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https://github.com/torvalds/linux
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fc68fcda04
This behaves like IORING_OP_READ, except: 1) It only supports pollable files (eg pipes, sockets, etc). Note that for sockets, you probably want to use recv/recvmsg with multishot instead. 2) It supports multishot mode, meaning it will repeatedly trigger a read and fill a buffer when data is available. This allows similar use to recv/recvmsg but on non-sockets, where a single request will repeatedly post a CQE whenever data is read from it. 3) Because of #2, it must be used with provided buffers. This is uniformly true across any request type that supports multishot and transfers data, with the reason being that it's obviously not possible to pass in a single buffer for the data, as multiple reads may very well trigger before an application has a chance to process previous CQEs and the data passed from them. Reviewed-by: Gabriel Krisman Bertazi <krisman@suse.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
687 lines
14 KiB
C
687 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* io_uring opcode handling table
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/file.h>
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#include <linux/io_uring.h>
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#include "io_uring.h"
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#include "opdef.h"
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#include "refs.h"
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#include "tctx.h"
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#include "sqpoll.h"
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#include "fdinfo.h"
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#include "kbuf.h"
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#include "rsrc.h"
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#include "xattr.h"
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#include "nop.h"
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#include "fs.h"
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#include "splice.h"
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#include "sync.h"
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#include "advise.h"
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#include "openclose.h"
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#include "uring_cmd.h"
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#include "epoll.h"
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#include "statx.h"
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#include "net.h"
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#include "msg_ring.h"
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#include "timeout.h"
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#include "poll.h"
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#include "cancel.h"
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#include "rw.h"
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static int io_no_issue(struct io_kiocb *req, unsigned int issue_flags)
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{
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WARN_ON_ONCE(1);
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return -ECANCELED;
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}
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static __maybe_unused int io_eopnotsupp_prep(struct io_kiocb *kiocb,
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const struct io_uring_sqe *sqe)
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{
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return -EOPNOTSUPP;
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}
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const struct io_issue_def io_issue_defs[] = {
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[IORING_OP_NOP] = {
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.audit_skip = 1,
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.iopoll = 1,
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.prep = io_nop_prep,
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.issue = io_nop,
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},
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[IORING_OP_READV] = {
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.needs_file = 1,
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.unbound_nonreg_file = 1,
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.pollin = 1,
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.buffer_select = 1,
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.plug = 1,
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.audit_skip = 1,
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.ioprio = 1,
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.iopoll = 1,
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.iopoll_queue = 1,
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.vectored = 1,
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.prep = io_prep_rw,
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.issue = io_read,
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},
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[IORING_OP_WRITEV] = {
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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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.pollout = 1,
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.plug = 1,
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.audit_skip = 1,
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.ioprio = 1,
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.iopoll = 1,
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.iopoll_queue = 1,
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.vectored = 1,
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.prep = io_prep_rw,
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.issue = io_write,
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},
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[IORING_OP_FSYNC] = {
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.needs_file = 1,
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.audit_skip = 1,
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.prep = io_fsync_prep,
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.issue = io_fsync,
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},
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[IORING_OP_READ_FIXED] = {
