block: Add reopen_queue to bdrv_child_perm()

In the context of bdrv_reopen(), we'll have to look at the state of the
graph as it will be after the reopen. This interface addition is in
preparation for the change.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>

1 files changed, 12 insertions, 7 deletions

diff --git a/block.c b/block.c
index 6dd47e414e..c7724c85e3 100644
--- a/block.c
+++ b/block.c
@@ -1537,16 +1537,17 @@ static void bdrv_child_abort_perm_update(BdrvChild *c);
 static void bdrv_child_set_perm(BdrvChild *c, uint64_t perm, uint64_t shared);
 
 static void bdrv_child_perm(BlockDriverState *bs, BlockDriverState *child_bs,
-                            BdrvChild *c,
-                            const BdrvChildRole *role,
+                            BdrvChild *c, const BdrvChildRole *role,
+                            BlockReopenQueue *reopen_queue,
                             uint64_t parent_perm, uint64_t parent_shared,
                             uint64_t *nperm, uint64_t *nshared)
 {
     if (bs->drv && bs->drv->bdrv_child_perm) {
-        bs->drv->bdrv_child_perm(bs, c, role,
+        bs->drv->bdrv_child_perm(bs, c, role, reopen_queue,
                                  parent_perm, parent_shared,
                                  nperm, nshared);
     }
+    /* TODO Take force_share from reopen_queue */
     if (child_bs && child_bs->force_share) {
         *nshared = BLK_PERM_ALL;
     }
@@ -1596,7 +1597,7 @@ static int bdrv_check_perm(BlockDriverState *bs, uint64_t cumulative_perms,
     /* Check all children */
     QLIST_FOREACH(c, &bs->children, next) {
         uint64_t cur_perm, cur_shared;
-        bdrv_child_perm(bs, c->bs, c, c->role,
+        bdrv_child_perm(bs, c->bs, c, c->role, NULL,
                         cumulative_perms, cumulative_shared_perms,
                         &cur_perm, &cur_shared);
         ret = bdrv_child_check_perm(c, cur_perm, cur_shared, ignore_children,
@@ -1658,7 +1659,7 @@ 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->role,
+        bdrv_child_perm(bs, c->bs, c, c->role, NULL,
                         cumulative_perms, cumulative_shared_perms,
                         &cur_perm, &cur_shared);
         bdrv_child_set_perm(c, cur_perm, cur_shared);
@@ -1827,6 +1828,7 @@ int bdrv_child_try_set_perm(BdrvChild *c, uint64_t perm, uint64_t shared,
 
 void bdrv_filter_default_perms(BlockDriverState *bs, BdrvChild *c,
                                const BdrvChildRole *role,
+                               BlockReopenQueue *reopen_queue,
                                uint64_t perm, uint64_t shared,
                                uint64_t *nperm, uint64_t *nshared)
 {
@@ -1844,6 +1846,7 @@ void bdrv_filter_default_perms(BlockDriverState *bs, BdrvChild *c,
 
 void bdrv_format_default_perms(BlockDriverState *bs, BdrvChild *c,
                                const BdrvChildRole *role,
+                               BlockReopenQueue *reopen_queue,
                                uint64_t perm, uint64_t shared,
                                uint64_t *nperm, uint64_t *nshared)
 {
@@ -1853,9 +1856,11 @@ void bdrv_format_default_perms(BlockDriverState *bs, BdrvChild *c,
     if (!backing) {
         /* Apart from the modifications below, the same permissions are
          * forwarded and left alone as for filters */
-        bdrv_filter_default_perms(bs, c, role, perm, shared, &perm, &shared);
+        bdrv_filter_default_perms(bs, c, role, reopen_queue, perm, shared,
+                                  &perm, &shared);
 
         /* Format drivers may touch metadata even if the guest doesn't write */
+        /* TODO Take flags from reopen_queue */
         if (bdrv_is_writable(bs)) {
             perm |= BLK_PERM_WRITE | BLK_PERM_RESIZE;
         }
@@ -1999,7 +2004,7 @@ BdrvChild *bdrv_attach_child(BlockDriverState *parent_bs,
 
     assert(parent_bs->drv);
     assert(bdrv_get_aio_context(parent_bs) == bdrv_get_aio_context(child_bs));
-    bdrv_child_perm(parent_bs, child_bs, NULL, child_role,
+    bdrv_child_perm(parent_bs, child_bs, NULL, child_role, NULL,
                     perm, shared_perm, &perm, &shared_perm);
 
     child = bdrv_root_attach_child(child_bs, child_name, child_role,