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-----BEGIN PGP SIGNATURE----- iQJEBAABCAAuFiEEwPw5LcreJtl1+l5K99NY+ylx4KYFAmWcOk0QHGF4Ym9lQGtl cm5lbC5kawAKCRD301j7KXHgpq2wEACgP1Gvfb2cR65B/6tkLJ6neKnYOPVSYx9F 4Mv6KS306vmOsE67LqynhtAe/Hgfv0NKADN+mKLLV8IdwhneLAwFxRoHl8QPO2dW DIxohDMLIqzY/SOUBqBHMS8b5lEr79UVh8vXjAuuYCBTcHBndi4hj0S0zkwf5YiK Vma6ty+TnzmOv+c6+OCgZZlwFhkxD1pQBM5iOlFRAkdt3Er/2e8FqthK0/od7Fgy Ii9xdxYZU9KTsM4R+IWhqZ1rj1qUdtMPSGzFRbzFt3b6NdANRZT9MUlxvSkuHPIE P/9anpmgu41gd2JbHuyVnw+4jdZMhhZUPUYtphmQ5n35rcFZjv1gnJalH/Nw/DTE 78bDxxP0+35bkuq5MwHfvA3imVsGnvnFx5MlZBoqvv+VK4S3Q6E2+ARQZdiG+2Is 8Uyjzzt0nq2waUO3H1JLkgiM9J9LFqaYQLE68u569m4NCfRSpoZva9KVmNpre2K0 9WdGy2gfzaYAQkGud2TULzeLiEbWfvZAL0o43jYXkVPRKmnffCEphf2X6C2IDV/3 5ZR4bandRRC6DVnE+8n1MB06AYtpJPB/w3rplON+l/V5Gnb7wRNwiUrBr/F15OOy OPbAnP6k56wY/JRpgzdbNqwGi8EvGWX6t3Kqjp2mczhs2as8M193FKS2xppl1TYl BPyTsAfbdQ== =5v/U -----END PGP SIGNATURE----- Merge tag 'for-6.8/io_uring-2024-01-08' of git://git.kernel.dk/linux Pull io_uring updates from Jens Axboe: "Mostly just come fixes and cleanups, but one feature as well. In detail: - Harden the check for handling IOPOLL based on return (Pavel) - Various minor optimizations (Pavel) - Drop remnants of SCM_RIGHTS fd passing support, now that it's no longer supported since 6.7 (me) - Fix for a case where bytes_done wasn't initialized properly on a failure condition for read/write requests (me) - Move the register related code to a separate file (me) - Add support for returning the provided ring buffer head (me) - Add support for adding a direct descriptor to the normal file table (me, Christian Brauner) - Fix for ensuring pending task_work for a ring with DEFER_TASKRUN is run even if we timeout waiting (me)" * tag 'for-6.8/io_uring-2024-01-08' of git://git.kernel.dk/linux: io_uring: ensure local task_work is run on wait timeout io_uring/kbuf: add method for returning provided buffer ring head io_uring/rw: ensure io->bytes_done is always initialized io_uring: drop any code related to SCM_RIGHTS io_uring/unix: drop usage of io_uring socket io_uring/register: move io_uring_register(2) related code to register.c io_uring/openclose: add support for IORING_OP_FIXED_FD_INSTALL io_uring/cmd: inline io_uring_cmd_get_task io_uring/cmd: inline io_uring_cmd_do_in_task_lazy io_uring: split out cmd api into a separate header io_uring: optimise ltimeout for inline execution io_uring: don't check iopoll if request completes
280 lines
7.3 KiB
C
280 lines
7.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/file.h>
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#include <linux/io_uring/cmd.h>
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#include <linux/security.h>
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#include <linux/nospec.h>
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#include <uapi/linux/io_uring.h>
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#include <asm/ioctls.h>
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#include "io_uring.h"
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#include "rsrc.h"
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#include "uring_cmd.h"
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static void io_uring_cmd_del_cancelable(struct io_uring_cmd *cmd,
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unsigned int issue_flags)
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{
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struct io_kiocb *req = cmd_to_io_kiocb(cmd);
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struct io_ring_ctx *ctx = req->ctx;
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if (!(cmd->flags & IORING_URING_CMD_CANCELABLE))
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return;
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cmd->flags &= ~IORING_URING_CMD_CANCELABLE;
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io_ring_submit_lock(ctx, issue_flags);
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hlist_del(&req->hash_node);
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io_ring_submit_unlock(ctx, issue_flags);
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}
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/*
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* Mark this command as concelable, then io_uring_try_cancel_uring_cmd()
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* will try to cancel this issued command by sending ->uring_cmd() with
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* issue_flags of IO_URING_F_CANCEL.
