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io_uring: add REQ_F_IOPOLL

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A subsequent commit will allow uring_cmds to files that don't implement
->uring_cmd_iopoll() to be issued to IORING_SETUP_IOPOLL io_urings. This
means the ctx's IORING_SETUP_IOPOLL flag isn't sufficient to determine
whether a given request needs to be iopolled.

Introduce a request flag REQ_F_IOPOLL set in ->issue() if a request
needs to be iopolled to completion. Set the flag in io_rw_init_file()
and io_uring_cmd() for requests issued to IORING_SETUP_IOPOLL ctxs. Use
the request flag instead of IORING_SETUP_IOPOLL in places dealing with a
specific request.

A future possibility would be to add an option to enable/disable iopoll
in the io_uring SQE instead of determining it from IORING_SETUP_IOPOLL.

Signed-off-by: Caleb Sander Mateos <csander@purestorage.com>
Reviewed-by: Kanchan Joshi <joshi.k@samsung.com>
Reviewed-by: Anuj Gupta <anuj20.g@samsung.com>
Link: https://patch.msgid.link/20260302172914.2488599-2-csander@purestorage.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Caleb Sander Mateos
2026-03-02 10:29:10 -07:00
committed by Jens Axboe
parent 8c55744919
commit 9165dc4fa9
4 changed files with 16 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
include/linux/io_uring_types.h
View File

@@ -550,6 +550,7 @@ enum {
REQ_F_HAS_METADATA_BIT,
REQ_F_IMPORT_BUFFER_BIT,
REQ_F_SQE_COPIED_BIT,
REQ_F_IOPOLL_BIT,
/* not a real bit, just to check we're not overflowing the space */
__REQ_F_LAST_BIT,
@@ -641,6 +642,8 @@ enum {
REQ_F_IMPORT_BUFFER = IO_REQ_FLAG(REQ_F_IMPORT_BUFFER_BIT),
/* ->sqe_copy() has been called, if necessary */
REQ_F_SQE_COPIED = IO_REQ_FLAG(REQ_F_SQE_COPIED_BIT),
/* request must be iopolled to completion (set in ->issue()) */
REQ_F_IOPOLL = IO_REQ_FLAG(REQ_F_IOPOLL_BIT),
};
struct io_tw_req {

9
io_uring/io_uring.c
View File

@@ -356,7 +356,6 @@ static struct io_kiocb *__io_prep_linked_timeout(struct io_kiocb *req)
static void io_prep_async_work(struct io_kiocb *req)
{
const struct io_issue_def *def = &io_issue_defs[req->opcode];
struct io_ring_ctx *ctx = req->ctx;
if (!(req->flags & REQ_F_CREDS)) {
req->flags |= REQ_F_CREDS;
@@ -378,7 +377,7 @@ static void io_prep_async_work(struct io_kiocb *req)
if (should_hash && (req->file->f_flags & O_DIRECT) &&
(req->file->f_op->fop_flags & FOP_DIO_PARALLEL_WRITE))
should_hash = false;
if (should_hash || (ctx->flags & IORING_SETUP_IOPOLL))
if (should_hash || (req->flags & REQ_F_IOPOLL))
io_wq_hash_work(&req->work, file_inode(req->file));
} else if (!req->file || !S_ISBLK(file_inode(req->file)->i_mode)) {
if (def->unbound_nonreg_file)
@@ -1419,7 +1418,7 @@ static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags)
ret = 0;
/* If the op doesn't have a file, we're not polling for it */
if ((req->ctx->flags & IORING_SETUP_IOPOLL) && def->iopoll_queue)
if ((req->flags & REQ_F_IOPOLL) && def->iopoll_queue)
io_iopoll_req_issued(req, issue_flags);
}
return ret;
@@ -1435,7 +1434,7 @@ int io_poll_issue(struct io_kiocb *req, io_tw_token_t tw)
io_tw_lock(req->ctx, tw);
WARN_ON_ONCE(!req->file);
if (WARN_ON_ONCE(req->ctx->flags & IORING_SETUP_IOPOLL))
if (WARN_ON_ONCE(req->flags & REQ_F_IOPOLL))
return -EFAULT;
ret = __io_issue_sqe(req, issue_flags, &io_issue_defs[req->opcode]);
@@ -1533,7 +1532,7 @@ fail:
* wait for request slots on the block side.
*/
if (!needs_poll) {
if (!(req->ctx->flags & IORING_SETUP_IOPOLL))
if (!(req->flags & REQ_F_IOPOLL))
break;
if (io_wq_worker_stopped())
break;

