sync.o advise.o filetable.o \
openclose.o uring_cmd.o epoll.o \
statx.o net.o msg_ring.o timeout.o \
- sqpoll.o fdinfo.o
+ sqpoll.o fdinfo.o tctx.o
obj-$(CONFIG_IO_WQ) += io-wq.o
#include "io_uring_types.h"
#include "io_uring.h"
#include "refs.h"
+#include "tctx.h"
#include "sqpoll.h"
#include "fdinfo.h"
#define BGID_ARRAY 64
-/*
- * Arbitrary limit, can be raised if need be
- */
-#define IO_RINGFD_REG_MAX 16
-
-struct io_uring_task {
- /* submission side */
- int cached_refs;
- struct xarray xa;
- struct wait_queue_head wait;
- const struct io_ring_ctx *last;
- struct io_wq *io_wq;
- struct percpu_counter inflight;
- atomic_t inflight_tracked;
- atomic_t in_idle;
-
- spinlock_t task_lock;
- struct io_wq_work_list task_list;
- struct io_wq_work_list prio_task_list;
- struct callback_head task_work;
- struct file **registered_rings;
- bool task_running;
-};
-
/*
* First field must be the file pointer in all the
* iocb unions! See also 'struct kiocb' in <linux/fs.h>
IO_CHECK_CQ_DROPPED_BIT,
};
-struct io_tctx_node {
- struct list_head ctx_node;
- struct task_struct *task;
- struct io_ring_ctx *ctx;
-};
-
struct io_defer_entry {
struct list_head list;
struct io_kiocb *req;
#define IO_DISARM_MASK (REQ_F_ARM_LTIMEOUT | REQ_F_LINK_TIMEOUT | REQ_F_FAIL)
#define IO_REQ_LINK_FLAGS (REQ_F_LINK | REQ_F_HARDLINK)
-static void io_uring_del_tctx_node(unsigned long index);
static void io_uring_try_cancel_requests(struct io_ring_ctx *ctx,
struct task_struct *task,
bool cancel_all);
} while (node);
}
-static void tctx_task_work(struct callback_head *cb)
+void tctx_task_work(struct callback_head *cb)
{
bool uring_locked = false;
struct io_ring_ctx *ctx = NULL;
return 0;
}
-static struct io_wq_work *io_wq_free_work(struct io_wq_work *work)
+struct io_wq_work *io_wq_free_work(struct io_wq_work *work)
{
struct io_kiocb *req = container_of(work, struct io_kiocb, work);
return req ? &req->work : NULL;
}
-static void io_wq_submit_work(struct io_wq_work *work)
+void io_wq_submit_work(struct io_wq_work *work)
{
struct io_kiocb *req = container_of(work, struct io_kiocb, work);
const struct io_op_def *def = &io_op_defs[req->opcode];
return done ? done : err;
}
-static struct io_wq *io_init_wq_offload(struct io_ring_ctx *ctx,
- struct task_struct *task)
-{
- struct io_wq_hash *hash;
- struct io_wq_data data;
- unsigned int concurrency;
-
- mutex_lock(&ctx->uring_lock);
- hash = ctx->hash_map;
- if (!hash) {
- hash = kzalloc(sizeof(*hash), GFP_KERNEL);
- if (!hash) {
- mutex_unlock(&ctx->uring_lock);
- return ERR_PTR(-ENOMEM);
- }
- refcount_set(&hash->refs, 1);
- init_waitqueue_head(&hash->wait);
- ctx->hash_map = hash;
- }
- mutex_unlock(&ctx->uring_lock);
-
- data.hash = hash;
- data.task = task;
- data.free_work = io_wq_free_work;
- data.do_work = io_wq_submit_work;
-
- /* Do QD, or 4 * CPUS, whatever is smallest */
- concurrency = min(ctx->sq_entries, 4 * num_online_cpus());
