#ifndef _LINUX_HUGETLB_H
  #define _LINUX_HUGETLB_H

  #include <linux/mm_types.h>

  #include <linux/fs.h>

  #include <linux/hugetlb_inline.h>

  struct ctl_table;
  struct user_struct;

  #ifdef CONFIG_HUGETLB_PAGE
  
  #include <linux/mempolicy.h>

  #include <linux/shm.h>

  #include <asm/tlbflush.h>

  int PageHuge(struct page *page);

  void reset_vma_resv_huge_pages(struct vm_area_struct *vma);

  int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
  int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
  int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);

  
  #ifdef CONFIG_NUMA
  int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
  					void __user *, size_t *, loff_t *);
  #endif

  int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);

  int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
  			struct page **, struct vm_area_struct **,
  			unsigned long *, int *, int, unsigned int flags);

  void unmap_hugepage_range(struct vm_area_struct *,
  			unsigned long, unsigned long, struct page *);
  void __unmap_hugepage_range(struct vm_area_struct *,
  			unsigned long, unsigned long, struct page *);

  int hugetlb_prefault(struct address_space *, struct vm_area_struct *);

  void hugetlb_report_meminfo(struct seq_file *);

  int hugetlb_report_node_meminfo(int, char *);

  unsigned long hugetlb_total_pages(void);

  int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,

  			unsigned long address, unsigned int flags);

  int hugetlb_reserve_pages(struct inode *inode, long from, long to,

  						struct vm_area_struct *vma,

  						vm_flags_t vm_flags);

  void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);

  int dequeue_hwpoisoned_huge_page(struct page *page);

  void copy_huge_page(struct page *dst, struct page *src);

  extern unsigned long hugepages_treat_as_movable;

  extern const unsigned long hugetlb_zero, hugetlb_infinity;
  extern int sysctl_hugetlb_shm_group;

  extern struct list_head huge_boot_pages;

  /* arch callbacks */

  pte_t *huge_pte_alloc(struct mm_struct *mm,
  			unsigned long addr, unsigned long sz);

  pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);

  int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);

  struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
  			      int write);
  struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
  				pmd_t *pmd, int write);

  struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
  				pud_t *pud, int write);

  int pmd_huge(pmd_t pmd);

  int pud_huge(pud_t pmd);

  void hugetlb_change_protection(struct vm_area_struct *vma,
  		unsigned long address, unsigned long end, pgprot_t newprot);

  #else /* !CONFIG_HUGETLB_PAGE */

  static inline int PageHuge(struct page *page)
  {
  	return 0;
  }

  static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
  {
  }

  static inline unsigned long hugetlb_total_pages(void)
  {
  	return 0;
  }

  #define follow_hugetlb_page(m,v,p,vs,a,b,i,w)	({ BUG(); 0; })

  #define follow_huge_addr(mm, addr, write)	ERR_PTR(-EINVAL)
  #define copy_hugetlb_page_range(src, dst, vma)	({ BUG(); 0; })
  #define hugetlb_prefault(mapping, vma)		({ BUG(); 0; })

  #define unmap_hugepage_range(vma, start, end, page)	BUG()

  static inline void hugetlb_report_meminfo(struct seq_file *m)
  {
  }

  #define hugetlb_report_node_meminfo(n, buf)	0
  #define follow_huge_pmd(mm, addr, pmd, write)	NULL

  #define follow_huge_pud(mm, addr, pud, write)	NULL

  #define prepare_hugepage_range(file, addr, len)	(-EINVAL)

  #define pmd_huge(x)	0

  #define pud_huge(x)	0

  #define is_hugepage_only_range(mm, addr, len)	0

  #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })

  #define hugetlb_fault(mm, vma, addr, flags)	({ BUG(); 0; })

  #define huge_pte_offset(mm, address)	0

  #define dequeue_hwpoisoned_huge_page(page)	0

  static inline void copy_huge_page(struct page *dst, struct page *src)
  {
  }

  #define hugetlb_change_protection(vma, address, end, newprot)

  #endif /* !CONFIG_HUGETLB_PAGE */

  #define HUGETLB_ANON_FILE "anon_hugepage"

  enum {
  	/*
  	 * The file will be used as an shm file so shmfs accounting rules
  	 * apply
  	 */
  	HUGETLB_SHMFS_INODE     = 1,

  	/*
  	 * The file is being created on the internal vfs mount and shmfs
  	 * accounting rules do not apply
  	 */
  	HUGETLB_ANONHUGE_INODE  = 2,

  };

  #ifdef CONFIG_HUGETLBFS
  struct hugetlbfs_config {
  	uid_t   uid;
  	gid_t   gid;
  	umode_t mode;
  	long	nr_blocks;
  	long	nr_inodes;

  	struct hstate *hstate;

  };
  
  struct hugetlbfs_sb_info {
  	long	max_blocks;   /* blocks allowed */
  	long	free_blocks;  /* blocks free */
  	long	max_inodes;   /* inodes allowed */
  	long	free_inodes;  /* inodes free */
  	spinlock_t	stat_lock;

  	struct hstate *hstate;

