X-Git-Url: https://git.kernel.dk/?a=blobdiff_plain;f=filesetup.c;h=51efdf768d3068b1ac6a895b03adfaa4678f54c6;hb=e7e136da9253290a96ccfbfae5cadaf109b59b3c;hp=cf8ae94c86b83c516411396b336f720e5ab03931;hpb=2378826d96532b390bd4cb08d3946b497a9b0e51;p=fio.git

diff --git a/filesetup.c b/filesetup.c
index cf8ae94c..51efdf76 100644
--- a/filesetup.c
+++ b/filesetup.c
@@ -267,11 +267,13 @@ error:
 static unsigned long long get_rand_file_size(struct thread_data *td)
 {
 	unsigned long long ret, sized;
+	uint64_t frand_max;
 	unsigned long r;
 
+	frand_max = rand_max(&td->file_size_state);
 	r = __rand(&td->file_size_state);
 	sized = td->o.file_size_high - td->o.file_size_low;
-	ret = (unsigned long long) ((double) sized * (r / (FRAND_MAX + 1.0)));
+	ret = (unsigned long long) ((double) sized * (r / (frand_max + 1.0)));
 	ret += td->o.file_size_low;
 	ret -= (ret % td->o.rw_min_bs);
 	return ret;
@@ -1065,6 +1067,16 @@ int init_random_map(struct thread_data *td)
 
 		blocks = fsize / (unsigned long long) td->o.rw_min_bs;
 
+		if (blocks > FRAND32_MAX &&
+		    td->o.random_generator == FIO_RAND_GEN_TAUSWORTHE &&
+		    !fio_option_is_set(&td->o, random_generator)) {
+			log_err("fio: file %s exceeds 32-bit tausworthe "
+				 "random generator. Use lfsr or "
+				 "tausworthe64.\n", f->file_name);
+			td_verror(td, EINVAL, "init file random");
+			return 1;
+		}
+
 		if (td->o.random_generator == FIO_RAND_GEN_LFSR) {
 			unsigned long seed;