11
io_uring/rw.c
View File

@@ -504,7 +504,7 @@ static bool io_rw_should_reissue(struct io_kiocb *req)
if (!S_ISBLK(mode) && !S_ISREG(mode))
return false;
if ((req->flags & REQ_F_NOWAIT) || (io_wq_current_is_worker() &&
!(ctx->flags & IORING_SETUP_IOPOLL)))
!(req->flags & REQ_F_IOPOLL)))
return false;
/*
* If ref is dying, we might be running poll reap from the exit work.
@@ -640,7 +640,7 @@ static inline void io_rw_done(struct io_kiocb *req, ssize_t ret)
}
}
if (req->ctx->flags & IORING_SETUP_IOPOLL)
if (req->flags & REQ_F_IOPOLL)
io_complete_rw_iopoll(&rw->kiocb, ret);
else
io_complete_rw(&rw->kiocb, ret);
@@ -654,7 +654,7 @@ static int kiocb_done(struct io_kiocb *req, ssize_t ret,
if (ret >= 0 && req->flags & REQ_F_CUR_POS)
req->file->f_pos = rw->kiocb.ki_pos;
if (ret >= 0 && !(req->ctx->flags & IORING_SETUP_IOPOLL)) {
if (ret >= 0 && !(req->flags & REQ_F_IOPOLL)) {
u32 cflags = 0;
__io_complete_rw_common(req, ret);
@@ -876,6 +876,7 @@ static int io_rw_init_file(struct io_kiocb *req, fmode_t mode, int rw_type)
if (ctx->flags & IORING_SETUP_IOPOLL) {
if (!(kiocb->ki_flags & IOCB_DIRECT) || !file->f_op->iopoll)
return -EOPNOTSUPP;
req->flags |= REQ_F_IOPOLL;
kiocb->private = NULL;
kiocb->ki_flags |= IOCB_HIPRI;
req->iopoll_completed = 0;
@@ -963,7 +964,7 @@ static int __io_read(struct io_kiocb *req, struct io_br_sel *sel,
if (io_file_can_poll(req))
return -EAGAIN;
/* IOPOLL retry should happen for io-wq threads */
if (!force_nonblock && !(req->ctx->flags & IORING_SETUP_IOPOLL))
if (!force_nonblock && !(req->flags & REQ_F_IOPOLL))
goto done;
/* no retry on NONBLOCK nor RWF_NOWAIT */
if (req->flags & REQ_F_NOWAIT)
@@ -1188,7 +1189,7 @@ int io_write(struct io_kiocb *req, unsigned int issue_flags)
goto done;
if (!force_nonblock || ret2 != -EAGAIN) {
/* IOPOLL retry should happen for io-wq threads */
if (ret2 == -EAGAIN && (req->ctx->flags & IORING_SETUP_IOPOLL))
if (ret2 == -EAGAIN && (req->flags & REQ_F_IOPOLL))
goto ret_eagain;
if (ret2 != req->cqe.res && ret2 >= 0 && need_complete_io(req)) {

5
io_uring/uring_cmd.c
View File

@@ -110,7 +110,7 @@ void io_uring_cmd_mark_cancelable(struct io_uring_cmd *cmd,
* because iopoll completion data overlaps with the hash_node used
* for tracking.
*/
if (ctx->flags & IORING_SETUP_IOPOLL)
if (req->flags & REQ_F_IOPOLL)
return;
if (!(cmd->flags & IORING_URING_CMD_CANCELABLE)) {
@@ -167,7 +167,7 @@ void __io_uring_cmd_done(struct io_uring_cmd *ioucmd, s32 ret, u64 res2,
io_req_set_cqe32_extra(req, res2, 0);
}
io_req_uring_cleanup(req, issue_flags);
if (req->ctx->flags & IORING_SETUP_IOPOLL) {
if (req->flags & REQ_F_IOPOLL) {
/* order with io_iopoll_req_issued() checking ->iopoll_complete */
smp_store_release(&req->iopoll_completed, 1);
} else if (issue_flags & IO_URING_F_COMPLETE_DEFER) {
@@ -260,6 +260,7 @@ int io_uring_cmd(struct io_kiocb *req, unsigned int issue_flags)
if (ctx->flags & IORING_SETUP_IOPOLL) {
if (!file->f_op->uring_cmd_iopoll)
return -EOPNOTSUPP;
req->flags |= REQ_F_IOPOLL;
issue_flags |= IO_URING_F_IOPOLL;
req->iopoll_completed = 0;
if (ctx->flags & IORING_SETUP_HYBRID_IOPOLL) {