-
- return io_wq_create(concurrency, &data);
-}
-
-__cold int io_uring_alloc_task_context(struct task_struct *task,
- struct io_ring_ctx *ctx)
-{
- struct io_uring_task *tctx;
- int ret;
-
- tctx = kzalloc(sizeof(*tctx), GFP_KERNEL);
- if (unlikely(!tctx))
- return -ENOMEM;
-
- tctx->registered_rings = kcalloc(IO_RINGFD_REG_MAX,
- sizeof(struct file *), GFP_KERNEL);
- if (unlikely(!tctx->registered_rings)) {
- kfree(tctx);
- return -ENOMEM;
- }
-
- ret = percpu_counter_init(&tctx->inflight, 0, GFP_KERNEL);
- if (unlikely(ret)) {
- kfree(tctx->registered_rings);
- kfree(tctx);
- return ret;
- }
-
- tctx->io_wq = io_init_wq_offload(ctx, task);
- if (IS_ERR(tctx->io_wq)) {
- ret = PTR_ERR(tctx->io_wq);
- percpu_counter_destroy(&tctx->inflight);
- kfree(tctx->registered_rings);
- kfree(tctx);
- return ret;
- }
-
- xa_init(&tctx->xa);
- init_waitqueue_head(&tctx->wait);
- atomic_set(&tctx->in_idle, 0);
- atomic_set(&tctx->inflight_tracked, 0);
- task->io_uring = tctx;
- spin_lock_init(&tctx->task_lock);
- INIT_WQ_LIST(&tctx->task_list);
- INIT_WQ_LIST(&tctx->prio_task_list);
- init_task_work(&tctx->task_work, tctx_task_work);
- return 0;
-}
-
-void __io_uring_free(struct task_struct *tsk)
-{
- struct io_uring_task *tctx = tsk->io_uring;
-
- WARN_ON_ONCE(!xa_empty(&tctx->xa));
- WARN_ON_ONCE(tctx->io_wq);
- WARN_ON_ONCE(tctx->cached_refs);
-
- kfree(tctx->registered_rings);
- percpu_counter_destroy(&tctx->inflight);
- kfree(tctx);
- tsk->io_uring = NULL;
-}
-
static inline void __io_unaccount_mem(struct user_struct *user,
unsigned long nr_pages)
{
}
}
-static int __io_uring_add_tctx_node(struct io_ring_ctx *ctx)
-{
- struct io_uring_task *tctx = current->io_uring;
- struct io_tctx_node *node;
- int ret;
-
- if (unlikely(!tctx)) {
- ret = io_uring_alloc_task_context(current, ctx);
- if (unlikely(ret))
- return ret;
-
- tctx = current->io_uring;
- if (ctx->iowq_limits_set) {
- unsigned int limits[2] = { ctx->iowq_limits[0],
- ctx->iowq_limits[1], };
-
- ret = io_wq_max_workers(tctx->io_wq, limits);
- if (ret)
- return ret;
- }
- }
- if (!xa_load(&tctx->xa, (unsigned long)ctx)) {
- node = kmalloc(sizeof(*node), GFP_KERNEL);
- if (!node)
- return -ENOMEM;
- node->ctx = ctx;
- node->task = current;
-
- ret = xa_err(xa_store(&tctx->xa, (unsigned long)ctx,
- node, GFP_KERNEL));
- if (ret) {
- kfree(node);
- return ret;
- }
-
- mutex_lock(&ctx->uring_lock);
- list_add(&node->ctx_node, &ctx->tctx_list);
- mutex_unlock(&ctx->uring_lock);
- }
- tctx->last = ctx;
- return 0;
-}
-
-/*
- * Note that this task has used io_uring. We use it for cancelation purposes.
- */
-static inline int io_uring_add_tctx_node(struct io_ring_ctx *ctx)
-{
- struct io_uring_task *tctx = current->io_uring;
-
- if (likely(tctx && tctx->last == ctx))
- return 0;
- return __io_uring_add_tctx_node(ctx);
-}
-
-/*
- * Remove this io_uring_file -> task mapping.
