[deliverable/linux.git] / include / linux / dax.h

#ifndef _LINUX_DAX_H
#define _LINUX_DAX_H

#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/radix-tree.h>
#include <asm/pgtable.h>

/* We use lowest available exceptional entry bit for locking */
#define RADIX_DAX_ENTRY_LOCK (1 << RADIX_TREE_EXCEPTIONAL_SHIFT)

ssize_t dax_do_io(struct kiocb *, struct inode *, struct iov_iter *,
		  get_block_t, dio_iodone_t, int flags);
int dax_zero_page_range(struct inode *, loff_t from, unsigned len, get_block_t);
int dax_truncate_page(struct inode *, loff_t from, get_block_t);
int dax_fault(struct vm_area_struct *, struct vm_fault *, get_block_t);
int __dax_fault(struct vm_area_struct *, struct vm_fault *, get_block_t);
int dax_delete_mapping_entry(struct address_space *mapping, pgoff_t index);
void dax_wake_mapping_entry_waiter(struct address_space *mapping,
				   pgoff_t index, bool wake_all);

#ifdef CONFIG_FS_DAX
struct page *read_dax_sector(struct block_device *bdev, sector_t n);
void dax_unlock_mapping_entry(struct address_space *mapping, pgoff_t index);
int __dax_zero_page_range(struct block_device *bdev, sector_t sector,
		unsigned int offset, unsigned int length);
#else
static inline struct page *read_dax_sector(struct block_device *bdev,
		sector_t n)
{
	return ERR_PTR(-ENXIO);
}
/* Shouldn't ever be called when dax is disabled. */
static inline void dax_unlock_mapping_entry(struct address_space *mapping,
					    pgoff_t index)
{
	BUG();
}
static inline int __dax_zero_page_range(struct block_device *bdev,
		sector_t sector, unsigned int offset, unsigned int length)
{
	return -ENXIO;
}
#endif

#if defined(CONFIG_TRANSPARENT_HUGEPAGE)
int dax_pmd_fault(struct vm_area_struct *, unsigned long addr, pmd_t *,
				unsigned int flags, get_block_t);
int __dax_pmd_fault(struct vm_area_struct *, unsigned long addr, pmd_t *,
				unsigned int flags, get_block_t);
#else
static inline int dax_pmd_fault(struct vm_area_struct *vma, unsigned long addr,
				pmd_t *pmd, unsigned int flags, get_block_t gb)
{
	return VM_FAULT_FALLBACK;
}
#define __dax_pmd_fault dax_pmd_fault
#endif
int dax_pfn_mkwrite(struct vm_area_struct *, struct vm_fault *);
#define dax_mkwrite(vma, vmf, gb)	dax_fault(vma, vmf, gb)
#define __dax_mkwrite(vma, vmf, gb)	__dax_fault(vma, vmf, gb)

static inline bool vma_is_dax(struct vm_area_struct *vma)
{
	return vma->vm_file && IS_DAX(vma->vm_file->f_mapping->host);
}

static inline bool dax_mapping(struct address_space *mapping)
{
	return mapping->host && IS_DAX(mapping->host);
}

struct writeback_control;
int dax_writeback_mapping_range(struct address_space *mapping,
		struct block_device *bdev, struct writeback_control *wbc);
#endif
Commit	Line	Data
	1	#ifndef _LINUX_DAX_H
	2	#define _LINUX_DAX_H
	3
	4	#include <linux/fs.h>
	5	#include <linux/mm.h>
	6	#include <linux/radix-tree.h>
	7	#include <asm/pgtable.h>
	8
	9	/* We use lowest available exceptional entry bit for locking */
	10	#define RADIX_DAX_ENTRY_LOCK (1 << RADIX_TREE_EXCEPTIONAL_SHIFT)
	11
	12	ssize_t dax_do_io(struct kiocb , struct inode , struct iov_iter *,
	13	get_block_t, dio_iodone_t, int flags);
	14	int dax_zero_page_range(struct inode *, loff_t from, unsigned len, get_block_t);
	15	int dax_truncate_page(struct inode *, loff_t from, get_block_t);
	16	int dax_fault(struct vm_area_struct , struct vm_fault , get_block_t);
	17	int __dax_fault(struct vm_area_struct , struct vm_fault , get_block_t);
	18	int dax_delete_mapping_entry(struct address_space *mapping, pgoff_t index);
	19	void dax_wake_mapping_entry_waiter(struct address_space *mapping,
	20	pgoff_t index, bool wake_all);
	21
	22	#ifdef CONFIG_FS_DAX
	23	struct page read_dax_sector(struct block_device bdev, sector_t n);
	24	void dax_unlock_mapping_entry(struct address_space *mapping, pgoff_t index);
	25	int __dax_zero_page_range(struct block_device *bdev, sector_t sector,
	26	unsigned int offset, unsigned int length);
	27	#else
	28	static inline struct page read_dax_sector(struct block_device bdev,
	29	sector_t n)
	30	{
	31	return ERR_PTR(-ENXIO);
	32	}
	33	/* Shouldn't ever be called when dax is disabled. */
	34	static inline void dax_unlock_mapping_entry(struct address_space *mapping,
	35	pgoff_t index)
	36	{
	37	BUG();
	38	}
	39	static inline int __dax_zero_page_range(struct block_device *bdev,
	40	sector_t sector, unsigned int offset, unsigned int length)
	41	{
	42	return -ENXIO;
	43	}
	44	#endif
	45
	46	#if defined(CONFIG_TRANSPARENT_HUGEPAGE)
	47	int dax_pmd_fault(struct vm_area_struct , unsigned long addr, pmd_t ,
	48	unsigned int flags, get_block_t);
	49	int __dax_pmd_fault(struct vm_area_struct , unsigned long addr, pmd_t ,
	50	unsigned int flags, get_block_t);
	51	#else
	52	static inline int dax_pmd_fault(struct vm_area_struct *vma, unsigned long addr,
	53	pmd_t *pmd, unsigned int flags, get_block_t gb)
	54	{
	55	return VM_FAULT_FALLBACK;
	56	}
	57	#define __dax_pmd_fault dax_pmd_fault
	58	#endif
	59	int dax_pfn_mkwrite(struct vm_area_struct , struct vm_fault );
	60	#define dax_mkwrite(vma, vmf, gb) dax_fault(vma, vmf, gb)
	61	#define __dax_mkwrite(vma, vmf, gb) __dax_fault(vma, vmf, gb)
	62
	63	static inline bool vma_is_dax(struct vm_area_struct *vma)
	64	{
	65	return vma->vm_file && IS_DAX(vma->vm_file->f_mapping->host);
	66	}
	67
	68	static inline bool dax_mapping(struct address_space *mapping)
	69	{
	70	return mapping->host && IS_DAX(mapping->host);
	71	}
	72
	73	struct writeback_control;
	74	int dax_writeback_mapping_range(struct address_space *mapping,
	75	struct block_device bdev, struct writeback_control wbc);
	76	#endif