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*
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* The command is guaranteed to not be done when calling ->uring_cmd()
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* with IO_URING_F_CANCEL, but it is driver's responsibility to deal
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* with race between io_uring canceling and normal completion.
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*/
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void io_uring_cmd_mark_cancelable(struct io_uring_cmd *cmd,
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unsigned int issue_flags)
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{
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struct io_kiocb *req = cmd_to_io_kiocb(cmd);
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struct io_ring_ctx *ctx = req->ctx;
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if (!(cmd->flags & IORING_URING_CMD_CANCELABLE)) {
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cmd->flags |= IORING_URING_CMD_CANCELABLE;
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io_ring_submit_lock(ctx, issue_flags);
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hlist_add_head(&req->hash_node, &ctx->cancelable_uring_cmd);
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io_ring_submit_unlock(ctx, issue_flags);
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}
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}
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EXPORT_SYMBOL_GPL(io_uring_cmd_mark_cancelable);
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static void io_uring_cmd_work(struct io_kiocb *req, struct io_tw_state *ts)
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{
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struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
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unsigned issue_flags = ts->locked ? 0 : IO_URING_F_UNLOCKED;
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ioucmd->task_work_cb(ioucmd, issue_flags);
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}
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void __io_uring_cmd_do_in_task(struct io_uring_cmd *ioucmd,
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void (*task_work_cb)(struct io_uring_cmd *, unsigned),
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unsigned flags)
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{
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struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
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ioucmd->task_work_cb = task_work_cb;
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req->io_task_work.func = io_uring_cmd_work;
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__io_req_task_work_add(req, flags);
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}
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EXPORT_SYMBOL_GPL(__io_uring_cmd_do_in_task);
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static inline void io_req_set_cqe32_extra(struct io_kiocb *req,
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u64 extra1, u64 extra2)
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{
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req->big_cqe.extra1 = extra1;
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req->big_cqe.extra2 = extra2;
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}
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/*
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* Called by consumers of io_uring_cmd, if they originally returned
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* -EIOCBQUEUED upon receiving the command.
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*/
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void io_uring_cmd_done(struct io_uring_cmd *ioucmd, ssize_t ret, ssize_t res2,
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unsigned issue_flags)
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{
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struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
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io_uring_cmd_del_cancelable(ioucmd, issue_flags);
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if (ret < 0)
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req_set_fail(req);
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io_req_set_res(req, ret, 0);
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if (req->ctx->flags & IORING_SETUP_CQE32)
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io_req_set_cqe32_extra(req, res2, 0);
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if (req->ctx->flags & IORING_SETUP_IOPOLL) {
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/* order with io_iopoll_req_issued() checking ->iopoll_complete */
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smp_store_release(&req->iopoll_completed, 1);
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} else {
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struct io_tw_state ts = {
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.locked = !(issue_flags & IO_URING_F_UNLOCKED),
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};
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io_req_task_complete(req, &ts);
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}
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}
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EXPORT_SYMBOL_GPL(io_uring_cmd_done);
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int io_uring_cmd_prep_async(struct io_kiocb *req)
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{
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struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
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memcpy(req->async_data, ioucmd->sqe, uring_sqe_size(req->ctx));
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ioucmd->sqe = req->async_data;
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return 0;
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}
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int io_uring_cmd_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
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{
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struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
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if (sqe->__pad1)
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return -EINVAL;
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ioucmd->flags = READ_ONCE(sqe->uring_cmd_flags);
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if (ioucmd->flags & ~IORING_URING_CMD_MASK)
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return -EINVAL;
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if (ioucmd->flags & IORING_URING_CMD_FIXED) {
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struct io_ring_ctx *ctx = req->ctx;
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u16 index;
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req->buf_index = READ_ONCE(sqe->buf_index);
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if (unlikely(req->buf_index >= ctx->nr_user_bufs))
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return -EFAULT;
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index = array_index_nospec(req->buf_index, ctx->nr_user_bufs);
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req->imu = ctx->user_bufs[index];
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io_req_set_rsrc_node(req, ctx, 0);
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}
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ioucmd->sqe = sqe;
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ioucmd->cmd_op = READ_ONCE(sqe->cmd_op);
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return 0;
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}
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int io_uring_cmd(struct io_kiocb *req, unsigned int issue_flags)
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{
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struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
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struct io_ring_ctx *ctx = req->ctx;
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struct file *file = req->file;
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int ret;
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if (!file->f_op->uring_cmd)
