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Tue, 11 Mar 2025 04:42:01 -0700 (PDT) From: Sidong Yang To: Jens Axboe , Pavel Begunkov , Josef Bacik , David Sterba Cc: Sidong Yang , io-uring@vger.kernel.org, linux-kernel@vger.kernel.org, linux-btrfs@vger.kernel.org Subject: [RFC PATCH 1/2] io_uring: cmd: introduce io_uring_cmd_import_fixed_vec Date: Tue, 11 Mar 2025 11:40:41 +0000 Message-ID: <20250311114053.216359-2-sidong.yang@furiosa.ai> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250311114053.216359-1-sidong.yang@furiosa.ai> References: <20250311114053.216359-1-sidong.yang@furiosa.ai> Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit io_uring_cmd_import_fixed_vec() could be used for using multiple fixed buffer in uring_cmd callback. Signed-off-by: Sidong Yang --- include/linux/io_uring/cmd.h | 14 ++++++++++++++ io_uring/uring_cmd.c | 29 +++++++++++++++++++++++++++++ 2 files changed, 43 insertions(+) diff --git a/include/linux/io_uring/cmd.h b/include/linux/io_uring/cmd.h index 598cacda4aa3..75cf25c1e730 100644 --- a/include/linux/io_uring/cmd.h +++ b/include/linux/io_uring/cmd.h @@ -44,6 +44,13 @@ int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw, struct io_uring_cmd *ioucmd, unsigned int issue_flags); +int io_uring_cmd_import_fixed_vec(const struct iovec __user *uiovec, + unsigned long nr_segs, int rw, + struct iov_iter *iter, + struct io_uring_cmd *ioucmd, + struct iou_vec *iou_vec, bool compat, + unsigned int issue_flags); + /* * Completes the request, i.e. posts an io_uring CQE and deallocates @ioucmd * and the corresponding io_uring request. @@ -76,6 +83,13 @@ io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw, { return -EOPNOTSUPP; } +int io_uring_cmd_import_fixed_vec(int rw, struct iov_iter *iter, + struct io_uring_cmd *ioucmd, + struct iou_vec *vec, unsigned nr_iovs, + unsigned iovec_off, unsigned int issue_flags) +{ + return -EOPNOTSUPP; +} static inline void io_uring_cmd_done(struct io_uring_cmd *cmd, ssize_t ret, u64 ret2, unsigned issue_flags) { diff --git a/io_uring/uring_cmd.c b/io_uring/uring_cmd.c index de39b602aa82..58e2932f29e7 100644 --- a/io_uring/uring_cmd.c +++ b/io_uring/uring_cmd.c @@ -255,6 +255,35 @@ int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw, } EXPORT_SYMBOL_GPL(io_uring_cmd_import_fixed); +int io_uring_cmd_import_fixed_vec(const struct iovec __user *uiovec, + unsigned long nr_segs, int rw, + struct iov_iter *iter, + struct io_uring_cmd *ioucmd, + struct iou_vec *iou_vec, bool compat, + unsigned int issue_flags) +{ + struct io_kiocb *req = cmd_to_io_kiocb(ioucmd); + struct iovec *iov; + int ret; + + iov = iovec_from_user(uiovec, nr_segs, 0, NULL, compat); + if (IS_ERR(iov)) + return PTR_ERR(iov); + + ret = io_vec_realloc(iou_vec, nr_segs); + if (ret) { + kfree(iov); + return ret; + } + memcpy(iou_vec->iovec, iov, sizeof(*iov) * nr_segs); + kfree(iov); + + ret = io_import_reg_vec(rw, iter, req, iou_vec, iou_vec->nr, 0, + issue_flags); + return ret; +} +EXPORT_SYMBOL_GPL(io_uring_cmd_import_fixed_vec); + void io_uring_cmd_issue_blocking(struct io_uring_cmd *ioucmd) { struct io_kiocb *req = cmd_to_io_kiocb(ioucmd); -- 2.43.0