struct io_submit_state submit_state;
struct list_head timeout_list;
+ struct list_head ltimeout_list;
struct list_head cq_overflow_list;
struct xarray io_buffers;
struct xarray personalities;
struct hrtimer timer;
struct timespec64 ts;
enum hrtimer_mode mode;
+ u32 flags;
};
struct io_accept {
struct sockaddr __user *addr;
int __user *addr_len;
int flags;
+ u32 file_slot;
unsigned long nofile;
};
/* timeout update */
struct timespec64 ts;
u32 flags;
+ bool ltimeout;
};
struct io_rw {
static int io_install_fixed_file(struct io_kiocb *req, struct file *file,
unsigned int issue_flags, u32 slot_index);
+static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer);
static struct kmem_cache *req_cachep;
req->flags |= REQ_F_FAIL;
}
+static inline void req_fail_link_node(struct io_kiocb *req, int res)
+{
+ req_set_fail(req);
+ req->result = res;
+}
+
static void io_ring_ctx_ref_free(struct percpu_ref *ref)
{
struct io_ring_ctx *ctx = container_of(ref, struct io_ring_ctx, refs);
INIT_LIST_HEAD(&ctx->iopoll_list);
INIT_LIST_HEAD(&ctx->defer_list);
INIT_LIST_HEAD(&ctx->timeout_list);
+ INIT_LIST_HEAD(&ctx->ltimeout_list);
spin_lock_init(&ctx->rsrc_ref_lock);
INIT_LIST_HEAD(&ctx->rsrc_ref_list);
INIT_DELAYED_WORK(&ctx->rsrc_put_work, io_rsrc_put_work);
}
}
+static void io_task_refs_refill(struct io_uring_task *tctx)
+{
+ unsigned int refill = -tctx->cached_refs + IO_TCTX_REFS_CACHE_NR;
+
+ percpu_counter_add(&tctx->inflight, refill);
+ refcount_add(refill, ¤t->usage);
+ tctx->cached_refs += refill;
+}
+
+static inline void io_get_task_refs(int nr)
+{
+ struct io_uring_task *tctx = current->io_uring;
+
+ tctx->cached_refs -= nr;
+ if (unlikely(tctx->cached_refs < 0))
+ io_task_refs_refill(tctx);
+}
+
static bool io_cqring_event_overflow(struct io_ring_ctx *ctx, u64 user_data,
long res, unsigned int cflags)
{
io_remove_next_linked(req);
link->timeout.head = NULL;
if (hrtimer_try_to_cancel(&io->timer) != -1) {
+ list_del(&link->timeout.list);
io_cqring_fill_event(link->ctx, link->user_data,
-ECANCELED, 0);
io_put_req_deferred(link);
req->link = NULL;
while (link) {
+ long res = -ECANCELED;
+
+ if (link->flags & REQ_F_FAIL)
+ res = link->result;
+
nxt = link->link;
link->link = NULL;
trace_io_uring_fail_link(req, link);
- io_cqring_fill_event(link->ctx, link->user_data, -ECANCELED, 0);
+ io_cqring_fill_event(link->ctx, link->user_data, res, 0);
io_put_req_deferred(link);
link = nxt;
}
{
struct io_ring_ctx *ctx = req->ctx;
- /* ctx is guaranteed to stay alive while we hold uring_lock */
+ /* not needed for normal modes, but SQPOLL depends on it */
io_tw_lock(ctx, locked);
io_req_complete_failed(req, req->result);
}
{
struct io_ring_ctx *ctx = req->ctx;
- /* ctx stays valid until unlock, even if we drop all ours ctx->refs */
io_tw_lock(ctx, locked);
/* req->task == current here, checking PF_EXITING is safe */
if (likely(!(req->task->flags & PF_EXITING)))
!kiocb->ki_filp->f_op->iopoll)
return -EOPNOTSUPP;
- kiocb->ki_flags |= IOCB_HIPRI;
+ kiocb->ki_flags |= IOCB_HIPRI | IOCB_ALLOC_CACHE;
kiocb->ki_complete = io_complete_rw_iopoll;
req->iopoll_completed = 0;
} else {
if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
return -EINVAL;
- if (sqe->ioprio || sqe->len || sqe->buf_index || sqe->splice_fd_in)
+ if (sqe->ioprio || sqe->len || sqe->buf_index)
return -EINVAL;
accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr));
accept->flags = READ_ONCE(sqe->accept_flags);
accept->nofile = rlimit(RLIMIT_NOFILE);
+ accept->file_slot = READ_ONCE(sqe->file_index);
+ if (accept->file_slot && ((req->open.how.flags & O_CLOEXEC) ||
+ (accept->flags & SOCK_CLOEXEC)))
+ return -EINVAL;
if (accept->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
return -EINVAL;
if (SOCK_NONBLOCK != O_NONBLOCK && (accept->flags & SOCK_NONBLOCK))
struct io_accept *accept = &req->accept;
bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0;
+ bool fixed = !!accept->file_slot;
struct file *file;
int ret, fd;
if (req->file->f_flags & O_NONBLOCK)
req->flags |= REQ_F_NOWAIT;
- fd = __get_unused_fd_flags(accept->flags, accept->nofile);
- if (unlikely(fd < 0))
- return fd;
-
+ if (!fixed) {
+ fd = __get_unused_fd_flags(accept->flags, accept->nofile);
+ if (unlikely(fd < 0))
+ return fd;
+ }
file = do_accept(req->file, file_flags, accept->addr, accept->addr_len,
accept->flags);
if (IS_ERR(file)) {
+ if (!fixed)
+ put_unused_fd(fd);
ret = PTR_ERR(file);
if (ret == -EAGAIN && force_nonblock)
return -EAGAIN;
if (ret == -ERESTARTSYS)
ret = -EINTR;
req_set_fail(req);
- } else {
+ } else if (!fixed) {
fd_install(fd, file);
ret = fd;
+ } else {
+ ret = io_install_fixed_file(req, file, issue_flags,
+ accept->file_slot - 1);
}
__io_req_complete(req, issue_flags, ret, 0);
return 0;
return 0;
}
+static clockid_t io_timeout_get_clock(struct io_timeout_data *data)
+{
+ switch (data->flags & IORING_TIMEOUT_CLOCK_MASK) {
+ case IORING_TIMEOUT_BOOTTIME:
+ return CLOCK_BOOTTIME;
+ case IORING_TIMEOUT_REALTIME:
+ return CLOCK_REALTIME;
+ default:
+ /* can't happen, vetted at prep time */
+ WARN_ON_ONCE(1);
+ fallthrough;
+ case 0:
+ return CLOCK_MONOTONIC;
+ }
+}
+
+static int io_linked_timeout_update(struct io_ring_ctx *ctx, __u64 user_data,
+ struct timespec64 *ts, enum hrtimer_mode mode)
+ __must_hold(&ctx->timeout_lock)
+{
+ struct io_timeout_data *io;
+ struct io_kiocb *req;
+ bool found = false;
+
+ list_for_each_entry(req, &ctx->ltimeout_list, timeout.list) {
+ found = user_data == req->user_data;
+ if (found)
+ break;
+ }
+ if (!found)
+ return -ENOENT;
+
+ io = req->async_data;
+ if (hrtimer_try_to_cancel(&io->timer) == -1)
+ return -EALREADY;
+ hrtimer_init(&io->timer, io_timeout_get_clock(io), mode);
+ io->timer.function = io_link_timeout_fn;
+ hrtimer_start(&io->timer, timespec64_to_ktime(*ts), mode);
+ return 0;
+}
+
static int io_timeout_update(struct io_ring_ctx *ctx, __u64 user_data,
struct timespec64 *ts, enum hrtimer_mode mode)
__must_hold(&ctx->timeout_lock)
req->timeout.off = 0; /* noseq */
data = req->async_data;
list_add_tail(&req->timeout.list, &ctx->timeout_list);
- hrtimer_init(&data->timer, CLOCK_MONOTONIC, mode);
+ hrtimer_init(&data->timer, io_timeout_get_clock(data), mode);
data->timer.function = io_timeout_fn;
hrtimer_start(&data->timer, timespec64_to_ktime(*ts), mode);
return 0;
if (sqe->ioprio || sqe->buf_index || sqe->len || sqe->splice_fd_in)
return -EINVAL;
+ tr->ltimeout = false;
tr->addr = READ_ONCE(sqe->addr);
tr->flags = READ_ONCE(sqe->timeout_flags);
- if (tr->flags & IORING_TIMEOUT_UPDATE) {
- if (tr->flags & ~(IORING_TIMEOUT_UPDATE|IORING_TIMEOUT_ABS))
+ if (tr->flags & IORING_TIMEOUT_UPDATE_MASK) {
