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s->has_fallocate = true; + bs->supported_zero_flags = BDRV_REQ_ALLOCATE; } } else { if (!(S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) { @@ -646,10 +647,11 @@ static int raw_open_common(BlockDriverState *bs, QDict *options, #ifdef CONFIG_XFS if (platform_test_xfs_fd(s->fd)) { s->is_xfs = true; + bs->supported_zero_flags = BDRV_REQ_ALLOCATE; } #endif - bs->supported_zero_flags = BDRV_REQ_MAY_UNMAP; + bs->supported_zero_flags |= BDRV_REQ_MAY_UNMAP; ret = 0; fail: if (filename && (bdrv_flags & BDRV_O_TEMPORARY)) { @@ -1520,6 +1522,10 @@ static ssize_t handle_aiocb_write_zeroes(RawPosixAIOData *aiocb) } s->has_fallocate = false; } + + if (!s->has_fallocate) { + aiocb->bs->supported_zero_flags &= ~BDRV_REQ_ALLOCATE; + } #endif return -ENOTSUP;