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io_uring: add splice(2) support
Add support for splice(2). - output file is specified as sqe->fd, so it's handled by generic code - hash_reg_file handled by generic code as well - len is 32bit, but should be fine - the fd_in is registered file, when SPLICE_F_FD_IN_FIXED is set, which is a splice flag (i.e. sqe->splice_flags). Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov
Jens Axboe
parent
8da11c1994
commit
7d67af2c01
2 changed files with 122 additions and 1 deletions
109
fs/io_uring.c
109
fs/io_uring.c
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@ -76,6 +76,7 @@
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#include <linux/fadvise.h>
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#include <linux/eventpoll.h>
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#include <linux/fs_struct.h>
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#include <linux/splice.h>
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#define CREATE_TRACE_POINTS
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#include <trace/events/io_uring.h>
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@ -428,6 +429,15 @@ struct io_epoll {
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struct epoll_event event;
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};
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struct io_splice {
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struct file *file_out;
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struct file *file_in;
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loff_t off_out;
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loff_t off_in;
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u64 len;
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unsigned int flags;
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};
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struct io_async_connect {
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struct sockaddr_storage address;
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};
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@ -544,6 +554,7 @@ struct io_kiocb {
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struct io_fadvise fadvise;
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struct io_madvise madvise;
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struct io_epoll epoll;
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struct io_splice splice;
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};
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struct io_async_ctx *io;
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@ -744,6 +755,11 @@ static const struct io_op_def io_op_defs[] = {
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.unbound_nonreg_file = 1,
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.file_table = 1,
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},
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[IORING_OP_SPLICE] = {
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.needs_file = 1,
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.hash_reg_file = 1,
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.unbound_nonreg_file = 1,
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}
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};
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static void io_wq_submit_work(struct io_wq_work **workptr);
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@ -758,6 +774,10 @@ static int __io_sqe_files_update(struct io_ring_ctx *ctx,
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static int io_grab_files(struct io_kiocb *req);
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static void io_ring_file_ref_flush(struct fixed_file_data *data);
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static void io_cleanup_req(struct io_kiocb *req);
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static int io_file_get(struct io_submit_state *state,
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struct io_kiocb *req,
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int fd, struct file **out_file,
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bool fixed);
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static struct kmem_cache *req_cachep;
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@ -2404,6 +2424,77 @@ static int io_write(struct io_kiocb *req, struct io_kiocb **nxt,
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return ret;
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}
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static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
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{
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struct io_splice* sp = &req->splice;
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unsigned int valid_flags = SPLICE_F_FD_IN_FIXED | SPLICE_F_ALL;
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int ret;
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if (req->flags & REQ_F_NEED_CLEANUP)
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return 0;
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sp->file_in = NULL;
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sp->off_in = READ_ONCE(sqe->splice_off_in);
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sp->off_out = READ_ONCE(sqe->off);
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sp->len = READ_ONCE(sqe->len);
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sp->flags = READ_ONCE(sqe->splice_flags);
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if (unlikely(sp->flags & ~valid_flags))
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return -EINVAL;
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ret = io_file_get(NULL, req, READ_ONCE(sqe->splice_fd_in), &sp->file_in,
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(sp->flags & SPLICE_F_FD_IN_FIXED));
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if (ret)
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return ret;
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req->flags |= REQ_F_NEED_CLEANUP;
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if (!S_ISREG(file_inode(sp->file_in)->i_mode))
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req->work.flags |= IO_WQ_WORK_UNBOUND;
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return 0;
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}
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static bool io_splice_punt(struct file *file)
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{
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if (get_pipe_info(file))
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return false;
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if (!io_file_supports_async(file))
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return true;
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return !(file->f_mode & O_NONBLOCK);
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}
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static int io_splice(struct io_kiocb *req, struct io_kiocb **nxt,
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bool force_nonblock)
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{
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struct io_splice *sp = &req->splice;
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struct file *in = sp->file_in;
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struct file *out = sp->file_out;
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unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED;
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loff_t *poff_in, *poff_out;
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long ret;
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if (force_nonblock) {
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if (io_splice_punt(in) || io_splice_punt(out))
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return -EAGAIN;
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flags |= SPLICE_F_NONBLOCK;
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}
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poff_in = (sp->off_in == -1) ? NULL : &sp->off_in;
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poff_out = (sp->off_out == -1) ? NULL : &sp->off_out;
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ret = do_splice(in, poff_in, out, poff_out, sp->len, flags);
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if (force_nonblock && ret == -EAGAIN)
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return -EAGAIN;
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io_put_file(req, in, (sp->flags & SPLICE_F_FD_IN_FIXED));
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req->flags &= ~REQ_F_NEED_CLEANUP;
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io_cqring_add_event(req, ret);
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if (ret != sp->len)
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req_set_fail_links(req);
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io_put_req_find_next(req, nxt);
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return 0;
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}
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/*
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* IORING_OP_NOP just posts a completion event, nothing else.