+ if (hweight32(tr->flags & IORING_TIMEOUT_CLOCK_MASK) > 1)
+ return -EINVAL;
+ if (tr->flags & IORING_LINK_TIMEOUT_UPDATE)
+ tr->ltimeout = true;
+ if (tr->flags & ~(IORING_TIMEOUT_UPDATE_MASK|IORING_TIMEOUT_ABS))
return -EINVAL;
if (get_timespec64(&tr->ts, u64_to_user_ptr(sqe->addr2)))
return -EFAULT;
spin_unlock_irq(&ctx->timeout_lock);
spin_unlock(&ctx->completion_lock);
} else {
+ enum hrtimer_mode mode = io_translate_timeout_mode(tr->flags);
+
spin_lock_irq(&ctx->timeout_lock);
- ret = io_timeout_update(ctx, tr->addr, &tr->ts,
- io_translate_timeout_mode(tr->flags));
+ if (tr->ltimeout)
+ ret = io_linked_timeout_update(ctx, tr->addr, &tr->ts, mode);
+ else
+ ret = io_timeout_update(ctx, tr->addr, &tr->ts, mode);
spin_unlock_irq(&ctx->timeout_lock);
}
if (off && is_timeout_link)
return -EINVAL;
flags = READ_ONCE(sqe->timeout_flags);
- if (flags & ~IORING_TIMEOUT_ABS)
+ if (flags & ~(IORING_TIMEOUT_ABS | IORING_TIMEOUT_CLOCK_MASK))
+ return -EINVAL;
+ /* more than one clock specified is invalid, obviously */
+ if (hweight32(flags & IORING_TIMEOUT_CLOCK_MASK) > 1)
return -EINVAL;
+ INIT_LIST_HEAD(&req->timeout.list);
req->timeout.off = off;
if (unlikely(off && !req->ctx->off_timeout_used))
req->ctx->off_timeout_used = true;
data = req->async_data;
data->req = req;
+ data->flags = flags;
if (get_timespec64(&data->ts, u64_to_user_ptr(sqe->addr)))
return -EFAULT;
data->mode = io_translate_timeout_mode(flags);
- hrtimer_init(&data->timer, CLOCK_MONOTONIC, data->mode);
+ hrtimer_init(&data->timer, io_timeout_get_clock(data), data->mode);
if (is_timeout_link) {
struct io_submit_link *link = &req->ctx->submit_state.link;
if (!req_ref_inc_not_zero(prev))
prev = NULL;
}
+ list_del(&req->timeout.list);
req->timeout.prev = prev;
spin_unlock_irqrestore(&ctx->timeout_lock, flags);
data->timer.function = io_link_timeout_fn;
hrtimer_start(&data->timer, timespec64_to_ktime(data->ts),
data->mode);
+ list_add_tail(&req->timeout.list, &ctx->ltimeout_list);
}
spin_unlock_irq(&ctx->timeout_lock);
/* drop submission reference */
if (unlikely(req->ctx->drain_active) && io_drain_req(req))
return;
- if (likely(!(req->flags & REQ_F_FORCE_ASYNC))) {
+ if (likely(!(req->flags & (REQ_F_FORCE_ASYNC | REQ_F_FAIL)))) {
__io_queue_sqe(req);
+ } else if (req->flags & REQ_F_FAIL) {
+ io_req_complete_failed(req, req->result);
} else {
int ret = io_req_prep_async(req);
ret = io_init_req(ctx, req, sqe);
if (unlikely(ret)) {
fail_req:
+ /* fail even hard links since we don't submit */
if (link->head) {
- /* fail even hard links since we don't submit */
- req_set_fail(link->head);
- io_req_complete_failed(link->head, -ECANCELED);
- link->head = NULL;
+ /*
+ * we can judge a link req is failed or cancelled by if
+ * REQ_F_FAIL is set, but the head is an exception since
+ * it may be set REQ_F_FAIL because of other req's failure
+ * so let's leverage req->result to distinguish if a head
+ * is set REQ_F_FAIL because of its failure or other req's
+ * failure so that we can set the correct ret code for it.
+ * init result here to avoid affecting the normal path.
+ */
+ if (!(link->head->flags & REQ_F_FAIL))
+ req_fail_link_node(link->head, -ECANCELED);
+ } else if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) {
+ /*
+ * the current req is a normal req, we should return
+ * error and thus break the submittion loop.
