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Merge branch 'for-6.2/io_uring' into for-6.2/io_uring-next

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* for-6.2/io_uring: (41 commits)
  io_uring: keep unlock_post inlined in hot path
  io_uring: don't use complete_post in kbuf
  io_uring: spelling fix
  io_uring: remove io_req_complete_post_tw
  io_uring: allow multishot polled reqs to defer completion
  io_uring: remove overflow param from io_post_aux_cqe
  io_uring: add lockdep assertion in io_fill_cqe_aux
  io_uring: make io_fill_cqe_aux static
  io_uring: add io_aux_cqe which allows deferred completion
  io_uring: allow defer completion for aux posted cqes
  io_uring: defer all io_req_complete_failed
  io_uring: always lock in io_apoll_task_func
  io_uring: remove iopoll spinlock
  io_uring: iopoll protect complete_post
  io_uring: inline __io_req_complete_put()
  io_uring: remove io_req_tw_post_queue
  io_uring: use io_req_task_complete() in timeout
  io_uring: hold locks for io_req_complete_failed
  io_uring: add completion locking for iopoll
  io_uring: kill io_cqring_ev_posted() and __io_cq_unlock_post()
  ...
This commit is contained in:
Jens Axboe 2022-11-29 12:08:37 -07:00
commit b2cf789f6c
18 changed files with 355 additions and 207 deletions
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37
fs/eventfd.c
View File

@ -43,21 +43,7 @@ struct eventfd_ctx {
int id;
};
/**
* eventfd_signal - Adds @n to the eventfd counter.
* @ctx: [in] Pointer to the eventfd context.
* @n: [in] Value of the counter to be added to the eventfd internal counter.
* The value cannot be negative.
*
* This function is supposed to be called by the kernel in paths that do not
* allow sleeping. In this function we allow the counter to reach the ULLONG_MAX
* value, and we signal this as overflow condition by returning a EPOLLERR
* to poll(2).
*
* Returns the amount by which the counter was incremented. This will be less
* than @n if the counter has overflowed.
*/
__u64 eventfd_signal(struct eventfd_ctx *ctx, __u64 n)
__u64 eventfd_signal_mask(struct eventfd_ctx *ctx, __u64 n, unsigned mask)
{
unsigned long flags;
@ -78,12 +64,31 @@ __u64 eventfd_signal(struct eventfd_ctx *ctx, __u64 n)
n = ULLONG_MAX - ctx->count;
ctx->count += n;
if (waitqueue_active(&ctx->wqh))
wake_up_locked_poll(&ctx->wqh, EPOLLIN);
wake_up_locked_poll(&ctx->wqh, EPOLLIN | mask);
current->in_eventfd = 0;
spin_unlock_irqrestore(&ctx->wqh.lock, flags);
return n;
}
/**
* eventfd_signal - Adds @n to the eventfd counter.
* @ctx: [in] Pointer to the eventfd context.
* @n: [in] Value of the counter to be added to the eventfd internal counter.
* The value cannot be negative.
*
* This function is supposed to be called by the kernel in paths that do not
* allow sleeping. In this function we allow the counter to reach the ULLONG_MAX
* value, and we signal this as overflow condition by returning a EPOLLERR
* to poll(2).
*
* Returns the amount by which the counter was incremented. This will be less
* than @n if the counter has overflowed.
*/
__u64 eventfd_signal(struct eventfd_ctx *ctx, __u64 n)
{
return eventfd_signal_mask(ctx, n, 0);
}
EXPORT_SYMBOL_GPL(eventfd_signal);
static void eventfd_free_ctx(struct eventfd_ctx *ctx)

18
fs/eventpoll.c
View File

@ -491,7 +491,8 @@ static inline void ep_set_busy_poll_napi_id(struct epitem *epi)
*/
#ifdef CONFIG_DEBUG_LOCK_ALLOC
static void ep_poll_safewake(struct eventpoll *ep, struct epitem *epi)
static void ep_poll_safewake(struct eventpoll *ep, struct epitem *epi,
unsigned pollflags)
{
struct eventpoll *ep_src;
unsigned long flags;
@ -522,16 +523,17 @@ static void ep_poll_safewake(struct eventpoll *ep, struct epitem *epi)
}
spin_lock_irqsave_nested(&ep->poll_wait.lock, flags, nests);
ep->nests = nests + 1;
wake_up_locked_poll(&ep->poll_wait, EPOLLIN);
wake_up_locked_poll(&ep->poll_wait, EPOLLIN | pollflags);
ep->nests = 0;
spin_unlock_irqrestore(&ep->poll_wait.lock, flags);
}
#else
static void ep_poll_safewake(struct eventpoll *ep, struct epitem *epi)
static void ep_poll_safewake(struct eventpoll *ep, struct epitem *epi,
unsigned pollflags)
{
wake_up_poll(&ep->poll_wait, EPOLLIN);
wake_up_poll(&ep->poll_wait, EPOLLIN | pollflags);
}
#endif
@ -742,7 +744,7 @@ static void ep_free(struct eventpoll *ep)
/* We need to release all tasks waiting for these file */
if (waitqueue_active(&ep->poll_wait))
ep_poll_safewake(ep, NULL);
ep_poll_safewake(ep, NULL, 0);
/*
* We need to lock this because we could be hit by
@ -1208,7 +1210,7 @@ static int ep_poll_callback(wait_queue_entry_t *wait, unsigned mode, int sync, v
/* We have to call this outside the lock */
if (pwake)
ep_poll_safewake(ep, epi);
ep_poll_safewake(ep, epi, pollflags & EPOLL_URING_WAKE);
if (!(epi->event.events & EPOLLEXCLUSIVE))
ewake = 1;
@ -1553,7 +1555,7 @@ static int ep_insert(struct eventpoll *ep, const struct epoll_event *event,
/* We have to call this outside the lock */
if (pwake)
ep_poll_safewake(ep, NULL);
ep_poll_safewake(ep, NULL, 0);
return 0;
}
@ -1629,7 +1631,7 @@ static int ep_modify(struct eventpoll *ep, struct epitem *epi,
/* We have to call this outside the lock */
if (pwake)
ep_poll_safewake(ep, NULL);
ep_poll_safewake(ep, NULL, 0);
return 0;
}

