err.no Git - linux-2.6/blob - include/linux/hugetlb.h

   1 #ifndef _LINUX_HUGETLB_H
   2 #define _LINUX_HUGETLB_H
   3
   4 #ifdef CONFIG_HUGETLB_PAGE
   5
   6 #include <linux/mempolicy.h>
   7 #include <asm/tlbflush.h>
   8
   9 struct ctl_table;
  10
  11 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
  12 {
  13         return vma->vm_flags & VM_HUGETLB;
  14 }
  15
  16 int hugetlb_sysctl_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
  17 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
  18 int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, struct page **, struct vm_area_struct **, unsigned long *, int *, int);
  19 void unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
  20 int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
  21 int hugetlb_report_meminfo(char *);
  22 int hugetlb_report_node_meminfo(int, char *);
  23 unsigned long hugetlb_total_pages(void);
  24 struct page *alloc_huge_page(struct vm_area_struct *, unsigned long);
  25 void free_huge_page(struct page *);
  26 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
  27                         unsigned long address, int write_access);
  28
  29 extern unsigned long max_huge_pages;
  30 extern const unsigned long hugetlb_zero, hugetlb_infinity;
  31 extern int sysctl_hugetlb_shm_group;
  32
  33 /* arch callbacks */
  34
  35 pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr);
  36 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
  37 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
  38                               int write);
  39 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
  40                                 pmd_t *pmd, int write);
  41 int is_aligned_hugepage_range(unsigned long addr, unsigned long len);
  42 int pmd_huge(pmd_t pmd);
  43 void hugetlb_change_protection(struct vm_area_struct *vma,
  44                 unsigned long address, unsigned long end, pgprot_t newprot);
  45
  46 #ifndef ARCH_HAS_HUGEPAGE_ONLY_RANGE
  47 #define is_hugepage_only_range(mm, addr, len)   0
  48 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) \
  49                                                 do { } while (0)
  50 #endif
  51
  52 #ifndef ARCH_HAS_PREPARE_HUGEPAGE_RANGE
  53 #define prepare_hugepage_range(addr, len)       \
  54         is_aligned_hugepage_range(addr, len)
  55 #else
  56 int prepare_hugepage_range(unsigned long addr, unsigned long len);
  57 #endif
  58
  59 #ifndef ARCH_HAS_SETCLEAR_HUGE_PTE
  60 #define set_huge_pte_at(mm, addr, ptep, pte)    set_pte_at(mm, addr, ptep, pte)
  61 #define huge_ptep_get_and_clear(mm, addr, ptep) ptep_get_and_clear(mm, addr, ptep)
  62 #else
  63 void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
  64                      pte_t *ptep, pte_t pte);
  65 pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
  66                               pte_t *ptep);
  67 #endif
  68
  69 #ifndef ARCH_HAS_HUGETLB_PREFAULT_HOOK
  70 #define hugetlb_prefault_arch_hook(mm)          do { } while (0)
  71 #else
  72 void hugetlb_prefault_arch_hook(struct mm_struct *mm);
  73 #endif
  74
  75 #else /* !CONFIG_HUGETLB_PAGE */
  76
  77 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
  78 {
  79         return 0;
  80 }
  81 static inline unsigned long hugetlb_total_pages(void)
  82 {
  83         return 0;
  84 }
  85
  86 #define follow_hugetlb_page(m,v,p,vs,a,b,i)     ({ BUG(); 0; })
  87 #define follow_huge_addr(mm, addr, write)       ERR_PTR(-EINVAL)
  88 #define copy_hugetlb_page_range(src, dst, vma)  ({ BUG(); 0; })
  89 #define hugetlb_prefault(mapping, vma)          ({ BUG(); 0; })
  90 #define unmap_hugepage_range(vma, start, end)   BUG()
  91 #define hugetlb_report_meminfo(buf)             0
  92 #define hugetlb_report_node_meminfo(n, buf)     0
  93 #define follow_huge_pmd(mm, addr, pmd, write)   NULL
  94 #define is_aligned_hugepage_range(addr, len)    0
  95 #define prepare_hugepage_range(addr, len)       (-EINVAL)
  96 #define pmd_huge(x)     0
  97 #define is_hugepage_only_range(mm, addr, len)   0
  98 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) \
  99                                                 do { } while (0)
 100 #define alloc_huge_page(vma, addr)              ({ NULL; })
 101 #define free_huge_page(p)                       ({ (void)(p); BUG(); })
 102 #define hugetlb_fault(mm, vma, addr, write)     ({ BUG(); 0; })
 103
 104 #define hugetlb_change_protection(vma, address, end, newprot)
 105
 106 #ifndef HPAGE_MASK
 107 #define HPAGE_MASK      PAGE_MASK               /* Keep the compiler happy */
 108 #define HPAGE_SIZE      PAGE_SIZE
 109 #endif
 110
 111 #endif /* !CONFIG_HUGETLB_PAGE */
 112
 113 #ifdef CONFIG_HUGETLBFS
 114 struct hugetlbfs_config {
 115         uid_t   uid;
 116         gid_t   gid;
 117         umode_t mode;
 118         long    nr_blocks;
 119         long    nr_inodes;
 120 };
 121
 122 struct hugetlbfs_sb_info {
 123         long    max_blocks;   /* blocks allowed */
 124         long    free_blocks;  /* blocks free */
 125         long    max_inodes;   /* inodes allowed */
 126         long    free_inodes;  /* inodes free */
 127         spinlock_t      stat_lock;
 128 };
 129
 130
 131 struct hugetlbfs_inode_info {
 132         struct shared_policy policy;
 133         /* Protected by the (global) hugetlb_lock */
 134         unsigned long prereserved_hpages;
 135         struct inode vfs_inode;
 136 };
 137
 138 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
 139 {
 140         return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
 141 }
 142
 143 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
 144 {
 145         return sb->s_fs_info;
 146 }
 147
 148 extern struct file_operations hugetlbfs_file_operations;
 149 extern struct vm_operations_struct hugetlb_vm_ops;
 150 struct file *hugetlb_zero_setup(size_t);
 151 int hugetlb_extend_reservation(struct hugetlbfs_inode_info *info,
 152                                unsigned long atleast_hpages);
 153 void hugetlb_truncate_reservation(struct hugetlbfs_inode_info *info,
 154                                   unsigned long atmost_hpages);
 155 int hugetlb_get_quota(struct address_space *mapping);
 156 void hugetlb_put_quota(struct address_space *mapping);
 157
 158 static inline int is_file_hugepages(struct file *file)
 159 {
 160         return file->f_op == &hugetlbfs_file_operations;
 161 }
 162
 163 static inline void set_file_hugepages(struct file *file)
 164 {
 165         file->f_op = &hugetlbfs_file_operations;
 166 }
 167 #else /* !CONFIG_HUGETLBFS */
 168
 169 #define is_file_hugepages(file)         0
 170 #define set_file_hugepages(file)        BUG()
 171 #define hugetlb_zero_setup(size)        ERR_PTR(-ENOSYS)
 172
 173 #endif /* !CONFIG_HUGETLBFS */
 174
 175 #endif /* _LINUX_HUGETLB_H */