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.needs_file = 1,
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.unbound_nonreg_file = 1,
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.pollin = 1,
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.plug = 1,
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.audit_skip = 1,
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.ioprio = 1,
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.iopoll = 1,
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.iopoll_queue = 1,
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.prep = io_prep_rw,
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.issue = io_read,
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},
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[IORING_OP_WRITE_FIXED] = {
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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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.pollout = 1,
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.plug = 1,
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.audit_skip = 1,
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.ioprio = 1,
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.iopoll = 1,
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.iopoll_queue = 1,
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.prep = io_prep_rw,
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.issue = io_write,
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},
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[IORING_OP_POLL_ADD] = {
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.needs_file = 1,
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.unbound_nonreg_file = 1,
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.audit_skip = 1,
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.prep = io_poll_add_prep,
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.issue = io_poll_add,
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},
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[IORING_OP_POLL_REMOVE] = {
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.audit_skip = 1,
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.prep = io_poll_remove_prep,
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.issue = io_poll_remove,
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},
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[IORING_OP_SYNC_FILE_RANGE] = {
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.needs_file = 1,
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.audit_skip = 1,
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.prep = io_sfr_prep,
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.issue = io_sync_file_range,
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},
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[IORING_OP_SENDMSG] = {
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.needs_file = 1,
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.unbound_nonreg_file = 1,
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.pollout = 1,
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.ioprio = 1,
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.manual_alloc = 1,
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#if defined(CONFIG_NET)
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.prep = io_sendmsg_prep,
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.issue = io_sendmsg,
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#else
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.prep = io_eopnotsupp_prep,
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#endif
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},
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[IORING_OP_RECVMSG] = {
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.needs_file = 1,
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.unbound_nonreg_file = 1,
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.pollin = 1,
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.buffer_select = 1,
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.ioprio = 1,
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.manual_alloc = 1,
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#if defined(CONFIG_NET)
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.prep = io_recvmsg_prep,
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.issue = io_recvmsg,
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#else
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.prep = io_eopnotsupp_prep,
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#endif
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},
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[IORING_OP_TIMEOUT] = {
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.audit_skip = 1,
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.prep = io_timeout_prep,
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.issue = io_timeout,
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},
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[IORING_OP_TIMEOUT_REMOVE] = {
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/* used by timeout updates' prep() */
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.audit_skip = 1,
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.prep = io_timeout_remove_prep,
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.issue = io_timeout_remove,
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},
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[IORING_OP_ACCEPT] = {
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.needs_file = 1,
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.unbound_nonreg_file = 1,
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.pollin = 1,
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.poll_exclusive = 1,
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.ioprio = 1, /* used for flags */
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#if defined(CONFIG_NET)
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.prep = io_accept_prep,
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.issue = io_accept,
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#else
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.prep = io_eopnotsupp_prep,
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#endif
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},
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[IORING_OP_ASYNC_CANCEL] = {
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.audit_skip = 1,