- */
-static __cold void io_uring_del_tctx_node(unsigned long index)
-{
- struct io_uring_task *tctx = current->io_uring;
- struct io_tctx_node *node;
-
- if (!tctx)
- return;
- node = xa_erase(&tctx->xa, index);
- if (!node)
- return;
-
- WARN_ON_ONCE(current != node->task);
- WARN_ON_ONCE(list_empty(&node->ctx_node));
-
- mutex_lock(&node->ctx->uring_lock);
- list_del(&node->ctx_node);
- mutex_unlock(&node->ctx->uring_lock);
-
- if (tctx->last == node->ctx)
- tctx->last = NULL;
- kfree(node);
-}
-
-static __cold void io_uring_clean_tctx(struct io_uring_task *tctx)
-{
- struct io_wq *wq = tctx->io_wq;
- struct io_tctx_node *node;
- unsigned long index;
-
- xa_for_each(&tctx->xa, index, node) {
- io_uring_del_tctx_node(index);
- cond_resched();
- }
- if (wq) {
- /*
- * Must be after io_uring_del_tctx_node() (removes nodes under
- * uring_lock) to avoid race with io_uring_try_cancel_iowq().
- */
- io_wq_put_and_exit(wq);
- tctx->io_wq = NULL;
- }
-}
-
static s64 tctx_inflight(struct io_uring_task *tctx, bool tracked)
{
if (tracked)
io_uring_cancel_generic(cancel_all, NULL);
}
-void io_uring_unreg_ringfd(void)
-{
- struct io_uring_task *tctx = current->io_uring;
- int i;
-
- for (i = 0; i < IO_RINGFD_REG_MAX; i++) {
- if (tctx->registered_rings[i]) {
- fput(tctx->registered_rings[i]);
- tctx->registered_rings[i] = NULL;
- }
- }
-}
-
-static int io_ring_add_registered_fd(struct io_uring_task *tctx, int fd,
- int start, int end)
-{
- struct file *file;
- int offset;
-
- for (offset = start; offset < end; offset++) {
- offset = array_index_nospec(offset, IO_RINGFD_REG_MAX);
- if (tctx->registered_rings[offset])
- continue;
-
- file = fget(fd);
- if (!file) {
- return -EBADF;
- } else if (!io_is_uring_fops(file)) {
- fput(file);
- return -EOPNOTSUPP;
- }
- tctx->registered_rings[offset] = file;
- return offset;
- }
-
- return -EBUSY;
-}
-
-/*
- * Register a ring fd to avoid fdget/fdput for each io_uring_enter()
- * invocation. User passes in an array of struct io_uring_rsrc_update
- * with ->data set to the ring_fd, and ->offset given for the desired
- * index. If no index is desired, application may set ->offset == -1U
- * and we'll find an available index. Returns number of entries
- * successfully processed, or < 0 on error if none were processed.
