Do not account for the address space used by hugetlbfs using VM_ACCOUNT
[linux-2.6.git] / include / linux / hugetlb.h
1 #ifndef _LINUX_HUGETLB_H
2 #define _LINUX_HUGETLB_H
3
4 #include <linux/fs.h>
5
6 #ifdef CONFIG_HUGETLB_PAGE
7
8 #include <linux/mempolicy.h>
9 #include <linux/shm.h>
10 #include <asm/tlbflush.h>
11
12 struct ctl_table;
13
14 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
15 {
16         return vma->vm_flags & VM_HUGETLB;
17 }
18
19 void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
20 int hugetlb_sysctl_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
21 int hugetlb_overcommit_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
22 int hugetlb_treat_movable_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
23 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
24 int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, struct page **, struct vm_area_struct **, unsigned long *, int *, int, int);
25 void unmap_hugepage_range(struct vm_area_struct *,
26                         unsigned long, unsigned long, struct page *);
27 void __unmap_hugepage_range(struct vm_area_struct *,
28                         unsigned long, unsigned long, struct page *);
29 int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
30 void hugetlb_report_meminfo(struct seq_file *);
31 int hugetlb_report_node_meminfo(int, char *);
32 unsigned long hugetlb_total_pages(void);
33 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
34                         unsigned long address, int write_access);
35 int hugetlb_reserve_pages(struct inode *inode, long from, long to,
36                                                 struct vm_area_struct *vma,
37                                                 int acctflags);
38 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
39
40 extern unsigned long hugepages_treat_as_movable;
41 extern const unsigned long hugetlb_zero, hugetlb_infinity;
42 extern int sysctl_hugetlb_shm_group;
43 extern struct list_head huge_boot_pages;
44
45 /* arch callbacks */
46
47 pte_t *huge_pte_alloc(struct mm_struct *mm,
48                         unsigned long addr, unsigned long sz);
49 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
50 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
51 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
52                               int write);
53 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
54                                 pmd_t *pmd, int write);
55 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
56                                 pud_t *pud, int write);
57 int pmd_huge(pmd_t pmd);
58 int pud_huge(pud_t pmd);
59 void hugetlb_change_protection(struct vm_area_struct *vma,
60                 unsigned long address, unsigned long end, pgprot_t newprot);
61
62 #else /* !CONFIG_HUGETLB_PAGE */
63
64 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
65 {
66         return 0;
67 }
68
69 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
70 {
71 }
72
73 static inline unsigned long hugetlb_total_pages(void)
74 {
75         return 0;
76 }
77
78 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w)   ({ BUG(); 0; })
79 #define follow_huge_addr(mm, addr, write)       ERR_PTR(-EINVAL)
80 #define copy_hugetlb_page_range(src, dst, vma)  ({ BUG(); 0; })
81 #define hugetlb_prefault(mapping, vma)          ({ BUG(); 0; })
82 #define unmap_hugepage_range(vma, start, end, page)     BUG()
83 static inline void hugetlb_report_meminfo(struct seq_file *m)
84 {
85 }
86 #define hugetlb_report_node_meminfo(n, buf)     0
87 #define follow_huge_pmd(mm, addr, pmd, write)   NULL
88 #define follow_huge_pud(mm, addr, pud, write)   NULL
89 #define prepare_hugepage_range(file, addr, len) (-EINVAL)
90 #define pmd_huge(x)     0
91 #define pud_huge(x)     0
92 #define is_hugepage_only_range(mm, addr, len)   0
93 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
94 #define hugetlb_fault(mm, vma, addr, write)     ({ BUG(); 0; })
95
96 #define hugetlb_change_protection(vma, address, end, newprot)
97
98 #ifndef HPAGE_MASK
99 #define HPAGE_MASK      PAGE_MASK               /* Keep the compiler happy */
100 #define HPAGE_SIZE      PAGE_SIZE
101 #endif
102
103 #endif /* !CONFIG_HUGETLB_PAGE */
104
105 #ifdef CONFIG_HUGETLBFS
106 struct hugetlbfs_config {
107         uid_t   uid;
108         gid_t   gid;
109         umode_t mode;
110         long    nr_blocks;
111         long    nr_inodes;
112         struct hstate *hstate;
113 };
114
115 struct hugetlbfs_sb_info {
116         long    max_blocks;   /* blocks allowed */
117         long    free_blocks;  /* blocks free */
118         long    max_inodes;   /* inodes allowed */
119         long    free_inodes;  /* inodes free */
120         spinlock_t      stat_lock;
121         struct hstate *hstate;
122 };
123
124
125 struct hugetlbfs_inode_info {
126         struct shared_policy policy;
127         struct inode vfs_inode;
