[PATCH] Hugepage consolidation
[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
29 extern unsigned long max_huge_pages;
30 extern const unsigned long hugetlb_zero, hugetlb_infinity;
31 extern int sysctl_hugetlb_shm_group;
32
33 /* arch callbacks */
34
35 pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr);
36 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
37 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
38                               int write);
39 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
40                                 pmd_t *pmd, int write);
41 int is_aligned_hugepage_range(unsigned long addr, unsigned long len);
42 int pmd_huge(pmd_t pmd);
43
44 #ifndef ARCH_HAS_HUGEPAGE_ONLY_RANGE
45 #define is_hugepage_only_range(mm, addr, len)   0
46 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) \
47                                                 do { } while (0)
48 #endif
49
50 #ifndef ARCH_HAS_PREPARE_HUGEPAGE_RANGE
51 #define prepare_hugepage_range(addr, len)       \
52         is_aligned_hugepage_range(addr, len)
53 #else
54 int prepare_hugepage_range(unsigned long addr, unsigned long len);
55 #endif
56
57 #ifndef ARCH_HAS_SETCLEAR_HUGE_PTE
58 #define set_huge_pte_at(mm, addr, ptep, pte)    set_pte_at(mm, addr, ptep, pte)
59 #define huge_ptep_get_and_clear(mm, addr, ptep) ptep_get_and_clear(mm, addr, ptep)
60 #else
61 void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
62                      pte_t *ptep, pte_t pte);
63 pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
64                               pte_t *ptep);
65 #endif
66
67 #ifndef ARCH_HAS_HUGETLB_PREFAULT_HOOK
68 #define hugetlb_prefault_arch_hook(mm)          do { } while (0)
69 #else
70 void hugetlb_prefault_arch_hook(struct mm_struct *mm);
71 #endif
72
73 #ifndef ARCH_HAS_HUGETLB_CLEAN_STALE_PGTABLE
74 #define hugetlb_clean_stale_pgtable(pte)        BUG()
75 #else
76 void hugetlb_clean_stale_pgtable(pte_t *pte);
77 #endif
78
79 #else /* !CONFIG_HUGETLB_PAGE */
80
81 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
82 {
83         return 0;
84 }
85 static inline unsigned long hugetlb_total_pages(void)
86 {
87         return 0;
88 }
89
90 #define follow_hugetlb_page(m,v,p,vs,a,b,i)     ({ BUG(); 0; })
91 #define follow_huge_addr(mm, addr, write)       ERR_PTR(-EINVAL)
92 #define copy_hugetlb_page_range(src, dst, vma)  ({ BUG(); 0; })
93 #define hugetlb_prefault(mapping, vma)          ({ BUG(); 0; })
94 #define zap_hugepage_range(vma, start, len)     BUG()
95 #define unmap_hugepage_range(vma, start, end)   BUG()
96 #define is_hugepage_mem_enough(size)            0
97 #define hugetlb_report_meminfo(buf)             0
98 #define hugetlb_report_node_meminfo(n, buf)     0
99 #define follow_huge_pmd(mm, addr, pmd, write)   NULL
100 #define is_aligned_hugepage_range(addr, len)    0
101 #define prepare_hugepage_range(addr, len)       (-EINVAL)
102 #define pmd_huge(x)     0
103 #define is_hugepage_only_range(mm, addr, len)   0
104 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) \
105                                                 do { } while (0)
106 #define alloc_huge_page()                       ({ NULL; })
107 #define free_huge_page(p)                       ({ (void)(p); BUG(); })
108
109 #ifndef HPAGE_MASK
110 #define HPAGE_MASK      0               /* Keep the compiler happy */
111 #define HPAGE_SIZE      0
112 #endif
113
114 #endif /* !CONFIG_HUGETLB_PAGE */
115
116 #ifdef CONFIG_HUGETLBFS
117 struct hugetlbfs_config {
118         uid_t   uid;
119         gid_t   gid;
120         umode_t mode;
121         long    nr_blocks;
122         long    nr_inodes;
123 };
124
125 struct hugetlbfs_sb_info {
126         long    max_blocks;   /* blocks allowed */
127         long    free_blocks;  /* blocks free */
128         long    max_inodes;   /* inodes allowed */
129         long    free_inodes;  /* inodes free */
130         spinlock_t      stat_lock;
131 };
132
133
134 struct hugetlbfs_inode_info {
135         struct shared_policy policy;
136         struct inode vfs_inode;
137 };
138
139 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
140 {
141         return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
142 }
143
144 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
145 {
146         return sb->s_fs_info;
147 }
148
149 extern struct file_operations hugetlbfs_file_operations;
150 extern struct vm_operations_struct hugetlb_vm_ops;
151 struct file *hugetlb_zero_setup(size_t);
152 int hugetlb_get_quota(struct address_space *mapping);
153 void hugetlb_put_quota(struct address_space *mapping);
154
155 static inline int is_file_hugepages(struct file *file)
156 {
157         return file->f_op == &hugetlbfs_file_operations;
158 }
159
160 static inline void set_file_hugepages(struct file *file)
161 {
162         file->f_op = &hugetlbfs_file_operations;
163 }
164 #else /* !CONFIG_HUGETLBFS */
165
166 #define is_file_hugepages(file)         0
167 #define set_file_hugepages(file)        BUG()
168 #define hugetlb_zero_setup(size)        ERR_PTR(-ENOSYS)
169
170 #endif /* !CONFIG_HUGETLBFS */
171
172 #endif /* _LINUX_HUGETLB_H */