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.prep = io_async_cancel_prep,
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.issue = io_async_cancel,
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},
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[IORING_OP_LINK_TIMEOUT] = {
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.audit_skip = 1,
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.prep = io_link_timeout_prep,
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.issue = io_no_issue,
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},
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[IORING_OP_CONNECT] = {
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.needs_file = 1,
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.unbound_nonreg_file = 1,
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.pollout = 1,
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#if defined(CONFIG_NET)
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.prep = io_connect_prep,
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.issue = io_connect,
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#else
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.prep = io_eopnotsupp_prep,
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#endif
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},
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[IORING_OP_FALLOCATE] = {
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.needs_file = 1,
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.prep = io_fallocate_prep,
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.issue = io_fallocate,
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},
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[IORING_OP_OPENAT] = {
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.prep = io_openat_prep,
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.issue = io_openat,
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},
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[IORING_OP_CLOSE] = {
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.prep = io_close_prep,
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.issue = io_close,
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},
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[IORING_OP_FILES_UPDATE] = {
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.audit_skip = 1,
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.iopoll = 1,
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.prep = io_files_update_prep,
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.issue = io_files_update,
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},
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[IORING_OP_STATX] = {
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.audit_skip = 1,
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.prep = io_statx_prep,
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.issue = io_statx,
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},
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[IORING_OP_READ] = {
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.needs_file = 1,
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.unbound_nonreg_file = 1,
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.pollin = 1,
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.buffer_select = 1,
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.plug = 1,
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.audit_skip = 1,
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.ioprio = 1,
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.iopoll = 1,
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.iopoll_queue = 1,
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.prep = io_prep_rw,
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.issue = io_read,
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},
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[IORING_OP_WRITE] = {
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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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.pollout = 1,
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.plug = 1,
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.audit_skip = 1,
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.ioprio = 1,
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.iopoll = 1,
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.iopoll_queue = 1,
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.prep = io_prep_rw,
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.issue = io_write,
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},
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[IORING_OP_FADVISE] = {
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.needs_file = 1,
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.audit_skip = 1,
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.prep = io_fadvise_prep,
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.issue = io_fadvise,
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},
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[IORING_OP_MADVISE] = {
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.audit_skip = 1,
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.prep = io_madvise_prep,
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.issue = io_madvise,
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},
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[IORING_OP_SEND] = {
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.needs_file = 1,
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.unbound_nonreg_file = 1,
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.pollout = 1,
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.audit_skip = 1,
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.ioprio = 1,
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.manual_alloc = 1,
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#if defined(CONFIG_NET)
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.prep = io_sendmsg_prep,
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.issue = io_send,
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#else
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.prep = io_eopnotsupp_prep,
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#endif
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},
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[IORING_OP_RECV] = {
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.needs_file = 1,
