[PATCH] hugetlb: prepare_hugepage_range check offset too
[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 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 unsigned long hugetlb_total_pages(void);
25 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
26                         unsigned long address, int write_access);
27 int hugetlb_reserve_pages(struct inode *inode, long from, long to);
28 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
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 pmd_huge(pmd_t pmd);
43 void hugetlb_change_protection(struct vm_area_struct *vma,
44                 unsigned long address, unsigned long end, pgprot_t newprot);
45
46 #ifndef ARCH_HAS_HUGEPAGE_ONLY_RANGE
47 #define is_hugepage_only_range(mm, addr, len)   0
48 #endif
49
50 #ifndef ARCH_HAS_HUGETLB_FREE_PGD_RANGE
51 #define hugetlb_free_pgd_range  free_pgd_range
52 #else
53 void hugetlb_free_pgd_range(struct mmu_gather **tlb, unsigned long addr,
54                             unsigned long end, unsigned long floor,
55                             unsigned long ceiling);
56 #endif
57
58 #ifndef ARCH_HAS_PREPARE_HUGEPAGE_RANGE
59 /*
60  * If the arch doesn't supply something else, assume that hugepage
61  * size aligned regions are ok without further preparation.
62  */
63 static inline int prepare_hugepage_range(unsigned long addr, unsigned long len,
64                                                 pgoff_t pgoff)
65 {
66         if (pgoff & (~HPAGE_MASK >> PAGE_SHIFT))
67                 return -EINVAL;
68         if (len & ~HPAGE_MASK)
69                 return -EINVAL;
70         if (addr & ~HPAGE_MASK)
71                 return -EINVAL;
72         return 0;
73 }
74 #else
75 int prepare_hugepage_range(unsigned long addr, unsigned long len,
76                                                 pgoff_t pgoff);
77 #endif
78
79 #ifndef ARCH_HAS_SETCLEAR_HUGE_PTE
80 #define set_huge_pte_at(mm, addr, ptep, pte)    set_pte_at(mm, addr, ptep, pte)
81 #define huge_ptep_get_and_clear(mm, addr, ptep) ptep_get_and_clear(mm, addr, ptep)
82 #else
83 void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
84                      pte_t *ptep, pte_t pte);
85 pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
86                               pte_t *ptep);
87 #endif
88
89 #ifndef ARCH_HAS_HUGETLB_PREFAULT_HOOK
90 #define hugetlb_prefault_arch_hook(mm)          do { } while (0)
91 #else
92 void hugetlb_prefault_arch_hook(struct mm_struct *mm);
93 #endif
94
95 #else /* !CONFIG_HUGETLB_PAGE */
96
97 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
98 {
99         return 0;
100 }
101 static inline unsigned long hugetlb_total_pages(void)
102 {
103         return 0;
104 }
105
106 #define follow_hugetlb_page(m,v,p,vs,a,b,i)     ({ BUG(); 0; })
107 #define follow_huge_addr(mm, addr, write)       ERR_PTR(-EINVAL)
108 #define copy_hugetlb_page_range(src, dst, vma)  ({ BUG(); 0; })
109 #define hugetlb_prefault(mapping, vma)          ({ BUG(); 0; })
110 #define unmap_hugepage_range(vma, start, end)   BUG()
111 #define hugetlb_report_meminfo(buf)             0
112 #define hugetlb_report_node_meminfo(n, buf)     0
113 #define follow_huge_pmd(mm, addr, pmd, write)   NULL
114 #define prepare_hugepage_range(addr,len,pgoff)  (-EINVAL)
115 #define pmd_huge(x)     0
116 #define is_hugepage_only_range(mm, addr, len)   0
117 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
118 #define hugetlb_fault(mm, vma, addr, write)     ({ BUG(); 0; })
119
120 #define hugetlb_change_protection(vma, address, end, newprot)
121
122 #ifndef HPAGE_MASK
123 #define HPAGE_MASK      PAGE_MASK               /* Keep the compiler happy */
124 #define HPAGE_SIZE      PAGE_SIZE
125 #endif
126
127 #endif /* !CONFIG_HUGETLB_PAGE */
128
129 #ifdef CONFIG_HUGETLBFS
130 struct hugetlbfs_config {
131         uid_t   uid;
132         gid_t   gid;
133         umode_t mode;
134         long    nr_blocks;
135         long    nr_inodes;
136 };
137
138 struct hugetlbfs_sb_info {
139         long    max_blocks;   /* blocks allowed */
140         long    free_blocks;  /* blocks free */
141         long    max_inodes;   /* inodes allowed */
142         long    free_inodes;  /* inodes free */
143         spinlock_t      stat_lock;
144 };
145
146
147 struct hugetlbfs_inode_info {
148         struct shared_policy policy;
149         struct inode vfs_inode;
150 };
151
152 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
153 {
154         return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
155 }
156
157 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
158 {
159         return sb->s_fs_info;
160 }
161
162 extern const struct file_operations hugetlbfs_file_operations;
163 extern struct vm_operations_struct hugetlb_vm_ops;
164 struct file *hugetlb_zero_setup(size_t);
165 int hugetlb_get_quota(struct address_space *mapping);
166 void hugetlb_put_quota(struct address_space *mapping);
167
168 static inline int is_file_hugepages(struct file *file)
169 {
170         return file->f_op == &hugetlbfs_file_operations;
171 }
172
173 static inline void set_file_hugepages(struct file *file)
174 {
175         file->f_op = &hugetlbfs_file_operations;
176 }
177 #else /* !CONFIG_HUGETLBFS */
178
179 #define is_file_hugepages(file)         0
180 #define set_file_hugepages(file)        BUG()
181 #define hugetlb_zero_setup(size)        ERR_PTR(-ENOSYS)
182
183 #endif /* !CONFIG_HUGETLBFS */
184
185 #endif /* _LINUX_HUGETLB_H */