1 #ifndef _LINUX_HUGETLB_H
2 #define _LINUX_HUGETLB_H
6 #ifdef CONFIG_HUGETLB_PAGE
8 #include <linux/mempolicy.h>
10 #include <asm/tlbflush.h>
11 #include <asm/hugetlb.h>
15 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
17 return vma->vm_flags & VM_HUGETLB;
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 *, unsigned long, unsigned long);
26 void __unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
27 int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
28 int hugetlb_report_meminfo(char *);
29 int hugetlb_report_node_meminfo(int, char *);
30 unsigned long hugetlb_total_pages(void);
31 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
32 unsigned long address, int write_access);
33 int hugetlb_reserve_pages(struct inode *inode, long from, long to);
34 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
36 extern unsigned long max_huge_pages;
37 extern unsigned long sysctl_overcommit_huge_pages;
38 extern unsigned long hugepages_treat_as_movable;
39 extern const unsigned long hugetlb_zero, hugetlb_infinity;
40 extern int sysctl_hugetlb_shm_group;
44 pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr);
45 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
46 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
47 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
49 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
50 pmd_t *pmd, int write);
51 int pmd_huge(pmd_t pmd);
52 void hugetlb_change_protection(struct vm_area_struct *vma,
53 unsigned long address, unsigned long end, pgprot_t newprot);
55 #else /* !CONFIG_HUGETLB_PAGE */
57 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
61 static inline unsigned long hugetlb_total_pages(void)
66 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ 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 unmap_hugepage_range(vma, start, end) BUG()
71 #define hugetlb_report_meminfo(buf) 0
72 #define hugetlb_report_node_meminfo(n, buf) 0
73 #define follow_huge_pmd(mm, addr, pmd, write) NULL
74 #define prepare_hugepage_range(addr,len) (-EINVAL)
76 #define is_hugepage_only_range(mm, addr, len) 0
77 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
78 #define hugetlb_fault(mm, vma, addr, write) ({ BUG(); 0; })
80 #define hugetlb_change_protection(vma, address, end, newprot)
83 #define HPAGE_MASK PAGE_MASK /* Keep the compiler happy */
84 #define HPAGE_SIZE PAGE_SIZE
87 #endif /* !CONFIG_HUGETLB_PAGE */
89 #ifdef CONFIG_HUGETLBFS
90 struct hugetlbfs_config {
98 struct hugetlbfs_sb_info {
99 long max_blocks; /* blocks allowed */
100 long free_blocks; /* blocks free */
101 long max_inodes; /* inodes allowed */
102 long free_inodes; /* inodes free */
103 spinlock_t stat_lock;
107 struct hugetlbfs_inode_info {
108 struct shared_policy policy;
109 struct inode vfs_inode;
112 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
114 return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
117 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
119 return sb->s_fs_info;
122 extern const struct file_operations hugetlbfs_file_operations;
123 extern struct vm_operations_struct hugetlb_vm_ops;
124 struct file *hugetlb_file_setup(const char *name, size_t);
125 int hugetlb_get_quota(struct address_space *mapping, long delta);
126 void hugetlb_put_quota(struct address_space *mapping, long delta);
128 #define BLOCKS_PER_HUGEPAGE (HPAGE_SIZE / 512)
130 static inline int is_file_hugepages(struct file *file)
132 if (file->f_op == &hugetlbfs_file_operations)
134 if (is_file_shm_hugepages(file))
140 static inline void set_file_hugepages(struct file *file)
142 file->f_op = &hugetlbfs_file_operations;
144 #else /* !CONFIG_HUGETLBFS */
146 #define is_file_hugepages(file) 0
147 #define set_file_hugepages(file) BUG()
148 #define hugetlb_file_setup(name,size) ERR_PTR(-ENOSYS)
150 #endif /* !CONFIG_HUGETLBFS */
152 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
153 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
154 unsigned long len, unsigned long pgoff,
155 unsigned long flags);
156 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
158 #endif /* _LINUX_HUGETLB_H */