7
include/linux/eventfd.h
View File

@ -40,6 +40,7 @@ struct file *eventfd_fget(int fd);
struct eventfd_ctx *eventfd_ctx_fdget(int fd);
struct eventfd_ctx *eventfd_ctx_fileget(struct file *file);
__u64 eventfd_signal(struct eventfd_ctx *ctx, __u64 n);
__u64 eventfd_signal_mask(struct eventfd_ctx *ctx, __u64 n, unsigned mask);
int eventfd_ctx_remove_wait_queue(struct eventfd_ctx *ctx, wait_queue_entry_t *wait,
__u64 *cnt);
void eventfd_ctx_do_read(struct eventfd_ctx *ctx, __u64 *cnt);
@ -66,6 +67,12 @@ static inline int eventfd_signal(struct eventfd_ctx *ctx, int n)
return -ENOSYS;
}
static inline int eventfd_signal_mask(struct eventfd_ctx *ctx, __u64 n,
unsigned mask)
{
return -ENOSYS;
}
static inline void eventfd_ctx_put(struct eventfd_ctx *ctx)
{

2
include/linux/io_uring_types.h
View File

@ -174,7 +174,9 @@ struct io_submit_state {
bool plug_started;
bool need_plug;
unsigned short submit_nr;
unsigned int cqes_count;
struct blk_plug plug;
struct io_uring_cqe cqes[16];
};
struct io_ev_fd {

6
include/uapi/linux/eventpoll.h
View File

@ -41,6 +41,12 @@
#define EPOLLMSG (__force __poll_t)0x00000400
#define EPOLLRDHUP (__force __poll_t)0x00002000
/*
* Internal flag - wakeup generated by io_uring, used to detect recursion back
* into the io_uring poll handler.
*/
#define EPOLL_URING_WAKE ((__force __poll_t)(1U << 27))
/* Set exclusive wakeup mode for the target file descriptor */
#define EPOLLEXCLUSIVE ((__force __poll_t)(1U << 28))

18
include/uapi/linux/io_uring.h
View File

@ -296,10 +296,28 @@ enum io_uring_op {
*
* IORING_RECVSEND_FIXED_BUF Use registered buffers, the index is stored in
* the buf_index field.
*
* IORING_SEND_ZC_REPORT_USAGE
* If set, SEND[MSG]_ZC should report
* the zerocopy usage in cqe.res
* for the IORING_CQE_F_NOTIF cqe.
* 0 is reported if zerocopy was actually possible.
* IORING_NOTIF_USAGE_ZC_COPIED if data was copied
* (at least partially).
*/
#define IORING_RECVSEND_POLL_FIRST (1U << 0)
#define IORING_RECV_MULTISHOT (1U << 1)
#define IORING_RECVSEND_FIXED_BUF (1U << 2)
#define IORING_SEND_ZC_REPORT_USAGE (1U << 3)
/*
* cqe.res for IORING_CQE_F_NOTIF if
* IORING_SEND_ZC_REPORT_USAGE was requested
*
* It should be treated as a flag, all other
* bits of cqe.res should be treated as reserved!
*/
#define IORING_NOTIF_USAGE_ZC_COPIED (1U << 31)
/*
* accept flags stored in sqe->ioprio

