[linux-2.6-block.git] / include / linux / hugetlb.h

#ifndef _LINUX_HUGETLB_H
#define _LINUX_HUGETLB_H

#include <linux/mm_types.h>
#include <linux/fs.h>
#include <linux/hugetlb_inline.h>

struct ctl_table;
struct user_struct;

#ifdef CONFIG_HUGETLB_PAGE

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

int PageHuge(struct page *page);

void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);

#ifdef CONFIG_NUMA
int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
					void __user *, size_t *, loff_t *);
#endif

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, unsigned int flags);
void unmap_hugepage_range(struct vm_area_struct *,
			unsigned long, unsigned long, struct page *);
void __unmap_hugepage_range(struct vm_area_struct *,
			unsigned long, unsigned long, struct page *);
int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
void hugetlb_report_meminfo(struct seq_file *);
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, unsigned int flags);
int hugetlb_reserve_pages(struct inode *inode, long from, long to,
						struct vm_area_struct *vma,
						vm_flags_t vm_flags);
void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
int dequeue_hwpoisoned_huge_page(struct page *page);
void copy_huge_page(struct page *dst, struct page *src);

extern unsigned long hugepages_treat_as_movable;
extern const unsigned long hugetlb_zero, hugetlb_infinity;
extern int sysctl_hugetlb_shm_group;
extern struct list_head huge_boot_pages;

/* arch callbacks */

pte_t *huge_pte_alloc(struct mm_struct *mm,
			unsigned long addr, unsigned long sz);
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);
struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
				pud_t *pud, int write);
int pmd_huge(pmd_t pmd);
int pud_huge(pud_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 PageHuge(struct page *page)
{
	return 0;
}

static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
{
}

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, page)	BUG()
static inline void hugetlb_report_meminfo(struct seq_file *m)
{
}
#define hugetlb_report_node_meminfo(n, buf)	0
#define follow_huge_pmd(mm, addr, pmd, write)	NULL
#define follow_huge_pud(mm, addr, pud, write)	NULL
#define prepare_hugepage_range(file, addr, len)	(-EINVAL)
#define pmd_huge(x)	0
#define pud_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, flags)	({ BUG(); 0; })
#define huge_pte_offset(mm, address)	0
#define dequeue_hwpoisoned_huge_page(page)	0
static inline void copy_huge_page(struct page *dst, struct page *src)
{
}

#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 */

#define HUGETLB_ANON_FILE "anon_hugepage"

enum {
	/*
	 * The file will be used as an shm file so shmfs accounting rules
	 * apply
	 */
	HUGETLB_SHMFS_INODE     = 1,
	/*
	 * The file is being created on the internal vfs mount and shmfs
	 * accounting rules do not apply
	 */
	HUGETLB_ANONHUGE_INODE  = 2,
};

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

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 hstate *hstate;
};


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 const struct vm_operations_struct hugetlb_vm_ops;
struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,
				struct user_struct **user, int creat_flags);
int hugetlb_get_quota(struct address_space *mapping, long delta);
void hugetlb_put_quota(struct address_space *mapping, long delta);

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()
static inline struct file *hugetlb_file_setup(const char *name, size_t size,
		vm_flags_t acctflag, struct user_struct **user, int creat_flags)
{
	return 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 */

#ifdef CONFIG_HUGETLB_PAGE

#define HSTATE_NAME_LEN 32
/* Defines one hugetlb page size */
struct hstate {
	int next_nid_to_alloc;
	int next_nid_to_free;
	unsigned int order;
	unsigned long mask;
	unsigned long max_huge_pages;
	unsigned long nr_huge_pages;
	unsigned long free_huge_pages;
	unsigned long resv_huge_pages;
	unsigned long surplus_huge_pages;
	unsigned long nr_overcommit_huge_pages;
	struct list_head hugepage_freelists[MAX_NUMNODES];
	unsigned int nr_huge_pages_node[MAX_NUMNODES];
	unsigned int free_huge_pages_node[MAX_NUMNODES];
	unsigned int surplus_huge_pages_node[MAX_NUMNODES];
	char name[HSTATE_NAME_LEN];
};

struct huge_bootmem_page {
	struct list_head list;
	struct hstate *hstate;
#ifdef CONFIG_HIGHMEM
	phys_addr_t phys;
#endif
};

struct page *alloc_huge_page_node(struct hstate *h, int nid);

/* arch callback */
int __init alloc_bootmem_huge_page(struct hstate *h);

void __init hugetlb_add_hstate(unsigned order);
struct hstate *size_to_hstate(unsigned long size);