- */
-static int io_ringfd_register(struct io_ring_ctx *ctx, void __user *__arg,
- unsigned nr_args)
-{
- struct io_uring_rsrc_update __user *arg = __arg;
- struct io_uring_rsrc_update reg;
- struct io_uring_task *tctx;
- int ret, i;
-
- if (!nr_args || nr_args > IO_RINGFD_REG_MAX)
- return -EINVAL;
-
- mutex_unlock(&ctx->uring_lock);
- ret = io_uring_add_tctx_node(ctx);
- mutex_lock(&ctx->uring_lock);
- if (ret)
- return ret;
-
- tctx = current->io_uring;
- for (i = 0; i < nr_args; i++) {
- int start, end;
-
- if (copy_from_user(®, &arg[i], sizeof(reg))) {
- ret = -EFAULT;
- break;
- }
-
- if (reg.resv) {
- ret = -EINVAL;
- break;
- }
-
- if (reg.offset == -1U) {
- start = 0;
- end = IO_RINGFD_REG_MAX;
- } else {
- if (reg.offset >= IO_RINGFD_REG_MAX) {
- ret = -EINVAL;
- break;
- }
- start = reg.offset;
- end = start + 1;
- }
-
- ret = io_ring_add_registered_fd(tctx, reg.data, start, end);
- if (ret < 0)
- break;
-
- reg.offset = ret;
- if (copy_to_user(&arg[i], ®, sizeof(reg))) {
- fput(tctx->registered_rings[reg.offset]);
- tctx->registered_rings[reg.offset] = NULL;
- ret = -EFAULT;
- break;
- }
- }
-
- return i ? i : ret;
-}
-
-static int io_ringfd_unregister(struct io_ring_ctx *ctx, void __user *__arg,
- unsigned nr_args)
-{
- struct io_uring_rsrc_update __user *arg = __arg;
- struct io_uring_task *tctx = current->io_uring;
- struct io_uring_rsrc_update reg;
- int ret = 0, i;
-
- if (!nr_args || nr_args > IO_RINGFD_REG_MAX)
- return -EINVAL;
- if (!tctx)
- return 0;
-
- for (i = 0; i < nr_args; i++) {
- if (copy_from_user(®, &arg[i], sizeof(reg))) {
- ret = -EFAULT;
- break;
- }
- if (reg.resv || reg.data || reg.offset >= IO_RINGFD_REG_MAX) {
- ret = -EINVAL;
- break;
- }
-
- reg.offset = array_index_nospec(reg.offset, IO_RINGFD_REG_MAX);
- if (tctx->registered_rings[reg.offset]) {
- fput(tctx->registered_rings[reg.offset]);
- tctx->registered_rings[reg.offset] = NULL;
- }
- }
-
- return i ? i : ret;
-}
-
static void *io_uring_validate_mmap_request(struct file *file,
loff_t pgoff, size_t sz)
{
void io_req_tw_post_queue(struct io_kiocb *req, s32 res, u32 cflags);
void io_req_task_complete(struct io_kiocb *req, bool *locked);
void io_req_task_queue_fail(struct io_kiocb *req, int ret);
+void tctx_task_work(struct callback_head *cb);
int io_try_cancel(struct io_kiocb *req, struct io_cancel_data *cd);
__cold void io_uring_cancel_generic(bool cancel_all, struct io_sq_data *sqd);
int io_uring_alloc_task_context(struct task_struct *task,
int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr);
int io_do_iopoll(struct io_ring_ctx *ctx, bool force_nonspin);
+struct io_wq_work *io_wq_free_work(struct io_wq_work *work);
+void io_wq_submit_work(struct io_wq_work *work);
+
void io_free_req(struct io_kiocb *req);
void io_queue_next(struct io_kiocb *req);
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/file.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/nospec.h>
+#include <linux/io_uring.h>
+
+#include <uapi/linux/io_uring.h>
+
+#include "io_uring_types.h"
+#include "io_uring.h"
+#include "tctx.h"
+
+static struct io_wq *io_init_wq_offload(struct io_ring_ctx *ctx,