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.unbound_nonreg_file = 1,
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.pollin = 1,
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.buffer_select = 1,
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.audit_skip = 1,
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.ioprio = 1,
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#if defined(CONFIG_NET)
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.prep = io_recvmsg_prep,
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.issue = io_recv,
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#else
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.prep = io_eopnotsupp_prep,
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#endif
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},
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[IORING_OP_OPENAT2] = {
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.prep = io_openat2_prep,
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.issue = io_openat2,
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},
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[IORING_OP_EPOLL_CTL] = {
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.unbound_nonreg_file = 1,
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.audit_skip = 1,
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#if defined(CONFIG_EPOLL)
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.prep = io_epoll_ctl_prep,
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.issue = io_epoll_ctl,
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#else
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.prep = io_eopnotsupp_prep,
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#endif
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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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.audit_skip = 1,
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.prep = io_splice_prep,
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.issue = io_splice,
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},
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[IORING_OP_PROVIDE_BUFFERS] = {
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.audit_skip = 1,
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.iopoll = 1,
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.prep = io_provide_buffers_prep,
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.issue = io_provide_buffers,
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},
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[IORING_OP_REMOVE_BUFFERS] = {
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.audit_skip = 1,
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.iopoll = 1,
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.prep = io_remove_buffers_prep,
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.issue = io_remove_buffers,
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},
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[IORING_OP_TEE] = {
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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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.audit_skip = 1,
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.prep = io_tee_prep,
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.issue = io_tee,
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},
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[IORING_OP_SHUTDOWN] = {
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.needs_file = 1,
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#if defined(CONFIG_NET)
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.prep = io_shutdown_prep,
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.issue = io_shutdown,
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#else
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.prep = io_eopnotsupp_prep,
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#endif
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},
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[IORING_OP_RENAMEAT] = {
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.prep = io_renameat_prep,
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.issue = io_renameat,
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},
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[IORING_OP_UNLINKAT] = {
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.prep = io_unlinkat_prep,
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.issue = io_unlinkat,
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},
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[IORING_OP_MKDIRAT] = {
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.prep = io_mkdirat_prep,
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.issue = io_mkdirat,
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},
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[IORING_OP_SYMLINKAT] = {
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.prep = io_symlinkat_prep,
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.issue = io_symlinkat,
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},
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[IORING_OP_LINKAT] = {
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.prep = io_linkat_prep,
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.issue = io_linkat,
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},
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[IORING_OP_MSG_RING] = {
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.needs_file = 1,
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.iopoll = 1,
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.prep = io_msg_ring_prep,
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.issue = io_msg_ring,
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},
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[IORING_OP_FSETXATTR] = {
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.needs_file = 1,
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.prep = io_fsetxattr_prep,
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.issue = io_fsetxattr,
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},
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[IORING_OP_SETXATTR] = {
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.prep = io_setxattr_prep,
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.issue = io_setxattr,
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},
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[IORING_OP_FGETXATTR] = {
