Add blockalign/ba option
Allows the job to specify alignment of the IO specifically, instead
of relying on using blocksize as the offset alignment.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/init.c b/init.c
index 4ae3baf..80d098d 100644
--- a/init.c
+++ b/init.c
@@ -273,6 +273,21 @@
o->rw_min_bs = min(o->min_bs[DDIR_READ], o->min_bs[DDIR_WRITE]);
+ /*
+ * For random IO, allow blockalign offset other than min_bs.
+ */
+ if (!o->ba[DDIR_READ] || !td_random(td))
+ o->ba[DDIR_READ] = o->min_bs[DDIR_READ];
+ if (!o->ba[DDIR_WRITE] || !td_random(td))
+ o->ba[DDIR_WRITE] = o->min_bs[DDIR_WRITE];
+
+ if ((o->ba[DDIR_READ] != o->min_bs[DDIR_READ] ||
+ o->ba[DDIR_WRITE] != o->min_bs[DDIR_WRITE]) &&
+ !td->o.norandommap) {
+ log_err("fio: Any use of blockalign= turns off randommap\n");
+ td->o.norandommap = 1;
+ }
+
if (!o->file_size_high)
o->file_size_high = o->file_size_low;