block: Add bdrv_reopen_set_read_only()
Most callers of bdrv_reopen() only use it to switch a BlockDriverState
between read-only and read-write, so this patch adds a new function
that does just that.
We also want to get rid of the flags parameter in the bdrv_reopen()
API, so this function sets the "read-only" option and passes the
original flags (which will then be updated in bdrv_reopen_prepare()).
Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
diff --git a/block.c b/block.c
index 811239c..7178872 100644
--- a/block.c
+++ b/block.c
@@ -3146,6 +3146,23 @@
return ret;
}
+int bdrv_reopen_set_read_only(BlockDriverState *bs, bool read_only,
+ Error **errp)
+{
+ int ret;
+ BlockReopenQueue *queue;
+ QDict *opts = qdict_new();
+
+ qdict_put_bool(opts, BDRV_OPT_READ_ONLY, read_only);
+
+ bdrv_subtree_drained_begin(bs);
+ queue = bdrv_reopen_queue(NULL, bs, opts, bdrv_get_flags(bs));
+ ret = bdrv_reopen_multiple(bdrv_get_aio_context(bs), queue, errp);
+ bdrv_subtree_drained_end(bs);
+
+ return ret;
+}
+
static BlockReopenQueueEntry *find_parent_in_reopen_queue(BlockReopenQueue *q,
BdrvChild *c)
{
