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https://github.com/torvalds/linux
synced 2024-10-06 19:34:19 +00:00
io_uring: move cancelation into its own file
This also helps cleanup the io_uring.h cancel parts, as we can make things static in the cancel.c file, mostly. Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe
parent
329061d3e2
commit
7aaff708a7
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@ -6,5 +6,6 @@ obj-$(CONFIG_IO_URING) += io_uring.o xattr.o nop.o fs.o splice.o \
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sync.o advise.o filetable.o \
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openclose.o uring_cmd.o epoll.o \
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statx.o net.o msg_ring.o timeout.o \
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sqpoll.o fdinfo.o tctx.o poll.o
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sqpoll.o fdinfo.o tctx.o poll.o \
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cancel.o
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obj-$(CONFIG_IO_WQ) += io-wq.o
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194
io_uring/cancel.c
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194
io_uring/cancel.c
Normal file
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@ -0,0 +1,194 @@
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// 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/fs.h>
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#include <linux/file.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/namei.h>
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#include <linux/io_uring.h>
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#include <uapi/linux/io_uring.h>
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#include "io_uring_types.h"
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#include "io_uring.h"
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#include "tctx.h"
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#include "poll.h"
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#include "timeout.h"
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#include "cancel.h"
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struct io_cancel {
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struct file *file;
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u64 addr;
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u32 flags;
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s32 fd;
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};
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#define CANCEL_FLAGS (IORING_ASYNC_CANCEL_ALL | IORING_ASYNC_CANCEL_FD | \
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IORING_ASYNC_CANCEL_ANY)
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static bool io_cancel_cb(struct io_wq_work *work, void *data)
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{
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struct io_kiocb *req = container_of(work, struct io_kiocb, work);
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struct io_cancel_data *cd = data;
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if (req->ctx != cd->ctx)
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return false;
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if (cd->flags & IORING_ASYNC_CANCEL_ANY) {
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;
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} else if (cd->flags & IORING_ASYNC_CANCEL_FD) {
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if (req->file != cd->file)
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return false;
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} else {
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if (req->cqe.user_data != cd->data)
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return false;
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}
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if (cd->flags & (IORING_ASYNC_CANCEL_ALL|IORING_ASYNC_CANCEL_ANY)) {
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if (cd->seq == req->work.cancel_seq)
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return false;
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req->work.cancel_seq = cd->seq;
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}
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return true;
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}
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static int io_async_cancel_one(struct io_uring_task *tctx,
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struct io_cancel_data *cd)
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{
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enum io_wq_cancel cancel_ret;
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int ret = 0;
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bool all;
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if (!tctx || !tctx->io_wq)
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return -ENOENT;
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all = cd->flags & (IORING_ASYNC_CANCEL_ALL|IORING_ASYNC_CANCEL_ANY);
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cancel_ret = io_wq_cancel_cb(tctx->io_wq, io_cancel_cb, cd, all);
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switch (cancel_ret) {
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case IO_WQ_CANCEL_OK:
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ret = 0;
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break;
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case IO_WQ_CANCEL_RUNNING:
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ret = -EALREADY;
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break;
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case IO_WQ_CANCEL_NOTFOUND:
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ret = -ENOENT;
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break;
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}
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return ret;
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}
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int io_try_cancel(struct io_kiocb *req, struct io_cancel_data *cd)
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{
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struct io_ring_ctx *ctx = req->ctx;
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int ret;
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WARN_ON_ONCE(!io_wq_current_is_worker() && req->task != current);
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ret = io_async_cancel_one(req->task->io_uring, cd);
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/*
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* Fall-through even for -EALREADY, as we may have poll armed
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* that need unarming.
