linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 * linux/ipc/shm.c

 * Copyright (C) 1992, 1993 Krishna Balasubramanian

 *   Many improvements/fixes by Bruno Haible.

 * Replaced `struct shm_desc' by `struct vm_area_struct', July 1994.

 * Fixed the shm swap deallocation (shm_unuse()), August 1998 Andrea Arcangeli.

 *

 * /proc/sysvipc/shm support (c) 1999 Dragos Acostachioaie <dragos@iname.com>

 * BIGMEM support, Andrea Arcangeli <andrea@suse.de>

 * SMP thread shm, Jean-Luc Boyard <jean-luc.boyard@siemens.fr>

 * HIGHMEM support, Ingo Molnar <mingo@redhat.com>

 * Make shmmax, shmall, shmmni sysctl'able, Christoph Rohland <cr@sap.com>

 * Shared /dev/zero support, Kanoj Sarcar <kanoj@sgi.com>

 * Move the mm functionality over to mm/shmem.c, Christoph Rohland <cr@sap.com>

 *

 * support for audit of ipc object properties and permission changes

 * Dustin Kirkland <dustin.kirkland@us.ibm.com>

 *

 * namespaces support

 * OpenVZ, SWsoft Inc.

 * Pavel Emelianov <xemul@openvz.org>

 *

 * Better ipc lock (kern_ipc_perm.lock) handling

 * Davidlohr Bueso <davidlohr.bueso@hp.com>, June 2013.

 */

​

#include <linux/slab.h>

#include <linux/mm.h>

#include <linux/hugetlb.h>

#include <linux/shm.h>

#include <linux/init.h>

#include <linux/file.h>

#include <linux/mman.h>

#include <linux/shmem_fs.h>

#include <linux/security.h>

#include <linux/syscalls.h>

#include <linux/audit.h>

#include <linux/capability.h>

#include <linux/ptrace.h>

#include <linux/seq_file.h>

#include <linux/rwsem.h>

#include <linux/nsproxy.h>

#include <linux/mount.h>

#include <linux/ipc_namespace.h>

#include <linux/rhashtable.h>

​

#include <linux/uaccess.h>

​

#include "util.h"

​

struct shmid_kernel /* private to the kernel */

{

    struct kern_ipc_perm    shm_perm;

    struct file     *shm_file;

    unsigned long       shm_nattch;

    unsigned long       shm_segsz;

    time64_t        shm_atim;

    time64_t        shm_dtim;

    time64_t        shm_ctim;

    struct pid      *shm_cprid;

    struct pid      *shm_lprid;

    struct user_struct  *mlock_user;