223
io_uring/io_uring.c
View File

@ -167,7 +167,8 @@ EXPORT_SYMBOL(io_uring_get_socket);
static inline void io_submit_flush_completions(struct io_ring_ctx *ctx)
{
if (!wq_list_empty(&ctx->submit_state.compl_reqs))
if (!wq_list_empty(&ctx->submit_state.compl_reqs) ||
ctx->submit_state.cqes_count)
__io_submit_flush_completions(ctx);
}
@ -495,7 +496,7 @@ static void io_eventfd_ops(struct rcu_head *rcu)
int ops = atomic_xchg(&ev_fd->ops, 0);
if (ops & BIT(IO_EVENTFD_OP_SIGNAL_BIT))
eventfd_signal(ev_fd->cq_ev_fd, 1);
eventfd_signal_mask(ev_fd->cq_ev_fd, 1, EPOLL_URING_WAKE);
/* IO_EVENTFD_OP_FREE_BIT may not be set here depending on callback
* ordering in a race but if references are 0 we know we have to free
@ -531,7 +532,7 @@ static void io_eventfd_signal(struct io_ring_ctx *ctx)
goto out;
if (likely(eventfd_signal_allowed())) {
eventfd_signal(ev_fd->cq_ev_fd, 1);
eventfd_signal_mask(ev_fd->cq_ev_fd, 1, EPOLL_URING_WAKE);
} else {
atomic_inc(&ev_fd->refs);
if (!atomic_fetch_or(BIT(IO_EVENTFD_OP_SIGNAL_BIT), &ev_fd->ops))
@ -581,23 +582,21 @@ void __io_commit_cqring_flush(struct io_ring_ctx *ctx)
io_eventfd_flush_signal(ctx);
}
static inline void io_cqring_ev_posted(struct io_ring_ctx *ctx)
{
io_commit_cqring_flush(ctx);
io_cqring_wake(ctx);
}
static inline void __io_cq_unlock_post(struct io_ring_ctx *ctx)
/* keep it inlined for io_submit_flush_completions() */
static inline void io_cq_unlock_post_inline(struct io_ring_ctx *ctx)
__releases(ctx->completion_lock)
{
io_commit_cqring(ctx);
spin_unlock(&ctx->completion_lock);
io_cqring_ev_posted(ctx);
io_commit_cqring_flush(ctx);
io_cqring_wake(ctx);
}
void io_cq_unlock_post(struct io_ring_ctx *ctx)
__releases(ctx->completion_lock)
{
__io_cq_unlock_post(ctx);
io_cq_unlock_post_inline(ctx);
}
/* Returns true if there are no backlogged entries after the flush */
@ -778,11 +777,13 @@ struct io_uring_cqe *__io_get_cqe(struct io_ring_ctx *ctx, bool overflow)
return &rings->cqes[off];
}
bool io_fill_cqe_aux(struct io_ring_ctx *ctx, u64 user_data, s32 res, u32 cflags,
bool allow_overflow)
static bool io_fill_cqe_aux(struct io_ring_ctx *ctx, u64 user_data, s32 res, u32 cflags,
bool allow_overflow)
{
struct io_uring_cqe *cqe;
lockdep_assert_held(&ctx->completion_lock);
ctx->cq_extra++;
/*
@ -811,9 +812,23 @@ bool io_fill_cqe_aux(struct io_ring_ctx *ctx, u64 user_data, s32 res, u32 cflags
return false;
}
bool io_post_aux_cqe(struct io_ring_ctx *ctx,
u64 user_data, s32 res, u32 cflags,
bool allow_overflow)
static void __io_flush_post_cqes(struct io_ring_ctx *ctx)
__must_hold(&ctx->uring_lock)
{
struct io_submit_state *state = &ctx->submit_state;
unsigned int i;
lockdep_assert_held(&ctx->uring_lock);
for (i = 0; i < state->cqes_count; i++) {
struct io_uring_cqe *cqe = &state->cqes[i];
io_fill_cqe_aux(ctx, cqe->user_data, cqe->res, cqe->flags, true);
}
state->cqes_count = 0;
}
static bool __io_post_aux_cqe(struct io_ring_ctx *ctx, u64 user_data, s32 res, u32 cflags,
bool allow_overflow)
{
bool filled;
@ -823,15 +838,58 @@ bool io_post_aux_cqe(struct io_ring_ctx *ctx,
return filled;
}
static void __io_req_complete_put(struct io_kiocb *req)
bool io_post_aux_cqe(struct io_ring_ctx *ctx, u64 user_data, s32 res, u32 cflags)
{
return __io_post_aux_cqe(ctx, user_data, res, cflags, true);
}
bool io_aux_cqe(struct io_ring_ctx *ctx, bool defer, u64 user_data, s32 res, u32 cflags,
bool allow_overflow)
{
struct io_uring_cqe *cqe;
unsigned int length;
if (!defer)
return __io_post_aux_cqe(ctx, user_data, res, cflags, allow_overflow);
length = ARRAY_SIZE(ctx->submit_state.cqes);
lockdep_assert_held(&ctx->uring_lock);
if (ctx->submit_state.cqes_count == length) {
io_cq_lock(ctx);
__io_flush_post_cqes(ctx);
/* no need to flush - flush is deferred */
spin_unlock(&ctx->completion_lock);
}
/* For defered completions this is not as strict as it is otherwise,
* however it's main job is to prevent unbounded posted completions,
* and in that it works just as well.
*/
if (!allow_overflow && test_bit(IO_CHECK_CQ_OVERFLOW_BIT, &ctx->check_cq))
return false;
cqe = &ctx->submit_state.cqes[ctx->submit_state.cqes_count++];
cqe->user_data = user_data;
cqe->res = res;
cqe->flags = cflags;
return true;
}
static void __io_req_complete_post(struct io_kiocb *req)
{
struct io_ring_ctx *ctx = req->ctx;
io_cq_lock(ctx);
if (!(req->flags & REQ_F_CQE_SKIP))
__io_fill_cqe_req(ctx, req);
/*
* If we're the last reference to this request, add to our locked
* free_list cache.
*/
if (req_ref_put_and_test(req)) {
struct io_ring_ctx *ctx = req->ctx;
if (req->flags & IO_REQ_LINK_FLAGS) {
if (req->flags & IO_DISARM_MASK)
io_disarm_next(req);
@ -852,38 +910,35 @@ static void __io_req_complete_put(struct io_kiocb *req)
wq_list_add_head(&req->comp_list, &ctx->locked_free_list);
ctx->locked_free_nr++;
}
}
void __io_req_complete_post(struct io_kiocb *req)
{
if (!(req->flags & REQ_F_CQE_SKIP))
__io_fill_cqe_req(req->ctx, req);
__io_req_complete_put(req);
}
void io_req_complete_post(struct io_kiocb *req)
{
struct io_ring_ctx *ctx = req->ctx;
io_cq_lock(ctx);
__io_req_complete_post(req);
io_cq_unlock_post(ctx);
}
inline void __io_req_complete(struct io_kiocb *req, unsigned issue_flags)
void io_req_complete_post(struct io_kiocb *req, unsigned issue_flags)
{
io_req_complete_post(req);
if (!(issue_flags & IO_URING_F_UNLOCKED) ||
!(req->ctx->flags & IORING_SETUP_IOPOLL)) {
__io_req_complete_post(req);
} else {
struct io_ring_ctx *ctx = req->ctx;
mutex_lock(&ctx->uring_lock);
__io_req_complete_post(req);
mutex_unlock(&ctx->uring_lock);
}
}
void io_req_complete_failed(struct io_kiocb *req, s32 res)
void io_req_defer_failed(struct io_kiocb *req, s32 res)
__must_hold(&ctx->uring_lock)
{
const struct io_op_def *def = &io_op_defs[req->opcode];
lockdep_assert_held(&req->ctx->uring_lock);
req_set_fail(req);
io_req_set_res(req, res, io_put_kbuf(req, IO_URING_F_UNLOCKED));
if (def->fail)
def->fail(req);
io_req_complete_post(req);
io_req_complete_defer(req);
}
/*
@ -1105,6 +1160,20 @@ void tctx_task_work(struct callback_head *cb)
trace_io_uring_task_work_run(tctx, count, loops);
}
static __cold void io_fallback_tw(struct io_uring_task *tctx)
{
struct llist_node *node = llist_del_all(&tctx->task_list);
struct io_kiocb *req;
while (node) {
req = container_of(node, struct io_kiocb, io_task_work.node);
node = node->next;
if (llist_add(&req->io_task_work.node,
&req->ctx->fallback_llist))
schedule_delayed_work(&req->ctx->fallback_work, 1);
}
}
