linux-imx

/*

 * Resizable virtual memory filesystem for Linux.

 *

 * Copyright (C) 2000 Linus Torvalds.

 *       2000 Transmeta Corp.

 *       2000-2001 Christoph Rohland

 *       2000-2001 SAP AG

 *       2002 Red Hat Inc.

 * Copyright (C) 2002-2011 Hugh Dickins.

 * Copyright (C) 2011 Google Inc.

 * Copyright (C) 2002-2005 VERITAS Software Corporation.

 * Copyright (C) 2004 Andi Kleen, SuSE Labs

 *

 * Extended attribute support for tmpfs:

 * Copyright (c) 2004, Luke Kenneth Casson Leighton <lkcl@lkcl.net>

 * Copyright (c) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>

 *

 * tiny-shmem:

 * Copyright (c) 2004, 2008 Matt Mackall <mpm@selenic.com>

 *

 * This file is released under the GPL.

 */

​

#include <linux/fs.h>

#include <linux/init.h>

#include <linux/vfs.h>

#include <linux/mount.h>

#include <linux/ramfs.h>

#include <linux/pagemap.h>

#include <linux/file.h>

#include <linux/mm.h>

#include <linux/random.h>

#include <linux/sched/signal.h>

#include <linux/export.h>

#include <linux/swap.h>

#include <linux/uio.h>

#include <linux/khugepaged.h>

#include <linux/hugetlb.h>

#include <linux/frontswap.h>

​

#include <asm/tlbflush.h> /* for arch/microblaze update_mmu_cache() */

​

static struct vfsmount *shm_mnt;

​

#ifdef CONFIG_SHMEM

/*

 * This virtual memory filesystem is heavily based on the ramfs. It

 * extends ramfs by the ability to use swap and honor resource limits

 * which makes it a completely usable filesystem.

 */

​

#include <linux/xattr.h>

#include <linux/exportfs.h>

#include <linux/posix_acl.h>

#include <linux/posix_acl_xattr.h>

#include <linux/mman.h>

#include <linux/string.h>

#include <linux/slab.h>

#include <linux/backing-dev.h>

#include <linux/shmem_fs.h>

#include <linux/writeback.h>

#include <linux/blkdev.h>

#include <linux/pagevec.h>

#include <linux/percpu_counter.h>

#include <linux/falloc.h>

#include <linux/splice.h>

#include <linux/security.h>

#include <linux/swapops.h>

#include <linux/mempolicy.h>

#include <linux/namei.h>

#include <linux/ctype.h>

#include <linux/migrate.h>

#include <linux/highmem.h>

#include <linux/seq_file.h>

#include <linux/magic.h>

#include <linux/syscalls.h>

#include <linux/fcntl.h>

#include <uapi/linux/memfd.h>

#include <linux/userfaultfd_k.h>

#include <linux/rmap.h>

#include <linux/uuid.h>

​

#include <linux/uaccess.h>

#include <asm/pgtable.h>

​

#include "internal.h"

​

#define BLOCKS_PER_PAGE  (PAGE_SIZE/512)

#define VM_ACCT(size)    (PAGE_ALIGN(size) >> PAGE_SHIFT)

​

/* Pretend that each entry is of this size in directory's i_size */

#define BOGO_DIRENT_SIZE 20