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Wed, 18 Feb 2026 17:43:44 -0800 (PST) X-Relaying-Domain: purestorage.com Received: from dev-csander.dev.purestorage.com (dev-csander.dev.purestorage.com [10.112.29.101]) by c7-smtp-2023.dev.purestorage.com (Postfix) with ESMTP id 7602434076F; Wed, 18 Feb 2026 18:43:43 -0700 (MST) Received: by dev-csander.dev.purestorage.com (Postfix, from userid 1557716354) id 719CCE41D2F; Wed, 18 Feb 2026 18:43:43 -0700 (MST) From: Caleb Sander Mateos To: Jens Axboe , Christoph Hellwig , Keith Busch , Sagi Grimberg Cc: io-uring@vger.kernel.org, linux-nvme@lists.infradead.org, linux-kernel@vger.kernel.org, Caleb Sander Mateos Subject: [PATCH v2 1/4] io_uring: add REQ_F_IOPOLL Date: Wed, 18 Feb 2026 18:43:32 -0700 Message-ID: <20260219014335.9061-2-csander@purestorage.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20260219014335.9061-1-csander@purestorage.com> References: <20260219014335.9061-1-csander@purestorage.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" A subsequent commit will allow uring_cmds to commands 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 --- include/linux/io_uring_types.h | 3 +++ io_uring/io_uring.c | 9 ++++----- io_uring/rw.c | 11 ++++++----- io_uring/uring_cmd.c | 5 +++-- 4 files changed, 16 insertions(+), 12 deletions(-) diff --git a/include/linux/io_uring_types.h b/include/linux/io_uring_types.h index 3e4a82a6f817..4563e1fafdf0 100644 --- a/include/linux/io_uring_types.h +++ b/include/linux/io_uring_types.h @@ -541,10 +541,11 @@ enum { REQ_F_BUFFERS_COMMIT_BIT, REQ_F_BUF_NODE_BIT, REQ_F_HAS_METADATA_BIT, REQ_F_IMPORT_BUFFER_BIT, REQ_F_SQE_COPIED_BIT, + REW_F_IOPOLL_BIT, =20 /* not a real bit, just to check we're not overflowing the space */ __REQ_F_LAST_BIT, }; =20 @@ -632,10 +633,12 @@ enum { * For SEND_ZC, whether to import buffers (i.e. the first issue). */ REQ_F_IMPORT_BUFFER =3D IO_REQ_FLAG(REQ_F_IMPORT_BUFFER_BIT), /* ->sqe_copy() has been called, if necessary */ REQ_F_SQE_COPIED =3D IO_REQ_FLAG(REQ_F_SQE_COPIED_BIT), + /* request must be iopolled to completion (set in ->issue()) */ + REQ_F_IOPOLL =3D IO_REQ_FLAG(REW_F_IOPOLL_BIT), }; =20 struct io_tw_req { struct io_kiocb *req; }; diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c index ccab8562d273..43059f6e10e0 100644 --- a/io_uring/io_uring.c +++ b/io_uring/io_uring.c @@ -354,11 +354,10 @@ static struct io_kiocb *__io_prep_linked_timeout(stru= ct io_kiocb *req) } =20 static void io_prep_async_work(struct io_kiocb *req) { const struct io_issue_def *def =3D &io_issue_defs[req->opcode]; - struct io_ring_ctx *ctx =3D req->ctx; =20 if (!(req->flags & REQ_F_CREDS)) { req->flags |=3D REQ_F_CREDS; req->creds =3D get_current_cred(); } @@ -376,11 +375,11 @@ static void io_prep_async_work(struct io_kiocb *req) =20 /* don't serialize this request if the fs doesn't need it */ if (should_hash && (req->file->f_flags & O_DIRECT) && (req->file->f_op->fop_flags & FOP_DIO_PARALLEL_WRITE)) should_hash =3D 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) atomic_or(IO_WQ_WORK_UNBOUND, &req->work.flags); } @@ -1417,11 +1416,11 @@ static int io_issue_sqe(struct io_kiocb *req, unsig= ned int issue_flags) =20 if (ret =3D=3D IOU_ISSUE_SKIP_COMPLETE) { ret =3D 0; =20 /* 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; } =20 @@ -1433,11 +1432,11 @@ int io_poll_issue(struct io_kiocb *req, io_tw_token= _t tw) int ret; =20 io_tw_lock(req->ctx, tw); =20 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; =20 ret =3D __io_issue_sqe(req, issue_flags, &io_issue_defs[req->opcode]); =20 WARN_ON_ONCE(ret =3D=3D IOU_ISSUE_SKIP_COMPLETE); @@ -1531,11 +1530,11 @@ void io_wq_submit_work(struct io_wq_work *work) * We can get EAGAIN for iopolled IO even though we're * forcing a sync submission