+ struct task_struct *task)
+{
+ struct io_wq_hash *hash;
+ struct io_wq_data data;
+ unsigned int concurrency;
+
+ mutex_lock(&ctx->uring_lock);
+ hash = ctx->hash_map;
+ if (!hash) {
+ hash = kzalloc(sizeof(*hash), GFP_KERNEL);
+ if (!hash) {
+ mutex_unlock(&ctx->uring_lock);
+ return ERR_PTR(-ENOMEM);
+ }
+ refcount_set(&hash->refs, 1);
+ init_waitqueue_head(&hash->wait);
+ ctx->hash_map = hash;
+ }
+ mutex_unlock(&ctx->uring_lock);
+
+ data.hash = hash;
+ data.task = task;
+ data.free_work = io_wq_free_work;
+ data.do_work = io_wq_submit_work;
+
+ /* Do QD, or 4 * CPUS, whatever is smallest */
+ concurrency = min(ctx->sq_entries, 4 * num_online_cpus());
+
+ return io_wq_create(concurrency, &data);
+}
+
+void __io_uring_free(struct task_struct *tsk)
+{
+ struct io_uring_task *tctx = tsk->io_uring;
+
+ WARN_ON_ONCE(!xa_empty(&tctx->xa));
+ WARN_ON_ONCE(tctx->io_wq);
+ WARN_ON_ONCE(tctx->cached_refs);
+
+ kfree(tctx->registered_rings);
+ percpu_counter_destroy(&tctx->inflight);
+ kfree(tctx);
+ tsk->io_uring = NULL;
+}
+
+__cold int io_uring_alloc_task_context(struct task_struct *task,
+ struct io_ring_ctx *ctx)
+{
+ struct io_uring_task *tctx;
+ int ret;
+
+ tctx = kzalloc(sizeof(*tctx), GFP_KERNEL);
+ if (unlikely(!tctx))
+ return -ENOMEM;
+
+ tctx->registered_rings = kcalloc(IO_RINGFD_REG_MAX,
+ sizeof(struct file *), GFP_KERNEL);
+ if (unlikely(!tctx->registered_rings)) {
+ kfree(tctx);
+ return -ENOMEM;
+ }
+
+ ret = percpu_counter_init(&tctx->inflight, 0, GFP_KERNEL);
+ if (unlikely(ret)) {
+ kfree(tctx->registered_rings);
+ kfree(tctx);
+ return ret;
+ }
+
+ tctx->io_wq = io_init_wq_offload(ctx, task);
+ if (IS_ERR(tctx->io_wq)) {
+ ret = PTR_ERR(tctx->io_wq);
+ percpu_counter_destroy(&tctx->inflight);
+ kfree(tctx->registered_rings);
+ kfree(tctx);
+ return ret;
+ }
+
+ xa_init(&tctx->xa);
+ init_waitqueue_head(&tctx->wait);
+ atomic_set(&tctx->in_idle, 0);
+ atomic_set(&tctx->inflight_tracked, 0);
+ task->io_uring = tctx;
+ spin_lock_init(&tctx->task_lock);
+ INIT_WQ_LIST(&tctx->task_list);
+ INIT_WQ_LIST(&tctx->prio_task_list);
+ init_task_work(&tctx->task_work, tctx_task_work);
+ return 0;
+}
+
+int __io_uring_add_tctx_node(struct io_ring_ctx *ctx)
+{
+ struct io_uring_task *tctx = current->io_uring;
+ struct io_tctx_node *node;
+ int ret;
+
+ if (unlikely(!tctx)) {
+ ret = io_uring_alloc_task_context(current, ctx);
+ if (unlikely(ret))
+ return ret;
+
+ tctx = current->io_uring;
+ if (ctx->iowq_limits_set) {
+ unsigned int limits[2] = { ctx->iowq_limits[0],
+ ctx->iowq_limits[1], };
+
+ ret = io_wq_max_workers(tctx->io_wq, limits);
+ if (ret)
+ return ret;
+ }
+ }
+ if (!xa_load(&tctx->xa, (unsigned long)ctx)) {
+ node = kmalloc(sizeof(*node), GFP_KERNEL);
+ if (!node)
+ return -ENOMEM;
+ node->ctx = ctx;
+ node->task = current;
+
+ ret = xa_err(xa_store(&tctx->xa, (unsigned long)ctx,
+ node, GFP_KERNEL));
+ if (ret) {
+ kfree(node);
+ return ret;
+ }
+
+ mutex_lock(&ctx->uring_lock);
+ list_add(&node->ctx_node, &ctx->tctx_list);
+ mutex_unlock(&ctx->uring_lock);
+ }
+ tctx->last = ctx;
+ return 0;
+}
+
+/*
+ * Remove this io_uring_file -> task mapping.
