[NET]: Inline net_device_stats
[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 <linux/shm.h>
8 #include <asm/tlbflush.h>
9
10 struct ctl_table;
11
12 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
13 {
14         return vma->vm_flags & VM_HUGETLB;
15 }
16
17 int hugetlb_sysctl_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
18 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
19 int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, struct page **, struct vm_area_struct **, unsigned long *, int *, int);
20 void unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
21 void __unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
22 int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
23 int hugetlb_report_meminfo(char *);
24 int hugetlb_report_node_meminfo(int, char *);
25 unsigned long hugetlb_total_pages(void);
26 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
27                         unsigned long address, int write_access);
28 int hugetlb_reserve_pages(struct inode *inode, long from, long to);
29 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
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 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
40 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
41                               int write);
42 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
43                                 pmd_t *pmd, int write);
44 int pmd_huge(pmd_t pmd);
45 void hugetlb_change_protection(struct vm_area_struct *vma,
46                 unsigned long address, unsigned long end, pgprot_t newprot);
47
48 #ifndef ARCH_HAS_HUGEPAGE_ONLY_RANGE
49 #define is_hugepage_only_range(mm, addr, len)   0
50 #endif
51
52 #ifndef ARCH_HAS_HUGETLB_FREE_PGD_RANGE
53 #define hugetlb_free_pgd_range  free_pgd_range
54 #else
55 void hugetlb_free_pgd_range(struct mmu_gather **tlb, unsigned long addr,
56                             unsigned long end, unsigned long floor,
57                             unsigned long ceiling);
58 #endif
59
60 #ifndef ARCH_HAS_PREPARE_HUGEPAGE_RANGE
61 /*
62  * If the arch doesn't supply something else, assume that hugepage
63  * size aligned regions are ok without further preparation.
64  */
65 static inline int prepare_hugepage_range(unsigned long addr, unsigned long len,
66                                                 pgoff_t pgoff)
67 {
68         if (pgoff & (~HPAGE_MASK >> PAGE_SHIFT))
69                 return -EINVAL;
70         if (len & ~HPAGE_MASK)
71                 return -EINVAL;
72         if (addr & ~HPAGE_MASK)
73                 return -EINVAL;
74         return 0;
75 }
76 #else
77 int prepare_hugepage_range(unsigned long addr, unsigned long len,
78                                                 pgoff_t pgoff);
79 #endif
80
81 #ifndef ARCH_HAS_SETCLEAR_HUGE_PTE
82 #define set_huge_pte_at(mm, addr, ptep, pte)    set_pte_at(mm, addr, ptep, pte)
83 #define huge_ptep_get_and_clear(mm, addr, ptep) ptep_get_and_clear(mm, addr, ptep)
84 #else
85 void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
86                      pte_t *ptep, pte_t pte);
87 pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
88                               pte_t *ptep);
89 #endif
90
91 #ifndef ARCH_HAS_HUGETLB_PREFAULT_HOOK
92 #define hugetlb_prefault_arch_hook(mm)          do { } while (0)
93 #else
94 void hugetlb_prefault_arch_hook(struct mm_struct *mm);
95 #endif
96
97 #else /* !CONFIG_HUGETLB_PAGE */
98
99 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
100 {
101         return 0;
102 }
103 static inline unsigned long hugetlb_total_pages(void)
104 {
105         return 0;
106 }
107
108 #define follow_hugetlb_page(m,v,p,vs,a,b,i)     ({ BUG(); 0; })
109 #define follow_huge_addr(mm, addr, write)       ERR_PTR(-EINVAL)
110 #define copy_hugetlb_page_range(src, dst, vma)  ({ BUG(); 0; })
111 #define hugetlb_prefault(mapping, vma)          ({ BUG(); 0; })
112 #define unmap_hugepage_range(vma, start, end)   BUG()
113 #define hugetlb_report_meminfo(buf)             0
114 #define hugetlb_report_node_meminfo(n, buf)     0
115 #define follow_huge_pmd(mm, addr, pmd, write)   NULL
116 #define prepare_hugepage_range(addr,len,pgoff)  (-EINVAL)
117 #define pmd_huge(x)     0
118 #define is_hugepage_only_range(mm, addr, len)   0
119 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
120 #define hugetlb_fault(mm, vma, addr, write)     ({ BUG(); 0; })
121
122 #define hugetlb_change_protection(vma, address, end, newprot)
123
124 #ifndef HPAGE_MASK
125 #define HPAGE_MASK      PAGE_MASK               /* Keep the compiler happy */
126 #define HPAGE_SIZE      PAGE_SIZE
127 #endif
128
129 #endif /* !CONFIG_HUGETLB_PAGE */
130
131 #ifdef CONFIG_HUGETLBFS
132 struct hugetlbfs_config {
133         uid_t   uid;
134         gid_t   gid;
135         umode_t mode;
136         long    nr_blocks;
137         long    nr_inodes;
138 };
139
140 struct hugetlbfs_sb_info {
141         long    max_blocks;   /* blocks allowed */
142         long    free_blocks;  /* blocks free */
143         long    max_inodes;   /* inodes allowed */
144         long    free_inodes;  /* inodes free */
145         spinlock_t      stat_lock;
146 };
147
148
149 struct hugetlbfs_inode_info {
150         struct shared_policy policy;
151         struct inode vfs_inode;
152 };
153
154 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
155 {
156         return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
157 }
158
159 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
160 {
161         return sb->s_fs_info;
162 }
163
164 extern const struct file_operations hugetlbfs_file_operations;
165 extern struct vm_operations_struct hugetlb_vm_ops;
166 struct file *hugetlb_zero_setup(size_t);
167 int hugetlb_get_quota(struct address_space *mapping);
168 void hugetlb_put_quota(struct address_space *mapping);
169
170 static inline int is_file_hugepages(struct file *file)
171 {
172         if (file->f_op == &hugetlbfs_file_operations)
173                 return 1;
174         if (is_file_shm_hugepages(file))
175                 return 1;
176
177         return 0;
178 }
179
180 static inline void set_file_hugepages(struct file *file)
181 {
182         file->f_op = &hugetlbfs_file_operations;
183 }
184 #else /* !CONFIG_HUGETLBFS */
185
186 #define is_file_hugepages(file)         0
187 #define set_file_hugepages(file)        BUG()
188 #define hugetlb_zero_setup(size)        ERR_PTR(-ENOSYS)
189
190 #endif /* !CONFIG_HUGETLBFS */
191
192 #endif /* _LINUX_HUGETLB_H */