[PATCH] Fix handling spurious page fault for hugetlb region
[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 zap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
20 void unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
21 int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
22 int hugetlb_report_meminfo(char *);
23 int hugetlb_report_node_meminfo(int, char *);
24 int is_hugepage_mem_enough(size_t);
25 unsigned long hugetlb_total_pages(void);
26 struct page *alloc_huge_page(void);
27 void free_huge_page(struct page *);
28 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
29                         unsigned long address, int write_access);
30
31 extern unsigned long max_huge_pages;
32 extern const unsigned long hugetlb_zero, hugetlb_infinity;
33 extern int sysctl_hugetlb_shm_group;
34
35 /* arch callbacks */
36
37 pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr);
38 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
39 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
40                               int write);
41 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
42                                 pmd_t *pmd, int write);
43 int is_aligned_hugepage_range(unsigned long addr, unsigned long len);
44 int pmd_huge(pmd_t pmd);
45
46 #ifndef ARCH_HAS_HUGEPAGE_ONLY_RANGE
47 #define is_hugepage_only_range(mm, addr, len)   0
48 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) \
49                                                 do { } while (0)
50 #endif
51
52 #ifndef ARCH_HAS_PREPARE_HUGEPAGE_RANGE
53 #define prepare_hugepage_range(addr, len)       \
54         is_aligned_hugepage_range(addr, len)
55 #else
56 int prepare_hugepage_range(unsigned long addr, unsigned long len);
57 #endif
58
59 #ifndef ARCH_HAS_SETCLEAR_HUGE_PTE
60 #define set_huge_pte_at(mm, addr, ptep, pte)    set_pte_at(mm, addr, ptep, pte)
61 #define huge_ptep_get_and_clear(mm, addr, ptep) ptep_get_and_clear(mm, addr, ptep)
62 #else
63 void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
64                      pte_t *ptep, pte_t pte);
65 pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
66                               pte_t *ptep);
67 #endif
68
69 #ifndef ARCH_HAS_HUGETLB_PREFAULT_HOOK
70 #define hugetlb_prefault_arch_hook(mm)          do { } while (0)
71 #else
72 void hugetlb_prefault_arch_hook(struct mm_struct *mm);
73 #endif
74
75 #else /* !CONFIG_HUGETLB_PAGE */
76
77 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
78 {
79         return 0;
80 }
81 static inline unsigned long hugetlb_total_pages(void)
82 {
83         return 0;
84 }
85
86 #define follow_hugetlb_page(m,v,p,vs,a,b,i)     ({ BUG(); 0; })
87 #define follow_huge_addr(mm, addr, write)       ERR_PTR(-EINVAL)
88 #define copy_hugetlb_page_range(src, dst, vma)  ({ BUG(); 0; })
89 #define hugetlb_prefault(mapping, vma)          ({ BUG(); 0; })
90 #define zap_hugepage_range(vma, start, len)     BUG()
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()                       ({ NULL; })
103 #define free_huge_page(p)                       ({ (void)(p); BUG(); })
104 #define hugetlb_fault(mm, vma, addr, write)     ({ BUG(); 0; })
105
106 #ifndef HPAGE_MASK
107 #define HPAGE_MASK      0               /* Keep the compiler happy */
108 #define HPAGE_SIZE      0
109 #endif
110
111 #endif /* !CONFIG_HUGETLB_PAGE */
112
113 #ifdef CONFIG_HUGETLBFS
114 struct hugetlbfs_config {
115         uid_t   uid;
116         gid_t   gid;
117         umode_t mode;
118         long    nr_blocks;
119         long    nr_inodes;
120 };
121
122 struct hugetlbfs_sb_info {
123         long    max_blocks;   /* blocks allowed */
124         long    free_blocks;  /* blocks free */
125         long    max_inodes;   /* inodes allowed */
126         long    free_inodes;  /* inodes free */
127         spinlock_t      stat_lock;
128 };
129
130
131 struct hugetlbfs_inode_info {
132         struct shared_policy policy;
133         struct inode vfs_inode;
134 };
135
136 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
137 {
138         return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
139 }
140
141 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
142 {
143         return sb->s_fs_info;
144 }
145
146 extern struct file_operations hugetlbfs_file_operations;
147 extern struct vm_operations_struct hugetlb_vm_ops;
148 struct file *hugetlb_zero_setup(size_t);
149 int hugetlb_get_quota(struct address_space *mapping);
150 void hugetlb_put_quota(struct address_space *mapping);
151
152 static inline int is_file_hugepages(struct file *file)
153 {
154         return file->f_op == &hugetlbfs_file_operations;
155 }
156
157 static inline void set_file_hugepages(struct file *file)
158 {
159         file->f_op = &hugetlbfs_file_operations;
160 }
161 #else /* !CONFIG_HUGETLBFS */
162
163 #define is_file_hugepages(file)         0
164 #define set_file_hugepages(file)        BUG()
165 #define hugetlb_zero_setup(size)        ERR_PTR(-ENOSYS)
166
167 #endif /* !CONFIG_HUGETLBFS */
168
169 #endif /* _LINUX_HUGETLB_H */