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Fri, 16 Jan 2026 15:31:18 -0800 (PST) From: Joanne Koong To: axboe@kernel.dk, miklos@szeredi.hu Cc: bschubert@ddn.com, csander@purestorage.com, krisman@suse.de, io-uring@vger.kernel.org, asml.silence@gmail.com, xiaobing.li@samsung.com, safinaskar@gmail.com, linux-fsdevel@vger.kernel.org Subject: [PATCH v4 09/25] io_uring/kbuf: add io_uring_is_kmbuf_ring() Date: Fri, 16 Jan 2026 15:30:28 -0800 Message-ID: <20260116233044.1532965-10-joannelkoong@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260116233044.1532965-1-joannelkoong@gmail.com> References: <20260116233044.1532965-1-joannelkoong@gmail.com> 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_is_kmbuf_ring() returns true if there is a kernel-managed buffer ring at the specified buffer group. This is a preparatory patch for upcoming fuse kernel-managed buffer support, which needs to ensure the buffer ring registered by the server is a kernel-managed buffer ring. Signed-off-by: Joanne Koong --- include/linux/io_uring/cmd.h | 9 +++++++++ io_uring/kbuf.c | 20 ++++++++++++++++++++ 2 files changed, 29 insertions(+) diff --git a/include/linux/io_uring/cmd.h b/include/linux/io_uring/cmd.h index de3f550598cf..6ff5c0386d0a 100644 --- a/include/linux/io_uring/cmd.h +++ b/include/linux/io_uring/cmd.h @@ -100,6 +100,9 @@ int io_uring_buf_ring_unpin(struct io_uring_cmd *cmd, unsigned buf_group, int io_uring_kmbuf_recycle(struct io_uring_cmd *cmd, unsigned int buf_group, u64 addr, unsigned int len, unsigned int bid, unsigned int issue_flags); + +bool io_uring_is_kmbuf_ring(struct io_uring_cmd *cmd, unsigned int buf_group, + unsigned int issue_flags); #else static inline int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw, @@ -174,6 +177,12 @@ static inline int io_uring_kmbuf_recycle(struct io_uring_cmd *cmd, { return -EOPNOTSUPP; } +static inline bool io_uring_is_kmbuf_ring(struct io_uring_cmd *cmd, + unsigned int buf_group, + unsigned int issue_flags) +{ + return false; +} #endif static inline struct io_uring_cmd *io_uring_cmd_from_tw(struct io_tw_req tw_req) diff --git a/io_uring/kbuf.c b/io_uring/kbuf.c index a7d7d2c6b42c..d86199ac3377 100644 --- a/io_uring/kbuf.c +++ b/io_uring/kbuf.c @@ -961,3 +961,23 @@ int io_register_kmbuf_ring(struct io_ring_ctx *ctx, void __user *arg) return 0; } + +bool io_uring_is_kmbuf_ring(struct io_uring_cmd *cmd, unsigned int buf_group, + unsigned int issue_flags) +{ + struct io_ring_ctx *ctx = cmd_to_io_kiocb(cmd)->ctx; + struct io_buffer_list *bl; + bool is_kmbuf_ring = false; + + io_ring_submit_lock(ctx, issue_flags); + + bl = io_buffer_get_list(ctx, buf_group); + if (likely(bl) && (bl->flags & IOBL_KERNEL_MANAGED)) { + WARN_ON_ONCE(!(bl->flags & IOBL_BUF_RING)); + is_kmbuf_ring = true; + } + + io_ring_submit_unlock(ctx, issue_flags); + return is_kmbuf_ring; +} +EXPORT_SYMBOL_GPL(io_uring_is_kmbuf_ring); -- 2.47.3