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

#ifndef _LINUX_HUGETLB_H
#define _LINUX_HUGETLB_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 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);
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 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,
						pgoff_t pgoff)
{
	if (pgoff & (~HPAGE_MASK >> PAGE_SHIFT))
		return -EINVAL;
	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,
						pgoff_t pgoff);
#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)	({ 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,pgoff)	(-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);
void hugetlb_put_quota(struct address_space *mapping);

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
	4	#ifdef CONFIG_HUGETLB_PAGE
	5
	6	#include <linux/mempolicy.h>
516dffdc	7	#include <linux/shm.h>
63551ae0	8	#include <asm/tlbflush.h>
1da177e4 LT	9
	10	struct ctl_table;
	11
	12	static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
	13	{
	14	return vma->vm_flags & VM_HUGETLB;
	15	}
	16
	17	int hugetlb_sysctl_handler(struct ctl_table , int, struct file , void __user , size_t , loff_t *);
	18	int copy_hugetlb_page_range(struct mm_struct , struct mm_struct , struct vm_area_struct *);
	19	int follow_hugetlb_page(struct mm_struct , struct vm_area_struct , struct page , struct vm_area_struct , unsigned long , int , int);
1da177e4	20	void unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
502717f4	21	void __unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
1da177e4 LT	22	int hugetlb_prefault(struct address_space , struct vm_area_struct );
	23	int hugetlb_report_meminfo(char *);
	24	int hugetlb_report_node_meminfo(int, char *);
1da177e4	25	unsigned long hugetlb_total_pages(void);
ac9b9c66 HD	26	int hugetlb_fault(struct mm_struct mm, struct vm_area_struct vma,
ac9b9c66 HD	27	unsigned long address, int write_access);
a43a8c39 CK	28	int hugetlb_reserve_pages(struct inode *inode, long from, long to);
a43a8c39 CK	29	void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
1da177e4 LT	30
	31	extern unsigned long max_huge_pages;
	32	extern const unsigned long hugetlb_zero, hugetlb_infinity;
	33	extern int sysctl_hugetlb_shm_group;
	34
63551ae0 DG	35	/* arch callbacks */
	36
	37	pte_t huge_pte_alloc(struct mm_struct mm, unsigned long addr);
	38	pte_t huge_pte_offset(struct mm_struct mm, unsigned long addr);
39dde65c	39	int huge_pmd_unshare(struct mm_struct mm, unsigned long addr, pte_t *ptep);
63551ae0 DG	40	struct page follow_huge_addr(struct mm_struct mm, unsigned long address,
	41	int write);
	42	struct page follow_huge_pmd(struct mm_struct mm, unsigned long address,
	43	pmd_t *pmd, int write);
63551ae0	44	int pmd_huge(pmd_t pmd);
8f860591 ZY	45	void hugetlb_change_protection(struct vm_area_struct *vma,
8f860591 ZY	46	unsigned long address, unsigned long end, pgprot_t newprot);
63551ae0	47
1da177e4 LT	48	#ifndef ARCH_HAS_HUGEPAGE_ONLY_RANGE
1da177e4 LT	49	#define is_hugepage_only_range(mm, addr, len) 0
9da61aef DG	50	#endif
	51
	52	#ifndef ARCH_HAS_HUGETLB_FREE_PGD_RANGE
	53	#define hugetlb_free_pgd_range free_pgd_range
3915bcf3 DG	54	#else
	55	void hugetlb_free_pgd_range(struct mmu_gather **tlb, unsigned long addr,
	56	unsigned long end, unsigned long floor,
	57	unsigned long ceiling);
1da177e4 LT	58	#endif
	59
	60	#ifndef ARCH_HAS_PREPARE_HUGEPAGE_RANGE
42b88bef DG	61	/*
	62	* If the arch doesn't supply something else, assume that hugepage
	63	* size aligned regions are ok without further preparation.
