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