X-Git-Url: https://git.kernel.dk/?a=blobdiff_plain;f=engines%2Fmmap.c;h=79238b1e537b079a183f31f589aa151b0d681419;hb=cf451d1ede3bbbd2fed3619eb43def054d5b5a5a;hp=059bfcfae7453d6dd804cf25ab6ad6ecfdc05411;hpb=d9a7ba88af39b1047c9f8c077280932cd12cb58e;p=fio.git

diff --git a/engines/mmap.c b/engines/mmap.c
index 059bfcfa..79238b1e 100644
--- a/engines/mmap.c
+++ b/engines/mmap.c
@@ -181,8 +181,16 @@ static int fio_mmapio_queue(struct thread_data *td, struct io_u *io_u)
 
 static int fio_mmapio_init(struct thread_data *td)
 {
+	struct thread_options *o = &td->o;
 	unsigned long shift, mask;
 
+	if ((td->o.rw_min_bs & page_mask) &&
+	    (o->odirect || o->fsync_blocks || o->fdatasync_blocks)) {
+		log_err("fio: mmap options dictate a minimum block size of "
+			"%lu bytes\n", page_size);
+		return 1;
+	}
+
 	mmap_map_size = MMAP_TOTAL_SZ / td->o.nr_files;
 	mask = mmap_map_size;
 	shift = 0;