static void io_req_local_work_add(struct io_kiocb *req)
{
struct io_ring_ctx *ctx = req->ctx;
@ -1127,11 +1196,10 @@ static void io_req_local_work_add(struct io_kiocb *req)
__io_cqring_wake(ctx);
}
static inline void __io_req_task_work_add(struct io_kiocb *req, bool allow_local)
void __io_req_task_work_add(struct io_kiocb *req, bool allow_local)
{
struct io_uring_task *tctx = req->task->io_uring;
struct io_ring_ctx *ctx = req->ctx;
struct llist_node *node;
if (allow_local && ctx->flags & IORING_SETUP_DEFER_TASKRUN) {
io_req_local_work_add(req);
@ -1148,20 +1216,7 @@ static inline void __io_req_task_work_add(struct io_kiocb *req, bool allow_local
if (likely(!task_work_add(req->task, &tctx->task_work, ctx->notify_method)))
return;
node = llist_del_all(&tctx->task_list);
while (node) {
req = container_of(node, struct io_kiocb, io_task_work.node);
node = node->next;
if (llist_add(&req->io_task_work.node,
&req->ctx->fallback_llist))
schedule_delayed_work(&req->ctx->fallback_work, 1);
}
}
void io_req_task_work_add(struct io_kiocb *req)
{
__io_req_task_work_add(req, true);
io_fallback_tw(tctx);
}
static void __cold io_move_task_work_from_local(struct io_ring_ctx *ctx)
@ -1237,23 +1292,10 @@ int io_run_local_work(struct io_ring_ctx *ctx)
return ret;
}
static void io_req_tw_post(struct io_kiocb *req, bool *locked)
{
io_req_complete_post(req);
}
void io_req_tw_post_queue(struct io_kiocb *req, s32 res, u32 cflags)
{
io_req_set_res(req, res, cflags);
req->io_task_work.func = io_req_tw_post;
io_req_task_work_add(req);
}
static void io_req_task_cancel(struct io_kiocb *req, bool *locked)
{
/* not needed for normal modes, but SQPOLL depends on it */
io_tw_lock(req->ctx, locked);
io_req_complete_failed(req, req->cqe.res);
io_req_defer_failed(req, req->cqe.res);
}
void io_req_task_submit(struct io_kiocb *req, bool *locked)
@ -1263,7 +1305,7 @@ void io_req_task_submit(struct io_kiocb *req, bool *locked)
if (likely(!(req->task->flags & PF_EXITING)))
io_queue_sqe(req);
else
io_req_complete_failed(req, -EFAULT);
io_req_defer_failed(req, -EFAULT);
}
void io_req_task_queue_fail(struct io_kiocb *req, int ret)
@ -1344,6 +1386,9 @@ static void __io_submit_flush_completions(struct io_ring_ctx *ctx)
struct io_submit_state *state = &ctx->submit_state;
io_cq_lock(ctx);
/* must come first to preserve CQE ordering in failure cases */
if (state->cqes_count)
__io_flush_post_cqes(ctx);
wq_list_for_each(node, prev, &state->compl_reqs) {
struct io_kiocb *req = container_of(node, struct io_kiocb,
comp_list);
@ -1351,10 +1396,12 @@ static void __io_submit_flush_completions(struct io_ring_ctx *ctx)
if (!(req->flags & REQ_F_CQE_SKIP))
__io_fill_cqe_req(ctx, req);
}
__io_cq_unlock_post(ctx);
io_cq_unlock_post_inline(ctx);
io_free_batch_list(ctx, state->compl_reqs.first);
INIT_WQ_LIST(&state->compl_reqs);
if (!wq_list_empty(&ctx->submit_state.compl_reqs)) {
io_free_batch_list(ctx, state->compl_reqs.first);
INIT_WQ_LIST(&state->compl_reqs);
}
}
/*
@ -1476,16 +1523,10 @@ static int io_iopoll_check(struct io_ring_ctx *ctx, long min)
void io_req_task_complete(struct io_kiocb *req, bool *locked)
{
if (req->flags & (REQ_F_BUFFER_SELECTED|REQ_F_BUFFER_RING)) {
unsigned issue_flags = *locked ? 0 : IO_URING_F_UNLOCKED;
req->cqe.flags |= io_put_kbuf(req, issue_flags);
}
if (*locked)
io_req_complete_defer(req);
else
io_req_complete_post(req);
io_req_complete_post(req, IO_URING_F_UNLOCKED);
}
/*
@ -1635,6 +1676,7 @@ static u32 io_get_sequence(struct io_kiocb *req)
}
static __cold void io_drain_req(struct io_kiocb *req)
__must_hold(&ctx->uring_lock)
{
struct io_ring_ctx *ctx = req->ctx;
struct io_defer_entry *de;
@ -1655,7 +1697,7 @@ static __cold void io_drain_req(struct io_kiocb *req)
ret = io_req_prep_async(req);
if (ret) {
fail:
io_req_complete_failed(req, ret);
io_req_defer_failed(req, ret);
return;
}
io_prep_async_link(req);
@ -1752,7 +1794,7 @@ static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags)
if (issue_flags & IO_URING_F_COMPLETE_DEFER)
io_req_complete_defer(req);
else
io_req_complete_post(req);
io_req_complete_post(req, issue_flags);
} else if (ret != IOU_ISSUE_SKIP_COMPLETE)
return ret;
@ -1768,7 +1810,8 @@ int io_poll_issue(struct io_kiocb *req, bool *locked)
io_tw_lock(req->ctx, locked);
if (unlikely(req->task->flags & PF_EXITING))
return -EFAULT;
return io_issue_sqe(req, IO_URING_F_NONBLOCK|IO_URING_F_MULTISHOT);
return io_issue_sqe(req, IO_URING_F_NONBLOCK|IO_URING_F_MULTISHOT|
IO_URING_F_COMPLETE_DEFER);
}
struct io_wq_work *io_wq_free_work(struct io_wq_work *work)
@ -1787,7 +1830,7 @@ void io_wq_submit_work(struct io_wq_work *work)
bool needs_poll = false;
int ret = 0, err = -ECANCELED;
/* one will be dropped by ->io_free_work() after returning to io-wq */
/* one will be dropped by ->io_wq_free_work() after returning to io-wq */
if (!(req->flags & REQ_F_REFCOUNT))
__io_req_set_refcount(req, 2);
else
@ -1885,7 +1928,7 @@ static void io_queue_async(struct io_kiocb *req, int ret)
struct io_kiocb *linked_timeout;
if (ret != -EAGAIN || (req->flags & REQ_F_NOWAIT)) {
io_req_complete_failed(req, ret);
io_req_defer_failed(req, ret);
return;
}
@ -1935,14 +1978,14 @@ static void io_queue_sqe_fallback(struct io_kiocb *req)
*/
req->flags &= ~REQ_F_HARDLINK;
req->flags |= REQ_F_LINK;
io_req_complete_failed(req, req->cqe.res);
io_req_defer_failed(req, req->cqe.res);
} else if (unlikely(req->ctx->drain_active)) {
io_drain_req(req);
} else {
int ret = io_req_prep_async(req);
if (unlikely(ret))
io_req_complete_failed(req, ret);
io_req_defer_failed(req, ret);
else
io_queue_iowq(req, NULL);
}
@ -2670,7 +2713,7 @@ static __poll_t io_uring_poll(struct file *file, poll_table *wait)
* lock(&ep->mtx);
*
* Users may get EPOLLIN meanwhile seeing nothing in cqring, this
* pushs them to do the flush.
* pushes them to do the flush.
*/
if (io_cqring_events(ctx) || io_has_work(ctx))
@ -2869,7 +2912,7 @@ static __cold bool io_cancel_defer_files(struct io_ring_ctx *ctx,
while (!list_empty(&list)) {
de = list_first_entry(&list, struct io_defer_entry, list);
list_del_init(&de->list);
io_req_complete_failed(de->req, -ECANCELED);
io_req_task_queue_fail(de->req, -ECANCELED);
kfree(de);
}
return true;
@ -4062,8 +4105,6 @@ SYSCALL_DEFINE4(io_uring_register, unsigned int, fd, unsigned int, opcode,
ctx = f.file->private_data;
io_run_task_work_ctx(ctx);
mutex_lock(&ctx->uring_lock);
ret = __io_uring_register(ctx, opcode, arg, nr_args);
mutex_unlock(&ctx->uring_lock);

