Merge to Fedora kernel-2.6.6-1.406
[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
8 struct ctl_table;
9
10 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
11 {
12         return vma->vm_flags & VM_HUGETLB;
13 }
14
15 int hugetlb_sysctl_handler(struct ctl_table *, int, struct file *, void *, size_t *);
16 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
17 int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, struct page **, struct vm_area_struct **, unsigned long *, int *, int);
18 void zap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
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 is_hugepage_mem_enough(size_t);
23 unsigned long hugetlb_total_pages(void);
24 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
25                               int write);
26 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
27                                 pmd_t *pmd, int write);
28 int is_aligned_hugepage_range(unsigned long addr, unsigned long len);
29 int pmd_huge(pmd_t pmd);
30 struct page *alloc_huge_page(void);
31 void free_huge_page(struct page *);
32
33 extern unsigned long max_huge_pages;
34 extern const unsigned long hugetlb_zero, hugetlb_infinity;
35
36 static inline void
37 mark_mm_hugetlb(struct mm_struct *mm, struct vm_area_struct *vma)
38 {
39         if (is_vm_hugetlb_page(vma))
40                 mm->used_hugetlb = 1;
41 }
42
43 #ifndef ARCH_HAS_HUGEPAGE_ONLY_RANGE
44 #define is_hugepage_only_range(addr, len)       0
45 #define hugetlb_free_pgtables(tlb, prev, start, end) do { } while (0)
46 #endif
47
48 #ifndef ARCH_HAS_PREPARE_HUGEPAGE_RANGE
49 #define prepare_hugepage_range(addr, len)       \
50         is_aligned_hugepage_range(addr, len)
51 #else
52 int prepare_hugepage_range(unsigned long addr, unsigned long len);
53 #endif
54
55 #else /* !CONFIG_HUGETLB_PAGE */
56
57 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
58 {
59         return 0;
60 }
61 static inline unsigned long hugetlb_total_pages(void)
62 {
63         return 0;
64 }
65
66 #define follow_hugetlb_page(m,v,p,vs,a,b,i)     ({ BUG(); 0; })
67 #define follow_huge_addr(mm, addr, write)       ERR_PTR(-EINVAL)
68 #define copy_hugetlb_page_range(src, dst, vma)  ({ BUG(); 0; })
69 #define hugetlb_prefault(mapping, vma)          ({ BUG(); 0; })
70 #define zap_hugepage_range(vma, start, len)     BUG()
71 #define unmap_hugepage_range(vma, start, end)   BUG()
72 #define is_hugepage_mem_enough(size)            0
73 #define hugetlb_report_meminfo(buf)             0
74 #define mark_mm_hugetlb(mm, vma)                do { } while (0)
75 #define follow_huge_pmd(mm, addr, pmd, write)   0
76 #define is_aligned_hugepage_range(addr, len)    0
77 #define prepare_hugepage_range(addr, len)       (-EINVAL)
78 #define pmd_huge(x)     0
79 #define is_hugepage_only_range(addr, len)       0
80 #define hugetlb_free_pgtables(tlb, prev, start, end) do { } while (0)
81 #define alloc_huge_page()                       ({ NULL; })
82 #define free_huge_page(p)                       ({ (void)(p); BUG(); })
83
84 #ifndef HPAGE_MASK
85 #define HPAGE_MASK      0               /* Keep the compiler happy */
86 #define HPAGE_SIZE      0
87 #endif
88
89 #endif /* !CONFIG_HUGETLB_PAGE */
90
91 #ifdef CONFIG_HUGETLBFS
92 struct hugetlbfs_config {
93         uid_t   uid;
94         gid_t   gid;
95         umode_t mode;
96         long    nr_blocks;
97         long    nr_inodes;
98 };
99
100 struct hugetlbfs_sb_info {
101         long    max_blocks;   /* blocks allowed */
102         long    free_blocks;  /* blocks free */
103         long    max_inodes;   /* inodes allowed */
104         long    free_inodes;  /* inodes free */
105         spinlock_t      stat_lock;
106 };
107
108
109 struct hugetlbfs_inode_info {
110         struct shared_policy policy;
111         struct inode vfs_inode;
112 };
113
114 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
115 {
116         return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
117 }
118
119 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
120 {
121         return sb->s_fs_info;
122 }
123
124 extern struct file_operations hugetlbfs_file_operations;
125 extern struct vm_operations_struct hugetlb_vm_ops;
126 struct file *hugetlb_zero_setup(size_t);
127 int hugetlb_get_quota(struct address_space *mapping);
128 void hugetlb_put_quota(struct address_space *mapping);
129
130 static inline int is_file_hugepages(struct file *file)
131 {
132         return file->f_op == &hugetlbfs_file_operations;
133 }
134
135 static inline void set_file_hugepages(struct file *file)
136 {
137         file->f_op = &hugetlbfs_file_operations;
138 }
139 #else /* !CONFIG_HUGETLBFS */
140
141 #define is_file_hugepages(file)         0
142 #define set_file_hugepages(file)        BUG()
143 #define hugetlb_zero_setup(size)        ERR_PTR(-ENOSYS)
144
145 #endif /* !CONFIG_HUGETLBFS */
146
147 #endif /* _LINUX_HUGETLB_H */