[linux-2.6-block.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>

struct ctl_table;

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

void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
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, 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 *);
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,
						struct vm_area_struct *vma);
void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);

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, 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);
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 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()
#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(file, 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);

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 */

#ifdef CONFIG_HUGETLB_PAGE

/* Defines one hugetlb page size */
struct hstate {
	int hugetlb_next_nid;
	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];
};

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_vma(struct vm_area_struct *vma)
{
	return &default_hstate;
}

static inline struct hstate *hstate_file(struct file *f)
{
	return &default_hstate;
}

static inline struct hstate *hstate_inode(struct inode *i)
{
	return &default_hstate;
}

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

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));
}

#else
struct hstate {};
#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 huge_page_order(h) 0
#define huge_page_shift(h) PAGE_SHIFT
#define pages_per_huge_page(h) 1
#endif

#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>
1da177e4 LT	11
	12	struct ctl_table;
	13
	14	static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
	15	{
	16	return vma->vm_flags & VM_HUGETLB;
	17	}
	18
a1e78772	19	void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
1da177e4	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);
04f2cbe3 MG	25	void unmap_hugepage_range(struct vm_area_struct *,
	26	unsigned long, unsigned long, struct page *);
	27	void __unmap_hugepage_range(struct vm_area_struct *,
	28	unsigned long, unsigned long, struct page *);
1da177e4 LT	29	int hugetlb_prefault(struct address_space , struct vm_area_struct );
	30	int hugetlb_report_meminfo(char *);
	31	int hugetlb_report_node_meminfo(int, char *);
1da177e4	32	unsigned long hugetlb_total_pages(void);
ac9b9c66 HD	33	int hugetlb_fault(struct mm_struct mm, struct vm_area_struct vma,
ac9b9c66 HD	34	unsigned long address, int write_access);
a1e78772 MG	35	int hugetlb_reserve_pages(struct inode *inode, long from, long to,
a1e78772 MG	36	struct vm_area_struct *vma);
a43a8c39	37	void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
1da177e4	38
396faf03	39	extern unsigned long hugepages_treat_as_movable;
1da177e4 LT	40	extern const unsigned long hugetlb_zero, hugetlb_infinity;
	41	extern int sysctl_hugetlb_shm_group;
	42
63551ae0 DG	43	/* arch callbacks */
63551ae0 DG	44
a5516438 AK	45	pte_t huge_pte_alloc(struct mm_struct mm,
a5516438 AK	46	unsigned long addr, unsigned long sz);
63551ae0	47	pte_t huge_pte_offset(struct mm_struct mm, unsigned long addr);
39dde65c	48	int huge_pmd_unshare(struct mm_struct mm, unsigned long addr, pte_t *ptep);
63551ae0 DG	49	struct page follow_huge_addr(struct mm_struct mm, unsigned long address,
	50	int write);
	51	struct page follow_huge_pmd(struct mm_struct mm, unsigned long address,
	52	pmd_t *pmd, int write);
63551ae0	53	int pmd_huge(pmd_t pmd);
8f860591 ZY	54	void hugetlb_change_protection(struct vm_area_struct *vma,
8f860591 ZY	55	unsigned long address, unsigned long end, pgprot_t newprot);
63551ae0	56
1da177e4 LT	57	#else /* !CONFIG_HUGETLB_PAGE */
	58
	59	static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
	60	{
	61	return 0;
	62	}
a1e78772 MG	63
	64	static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
	65	{
	66	}
	67
1da177e4 LT	68	static inline unsigned long hugetlb_total_pages(void)
	69	{
	70	return 0;
	71	}
	72
5b23dbe8	73	#define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; })
1da177e4 LT	74	#define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
	75	#define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
	76	#define hugetlb_prefault(mapping, vma) ({ BUG(); 0; })
04f2cbe3	77	#define unmap_hugepage_range(vma, start, end, page) BUG()
1da177e4 LT	78	#define hugetlb_report_meminfo(buf) 0
	79	#define hugetlb_report_node_meminfo(n, buf) 0
	80	#define follow_huge_pmd(mm, addr, pmd, write) NULL
a5516438	81	#define prepare_hugepage_range(file, addr, len) (-EINVAL)
1da177e4 LT	82	#define pmd_huge(x) 0
1da177e4 LT	83	#define is_hugepage_only_range(mm, addr, len) 0
9da61aef	84	#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
ac9b9c66	85	#define hugetlb_fault(mm, vma, addr, write) ({ BUG(); 0; })
1da177e4	86
8f860591 ZY	87	#define hugetlb_change_protection(vma, address, end, newprot)
8f860591 ZY	88