#ifndef HUGE_MAX_HSTATE
#define HUGE_MAX_HSTATE 1
#endif

extern struct hstate hstates[HUGE_MAX_HSTATE];
extern unsigned int default_hstate_idx;

#define default_hstate (hstates[default_hstate_idx])

static inline struct hstate *hstate_inode(struct inode *i)
{
	struct hugetlbfs_sb_info *hsb;
	hsb = HUGETLBFS_SB(i->i_sb);
	return hsb->hstate;
}

static inline struct hstate *hstate_file(struct file *f)
{
	return hstate_inode(f->f_dentry->d_inode);
}

static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
{
	return hstate_file(vma->vm_file);
}

static inline unsigned long huge_page_size(struct hstate *h)
{
	return (unsigned long)PAGE_SIZE << h->order;
}

extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);

extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);

static inline unsigned long huge_page_mask(struct hstate *h)
{
	return h->mask;
}

static inline unsigned int huge_page_order(struct hstate *h)
{
	return h->order;
}

static inline unsigned huge_page_shift(struct hstate *h)
{
	return h->order + PAGE_SHIFT;
}

static inline unsigned int pages_per_huge_page(struct hstate *h)
{
	return 1 << h->order;
}

static inline unsigned int blocks_per_huge_page(struct hstate *h)
{
	return huge_page_size(h) / 512;
}

#include <asm/hugetlb.h>

static inline struct hstate *page_hstate(struct page *page)
{
	return size_to_hstate(PAGE_SIZE << compound_order(page));
}

static inline unsigned hstate_index_to_shift(unsigned index)
{
	return hstates[index].order + PAGE_SHIFT;
}

#else
struct hstate {};
#define alloc_huge_page_node(h, nid) NULL
#define alloc_bootmem_huge_page(h) NULL
#define hstate_file(f) NULL
#define hstate_vma(v) NULL
#define hstate_inode(i) NULL
#define huge_page_size(h) PAGE_SIZE
#define huge_page_mask(h) PAGE_MASK
#define vma_kernel_pagesize(v) PAGE_SIZE
#define vma_mmu_pagesize(v) PAGE_SIZE
#define huge_page_order(h) 0
#define huge_page_shift(h) PAGE_SHIFT
static inline unsigned int pages_per_huge_page(struct hstate *h)
{
	return 1;
}
#define hstate_index_to_shift(index) 0
#endif

