diff --git a/fs/io_uring.c b/fs/io_uring.c index 6c531aae8f5885782bf45a6a7db7cf8e66cb7e39..24962368a3b50be98d406a385b77e7bb77c23044 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -76,6 +76,7 @@ #include #include #include +#include #define CREATE_TRACE_POINTS #include @@ -430,6 +431,15 @@ struct io_epoll { struct epoll_event event; }; +struct io_splice { + struct file *file_out; + struct file *file_in; + loff_t off_out; + loff_t off_in; + u64 len; + unsigned int flags; +}; + struct io_async_connect { struct sockaddr_storage address; }; @@ -546,6 +556,7 @@ struct io_kiocb { struct io_fadvise fadvise; struct io_madvise madvise; struct io_epoll epoll; + struct io_splice splice; }; struct io_async_ctx *io; @@ -746,6 +757,11 @@ static const struct io_op_def io_op_defs[] = { .unbound_nonreg_file = 1, .file_table = 1, }, + [IORING_OP_SPLICE] = { + .needs_file = 1, + .hash_reg_file = 1, + .unbound_nonreg_file = 1, + } }; static void io_wq_submit_work(struct io_wq_work **workptr); @@ -760,6 +776,10 @@ static int __io_sqe_files_update(struct io_ring_ctx *ctx, static int io_grab_files(struct io_kiocb *req); static void io_ring_file_ref_flush(struct fixed_file_data *data); static void io_cleanup_req(struct io_kiocb *req); +static int io_file_get(struct io_submit_state *state, + struct io_kiocb *req, + int fd, struct file **out_file, + bool fixed); static struct kmem_cache *req_cachep; @@ -2409,6 +2429,77 @@ static int io_write(struct io_kiocb *req, struct io_kiocb **nxt, return ret; } +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; + int ret; + + if (req->flags & REQ_F_NEED_CLEANUP) + 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); + + if (unlikely(sp->flags & ~valid_flags)) + return -EINVAL; + + ret = io_file_get(NULL, req, READ_ONCE(sqe->splice_fd_in), &sp->file_in, + (sp->flags & SPLICE_F_FD_IN_FIXED)); + if (ret) + return ret; + req->flags |= REQ_F_NEED_CLEANUP; + + if (!S_ISREG(file_inode(sp->file_in)->i_mode)) + req->work.flags |= IO_WQ_WORK_UNBOUND; + + return 0; +} + +static bool io_splice_punt(struct file *file) +{ + if (get_pipe_info(file)) + return false; + if (!io_file_supports_async(file)) + return true; + return !(file->f_mode & O_NONBLOCK); +} + +static int io_splice(struct io_kiocb *req, struct io_kiocb **nxt, + 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; + loff_t *poff_in, *poff_out; + long ret; + + if (force_nonblock) { + if (io_splice_punt(in) || io_splice_punt(out)) + return -EAGAIN; + flags |= SPLICE_F_NONBLOCK; + } + + poff_in = (sp->off_in == -1) ? NULL : &sp->off_in; + poff_out = (sp->off_out == -1) ? NULL : &sp->off_out; + ret = do_splice(in, poff_in, out, poff_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_find_next(req, nxt); + return 0; +} + /* * IORING_OP_NOP just posts a completion event, nothing else. */ @@ -4242,6 +4333,9 @@ static int io_req_defer_prep(struct io_kiocb *req, case IORING_OP_EPOLL_CTL: ret = io_epoll_ctl_prep(req, sqe); break; + case IORING_OP_SPLICE: + ret = io_splice_prep(req, sqe); + break; default: printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n", req->opcode); @@ -4304,6 +4398,10 @@ static void io_cleanup_req(struct io_kiocb *req) case IORING_OP_STATX: putname(req->open.filename); break; + case IORING_OP_SPLICE: + io_put_file(req, req->splice.file_in, + (req->splice.flags & SPLICE_F_FD_IN_FIXED)); + break; } req->flags &= ~REQ_F_NEED_CLEANUP; @@ -4507,6 +4605,14 @@ static int io_issue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, } ret = io_epoll_ctl(req, nxt, force_nonblock); break; + case IORING_OP_SPLICE: + if (sqe) { + ret = io_splice_prep(req, sqe); + if (ret < 0) + break; + } + ret = io_splice(req, nxt, force_nonblock); + break; default: ret = -EINVAL; break; @@ -7271,6 +7377,7 @@ static int __init io_uring_init(void) BUILD_BUG_SQE_ELEM(8, __u64, off); BUILD_BUG_SQE_ELEM(8, __u64, addr2); BUILD_BUG_SQE_ELEM(16, __u64, addr); + BUILD_BUG_SQE_ELEM(16, __u64, splice_off_in); BUILD_BUG_SQE_ELEM(24, __u32, len); BUILD_BUG_SQE_ELEM(28, __kernel_rwf_t, rw_flags); BUILD_BUG_SQE_ELEM(28, /* compat */ int, rw_flags); @@ -7285,9 +7392,11 @@ static int __init io_uring_init(void) BUILD_BUG_SQE_ELEM(28, __u32, open_flags); BUILD_BUG_SQE_ELEM(28, __u32, statx_flags); BUILD_BUG_SQE_ELEM(28, __u32, fadvise_advice); + BUILD_BUG_SQE_ELEM(28, __u32, splice_flags); BUILD_BUG_SQE_ELEM(32, __u64, user_data); BUILD_BUG_SQE_ELEM(40, __u16, buf_index); BUILD_BUG_SQE_ELEM(42, __u16, personality); + BUILD_BUG_SQE_ELEM(44, __s32, splice_fd_in); BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST); req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC); diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h index 3f7961c1c24322447c2c48239388044739e8b4c3..08891cc1c1e784845abda5643209bc45c3fa075c 100644 --- a/include/uapi/linux/io_uring.h +++ b/include/uapi/linux/io_uring.h @@ -23,7 +23,10 @@ struct io_uring_sqe { __u64 off; /* offset into file */ __u64 addr2; }; - __u64 addr; /* pointer to buffer or iovecs */ + union { + __u64 addr; /* pointer to buffer or iovecs */ + __u64 splice_off_in; + }; __u32 len; /* buffer size or number of iovecs */ union { __kernel_rwf_t rw_flags; @@ -37,6 +40,7 @@ struct io_uring_sqe { __u32 open_flags; __u32 statx_flags; __u32 fadvise_advice; + __u32 splice_flags; }; __u64 user_data; /* data to be passed back at completion time */ union { @@ -45,6 +49,7 @@ struct io_uring_sqe { __u16 buf_index; /* personality to use, if used */ __u16 personality; + __s32 splice_fd_in; }; __u64 __pad2[3]; }; @@ -113,6 +118,7 @@ enum { IORING_OP_RECV, IORING_OP_OPENAT2, IORING_OP_EPOLL_CTL, + IORING_OP_SPLICE, /* this goes last, obviously */ IORING_OP_LAST, @@ -128,6 +134,12 @@ enum { */ #define IORING_TIMEOUT_ABS (1U << 0) +/* + * sqe->splice_flags + * extends splice(2) flags + */ +#define SPLICE_F_FD_IN_FIXED (1U << 31) /* the last bit of __u32 */ + /* * IO completion data structure (Completion Queue Entry) */