linux-imx

/*

 * hugetlbpage-backed filesystem.  Based on ramfs.

 *

 * Nadia Yvette Chambers, 2002

 *

 * Copyright (C) 2002 Linus Torvalds.

 * License: GPL

 */

​

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

​

#include <linux/thread_info.h>

#include <asm/current.h>

#include <linux/sched/signal.h>     /* remove ASAP */

#include <linux/falloc.h>

#include <linux/fs.h>

#include <linux/mount.h>

#include <linux/file.h>

#include <linux/kernel.h>

#include <linux/writeback.h>

#include <linux/pagemap.h>

#include <linux/highmem.h>

#include <linux/init.h>

#include <linux/string.h>

#include <linux/capability.h>

#include <linux/ctype.h>

#include <linux/backing-dev.h>

#include <linux/hugetlb.h>

#include <linux/pagevec.h>

#include <linux/fs_parser.h>

#include <linux/mman.h>

#include <linux/slab.h>

#include <linux/dnotify.h>

#include <linux/statfs.h>

#include <linux/security.h>

#include <linux/magic.h>

#include <linux/migrate.h>

#include <linux/uio.h>

​

#include <linux/uaccess.h>

​

static const struct super_operations hugetlbfs_ops;

static const struct address_space_operations hugetlbfs_aops;

const struct file_operations hugetlbfs_file_operations;

static const struct inode_operations hugetlbfs_dir_inode_operations;

static const struct inode_operations hugetlbfs_inode_operations;

​

enum hugetlbfs_size_type { NO_SIZE, SIZE_STD, SIZE_PERCENT };

​

struct hugetlbfs_fs_context {

    struct hstate       *hstate;

    unsigned long long  max_size_opt;

    unsigned long long  min_size_opt;

    long            max_hpages;

    long            nr_inodes;

    long            min_hpages;

    enum hugetlbfs_size_type max_val_type;

    enum hugetlbfs_size_type min_val_type;

    kuid_t          uid;

    kgid_t          gid;

    umode_t         mode;

};

​

int sysctl_hugetlb_shm_group;

​

enum hugetlb_param {

    Opt_gid,

    Opt_min_size,

    Opt_mode,

    Opt_nr_inodes,

    Opt_pagesize,

    Opt_size,

    Opt_uid,

};

​

static const struct fs_parameter_spec hugetlb_param_specs[] = {

    fsparam_u32   ("gid",       Opt_gid),

    fsparam_string("min_size",  Opt_min_size),

    fsparam_u32   ("mode",      Opt_mode),

    fsparam_string("nr_inodes", Opt_nr_inodes),

    fsparam_string("pagesize",  Opt_pagesize),

    fsparam_string("size",      Opt_size),

    fsparam_u32   ("uid",       Opt_uid),

    {}

};

​

static const struct fs_parameter_description hugetlb_fs_parameters = {

    .name       = "hugetlbfs",

    .specs      = hugetlb_param_specs,

};

​

#ifdef CONFIG_NUMA