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.needs_file = 1,
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.prep = io_fgetxattr_prep,
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.issue = io_fgetxattr,
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},
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[IORING_OP_GETXATTR] = {
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.prep = io_getxattr_prep,
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.issue = io_getxattr,
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},
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[IORING_OP_SOCKET] = {
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.audit_skip = 1,
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#if defined(CONFIG_NET)
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.prep = io_socket_prep,
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.issue = io_socket,
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#else
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.prep = io_eopnotsupp_prep,
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#endif
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},
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[IORING_OP_URING_CMD] = {
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.needs_file = 1,
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.plug = 1,
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.iopoll = 1,
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.iopoll_queue = 1,
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.prep = io_uring_cmd_prep,
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.issue = io_uring_cmd,
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},
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[IORING_OP_SEND_ZC] = {
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.needs_file = 1,
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.unbound_nonreg_file = 1,
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.pollout = 1,
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.audit_skip = 1,
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.ioprio = 1,
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.manual_alloc = 1,
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#if defined(CONFIG_NET)
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.prep = io_send_zc_prep,
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.issue = io_send_zc,
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#else
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.prep = io_eopnotsupp_prep,
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#endif
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},
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[IORING_OP_SENDMSG_ZC] = {
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.needs_file = 1,
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.unbound_nonreg_file = 1,
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.pollout = 1,
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.ioprio = 1,
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.manual_alloc = 1,
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#if defined(CONFIG_NET)
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.prep = io_send_zc_prep,
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.issue = io_sendmsg_zc,
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#else
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.prep = io_eopnotsupp_prep,
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#endif
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},
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[IORING_OP_READ_MULTISHOT] = {
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.needs_file = 1,
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.unbound_nonreg_file = 1,
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.pollin = 1,
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.buffer_select = 1,
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.audit_skip = 1,
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.prep = io_read_mshot_prep,
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.issue = io_read_mshot,
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},
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};
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const struct io_cold_def io_cold_defs[] = {
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[IORING_OP_NOP] = {
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.name = "NOP",
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},
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[IORING_OP_READV] = {
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.async_size = sizeof(struct io_async_rw),
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.name = "READV",
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.prep_async = io_readv_prep_async,
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.cleanup = io_readv_writev_cleanup,
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.fail = io_rw_fail,
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},
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[IORING_OP_WRITEV] = {
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.async_size = sizeof(struct io_async_rw),
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.name = "WRITEV",
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.prep_async = io_writev_prep_async,
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.cleanup = io_readv_writev_cleanup,
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.fail = io_rw_fail,
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},
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[IORING_OP_FSYNC] = {
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.name = "FSYNC",
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},
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[IORING_OP_READ_FIXED] = {
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.async_size = sizeof(struct io_async_rw),
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.name = "READ_FIXED",
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.fail = io_rw_fail,
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},
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[IORING_OP_WRITE_FIXED] = {
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.async_size = sizeof(struct io_async_rw),
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.name = "WRITE_FIXED",
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.fail = io_rw_fail,
