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_pgd_range(tlb, addr, end, floor, ceiling) \
  41                                                 do { } while (0)
  42 #endif
  43
  44 #ifndef ARCH_HAS_PREPARE_HUGEPAGE_RANGE
  45 #define prepare_hugepage_range(addr, len)       \
  46         is_aligned_hugepage_range(addr, len)
  47 #else
  48 int prepare_hugepage_range(unsigned long addr, unsigned long len);
  49 #endif
  50
  51 #else /* !CONFIG_HUGETLB_PAGE */
  52
  53 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
  54 {
  55         return 0;
  56 }
  57 static inline unsigned long hugetlb_total_pages(void)
  58 {
  59         return 0;
  60 }
  61
  62 #define follow_hugetlb_page(m,v,p,vs,a,b,i)     ({ BUG(); 0; })
  63 #define follow_huge_addr(mm, addr, write)       ERR_PTR(-EINVAL)
  64 #define copy_hugetlb_page_range(src, dst, vma)  ({ BUG(); 0; })
  65 #define hugetlb_prefault(mapping, vma)          ({ BUG(); 0; })
  66 #define zap_hugepage_range(vma, start, len)     BUG()
  67 #define unmap_hugepage_range(vma, start, end)   BUG()
  68 #define is_hugepage_mem_enough(size)            0
  69 #define hugetlb_report_meminfo(buf)             0
  70 #define hugetlb_report_node_meminfo(n, buf)     0
  71 #define follow_huge_pmd(mm, addr, pmd, write)   NULL
  72 #define is_aligned_hugepage_range(addr, len)    0
  73 #define prepare_hugepage_range(addr, len)       (-EINVAL)
  74 #define pmd_huge(x)     0
  75 #define is_hugepage_only_range(mm, addr, len)   0
  76 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) \
  77                                                 do { } while (0)
  78 #define alloc_huge_page()                       ({ NULL; })
  79 #define free_huge_page(p)                       ({ (void)(p); BUG(); })
  80
  81 #ifndef HPAGE_MASK
  82 #define HPAGE_MASK      0               /* Keep the compiler happy */
  83 #define HPAGE_SIZE      0
  84 #endif
  85
  86 #endif /* !CONFIG_HUGETLB_PAGE */
  87
  88 #ifdef CONFIG_HUGETLBFS
  89 struct hugetlbfs_config {
  90         uid_t   uid;
  91         gid_t   gid;
  92         umode_t mode;
  93         long    nr_blocks;
  94         long    nr_inodes;
  95 };
  96
  97 struct hugetlbfs_sb_info {
  98         long    max_blocks;   /* blocks allowed */
  99         long    free_blocks;  /* blocks free */
 100         long    max_inodes;   /* inodes allowed */
 101         long    free_inodes;  /* inodes free */
 102         spinlock_t      stat_lock;
 103 };
 104
 105
 106 struct hugetlbfs_inode_info {
 107         struct shared_policy policy;
 108         struct inode vfs_inode;
 109 };
 110
 111 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
 112 {
 113         return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
 114 }
 115
 116 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
 117 {
 118         return sb->s_fs_info;
 119 }
 120
 121 extern struct file_operations hugetlbfs_file_operations;
 122 extern struct vm_operations_struct hugetlb_vm_ops;
 123 struct file *hugetlb_zero_setup(size_t);
 124 int hugetlb_get_quota(struct address_space *mapping);
 125 void hugetlb_put_quota(struct address_space *mapping);
 126
 127 static inline int is_file_hugepages(struct file *file)
 128 {
 129         return file->f_op == &hugetlbfs_file_operations;
 130 }
 131
 132 static inline void set_file_hugepages(struct file *file)
 133 {
 134         file->f_op = &hugetlbfs_file_operations;
 135 }
 136 #else /* !CONFIG_HUGETLBFS */
 137
 138 #define is_file_hugepages(file)         0
 139 #define set_file_hugepages(file)        BUG()
 140 #define hugetlb_zero_setup(size)        ERR_PTR(-ENOSYS)
 141
 142 #endif /* !CONFIG_HUGETLBFS */
 143
 144 #endif /* _LINUX_HUGETLB_H */