io_uring: add io_file_can_poll() helper
This adds a flag to avoid dipping dereferencing file and then f_op to
figure out if the file has a poll handler defined or not. We generally
call this at least twice for networked workloads, and if using ring
provided buffers, we do it on every buffer selection. Particularly the
latter is troublesome, as it's otherwise a very fast operation.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/include/linux/io_uring_types.h b/include/linux/io_uring_types.h
index e19698d..4ddc7b3 100644
--- a/include/linux/io_uring_types.h
+++ b/include/linux/io_uring_types.h
@@ -464,6 +464,7 @@ enum {
REQ_F_ISREG_BIT,
REQ_F_POLL_NO_LAZY_BIT,
REQ_F_CANCEL_SEQ_BIT,
+ REQ_F_CAN_POLL_BIT,
/* not a real bit, just to check we're not overflowing the space */
__REQ_F_LAST_BIT,
@@ -538,6 +539,8 @@ enum {
REQ_F_POLL_NO_LAZY = IO_REQ_FLAG(REQ_F_POLL_NO_LAZY_BIT),
/* cancel sequence is set and valid */
REQ_F_CANCEL_SEQ = IO_REQ_FLAG(REQ_F_CANCEL_SEQ_BIT),
+ /* file is pollable */
+ REQ_F_CAN_POLL = IO_REQ_FLAG(REQ_F_CAN_POLL_BIT),
};
typedef void (*io_req_tw_func_t)(struct io_kiocb *req, struct io_tw_state *ts);
diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index fd552b2..17bd16b 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -1968,7 +1968,7 @@ void io_wq_submit_work(struct io_wq_work *work)
if (req->flags & REQ_F_FORCE_ASYNC) {
bool opcode_poll = def->pollin || def->pollout;
- if (opcode_poll && file_can_poll(req->file)) {
+ if (opcode_poll && io_file_can_poll(req)) {
needs_poll = true;
issue_flags |= IO_URING_F_NONBLOCK;
}
diff --git a/io_uring/io_uring.h b/io_uring/io_uring.h
index d549571..2952551 100644
--- a/io_uring/io_uring.h
+++ b/io_uring/io_uring.h
@@ -5,6 +5,7 @@
#include <linux/lockdep.h>
#include <linux/resume_user_mode.h>
#include <linux/kasan.h>
+#include <linux/poll.h>
#include <linux/io_uring_types.h>
#include <uapi/linux/eventpoll.h>
#include "io-wq.h"
@@ -398,4 +399,15 @@ static inline size_t uring_sqe_size(struct io_ring_ctx *ctx)
return 2 * sizeof(struct io_uring_sqe);
return sizeof(struct io_uring_sqe);
}
+
+static inline bool io_file_can_poll(struct io_kiocb *req)
+{
+ if (req->flags & REQ_F_CAN_POLL)
+ return true;
+ if (file_can_poll(req->file)) {
+ req->flags |= REQ_F_CAN_POLL;
+ return true;
+ }
+ return false;
+}
#endif
diff --git a/io_uring/kbuf.c b/io_uring/kbuf.c
index 18df5a9..7188061 100644
--- a/io_uring/kbuf.c
+++ b/io_uring/kbuf.c
@@ -180,7 +180,7 @@ static void __user *io_ring_buffer_select(struct io_kiocb *req, size_t *len,
req->buf_list = bl;
req->buf_index = buf->bid;
- if (issue_flags & IO_URING_F_UNLOCKED || !file_can_poll(req->file)) {
+ if (issue_flags & IO_URING_F_UNLOCKED || !io_file_can_poll(req)) {
/*
* If we came in unlocked, we have no choice but to consume the
* buffer here, otherwise nothing ensures that the buffer won't
diff --git a/io_uring/poll.c b/io_uring/poll.c
index c2b0a2d..3f3380d 100644
--- a/io_uring/poll.c
+++ b/io_uring/poll.c
@@ -724,7 +724,7 @@ int io_arm_poll_handler(struct io_kiocb *req, unsigned issue_flags)
if (!def->pollin && !def->pollout)
return IO_APOLL_ABORTED;
- if (!file_can_poll(req->file))
+ if (!io_file_can_poll(req))
return IO_APOLL_ABORTED;
if (!(req->flags & REQ_F_APOLL_MULTISHOT))
mask |= EPOLLONESHOT;
diff --git a/io_uring/rw.c b/io_uring/rw.c
index d5e79d9..0fb7a04 100644
--- a/io_uring/rw.c
+++ b/io_uring/rw.c
@@ -682,7 +682,7 @@ static bool io_rw_should_retry(struct io_kiocb *req)
* just use poll if we can, and don't attempt if the fs doesn't
* support callback based unlocks
*/
- if (file_can_poll(req->file) || !(req->file->f_mode & FMODE_BUF_RASYNC))
+ if (io_file_can_poll(req) || !(req->file->f_mode & FMODE_BUF_RASYNC))
return false;
wait->wait.func = io_async_buf_func;
@@ -831,7 +831,7 @@ static int __io_read(struct io_kiocb *req, unsigned int issue_flags)
* If we can poll, just do that. For a vectored read, we'll
* need to copy state first.
*/
- if (file_can_poll(req->file) && !io_issue_defs[req->opcode].vectored)
+ if (io_file_can_poll(req) && !io_issue_defs[req->opcode].vectored)
return -EAGAIN;
/* IOPOLL retry should happen for io-wq threads */
if (!force_nonblock && !(req->ctx->flags & IORING_SETUP_IOPOLL))
@@ -930,7 +930,7 @@ int io_read_mshot(struct io_kiocb *req, unsigned int issue_flags)
/*
* Multishot MUST be used on a pollable file
*/
- if (!file_can_poll(req->file))
+ if (!io_file_can_poll(req))
return -EBADFD;
ret = __io_read(req, issue_flags);
