[PATCH net-next v4 13/27] io_uring: export io_put_task()

Pavel Begunkov
2022-07-07T11:52:50Z

Make io_put_task() available to non-core parts of io_uring, we'll need
it for notification infrastructure.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
---
include/linux/io_uring_types.h | 25 +++++++++++++++++++++++++
io_uring/io_uring.c | 11 +----------
io_uring/io_uring.h | 10 ++++++++++
io_uring/tctx.h | 26 --------------------------
4 files changed, 36 insertions(+), 36 deletions(-)

diff --git a/include/linux/io_uring_types.h b/include/linux/io_uring_types.h
index 26ef11e978d4..d876a0367081 100644
--- a/include/linux/io_uring_types.h
+++ b/include/linux/io_uring_types.h
@@ -4,6 +4,7 @@
#include <linux/blkdev.h>
#include <linux/task_work.h>
#include <linux/bitmap.h>
+#include <linux/llist.h>
#include <uapi/linux/io_uring.h>

struct io_wq_work_node {
@@ -43,6 +44,30 @@ struct io_hash_table {
unsigned hash_bits;
};

+/*
+ * Arbitrary limit, can be raised if need be
+ */
+#define IO_RINGFD_REG_MAX 16
+
+struct io_uring_task {
+ /* submission side */
+ int cached_refs;
+ const struct io_ring_ctx *last;
+ struct io_wq *io_wq;
+ struct file *registered_rings[IO_RINGFD_REG_MAX];
+
+ struct xarray xa;
+ struct wait_queue_head wait;
+ atomic_t in_idle;
+ atomic_t inflight_tracked;
+ struct percpu_counter inflight;
+
+ struct { /* task_work */
+ struct llist_head task_list;
+ struct callback_head task_work;
+ } ____cacheline_aligned_in_smp;
+};
+
struct io_uring {
u32 head ____cacheline_aligned_in_smp;
u32 tail ____cacheline_aligned_in_smp;
diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index caf979cd4327..bb644b1b575a 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -602,7 +602,7 @@ static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx)
return ret;
}

-static void __io_put_task(struct task_struct *task, int nr)
+void __io_put_task(struct task_struct *task, int nr)
{
struct io_uring_task *tctx = task->io_uring;

@@ -612,15 +612,6 @@ static void __io_put_task(struct task_struct *task, int nr)
put_task_struct_many(task, nr);
}

-/* must to be called somewhat shortly after putting a request */
-static inline void io_put_task(struct task_struct *task, int nr)
-{
- if (likely(task == current))
- task->io_uring->cached_refs += nr;
- else
- __io_put_task(task, nr);
-}
-
static void io_task_refs_refill(struct io_uring_task *tctx)
{
unsigned int refill = -tctx->cached_refs + IO_TCTX_REFS_CACHE_NR;
diff --git a/io_uring/io_uring.h b/io_uring/io_uring.h
index 868f45d55543..2379d9e70c10 100644
--- a/io_uring/io_uring.h
+++ b/io_uring/io_uring.h
@@ -66,6 +66,7 @@ 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);
+void __io_put_task(struct task_struct *task, int nr);

bool io_match_task_safe(struct io_kiocb *head, struct task_struct *task,
bool cancel_all);
@@ -253,4 +254,13 @@ static inline void io_commit_cqring_flush(struct io_ring_ctx *ctx)
__io_commit_cqring_flush(ctx);
}

+/* must to be called somewhat shortly after putting a request */
+static inline void io_put_task(struct task_struct *task, int nr)
+{
+ if (likely(task == current))
+ task->io_uring->cached_refs += nr;
+ else
+ __io_put_task(task, nr);
+}
+
#endif
diff --git a/io_uring/tctx.h b/io_uring/tctx.h
index 8a33ff6e5d91..25974beed4d6 100644
--- a/io_uring/tctx.h
+++ b/io_uring/tctx.h
@@ -1,31 +1,5 @@
// SPDX-License-Identifier: GPL-2.0

-#include <linux/llist.h>
-
-/*
- * Arbitrary limit, can be raised if need be
- */
-#define IO_RINGFD_REG_MAX 16
-
-struct io_uring_task {
- /* submission side */
- int cached_refs;
- const struct io_ring_ctx *last;
- struct io_wq *io_wq;
- struct file *registered_rings[IO_RINGFD_REG_MAX];
-
- struct xarray xa;
- struct wait_queue_head wait;
- atomic_t in_idle;
- atomic_t inflight_tracked;
- struct percpu_counter inflight;
-
- struct { /* task_work */
- struct llist_head task_list;
- struct callback_head task_work;
- } ____cacheline_aligned_in_smp;
-};
-
struct io_tctx_node {
struct list_head ctx_node;
struct task_struct *task;
--
2.36.1