Commit c5de16cc authored Nov 26, 2018 by Kirill Tkhai Committed by Miklos Szeredi Feb 13, 2019

fuse: Replace page without copying in fuse_writepage_in_flight()



It looks like we can optimize page replacement and avoid copying by simple
updating the request's page.

[SzM: swap with new request's tmp page to avoid use after free.]

Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

parent e2653bd5

fs/fuse/file.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -1789,7 +1789,7 @@ static bool fuse_writepage_in_flight(struct fuse_req *new_req,
		if (curr_index == page->index) {
		WARN_ON(tmp->num_pages != 1);
		WARN_ON(!test_bit(FR_PENDING, &tmp->flags));
		copy_highpage(tmp->pages[0], page);
		swap(tmp->pages[0], new_req->pages[0]);
		break;
		}
		}

Admin message