43
io_uring/io_uring.h
View File

@ -4,6 +4,7 @@
#include <linux/errno.h>
#include <linux/lockdep.h>
#include <linux/io_uring_types.h>
#include <uapi/linux/eventpoll.h>
#include "io-wq.h"
#include "slist.h"
#include "filetable.h"
@ -29,14 +30,11 @@ bool io_req_cqe_overflow(struct io_kiocb *req);
int io_run_task_work_sig(struct io_ring_ctx *ctx);
int __io_run_local_work(struct io_ring_ctx *ctx, bool *locked);
int io_run_local_work(struct io_ring_ctx *ctx);
void io_req_complete_failed(struct io_kiocb *req, s32 res);
void __io_req_complete(struct io_kiocb *req, unsigned issue_flags);
void io_req_complete_post(struct io_kiocb *req);
void __io_req_complete_post(struct io_kiocb *req);
bool io_post_aux_cqe(struct io_ring_ctx *ctx, u64 user_data, s32 res, u32 cflags,
bool allow_overflow);
bool io_fill_cqe_aux(struct io_ring_ctx *ctx, u64 user_data, s32 res, u32 cflags,
bool allow_overflow);
void io_req_defer_failed(struct io_kiocb *req, s32 res);
void io_req_complete_post(struct io_kiocb *req, unsigned issue_flags);
bool io_post_aux_cqe(struct io_ring_ctx *ctx, u64 user_data, s32 res, u32 cflags);
bool io_aux_cqe(struct io_ring_ctx *ctx, bool defer, u64 user_data, s32 res, u32 cflags,
bool allow_overflow);
void __io_commit_cqring_flush(struct io_ring_ctx *ctx);
struct page **io_pin_pages(unsigned long ubuf, unsigned long len, int *npages);
@ -50,10 +48,9 @@ static inline bool io_req_ffs_set(struct io_kiocb *req)
return req->flags & REQ_F_FIXED_FILE;
}
void __io_req_task_work_add(struct io_kiocb *req, bool allow_local);
bool io_is_uring_fops(struct file *file);
bool io_alloc_async_data(struct io_kiocb *req);
void io_req_task_work_add(struct io_kiocb *req);
void io_req_tw_post_queue(struct io_kiocb *req, s32 res, u32 cflags);
void io_req_task_queue(struct io_kiocb *req);
void io_queue_iowq(struct io_kiocb *req, bool *dont_use);
void io_req_task_complete(struct io_kiocb *req, bool *locked);
@ -82,6 +79,11 @@ bool __io_alloc_req_refill(struct io_ring_ctx *ctx);
bool io_match_task_safe(struct io_kiocb *head, struct task_struct *task,
bool cancel_all);
static inline void io_req_task_work_add(struct io_kiocb *req)
{
__io_req_task_work_add(req, true);
}
#define io_for_each_link(pos, head) \
for (pos = (head); pos; pos = pos->link)
@ -207,12 +209,18 @@ static inline void io_commit_cqring(struct io_ring_ctx *ctx)
static inline void __io_cqring_wake(struct io_ring_ctx *ctx)
{
/*
* wake_up_all() may seem excessive, but io_wake_function() and
* io_should_wake() handle the termination of the loop and only
* wake as many waiters as we need to.
* Trigger waitqueue handler on all waiters on our waitqueue. This
* won't necessarily wake up all the tasks, io_should_wake() will make
* that decision.
*
* Pass in EPOLLIN|EPOLL_URING_WAKE as the poll wakeup key. The latter
* set in the mask so that if we recurse back into our own poll
* waitqueue handlers, we know we have a dependency between eventfd or
* epoll and should terminate multishot poll at that point.
*/
if (waitqueue_active(&ctx->cq_wait))
wake_up_all(&ctx->cq_wait);
__wake_up(&ctx->cq_wait, TASK_NORMAL, 0,
poll_to_key(EPOLL_URING_WAKE | EPOLLIN));
}
static inline void io_cqring_wake(struct io_ring_ctx *ctx)
@ -369,4 +377,11 @@ static inline bool io_allowed_run_tw(struct io_ring_ctx *ctx)
ctx->submitter_task == current);
}
static inline void io_req_queue_tw_complete(struct io_kiocb *req, s32 res)
{
io_req_set_res(req, res, 0);
req->io_task_work.func = io_req_task_complete;
io_req_task_work_add(req);
}
#endif

14
io_uring/kbuf.c
View File

@ -306,14 +306,11 @@ int io_remove_buffers(struct io_kiocb *req, unsigned int issue_flags)
if (!bl->buf_nr_pages)
ret = __io_remove_buffers(ctx, bl, p->nbufs);
}
io_ring_submit_unlock(ctx, issue_flags);
if (ret < 0)
req_set_fail(req);
/* complete before unlock, IOPOLL may need the lock */
io_req_set_res(req, ret, 0);
__io_req_complete(req, issue_flags);
io_ring_submit_unlock(ctx, issue_flags);
return IOU_ISSUE_SKIP_COMPLETE;
return IOU_OK;
}
int io_provide_buffers_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
@ -458,13 +455,12 @@ int io_provide_buffers(struct io_kiocb *req, unsigned int issue_flags)
ret = io_add_buffers(ctx, p, bl);
err:
io_ring_submit_unlock(ctx, issue_flags);
if (ret < 0)
req_set_fail(req);
/* complete before unlock, IOPOLL may need the lock */
io_req_set_res(req, ret, 0);
__io_req_complete(req, issue_flags);
io_ring_submit_unlock(ctx, issue_flags);
return IOU_ISSUE_SKIP_COMPLETE;
return IOU_OK;
}
int io_register_pbuf_ring(struct io_ring_ctx *ctx, void __user *arg)