+ */
+ io_req_complete_failed(req, ret);
+ return ret;
}
- io_req_complete_failed(req, ret);
- return ret;
+ req_fail_link_node(req, ret);
+ } else {
+ ret = io_req_prep(req, sqe);
+ if (unlikely(ret))
+ goto fail_req;
}
- ret = io_req_prep(req, sqe);
- if (unlikely(ret))
- goto fail_req;
-
/* don't need @sqe from now on */
trace_io_uring_submit_sqe(ctx, req, req->opcode, req->user_data,
req->flags, true,
if (link->head) {
struct io_kiocb *head = link->head;
- ret = io_req_prep_async(req);
- if (unlikely(ret))
- goto fail_req;
+ if (!(req->flags & REQ_F_FAIL)) {
+ ret = io_req_prep_async(req);
+ if (unlikely(ret)) {
+ req_fail_link_node(req, ret);
+ if (!(head->flags & REQ_F_FAIL))
+ req_fail_link_node(head, -ECANCELED);
+ }
+ }
trace_io_uring_link(ctx, req, head);
link->last->link = req;
link->last = req;
static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr)
__must_hold(&ctx->uring_lock)
{
- struct io_uring_task *tctx;
int submitted = 0;
/* make sure SQ entry isn't read before tail */
nr = min3(nr, ctx->sq_entries, io_sqring_entries(ctx));
if (!percpu_ref_tryget_many(&ctx->refs, nr))
return -EAGAIN;
+ io_get_task_refs(nr);
- tctx = current->io_uring;
- tctx->cached_refs -= nr;
- if (unlikely(tctx->cached_refs < 0)) {
- unsigned int refill = -tctx->cached_refs + IO_TCTX_REFS_CACHE_NR;
-
- percpu_counter_add(&tctx->inflight, refill);
- refcount_add(refill, ¤t->usage);
- tctx->cached_refs += refill;
- }
io_submit_state_start(&ctx->submit_state, nr);
-
while (submitted < nr) {
const struct io_uring_sqe *sqe;
struct io_kiocb *req;
}
sqe = io_get_sqe(ctx);
if (unlikely(!sqe)) {
- kmem_cache_free(req_cachep, req);
+ list_add(&req->inflight_entry, &ctx->submit_state.free_list);
break;
}
/* will complete beyond this point, count as submitted */
sock_release(ctx->ring_sock);
}
#endif
+ WARN_ON_ONCE(!list_empty(&ctx->ltimeout_list));
io_mem_free(ctx->rings);
io_mem_free(ctx->sq_sqes);
return io_wq_cpu_affinity(tctx->io_wq, NULL);
}
+static int io_register_iowq_max_workers(struct io_ring_ctx *ctx,
+ void __user *arg)
+{
+ struct io_uring_task *tctx = current->io_uring;
+ __u32 new_count[2];
+ int i, ret;
+
+ if (!tctx || !tctx->io_wq)
+ return -EINVAL;
+ if (copy_from_user(new_count, arg, sizeof(new_count)))
+ return -EFAULT;
+ for (i = 0; i < ARRAY_SIZE(new_count); i++)
+ if (new_count[i] > INT_MAX)
+ return -EINVAL;
+
+ ret = io_wq_max_workers(tctx->io_wq, new_count);
+ if (ret)
+ return ret;
+
+ if (copy_to_user(arg, new_count, sizeof(new_count)))
+ return -EFAULT;
+
+ return 0;
+}
+
static bool io_register_op_must_quiesce(int op)
{
switch (op) {
case IORING_REGISTER_BUFFERS_UPDATE:
case IORING_REGISTER_IOWQ_AFF:
case IORING_UNREGISTER_IOWQ_AFF:
+ case IORING_REGISTER_IOWQ_MAX_WORKERS:
return false;
default:
return true;
break;
ret = io_unregister_iowq_aff(ctx);
break;
+ case IORING_REGISTER_IOWQ_MAX_WORKERS:
+ ret = -EINVAL;
+ if (!arg || nr_args != 2)
+ break;
+ ret = io_register_iowq_max_workers(ctx, arg);
+ break;
default:
ret = -EINVAL;
break;
sizeof(struct io_uring_rsrc_update));
BUILD_BUG_ON(sizeof(struct io_uring_rsrc_update) >
sizeof(struct io_uring_rsrc_update2));
+
+ /* ->buf_index is u16 */
+ BUILD_BUG_ON(IORING_MAX_REG_BUFFERS >= (1u << 16));
+
/* should fit into one byte */
BUILD_BUG_ON(SQE_VALID_FLAGS >= (1 << 8));
projects / linux-2.6-microblaze.git / blobdiff