1da177e4	89	#ifndef HPAGE_MASK
51c6f666 RH	90	#define HPAGE_MASK PAGE_MASK /* Keep the compiler happy */
51c6f666 RH	91	#define HPAGE_SIZE PAGE_SIZE
1da177e4 LT	92	#endif
	93
	94	#endif /* !CONFIG_HUGETLB_PAGE */
	95
	96	#ifdef CONFIG_HUGETLBFS
	97	struct hugetlbfs_config {
	98	uid_t uid;
	99	gid_t gid;
	100	umode_t mode;
	101	long nr_blocks;
	102	long nr_inodes;
	103	};
	104
	105	struct hugetlbfs_sb_info {
	106	long max_blocks; /* blocks allowed */
	107	long free_blocks; /* blocks free */
	108	long max_inodes; /* inodes allowed */
	109	long free_inodes; /* inodes free */
	110	spinlock_t stat_lock;
	111	};
	112
	113
	114	struct hugetlbfs_inode_info {
	115	struct shared_policy policy;
	116	struct inode vfs_inode;
	117	};
	118
	119	static inline struct hugetlbfs_inode_info HUGETLBFS_I(struct inode inode)
	120	{
	121	return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
	122	}
	123
	124	static inline struct hugetlbfs_sb_info HUGETLBFS_SB(struct super_block sb)
	125	{
	126	return sb->s_fs_info;
	127	}
	128
4b6f5d20	129	extern const struct file_operations hugetlbfs_file_operations;
1da177e4	130	extern struct vm_operations_struct hugetlb_vm_ops;
9d66586f	131	struct file hugetlb_file_setup(const char name, size_t);
9a119c05 AL	132	int hugetlb_get_quota(struct address_space *mapping, long delta);
9a119c05 AL	133	void hugetlb_put_quota(struct address_space *mapping, long delta);
1da177e4 LT	134
	135	static inline int is_file_hugepages(struct file *file)
	136	{
516dffdc AL	137	if (file->f_op == &hugetlbfs_file_operations)
	138	return 1;
	139	if (is_file_shm_hugepages(file))
	140	return 1;
	141
	142	return 0;
1da177e4 LT	143	}
	144
	145	static inline void set_file_hugepages(struct file *file)
	146	{
	147	file->f_op = &hugetlbfs_file_operations;
	148	}
	149	#else /* !CONFIG_HUGETLBFS */
	150
	151	#define is_file_hugepages(file) 0
	152	#define set_file_hugepages(file) BUG()
9d66586f	153	#define hugetlb_file_setup(name,size) ERR_PTR(-ENOSYS)
1da177e4 LT	154
	155	#endif /* !CONFIG_HUGETLBFS */
	156
d2ba27e8 AB	157	#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
	158	unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
	159	unsigned long len, unsigned long pgoff,
	160	unsigned long flags);
	161	#endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
	162
a5516438 AK	163	#ifdef CONFIG_HUGETLB_PAGE
	164
	165	/* Defines one hugetlb page size */
	166	struct hstate {
	167	int hugetlb_next_nid;
	168	unsigned int order;
	169	unsigned long mask;
	170	unsigned long max_huge_pages;
	171	unsigned long nr_huge_pages;
	172	unsigned long free_huge_pages;
	173	unsigned long resv_huge_pages;
	174	unsigned long surplus_huge_pages;
	175	unsigned long nr_overcommit_huge_pages;
	176	struct list_head hugepage_freelists[MAX_NUMNODES];
	177	unsigned int nr_huge_pages_node[MAX_NUMNODES];
	178	unsigned int free_huge_pages_node[MAX_NUMNODES];
	179	unsigned int surplus_huge_pages_node[MAX_NUMNODES];
	180	};
	181
e5ff2159 AK	182	void __init hugetlb_add_hstate(unsigned order);
	183	struct hstate *size_to_hstate(unsigned long size);
	184
	185	#ifndef HUGE_MAX_HSTATE
	186	#define HUGE_MAX_HSTATE 1
	187	#endif
	188
	189	extern struct hstate hstates[HUGE_MAX_HSTATE];
	190	extern unsigned int default_hstate_idx;
	191
	192	#define default_hstate (hstates[default_hstate_idx])
a5516438 AK	193
	194	static inline struct hstate hstate_vma(struct vm_area_struct vma)
	195	{
	196	return &default_hstate;
	197	}
	198
	199	static inline struct hstate hstate_file(struct file f)
	200	{
	201	return &default_hstate;
	202	}
	203
	204	static inline struct hstate hstate_inode(struct inode i)
	205	{
	206	return &default_hstate;
	207	}
	208
	209	static inline unsigned long huge_page_size(struct hstate *h)
	210	{
	211	return (unsigned long)PAGE_SIZE << h->order;
	212	}
	213
	214	static inline unsigned long huge_page_mask(struct hstate *h)
	215	{
	216	return h->mask;
	217	}
	218
	219	static inline unsigned int huge_page_order(struct hstate *h)
	220	{
	221	return h->order;
	222	}
	223
	224	static inline unsigned huge_page_shift(struct hstate *h)
	225	{
	226	return h->order + PAGE_SHIFT;
	227	}
	228
	229	static inline unsigned int pages_per_huge_page(struct hstate *h)
	230	{
	231	return 1 << h->order;
	232	}
	233
	234	static inline unsigned int blocks_per_huge_page(struct hstate *h)
	235	{
	236	return huge_page_size(h) / 512;
	237	}
	238
	239	#include <asm/hugetlb.h>
	240
e5ff2159 AK	241	static inline struct hstate page_hstate(struct page page)
	242	{
	243	return size_to_hstate(PAGE_SIZE << compound_order(page));
	244	}
	245
a5516438 AK	246	#else
	247	struct hstate {};
	248	#define hstate_file(f) NULL
	249	#define hstate_vma(v) NULL
	250	#define hstate_inode(i) NULL
	251	#define huge_page_size(h) PAGE_SIZE
	252	#define huge_page_mask(h) PAGE_MASK
	253	#define huge_page_order(h) 0
	254	#define huge_page_shift(h) PAGE_SHIFT
	255	#define pages_per_huge_page(h) 1
	256	#endif
	257
1da177e4	258	#endif /* _LINUX_HUGETLB_H */