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