	64	*/
68589bc3 HD	65	static inline int prepare_hugepage_range(unsigned long addr, unsigned long len,
68589bc3 HD	66	pgoff_t pgoff)
42b88bef	67	{
68589bc3 HD	68	if (pgoff & (~HPAGE_MASK >> PAGE_SHIFT))
68589bc3 HD	69	return -EINVAL;
42b88bef DG	70	if (len & ~HPAGE_MASK)
	71	return -EINVAL;
	72	if (addr & ~HPAGE_MASK)
	73	return -EINVAL;
	74	return 0;
	75	}
1da177e4	76	#else
68589bc3 HD	77	int prepare_hugepage_range(unsigned long addr, unsigned long len,
68589bc3 HD	78	pgoff_t pgoff);
1da177e4 LT	79	#endif
1da177e4 LT	80
63551ae0 DG	81	#ifndef ARCH_HAS_SETCLEAR_HUGE_PTE
	82	#define set_huge_pte_at(mm, addr, ptep, pte) set_pte_at(mm, addr, ptep, pte)
	83	#define huge_ptep_get_and_clear(mm, addr, ptep) ptep_get_and_clear(mm, addr, ptep)
	84	#else
	85	void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
	86	pte_t *ptep, pte_t pte);
	87	pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
	88	pte_t *ptep);
	89	#endif
	90
	91	#ifndef ARCH_HAS_HUGETLB_PREFAULT_HOOK
	92	#define hugetlb_prefault_arch_hook(mm) do { } while (0)
	93	#else
	94	void hugetlb_prefault_arch_hook(struct mm_struct *mm);
	95	#endif
	96
1da177e4 LT	97	#else /* !CONFIG_HUGETLB_PAGE */
	98
	99	static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
	100	{
	101	return 0;
	102	}
	103	static inline unsigned long hugetlb_total_pages(void)
	104	{
	105	return 0;
	106	}
	107
	108	#define follow_hugetlb_page(m,v,p,vs,a,b,i) ({ BUG(); 0; })
	109	#define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
	110	#define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
	111	#define hugetlb_prefault(mapping, vma) ({ BUG(); 0; })
1da177e4	112	#define unmap_hugepage_range(vma, start, end) BUG()
1da177e4 LT	113	#define hugetlb_report_meminfo(buf) 0
	114	#define hugetlb_report_node_meminfo(n, buf) 0
	115	#define follow_huge_pmd(mm, addr, pmd, write) NULL
68589bc3	116	#define prepare_hugepage_range(addr,len,pgoff) (-EINVAL)
1da177e4 LT	117	#define pmd_huge(x) 0
1da177e4 LT	118	#define is_hugepage_only_range(mm, addr, len) 0
9da61aef	119	#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
ac9b9c66	120	#define hugetlb_fault(mm, vma, addr, write) ({ BUG(); 0; })
1da177e4	121
8f860591 ZY	122	#define hugetlb_change_protection(vma, address, end, newprot)
8f860591 ZY	123
1da177e4	124	#ifndef HPAGE_MASK
51c6f666 RH	125	#define HPAGE_MASK PAGE_MASK /* Keep the compiler happy */
51c6f666 RH	126	#define HPAGE_SIZE PAGE_SIZE
1da177e4 LT	127	#endif
	128
	129	#endif /* !CONFIG_HUGETLB_PAGE */
	130
	131	#ifdef CONFIG_HUGETLBFS
	132	struct hugetlbfs_config {
	133	uid_t uid;
	134	gid_t gid;
	135	umode_t mode;
	136	long nr_blocks;
	137	long nr_inodes;
	138	};
	139
	140	struct hugetlbfs_sb_info {
	141	long max_blocks; /* blocks allowed */
	142	long free_blocks; /* blocks free */
	143	long max_inodes; /* inodes allowed */
	144	long free_inodes; /* inodes free */
	145	spinlock_t stat_lock;
	146	};
	147
	148
	149	struct hugetlbfs_inode_info {
	150	struct shared_policy policy;
	151	struct inode vfs_inode;
	152	};
	153
	154	static inline struct hugetlbfs_inode_info HUGETLBFS_I(struct inode inode)
	155	{
	156	return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
	157	}
	158
	159	static inline struct hugetlbfs_sb_info HUGETLBFS_SB(struct super_block sb)
	160	{
	161	return sb->s_fs_info;
	162	}
	163
4b6f5d20	164	extern const struct file_operations hugetlbfs_file_operations;
1da177e4	165	extern struct vm_operations_struct hugetlb_vm_ops;
9d66586f	166	struct file hugetlb_file_setup(const char name, size_t);
1da177e4 LT	167	int hugetlb_get_quota(struct address_space *mapping);
	168	void hugetlb_put_quota(struct address_space *mapping);
	169
	170	static inline int is_file_hugepages(struct file *file)
	171	{
516dffdc AL	172	if (file->f_op == &hugetlbfs_file_operations)
	173	return 1;
	174	if (is_file_shm_hugepages(file))
	175	return 1;
	176
	177	return 0;
1da177e4 LT	178	}
	179
	180	static inline void set_file_hugepages(struct file *file)
	181	{
	182	file->f_op = &hugetlbfs_file_operations;
	183	}
	184	#else /* !CONFIG_HUGETLBFS */
	185
	186	#define is_file_hugepages(file) 0
	187	#define set_file_hugepages(file) BUG()
9d66586f	188	#define hugetlb_file_setup(name,size) ERR_PTR(-ENOSYS)
1da177e4 LT	189
	190	#endif /* !CONFIG_HUGETLBFS */
	191
d2ba27e8 AB	192	#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
	193	unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
	194	unsigned long len, unsigned long pgoff,
	195	unsigned long flags);
	196	#endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
	197
1da177e4	198	#endif /* _LINUX_HUGETLB_H */