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*/
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if (!ret)
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return 0;
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spin_lock(&ctx->completion_lock);
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ret = io_poll_cancel(ctx, cd);
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if (ret != -ENOENT)
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goto out;
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if (!(cd->flags & IORING_ASYNC_CANCEL_FD))
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ret = io_timeout_cancel(ctx, cd);
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out:
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spin_unlock(&ctx->completion_lock);
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return ret;
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}
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int io_async_cancel_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
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{
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struct io_cancel *cancel = io_kiocb_to_cmd(req);
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if (unlikely(req->flags & REQ_F_BUFFER_SELECT))
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return -EINVAL;
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if (sqe->off || sqe->len || sqe->splice_fd_in)
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return -EINVAL;
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cancel->addr = READ_ONCE(sqe->addr);
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cancel->flags = READ_ONCE(sqe->cancel_flags);
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if (cancel->flags & ~CANCEL_FLAGS)
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return -EINVAL;
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if (cancel->flags & IORING_ASYNC_CANCEL_FD) {
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if (cancel->flags & IORING_ASYNC_CANCEL_ANY)
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return -EINVAL;
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cancel->fd = READ_ONCE(sqe->fd);
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}
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return 0;
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}
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static int __io_async_cancel(struct io_cancel_data *cd, struct io_kiocb *req,
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unsigned int issue_flags)
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{
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bool all = cd->flags & (IORING_ASYNC_CANCEL_ALL|IORING_ASYNC_CANCEL_ANY);
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struct io_ring_ctx *ctx = cd->ctx;
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struct io_tctx_node *node;
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int ret, nr = 0;
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do {
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ret = io_try_cancel(req, cd);
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if (ret == -ENOENT)
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break;
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if (!all)
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return ret;
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nr++;
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} while (1);
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/* slow path, try all io-wq's */
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io_ring_submit_lock(ctx, issue_flags);
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ret = -ENOENT;
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list_for_each_entry(node, &ctx->tctx_list, ctx_node) {
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struct io_uring_task *tctx = node->task->io_uring;
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ret = io_async_cancel_one(tctx, cd);
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if (ret != -ENOENT) {
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if (!all)
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break;
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nr++;
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}
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}
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io_ring_submit_unlock(ctx, issue_flags);
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return all ? nr : ret;
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}
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int io_async_cancel(struct io_kiocb *req, unsigned int issue_flags)
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{
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struct io_cancel *cancel = io_kiocb_to_cmd(req);
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struct io_cancel_data cd = {
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.ctx = req->ctx,
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.data = cancel->addr,
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.flags = cancel->flags,
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.seq = atomic_inc_return(&req->ctx->cancel_seq),
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};
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int ret;
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if (cd.flags & IORING_ASYNC_CANCEL_FD) {
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if (req->flags & REQ_F_FIXED_FILE)
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req->file = io_file_get_fixed(req, cancel->fd,
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issue_flags);
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else
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req->file = io_file_get_normal(req, cancel->fd);
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if (!req->file) {
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ret = -EBADF;
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goto done;
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}
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cd.file = req->file;
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}
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ret = __io_async_cancel(&cd, req, issue_flags);
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done:
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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 IOU_OK;
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}
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6
io_uring/cancel.h
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6
io_uring/cancel.h
Normal file
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@ -0,0 +1,6 @@
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// SPDX-License-Identifier: GPL-2.0
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int io_async_cancel_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
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int io_async_cancel(struct io_kiocb *req, unsigned int issue_flags);
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int io_try_cancel(struct io_kiocb *req, struct io_cancel_data *cd);
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@ -108,6 +108,7 @@
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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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#define IORING_MAX_ENTRIES 32768
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#define IORING_MAX_CQ_ENTRIES (2 * IORING_MAX_ENTRIES)
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@ -210,13 +211,6 @@ struct io_buffer {
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* First field must be the file pointer in all the
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* iocb unions! See also 'struct kiocb' in <linux/fs.h>
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*/
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struct io_cancel {
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struct file *file;
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u64 addr;
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u32 flags;
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s32 fd;
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};
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struct io_rw {
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/* NOTE: kiocb has the file as the first member, so don't do it here */
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struct kiocb kiocb;
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@ -3362,175 +3356,6 @@ static __maybe_unused int io_eopnotsupp_prep(struct io_kiocb *kiocb,
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return -EOPNOTSUPP;
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}
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static bool io_cancel_cb(struct io_wq_work *work, void *data)
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{
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struct io_kiocb *req = container_of(work, struct io_kiocb, work);
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struct io_cancel_data *cd = data;
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if (req->ctx != cd->ctx)
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return false;
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if (cd->flags & IORING_ASYNC_CANCEL_ANY) {
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;
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} else if (cd->flags & IORING_ASYNC_CANCEL_FD) {
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if (req->file != cd->file)
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return false;
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} else {
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if (req->cqe.user_data != cd->data)
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return false;
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}
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if (cd->flags & (IORING_ASYNC_CANCEL_ALL|IORING_ASYNC_CANCEL_ANY)) {
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if (cd->seq == req->work.cancel_seq)
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return false;
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req->work.cancel_seq = cd->seq;
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}
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return true;
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}
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static int io_async_cancel_one(struct io_uring_task *tctx,
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struct io_cancel_data *cd)
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{
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enum io_wq_cancel cancel_ret;
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int ret = 0;
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bool all;
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if (!tctx || !tctx->io_wq)
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return -ENOENT;
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all = cd->flags & (IORING_ASYNC_CANCEL_ALL|IORING_ASYNC_CANCEL_ANY);
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cancel_ret = io_wq_cancel_cb(tctx->io_wq, io_cancel_cb, cd, all);
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switch (cancel_ret) {
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case IO_WQ_CANCEL_OK:
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ret = 0;
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break;
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case IO_WQ_CANCEL_RUNNING:
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ret = -EALREADY;
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break;
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case IO_WQ_CANCEL_NOTFOUND:
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ret = -ENOENT;
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break;
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}
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return ret;
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}
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int io_try_cancel(struct io_kiocb *req, struct io_cancel_data *cd)
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{
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struct io_ring_ctx *ctx = req->ctx;
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int ret;
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WARN_ON_ONCE(!io_wq_current_is_worker() && req->task != current);
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ret = io_async_cancel_one(req->task->io_uring, cd);
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/*
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* Fall-through even for -EALREADY, as we may have poll armed
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* that need unarming.