4
io_uring/msg_ring.c
View File

@ -31,7 +31,7 @@ static int io_msg_ring_data(struct io_kiocb *req)
if (msg->src_fd || msg->dst_fd || msg->flags)
return -EINVAL;
if (io_post_aux_cqe(target_ctx, msg->user_data, msg->len, 0, true))
if (io_post_aux_cqe(target_ctx, msg->user_data, msg->len, 0))
return 0;
return -EOVERFLOW;
@ -116,7 +116,7 @@ static int io_msg_send_fd(struct io_kiocb *req, unsigned int issue_flags)
* completes with -EOVERFLOW, then the sender must ensure that a
* later IORING_OP_MSG_RING delivers the message.
*/
if (!io_post_aux_cqe(target_ctx, msg->user_data, msg->len, 0, true))
if (!io_post_aux_cqe(target_ctx, msg->user_data, msg->len, 0))
ret = -EOVERFLOW;
out_unlock:
io_double_unlock_ctx(ctx, target_ctx, issue_flags);

56
io_uring/net.c
View File

@ -125,13 +125,15 @@ static struct io_async_msghdr *io_msg_alloc_async(struct io_kiocb *req,
struct io_cache_entry *entry;
struct io_async_msghdr *hdr;
if (!(issue_flags & IO_URING_F_UNLOCKED) &&
(entry = io_alloc_cache_get(&ctx->netmsg_cache)) != NULL) {
hdr = container_of(entry, struct io_async_msghdr, cache);
hdr->free_iov = NULL;
req->flags |= REQ_F_ASYNC_DATA;
req->async_data = hdr;
return hdr;
if (!(issue_flags & IO_URING_F_UNLOCKED)) {
entry = io_alloc_cache_get(&ctx->netmsg_cache);
if (entry) {
hdr = container_of(entry, struct io_async_msghdr, cache);
hdr->free_iov = NULL;
req->flags |= REQ_F_ASYNC_DATA;
req->async_data = hdr;
return hdr;
}
}
if (!io_alloc_async_data(req)) {
@ -599,16 +601,12 @@ static inline bool io_recv_finish(struct io_kiocb *req, int *ret,
}
if (!mshot_finished) {
if (io_post_aux_cqe(req->ctx, req->cqe.user_data, *ret,
cflags | IORING_CQE_F_MORE, false)) {
if (io_aux_cqe(req->ctx, issue_flags & IO_URING_F_COMPLETE_DEFER,
req->cqe.user_data, *ret, cflags | IORING_CQE_F_MORE, true)) {
io_recv_prep_retry(req);
return false;
}
/*
* Otherwise stop multishot but use the current result.
* Probably will end up going into overflow, but this means
* we cannot trust the ordering anymore
*/
/* Otherwise stop multishot but use the current result. */
}
io_req_set_res(req, *ret, cflags);
@ -923,6 +921,9 @@ void io_send_zc_cleanup(struct io_kiocb *req)
}
}
#define IO_ZC_FLAGS_COMMON (IORING_RECVSEND_POLL_FIRST | IORING_RECVSEND_FIXED_BUF)
#define IO_ZC_FLAGS_VALID (IO_ZC_FLAGS_COMMON | IORING_SEND_ZC_REPORT_USAGE)
int io_send_zc_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
struct io_sr_msg *zc = io_kiocb_to_cmd(req, struct io_sr_msg);
@ -935,10 +936,6 @@ int io_send_zc_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
if (req->flags & REQ_F_CQE_SKIP)
return -EINVAL;
zc->flags = READ_ONCE(sqe->ioprio);
if (zc->flags & ~(IORING_RECVSEND_POLL_FIRST |
IORING_RECVSEND_FIXED_BUF))
return -EINVAL;
notif = zc->notif = io_alloc_notif(ctx);
if (!notif)
return -ENOMEM;
@ -946,6 +943,17 @@ int io_send_zc_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
notif->cqe.res = 0;
notif->cqe.flags = IORING_CQE_F_NOTIF;
req->flags |= REQ_F_NEED_CLEANUP;
zc->flags = READ_ONCE(sqe->ioprio);
if (unlikely(zc->flags & ~IO_ZC_FLAGS_COMMON)) {
if (zc->flags & ~IO_ZC_FLAGS_VALID)
return -EINVAL;
if (zc->flags & IORING_SEND_ZC_REPORT_USAGE) {
io_notif_set_extended(notif);
io_notif_to_data(notif)->zc_report = true;
}
}
if (zc->flags & IORING_RECVSEND_FIXED_BUF) {
unsigned idx = READ_ONCE(sqe->buf_index);
@ -1087,6 +1095,7 @@ int io_send_zc(struct io_kiocb *req, unsigned int issue_flags)
return ret;
msg.sg_from_iter = io_sg_from_iter;
} else {
io_notif_set_extended(zc->notif);
ret = import_single_range(WRITE, zc->buf, zc->len, &iov,
&msg.msg_iter);
if (unlikely(ret))
@ -1148,6 +1157,8 @@ int io_sendmsg_zc(struct io_kiocb *req, unsigned int issue_flags)
unsigned flags;
int ret, min_ret = 0;
io_notif_set_extended(sr->notif);
sock = sock_from_file(req->file);
if (unlikely(!sock))
return -ENOTSOCK;
@ -1307,12 +1318,13 @@ int io_accept(struct io_kiocb *req, unsigned int issue_flags)
return IOU_OK;
}
if (ret >= 0 &&
io_post_aux_cqe(ctx, req->cqe.user_data, ret, IORING_CQE_F_MORE, false))
if (ret < 0)
return ret;
if (io_aux_cqe(ctx, issue_flags & IO_URING_F_COMPLETE_DEFER,
req->cqe.user_data, ret, IORING_CQE_F_MORE, true))
goto retry;
io_req_set_res(req, ret, 0);
return (issue_flags & IO_URING_F_MULTISHOT) ? IOU_STOP_MULTISHOT : IOU_OK;
return -ECANCELED;
}
int io_socket_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)

