[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;
}

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);

#ifndef ARCH_HAS_HUGEPAGE_ONLY_RANGE
#define is_hugepage_only_range(mm, addr, len)	0
#endif

#ifndef ARCH_HAS_HUGETLB_FREE_PGD_RANGE
#define hugetlb_free_pgd_range	free_pgd_range
#else
void hugetlb_free_pgd_range(struct mmu_gather **tlb, unsigned long addr,
			    unsigned long end, unsigned long floor,
			    unsigned long ceiling);
#endif

#ifndef ARCH_HAS_PREPARE_HUGEPAGE_RANGE
/*
 * If the arch doesn't supply something else, assume that hugepage
 * size aligned regions are ok without further preparation.
 */
static inline int prepare_hugepage_range(unsigned long addr, unsigned long len)
{
	if (len & ~HPAGE_MASK)
		return -EINVAL;
	if (addr & ~HPAGE_MASK)
		return -EINVAL;
	return 0;
}
#else
int prepare_hugepage_range(unsigned long addr, unsigned long len);
#endif

#ifndef ARCH_HAS_SETCLEAR_HUGE_PTE
#define set_huge_pte_at(mm, addr, ptep, pte)	set_pte_at(mm, addr, ptep, pte)
#define huge_ptep_get_and_clear(mm, addr, ptep) ptep_get_and_clear(mm, addr, ptep)
#else
void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
		     pte_t *ptep, pte_t pte);
pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
			      pte_t *ptep);
#endif

#ifndef ARCH_HAS_HUGETLB_PREFAULT_HOOK
#define hugetlb_prefault_arch_hook(mm)		do { } while (0)
#else
void hugetlb_prefault_arch_hook(struct mm_struct *mm);
#endif

