linux-imx

/* SPDX-License-Identifier: GPL-2.0 */

​

#include <linux/compiler_types.h>

#include <linux/errno.h>

#include <linux/fs.h>

#include <linux/fsnotify.h>

#include <linux/gfp.h>

#include <linux/idr.h>

#include <linux/init.h>

#include <linux/ipc_namespace.h>

#include <linux/kdev_t.h>

#include <linux/kernel.h>

#include <linux/list.h>

#include <linux/namei.h>

#include <linux/magic.h>

#include <linux/major.h>

#include <linux/miscdevice.h>

#include <linux/module.h>

#include <linux/mutex.h>

#include <linux/mount.h>

#include <linux/parser.h>

#include <linux/radix-tree.h>

#include <linux/sched.h>

#include <linux/seq_file.h>

#include <linux/slab.h>

#include <linux/spinlock_types.h>

#include <linux/stddef.h>

#include <linux/string.h>

#include <linux/types.h>

#include <linux/uaccess.h>

#include <linux/user_namespace.h>

#include <linux/xarray.h>

#include <uapi/asm-generic/errno-base.h>

#include <uapi/linux/android/binder.h>

#include <uapi/linux/android/binderfs.h>

​

#include "binder_internal.h"

​

#define FIRST_INODE 1

#define SECOND_INODE 2

#define INODE_OFFSET 3

#define INTSTRLEN 21

#define BINDERFS_MAX_MINOR (1U << MINORBITS)

/* Ensure that the initial ipc namespace always has devices available. */

#define BINDERFS_MAX_MINOR_CAPPED (BINDERFS_MAX_MINOR - 4)

​

static dev_t binderfs_dev;

static DEFINE_MUTEX(binderfs_minors_mutex);

static DEFINE_IDA(binderfs_minors);

​

/**

 * binderfs_mount_opts - mount options for binderfs

 * @max: maximum number of allocatable binderfs binder devices

 */

struct binderfs_mount_opts {

    int max;

};

​

enum {

    Opt_max,

    Opt_err

};

​

static const match_table_t tokens = {

    { Opt_max, "max=%d" },

    { Opt_err, NULL     }

};

​

/**

 * binderfs_info - information about a binderfs mount

 * @ipc_ns:         The ipc namespace the binderfs mount belongs to.

 * @control_dentry: This records the dentry of this binderfs mount

 *                  binder-control device.

 * @root_uid:       uid that needs to be used when a new binder device is

 *                  created.

 * @root_gid:       gid that needs to be used when a new binder device is

 *                  created.

 * @mount_opts:     The mount options in use.

 * @device_count:   The current number of allocated binder devices.

 */

struct binderfs_info {

    struct ipc_namespace *ipc_ns;

    struct dentry *control_dentry;

    kuid_t root_uid;

    kgid_t root_gid;

    struct binderfs_mount_opts mount_opts;

    int device_count;

};

​

static inline struct binderfs_info *BINDERFS_I(const struct inode *inode)

{

    return inode->i_sb->s_fs_info;