block: Pass BdrvChildRole to bdrv_child_perm()

For now, all callers pass 0 and no callee evaluates this value.  Later
patches will change both.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20200513110544.176672-7-mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

1 files changed, 12 insertions, 10 deletions

diff --git a/block.c b/block.c
index 14810e0426..5d9a331f5b 100644
--- a/block.c
+++ b/block.c
@@ -1954,12 +1954,12 @@ bool bdrv_is_writable(BlockDriverState *bs)
 
 static void bdrv_child_perm(BlockDriverState *bs, BlockDriverState *child_bs,
                             BdrvChild *c, const BdrvChildClass *child_class,
-                            BlockReopenQueue *reopen_queue,
+                            BdrvChildRole role, BlockReopenQueue *reopen_queue,
                             uint64_t parent_perm, uint64_t parent_shared,
                             uint64_t *nperm, uint64_t *nshared)
 {
     assert(bs->drv && bs->drv->bdrv_child_perm);
-    bs->drv->bdrv_child_perm(bs, c, child_class, reopen_queue,
+    bs->drv->bdrv_child_perm(bs, c, child_class, role, reopen_queue,
                              parent_perm, parent_shared,
                              nperm, nshared);
     /* TODO Take force_share from reopen_queue */
@@ -2053,7 +2053,7 @@ static int bdrv_check_perm(BlockDriverState *bs, BlockReopenQueue *q,
         uint64_t cur_perm, cur_shared;
         bool child_tighten_restr;
 
-        bdrv_child_perm(bs, c->bs, c, c->klass, q,
+        bdrv_child_perm(bs, c->bs, c, c->klass, c->role, q,
                         cumulative_perms, cumulative_shared_perms,
                         &cur_perm, &cur_shared);
         ret = bdrv_child_check_perm(c, q, cur_perm, cur_shared, ignore_children,
@@ -2120,7 +2120,7 @@ static void bdrv_set_perm(BlockDriverState *bs, uint64_t cumulative_perms,
     /* Update all children */
     QLIST_FOREACH(c, &bs->children, next) {
         uint64_t cur_perm, cur_shared;
-        bdrv_child_perm(bs, c->bs, c, c->klass, NULL,
+        bdrv_child_perm(bs, c->bs, c, c->klass, c->role, NULL,
                         cumulative_perms, cumulative_shared_perms,
                         &cur_perm, &cur_shared);
         bdrv_child_set_perm(c, cur_perm, cur_shared);
@@ -2348,14 +2348,15 @@ int bdrv_child_refresh_perms(BlockDriverState *bs, BdrvChild *c, Error **errp)
     uint64_t perms, shared;
 
     bdrv_get_cumulative_perm(bs, &parent_perms, &parent_shared);
-    bdrv_child_perm(bs, c->bs, c, c->klass, NULL, parent_perms, parent_shared,
-                    &perms, &shared);
+    bdrv_child_perm(bs, c->bs, c, c->klass, c->role, NULL,
+                    parent_perms, parent_shared, &perms, &shared);
 
     return bdrv_child_try_set_perm(c, perms, shared, errp);
 }
 
 void bdrv_filter_default_perms(BlockDriverState *bs, BdrvChild *c,
                                const BdrvChildClass *child_class,
+                               BdrvChildRole role,
                                BlockReopenQueue *reopen_queue,
                                uint64_t perm, uint64_t shared,
                                uint64_t *nperm, uint64_t *nshared)
@@ -2366,6 +2367,7 @@ void bdrv_filter_default_perms(BlockDriverState *bs, BdrvChild *c,
 
 void bdrv_format_default_perms(BlockDriverState *bs, BdrvChild *c,
                                const BdrvChildClass *child_class,
+                               BdrvChildRole role,
                                BlockReopenQueue *reopen_queue,
                                uint64_t perm, uint64_t shared,
                                uint64_t *nperm, uint64_t *nshared)
@@ -2378,7 +2380,7 @@ void bdrv_format_default_perms(BlockDriverState *bs, BdrvChild *c,
 
         /* Apart from the modifications below, the same permissions are
          * forwarded and left alone as for filters */
-        bdrv_filter_default_perms(bs, c, child_class, reopen_queue,
+        bdrv_filter_default_perms(bs, c, child_class, role, reopen_queue,
                                   perm, shared, &perm, &shared);
 
         /* Format drivers may touch metadata even if the guest doesn't write */
@@ -2655,7 +2657,7 @@ BdrvChild *bdrv_attach_child(BlockDriverState *parent_bs,
     bdrv_get_cumulative_perm(parent_bs, &perm, &shared_perm);
 
     assert(parent_bs->drv);
-    bdrv_child_perm(parent_bs, child_bs, NULL, child_class, NULL,
+    bdrv_child_perm(parent_bs, child_bs, NULL, child_class, child_role, NULL,
                     perm, shared_perm, &perm, &shared_perm);
 
     child = bdrv_root_attach_child(child_bs, child_name, child_class,
@@ -3683,7 +3685,7 @@ int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp)
         if (state->replace_backing_bs && state->new_backing_bs) {
             uint64_t nperm, nshared;
             bdrv_child_perm(state->bs, state->new_backing_bs,
-                            NULL, &child_backing, bs_queue,
+                            NULL, &child_backing, 0, bs_queue,
                             state->perm, state->shared_perm,
                             &nperm, &nshared);
             ret = bdrv_check_update_perm(state->new_backing_bs, NULL,
@@ -3806,7 +3808,7 @@ static void bdrv_reopen_perm(BlockReopenQueue *q, BlockDriverState *bs,
         } else {
             uint64_t nperm, nshared;
 
-            bdrv_child_perm(parent->state.bs, bs, c, c->klass, q,
+            bdrv_child_perm(parent->state.bs, bs, c, c->klass, c->role, q,
                             parent->state.perm, parent->state.shared_perm,
                             &nperm, &nshared);