#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>
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
	19	int hugetlb_sysctl_handler(struct ctl_table , int, struct file , void __user , size_t , loff_t *);
a3d0c6aa	20	int hugetlb_overcommit_handler(struct ctl_table , int, struct file , void __user , size_t , loff_t *);
396faf03	21	int hugetlb_treat_movable_handler(struct ctl_table , int, struct file , void __user , size_t , loff_t *);
1da177e4	22	int copy_hugetlb_page_range(struct mm_struct , struct mm_struct , struct vm_area_struct *);
5b23dbe8	23	int follow_hugetlb_page(struct mm_struct , struct vm_area_struct , struct page , struct vm_area_struct , unsigned long , int , int, int);
1da177e4	24	void unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
502717f4	25	void __unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
1da177e4 LT	26	int hugetlb_prefault(struct address_space , struct vm_area_struct );
	27	int hugetlb_report_meminfo(char *);
	28	int hugetlb_report_node_meminfo(int, char *);
1da177e4	29	unsigned long hugetlb_total_pages(void);
ac9b9c66 HD	30	int hugetlb_fault(struct mm_struct mm, struct vm_area_struct vma,
ac9b9c66 HD	31	unsigned long address, int write_access);
a43a8c39 CK	32	int hugetlb_reserve_pages(struct inode *inode, long from, long to);
a43a8c39 CK	33	void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
1da177e4 LT	34
1da177e4 LT	35	extern unsigned long max_huge_pages;
064d9efe	36	extern unsigned long sysctl_overcommit_huge_pages;
396faf03	37	extern unsigned long hugepages_treat_as_movable;
1da177e4 LT	38	extern const unsigned long hugetlb_zero, hugetlb_infinity;
	39	extern int sysctl_hugetlb_shm_group;
	40
63551ae0 DG	41	/* arch callbacks */
	42
	43	pte_t huge_pte_alloc(struct mm_struct mm, unsigned long addr);
	44	pte_t huge_pte_offset(struct mm_struct mm, unsigned long addr);
39dde65c	45	int huge_pmd_unshare(struct mm_struct mm, unsigned long addr, pte_t *ptep);
63551ae0 DG	46	struct page follow_huge_addr(struct mm_struct mm, unsigned long address,
	47	int write);
	48	struct page follow_huge_pmd(struct mm_struct mm, unsigned long address,
	49	pmd_t *pmd, int write);
63551ae0	50	int pmd_huge(pmd_t pmd);
8f860591 ZY	51	void hugetlb_change_protection(struct vm_area_struct *vma,
8f860591 ZY	52	unsigned long address, unsigned long end, pgprot_t newprot);
63551ae0	53
1da177e4 LT	54	#ifndef ARCH_HAS_HUGEPAGE_ONLY_RANGE
1da177e4 LT	55	#define is_hugepage_only_range(mm, addr, len) 0
9da61aef DG	56	#endif
	57
	58	#ifndef ARCH_HAS_HUGETLB_FREE_PGD_RANGE
	59	#define hugetlb_free_pgd_range free_pgd_range
3915bcf3 DG	60	#else
	61	void hugetlb_free_pgd_range(struct mmu_gather **tlb, unsigned long addr,
	62	unsigned long end, unsigned long floor,
	63	unsigned long ceiling);
1da177e4 LT	64	#endif
	65
	66	#ifndef ARCH_HAS_PREPARE_HUGEPAGE_RANGE
42b88bef DG	67	/*
	68	* If the arch doesn't supply something else, assume that hugepage
	69	* size aligned regions are ok without further preparation.
	70	*/
dec4ad86	71	static inline int prepare_hugepage_range(unsigned long addr, unsigned long len)
42b88bef DG	72	{
	73	if (len & ~HPAGE_MASK)
	74	return -EINVAL;
	75	if (addr & ~HPAGE_MASK)
	76	return -EINVAL;
	77	return 0;
	78	}
1da177e4	79	#else
dec4ad86	80	int prepare_hugepage_range(unsigned long addr, unsigned long len);
1da177e4 LT	81	#endif
1da177e4 LT	82
63551ae0 DG	83	#ifndef ARCH_HAS_SETCLEAR_HUGE_PTE
	84	#define set_huge_pte_at(mm, addr, ptep, pte) set_pte_at(mm, addr, ptep, pte)
	85	#define huge_ptep_get_and_clear(mm, addr, ptep) ptep_get_and_clear(mm, addr, ptep)
	86	#else
	87	void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
	88	pte_t *ptep, pte_t pte);
	89	pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
	90	pte_t *ptep);
	91	#endif
	92
	93	#ifndef ARCH_HAS_HUGETLB_PREFAULT_HOOK
	94	#define hugetlb_prefault_arch_hook(mm) do { } while (0)
	95	#else
	96	void hugetlb_prefault_arch_hook(struct mm_struct *mm);
	97	#endif
	98
1da177e4 LT	99	#else /* !CONFIG_HUGETLB_PAGE */
	100
	101	static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
	102	{
	103	return 0;
	104	}
	105	static inline unsigned long hugetlb_total_pages(void)
	106	{
	107	return 0;
	108	}
	109
5b23dbe8	110	#define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; })
1da177e4 LT	111	#define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
	112	#define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
	113	#define hugetlb_prefault(mapping, vma) ({ BUG(); 0; })
1da177e4	114	#define unmap_hugepage_range(vma, start, end) BUG()
1da177e4 LT	115	#define hugetlb_report_meminfo(buf) 0
	116	#define hugetlb_report_node_meminfo(n, buf) 0
	117	#define follow_huge_pmd(mm, addr, pmd, write) NULL
dec4ad86	118	#define prepare_hugepage_range(addr,len) (-EINVAL)
1da177e4 LT	119	#define pmd_huge(x) 0
1da177e4 LT	120	#define is_hugepage_only_range(mm, addr, len) 0
9da61aef	121	#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
ac9b9c66	122	#define hugetlb_fault(mm, vma, addr, write) ({ BUG(); 0; })
1da177e4	123
8f860591 ZY	124	#define hugetlb_change_protection(vma, address, end, newprot)
8f860591 ZY	125
1da177e4	126	#ifndef HPAGE_MASK
51c6f666 RH	127	#define HPAGE_MASK PAGE_MASK /* Keep the compiler happy */
51c6f666 RH	128	#define HPAGE_SIZE PAGE_SIZE
1da177e4 LT	129	#endif
	130
	131	#endif /* !CONFIG_HUGETLB_PAGE */
	132
	133	#ifdef CONFIG_HUGETLBFS
	134	struct hugetlbfs_config {
	135	uid_t uid;
	136	gid_t gid;
	137	umode_t mode;
	138	long nr_blocks;
	139	long nr_inodes;
	140	};
	141
	142	struct hugetlbfs_sb_info {
	143	long max_blocks; /* blocks allowed */
	144	long free_blocks; /* blocks free */
	145	long max_inodes; /* inodes allowed */
	146	long free_inodes; /* inodes free */
	147	spinlock_t stat_lock;
	148	};
	149
	150
	151	struct hugetlbfs_inode_info {
	152	struct shared_policy policy;
	153	struct inode vfs_inode;
	154	};
	155
	156	static inline struct hugetlbfs_inode_info HUGETLBFS_I(struct inode inode)
	157	{
	158	return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
	159	}
	160
	161	static inline struct hugetlbfs_sb_info HUGETLBFS_SB(struct super_block sb)
	162	{
	163	return sb->s_fs_info;
	164	}
	165
4b6f5d20	166	extern const struct file_operations hugetlbfs_file_operations;
1da177e4	167	extern struct vm_operations_struct hugetlb_vm_ops;
9d66586f	168	struct file hugetlb_file_setup(const char name, size_t);
9a119c05 AL	169	int hugetlb_get_quota(struct address_space *mapping, long delta);
9a119c05 AL	170	void hugetlb_put_quota(struct address_space *mapping, long delta);
1da177e4	171
45c682a6 KC	172	#define BLOCKS_PER_HUGEPAGE (HPAGE_SIZE / 512)
45c682a6 KC	173
1da177e4 LT	174	static inline int is_file_hugepages(struct file *file)
1da177e4 LT	175	{
516dffdc AL	176	if (file->f_op == &hugetlbfs_file_operations)
	177	return 1;
	178	if (is_file_shm_hugepages(file))
	179	return 1;
	180
	181	return 0;
1da177e4 LT	182	}
	183
	184	static inline void set_file_hugepages(struct file *file)
	185	{
	186	file->f_op = &hugetlbfs_file_operations;
	187	}
	188	#else /* !CONFIG_HUGETLBFS */
	189
	190	#define is_file_hugepages(file) 0
	191	#define set_file_hugepages(file) BUG()
9d66586f	192	#define hugetlb_file_setup(name,size) ERR_PTR(-ENOSYS)
1da177e4 LT	193
	194	#endif /* !CONFIG_HUGETLBFS */
	195
d2ba27e8 AB	196	#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
	197	unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
	198	unsigned long len, unsigned long pgoff,
	199	unsigned long flags);
	200	#endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
	201
1da177e4	202	#endif /* _LINUX_HUGETLB_H */