[PATCH 5.6 115/254] io_uring: ensure openat sets O_LARGEFILE if needed

From: Jens Axboe axboe@kernel.dk

commit 08a1d26eb894a9dcf79f674558a284ad1ffef517 upstream.

OPENAT2 correctly sets O_LARGEFILE if it has to, but that escaped the OPENAT opcode. Dmitry reports that his test case that compares openat() and IORING_OP_OPENAT sees failures on large files:

--- fs/io_uring.c | 2 ++ 1 file changed, 2 insertions(+)

--- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -2571,6 +2571,8 @@ static int io_openat_prep(struct io_kioc req->open.how.mode = READ_ONCE(sqe->len); fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); req->open.how.flags = READ_ONCE(sqe->open_flags); + if (force_o_largefile()) + req->open.how.flags |= O_LARGEFILE;

req->open.filename = getname(fname); if (IS_ERR(req->open.filename)) {