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
   8 struct ctl_table;
   9
  10 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
  11 {
  12         return vma->vm_flags & VM_HUGETLB;
  13 }
  14
  15 int hugetlb_sysctl_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
  16 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
  17 int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, struct page **, struct vm_area_struct **, unsigned long *, int *, int);
  18 void zap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
  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 int is_hugepage_mem_enough(size_t);
  24 unsigned long hugetlb_total_pages(void);
  25 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
  26                               int write);
  27 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
  28                                 pmd_t *pmd, int write);
  29 int is_aligned_hugepage_range(unsigned long addr, unsigned long len);
  30 int pmd_huge(pmd_t pmd);
  31 struct page *alloc_huge_page(void);
  32 void free_huge_page(struct page *);
  33
  34 extern unsigned long max_huge_pages;
  35 extern const unsigned long hugetlb_zero, hugetlb_infinity;
  36 extern int sysctl_hugetlb_shm_group;
  37
  38 #ifndef ARCH_HAS_HUGEPAGE_ONLY_RANGE
  39 #define is_hugepage_only_range(mm, addr, len)   0
  40 #define hugetlb_free_pgtables(tlb, prev, start, end) do { } while (0)
  41 #endif
  42
  43 #ifndef ARCH_HAS_PREPARE_HUGEPAGE_RANGE
  44 #define prepare_hugepage_range(addr, len)       \
  45         is_aligned_hugepage_range(addr, len)
  46 #else
  47 int prepare_hugepage_range(unsigned long addr, unsigned long len);
  48 #endif
  49
  50 #else /* !CONFIG_HUGETLB_PAGE */
  51
  52 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
  53 {
  54         return 0;
  55 }
  56 static inline unsigned long hugetlb_total_pages(void)
  57 {
  58         return 0;
  59 }
  60
  61 #define follow_hugetlb_page(m,v,p,vs,a,b,i)     ({ BUG(); 0; })
  62 #define follow_huge_addr(mm, addr, write)       ERR_PTR(-EINVAL)
  63 #define copy_hugetlb_page_range(src, dst, vma)  ({ BUG(); 0; })
  64 #define hugetlb_prefault(mapping, vma)          ({ BUG(); 0; })
  65 #define zap_hugepage_range(vma, start, len)     BUG()
  66 #define unmap_hugepage_range(vma, start, end)   BUG()
  67 #define is_hugepage_mem_enough(size)            0
  68 #define hugetlb_report_meminfo(buf)             0
  69 #define hugetlb_report_node_meminfo(n, buf)     0
  70 #define follow_huge_pmd(mm, addr, pmd, write)   NULL
  71 #define is_aligned_hugepage_range(addr, len)    0
  72 #define prepare_hugepage_range(addr, len)       (-EINVAL)
  73 #define pmd_huge(x)     0
  74 #define is_hugepage_only_range(mm, addr, len)   0
  75 #define hugetlb_free_pgtables(tlb, prev, start, end) do { } while (0)
  76 #define alloc_huge_page()                       ({ NULL; })
  77 #define free_huge_page(p)                       ({ (void)(p); BUG(); })
  78
  79 #ifndef HPAGE_MASK
  80 #define HPAGE_MASK      0               /* Keep the compiler happy */
  81 #define HPAGE_SIZE      0
  82 #endif
  83
  84 #endif /* !CONFIG_HUGETLB_PAGE */
  85
  86 #ifdef CONFIG_HUGETLBFS
  87 struct hugetlbfs_config {
  88         uid_t   uid;
  89         gid_t   gid;
  90         umode_t mode;
  91         long    nr_blocks;
  92         long    nr_inodes;
  93 };
  94
  95 struct hugetlbfs_sb_info {
  96         long    max_blocks;   /* blocks allowed */
  97         long    free_blocks;  /* blocks free */
  98         long    max_inodes;   /* inodes allowed */
  99         long    free_inodes;  /* inodes free */
 100         spinlock_t      stat_lock;
 101 };
 102
 103
 104 struct hugetlbfs_inode_info {
 105         struct shared_policy policy;
 106         struct inode vfs_inode;
 107 };
 108
 109 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
 110 {
 111         return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
 112 }
 113
 114 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
 115 {
 116         return sb->s_fs_info;
 117 }
 118
 119 extern struct file_operations hugetlbfs_file_operations;
 120 extern struct vm_operations_struct hugetlb_vm_ops;
 121 struct file *hugetlb_zero_setup(size_t);
 122 int hugetlb_get_quota(struct address_space *mapping);
 123 void hugetlb_put_quota(struct address_space *mapping);
 124
 125 static inline int is_file_hugepages(struct file *file)
 126 {
 127         return file->f_op == &hugetlbfs_file_operations;
 128 }
 129
 130 static inline void set_file_hugepages(struct file *file)
 131 {
 132         file->f_op = &hugetlbfs_file_operations;
 133 }
 134 #else /* !CONFIG_HUGETLBFS */
 135
 136 #define is_file_hugepages(file)         0
 137 #define set_file_hugepages(file)        BUG()
 138 #define hugetlb_zero_setup(size)        ERR_PTR(-ENOSYS)
 139
 140 #endif /* !CONFIG_HUGETLBFS */
 141
 142 #endif /* _LINUX_HUGETLB_H */