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return -EOPNOTSUPP;
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ret = security_uring_cmd(ioucmd);
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if (ret)
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return ret;
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if (ctx->flags & IORING_SETUP_SQE128)
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issue_flags |= IO_URING_F_SQE128;
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if (ctx->flags & IORING_SETUP_CQE32)
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issue_flags |= IO_URING_F_CQE32;
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if (ctx->compat)
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issue_flags |= IO_URING_F_COMPAT;
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if (ctx->flags & IORING_SETUP_IOPOLL) {
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if (!file->f_op->uring_cmd_iopoll)
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return -EOPNOTSUPP;
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issue_flags |= IO_URING_F_IOPOLL;
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req->iopoll_completed = 0;
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}
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ret = file->f_op->uring_cmd(ioucmd, issue_flags);
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if (ret == -EAGAIN) {
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if (!req_has_async_data(req)) {
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if (io_alloc_async_data(req))
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return -ENOMEM;
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io_uring_cmd_prep_async(req);
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}
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return -EAGAIN;
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}
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if (ret != -EIOCBQUEUED) {
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if (ret < 0)
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req_set_fail(req);
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io_req_set_res(req, ret, 0);
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return ret;
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}
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return IOU_ISSUE_SKIP_COMPLETE;
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}
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int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw,
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struct iov_iter *iter, void *ioucmd)
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{
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struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
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return io_import_fixed(rw, iter, req->imu, ubuf, len);
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}
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EXPORT_SYMBOL_GPL(io_uring_cmd_import_fixed);
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static inline int io_uring_cmd_getsockopt(struct socket *sock,
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struct io_uring_cmd *cmd,
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unsigned int issue_flags)
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{
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bool compat = !!(issue_flags & IO_URING_F_COMPAT);
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int optlen, optname, level, err;
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void __user *optval;
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level = READ_ONCE(cmd->sqe->level);
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if (level != SOL_SOCKET)
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return -EOPNOTSUPP;
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optval = u64_to_user_ptr(READ_ONCE(cmd->sqe->optval));
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optname = READ_ONCE(cmd->sqe->optname);
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optlen = READ_ONCE(cmd->sqe->optlen);
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err = do_sock_getsockopt(sock, compat, level, optname,
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USER_SOCKPTR(optval),
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KERNEL_SOCKPTR(&optlen));
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if (err)
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return err;
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/* On success, return optlen */
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return optlen;
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}
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static inline int io_uring_cmd_setsockopt(struct socket *sock,
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struct io_uring_cmd *cmd,
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unsigned int issue_flags)
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{
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bool compat = !!(issue_flags & IO_URING_F_COMPAT);
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int optname, optlen, level;
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void __user *optval;
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sockptr_t optval_s;
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optval = u64_to_user_ptr(READ_ONCE(cmd->sqe->optval));
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optname = READ_ONCE(cmd->sqe->optname);
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optlen = READ_ONCE(cmd->sqe->optlen);
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level = READ_ONCE(cmd->sqe->level);
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optval_s = USER_SOCKPTR(optval);
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return do_sock_setsockopt(sock, compat, level, optname, optval_s,
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optlen);
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}
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#if defined(CONFIG_NET)
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int io_uring_cmd_sock(struct io_uring_cmd *cmd, unsigned int issue_flags)
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{
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struct socket *sock = cmd->file->private_data;
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struct sock *sk = sock->sk;
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struct proto *prot = READ_ONCE(sk->sk_prot);
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int ret, arg = 0;
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if (!prot || !prot->ioctl)
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return -EOPNOTSUPP;
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switch (cmd->sqe->cmd_op) {
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case SOCKET_URING_OP_SIOCINQ:
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ret = prot->ioctl(sk, SIOCINQ, &arg);
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if (ret)
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return ret;
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return arg;
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case SOCKET_URING_OP_SIOCOUTQ:
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ret = prot->ioctl(sk, SIOCOUTQ, &arg);
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if (ret)
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return ret;
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return arg;
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case SOCKET_URING_OP_GETSOCKOPT:
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return io_uring_cmd_getsockopt(sock, cmd, issue_flags);
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case SOCKET_URING_OP_SETSOCKOPT:
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return io_uring_cmd_setsockopt(sock, cmd, issue_flags);
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default:
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return -EOPNOTSUPP;
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}
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}
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EXPORT_SYMBOL_GPL(io_uring_cmd_sock);
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#endif
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