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Add a helper function taking care of it. Signed-off-by: Pavel Begunkov --- io_uring/net.c | 23 +++-------------------- io_uring/rsrc.c | 26 ++++++++++++++++++++++++++ io_uring/rsrc.h | 2 ++ io_uring/rw.c | 21 +-------------------- 4 files changed, 32 insertions(+), 40 deletions(-) diff --git a/io_uring/net.c b/io_uring/net.c index 9fa5c9570875..6b8dbadf445f 100644 --- a/io_uring/net.c +++ b/io_uring/net.c @@ -403,9 +403,7 @@ static int io_sendmsg_zc_setup(struct io_kiocb *req, const struct io_uring_sqe * struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); struct io_async_msghdr *kmsg = req->async_data; struct user_msghdr msg; - int ret, iovec_off; - struct iovec *iov; - void *res; + int ret; if (!(sr->flags & IORING_RECVSEND_FIXED_BUF)) return io_sendmsg_setup(req, sqe); @@ -416,24 +414,9 @@ static int io_sendmsg_zc_setup(struct io_kiocb *req, const struct io_uring_sqe * if (unlikely(ret)) return ret; sr->msg_control = kmsg->msg.msg_control_user; - - if (msg.msg_iovlen > kmsg->vec.nr || WARN_ON_ONCE(!kmsg->vec.iovec)) { - ret = io_vec_realloc(&kmsg->vec, msg.msg_iovlen); - if (ret) - return ret; - req->flags |= REQ_F_NEED_CLEANUP; - } - iovec_off = kmsg->vec.nr - msg.msg_iovlen; - iov = kmsg->vec.iovec + iovec_off; - - res = iovec_from_user(msg.msg_iov, msg.msg_iovlen, kmsg->vec.nr, iov, - io_is_compat(req->ctx)); - if (IS_ERR(res)) - return PTR_ERR(res); - kmsg->msg.msg_iter.nr_segs = msg.msg_iovlen; - req->flags |= REQ_F_IMPORT_BUFFER; - return ret; + + return io_prep_reg_iovec(req, &kmsg->vec, msg.msg_iov, msg.msg_iovlen); } #define SENDMSG_FLAGS (IORING_RECVSEND_POLL_FIRST | IORING_RECVSEND_BUNDLE) diff --git a/io_uring/rsrc.c b/io_uring/rsrc.c index 71fe47facd4c..0e413e910f3d 100644 --- a/io_uring/rsrc.c +++ b/io_uring/rsrc.c @@ -1397,3 +1397,29 @@ int io_import_reg_vec(int ddir, struct iov_iter *iter, return io_vec_fill_bvec(ddir, iter, imu, iov, nr_iovs, vec); } + +int io_prep_reg_iovec(struct io_kiocb *req, struct iou_vec *iv, + const struct iovec __user *uvec, size_t uvec_segs) +{ + struct iovec *iov; + int iovec_off, ret; + void *res; + + if (uvec_segs > iv->nr) { + ret = io_vec_realloc(iv, uvec_segs); + if (ret) + return ret; + req->flags |= REQ_F_NEED_CLEANUP; + } + + /* pad iovec to the right */ + iovec_off = iv->nr - uvec_segs; + iov = iv->iovec + iovec_off; + res = iovec_from_user(uvec, uvec_segs, uvec_segs, iov, + io_is_compat(req->ctx)); + if (IS_ERR(res)) + return PTR_ERR(res); + + req->flags |= REQ_F_IMPORT_BUFFER; + return 0; +} diff --git a/io_uring/rsrc.h b/io_uring/rsrc.h index b0097c06b577..43f784915573 100644 --- a/io_uring/rsrc.h +++ b/io_uring/rsrc.h @@ -67,6 +67,8 @@ int io_import_reg_vec(int ddir, struct iov_iter *iter, struct io_kiocb *req, struct iou_vec *vec, unsigned nr_iovs, unsigned iovec_off, unsigned issue_flags); +int io_prep_reg_iovec(struct io_kiocb *req, struct iou_vec *iv, + const struct iovec __user *uvec, size_t uvec_segs); int io_register_clone_buffers(struct io_ring_ctx *ctx, void __user *arg); int io_sqe_buffers_unregister(struct io_ring_ctx *ctx); diff --git a/io_uring/rw.c b/io_uring/rw.c index 50037313555f..4861b876f48e 100644 --- a/io_uring/rw.c +++ b/io_uring/rw.c @@ -407,28 +407,9 @@ static int io_rw_prep_reg_vec(struct io_kiocb *req) struct io_rw *rw = io_kiocb_to_cmd(req, struct io_rw); 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Sat, 08 Mar 2025 10:20:35 -0800 (PST) Received: from 127.0.0.1localhost ([85.255.236.160]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3912c106a1asm9472996f8f.100.2025.03.08.10.20.