[PATCH] hugepage: Make {alloc,free}_huge_page() local
[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 #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 */