from here, since we can't * 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; cond_resched(); continue; diff --git a/io_uring/rw.c b/io_uring/rw.c index 1a5f262734e8..3bdb9914e673 100644 --- a/io_uring/rw.c +++ b/io_uring/rw.c @@ -502,11 +502,11 @@ static bool io_rw_should_reissue(struct io_kiocb *req) struct io_ring_ctx *ctx =3D req->ctx; =20 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. * Don't attempt to reissue from that path, just let it fail with * -EAGAIN. @@ -638,11 +638,11 @@ static inline void io_rw_done(struct io_kiocb *req, s= size_t ret) ret =3D -EINTR; break; } } =20 - 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); } =20 @@ -652,11 +652,11 @@ static int kiocb_done(struct io_kiocb *req, ssize_t r= et, struct io_rw *rw =3D io_kiocb_to_cmd(req, struct io_rw); unsigned final_ret =3D io_fixup_rw_res(req, ret); =20 if (ret >=3D 0 && req->flags & REQ_F_CUR_POS) req->file->f_pos =3D rw->kiocb.ki_pos; - if (ret >=3D 0 && !(req->ctx->flags & IORING_SETUP_IOPOLL)) { + if (ret >=3D 0 && !(req->flags & REQ_F_IOPOLL)) { u32 cflags =3D 0; =20 __io_complete_rw_common(req, ret); /* * Safe to call io_end from here as we're inline @@ -874,10 +874,11 @@ static int io_rw_init_file(struct io_kiocb *req, fmod= e_t mode, int rw_type) req->flags |=3D REQ_F_NOWAIT; =20 if (ctx->flags & IORING_SETUP_IOPOLL) { if (!(kiocb->ki_flags & IOCB_DIRECT) || !file->f_op->iopoll) return -EOPNOTSUPP; + req->flags |=3D REQ_F_IOPOLL; kiocb->private =3D NULL; kiocb->ki_flags |=3D IOCB_HIPRI; req->iopoll_completed =3D 0; if (ctx->flags & IORING_SETUP_HYBRID_IOPOLL) { /* make sure every req only blocks once*/ @@ -961,11 +962,11 @@ static int __io_read(struct io_kiocb *req, struct io_= br_sel *sel, if (ret =3D=3D -EAGAIN) { /* If we can poll, just do that. */ 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) goto done; ret =3D 0; @@ -1186,11 +1187,11 @@ int io_write(struct io_kiocb *req, unsigned int iss= ue_flags) /* no retry on NONBLOCK nor RWF_NOWAIT */ if (ret2 =3D=3D -EAGAIN && (req->flags & REQ_F_NOWAIT)) goto done; if (!force_nonblock || ret2 !=3D -EAGAIN) { /* IOPOLL retry should happen for io-wq threads */ - if (ret2 =3D=3D -EAGAIN && (req->ctx->flags & IORING_SETUP_IOPOLL)) + if (ret2 =3D=3D -EAGAIN && (req->flags & REQ_F_IOPOLL)) goto ret_eagain; =20 if (ret2 !=3D req->cqe.res && ret2 >=3D 0 && need_complete_io(req)) { trace_io_uring_short_write(req->ctx, kiocb->ki_pos - ret2, req->cqe.res, ret2); diff --git a/io_uring/uring_cmd.c b/io_uring/uring_cmd.c index ee7b49f47cb5..b651c63f6e20 100644 --- a/io_uring/uring_cmd.c +++ b/io_uring/uring_cmd.c @@ -108,11 +108,11 @@ void io_uring_cmd_mark_cancelable(struct io_uring_cmd= *cmd, * Doing cancelations on IOPOLL requests are not supported. Both * because they can't get canceled in the block stack, but also * 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; =20 if (!(cmd->flags & IORING_URING_CMD_CANCELABLE)) { cmd->flags |=3D IORING_URING_CMD_CANCELABLE; io_ring_submit_lock(ctx, issue_flags); @@ -165,11 +165,11 @@ void __io_uring_cmd_done(struct io_uring_cmd *ioucmd,= s32 ret, u64 res2, if (req->ctx->flags & IORING_SETUP_CQE_MIXED) req->cqe.flags |=3D IORING_CQE_F_32; 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) { if (WARN_ON_ONCE(issue_flags & IO_URING_F_UNLOCKED)) return; @@ -258,10 +258,11 @@ int io_uring_cmd(struct io_kiocb *req, unsigned int i= ssue_flags) if (io_is_compat(ctx)) issue_flags |=3D IO_URING_F_COMPAT; if (ctx->flags & IORING_SETUP_IOPOLL) { if (!file->f_op->uring_cmd_iopoll) return -EOPNOTSUPP; + req->flags |=3D REQ_F_IOPOLL; issue_flags |=3D IO_URING_F_IOPOLL; req->iopoll_completed =3D 0; if (ctx->flags & IORING_SETUP_HYBRID_IOPOLL) { /* make sure every req only blocks once */ req->flags &=3D ~REQ_F_IOPOLL_STATE; --=20 2.45.2