@@ -59,6 +59,9 @@ struct BlockBackend {
bool iostatus_enabled;
BlockDeviceIoStatus iostatus;
+ uint64_t perm;
+ uint64_t shared_perm;
+
bool allow_write_beyond_eof;
NotifierList remove_bs_notifiers, insert_bs_notifiers;
@@ -126,6 +129,8 @@ BlockBackend *blk_new(void)
blk = g_new0(BlockBackend, 1);
blk->refcnt = 1;
+ blk->perm = 0;
+ blk->shared_perm = BLK_PERM_ALL;
blk_set_enable_write_cache(blk, true);
qemu_co_queue_init(&blk->public.throttled_reqs[0]);
@@ -511,6 +516,27 @@ void blk_insert_bs(BlockBackend *blk, BlockDriverState *bs)
}
}
+/*
+ * Sets the permission bitmasks that the user of the BlockBackend needs.
+ */
+int blk_set_perm(BlockBackend *blk, uint64_t perm, uint64_t shared_perm,
+ Error **errp)
+{
+ int ret;
+
+ if (blk->root) {
+ ret = bdrv_child_try_set_perm(blk->root, perm, shared_perm, errp);
+ if (ret < 0) {
+ return ret;
+ }
+ }
+
+ blk->perm = perm;
+ blk->shared_perm = shared_perm;
+
+ return 0;
+}
+
static int blk_do_attach_dev(BlockBackend *blk, void *dev)
{
if (blk->dev) {
@@ -557,6 +583,7 @@ void blk_detach_dev(BlockBackend *blk, void *dev)
blk->dev_ops = NULL;
blk->dev_opaque = NULL;
blk->guest_block_size = 512;
+ blk_set_perm(blk, 0, BLK_PERM_ALL, &error_abort);
blk_unref(blk);
}
@@ -99,6 +99,8 @@ void blk_remove_bs(BlockBackend *blk);
void blk_insert_bs(BlockBackend *blk, BlockDriverState *bs);
bool bdrv_has_blk(BlockDriverState *bs);
bool bdrv_is_root_node(BlockDriverState *bs);
+int blk_set_perm(BlockBackend *blk, uint64_t perm, uint64_t shared_perm,
+ Error **errp);
void blk_set_allow_write_beyond_eof(BlockBackend *blk, bool allow);
void blk_iostatus_enable(BlockBackend *blk);
The BlockBackend can now store the permissions that its user requires. This is necessary because nodes can be ejected from or inserted into a BlockBackend and all of these operations must make sure that the user still gets what it requested initially. Signed-off-by: Kevin Wolf <kwolf@redhat.com> --- block/block-backend.c | 27 +++++++++++++++++++++++++++ include/sysemu/block-backend.h | 2 ++ 2 files changed, 29 insertions(+)