- if (td->odirect && io_u->ddir != DDIR_SYNC) {
- if (msync(f->mmap + real_off, io_u->xfer_buflen, MS_SYNC) < 0)
+ if (td->o.odirect && io_u->ddir != DDIR_SYNC) {
+ size_t len = (io_u->xfer_buflen + page_size - 1) & ~page_mask;
+ unsigned long long off = real_off & ~page_mask;
+
+ if (msync(f->mmap + off, len, MS_SYNC) < 0) {