReopenQueue *q,
+ Transaction *tran, Error **errp)
+{
+ return bdrv_check_perm_common(list, q, false, 0, 0, NULL, tran, errp);
}
/*
@@ -2375,15 +2410,19 @@
}
}
-static void bdrv_abort_perm_update(BlockDriverState *bs)
+static void bdrv_list_abort_perm_update(GSList *list)
{
- g_autoptr(GSList) list = bdrv_topological_dfs(NULL, NULL, bs);
-
for ( ; list; list = list->next) {
bdrv_node_abort_perm_update((BlockDriverState *)list->data);
}
}
+static void bdrv_abort_perm_update(BlockDriverState *bs)
+{
+ g_autoptr(GSList) list = bdrv_topological_dfs(NULL, NULL, bs);
+ return bdrv_list_abort_perm_update(list);
+}
+
static void bdrv_node_set_perm(BlockDriverState *bs)
{
BlockDriver *drv = bs->drv;
@@ -2407,15 +2446,19 @@
}
}
-static void bdrv_set_perm(BlockDriverState *bs)
+static void bdrv_list_set_perm(GSList *list)
{
- g_autoptr(GSList) list = bdrv_topological_dfs(NULL, NULL, bs);
-
for ( ; list; list = list->next) {
bdrv_node_set_perm((BlockDriverState *)list->data);
}
}
+static void bdrv_set_perm(BlockDriverState *bs)
+{
+ g_autoptr(GSList) list = bdrv_topological_dfs(NULL, NULL, bs);
+ return bdrv_list_set_perm(list);
+}
+
void bdrv_get_cumulative_perm(BlockDriverState *bs, uint64_t *perm,
uint64_t *shared_perm)
{
@@ -2523,20 +2566,13 @@
static int bdrv_refresh_perms(BlockDriverState *bs, Error **errp)
{
int ret;
- uint64_t perm, shared_perm;
+ Transaction *tran = tran_new();
+ g_autoptr(GSList) list = bdrv_topological_dfs(NULL, NULL, bs);
- if (bdrv_parent_perms_conflict(bs, NULL, errp)) {
- return -EPERM;
- }
- bdrv_get_cumulative_perm(bs, &perm, &shared_perm);
- ret = bdrv_check_perm(bs, NULL, perm, shared_perm, NULL, errp);
- if (ret < 0) {
- bdrv_abort_perm_update(bs);
- return ret;
- }
- bdrv_set_perm(bs);
+ ret = bdrv_list_refresh_perms(list, NULL, tran, errp);
+ tran_finalize(tran, ret);
- return 0;
+ return ret;
}
int bdrv_child_try_set_perm(BdrvChild *c, uint64_t perm, uint64_t shared,
