writeback: add wbc_to_write_flags()

Add wbc_to_write_flags(), which returns the write modifier flags to use,
based on a struct writeback_control. No functional changes in this
patch, but it prepares us for factoring other wbc fields for write type.

Signed-off-by: Jens Axboe <axboe@fb.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Christoph Hellwig <hch@lst.de>

1 files changed, 1 insertions, 4 deletions

diff --git a/mm/page_io.c b/mm/page_io.c
index a2651f58c86a..23f6d0d3470f 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -320,10 +320,7 @@ int __swap_writepage(struct page *page, struct writeback_control *wbc,
                 ret = -ENOMEM;
                 goto out;
         }
-        if (wbc->sync_mode == WB_SYNC_ALL)
-                bio_set_op_attrs(bio, REQ_OP_WRITE, REQ_SYNC);
-        else
-                bio_set_op_attrs(bio, REQ_OP_WRITE, 0);
+        bio->bi_opf = REQ_OP_WRITE | wbc_to_write_flags(wbc);
         count_vm_event(PSWPOUT);
         set_page_writeback(page);
         unlock_page(page);