[mirror_ubuntu-artful-kernel.git] / include / linux / hugetlb.h

#ifndef _LINUX_HUGETLB_H
#define _LINUX_HUGETLB_H

#include <linux/fs.h>

#ifdef CONFIG_HUGETLB_PAGE

#include <linux/mempolicy.h>
#include <linux/shm.h>
#include <asm/tlbflush.h>
#include <asm/hugetlb.h>

struct ctl_table;

static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
{
	return vma->vm_flags & VM_HUGETLB;
}

int hugetlb_sysctl_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
int hugetlb_overcommit_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
int hugetlb_treat_movable_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, struct page **, struct vm_area_struct **, unsigned long *, int *, int, int);
void unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
void __unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
int hugetlb_report_meminfo(char *);
int hugetlb_report_node_meminfo(int, char *);
unsigned long hugetlb_total_pages(void);
int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
			unsigned long address, int write_access);
int hugetlb_reserve_pages(struct inode *inode, long from, long to);
void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);

extern unsigned long max_huge_pages;
extern unsigned long sysctl_overcommit_huge_pages;
extern unsigned long hugepages_treat_as_movable;
extern const unsigned long hugetlb_zero, hugetlb_infinity;
extern int sysctl_hugetlb_shm_group;

/* arch callbacks */

pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr);
pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
			      int write);
struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
				pmd_t *pmd, int write);
int pmd_huge(pmd_t pmd);
void hugetlb_change_protection(struct vm_area_struct *vma,
		unsigned long address, unsigned long end, pgprot_t newprot);

#else /* !CONFIG_HUGETLB_PAGE */

static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
{
	return 0;
}
static inline unsigned long hugetlb_total_pages(void)
{
	return 0;
}

#define follow_hugetlb_page(m,v,p,vs,a,b,i,w)	({ BUG(); 0; })
#define follow_huge_addr(mm, addr, write)	ERR_PTR(-EINVAL)
#define copy_hugetlb_page_range(src, dst, vma)	({ BUG(); 0; })
#define hugetlb_prefault(mapping, vma)		({ BUG(); 0; })
#define unmap_hugepage_range(vma, start, end)	BUG()
#define hugetlb_report_meminfo(buf)		0
#define hugetlb_report_node_meminfo(n, buf)	0
#define follow_huge_pmd(mm, addr, pmd, write)	NULL
#define prepare_hugepage_range(addr,len)	(-EINVAL)
#define pmd_huge(x)	0
#define is_hugepage_only_range(mm, addr, len)	0
#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
#define hugetlb_fault(mm, vma, addr, write)	({ BUG(); 0; })

#define hugetlb_change_protection(vma, address, end, newprot)

#ifndef HPAGE_MASK
#define HPAGE_MASK	PAGE_MASK		/* Keep the compiler happy */
#define HPAGE_SIZE	PAGE_SIZE
#endif

#endif /* !CONFIG_HUGETLB_PAGE */

#ifdef CONFIG_HUGETLBFS
struct hugetlbfs_config {
	uid_t   uid;
	gid_t   gid;
	umode_t mode;
	long	nr_blocks;
	long	nr_inodes;
};

struct hugetlbfs_sb_info {
	long	max_blocks;   /* blocks allowed */
	long	free_blocks;  /* blocks free */
	long	max_inodes;   /* inodes allowed */
	long	free_inodes;  /* inodes free */
	spinlock_t	stat_lock;
};


struct hugetlbfs_inode_info {
	struct shared_policy policy;
	struct inode vfs_inode;
};

static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
{
	return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
}

static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
{
	return sb->s_fs_info;
}

extern const struct file_operations hugetlbfs_file_operations;
extern struct vm_operations_struct hugetlb_vm_ops;
struct file *hugetlb_file_setup(const char *name, size_t);
int hugetlb_get_quota(struct address_space *mapping, long delta);
void hugetlb_put_quota(struct address_space *mapping, long delta);

#define BLOCKS_PER_HUGEPAGE	(HPAGE_SIZE / 512)

static inline int is_file_hugepages(struct file *file)
{
	if (file->f_op == &hugetlbfs_file_operations)
		return 1;
	if (is_file_shm_hugepages(file))
		return 1;

	return 0;
}

static inline void set_file_hugepages(struct file *file)
{
	file->f_op = &hugetlbfs_file_operations;
}
#else /* !CONFIG_HUGETLBFS */

#define is_file_hugepages(file)		0
#define set_file_hugepages(file)	BUG()
#define hugetlb_file_setup(name,size)	ERR_PTR(-ENOSYS)

#endif /* !CONFIG_HUGETLBFS */

#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
					unsigned long len, unsigned long pgoff,
					unsigned long flags);
#endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */

#endif /* _LINUX_HUGETLB_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef _LINUX_HUGETLB_H
	2	#define _LINUX_HUGETLB_H
	3
4e950f6f AD	4	#include <linux/fs.h>
4e950f6f AD	5
1da177e4 LT	6	#ifdef CONFIG_HUGETLB_PAGE
	7
	8	#include <linux/mempolicy.h>
516dffdc	9	#include <linux/shm.h>
63551ae0	10	#include <asm/tlbflush.h>
6d779079	11	#include <asm/hugetlb.h>
1da177e4 LT	12
	13	struct ctl_table;
	14
	15	static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
	16	{
	17	return vma->vm_flags & VM_HUGETLB;
	18	}
	19
	20	int hugetlb_sysctl_handler(struct ctl_table , int, struct file , void __user , size_t , loff_t *);
a3d0c6aa	21	int hugetlb_overcommit_handler(struct ctl_table , int, struct file , void __user , size_t , loff_t *);
396faf03	22	int hugetlb_treat_movable_handler(struct ctl_table , int, struct file , void __user , size_t , loff_t *);
1da177e4	23	int copy_hugetlb_page_range(struct mm_struct , struct mm_struct , struct vm_area_struct *);
5b23dbe8	24	int follow_hugetlb_page(struct mm_struct , struct vm_area_struct , struct page , struct vm_area_struct , unsigned long , int , int, int);
1da177e4	25	void unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
502717f4	26	void __unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
1da177e4 LT	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 *);
1da177e4	30	unsigned long hugetlb_total_pages(void);
ac9b9c66 HD	31	int hugetlb_fault(struct mm_struct mm, struct vm_area_struct vma,
ac9b9c66 HD	32	unsigned long address, int write_access);
a43a8c39 KC	33	int hugetlb_reserve_pages(struct inode *inode, long from, long to);
a43a8c39 KC	34	void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
1da177e4 LT	35
1da177e4 LT	36	extern unsigned long max_huge_pages;
064d9efe	37	extern unsigned long sysctl_overcommit_huge_pages;
396faf03	38	extern unsigned long hugepages_treat_as_movable;
1da177e4 LT	39	extern const unsigned long hugetlb_zero, hugetlb_infinity;
	40	extern int sysctl_hugetlb_shm_group;
	41
63551ae0 DG	42	/* arch callbacks */
	43
	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);
39dde65c	46	int huge_pmd_unshare(struct mm_struct mm, unsigned long addr, pte_t *ptep);
63551ae0 DG	47	struct page follow_huge_addr(struct mm_struct mm, unsigned long address,
	48	int write);
	49	struct page follow_huge_pmd(struct mm_struct mm, unsigned long address,
	50	pmd_t *pmd, int write);
63551ae0	51	int pmd_huge(pmd_t pmd);
8f860591 ZY	52	void hugetlb_change_protection(struct vm_area_struct *vma,
8f860591 ZY	53	unsigned long address, unsigned long end, pgprot_t newprot);
63551ae0	54
1da177e4 LT	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
5b23dbe8	66	#define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; })
1da177e4 LT	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; })
1da177e4	70	#define unmap_hugepage_range(vma, start, end) BUG()
1da177e4 LT	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
dec4ad86	74	#define prepare_hugepage_range(addr,len) (-EINVAL)
1da177e4 LT	75	#define pmd_huge(x) 0
1da177e4 LT	76	#define is_hugepage_only_range(mm, addr, len) 0
9da61aef	77	#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
ac9b9c66	78	#define hugetlb_fault(mm, vma, addr, write) ({ BUG(); 0; })
1da177e4	79
8f860591 ZY	80	#define hugetlb_change_protection(vma, address, end, newprot)
8f860591 ZY	81
1da177e4	82	#ifndef HPAGE_MASK
51c6f666 RH	83	#define HPAGE_MASK PAGE_MASK /* Keep the compiler happy */
51c6f666 RH	84	#define HPAGE_SIZE PAGE_SIZE
1da177e4 LT	85	#endif
	86
	87	#endif /* !CONFIG_HUGETLB_PAGE */
	88
	89	#ifdef CONFIG_HUGETLBFS
	90	struct hugetlbfs_config {
	91	uid_t uid;
	92	gid_t gid;
	93	umode_t mode;
	94	long nr_blocks;
	95	long nr_inodes;
	96	};
	97
	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;
	104	};
	105
	106
	107	struct hugetlbfs_inode_info {
	108	struct shared_policy policy;
	109	struct inode vfs_inode;
	110	};
	111
	112	static inline struct hugetlbfs_inode_info HUGETLBFS_I(struct inode inode)
	113	{
	114	return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
	115	}
	116
	117	static inline struct hugetlbfs_sb_info HUGETLBFS_SB(struct super_block sb)
	118	{
	119	return sb->s_fs_info;
	120	}
	121
4b6f5d20	122	extern const struct file_operations hugetlbfs_file_operations;
1da177e4	123	extern struct vm_operations_struct hugetlb_vm_ops;
9d66586f	124	struct file hugetlb_file_setup(const char name, size_t);
9a119c05 AL	125	int hugetlb_get_quota(struct address_space *mapping, long delta);
9a119c05 AL	126	void hugetlb_put_quota(struct address_space *mapping, long delta);
1da177e4	127
45c682a6 KC	128	#define BLOCKS_PER_HUGEPAGE (HPAGE_SIZE / 512)
45c682a6 KC	129
1da177e4 LT	130	static inline int is_file_hugepages(struct file *file)
1da177e4 LT	131	{
516dffdc AL	132	if (file->f_op == &hugetlbfs_file_operations)
	133	return 1;
	134	if (is_file_shm_hugepages(file))
	135	return 1;
	136
	137	return 0;
1da177e4 LT	138	}
	139
	140	static inline void set_file_hugepages(struct file *file)
	141	{
	142	file->f_op = &hugetlbfs_file_operations;
	143	}
	144	#else /* !CONFIG_HUGETLBFS */
	145
	146	#define is_file_hugepages(file) 0
	147	#define set_file_hugepages(file) BUG()
9d66586f	148	#define hugetlb_file_setup(name,size) ERR_PTR(-ENOSYS)
1da177e4 LT	149
	150	#endif /* !CONFIG_HUGETLBFS */
	151
d2ba27e8 AB	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 */
	157
1da177e4	158	#endif /* _LINUX_HUGETLB_H */