57
io_uring/notif.c
View File

@ -9,11 +9,14 @@
#include "notif.h"
#include "rsrc.h"
static void __io_notif_complete_tw(struct io_kiocb *notif, bool *locked)
static void io_notif_complete_tw_ext(struct io_kiocb *notif, bool *locked)
{
struct io_notif_data *nd = io_notif_to_data(notif);
struct io_ring_ctx *ctx = notif->ctx;
if (nd->zc_report && (nd->zc_copied || !nd->zc_used))
notif->cqe.res |= IORING_NOTIF_USAGE_ZC_COPIED;
if (nd->account_pages && ctx->user) {
__io_unaccount_mem(ctx->user, nd->account_pages);
nd->account_pages = 0;
@ -21,16 +24,41 @@ static void __io_notif_complete_tw(struct io_kiocb *notif, bool *locked)
io_req_task_complete(notif, locked);
}
static void io_uring_tx_zerocopy_callback(struct sk_buff *skb,
struct ubuf_info *uarg,
bool success)
static void io_tx_ubuf_callback(struct sk_buff *skb, struct ubuf_info *uarg,
bool success)
{
struct io_notif_data *nd = container_of(uarg, struct io_notif_data, uarg);
struct io_kiocb *notif = cmd_to_io_kiocb(nd);
if (refcount_dec_and_test(&uarg->refcnt)) {
notif->io_task_work.func = __io_notif_complete_tw;
if (refcount_dec_and_test(&uarg->refcnt))
io_req_task_work_add(notif);
}
static void io_tx_ubuf_callback_ext(struct sk_buff *skb, struct ubuf_info *uarg,
bool success)
{
struct io_notif_data *nd = container_of(uarg, struct io_notif_data, uarg);
if (nd->zc_report) {
if (success && !nd->zc_used && skb)
WRITE_ONCE(nd->zc_used, true);
else if (!success && !nd->zc_copied)
WRITE_ONCE(nd->zc_copied, true);
}
io_tx_ubuf_callback(skb, uarg, success);
}
void io_notif_set_extended(struct io_kiocb *notif)
{
struct io_notif_data *nd = io_notif_to_data(notif);
if (nd->uarg.callback != io_tx_ubuf_callback_ext) {
nd->account_pages = 0;
nd->zc_report = false;
nd->zc_used = false;
nd->zc_copied = false;
nd->uarg.callback = io_tx_ubuf_callback_ext;
notif->io_task_work.func = io_notif_complete_tw_ext;
}
}
@ -49,24 +77,11 @@ struct io_kiocb *io_alloc_notif(struct io_ring_ctx *ctx)
notif->task = current;
io_get_task_refs(1);
notif->rsrc_node = NULL;
io_req_set_rsrc_node(notif, ctx, 0);
notif->io_task_work.func = io_req_task_complete;
nd = io_notif_to_data(notif);
nd->account_pages = 0;
nd->uarg.flags = SKBFL_ZEROCOPY_FRAG | SKBFL_DONT_ORPHAN;
nd->uarg.callback = io_uring_tx_zerocopy_callback;
nd->uarg.callback = io_tx_ubuf_callback;
refcount_set(&nd->uarg.refcnt, 1);
return notif;
}
void io_notif_flush(struct io_kiocb *notif)
__must_hold(&slot->notif->ctx->uring_lock)
{
struct io_notif_data *nd = io_notif_to_data(notif);
/* drop slot's master ref */
if (refcount_dec_and_test(&nd->uarg.refcnt)) {
notif->io_task_work.func = __io_notif_complete_tw;
io_req_task_work_add(notif);
}
}

15
io_uring/notif.h
View File

@ -13,16 +13,29 @@ struct io_notif_data {
struct file *file;
struct ubuf_info uarg;
unsigned long account_pages;
bool zc_report;
bool zc_used;
bool zc_copied;
};
void io_notif_flush(struct io_kiocb *notif);
struct io_kiocb *io_alloc_notif(struct io_ring_ctx *ctx);
void io_notif_set_extended(struct io_kiocb *notif);
static inline struct io_notif_data *io_notif_to_data(struct io_kiocb *notif)
{
return io_kiocb_to_cmd(notif, struct io_notif_data);
}
static inline void io_notif_flush(struct io_kiocb *notif)
__must_hold(&notif->ctx->uring_lock)
{
struct io_notif_data *nd = io_notif_to_data(notif);
/* drop slot's master ref */
if (refcount_dec_and_test(&nd->uarg.refcnt))
io_req_task_work_add(notif);
}
static inline int io_notif_account_mem(struct io_kiocb *notif, unsigned len)
{
struct io_ring_ctx *ctx = notif->ctx;