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*/
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if (!ret)
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return 0;
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spin_lock(&ctx->completion_lock);
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ret = io_poll_cancel(ctx, cd);
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if (ret != -ENOENT)
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goto out;
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if (!(cd->flags & IORING_ASYNC_CANCEL_FD))
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ret = io_timeout_cancel(ctx, cd);
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out:
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spin_unlock(&ctx->completion_lock);
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return ret;
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}
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#define CANCEL_FLAGS (IORING_ASYNC_CANCEL_ALL | IORING_ASYNC_CANCEL_FD | \
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IORING_ASYNC_CANCEL_ANY)
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static int io_async_cancel_prep(struct io_kiocb *req,
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const struct io_uring_sqe *sqe)
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{
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struct io_cancel *cancel = io_kiocb_to_cmd(req);
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if (unlikely(req->flags & REQ_F_BUFFER_SELECT))
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return -EINVAL;
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if (sqe->off || sqe->len || sqe->splice_fd_in)
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return -EINVAL;
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cancel->addr = READ_ONCE(sqe->addr);
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cancel->flags = READ_ONCE(sqe->cancel_flags);
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if (cancel->flags & ~CANCEL_FLAGS)
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return -EINVAL;
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if (cancel->flags & IORING_ASYNC_CANCEL_FD) {
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if (cancel->flags & IORING_ASYNC_CANCEL_ANY)
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return -EINVAL;
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cancel->fd = READ_ONCE(sqe->fd);
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}
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return 0;
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}
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static int __io_async_cancel(struct io_cancel_data *cd, struct io_kiocb *req,
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unsigned int issue_flags)
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{
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bool all = cd->flags & (IORING_ASYNC_CANCEL_ALL|IORING_ASYNC_CANCEL_ANY);
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struct io_ring_ctx *ctx = cd->ctx;
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struct io_tctx_node *node;
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int ret, nr = 0;
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do {
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ret = io_try_cancel(req, cd);
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if (ret == -ENOENT)
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break;
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if (!all)
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return ret;
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nr++;
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} while (1);
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/* slow path, try all io-wq's */
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io_ring_submit_lock(ctx, issue_flags);
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ret = -ENOENT;
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list_for_each_entry(node, &ctx->tctx_list, ctx_node) {
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struct io_uring_task *tctx = node->task->io_uring;
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ret = io_async_cancel_one(tctx, cd);
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if (ret != -ENOENT) {
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if (!all)
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break;
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nr++;
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}
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}
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io_ring_submit_unlock(ctx, issue_flags);
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return all ? nr : ret;
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}
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static int io_async_cancel(struct io_kiocb *req, unsigned int issue_flags)
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{
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struct io_cancel *cancel = io_kiocb_to_cmd(req);
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struct io_cancel_data cd = {
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.ctx = req->ctx,
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.data = cancel->addr,
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.flags = cancel->flags,
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.seq = atomic_inc_return(&req->ctx->cancel_seq),
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};
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int ret;
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if (cd.flags & IORING_ASYNC_CANCEL_FD) {
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if (req->flags & REQ_F_FIXED_FILE)
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req->file = io_file_get_fixed(req, cancel->fd,
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issue_flags);
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else
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req->file = io_file_get_normal(req, cancel->fd);
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if (!req->file) {
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ret = -EBADF;
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goto done;
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}
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cd.file = req->file;
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}
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ret = __io_async_cancel(&cd, req, issue_flags);
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done:
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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 IOU_OK;
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}
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static int io_files_update_prep(struct io_kiocb *req,
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const struct io_uring_sqe *sqe)
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{
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@ -157,7 +157,6 @@ void io_req_task_complete(struct io_kiocb *req, bool *locked);
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void io_req_task_queue_fail(struct io_kiocb *req, int ret);
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void io_req_task_submit(struct io_kiocb *req, bool *locked);
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void tctx_task_work(struct callback_head *cb);
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int io_try_cancel(struct io_kiocb *req, struct io_cancel_data *cd);
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__cold void io_uring_cancel_generic(bool cancel_all, struct io_sq_data *sqd);
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int io_uring_alloc_task_context(struct task_struct *task,
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struct io_ring_ctx *ctx);
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@ -11,6 +11,7 @@
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#include "io_uring_types.h"
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#include "io_uring.h"
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#include "refs.h"
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#include "cancel.h"
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#include "timeout.h"
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struct io_timeout {
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