#endif /* _LINUX_HUGETLB_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef _LINUX_HUGETLB_H
	2	#define _LINUX_HUGETLB_H
	3
be93d8cf	4	#include <linux/mm_types.h>
4e950f6f	5	#include <linux/fs.h>
8edf344c	6	#include <linux/hugetlb_inline.h>
4e950f6f	7
e9ea0e2d AM	8	struct ctl_table;
	9	struct user_struct;
	10
1da177e4 LT	11	#ifdef CONFIG_HUGETLB_PAGE
	12
	13	#include <linux/mempolicy.h>
516dffdc	14	#include <linux/shm.h>
63551ae0	15	#include <asm/tlbflush.h>
1da177e4	16
20a0307c WF	17	int PageHuge(struct page *page);
20a0307c WF	18
a1e78772	19	void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
8d65af78 AD	20	int hugetlb_sysctl_handler(struct ctl_table , int, void __user , size_t , loff_t );
	21	int hugetlb_overcommit_handler(struct ctl_table , int, void __user , size_t , loff_t );
	22	int hugetlb_treat_movable_handler(struct ctl_table , int, void __user , size_t , loff_t );
06808b08 LS	23
	24	#ifdef CONFIG_NUMA
	25	int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
	26	void __user , size_t , loff_t *);
	27	#endif
	28
1da177e4	29	int copy_hugetlb_page_range(struct mm_struct , struct mm_struct , struct vm_area_struct *);
2a15efc9 HD	30	int follow_hugetlb_page(struct mm_struct , struct vm_area_struct ,
	31	struct page , struct vm_area_struct ,
	32	unsigned long , int , int, unsigned int flags);
04f2cbe3 MG	33	void unmap_hugepage_range(struct vm_area_struct *,
	34	unsigned long, unsigned long, struct page *);
	35	void __unmap_hugepage_range(struct vm_area_struct *,
	36	unsigned long, unsigned long, struct page *);
1da177e4	37	int hugetlb_prefault(struct address_space , struct vm_area_struct );
e1759c21	38	void hugetlb_report_meminfo(struct seq_file *);
1da177e4	39	int hugetlb_report_node_meminfo(int, char *);
1da177e4	40	unsigned long hugetlb_total_pages(void);
ac9b9c66	41	int hugetlb_fault(struct mm_struct mm, struct vm_area_struct vma,
788c7df4	42	unsigned long address, unsigned int flags);
a1e78772	43	int hugetlb_reserve_pages(struct inode *inode, long from, long to,
5a6fe125	44	struct vm_area_struct *vma,
ca16d140	45	vm_flags_t vm_flags);
a43a8c39	46	void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
6de2b1aa	47	int dequeue_hwpoisoned_huge_page(struct page *page);
0ebabb41	48	void copy_huge_page(struct page dst, struct page src);
1da177e4	49
396faf03	50	extern unsigned long hugepages_treat_as_movable;
1da177e4 LT	51	extern const unsigned long hugetlb_zero, hugetlb_infinity;
1da177e4 LT	52	extern int sysctl_hugetlb_shm_group;
53ba51d2	53	extern struct list_head huge_boot_pages;
1da177e4	54
63551ae0 DG	55	/* arch callbacks */
63551ae0 DG	56
a5516438 AK	57	pte_t huge_pte_alloc(struct mm_struct mm,
a5516438 AK	58	unsigned long addr, unsigned long sz);
63551ae0	59	pte_t huge_pte_offset(struct mm_struct mm, unsigned long addr);
39dde65c	60	int huge_pmd_unshare(struct mm_struct mm, unsigned long addr, pte_t *ptep);
63551ae0 DG	61	struct page follow_huge_addr(struct mm_struct mm, unsigned long address,
	62	int write);
	63	struct page follow_huge_pmd(struct mm_struct mm, unsigned long address,
	64	pmd_t *pmd, int write);
ceb86879 AK	65	struct page follow_huge_pud(struct mm_struct mm, unsigned long address,
ceb86879 AK	66	pud_t *pud, int write);
63551ae0	67	int pmd_huge(pmd_t pmd);
ceb86879	68	int pud_huge(pud_t pmd);
8f860591 ZY	69	void hugetlb_change_protection(struct vm_area_struct *vma,
8f860591 ZY	70	unsigned long address, unsigned long end, pgprot_t newprot);
63551ae0	71
1da177e4 LT	72	#else /* !CONFIG_HUGETLB_PAGE */
1da177e4 LT	73
20a0307c WF	74	static inline int PageHuge(struct page *page)
	75	{
	76	return 0;
	77	}
	78
a1e78772 MG	79	static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
	80	{
	81	}
	82
1da177e4 LT	83	static inline unsigned long hugetlb_total_pages(void)
	84	{
	85	return 0;
	86	}
	87
5b23dbe8	88	#define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; })
1da177e4 LT	89	#define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
	90	#define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
	91	#define hugetlb_prefault(mapping, vma) ({ BUG(); 0; })
04f2cbe3	92	#define unmap_hugepage_range(vma, start, end, page) BUG()
