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
   8 ssize_t dax_do_io(struct kiocb *, struct inode *, struct iov_iter *, loff_t,
   9                   get_block_t, dio_iodone_t, int flags);
  10 int dax_clear_blocks(struct inode *, sector_t block, long size);
  11 int dax_zero_page_range(struct inode *, loff_t from, unsigned len, get_block_t);
  12 int dax_truncate_page(struct inode *, loff_t from, get_block_t);
  13 int dax_fault(struct vm_area_struct *, struct vm_fault *, get_block_t,
  14                 dax_iodone_t);
  15 int __dax_fault(struct vm_area_struct *, struct vm_fault *, get_block_t,
  16                 dax_iodone_t);
  17
  18 #ifdef CONFIG_FS_DAX
  19 struct page *read_dax_sector(struct block_device *bdev, sector_t n);
  20 #else
  21 static 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
  29 int dax_pmd_fault(struct vm_area_struct *, unsigned long addr, pmd_t *,
  30                                 unsigned int flags, get_block_t, dax_iodone_t);
  31 int __dax_pmd_fault(struct vm_area_struct *, unsigned long addr, pmd_t *,
  32                                 unsigned int flags, get_block_t, dax_iodone_t);
  33 #else
  34 static 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
  42 int 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
  46 static 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
  51 static inline bool dax_mapping(struct address_space *mapping)
  52 {
  53         return mapping->host && IS_DAX(mapping->host);
  54 }
  55 int dax_writeback_mapping_range(struct address_space *mapping, loff_t start,
  56                 loff_t end);
  57 #endif