include/linux/hugetlb.h

   1 #ifndef _LINUX_HUGETLB_H
   2 #define _LINUX_HUGETLB_H
   3
   4 #include <linux/fs.h>
   5
   6 #ifdef CONFIG_HUGETLB_PAGE
   7
   8 #include <linux/mempolicy.h>
   9 #include <linux/shm.h>
  10 #include <asm/tlbflush.h>
  11 #include <asm/hugetlb.h>
  12
  13 struct ctl_table;
  14
  15 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
  16 {
  17         return vma->vm_flags & VM_HUGETLB;
  18 }
  19
  20 int hugetlb_sysctl_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
  21 int hugetlb_overcommit_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
  22 int hugetlb_treat_movable_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
  23 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
  24 int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, struct page **, struct vm_area_struct **, unsigned long *, int *, int, int);
  25 void unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
  26 void __unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
  27 int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
  28 int hugetlb_report_meminfo(char *);
  29 int hugetlb_report_node_meminfo(int, char *);
  30 unsigned long hugetlb_total_pages(void);
  31 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
  32                         unsigned long address, int write_access);
  33 int hugetlb_reserve_pages(struct inode *inode, long from, long to);
  34 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
  35
  36 extern unsigned long max_huge_pages;
  37 extern unsigned long sysctl_overcommit_huge_pages;
  38 extern unsigned long hugepages_treat_as_movable;
  39 extern const unsigned long hugetlb_zero, hugetlb_infinity;
  40 extern int sysctl_hugetlb_shm_group;
  41
  42 /* arch callbacks */
  43
  44 pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr);
  45 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
  46 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
  47 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
  48                               int write);
  49 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
  50                                 pmd_t *pmd, int write);
  51 int pmd_huge(pmd_t pmd);
  52 void hugetlb_change_protection(struct vm_area_struct *vma,
  53                 unsigned long address, unsigned long end, pgprot_t newprot);
  54
  55 #else /* !CONFIG_HUGETLB_PAGE */
  56
  57 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
  58 {
  59         return 0;
  60 }
  61 static inline unsigned long hugetlb_total_pages(void)
  62 {
  63         return 0;
  64 }
  65
  66 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w)   ({ BUG(); 0; })
  67 #define follow_huge_addr(mm, addr, write)       ERR_PTR(-EINVAL)
  68 #define copy_hugetlb_page_range(src, dst, vma)  ({ BUG(); 0; })
  69 #define hugetlb_prefault(mapping, vma)          ({ BUG(); 0; })
  70 #define unmap_hugepage_range(vma, start, end)   BUG()
  71 #define hugetlb_report_meminfo(buf)             0
  72 #define hugetlb_report_node_meminfo(n, buf)     0
  73 #define follow_huge_pmd(mm, addr, pmd, write)   NULL
  74 #define prepare_hugepage_range(addr,len)        (-EINVAL)
  75 #define pmd_huge(x)     0
  76 #define is_hugepage_only_range(mm, addr, len)   0
  77 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
  78 #define hugetlb_fault(mm, vma, addr, write)     ({ BUG(); 0; })
  79
  80 #define hugetlb_change_protection(vma, address, end, newprot)
  81
  82 #ifndef HPAGE_MASK
  83 #define HPAGE_MASK      PAGE_MASK               /* Keep the compiler happy */
  84 #define HPAGE_SIZE      PAGE_SIZE
  85 #endif
  86
  87 #endif /* !CONFIG_HUGETLB_PAGE */
  88
  89 #ifdef CONFIG_HUGETLBFS
  90 struct hugetlbfs_config {
  91         uid_t   uid;
  92         gid_t   gid;
  93         umode_t mode;
  94         long    nr_blocks;
  95         long    nr_inodes;
  96 };
  97
  98 struct hugetlbfs_sb_info {
  99         long    max_blocks;   /* blocks allowed */
 100         long    free_blocks;  /* blocks free */
 101         long    max_inodes;   /* inodes allowed */
 102         long    free_inodes;  /* inodes free */
 103         spinlock_t      stat_lock;
 104 };
 105
 106
 107 struct hugetlbfs_inode_info {
 108         struct shared_policy policy;
 109         struct inode vfs_inode;
 110 };
 111
 112 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
 113 {
 114         return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
 115 }
 116
 117 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
 118 {
 119         return sb->s_fs_info;
 120 }
 121
 122 extern const struct file_operations hugetlbfs_file_operations;
 123 extern struct vm_operations_struct hugetlb_vm_ops;
 124 struct file *hugetlb_file_setup(const char *name, size_t);
 125 int hugetlb_get_quota(struct address_space *mapping, long delta);
 126 void hugetlb_put_quota(struct address_space *mapping, long delta);
 127
 128 #define BLOCKS_PER_HUGEPAGE     (HPAGE_SIZE / 512)
 129
 130 static inline int is_file_hugepages(struct file *file)
 131 {
 132         if (file->f_op == &hugetlbfs_file_operations)
 133                 return 1;
 134         if (is_file_shm_hugepages(file))
 135                 return 1;
 136
 137         return 0;
 138 }
 139
 140 static inline void set_file_hugepages(struct file *file)
 141 {
 142         file->f_op = &hugetlbfs_file_operations;
 143 }
 144 #else /* !CONFIG_HUGETLBFS */
 145
 146 #define is_file_hugepages(file)         0
 147 #define set_file_hugepages(file)        BUG()
 148 #define hugetlb_file_setup(name,size)   ERR_PTR(-ENOSYS)
 149
 150 #endif /* !CONFIG_HUGETLBFS */
 151
 152 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
 153 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
 154                                         unsigned long len, unsigned long pgoff,
 155                                         unsigned long flags);
 156 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
 157
 158 #endif /* _LINUX_HUGETLB_H */