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