33
io_uring/poll.c
View File

@ -280,16 +280,14 @@ static int io_poll_check_events(struct io_kiocb *req, bool *locked)
continue;
if (req->apoll_events & EPOLLONESHOT)
return IOU_POLL_DONE;
if (io_is_uring_fops(req->file))
return IOU_POLL_DONE;
/* multishot, just fill a CQE and proceed */
if (!(req->flags & REQ_F_APOLL_MULTISHOT)) {
__poll_t mask = mangle_poll(req->cqe.res &
req->apoll_events);
if (!io_post_aux_cqe(ctx, req->cqe.user_data,
mask, IORING_CQE_F_MORE, false)) {
if (!io_aux_cqe(ctx, *locked, req->cqe.user_data,
mask, IORING_CQE_F_MORE, false)) {
io_req_set_res(req, mask, 0);
return IOU_POLL_REMOVE_POLL_USE_RES;
}
@ -345,26 +343,22 @@ static void io_apoll_task_func(struct io_kiocb *req, bool *locked)
if (ret == IOU_POLL_NO_ACTION)
return;
io_tw_lock(req->ctx, locked);
io_poll_remove_entries(req);
io_poll_tw_hash_eject(req, locked);
if (ret == IOU_POLL_REMOVE_POLL_USE_RES)
io_req_complete_post(req);
io_req_task_complete(req, locked);
else if (ret == IOU_POLL_DONE)
io_req_task_submit(req, locked);
else
io_req_complete_failed(req, ret);
io_req_defer_failed(req, ret);
}
static void __io_poll_execute(struct io_kiocb *req, int mask)
{
io_req_set_res(req, mask, 0);
/*
* This is useful for poll that is armed on behalf of another
* request, and where the wakeup path could be on a different
* CPU. We want to avoid pulling in req->apoll->events for that
* case.
*/
if (req->opcode == IORING_OP_POLL_ADD)
req->io_task_work.func = io_poll_task_func;
else
@ -429,6 +423,14 @@ static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync,
return 0;
if (io_poll_get_ownership(req)) {
/*
* If we trigger a multishot poll off our own wakeup path,
* disable multishot as there is a circular dependency between
* CQ posting and triggering the event.
*/
if (mask & EPOLL_URING_WAKE)
poll->events |= EPOLLONESHOT;
/* optional, saves extra locking for removal in tw handler */
if (mask && poll->events & EPOLLONESHOT) {
list_del_init(&poll->wait.entry);
@ -648,10 +650,13 @@ static struct async_poll *io_req_alloc_apoll(struct io_kiocb *req,
if (req->flags & REQ_F_POLLED) {
apoll = req->apoll;
kfree(apoll->double_poll);
} else if (!(issue_flags & IO_URING_F_UNLOCKED) &&
(entry = io_alloc_cache_get(&ctx->apoll_cache)) != NULL) {
} else if (!(issue_flags & IO_URING_F_UNLOCKED)) {
entry = io_alloc_cache_get(&ctx->apoll_cache);
if (entry == NULL)
goto alloc_apoll;
apoll = container_of(entry, struct async_poll, cache);
} else {
alloc_apoll:
apoll = kmalloc(sizeof(*apoll), GFP_ATOMIC);
if (unlikely(!apoll))
return NULL;

11
io_uring/rsrc.c
View File

@ -170,10 +170,10 @@ static void __io_rsrc_put_work(struct io_rsrc_node *ref_node)
if (prsrc->tag) {
if (ctx->flags & IORING_SETUP_IOPOLL) {
mutex_lock(&ctx->uring_lock);
io_post_aux_cqe(ctx, prsrc->tag, 0, 0, true);
io_post_aux_cqe(ctx, prsrc->tag, 0, 0);
mutex_unlock(&ctx->uring_lock);
} else {
io_post_aux_cqe(ctx, prsrc->tag, 0, 0, true);
io_post_aux_cqe(ctx, prsrc->tag, 0, 0);
}
}
@ -321,6 +321,11 @@ __cold static int io_rsrc_ref_quiesce(struct io_rsrc_data *data,
if (atomic_dec_and_test(&data->refs))
break;
mutex_unlock(&ctx->uring_lock);
ret = io_run_task_work_sig(ctx);
if (ret < 0)
goto reinit;
flush_delayed_work(&ctx->rsrc_put_work);
ret = wait_for_completion_interruptible(&data->done);
if (!ret) {
@ -336,12 +341,12 @@ __cold static int io_rsrc_ref_quiesce(struct io_rsrc_data *data,
}
}
reinit:
atomic_inc(&data->refs);
/* wait for all works potentially completing data->done */
flush_delayed_work(&ctx->rsrc_put_work);
reinit_completion(&data->done);
ret = io_run_task_work_sig(ctx);
mutex_lock(&ctx->uring_lock);
} while (ret >= 0);
data->quiesce = false;

6
io_uring/rw.c
View File

@ -286,6 +286,12 @@ static inline int io_fixup_rw_res(struct io_kiocb *req, long res)
static void io_req_rw_complete(struct io_kiocb *req, bool *locked)
{
io_req_io_end(req);
if (req->flags & (REQ_F_BUFFER_SELECTED|REQ_F_BUFFER_RING)) {
unsigned issue_flags = *locked ? 0 : IO_URING_F_UNLOCKED;
req->cqe.flags |= io_put_kbuf(req, issue_flags);
}
io_req_task_complete(req, locked);
}

10
io_uring/timeout.c
View File

@ -63,7 +63,7 @@ static bool io_kill_timeout(struct io_kiocb *req, int status)
atomic_set(&req->ctx->cq_timeouts,
atomic_read(&req->ctx->cq_timeouts) + 1);
list_del_init(&timeout->list);
io_req_tw_post_queue(req, status, 0);
io_req_queue_tw_complete(req, status);
return true;
}
return false;
@ -159,7 +159,7 @@ void io_disarm_next(struct io_kiocb *req)
req->flags &= ~REQ_F_ARM_LTIMEOUT;
if (link && link->opcode == IORING_OP_LINK_TIMEOUT) {
io_remove_next_linked(req);
io_req_tw_post_queue(link, -ECANCELED, 0);
io_req_queue_tw_complete(link, -ECANCELED);
}
} else if (req->flags & REQ_F_LINK_TIMEOUT) {
struct io_ring_ctx *ctx = req->ctx;
@ -168,7 +168,7 @@ void io_disarm_next(struct io_kiocb *req)
link = io_disarm_linked_timeout(req);
spin_unlock_irq(&ctx->timeout_lock);
if (link)
io_req_tw_post_queue(link, -ECANCELED, 0);
io_req_queue_tw_complete(link, -ECANCELED);
}
if (unlikely((req->flags & REQ_F_FAIL) &&
!(req->flags & REQ_F_HARDLINK)))
@ -282,11 +282,11 @@ static void io_req_task_link_timeout(struct io_kiocb *req, bool *locked)
ret = io_try_cancel(req->task->io_uring, &cd, issue_flags);
}
io_req_set_res(req, ret ?: -ETIME, 0);
io_req_complete_post(req);
io_req_task_complete(req, locked);
io_put_req(prev);
} else {
io_req_set_res(req, -ETIME, 0);
io_req_complete_post(req);
io_req_task_complete(req, locked);
}
}

2
io_uring/uring_cmd.c
View File

@ -56,7 +56,7 @@ void io_uring_cmd_done(struct io_uring_cmd *ioucmd, ssize_t ret, ssize_t res2)
/* order with io_iopoll_req_issued() checking ->iopoll_complete */
smp_store_release(&req->iopoll_completed, 1);
else
__io_req_complete(req, 0);
io_req_complete_post(req, 0);
}
EXPORT_SYMBOL_GPL(io_uring_cmd_done);