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*/
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@ -4230,6 +4321,9 @@ static int io_req_defer_prep(struct io_kiocb *req,
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case IORING_OP_EPOLL_CTL:
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ret = io_epoll_ctl_prep(req, sqe);
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break;
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case IORING_OP_SPLICE:
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ret = io_splice_prep(req, sqe);
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break;
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default:
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printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n",
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req->opcode);
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@ -4292,6 +4386,10 @@ static void io_cleanup_req(struct io_kiocb *req)
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case IORING_OP_STATX:
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putname(req->open.filename);
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break;
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case IORING_OP_SPLICE:
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io_put_file(req, req->splice.file_in,
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(req->splice.flags & SPLICE_F_FD_IN_FIXED));
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break;
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}
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req->flags &= ~REQ_F_NEED_CLEANUP;
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@ -4495,6 +4593,14 @@ static int io_issue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe,
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}
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ret = io_epoll_ctl(req, nxt, force_nonblock);
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break;
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case IORING_OP_SPLICE:
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if (sqe) {
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ret = io_splice_prep(req, sqe);
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if (ret < 0)
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break;
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}
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ret = io_splice(req, nxt, force_nonblock);
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break;
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default:
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ret = -EINVAL;
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break;
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@ -7230,6 +7336,7 @@ static int __init io_uring_init(void)
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BUILD_BUG_SQE_ELEM(8, __u64, off);
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BUILD_BUG_SQE_ELEM(8, __u64, addr2);
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BUILD_BUG_SQE_ELEM(16, __u64, addr);
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BUILD_BUG_SQE_ELEM(16, __u64, splice_off_in);
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BUILD_BUG_SQE_ELEM(24, __u32, len);
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BUILD_BUG_SQE_ELEM(28, __kernel_rwf_t, rw_flags);
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BUILD_BUG_SQE_ELEM(28, /* compat */ int, rw_flags);
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@ -7244,9 +7351,11 @@ static int __init io_uring_init(void)
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BUILD_BUG_SQE_ELEM(28, __u32, open_flags);
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BUILD_BUG_SQE_ELEM(28, __u32, statx_flags);
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BUILD_BUG_SQE_ELEM(28, __u32, fadvise_advice);
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BUILD_BUG_SQE_ELEM(28, __u32, splice_flags);
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BUILD_BUG_SQE_ELEM(32, __u64, user_data);
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BUILD_BUG_SQE_ELEM(40, __u16, buf_index);
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BUILD_BUG_SQE_ELEM(42, __u16, personality);
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BUILD_BUG_SQE_ELEM(44, __s32, splice_fd_in);
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BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST);
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req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC);
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@ -23,7 +23,10 @@ struct io_uring_sqe {
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__u64 off; /* offset into file */
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__u64 addr2;
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};
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__u64 addr; /* pointer to buffer or iovecs */
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union {
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__u64 addr; /* pointer to buffer or iovecs */
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__u64 splice_off_in;
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};
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__u32 len; /* buffer size or number of iovecs */
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union {
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__kernel_rwf_t rw_flags;
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@ -37,6 +40,7 @@ struct io_uring_sqe {
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__u32 open_flags;
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__u32 statx_flags;
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__u32 fadvise_advice;
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__u32 splice_flags;
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};
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__u64 user_data; /* data to be passed back at completion time */
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union {
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@ -45,6 +49,7 @@ struct io_uring_sqe {
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__u16 buf_index;
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/* personality to use, if used */
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__u16 personality;
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__s32 splice_fd_in;
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};
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__u64 __pad2[3];
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};
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@ -113,6 +118,7 @@ enum {
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IORING_OP_RECV,
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IORING_OP_OPENAT2,
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IORING_OP_EPOLL_CTL,
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IORING_OP_SPLICE,
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/* this goes last, obviously */
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IORING_OP_LAST,
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@ -128,6 +134,12 @@ enum {
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*/
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#define IORING_TIMEOUT_ABS (1U << 0)
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/*
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* sqe->splice_flags
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* extends splice(2) flags
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*/
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#define SPLICE_F_FD_IN_FIXED (1U << 31) /* the last bit of __u32 */
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/*
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* IO completion data structure (Completion Queue Entry)
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*/
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