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[linux-2.6.git] / 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 *);
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
37 #ifndef ARCH_HAS_HUGEPAGE_ONLY_RANGE
38 #define is_hugepage_only_range(addr, len)       0
39 #define hugetlb_free_pgtables(tlb, prev, start, end) do { } while (0)
40 #endif
41
42 #ifndef ARCH_HAS_PREPARE_HUGEPAGE_RANGE
43 #define prepare_hugepage_range(addr, len)       \
44         is_aligned_hugepage_range(addr, len)
45 #else
46 int prepare_hugepage_range(unsigned long addr, unsigned long len);
47 #endif
48
49 #else /* !CONFIG_HUGETLB_PAGE */
50
51 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
52 {
53         return 0;
54 }
55 static inline unsigned long hugetlb_total_pages(void)
56 {
57         return 0;
58 }
59
60 #define follow_hugetlb_page(m,v,p,vs,a,b,i)     ({ BUG(); 0; })
61 #define follow_huge_addr(mm, addr, write)       ERR_PTR(-EINVAL)
62 #define copy_hugetlb_page_range(src, dst, vma)  ({ BUG(); 0; })
63 #define hugetlb_prefault(mapping, vma)          ({ BUG(); 0; })
64 #define zap_hugepage_range(vma, start, len)     BUG()
65 #define unmap_hugepage_range(vma, start, end)   BUG()
66 #define is_hugepage_mem_enough(size)            0
67 #define hugetlb_report_meminfo(buf)             0
68 #define hugetlb_report_node_meminfo(n, buf)     0
69 #define follow_huge_pmd(mm, addr, pmd, write)   NULL
70 #define is_aligned_hugepage_range(addr, len)    0
71 #define prepare_hugepage_range(addr, len)       (-EINVAL)
72 #define pmd_huge(x)     0
73 #define is_hugepage_only_range(addr, len)       0
74 #define hugetlb_free_pgtables(tlb, prev, start, end) do { } while (0)
75 #define alloc_huge_page()                       ({ NULL; })
76 #define free_huge_page(p)                       ({ (void)(p); BUG(); })
77
78 #ifndef HPAGE_MASK
79 #define HPAGE_MASK      0               /* Keep the compiler happy */
80 #define HPAGE_SIZE      0
81 #endif
82
83 #endif /* !CONFIG_HUGETLB_PAGE */
84
85 #ifdef CONFIG_HUGETLBFS
86 struct hugetlbfs_config {
87         uid_t   uid;
88         gid_t   gid;
89         umode_t mode;
90         long    nr_blocks;
91         long    nr_inodes;
92 };
93
94 struct hugetlbfs_sb_info {
95         long    max_blocks;   /* blocks allowed */
96         long    free_blocks;  /* blocks free */
97         long    max_inodes;   /* inodes allowed */
98         long    free_inodes;  /* inodes free */
99         spinlock_t      stat_lock;
100 };
101
102
103 struct hugetlbfs_inode_info {
104         struct shared_policy policy;
105         struct inode vfs_inode;
106 };
107
108 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
109 {
110         return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
111 }
112
113 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
114 {
115         return sb->s_fs_info;
116 }
117
118 extern struct file_operations hugetlbfs_file_operations;
119 extern struct vm_operations_struct hugetlb_vm_ops;
120 struct file *hugetlb_zero_setup(size_t);
121 int hugetlb_get_quota(struct address_space *mapping);
122 void hugetlb_put_quota(struct address_space *mapping);
123
124 static inline int is_file_hugepages(struct file *file)
125 {
126         return file->f_op == &hugetlbfs_file_operations;
127 }
128
129 static inline void set_file_hugepages(struct file *file)
130 {
131         file->f_op = &hugetlbfs_file_operations;
132 }
133 #else /* !CONFIG_HUGETLBFS */
134
135 #define is_file_hugepages(file)         0
136 #define set_file_hugepages(file)        BUG()
137 #define hugetlb_zero_setup(size)        ERR_PTR(-ENOSYS)
138
139 #endif /* !CONFIG_HUGETLBFS */
140
141 #endif /* _LINUX_HUGETLB_H */