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Fri, 27 Jun 2025 08:09:18 -0700 (PDT) From: Pavel Begunkov To: io-uring@vger.kernel.org, linux-block@vger.kernel.org, linux-nvme@lists.infradead.org Cc: linux-fsdevel@vger.kernel.org, Keith Busch , David Wei , Vishal Verma , asml.silence@gmail.com Subject: [RFC 01/12] file: add callback returning dev for dma operations Date: Fri, 27 Jun 2025 16:10:28 +0100 Message-ID: <4f8aabdbbeda098424556259d69932200464a526.1751035820.git.asml.silence@gmail.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Add a file callback returning a device that can be used for dma pre-mapping buffers. There should be only one device per file, and a file should never return different deivecs during its lifetime. Signed-off-by: Pavel Begunkov --- include/linux/fs.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/include/linux/fs.h b/include/linux/fs.h index 96c7925a6551..9ab5aa413c62 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -82,6 +82,7 @@ struct fs_context; struct fs_parameter_spec; struct fileattr; struct iomap_ops; +struct device; extern void __init inode_init(void); extern void __init inode_init_early(void); @@ -2190,6 +2191,7 @@ struct file_operations { int (*uring_cmd_iopoll)(struct io_uring_cmd *, struct io_comp_batch *, unsigned int poll_flags); int (*mmap_prepare)(struct vm_area_desc *); + struct device *(*get_dma_device)(struct file *); } __randomize_layout; /* Supports async buffered reads */ -- 2.49.0