+ */
+__cold void io_uring_del_tctx_node(unsigned long index)
+{
+ struct io_uring_task *tctx = current->io_uring;
+ struct io_tctx_node *node;
+
+ if (!tctx)
+ return;
+ node = xa_erase(&tctx->xa, index);
+ if (!node)
+ return;
+
+ WARN_ON_ONCE(current != node->task);
+ WARN_ON_ONCE(list_empty(&node->ctx_node));
+
+ mutex_lock(&node->ctx->uring_lock);
+ list_del(&node->ctx_node);
+ mutex_unlock(&node->ctx->uring_lock);
+
+ if (tctx->last == node->ctx)
+ tctx->last = NULL;
+ kfree(node);
+}
+
+__cold void io_uring_clean_tctx(struct io_uring_task *tctx)
+{
+ struct io_wq *wq = tctx->io_wq;
+ struct io_tctx_node *node;
+ unsigned long index;
+
+ xa_for_each(&tctx->xa, index, node) {
+ io_uring_del_tctx_node(index);
+ cond_resched();
+ }
+ if (wq) {
+ /*
+ * Must be after io_uring_del_tctx_node() (removes nodes under
+ * uring_lock) to avoid race with io_uring_try_cancel_iowq().
+ */
+ io_wq_put_and_exit(wq);
+ tctx->io_wq = NULL;
+ }
+}
+
+void io_uring_unreg_ringfd(void)
+{
+ struct io_uring_task *tctx = current->io_uring;
+ int i;
+
+ for (i = 0; i < IO_RINGFD_REG_MAX; i++) {
+ if (tctx->registered_rings[i]) {
+ fput(tctx->registered_rings[i]);
+ tctx->registered_rings[i] = NULL;
+ }
+ }
+}
+
+static int io_ring_add_registered_fd(struct io_uring_task *tctx, int fd,
+ int start, int end)
+{
+ struct file *file;
+ int offset;
+
+ for (offset = start; offset < end; offset++) {
+ offset = array_index_nospec(offset, IO_RINGFD_REG_MAX);
+ if (tctx->registered_rings[offset])
+ continue;
+
+ file = fget(fd);
+ if (!file) {
+ return -EBADF;
+ } else if (!io_is_uring_fops(file)) {
+ fput(file);
+ return -EOPNOTSUPP;
+ }
+ tctx->registered_rings[offset] = file;
+ return offset;
+ }
+
+ return -EBUSY;
+}
+
+/*
+ * Register a ring fd to avoid fdget/fdput for each io_uring_enter()
+ * invocation. User passes in an array of struct io_uring_rsrc_update
+ * with ->data set to the ring_fd, and ->offset given for the desired
+ * index. If no index is desired, application may set ->offset == -1U
+ * and we'll find an available index. Returns number of entries
+ * successfully processed, or < 0 on error if none were processed.