e1759c21 AD	93	static inline void hugetlb_report_meminfo(struct seq_file *m)
	94	{
	95	}
1da177e4 LT	96	#define hugetlb_report_node_meminfo(n, buf) 0
1da177e4 LT	97	#define follow_huge_pmd(mm, addr, pmd, write) NULL
ceb86879	98	#define follow_huge_pud(mm, addr, pud, write) NULL
a5516438	99	#define prepare_hugepage_range(file, addr, len) (-EINVAL)
1da177e4	100	#define pmd_huge(x) 0
ceb86879	101	#define pud_huge(x) 0
1da177e4	102	#define is_hugepage_only_range(mm, addr, len) 0
9da61aef	103	#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
788c7df4	104	#define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; })
0fe6e20b	105	#define huge_pte_offset(mm, address) 0
6de2b1aa	106	#define dequeue_hwpoisoned_huge_page(page) 0
0ebabb41 NH	107	static inline void copy_huge_page(struct page dst, struct page src)
	108	{
	109	}
1da177e4	110
8f860591 ZY	111	#define hugetlb_change_protection(vma, address, end, newprot)
8f860591 ZY	112
1da177e4	113	#ifndef HPAGE_MASK
51c6f666 RH	114	#define HPAGE_MASK PAGE_MASK /* Keep the compiler happy */
51c6f666 RH	115	#define HPAGE_SIZE PAGE_SIZE
1da177e4 LT	116	#endif
	117
	118	#endif /* !CONFIG_HUGETLB_PAGE */
	119
4e52780d EM	120	#define HUGETLB_ANON_FILE "anon_hugepage"
4e52780d EM	121
6bfde05b EM	122	enum {
	123	/*
	124	* The file will be used as an shm file so shmfs accounting rules
	125	* apply
	126	*/
	127	HUGETLB_SHMFS_INODE = 1,
4e52780d EM	128	/*
	129	* The file is being created on the internal vfs mount and shmfs
	130	* accounting rules do not apply
	131	*/
	132	HUGETLB_ANONHUGE_INODE = 2,
6bfde05b EM	133	};
6bfde05b EM	134
1da177e4 LT	135	#ifdef CONFIG_HUGETLBFS
	136	struct hugetlbfs_config {
	137	uid_t uid;
	138	gid_t gid;
	139	umode_t mode;
	140	long nr_blocks;
	141	long nr_inodes;
a137e1cc	142	struct hstate *hstate;
1da177e4 LT	143	};
	144
	145	struct hugetlbfs_sb_info {
	146	long max_blocks; /* blocks allowed */
	147	long free_blocks; /* blocks free */
	148	long max_inodes; /* inodes allowed */
	149	long free_inodes; /* inodes free */
	150	spinlock_t stat_lock;
a137e1cc	151	struct hstate *hstate;
1da177e4 LT	152	};
	153
	154
	155	struct hugetlbfs_inode_info {
	156	struct shared_policy policy;
	157	struct inode vfs_inode;
	158	};
	159
	160	static inline struct hugetlbfs_inode_info HUGETLBFS_I(struct inode inode)
	161	{
	162	return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
	163	}
	164
	165	static inline struct hugetlbfs_sb_info HUGETLBFS_SB(struct super_block sb)
	166	{
	167	return sb->s_fs_info;
	168	}
	169
4b6f5d20	170	extern const struct file_operations hugetlbfs_file_operations;
f0f37e2f	171	extern const struct vm_operations_struct hugetlb_vm_ops;
ca16d140	172	struct file hugetlb_file_setup(const char name, size_t size, vm_flags_t acct,
6bfde05b	173	struct user_struct **user, int creat_flags);
9a119c05 AL	174	int hugetlb_get_quota(struct address_space *mapping, long delta);
9a119c05 AL	175	void hugetlb_put_quota(struct address_space *mapping, long delta);
1da177e4 LT	176
	177	static inline int is_file_hugepages(struct file *file)
	178	{
516dffdc AL	179	if (file->f_op == &hugetlbfs_file_operations)
	180	return 1;
	181	if (is_file_shm_hugepages(file))
	182	return 1;
	183
	184	return 0;
1da177e4 LT	185	}
	186
	187	static inline void set_file_hugepages(struct file *file)
	188	{
	189	file->f_op = &hugetlbfs_file_operations;
	190	}
	191	#else /* !CONFIG_HUGETLBFS */
	192
1db8508c SR	193	#define is_file_hugepages(file) 0
1db8508c SR	194	#define set_file_hugepages(file) BUG()
e9ea0e2d	195	static inline struct file hugetlb_file_setup(const char name, size_t size,
ca16d140	196	vm_flags_t acctflag, struct user_struct **user, int creat_flags)
e9ea0e2d AM	197	{
	198	return ERR_PTR(-ENOSYS);
	199	}
1da177e4 LT	200
	201	#endif /* !CONFIG_HUGETLBFS */
	202
d2ba27e8 AB	203	#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
	204	unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
	205	unsigned long len, unsigned long pgoff,
	206	unsigned long flags);
	207	#endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
	208
a5516438 AK	209	#ifdef CONFIG_HUGETLB_PAGE
a5516438 AK	210