128 };
129
130 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
131 {
132         return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
133 }
134
135 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
136 {
137         return sb->s_fs_info;
138 }
139
140 extern const struct file_operations hugetlbfs_file_operations;
141 extern struct vm_operations_struct hugetlb_vm_ops;
142 struct file *hugetlb_file_setup(const char *name, size_t, int);
143 int hugetlb_get_quota(struct address_space *mapping, long delta);
144 void hugetlb_put_quota(struct address_space *mapping, long delta);
145
146 static inline int is_file_hugepages(struct file *file)
147 {
148         if (file->f_op == &hugetlbfs_file_operations)
149                 return 1;
150         if (is_file_shm_hugepages(file))
151                 return 1;
152
153         return 0;
154 }
155
156 static inline void set_file_hugepages(struct file *file)
157 {
158         file->f_op = &hugetlbfs_file_operations;
159 }
160 #else /* !CONFIG_HUGETLBFS */
161
162 #define is_file_hugepages(file)         0
163 #define set_file_hugepages(file)        BUG()
164 #define hugetlb_file_setup(name,size)   ERR_PTR(-ENOSYS)
165
166 #endif /* !CONFIG_HUGETLBFS */
167
168 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
169 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
170                                         unsigned long len, unsigned long pgoff,
171                                         unsigned long flags);
172 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
173
174 #ifdef CONFIG_HUGETLB_PAGE
175
176 #define HSTATE_NAME_LEN 32
177 /* Defines one hugetlb page size */
178 struct hstate {
179         int hugetlb_next_nid;
180         unsigned int order;
181         unsigned long mask;
182         unsigned long max_huge_pages;
183         unsigned long nr_huge_pages;
184         unsigned long free_huge_pages;
185         unsigned long resv_huge_pages;
186         unsigned long surplus_huge_pages;
187         unsigned long nr_overcommit_huge_pages;
188         struct list_head hugepage_freelists[MAX_NUMNODES];
189         unsigned int nr_huge_pages_node[MAX_NUMNODES];
190         unsigned int free_huge_pages_node[MAX_NUMNODES];
191         unsigned int surplus_huge_pages_node[MAX_NUMNODES];
192         char name[HSTATE_NAME_LEN];
193 };
194
195 struct huge_bootmem_page {
196         struct list_head list;
197         struct hstate *hstate;
198 };
199
200 /* arch callback */
201 int __init alloc_bootmem_huge_page(struct hstate *h);
202
203 void __init hugetlb_add_hstate(unsigned order);
204 struct hstate *size_to_hstate(unsigned long size);
205
206 #ifndef HUGE_MAX_HSTATE
207 #define HUGE_MAX_HSTATE 1
208 #endif
209
210 extern struct hstate hstates[HUGE_MAX_HSTATE];
211 extern unsigned int default_hstate_idx;
212
213 #define default_hstate (hstates[default_hstate_idx])
214
215 static inline struct hstate *hstate_inode(struct inode *i)
216 {
217         struct hugetlbfs_sb_info *hsb;
218         hsb = HUGETLBFS_SB(i->i_sb);
219         return hsb->hstate;
220 }
221
222 static inline struct hstate *hstate_file(struct file *f)
223 {
224         return hstate_inode(f->f_dentry->d_inode);
225 }
226
227 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
228 {
229         return hstate_file(vma->vm_file);
230 }
231
232 static inline unsigned long huge_page_size(struct hstate *h)
233 {
234         return (unsigned long)PAGE_SIZE << h->order;
235 }
236
237 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
238
239 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
240
241 static inline unsigned long huge_page_mask(struct hstate *h)
242 {
243         return h->mask;
244 }
245
246 static inline unsigned int huge_page_order(struct hstate *h)
247 {
248         return h->order;
249 }
250
251 static inline unsigned huge_page_shift(struct hstate *h)
252 {
253         return h->order + PAGE_SHIFT;
254 }
255
256 static inline unsigned int pages_per_huge_page(struct hstate *h)
257 {
258         return 1 << h->order;
259 }
260
261 static inline unsigned int blocks_per_huge_page(struct hstate *h)
262 {
263         return huge_page_size(h) / 512;
264 }
265
266 #include <asm/hugetlb.h>
267
268 static inline struct hstate *page_hstate(struct page *page)
269 {
270         return size_to_hstate(PAGE_SIZE << compound_order(page));
271 }
272
273 #else
274 struct hstate {};
275 #define alloc_bootmem_huge_page(h) NULL
276 #define hstate_file(f) NULL
277 #define hstate_vma(v) NULL
278 #define hstate_inode(i) NULL
279 #define huge_page_size(h) PAGE_SIZE
280 #define huge_page_mask(h) PAGE_MASK
281 #define vma_kernel_pagesize(v) PAGE_SIZE
282 #define vma_mmu_pagesize(v) PAGE_SIZE
283 #define huge_page_order(h) 0
284 #define huge_page_shift(h) PAGE_SHIFT
285 static inline unsigned int pages_per_huge_page(struct hstate *h)
286 {
287         return 1;
288 }
289 #endif
290
291 #endif /* _LINUX_HUGETLB_H */