1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* rust_binder_internal.h 3 * 4 * This file contains internal data structures used by Rust Binder. Mostly, 5 * these are type definitions used only by binderfs or things that Rust Binder 6 * define and export to binderfs. 7 * 8 * It does not include things exported by binderfs to Rust Binder since this 9 * file is not included as input to bindgen. 10 * 11 * Copyright (C) 2025 Google LLC. 12 */ 13 14 #ifndef _LINUX_RUST_BINDER_INTERNAL_H 15 #define _LINUX_RUST_BINDER_INTERNAL_H 16 17 #define RUST_BINDERFS_SUPER_MAGIC 0x6c6f6f71 18 19 #include <linux/seq_file.h> 20 #include <uapi/linux/android/binder.h> 21 #include <uapi/linux/android/binderfs.h> 22 23 /* 24 * The internal data types in the Rust Binder driver are opaque to C, so we use 25 * void pointer typedefs for these types. 26 */ 27 typedef void *rust_binder_context; 28 29 /** 30 * struct binder_device - information about a binder device node 31 * @minor: the minor number used by this device 32 * @ctx: the Rust Context used by this device, or null for binder-control 33 * 34 * This is used as the private data for files directly in binderfs, but not 35 * files in the binder_logs subdirectory. This struct owns a refcount on `ctx` 36 * and the entry for `minor` in `binderfs_minors`. For binder-control `ctx` is 37 * null. 38 */ 39 struct binder_device { 40 int minor; 41 rust_binder_context ctx; 42 }; 43 44 int rust_binder_stats_show(struct seq_file *m, void *unused); 45 int rust_binder_state_show(struct seq_file *m, void *unused); 46 int rust_binder_transactions_show(struct seq_file *m, void *unused); 47 int rust_binder_proc_show(struct seq_file *m, void *pid); 48 49 extern const struct file_operations rust_binder_fops; 50 rust_binder_context rust_binder_new_context(char *name); 51 void rust_binder_remove_context(rust_binder_context device); 52 53 /** 54 * binderfs_mount_opts - mount options for binderfs 55 * @max: maximum number of allocatable binderfs binder devices 56 * @stats_mode: enable binder stats in binderfs. 57 */ 58 struct binderfs_mount_opts { 59 int max; 60 int stats_mode; 61 }; 62 63 /** 64 * binderfs_info - information about a binderfs mount 65 * @ipc_ns: The ipc namespace the binderfs mount belongs to. 66 * @control_dentry: This records the dentry of this binderfs mount 67 * binder-control device. 68 * @root_uid: uid that needs to be used when a new binder device is 69 * created. 70 * @root_gid: gid that needs to be used when a new binder device is 71 * created. 72 * @mount_opts: The mount options in use. 73 * @device_count: The current number of allocated binder devices. 74 * @proc_log_dir: Pointer to the directory dentry containing process-specific 75 * logs. 76 */ 77 struct binderfs_info { 78 struct ipc_namespace *ipc_ns; 79 struct dentry *control_dentry; 80 kuid_t root_uid; 81 kgid_t root_gid; 82 struct binderfs_mount_opts mount_opts; 83 int device_count; 84 struct dentry *proc_log_dir; 85 }; 86 87 #endif /* _LINUX_RUST_BINDER_INTERNAL_H */ 88