On 2/3/23 8:26?AM, Vincent Fu wrote: > diff --git a/engines/sg.c b/engines/sg.c > index 24783374..0bb5be4a 100644 > --- a/engines/sg.c > +++ b/engines/sg.c > @@ -1428,7 +1428,7 @@ static struct ioengine_ops ioengine = { > .open_file = fio_sgio_open, > .close_file = fio_sgio_close, > .get_file_size = fio_sgio_get_file_size, > - .flags = FIO_SYNCIO | FIO_RAWIO, > + .flags = FIO_SYNCIO | FIO_RAWIO | FIO_RO_NEEDS_RW_OPEN, > .options = options, > .option_struct_size = sizeof(struct sg_options) > }; > diff --git a/filesetup.c b/filesetup.c > index 1d3cc5ad..cb7047c5 100644 > --- a/filesetup.c > +++ b/filesetup.c > @@ -768,7 +768,7 @@ open_again: > else > from_hash = file_lookup_open(f, flags); > } else if (td_read(td)) { > - if (f->filetype == FIO_TYPE_CHAR && !read_only) > + if (td_ioengine_flagged(td, FIO_RO_NEEDS_RW_OPEN) && !read_only) > flags |= O_RDWR; > else > flags |= O_RDONLY; > diff --git a/ioengines.h b/ioengines.h > index d43540d0..2cb9743e 100644 > --- a/ioengines.h > +++ b/ioengines.h > @@ -89,6 +89,8 @@ enum fio_ioengine_flags { > = 1 << 16, /* async ioengine with commit function that sets issue_time */ > FIO_SKIPPABLE_IOMEM_ALLOC > = 1 << 17, /* skip iomem_alloc & iomem_free if job sets mem/iomem */ > + FIO_RO_NEEDS_RW_OPEN > + = 1 << 18, /* open files in rw mode even if we have a read job */ > }; > > /* Looks good to me. -- Jens Axboe