Add IORING_OP_TEE implementing tee(2) support. Almost identical to splice bits, but without offsets.
Signed-off-by: Pavel Begunkov <[email protected]> --- fs/io_uring.c | 64 +++++++++++++++++++++++++++++++++-- include/uapi/linux/io_uring.h | 1 + 2 files changed, 62 insertions(+), 3 deletions(-) diff --git a/fs/io_uring.c b/fs/io_uring.c index 4ed82d39540b..dc314f66fbc9 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -855,6 +855,11 @@ static const struct io_op_def io_op_defs[] = { }, [IORING_OP_PROVIDE_BUFFERS] = {}, [IORING_OP_REMOVE_BUFFERS] = {}, + [IORING_OP_TEE] = { + .needs_file = 1, + .hash_reg_file = 1, + .unbound_nonreg_file = 1, + }, }; static void io_wq_submit_work(struct io_wq_work **workptr); @@ -2754,7 +2759,8 @@ static int io_write(struct io_kiocb *req, bool force_nonblock) return ret; } -static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) +static int __io_splice_prep(struct io_kiocb *req, + const struct io_uring_sqe *sqe) { struct io_splice* sp = &req->splice; unsigned int valid_flags = SPLICE_F_FD_IN_FIXED | SPLICE_F_ALL; @@ -2764,8 +2770,6 @@ static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) return 0; sp->file_in = NULL; - sp->off_in = READ_ONCE(sqe->splice_off_in); - sp->off_out = READ_ONCE(sqe->off); sp->len = READ_ONCE(sqe->len); sp->flags = READ_ONCE(sqe->splice_flags); @@ -2784,6 +2788,48 @@ static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) return 0; } +static int io_tee_prep(struct io_kiocb *req, + const struct io_uring_sqe *sqe) +{ + if (READ_ONCE(sqe->splice_off_in) || READ_ONCE(sqe->off)) + return -EINVAL; + return __io_splice_prep(req, sqe); +} + +static int io_tee(struct io_kiocb *req, bool force_nonblock) +{ + struct io_splice *sp = &req->splice; + struct file *in = sp->file_in; + struct file *out = sp->file_out; + unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; + long ret; + + if (force_nonblock) + return -EAGAIN; + + ret = do_tee(in, out, sp->len, flags); + if (force_nonblock && ret == -EAGAIN) + return -EAGAIN; + + io_put_file(req, in, (sp->flags & SPLICE_F_FD_IN_FIXED)); + req->flags &= ~REQ_F_NEED_CLEANUP; + + io_cqring_add_event(req, ret); + if (ret != sp->len) + req_set_fail_links(req); + io_put_req(req); + return 0; +} + +static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) +{ + struct io_splice* sp = &req->splice; + + sp->off_in = READ_ONCE(sqe->splice_off_in); + sp->off_out = READ_ONCE(sqe->off); + return __io_splice_prep(req, sqe); +} + static int io_splice(struct io_kiocb *req, bool force_nonblock) { struct io_splice *sp = &req->splice; @@ -4978,6 +5024,9 @@ static int io_req_defer_prep(struct io_kiocb *req, case IORING_OP_REMOVE_BUFFERS: ret = io_remove_buffers_prep(req, sqe); break; + case IORING_OP_TEE: + ret = io_tee_prep(req, sqe); + break; default: printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n", req->opcode); @@ -5051,6 +5100,7 @@ static void io_cleanup_req(struct io_kiocb *req) putname(req->open.filename); break; case IORING_OP_SPLICE: + case IORING_OP_TEE: io_put_file(req, req->splice.file_in, (req->splice.flags & SPLICE_F_FD_IN_FIXED)); break; @@ -5281,6 +5331,14 @@ static int io_issue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, } ret = io_remove_buffers(req, force_nonblock); break; + case IORING_OP_TEE: + if (sqe) { + ret = io_tee_prep(req, sqe); + if (ret < 0) + break; + } + ret = io_tee(req, force_nonblock); + break; default: ret = -EINVAL; break; diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h index e48d746b8e2a..a279151437fc 100644 --- a/include/uapi/linux/io_uring.h +++ b/include/uapi/linux/io_uring.h @@ -129,6 +129,7 @@ enum { IORING_OP_SPLICE, IORING_OP_PROVIDE_BUFFERS, IORING_OP_REMOVE_BUFFERS, + IORING_OP_TEE, /* this goes last, obviously */ IORING_OP_LAST, -- 2.24.0