  };
  
  
  struct hugetlbfs_inode_info {
  	struct shared_policy policy;
  	struct inode vfs_inode;
  };
  
  static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
  {
  	return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
  }
  
  static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
  {
  	return sb->s_fs_info;
  }

  extern const struct file_operations hugetlbfs_file_operations;

  extern const struct vm_operations_struct hugetlb_vm_ops;

  struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,

  				struct user_struct **user, int creat_flags);

  int hugetlb_get_quota(struct address_space *mapping, long delta);
  void hugetlb_put_quota(struct address_space *mapping, long delta);

  
  static inline int is_file_hugepages(struct file *file)
  {

  	if (file->f_op == &hugetlbfs_file_operations)
  		return 1;
  	if (is_file_shm_hugepages(file))
  		return 1;
  
  	return 0;

  }
  
  static inline void set_file_hugepages(struct file *file)
  {
  	file->f_op = &hugetlbfs_file_operations;
  }
  #else /* !CONFIG_HUGETLBFS */

  #define is_file_hugepages(file)			0
  #define set_file_hugepages(file)		BUG()

  static inline struct file *hugetlb_file_setup(const char *name, size_t size,

  		vm_flags_t acctflag, struct user_struct **user, int creat_flags)

  {
  	return ERR_PTR(-ENOSYS);
  }

  
  #endif /* !CONFIG_HUGETLBFS */

  #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
  unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
  					unsigned long len, unsigned long pgoff,
  					unsigned long flags);
  #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */

  #ifdef CONFIG_HUGETLB_PAGE

  #define HSTATE_NAME_LEN 32

  /* Defines one hugetlb page size */
  struct hstate {

  	int next_nid_to_alloc;
  	int next_nid_to_free;

  	unsigned int order;
  	unsigned long mask;
  	unsigned long max_huge_pages;
  	unsigned long nr_huge_pages;
  	unsigned long free_huge_pages;
  	unsigned long resv_huge_pages;
  	unsigned long surplus_huge_pages;
  	unsigned long nr_overcommit_huge_pages;
  	struct list_head hugepage_freelists[MAX_NUMNODES];
  	unsigned int nr_huge_pages_node[MAX_NUMNODES];
  	unsigned int free_huge_pages_node[MAX_NUMNODES];
  	unsigned int surplus_huge_pages_node[MAX_NUMNODES];

  	char name[HSTATE_NAME_LEN];

  };

  struct huge_bootmem_page {
  	struct list_head list;
  	struct hstate *hstate;

  #ifdef CONFIG_HIGHMEM
  	phys_addr_t phys;
  #endif

  };

  struct page *alloc_huge_page_node(struct hstate *h, int nid);

  /* arch callback */
  int __init alloc_bootmem_huge_page(struct hstate *h);

  void __init hugetlb_add_hstate(unsigned order);
  struct hstate *size_to_hstate(unsigned long size);
  
  #ifndef HUGE_MAX_HSTATE
  #define HUGE_MAX_HSTATE 1
  #endif
  
  extern struct hstate hstates[HUGE_MAX_HSTATE];
  extern unsigned int default_hstate_idx;
  
  #define default_hstate (hstates[default_hstate_idx])

  static inline struct hstate *hstate_inode(struct inode *i)

  {

  	struct hugetlbfs_sb_info *hsb;
  	hsb = HUGETLBFS_SB(i->i_sb);
  	return hsb->hstate;

  }
  
  static inline struct hstate *hstate_file(struct file *f)
  {

  	return hstate_inode(f->f_dentry->d_inode);

  }

  static inline struct hstate *hstate_vma(struct vm_area_struct *vma)

  {

  	return hstate_file(vma->vm_file);

  }
  
  static inline unsigned long huge_page_size(struct hstate *h)
  {
  	return (unsigned long)PAGE_SIZE << h->order;
  }

  extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);

  extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);

  static inline unsigned long huge_page_mask(struct hstate *h)
  {
  	return h->mask;
  }
  
  static inline unsigned int huge_page_order(struct hstate *h)
  {
  	return h->order;
  }
  
  static inline unsigned huge_page_shift(struct hstate *h)
  {
  	return h->order + PAGE_SHIFT;
  }
  
  static inline unsigned int pages_per_huge_page(struct hstate *h)
  {
  	return 1 << h->order;
  }
  
  static inline unsigned int blocks_per_huge_page(struct hstate *h)
  {
  	return huge_page_size(h) / 512;
  }
  
  #include <asm/hugetlb.h>

  static inline struct hstate *page_hstate(struct page *page)
  {
  	return size_to_hstate(PAGE_SIZE << compound_order(page));
  }

  static inline unsigned hstate_index_to_shift(unsigned index)
  {
  	return hstates[index].order + PAGE_SHIFT;
  }

  #else
  struct hstate {};

  #define alloc_huge_page_node(h, nid) NULL

  #define alloc_bootmem_huge_page(h) NULL

  #define hstate_file(f) NULL
  #define hstate_vma(v) NULL
  #define hstate_inode(i) NULL
  #define huge_page_size(h) PAGE_SIZE
  #define huge_page_mask(h) PAGE_MASK

  #define vma_kernel_pagesize(v) PAGE_SIZE

  #define vma_mmu_pagesize(v) PAGE_SIZE

  #define huge_page_order(h) 0
  #define huge_page_shift(h) PAGE_SHIFT

  static inline unsigned int pages_per_huge_page(struct hstate *h)
  {
  	return 1;
  }

  #define hstate_index_to_shift(index) 0

  #endif

  #endif /* _LINUX_HUGETLB_H */