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},
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[IORING_OP_POLL_ADD] = {
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.name = "POLL_ADD",
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},
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[IORING_OP_POLL_REMOVE] = {
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.name = "POLL_REMOVE",
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},
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[IORING_OP_SYNC_FILE_RANGE] = {
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.name = "SYNC_FILE_RANGE",
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},
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[IORING_OP_SENDMSG] = {
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.name = "SENDMSG",
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#if defined(CONFIG_NET)
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.async_size = sizeof(struct io_async_msghdr),
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.prep_async = io_sendmsg_prep_async,
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.cleanup = io_sendmsg_recvmsg_cleanup,
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.fail = io_sendrecv_fail,
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#endif
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},
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[IORING_OP_RECVMSG] = {
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.name = "RECVMSG",
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#if defined(CONFIG_NET)
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.async_size = sizeof(struct io_async_msghdr),
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.prep_async = io_recvmsg_prep_async,
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.cleanup = io_sendmsg_recvmsg_cleanup,
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.fail = io_sendrecv_fail,
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#endif
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},
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[IORING_OP_TIMEOUT] = {
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|
.async_size = sizeof(struct io_timeout_data),
|
|
.name = "TIMEOUT",
|
|
},
|
|
[IORING_OP_TIMEOUT_REMOVE] = {
|
|
.name = "TIMEOUT_REMOVE",
|
|
},
|
|
[IORING_OP_ACCEPT] = {
|
|
.name = "ACCEPT",
|
|
},
|
|
[IORING_OP_ASYNC_CANCEL] = {
|
|
.name = "ASYNC_CANCEL",
|
|
},
|
|
[IORING_OP_LINK_TIMEOUT] = {
|
|
.async_size = sizeof(struct io_timeout_data),
|
|
.name = "LINK_TIMEOUT",
|
|
},
|
|
[IORING_OP_CONNECT] = {
|
|
.name = "CONNECT",
|
|
#if defined(CONFIG_NET)
|
|
.async_size = sizeof(struct io_async_connect),
|
|
.prep_async = io_connect_prep_async,
|
|
#endif
|
|
},
|
|
[IORING_OP_FALLOCATE] = {
|
|
.name = "FALLOCATE",
|
|
},
|
|
[IORING_OP_OPENAT] = {
|
|
.name = "OPENAT",
|
|
.cleanup = io_open_cleanup,
|
|
},
|
|
[IORING_OP_CLOSE] = {
|
|
.name = "CLOSE",
|
|
},
|
|
[IORING_OP_FILES_UPDATE] = {
|
|
.name = "FILES_UPDATE",
|
|
},
|
|
[IORING_OP_STATX] = {
|
|
.name = "STATX",
|
|
.cleanup = io_statx_cleanup,
|
|
},
|
|
[IORING_OP_READ] = {
|
|
.async_size = sizeof(struct io_async_rw),
|
|
.name = "READ",
|
|
.fail = io_rw_fail,
|
|
},
|
|
[IORING_OP_WRITE] = {
|
|
.async_size = sizeof(struct io_async_rw),
|
|
.name = "WRITE",
|
|
.fail = io_rw_fail,
|
|
},
|
|
[IORING_OP_FADVISE] = {
|
|
.name = "FADVISE",
|
|
},
|
|
[IORING_OP_MADVISE] = {
|
|
.name = "MADVISE",
|
|
},
|
|
[IORING_OP_SEND] = {
|
|
.name = "SEND",
|
|
#if defined(CONFIG_NET)
|
|
.async_size = sizeof(struct io_async_msghdr),
|
|
.fail = io_sendrecv_fail,
|
|
.prep_async = io_send_prep_async,
|
|
#endif
|
|
},
|
|
[IORING_OP_RECV] = {
|
|
.name = "RECV",
|
|
#if defined(CONFIG_NET)
|
|
.fail = io_sendrecv_fail,
|
|
#endif
|
|
},
|
|
[IORING_OP_OPENAT2] = {
|
|
.name = "OPENAT2",
|
|
.cleanup = io_open_cleanup,
|
|
},
|
|
[IORING_OP_EPOLL_CTL] = {
|
|
.name = "EPOLL",
|
|
},
|
|
[IORING_OP_SPLICE] = {
|
|
.name = "SPLICE",
|
|
},
|
|
[IORING_OP_PROVIDE_BUFFERS] = {
|
|
.name = "PROVIDE_BUFFERS",
|
|
},
|
|
[IORING_OP_REMOVE_BUFFERS] = {
|
|
.name = "REMOVE_BUFFERS",
|
|
},
|
|
[IORING_OP_TEE] = {
|
|
.name = "TEE",
|
|
},
|
|
[IORING_OP_SHUTDOWN] = {
|
|
.name = "SHUTDOWN",
|
|
},
|
|
[IORING_OP_RENAMEAT] = {
|
|
.name = "RENAMEAT",
|
|
.cleanup = io_renameat_cleanup,
|
|
},
|
|
[IORING_OP_UNLINKAT] = {
|
|
.name = "UNLINKAT",
|
|
.cleanup = io_unlinkat_cleanup,
|
|
},
|
|
[IORING_OP_MKDIRAT] = {
|
|
.name = "MKDIRAT",
|
|
.cleanup = io_mkdirat_cleanup,
|
|
},
|
|
[IORING_OP_SYMLINKAT] = {
|
|
.name = "SYMLINKAT",
|
|
.cleanup = io_link_cleanup,
|
|
},
|
|
[IORING_OP_LINKAT] = {
|
|
.name = "LINKAT",
|
|
.cleanup = io_link_cleanup,
|
|
},
|
|
[IORING_OP_MSG_RING] = {
|
|
.name = "MSG_RING",
|
|
.cleanup = io_msg_ring_cleanup,
|
|
},
|
|
[IORING_OP_FSETXATTR] = {
|
|
.name = "FSETXATTR",
|
|
.cleanup = io_xattr_cleanup,
|
|
},
|
|
[IORING_OP_SETXATTR] = {
|
|
.name = "SETXATTR",
|
|
.cleanup = io_xattr_cleanup,
|
|
},
|
|
[IORING_OP_FGETXATTR] = {
|
|
.name = "FGETXATTR",
|
|
.cleanup = io_xattr_cleanup,
|
|
},
|
|
[IORING_OP_GETXATTR] = {
|
|
.name = "GETXATTR",
|
|
.cleanup = io_xattr_cleanup,
|
|
},
|
|
[IORING_OP_SOCKET] = {
|
|
.name = "SOCKET",
|
|
},
|
|
[IORING_OP_URING_CMD] = {
|
|
.name = "URING_CMD",
|
|
.async_size = 2 * sizeof(struct io_uring_sqe),
|
|
.prep_async = io_uring_cmd_prep_async,
|
|
},
|
|
[IORING_OP_SEND_ZC] = {
|
|
.name = "SEND_ZC",
|
|
#if defined(CONFIG_NET)
|
|
.async_size = sizeof(struct io_async_msghdr),
|
|
.prep_async = io_send_prep_async,
|
|
.cleanup = io_send_zc_cleanup,
|
|
.fail = io_sendrecv_fail,
|
|
#endif
|
|
},
|
|
[IORING_OP_SENDMSG_ZC] = {
|
|
.name = "SENDMSG_ZC",
|
|
#if defined(CONFIG_NET)
|
|
.async_size = sizeof(struct io_async_msghdr),
|
|
.prep_async = io_sendmsg_prep_async,
|
|
.cleanup = io_send_zc_cleanup,
|
|
.fail = io_sendrecv_fail,
|
|
#endif
|
|
},
|
|
[IORING_OP_READ_MULTISHOT] = {
|
|
.name = "READ_MULTISHOT",
|
|
},
|
|
};
|
|
|
|
const char *io_uring_get_opcode(u8 opcode)
|
|
{
|
|
if (opcode < IORING_OP_LAST)
|
|
return io_cold_defs[opcode].name;
|
|
return "INVALID";
|
|
}
|
|
|
|
void __init io_uring_optable_init(void)
|
|
{
|
|
int i;
|
|
|
|
BUILD_BUG_ON(ARRAY_SIZE(io_cold_defs) != IORING_OP_LAST);
|
|
BUILD_BUG_ON(ARRAY_SIZE(io_issue_defs) != IORING_OP_LAST);
|
|
|
|
for (i = 0; i < ARRAY_SIZE(io_issue_defs); i++) {
|
|
BUG_ON(!io_issue_defs[i].prep);
|
|
if (io_issue_defs[i].prep != io_eopnotsupp_prep)
|
|
BUG_ON(!io_issue_defs[i].issue);
|
|
WARN_ON_ONCE(!io_cold_defs[i].name);
|
|
}
|
|
}
|