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+static void quorum_set_supported_flags(BlockDriverState *bs) +{ + BDRVQuorumState *s = bs->opaque; + int i; + + bs->supported_write_flags = BDRV_REQ_FUA; + bs->supported_zero_flags = BDRV_REQ_FUA | BDRV_REQ_MAY_UNMAP; + + for (i = 0; i < s->num_children; i++) { + bs->supported_write_flags &= s->children[i]->bs->supported_write_flags; + bs->supported_zero_flags &= s->children[i]->bs->supported_zero_flags; + } +} + static int quorum_open(BlockDriverState *bs, QDict *options, int flags, Error **errp) { @@ -961,6 +975,8 @@ static int quorum_open(BlockDriverState *bs, QDict *options, int flags, } s->next_child_index = s->num_children; + quorum_set_supported_flags(bs); + g_free(opened); goto exit; @@ -1029,6 +1045,8 @@ static void quorum_add_child(BlockDriverState *bs, BlockDriverState *child_bs, s->children = g_renew(BdrvChild *, s->children, s->num_children + 1); s->children[s->num_children++] = child; + quorum_set_supported_flags(bs); + out: bdrv_drained_end(bs); } @@ -1064,6 +1082,8 @@ static void quorum_del_child(BlockDriverState *bs, BdrvChild *child, bdrv_unref_child(bs, child); bdrv_drained_end(bs); + + quorum_set_supported_flags(bs); } static void quorum_refresh_filename(BlockDriverState *bs, QDict *options)