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 08 Mar 2025 10:20:34 -0800 (PST) From: Pavel Begunkov To: io-uring@vger.kernel.org Cc: asml.silence@gmail.com Subject: [PATCH 2/2] io_uring: rely on io_prep_reg_vec for iovec placement Date: Sat, 8 Mar 2025 18:21:16 +0000 Message-ID: <08ed87ca4bbc06724373b6ce06f36b703fe60c4e.1741457480.git.asml.silence@gmail.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: References: Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 All vectored reg buffer users should use io_import_reg_vec() for iovec imports, since iovec placement is the function's responsibility and callers shouldn't know much about it, drop the offset parameter from io_prep_reg_vec() and calculate it inside. Signed-off-by: Pavel Begunkov --- io_uring/net.c | 4 +--- io_uring/rsrc.c | 8 ++++---- io_uring/rsrc.h | 3 +-- io_uring/rw.c | 3 +-- 4 files changed, 7 insertions(+), 11 deletions(-) diff --git a/io_uring/net.c b/io_uring/net.c index 6b8dbadf445f..1e36a72e4008 100644 --- a/io_uring/net.c +++ b/io_uring/net.c @@ -1513,12 +1513,10 @@ int io_sendmsg_zc(struct io_kiocb *req, unsigned int issue_flags) if (req->flags & REQ_F_IMPORT_BUFFER) { unsigned uvec_segs = kmsg->msg.msg_iter.nr_segs; - unsigned iovec_off = kmsg->vec.nr - uvec_segs; int ret; ret = io_import_reg_vec(ITER_SOURCE, &kmsg->msg.msg_iter, req, - &kmsg->vec, uvec_segs, iovec_off, - issue_flags); + &kmsg->vec, uvec_segs, issue_flags); if (unlikely(ret)) return ret; kmsg->msg.sg_from_iter = io_sg_from_iter; diff --git a/io_uring/rsrc.c b/io_uring/rsrc.c index 0e413e910f3d..607b09bd8374 100644 --- a/io_uring/rsrc.c +++ b/io_uring/rsrc.c @@ -1349,11 +1349,11 @@ static int io_estimate_bvec_size(struct iovec *iov, unsigned nr_iovs, int io_import_reg_vec(int ddir, struct iov_iter *iter, struct io_kiocb *req, struct iou_vec *vec, - unsigned nr_iovs, unsigned iovec_off, - unsigned issue_flags) + unsigned nr_iovs, unsigned issue_flags) { struct io_rsrc_node *node; struct io_mapped_ubuf *imu; + unsigned iovec_off; struct iovec *iov; unsigned nr_segs; @@ -1366,6 +1366,7 @@ int io_import_reg_vec(int ddir, struct iov_iter *iter, if (!(imu->dir & (1 << ddir))) return -EFAULT; + iovec_off = vec->nr - nr_iovs; iov = vec->iovec + iovec_off; nr_segs = io_estimate_bvec_size(iov, nr_iovs, imu); @@ -1377,8 +1378,7 @@ int io_import_reg_vec(int ddir, struct iov_iter *iter, nr_segs += nr_iovs; } - if (WARN_ON_ONCE(iovec_off + nr_iovs != vec->nr) || - nr_segs > vec->nr) { + if (nr_segs > vec->nr) { struct iou_vec tmp_vec = {}; int ret; diff --git a/io_uring/rsrc.h b/io_uring/rsrc.h index 43f784915573..b52242852ff3 100644 --- a/io_uring/rsrc.h +++ b/io_uring/rsrc.h @@ -65,8 +65,7 @@ int io_import_reg_buf(struct io_kiocb *req, struct iov_iter *iter, unsigned issue_flags); int io_import_reg_vec(int ddir, struct iov_iter *iter, struct io_kiocb *req, struct iou_vec *vec, - unsigned nr_iovs, unsigned iovec_off, - unsigned issue_flags); + unsigned nr_iovs, unsigned issue_flags); int io_prep_reg_iovec(struct io_kiocb *req, struct iou_vec *iv, const struct iovec __user *uvec, size_t uvec_segs); diff --git a/io_uring/rw.c b/io_uring/rw.c index 4861b876f48e..246b22225919 100644 --- a/io_uring/rw.c +++ b/io_uring/rw.c @@ -390,11 +390,10 @@ static int io_rw_import_reg_vec(struct io_kiocb *req, { struct io_rw *rw = io_kiocb_to_cmd(req, struct io_rw); unsigned uvec_segs = rw->len; - unsigned iovec_off = io->vec.nr - uvec_segs; int ret; ret = io_import_reg_vec(ddir, &io->iter, req, &io->vec, - uvec_segs, iovec_off, issue_flags); + uvec_segs, issue_flags); if (unlikely(ret)) return ret; iov_iter_save_state(&io->iter, &io->iter_state);