a3437870	211	#define HSTATE_NAME_LEN 32
a5516438 AK	212	/* Defines one hugetlb page size */
a5516438 AK	213	struct hstate {
e8c5c824 LS	214	int next_nid_to_alloc;
e8c5c824 LS	215	int next_nid_to_free;
a5516438 AK	216	unsigned int order;
	217	unsigned long mask;
	218	unsigned long max_huge_pages;
	219	unsigned long nr_huge_pages;
	220	unsigned long free_huge_pages;
	221	unsigned long resv_huge_pages;
	222	unsigned long surplus_huge_pages;
	223	unsigned long nr_overcommit_huge_pages;
	224	struct list_head hugepage_freelists[MAX_NUMNODES];
	225	unsigned int nr_huge_pages_node[MAX_NUMNODES];
	226	unsigned int free_huge_pages_node[MAX_NUMNODES];
	227	unsigned int surplus_huge_pages_node[MAX_NUMNODES];
a3437870	228	char name[HSTATE_NAME_LEN];
a5516438 AK	229	};
a5516438 AK	230
53ba51d2 JT	231	struct huge_bootmem_page {
	232	struct list_head list;
	233	struct hstate *hstate;
ee8f248d BB	234	#ifdef CONFIG_HIGHMEM
	235	phys_addr_t phys;
	236	#endif
53ba51d2 JT	237	};
53ba51d2 JT	238
bf50bab2 NH	239	struct page alloc_huge_page_node(struct hstate h, int nid);
bf50bab2 NH	240
53ba51d2 JT	241	/* arch callback */
	242	int __init alloc_bootmem_huge_page(struct hstate *h);
	243
e5ff2159 AK	244	void __init hugetlb_add_hstate(unsigned order);
	245	struct hstate *size_to_hstate(unsigned long size);
	246
	247	#ifndef HUGE_MAX_HSTATE
	248	#define HUGE_MAX_HSTATE 1
	249	#endif
	250
	251	extern struct hstate hstates[HUGE_MAX_HSTATE];
	252	extern unsigned int default_hstate_idx;
	253
	254	#define default_hstate (hstates[default_hstate_idx])
a5516438	255
a137e1cc	256	static inline struct hstate hstate_inode(struct inode i)
a5516438	257	{
a137e1cc AK	258	struct hugetlbfs_sb_info *hsb;
	259	hsb = HUGETLBFS_SB(i->i_sb);
	260	return hsb->hstate;
a5516438 AK	261	}
	262
	263	static inline struct hstate hstate_file(struct file f)
	264	{
a137e1cc	265	return hstate_inode(f->f_dentry->d_inode);
a5516438 AK	266	}
a5516438 AK	267
a137e1cc	268	static inline struct hstate hstate_vma(struct vm_area_struct vma)
a5516438	269	{
a137e1cc	270	return hstate_file(vma->vm_file);
a5516438 AK	271	}
	272
	273	static inline unsigned long huge_page_size(struct hstate *h)
	274	{
	275	return (unsigned long)PAGE_SIZE << h->order;
	276	}
	277
08fba699 MG	278	extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
08fba699 MG	279
3340289d MG	280	extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
3340289d MG	281
a5516438 AK	282	static inline unsigned long huge_page_mask(struct hstate *h)
	283	{
	284	return h->mask;
	285	}
	286
	287	static inline unsigned int huge_page_order(struct hstate *h)
	288	{
	289	return h->order;
	290	}
	291
	292	static inline unsigned huge_page_shift(struct hstate *h)
	293	{
	294	return h->order + PAGE_SHIFT;
	295	}
	296
	297	static inline unsigned int pages_per_huge_page(struct hstate *h)
	298	{
	299	return 1 << h->order;
	300	}
	301
	302	static inline unsigned int blocks_per_huge_page(struct hstate *h)
	303	{
	304	return huge_page_size(h) / 512;
	305	}
	306
	307	#include <asm/hugetlb.h>
	308
e5ff2159 AK	309	static inline struct hstate page_hstate(struct page page)
	310	{
	311	return size_to_hstate(PAGE_SIZE << compound_order(page));
	312	}
	313
aa50d3a7 AK	314	static inline unsigned hstate_index_to_shift(unsigned index)
	315	{
	316	return hstates[index].order + PAGE_SHIFT;
	317	}
	318
a5516438 AK	319	#else
a5516438 AK	320	struct hstate {};
bf50bab2	321	#define alloc_huge_page_node(h, nid) NULL
53ba51d2	322	#define alloc_bootmem_huge_page(h) NULL
a5516438 AK	323	#define hstate_file(f) NULL
	324	#define hstate_vma(v) NULL
	325	#define hstate_inode(i) NULL
	326	#define huge_page_size(h) PAGE_SIZE
	327	#define huge_page_mask(h) PAGE_MASK
08fba699	328	#define vma_kernel_pagesize(v) PAGE_SIZE
3340289d	329	#define vma_mmu_pagesize(v) PAGE_SIZE
a5516438 AK	330	#define huge_page_order(h) 0
a5516438 AK	331	#define huge_page_shift(h) PAGE_SHIFT
510a35d4 AR	332	static inline unsigned int pages_per_huge_page(struct hstate *h)
	333	{
	334	return 1;
	335	}
aa50d3a7	336	#define hstate_index_to_shift(index) 0
a5516438 AK	337	#endif
a5516438 AK	338
1da177e4	339	#endif /* _LINUX_HUGETLB_H */