LXR linux/include/linux/dax.h

   1#ifndef _LINUX_DAX_H
   2#define _LINUX_DAX_H
   3
   4#include <linux/fs.h>
   5#include <linux/mm.h>
   6#include <asm/pgtable.h>
   7
   8ssize_t dax_do_io(struct kiocb *, struct inode *, struct iov_iter *, loff_t,
   9                  get_block_t, dio_iodone_t, int flags);
  10int dax_clear_sectors(struct block_device *bdev, sector_t _sector, long _size);
  11int dax_zero_page_range(struct inode *, loff_t from, unsigned len, get_block_t);
  12int dax_truncate_page(struct inode *, loff_t from, get_block_t);
  13int dax_fault(struct vm_area_struct *, struct vm_fault *, get_block_t,
  14                dax_iodone_t);
  15int __dax_fault(struct vm_area_struct *, struct vm_fault *, get_block_t,
  16                dax_iodone_t);
  17
  18#ifdef CONFIG_FS_DAX
  19struct page *read_dax_sector(struct block_device *bdev, sector_t n);
  20#else
  21static inline struct page *read_dax_sector(struct block_device *bdev,
  22                sector_t n)
  23{
  24        return ERR_PTR(-ENXIO);
  25}
  26#endif
  27
  28#ifdef CONFIG_TRANSPARENT_HUGEPAGE
  29int dax_pmd_fault(struct vm_area_struct *, unsigned long addr, pmd_t *,
  30                                unsigned int flags, get_block_t, dax_iodone_t);
  31int __dax_pmd_fault(struct vm_area_struct *, unsigned long addr, pmd_t *,
  32                                unsigned int flags, get_block_t, dax_iodone_t);
  33#else
  34static inline int dax_pmd_fault(struct vm_area_struct *vma, unsigned long addr,
  35                                pmd_t *pmd, unsigned int flags, get_block_t gb,
  36                                dax_iodone_t di)
  37{
  38        return VM_FAULT_FALLBACK;
  39}
  40#define __dax_pmd_fault dax_pmd_fault
  41#endif
  42int dax_pfn_mkwrite(struct vm_area_struct *, struct vm_fault *);
  43#define dax_mkwrite(vma, vmf, gb, iod)          dax_fault(vma, vmf, gb, iod)
  44#define __dax_mkwrite(vma, vmf, gb, iod)        __dax_fault(vma, vmf, gb, iod)
  45
  46static inline bool vma_is_dax(struct vm_area_struct *vma)
  47{
  48        return vma->vm_file && IS_DAX(vma->vm_file->f_mapping->host);
  49}
  50
  51static inline bool dax_mapping(struct address_space *mapping)
  52{
  53        return mapping->host && IS_DAX(mapping->host);
  54}
  55
  56struct writeback_control;
  57int dax_writeback_mapping_range(struct address_space *mapping,
  58                struct block_device *bdev, struct writeback_control *wbc);
  59#endif
  60