+ */
+int io_ringfd_register(struct io_ring_ctx *ctx, void __user *__arg,
+ unsigned nr_args)
+{
+ struct io_uring_rsrc_update __user *arg = __arg;
+ struct io_uring_rsrc_update reg;
+ struct io_uring_task *tctx;
+ int ret, i;
+
+ if (!nr_args || nr_args > IO_RINGFD_REG_MAX)
+ return -EINVAL;
+
+ mutex_unlock(&ctx->uring_lock);
+ ret = io_uring_add_tctx_node(ctx);
+ mutex_lock(&ctx->uring_lock);
+ if (ret)
+ return ret;
+
+ tctx = current->io_uring;
+ for (i = 0; i < nr_args; i++) {
+ int start, end;
+
+ if (copy_from_user(®, &arg[i], sizeof(reg))) {
+ ret = -EFAULT;
+ break;
+ }
+
+ if (reg.resv) {
+ ret = -EINVAL;
+ break;
+ }
+
+ if (reg.offset == -1U) {
+ start = 0;
+ end = IO_RINGFD_REG_MAX;
+ } else {
+ if (reg.offset >= IO_RINGFD_REG_MAX) {
+ ret = -EINVAL;
+ break;
+ }
+ start = reg.offset;
+ end = start + 1;
+ }
+
+ ret = io_ring_add_registered_fd(tctx, reg.data, start, end);
+ if (ret < 0)
+ break;
+
+ reg.offset = ret;
+ if (copy_to_user(&arg[i], ®, sizeof(reg))) {
+ fput(tctx->registered_rings[reg.offset]);
+ tctx->registered_rings[reg.offset] = NULL;
+ ret = -EFAULT;
+ break;
+ }
+ }
+
+ return i ? i : ret;
+}
+
+int io_ringfd_unregister(struct io_ring_ctx *ctx, void __user *__arg,
+ unsigned nr_args)
+{
+ struct io_uring_rsrc_update __user *arg = __arg;
+ struct io_uring_task *tctx = current->io_uring;
+ struct io_uring_rsrc_update reg;
+ int ret = 0, i;
+
+ if (!nr_args || nr_args > IO_RINGFD_REG_MAX)
+ return -EINVAL;
+ if (!tctx)
+ return 0;
+
+ for (i = 0; i < nr_args; i++) {
+ if (copy_from_user(®, &arg[i], sizeof(reg))) {
+ ret = -EFAULT;
+ break;
+ }
+ if (reg.resv || reg.data || reg.offset >= IO_RINGFD_REG_MAX) {
+ ret = -EINVAL;
+ break;
+ }
+
+ reg.offset = array_index_nospec(reg.offset, IO_RINGFD_REG_MAX);
+ if (tctx->registered_rings[reg.offset]) {
+ fput(tctx->registered_rings[reg.offset]);
+ tctx->registered_rings[reg.offset] = NULL;
+ }
+ }
+
+ return i ? i : ret;
+}
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+
+/*
+ * Arbitrary limit, can be raised if need be
+ */
+#define IO_RINGFD_REG_MAX 16
+
+struct io_uring_task {
+ /* submission side */
+ int cached_refs;
+ struct xarray xa;
+ struct wait_queue_head wait;
+ const struct io_ring_ctx *last;
+ struct io_wq *io_wq;
+ struct percpu_counter inflight;
+ atomic_t inflight_tracked;
+ atomic_t in_idle;
+
+ spinlock_t task_lock;
+ struct io_wq_work_list task_list;
+ struct io_wq_work_list prio_task_list;
+ struct callback_head task_work;
+ struct file **registered_rings;
+ bool task_running;
+};
+
+struct io_tctx_node {
+ struct list_head ctx_node;
+ struct task_struct *task;
+ struct io_ring_ctx *ctx;
+};
+
+int io_uring_alloc_task_context(struct task_struct *task,
+ struct io_ring_ctx *ctx);
+void io_uring_del_tctx_node(unsigned long index);
+int __io_uring_add_tctx_node(struct io_ring_ctx *ctx);
+void io_uring_clean_tctx(struct io_uring_task *tctx);
+
+void io_uring_unreg_ringfd(void);
+int io_ringfd_register(struct io_ring_ctx *ctx, void __user *__arg,
+ unsigned nr_args);
+int io_ringfd_unregister(struct io_ring_ctx *ctx, void __user *__arg,
+ unsigned nr_args);
+
+/*
+ * Note that this task has used io_uring. We use it for cancelation purposes.
+ */
+static inline int io_uring_add_tctx_node(struct io_ring_ctx *ctx)
+{
+ struct io_uring_task *tctx = current->io_uring;
+
+ if (likely(tctx && tctx->last == ctx))
+ return 0;
+ return __io_uring_add_tctx_node(ctx);
+}
projects / linux-2.6-microblaze.git / commitdiff